libiptc.c revision 380ba5f3074a16fbaa8869d9594962d58b5f8608
1380ba5f3074a16fbaa8869d9594962d58b5f8608Harald Welte/* Library which manipulates firewall rules. Version $Revision: 1.33 $ */ 2e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 3e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Architecture of firewall rules is as follows: 4e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * 5e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Chains go INPUT, FORWARD, OUTPUT then user chains. 6e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Each user chain starts with an ERROR node. 7e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Every chain ends with an unconditional jump: a RETURN for user chains, 8e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * and a POLICY for built-ins. 9e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher */ 10e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 11e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* (C)1999 Paul ``Rusty'' Russell - Placed under the GNU GPL (See 12e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher COPYING for details). */ 13e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 14e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#ifndef IPT_LIB_DIR 15e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#define IPT_LIB_DIR "/usr/local/lib/iptables" 16e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#endif 17e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 184e242f822ef0add1359c540ed0cf3acdf74c63f3Rusty Russell#ifndef __OPTIMIZE__ 19ec81ca7e5e5939eb0bfa4776c5c0c585efdfd1bbHarald WelteSTRUCT_ENTRY_TARGET * 2079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellGET_TARGET(STRUCT_ENTRY *e) 2130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 2230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return (void *)e + e->target_offset; 2330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell} 2430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell#endif 2530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 26e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int sockfd = -1; 27e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void *iptc_fn = NULL; 28e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 29e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic const char *hooknames[] 3079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell= { [HOOK_PRE_ROUTING] "PREROUTING", 3179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell [HOOK_LOCAL_IN] "INPUT", 3279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell [HOOK_FORWARD] "FORWARD", 3379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell [HOOK_LOCAL_OUT] "OUTPUT", 3410758b743d6aa076ebe2c3e8f855e73826841e71Rusty Russell [HOOK_POST_ROUTING] "POSTROUTING", 3510758b743d6aa076ebe2c3e8f855e73826841e71Rusty Russell#ifdef HOOK_DROPPING 3610758b743d6aa076ebe2c3e8f855e73826841e71Rusty Russell [HOOK_DROPPING] "DROPPING" 3710758b743d6aa076ebe2c3e8f855e73826841e71Rusty Russell#endif 38e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 39e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 40e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstruct counter_map 41e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 42e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher enum { 43e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher COUNTER_MAP_NOMAP, 44e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher COUNTER_MAP_NORMAL_MAP, 451cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte COUNTER_MAP_ZEROED, 461cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte COUNTER_MAP_SET 47e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } maptype; 48e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int mappos; 49e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 50e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 51e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Convenience structures */ 52e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstruct ipt_error_target 53e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 5479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET t; 5579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell char error[TABLE_MAXNAMELEN]; 56e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 57e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 5830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russellstruct chain_cache 5930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 6079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell char name[TABLE_MAXNAMELEN]; 6130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* This is the first rule in chain. */ 6279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *start; 6330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* Last rule in chain */ 6479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *end; 6530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell}; 6630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 6779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellSTRUCT_TC_HANDLE 68e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 69e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Have changes been made? */ 70e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int changed; 71e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Size in here reflects original state. */ 7279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_GETINFO info; 73e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 74e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct counter_map *counter_map; 75e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Array of hook names */ 76e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher const char **hooknames; 77e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 7830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* Cached position of chain heads (NULL = no cache). */ 7930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int cache_num_chains; 8030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int cache_num_builtins; 8130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *cache_chain_heads; 8230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 8330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* Chain iterator: current chain cache entry. */ 8430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *cache_chain_iteration; 8530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 8630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* Rule iterator: terminal rule */ 8779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *cache_rule_end; 88175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell 89e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Number in here reflects current state. */ 90e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int new_number; 9179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_GET_ENTRIES entries; 92e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 93e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 94175f64177743e5a417e98d483ef995bf7151f3bcRusty Russellstatic void 9579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellset_changed(TC_HANDLE_T h) 96175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell{ 9730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (h->cache_chain_heads) { 9830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell free(h->cache_chain_heads); 9930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads = NULL; 10030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_chains = 0; 10130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_iteration = NULL; 10230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_rule_end = NULL; 10330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell } 104175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell h->changed = 1; 105175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell} 106175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell 107380ba5f3074a16fbaa8869d9594962d58b5f8608Harald Welte#ifdef IPTC_DEBUG 10879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstatic void do_check(TC_HANDLE_T h, unsigned int line); 109849779c4adf8dd65c83fffb65e6b7898df2a55c6Rusty Russell#define CHECK(h) do { if (!getenv("IPTC_NO_CHECK")) do_check((h), __LINE__); } while(0) 11030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell#else 11130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell#define CHECK(h) 11230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell#endif 113e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 114e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic inline int 11579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellget_number(const STRUCT_ENTRY *i, 11679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY *seek, 117e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int *pos) 118e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 119e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (i == seek) 120e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 121e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*pos)++; 122e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 123e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 124e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 125e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic unsigned int 12679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellentry2index(const TC_HANDLE_T h, const STRUCT_ENTRY *seek) 127e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 128e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int pos = 0; 129e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 130725d97a79cf0b332ed45cb7d254915178328427dRusty Russell if (ENTRY_ITERATE(h->entries.entrytable, h->entries.size, 13179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell get_number, seek, &pos) == 0) { 132e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher fprintf(stderr, "ERROR: offset %i not an entry!\n", 133725d97a79cf0b332ed45cb7d254915178328427dRusty Russell (char *)seek - (char *)h->entries.entrytable); 134e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher abort(); 135e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 136e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return pos; 137e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 138e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 139e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic inline int 14079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellget_entry_n(STRUCT_ENTRY *i, 141e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int number, 142e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int *pos, 14379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY **pe) 144e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 145e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (*pos == number) { 146e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *pe = i; 147e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 148e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 149e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*pos)++; 150e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 151e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 152e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 15379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstatic STRUCT_ENTRY * 15479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellindex2entry(TC_HANDLE_T h, unsigned int index) 155e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 156e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int pos = 0; 15779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *ret = NULL; 158e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 159725d97a79cf0b332ed45cb7d254915178328427dRusty Russell ENTRY_ITERATE(h->entries.entrytable, h->entries.size, 16079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell get_entry_n, index, &pos, &ret); 161e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 162e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 163e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 164e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 16579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstatic inline STRUCT_ENTRY * 16679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellget_entry(TC_HANDLE_T h, unsigned int offset) 167e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 168725d97a79cf0b332ed45cb7d254915178328427dRusty Russell return (STRUCT_ENTRY *)((char *)h->entries.entrytable + offset); 169e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 170e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 171e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic inline unsigned long 17279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellentry2offset(const TC_HANDLE_T h, const STRUCT_ENTRY *e) 173e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 174725d97a79cf0b332ed45cb7d254915178328427dRusty Russell return (char *)e - (char *)h->entries.entrytable; 175e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 176e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 177e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic unsigned long 17879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellindex2offset(TC_HANDLE_T h, unsigned int index) 179e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 180e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return entry2offset(h, index2entry(h, index)); 181e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 182e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 183e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic const char * 18479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellget_errorlabel(TC_HANDLE_T h, unsigned int offset) 185e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 18679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e; 187e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 188e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher e = get_entry(h, offset); 18967088e73ce7707229c56987868f112051defca5aRusty Russell if (strcmp(GET_TARGET(e)->u.user.name, ERROR_TARGET) != 0) { 190e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher fprintf(stderr, "ERROR: offset %u not an error node!\n", 191e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher offset); 192e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher abort(); 193e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 194e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 19579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell return (const char *)GET_TARGET(e)->data; 196e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 197e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 198e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Allocate handle of given size */ 19979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstatic TC_HANDLE_T 200e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucheralloc_handle(const char *tablename, unsigned int size, unsigned int num_rules) 201e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 202e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher size_t len; 20379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T h; 204e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 20579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell len = sizeof(STRUCT_TC_HANDLE) 206e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher + size 207e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher + num_rules * sizeof(struct counter_map); 208e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 209e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((h = malloc(len)) == NULL) { 210e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOMEM; 211e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 212e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 213e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 214e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->changed = 0; 21530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_chains = 0; 21630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads = NULL; 217e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->counter_map = (void *)h 21879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell + sizeof(STRUCT_TC_HANDLE) 219e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher + size; 220e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher strcpy(h->info.name, tablename); 221e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher strcpy(h->entries.name, tablename); 222e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 223e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return h; 224e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 225e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 22679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_HANDLE_T 22779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_INIT(const char *tablename) 228e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 22979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T h; 23079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_GETINFO info; 231e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 232e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int tmp; 233e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher socklen_t s; 234e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 23579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_INIT; 236e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 237366454bc69f781fdafc3a30eb6dd77155ee4efb6Harald Welte if (sockfd != -1) 238366454bc69f781fdafc3a30eb6dd77155ee4efb6Harald Welte close(sockfd); 239366454bc69f781fdafc3a30eb6dd77155ee4efb6Harald Welte 24079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell sockfd = socket(TC_AF, SOCK_RAW, IPPROTO_RAW); 241e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (sockfd < 0) 242e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 243e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 244e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher s = sizeof(info); 24579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (strlen(tablename) >= TABLE_MAXNAMELEN) { 246e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 247e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 248e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 249e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher strcpy(info.name, tablename); 25079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (getsockopt(sockfd, TC_IPPROTO, SO_GET_INFO, &info, &s) < 0) 251e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 252e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 253e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((h = alloc_handle(info.name, info.size, info.num_entries)) 254e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher == NULL) 255e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 256e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 257e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Too hard --RR */ 258e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#if 0 259e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher sprintf(pathname, "%s/%s", IPT_LIB_DIR, info.name); 260e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dynlib = dlopen(pathname, RTLD_NOW); 261e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!dynlib) { 262e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 263e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 264e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 265e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->hooknames = dlsym(dynlib, "hooknames"); 266e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!h->hooknames) { 267e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 268e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 269e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 270e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#else 271e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->hooknames = hooknames; 272e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#endif 273e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 274e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Initialize current state */ 275e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->info = info; 276e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->new_number = h->info.num_entries; 277e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < h->info.num_entries; i++) 278e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->counter_map[i] 279e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher = ((struct counter_map){COUNTER_MAP_NORMAL_MAP, i}); 280e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 281e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher h->entries.size = h->info.size; 282e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 28379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell tmp = sizeof(STRUCT_GET_ENTRIES) + h->info.size; 284e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 28579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (getsockopt(sockfd, TC_IPPROTO, SO_GET_ENTRIES, &h->entries, 286e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher &tmp) < 0) { 287e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(h); 288e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 289e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 2907e53bf9c2a697abdb6f1385557338423a86612a3Rusty Russell 291e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher CHECK(h); 292e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return h; 293e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 294e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 295e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic inline int 29679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellprint_match(const STRUCT_ENTRY_MATCH *m) 297e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 298228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell printf("Match name: `%s'\n", m->u.user.name); 299e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 300e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 301e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 30279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstatic int dump_entry(STRUCT_ENTRY *e, const TC_HANDLE_T handle); 30379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell 304e6869a8f59d779ff4d5a0984c86d80db7078496Marc Bouchervoid 30579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_DUMP_ENTRIES(const TC_HANDLE_T handle) 306e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 307e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher CHECK(handle); 308e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 309e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("libiptc v%s. %u entries, %u bytes.\n", 310e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher NETFILTER_VERSION, 311e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher handle->new_number, handle->entries.size); 312e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("Table `%s'\n", handle->info.name); 313e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("Hooks: pre/in/fwd/out/post = %u/%u/%u/%u/%u\n", 31467088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.hook_entry[HOOK_PRE_ROUTING], 31567088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.hook_entry[HOOK_LOCAL_IN], 31667088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.hook_entry[HOOK_FORWARD], 31767088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.hook_entry[HOOK_LOCAL_OUT], 31867088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.hook_entry[HOOK_POST_ROUTING]); 319e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("Underflows: pre/in/fwd/out/post = %u/%u/%u/%u/%u\n", 32067088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.underflow[HOOK_PRE_ROUTING], 32167088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.underflow[HOOK_LOCAL_IN], 32267088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.underflow[HOOK_FORWARD], 32367088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.underflow[HOOK_LOCAL_OUT], 32467088e73ce7707229c56987868f112051defca5aRusty Russell handle->info.underflow[HOOK_POST_ROUTING]); 325e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 326725d97a79cf0b332ed45cb7d254915178328427dRusty Russell ENTRY_ITERATE(handle->entries.entrytable, handle->entries.size, 32779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell dump_entry, handle); 328e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 329e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 33030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell/* Returns 0 if not hook entry, else hooknumber + 1 */ 33130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russellstatic inline unsigned int 33279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellis_hook_entry(STRUCT_ENTRY *e, TC_HANDLE_T h) 33330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 33430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int i; 33530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 33679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell for (i = 0; i < NUMHOOKS; i++) { 33730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if ((h->info.valid_hooks & (1 << i)) 33830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell && get_entry(h, h->info.hook_entry[i]) == e) 33930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return i+1; 34030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell } 34130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return 0; 34230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell} 34330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 344e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic inline int 34579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russelladd_chain(STRUCT_ENTRY *e, TC_HANDLE_T h, STRUCT_ENTRY **prev) 346e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 34730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int builtin; 348e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 34930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* Last entry. End it. */ 35030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (entry2offset(h, e) + e->next_offset == h->entries.size) { 35130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* This is the ERROR node at end of the table */ 35230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads[h->cache_num_chains-1].end = *prev; 35330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return 0; 35430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell } 355e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 35630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* We know this is the start of a new chain if it's an ERROR 35730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell target, or a hook entry point */ 35867088e73ce7707229c56987868f112051defca5aRusty Russell if (strcmp(GET_TARGET(e)->u.user.name, ERROR_TARGET) == 0) { 35930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* prev was last entry in previous chain */ 36030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads[h->cache_num_chains-1].end 36130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell = *prev; 36230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 36330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell strcpy(h->cache_chain_heads[h->cache_num_chains].name, 36479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell (const char *)GET_TARGET(e)->data); 36530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads[h->cache_num_chains].start 36630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell = (void *)e + e->next_offset; 36730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_chains++; 36830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell } else if ((builtin = is_hook_entry(e, h)) != 0) { 36930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (h->cache_num_chains > 0) 37030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* prev was last entry in previous chain */ 37130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads[h->cache_num_chains-1].end 37230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell = *prev; 37330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 37430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell strcpy(h->cache_chain_heads[h->cache_num_chains].name, 37530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->hooknames[builtin-1]); 37630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads[h->cache_num_chains].start 37730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell = (void *)e; 37830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_chains++; 37930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell } 38030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 38130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell *prev = e; 382e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 383e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 384e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 38530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russellstatic int alphasort(const void *a, const void *b) 38630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 38730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return strcmp(((struct chain_cache *)a)->name, 38830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell ((struct chain_cache *)b)->name); 38930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell} 39030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 39179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstatic int populate_cache(TC_HANDLE_T h) 392e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 393e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 39479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *prev; 395e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 39630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* # chains < # rules / 2 + num builtins - 1 */ 39730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_chain_heads = malloc((h->new_number / 2 + 4) 39830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell * sizeof(struct chain_cache)); 39930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!h->cache_chain_heads) { 40030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell errno = ENOMEM; 40130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return 0; 402175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell } 403175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell 40430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_chains = 0; 40530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_builtins = 0; 40630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 40730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* Count builtins */ 40879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell for (i = 0; i < NUMHOOKS; i++) { 40930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (h->info.valid_hooks & (1 << i)) 41030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_builtins++; 411e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 412e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 41330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell prev = NULL; 414725d97a79cf0b332ed45cb7d254915178328427dRusty Russell ENTRY_ITERATE(h->entries.entrytable, h->entries.size, 41579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell add_chain, h, &prev); 41630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 41730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell qsort(h->cache_chain_heads + h->cache_num_builtins, 41830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell h->cache_num_chains - h->cache_num_builtins, 41930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell sizeof(struct chain_cache), alphasort); 42030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 42130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return 1; 42230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell} 42330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 42430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell/* Returns cache ptr if found, otherwise NULL. */ 42530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russellstatic struct chain_cache * 42679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellfind_label(const char *name, TC_HANDLE_T handle) 42730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 428849779c4adf8dd65c83fffb65e6b7898df2a55c6Rusty Russell unsigned int i; 42930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 43030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (handle->cache_chain_heads == NULL 43130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell && !populate_cache(handle)) 43230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return NULL; 43330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 434849779c4adf8dd65c83fffb65e6b7898df2a55c6Rusty Russell /* FIXME: Linear search through builtins, then binary --RR */ 435849779c4adf8dd65c83fffb65e6b7898df2a55c6Rusty Russell for (i = 0; i < handle->cache_num_chains; i++) { 436849779c4adf8dd65c83fffb65e6b7898df2a55c6Rusty Russell if (strcmp(handle->cache_chain_heads[i].name, name) == 0) 437849779c4adf8dd65c83fffb65e6b7898df2a55c6Rusty Russell return &handle->cache_chain_heads[i]; 438e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 439e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 440849779c4adf8dd65c83fffb65e6b7898df2a55c6Rusty Russell return NULL; 441e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 442e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 443e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Does this chain exist? */ 44479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellint TC_IS_CHAIN(const char *chain, const TC_HANDLE_T handle) 445e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 44630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return find_label(chain, handle) != NULL; 447e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 448e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 449e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Returns the position of the final (ie. unconditional) element. */ 450e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic unsigned int 45179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellget_chain_end(const TC_HANDLE_T handle, unsigned int start) 452e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 453e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int last_off, off; 45479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e; 455e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 456e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher last_off = start; 457e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher e = get_entry(handle, start); 458e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 459e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Terminate when we meet a error label or a hook entry. */ 460e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (off = start + e->next_offset; 461e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher off < handle->entries.size; 462e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher last_off = off, off += e->next_offset) { 46379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET *t; 464e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 465e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 466e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher e = get_entry(handle, off); 467e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 468e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* We hit an entry point. */ 46979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell for (i = 0; i < NUMHOOKS; i++) { 470e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((handle->info.valid_hooks & (1 << i)) 471e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher && off == handle->info.hook_entry[i]) 472e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return last_off; 473e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 474e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 475e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* We hit a user chain label */ 47679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell t = GET_TARGET(e); 47767088e73ce7707229c56987868f112051defca5aRusty Russell if (strcmp(t->u.user.name, ERROR_TARGET) == 0) 478e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return last_off; 479e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 480e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* SHOULD NEVER HAPPEN */ 481e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher fprintf(stderr, "ERROR: Off end (%u) of chain from %u!\n", 482e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher handle->entries.size, off); 483e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher abort(); 484e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 485e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 48630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell/* Iterator functions to run through the chains. */ 487e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherconst char * 4888c700900e2a0cf87d7917cb62578583a60ad1210Philip BlundellTC_FIRST_CHAIN(TC_HANDLE_T *handle) 489e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 49030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if ((*handle)->cache_chain_heads == NULL 49130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell && !populate_cache(*handle)) 492e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 493e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 49430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell (*handle)->cache_chain_iteration 49530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell = &(*handle)->cache_chain_heads[0]; 49630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 49730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return (*handle)->cache_chain_iteration->name; 49830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell} 49930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 50030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell/* Iterator functions to run through the chains. Returns NULL at end. */ 50130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russellconst char * 50279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_NEXT_CHAIN(TC_HANDLE_T *handle) 50330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 50430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell (*handle)->cache_chain_iteration++; 50530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 50630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if ((*handle)->cache_chain_iteration - (*handle)->cache_chain_heads 50730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell == (*handle)->cache_num_chains) 50830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return NULL; 50930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 51030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return (*handle)->cache_chain_iteration->name; 51130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell} 51230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 51330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell/* Get first rule in the given chain: NULL for empty chain. */ 51479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellconst STRUCT_ENTRY * 5158c700900e2a0cf87d7917cb62578583a60ad1210Philip BlundellTC_FIRST_RULE(const char *chain, TC_HANDLE_T *handle) 51630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 51730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 51830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 51930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell c = find_label(chain, *handle); 52030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!c) { 52130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell errno = ENOENT; 52230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return NULL; 523e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 524e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 52530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* Empty chain: single return/policy rule */ 52630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (c->start == c->end) 52730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return NULL; 52830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 52930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell (*handle)->cache_rule_end = c->end; 53030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return c->start; 531e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 532e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 53330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell/* Returns NULL when rules run out. */ 53479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellconst STRUCT_ENTRY * 5358c700900e2a0cf87d7917cb62578583a60ad1210Philip BlundellTC_NEXT_RULE(const STRUCT_ENTRY *prev, TC_HANDLE_T *handle) 53630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell{ 53730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if ((void *)prev + prev->next_offset 53830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell == (void *)(*handle)->cache_rule_end) 53930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return NULL; 54030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 54130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return (void *)prev + prev->next_offset; 54230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell} 54330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 54430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell#if 0 545e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* How many rules in this chain? */ 546e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherunsigned int 54779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_NUM_RULES(const char *chain, TC_HANDLE_T *handle) 548e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 549e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int off = 0; 55079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *start, *end; 551e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 552e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher CHECK(*handle); 553e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!find_label(&off, chain, *handle)) { 554e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 555e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return (unsigned int)-1; 556e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 557e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 558e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher start = get_entry(*handle, off); 559e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher end = get_entry(*handle, get_chain_end(*handle, off)); 560e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 561e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return entry2index(*handle, end) - entry2index(*handle, start); 562e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 563e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 564e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Get n'th rule in this chain. */ 56579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellconst STRUCT_ENTRY *TC_GET_RULE(const char *chain, 56679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unsigned int n, 56779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 568e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 569e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int pos = 0, chainindex; 570e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 571e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher CHECK(*handle); 572e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!find_label(&pos, chain, *handle)) { 573e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 574e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 575e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 576e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 577e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher chainindex = entry2index(*handle, get_entry(*handle, pos)); 578e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 579e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return index2entry(*handle, chainindex + n); 580e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 58130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell#endif 582e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 58330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russellstatic const char * 58479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russelltarget_name(TC_HANDLE_T handle, const STRUCT_ENTRY *ce) 585e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 586e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int spos; 587e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int labelidx; 58879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *jumpto; 589e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 59030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell /* To avoid const warnings */ 59179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e = (STRUCT_ENTRY *)ce; 59230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell 59379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (strcmp(GET_TARGET(e)->u.user.name, STANDARD_TARGET) != 0) 59479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell return GET_TARGET(e)->u.user.name; 595e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 596e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Standard target: evaluate */ 59779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell spos = *(int *)GET_TARGET(e)->data; 598e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (spos < 0) { 59979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (spos == RETURN) 60079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell return LABEL_RETURN; 601e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else if (spos == -NF_ACCEPT-1) 60279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell return LABEL_ACCEPT; 603e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else if (spos == -NF_DROP-1) 60479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell return LABEL_DROP; 6052f4e5d92c73906e0dc2ae42fee5c05740528e92bJames Morris else if (spos == -NF_QUEUE-1) 60667088e73ce7707229c56987868f112051defca5aRusty Russell return LABEL_QUEUE; 607e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 608e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher fprintf(stderr, "ERROR: off %lu/%u not a valid target (%i)\n", 609e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher entry2offset(handle, e), handle->entries.size, 610e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher spos); 611e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher abort(); 612e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 613e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 614e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher jumpto = get_entry(handle, spos); 615e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 616e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Fall through rule */ 617e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (jumpto == (void *)e + e->next_offset) 618e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ""; 619e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 620e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Must point to head of a chain: ie. after error rule */ 621e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher labelidx = entry2index(handle, jumpto) - 1; 622e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return get_errorlabel(handle, index2offset(handle, labelidx)); 623e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 624e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 625e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Returns a pointer to the target name of this position. */ 62679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellconst char *TC_GET_TARGET(const STRUCT_ENTRY *e, 62779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 628e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 629e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return target_name(*handle, e); 630e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 631e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 632e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Is this a built-in chain? Actually returns hook + 1. */ 633e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 63479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_BUILTIN(const char *chain, const TC_HANDLE_T handle) 635e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 636e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 637e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 63879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell for (i = 0; i < NUMHOOKS; i++) { 639e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((handle->info.valid_hooks & (1 << i)) 640e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher && handle->hooknames[i] 641e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher && strcmp(handle->hooknames[i], chain) == 0) 642e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return i+1; 643e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 644e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 645e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 646e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 647e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Get the policy of a given built-in chain */ 648e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherconst char * 64979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_GET_POLICY(const char *chain, 65079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_COUNTERS *counters, 65179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 652e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 653e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int start; 65479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e; 655e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int hook; 656e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 65779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell hook = TC_BUILTIN(chain, *handle); 658e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (hook != 0) 659e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher start = (*handle)->info.hook_entry[hook-1]; 660e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else 661e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 662e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 663e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher e = get_entry(*handle, get_chain_end(*handle, start)); 664e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *counters = e->counters; 665e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 666e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return target_name(*handle, e); 667e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 668e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 669e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 67079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellcorrect_verdict(STRUCT_ENTRY *e, 671725d97a79cf0b332ed45cb7d254915178328427dRusty Russell char *base, 672e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int offset, int delta_offset) 673e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 67479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_STANDARD_TARGET *t = (void *)GET_TARGET(e); 675725d97a79cf0b332ed45cb7d254915178328427dRusty Russell unsigned int curr = (char *)e - base; 676e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 677e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Trap: insert of fall-through rule. Don't change fall-through 678e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher verdict to jump-over-next-rule. */ 67979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (strcmp(t->target.u.user.name, STANDARD_TARGET) == 0 680e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher && t->verdict > (int)offset 681e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher && !(curr == offset && 682e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher t->verdict == curr + e->next_offset)) { 683e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher t->verdict += delta_offset; 684e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 685e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 686e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 687e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 688e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 689e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Adjusts standard verdict jump positions after an insertion/deletion. */ 690e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 69179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellset_verdict(unsigned int offset, int delta_offset, TC_HANDLE_T *handle) 692e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 693725d97a79cf0b332ed45cb7d254915178328427dRusty Russell ENTRY_ITERATE((*handle)->entries.entrytable, 69479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell (*handle)->entries.size, 695725d97a79cf0b332ed45cb7d254915178328427dRusty Russell correct_verdict, (char *)(*handle)->entries.entrytable, 69679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell offset, delta_offset); 697e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 698175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell set_changed(*handle); 699e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 700e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 701e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 702e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* If prepend is set, then we are prepending to a chain: if the 703e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * insertion position is an entry point, keep the entry point. */ 704e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 705e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherinsert_rules(unsigned int num_rules, unsigned int rules_size, 70679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY *insert, 707e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int offset, unsigned int num_rules_offset, 708e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int prepend, 70979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 710e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 71179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T newh; 71279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_GETINFO newinfo; 713e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 714e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 715e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (offset >= (*handle)->entries.size) { 716e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 717e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 718e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 719e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 720e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newinfo = (*handle)->info; 721e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 722e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Fix up entry points. */ 72379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell for (i = 0; i < NUMHOOKS; i++) { 724e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Entry points to START of chain, so keep same if 725e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher inserting on at that point. */ 726e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((*handle)->info.hook_entry[i] > offset) 727e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newinfo.hook_entry[i] += rules_size; 728e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 729e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Underflow always points to END of chain (policy), 730e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher so if something is inserted at same point, it 731e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher should be advanced. */ 732e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((*handle)->info.underflow[i] >= offset) 733e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newinfo.underflow[i] += rules_size; 734e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 735e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 736e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newh = alloc_handle((*handle)->info.name, 7373c7a6c479f3eccd65a78dc103f33f4085e8e4703Rusty Russell (*handle)->entries.size + rules_size, 7381de804642d4c8e9c71b7e225a1528fff15fa7faaHarald Welte (*handle)->new_number + num_rules); 739e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!newh) 740e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 741e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newh->info = newinfo; 742e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 743e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Copy pre... */ 744725d97a79cf0b332ed45cb7d254915178328427dRusty Russell memcpy(newh->entries.entrytable, (*handle)->entries.entrytable,offset); 745e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* ... Insert new ... */ 746725d97a79cf0b332ed45cb7d254915178328427dRusty Russell memcpy((char *)newh->entries.entrytable + offset, insert, rules_size); 747e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* ... copy post */ 748725d97a79cf0b332ed45cb7d254915178328427dRusty Russell memcpy((char *)newh->entries.entrytable + offset + rules_size, 749725d97a79cf0b332ed45cb7d254915178328427dRusty Russell (char *)(*handle)->entries.entrytable + offset, 750e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->entries.size - offset); 751e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 752e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Move counter map. */ 753e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Copy pre... */ 754e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memcpy(newh->counter_map, (*handle)->counter_map, 755e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher sizeof(struct counter_map) * num_rules_offset); 756e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* ... copy post */ 757e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memcpy(newh->counter_map + num_rules_offset + num_rules, 758e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->counter_map + num_rules_offset, 759e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher sizeof(struct counter_map) * ((*handle)->new_number 760e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher - num_rules_offset)); 761e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Set intermediates to no counter copy */ 762e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < num_rules; i++) 763e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newh->counter_map[num_rules_offset+i] 764e0072945b57dc499327567640648050563b19a5eHarald Welte = ((struct counter_map){ COUNTER_MAP_SET, 0 }); 765e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 766e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newh->new_number = (*handle)->new_number + num_rules; 767e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newh->entries.size = (*handle)->entries.size + rules_size; 768e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newh->hooknames = (*handle)->hooknames; 769e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 77030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if ((*handle)->cache_chain_heads) 77130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell free((*handle)->cache_chain_heads); 772e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(*handle); 773e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *handle = newh; 774e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 775e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return set_verdict(offset, rules_size, handle); 776e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 777e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 778e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 779e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherdelete_rules(unsigned int num_rules, unsigned int rules_size, 780e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int offset, unsigned int num_rules_offset, 78179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 782e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 783e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 784e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 785e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (offset + rules_size > (*handle)->entries.size) { 786e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 787e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 788e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 789e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 790e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Fix up entry points. */ 79179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell for (i = 0; i < NUMHOOKS; i++) { 792e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* In practice, we never delete up to a hook entry, 793e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher since the built-in chains are always first, 794e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher so these two are never equal */ 795e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((*handle)->info.hook_entry[i] >= offset + rules_size) 796e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->info.hook_entry[i] -= rules_size; 797e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else if ((*handle)->info.hook_entry[i] > offset) { 798e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher fprintf(stderr, "ERROR: Deleting entry %u %u %u\n", 799e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher i, (*handle)->info.hook_entry[i], offset); 800e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher abort(); 801e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 802e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 803e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Underflow points to policy (terminal) rule in 804e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher built-in, so sequality is valid here (when deleting 805e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher the last rule). */ 806e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((*handle)->info.underflow[i] >= offset + rules_size) 807e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->info.underflow[i] -= rules_size; 808e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else if ((*handle)->info.underflow[i] > offset) { 809e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher fprintf(stderr, "ERROR: Deleting uflow %u %u %u\n", 810e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher i, (*handle)->info.underflow[i], offset); 811e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher abort(); 812e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 813e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 814e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 815e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Move the rules down. */ 816725d97a79cf0b332ed45cb7d254915178328427dRusty Russell memmove((char *)(*handle)->entries.entrytable + offset, 817725d97a79cf0b332ed45cb7d254915178328427dRusty Russell (char *)(*handle)->entries.entrytable + offset + rules_size, 818e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->entries.size - (offset + rules_size)); 819e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 820e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Move the counter map down. */ 821e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memmove(&(*handle)->counter_map[num_rules_offset], 822e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher &(*handle)->counter_map[num_rules_offset + num_rules], 823e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher sizeof(struct counter_map) 824e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * ((*handle)->new_number - (num_rules + num_rules_offset))); 825e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 826e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Fix numbers */ 827e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->new_number -= num_rules; 828e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->entries.size -= rules_size; 829e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 830e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return set_verdict(offset, -(int)rules_size, handle); 831e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 832e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 833e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 83479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstandard_map(STRUCT_ENTRY *e, int verdict) 835e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 83679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_STANDARD_TARGET *t; 837e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 83879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell t = (STRUCT_STANDARD_TARGET *)GET_TARGET(e); 839e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 84067088e73ce7707229c56987868f112051defca5aRusty Russell if (t->target.u.target_size 8418c700900e2a0cf87d7917cb62578583a60ad1210Philip Blundell != ALIGN(sizeof(STRUCT_STANDARD_TARGET))) { 842e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 843e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 844e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 845e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* memset for memcmp convenience on delete/replace */ 84679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell memset(t->target.u.user.name, 0, FUNCTION_MAXNAMELEN); 84779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell strcpy(t->target.u.user.name, STANDARD_TARGET); 848e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher t->verdict = verdict; 849e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 850e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 851e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 8527e53bf9c2a697abdb6f1385557338423a86612a3Rusty Russell 853e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 85479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellmap_target(const TC_HANDLE_T handle, 85579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e, 856e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int offset, 85779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET *old) 858e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 85979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET *t = GET_TARGET(e); 860e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 861e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Save old target (except data, which we don't change, except for 862e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher standard case, where we don't care). */ 863e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *old = *t; 864e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 865e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Maybe it's empty (=> fall through) */ 866228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell if (strcmp(t->u.user.name, "") == 0) 867e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return standard_map(e, offset + e->next_offset); 868e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Maybe it's a standard target name... */ 86979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell else if (strcmp(t->u.user.name, LABEL_ACCEPT) == 0) 870e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return standard_map(e, -NF_ACCEPT - 1); 87179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell else if (strcmp(t->u.user.name, LABEL_DROP) == 0) 872e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return standard_map(e, -NF_DROP - 1); 87367088e73ce7707229c56987868f112051defca5aRusty Russell else if (strcmp(t->u.user.name, LABEL_QUEUE) == 0) 874e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return standard_map(e, -NF_QUEUE - 1); 87579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell else if (strcmp(t->u.user.name, LABEL_RETURN) == 0) 87679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell return standard_map(e, RETURN); 87779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell else if (TC_BUILTIN(t->u.user.name, handle)) { 878e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Can't jump to builtins. */ 879e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 880e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 881e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else { 882e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Maybe it's an existing chain name. */ 88330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 884e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 885228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell c = find_label(t->u.user.name, handle); 88630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (c) 88730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell return standard_map(e, entry2offset(handle, c->start)); 888e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 889e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 890e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Must be a module? If not, kernel will reject... */ 891e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* memset to all 0 for your memcmp convenience. */ 892228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell memset(t->u.user.name + strlen(t->u.user.name), 893e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 0, 89479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell FUNCTION_MAXNAMELEN - strlen(t->u.user.name)); 895e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 896e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 897e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 898e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void 89979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellunmap_target(STRUCT_ENTRY *e, STRUCT_ENTRY_TARGET *old) 900e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 90179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET *t = GET_TARGET(e); 902e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 903e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Save old target (except data, which we don't change, except for 904e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher standard case, where we don't care). */ 905e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *t = *old; 906e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 907e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 908e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Insert the entry `fw' in chain `chain' into position `rulenum'. */ 909e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 91079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_INSERT_ENTRY(const IPT_CHAINLABEL chain, 91179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY *e, 91279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unsigned int rulenum, 91379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 914e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 91530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int chainindex, offset; 91679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET old; 91730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 91814a1c9175257f73e936a68ba68d3541278c0e52aRusty Russell STRUCT_ENTRY *tmp; 919e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 920e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 92179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_INSERT_ENTRY; 92230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 923e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 924e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 925e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 926e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 92730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell chainindex = entry2index(*handle, c->start); 928e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 92914a1c9175257f73e936a68ba68d3541278c0e52aRusty Russell tmp = index2entry(*handle, chainindex + rulenum); 93014a1c9175257f73e936a68ba68d3541278c0e52aRusty Russell if (!tmp || tmp > c->end) { 931e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = E2BIG; 932e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 933e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 934e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher offset = index2offset(*handle, chainindex + rulenum); 935e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 936e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Mapping target actually alters entry, but that's 937e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher transparent to the caller. */ 93879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (!map_target(*handle, (STRUCT_ENTRY *)e, offset, &old)) 939e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 940e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 941e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ret = insert_rules(1, e->next_offset, e, offset, 942e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher chainindex + rulenum, rulenum == 0, handle); 94379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unmap_target((STRUCT_ENTRY *)e, &old); 944e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 945e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 946e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 947e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Atomically replace rule `rulenum' in `chain' with `fw'. */ 948e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 94979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_REPLACE_ENTRY(const IPT_CHAINLABEL chain, 95079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY *e, 95179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unsigned int rulenum, 95279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 953e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 95430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int chainindex, offset; 95579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET old; 95630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 95714a1c9175257f73e936a68ba68d3541278c0e52aRusty Russell STRUCT_ENTRY *tmp; 958e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 959e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 96079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_REPLACE_ENTRY; 961e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 96230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 963e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 964e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 965e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 966e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 96730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell chainindex = entry2index(*handle, c->start); 968e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 96914a1c9175257f73e936a68ba68d3541278c0e52aRusty Russell tmp = index2entry(*handle, chainindex + rulenum); 97014a1c9175257f73e936a68ba68d3541278c0e52aRusty Russell if (!tmp || tmp >= c->end) { 971e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = E2BIG; 972e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 973e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 974e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 975e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher offset = index2offset(*handle, chainindex + rulenum); 976e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Replace = delete and insert. */ 977e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!delete_rules(1, get_entry(*handle, offset)->next_offset, 978e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher offset, chainindex + rulenum, handle)) 979e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 980e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 98179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (!map_target(*handle, (STRUCT_ENTRY *)e, offset, &old)) 982e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 983e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 984e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ret = insert_rules(1, e->next_offset, e, offset, 985e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher chainindex + rulenum, 1, handle); 98679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unmap_target((STRUCT_ENTRY *)e, &old); 987e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 988e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 989e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 990e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Append entry `fw' to chain `chain'. Equivalent to insert with 991e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher rulenum = length of chain. */ 992e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 99379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_APPEND_ENTRY(const IPT_CHAINLABEL chain, 99479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY *e, 99579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 996e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 99730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 99879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET old; 999e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 1000e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 100179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_APPEND_ENTRY; 100230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 1003e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1004e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1005e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1006e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 100779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (!map_target(*handle, (STRUCT_ENTRY *)e, 100830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell entry2offset(*handle, c->end), &old)) 1009e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1010e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 101130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell ret = insert_rules(1, e->next_offset, e, 101230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell entry2offset(*handle, c->end), 101330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell entry2index(*handle, c->end), 1014e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 0, handle); 101579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unmap_target((STRUCT_ENTRY *)e, &old); 1016e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 1017e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1018e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1019e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic inline int 102079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellmatch_different(const STRUCT_ENTRY_MATCH *a, 1021edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell const unsigned char *a_elems, 1022edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell const unsigned char *b_elems, 1023edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell unsigned char **maskptr) 1024e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 102579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY_MATCH *b; 1026edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell unsigned int i; 1027e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1028e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Offset of b is the same as a. */ 102930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell b = (void *)b_elems + ((unsigned char *)a - a_elems); 1030e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1031228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell if (a->u.match_size != b->u.match_size) 1032e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 1033e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1034228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell if (strcmp(a->u.user.name, b->u.user.name) != 0) 1035e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 1036e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 103773ef09b21573ddb17ff75e5fd06fd4b52ec8ea40Rusty Russell *maskptr += ALIGN(sizeof(*a)); 1038edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell 103973ef09b21573ddb17ff75e5fd06fd4b52ec8ea40Rusty Russell for (i = 0; i < a->u.match_size - ALIGN(sizeof(*a)); i++) 1040edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell if (((a->data[i] ^ b->data[i]) & (*maskptr)[i]) != 0) 1041edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell return 1; 1042edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell *maskptr += i; 1043edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell return 0; 1044edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell} 1045edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell 1046edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russellstatic inline int 1047edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russelltarget_different(const unsigned char *a_targdata, 1048edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell const unsigned char *b_targdata, 1049edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell unsigned int tdatasize, 1050edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell const unsigned char *mask) 1051edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell{ 1052edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell unsigned int i; 1053edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell for (i = 0; i < tdatasize; i++) 1054edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell if (((a_targdata[i] ^ b_targdata[i]) & mask[i]) != 0) 105590e712a00913fe2a2f885142439c392392dc08a8Rusty Russell return 1; 1056e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1057e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1058e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1059e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 106079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellstatic int 106179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellis_same(const STRUCT_ENTRY *a, 106279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY *b, 106379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unsigned char *matchmask); 1064e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1065e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Delete the first rule in `chain' which matches `fw'. */ 1066e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 106779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_DELETE_ENTRY(const IPT_CHAINLABEL chain, 106879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_ENTRY *origfw, 106979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unsigned char *matchmask, 107079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 1071e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 107230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int offset; 107330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 107479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e, *fw; 1075e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 107679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_DELETE_ENTRY; 107730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 1078e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1079e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1080e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1081e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1082e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher fw = malloc(origfw->next_offset); 1083e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (fw == NULL) { 1084e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOMEM; 1085e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1086e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1087e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 108830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell for (offset = entry2offset(*handle, c->start); 108930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell offset < entry2offset(*handle, c->end); 109030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell offset += e->next_offset) { 109179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY_TARGET discard; 1092e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1093e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memcpy(fw, origfw, origfw->next_offset); 1094e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1095e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* FIXME: handle this in is_same --RR */ 1096e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!map_target(*handle, fw, offset, &discard)) { 1097e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(fw); 1098e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1099e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1100e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher e = get_entry(*handle, offset); 1101e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1102e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#if 0 1103e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("Deleting:\n"); 1104e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dump_entry(newe); 1105e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#endif 1106edf14cf4b5edb148d7473f067d95e7bd1316900bRusty Russell if (is_same(e, fw, matchmask)) { 1107e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 1108e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ret = delete_rules(1, e->next_offset, 1109e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher offset, entry2index(*handle, e), 1110e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher handle); 1111e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(fw); 1112e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 1113e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1114e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1115e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1116e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(fw); 1117e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1118e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 11197e53bf9c2a697abdb6f1385557338423a86612a3Rusty Russell} 1120e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1121e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Delete the rule in position `rulenum' in `chain'. */ 1122e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 112379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_DELETE_NUM_ENTRY(const IPT_CHAINLABEL chain, 112479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell unsigned int rulenum, 112579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 1126e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1127e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int index; 1128e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 112979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e; 113030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 1131e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 113279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_DELETE_NUM_ENTRY; 113330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 1134e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1135e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1136e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1137e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 113830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell index = entry2index(*handle, c->start) + rulenum; 1139e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 114030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (index >= entry2index(*handle, c->end)) { 1141e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = E2BIG; 1142e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1143e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1144e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1145e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher e = index2entry(*handle, index); 1146e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (e == NULL) { 1147e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 1148e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1149e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1150e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1151e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ret = delete_rules(1, e->next_offset, entry2offset(*handle, e), 1152e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher index, handle); 1153e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 1154e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1155e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1156e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Check the packet `fw' on chain `chain'. Returns the verdict, or 1157e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher NULL and sets errno. */ 1158e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherconst char * 115979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_CHECK_PACKET(const IPT_CHAINLABEL chain, 116079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *entry, 116179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 1162e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1163e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOSYS; 1164e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return NULL; 1165e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1166e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1167e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Flushes the entries in the given chain (ie. empties chain). */ 1168e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 116979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_FLUSH_ENTRIES(const IPT_CHAINLABEL chain, TC_HANDLE_T *handle) 1170e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 117130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int startindex, endindex; 117230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 1173e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 1174e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 117579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_FLUSH_ENTRIES; 117630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 1177e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1178e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1179e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 118030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell startindex = entry2index(*handle, c->start); 118130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell endindex = entry2index(*handle, c->end); 1182e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1183e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ret = delete_rules(endindex - startindex, 118430fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell (char *)c->end - (char *)c->start, 118530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell entry2offset(*handle, c->start), startindex, 1186e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher handle); 1187e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 1188e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1189e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1190e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Zeroes the counters in a chain. */ 1191e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 119279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_ZERO_ENTRIES(const IPT_CHAINLABEL chain, TC_HANDLE_T *handle) 1193e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1194e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i, end; 119530fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 11967e53bf9c2a697abdb6f1385557338423a86612a3Rusty Russell 119730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 1198e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1199e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1200e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1201e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 120230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell i = entry2index(*handle, c->start); 120330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell end = entry2index(*handle, c->end); 1204e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1205e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (; i <= end; i++) { 1206e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((*handle)->counter_map[i].maptype ==COUNTER_MAP_NORMAL_MAP) 1207e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->counter_map[i].maptype = COUNTER_MAP_ZEROED; 1208e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1209175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell set_changed(*handle); 1210e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1211e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 1212e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1213e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 12141cef74d943055668b5e356eebea877fdaa1ce3e0Harald WelteSTRUCT_COUNTERS * 12151cef74d943055668b5e356eebea877fdaa1ce3e0Harald WelteTC_READ_COUNTER(const IPT_CHAINLABEL chain, 12161cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte unsigned int rulenum, 12171cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte TC_HANDLE_T *handle) 12181cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte{ 12191cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte STRUCT_ENTRY *e; 12201cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte struct chain_cache *c; 12211cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte unsigned int chainindex, end; 12221cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12231cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte iptc_fn = TC_READ_COUNTER; 12241cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte CHECK(*handle); 12251cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12261cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if (!(c = find_label(chain, *handle))) { 12271cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte errno = ENOENT; 12281cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return NULL; 12291cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 12301cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12311cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte chainindex = entry2index(*handle, c->start); 12321cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte end = entry2index(*handle, c->end); 12331cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12341cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if (chainindex + rulenum > end) { 12351cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte errno = E2BIG; 12361cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return NULL; 12371cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 12381cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12391cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte e = index2entry(*handle, chainindex + rulenum); 12401cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12411cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return &e->counters; 12421cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte} 12431cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12441cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welteint 12451cef74d943055668b5e356eebea877fdaa1ce3e0Harald WelteTC_ZERO_COUNTER(const IPT_CHAINLABEL chain, 12461cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte unsigned int rulenum, 12471cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte TC_HANDLE_T *handle) 12481cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte{ 12491cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte STRUCT_ENTRY *e; 12501cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte struct chain_cache *c; 12511cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte unsigned int chainindex, end; 12521cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12531cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte iptc_fn = TC_ZERO_COUNTER; 12541cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte CHECK(*handle); 12551cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12561cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if (!(c = find_label(chain, *handle))) { 12571cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte errno = ENOENT; 12581cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return 0; 12591cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 12601cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12611cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte chainindex = entry2index(*handle, c->start); 12621cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte end = entry2index(*handle, c->end); 12631cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12641cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if (chainindex + rulenum > end) { 12651cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte errno = E2BIG; 12661cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return 0; 12671cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 12681cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12691cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte e = index2entry(*handle, chainindex + rulenum); 12701cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12711cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if ((*handle)->counter_map[chainindex + rulenum].maptype 12721cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte == COUNTER_MAP_NORMAL_MAP) { 12731cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte (*handle)->counter_map[chainindex + rulenum].maptype 12741cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte = COUNTER_MAP_ZEROED; 12751cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 12761cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12771cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte set_changed(*handle); 12781cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12791cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return 1; 12801cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte} 12811cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12821cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welteint 12831cef74d943055668b5e356eebea877fdaa1ce3e0Harald WelteTC_SET_COUNTER(const IPT_CHAINLABEL chain, 12841cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte unsigned int rulenum, 12851cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte STRUCT_COUNTERS *counters, 12861cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte TC_HANDLE_T *handle) 12871cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte{ 12881cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte STRUCT_ENTRY *e; 12891cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte struct chain_cache *c; 12901cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte unsigned int chainindex, end; 12911cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12921cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte iptc_fn = TC_SET_COUNTER; 12931cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte CHECK(*handle); 12941cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 12951cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if (!(c = find_label(chain, *handle))) { 12961cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte errno = ENOENT; 12971cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return 0; 12981cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 12991cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 13001cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte chainindex = entry2index(*handle, c->start); 13011cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte end = entry2index(*handle, c->end); 13021cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 13031cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if (chainindex + rulenum > end) { 13041cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte errno = E2BIG; 13051cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return 0; 13061cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 13071cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 13081cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte e = index2entry(*handle, chainindex + rulenum); 13091cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 13101cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte (*handle)->counter_map[chainindex + rulenum].maptype 13111cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte = COUNTER_MAP_SET; 13121cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 13131cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte memcpy(&e->counters, counters, sizeof(STRUCT_COUNTERS)); 13141cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 13151cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte set_changed(*handle); 13161cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 13171cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte return 1; 13181cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte} 13191cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 1320e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Creates a new chain. */ 1321e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* To create a chain, create two rules: error node and unconditional 1322e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * return. */ 1323e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 132479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_CREATE_CHAIN(const IPT_CHAINLABEL chain, TC_HANDLE_T *handle) 1325e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1326e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 1327e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct { 132879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY head; 1329e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_error_target name; 133079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY ret; 133179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_STANDARD_TARGET target; 1332e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } newc; 1333e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 133479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_CREATE_CHAIN; 1335e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1336e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* find_label doesn't cover built-in targets: DROP, ACCEPT, 1337e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher QUEUE, RETURN. */ 133830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (find_label(chain, *handle) 133979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell || strcmp(chain, LABEL_DROP) == 0 134079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell || strcmp(chain, LABEL_ACCEPT) == 0 134167088e73ce7707229c56987868f112051defca5aRusty Russell || strcmp(chain, LABEL_QUEUE) == 0 134279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell || strcmp(chain, LABEL_RETURN) == 0) { 1343e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EEXIST; 1344e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1345e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1346e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 134779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (strlen(chain)+1 > sizeof(IPT_CHAINLABEL)) { 1348e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 1349e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1350e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1351e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1352e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memset(&newc, 0, sizeof(newc)); 135379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell newc.head.target_offset = sizeof(STRUCT_ENTRY); 1354e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newc.head.next_offset 135567088e73ce7707229c56987868f112051defca5aRusty Russell = sizeof(STRUCT_ENTRY) 13568c700900e2a0cf87d7917cb62578583a60ad1210Philip Blundell + ALIGN(sizeof(struct ipt_error_target)); 135767088e73ce7707229c56987868f112051defca5aRusty Russell strcpy(newc.name.t.u.user.name, ERROR_TARGET); 13588c700900e2a0cf87d7917cb62578583a60ad1210Philip Blundell newc.name.t.u.target_size = ALIGN(sizeof(struct ipt_error_target)); 1359e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher strcpy(newc.name.error, chain); 1360e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 136179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell newc.ret.target_offset = sizeof(STRUCT_ENTRY); 1362e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newc.ret.next_offset 136367088e73ce7707229c56987868f112051defca5aRusty Russell = sizeof(STRUCT_ENTRY) 13648c700900e2a0cf87d7917cb62578583a60ad1210Philip Blundell + ALIGN(sizeof(STRUCT_STANDARD_TARGET)); 136579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell strcpy(newc.target.target.u.user.name, STANDARD_TARGET); 136667088e73ce7707229c56987868f112051defca5aRusty Russell newc.target.target.u.target_size 13678c700900e2a0cf87d7917cb62578583a60ad1210Philip Blundell = ALIGN(sizeof(STRUCT_STANDARD_TARGET)); 136879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell newc.target.verdict = RETURN; 1369e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1370e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Add just before terminal entry */ 1371e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ret = insert_rules(2, sizeof(newc), &newc.head, 1372e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher index2offset(*handle, (*handle)->new_number - 1), 1373e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->new_number - 1, 1374e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 0, handle); 1375e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 1376e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1377e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1378e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 137979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellcount_ref(STRUCT_ENTRY *e, unsigned int offset, unsigned int *ref) 1380e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 138179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_STANDARD_TARGET *t; 1382e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 138379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (strcmp(GET_TARGET(e)->u.user.name, STANDARD_TARGET) == 0) { 138479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell t = (STRUCT_STANDARD_TARGET *)GET_TARGET(e); 1385e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1386e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (t->verdict == offset) 1387e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*ref)++; 1388e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1389e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1390e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1391e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1392e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1393e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Get the number of references to this chain. */ 1394e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 139579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_GET_REFERENCES(unsigned int *ref, const IPT_CHAINLABEL chain, 139679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 1397e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 139830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 1399e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 140030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 1401e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1402e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1403e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1404e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1405e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *ref = 0; 1406725d97a79cf0b332ed45cb7d254915178328427dRusty Russell ENTRY_ITERATE((*handle)->entries.entrytable, 140779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell (*handle)->entries.size, 140879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell count_ref, entry2offset(*handle, c->start), ref); 1409e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 1410e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1411e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1412e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Deletes a chain. */ 1413e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 141479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_DELETE_CHAIN(const IPT_CHAINLABEL chain, TC_HANDLE_T *handle) 1415e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 141630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int labelidx, labeloff; 1417e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int references; 141830fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 1419e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int ret; 1420e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 142179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (!TC_GET_REFERENCES(&references, chain, handle)) 1422e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 14237e53bf9c2a697abdb6f1385557338423a86612a3Rusty Russell 142479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_DELETE_CHAIN; 1425e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 142679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (TC_BUILTIN(chain, *handle)) { 1427e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 1428e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1429e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1430e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1431e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (references > 0) { 1432e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EMLINK; 1433e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1434e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1435e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 143630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(chain, *handle))) { 1437e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1438e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1439e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1440e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 144130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if ((void *)c->start != c->end) { 1442e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOTEMPTY; 1443e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1444e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1445e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1446e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Need label index: preceeds chain start */ 144730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell labelidx = entry2index(*handle, c->start) - 1; 1448e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher labeloff = index2offset(*handle, labelidx); 1449e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1450e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ret = delete_rules(2, 1451e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher get_entry(*handle, labeloff)->next_offset 145230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell + c->start->next_offset, 1453e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher labeloff, labelidx, handle); 1454e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return ret; 1455e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1456e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1457e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Renames a chain. */ 145879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellint TC_RENAME_CHAIN(const IPT_CHAINLABEL oldname, 145979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const IPT_CHAINLABEL newname, 146079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 1461e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 146230fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell unsigned int labeloff, labelidx; 146330fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell struct chain_cache *c; 1464e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_error_target *t; 1465e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 146679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_RENAME_CHAIN; 1467e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 14681de804642d4c8e9c71b7e225a1528fff15fa7faaHarald Welte /* find_label doesn't cover built-in targets: DROP, ACCEPT, 14691de804642d4c8e9c71b7e225a1528fff15fa7faaHarald Welte QUEUE, RETURN. */ 147030fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (find_label(newname, *handle) 147179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell || strcmp(newname, LABEL_DROP) == 0 147279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell || strcmp(newname, LABEL_ACCEPT) == 0 14731de804642d4c8e9c71b7e225a1528fff15fa7faaHarald Welte || strcmp(newname, LABEL_QUEUE) == 0 147479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell || strcmp(newname, LABEL_RETURN) == 0) { 1475e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EEXIST; 1476e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1477e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1478e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 147930fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if (!(c = find_label(oldname, *handle)) 148079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell || TC_BUILTIN(oldname, *handle)) { 1481e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOENT; 1482e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1483e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1484e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 148579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (strlen(newname)+1 > sizeof(IPT_CHAINLABEL)) { 1486e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 1487e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1488e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1489e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1490e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Need label index: preceeds chain start */ 149130fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell labelidx = entry2index(*handle, c->start) - 1; 1492e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher labeloff = index2offset(*handle, labelidx); 1493e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1494e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher t = (struct ipt_error_target *) 149579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell GET_TARGET(get_entry(*handle, labeloff)); 1496e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1497e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memset(t->error, 0, sizeof(t->error)); 1498e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher strcpy(t->error, newname); 1499175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell set_changed(*handle); 1500e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1501e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 1502e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1503e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1504e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Sets the policy on a built-in chain. */ 1505e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 150679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_SET_POLICY(const IPT_CHAINLABEL chain, 150779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const IPT_CHAINLABEL policy, 15081cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte STRUCT_COUNTERS *counters, 150979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell TC_HANDLE_T *handle) 1510e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1511e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int hook; 15121cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte unsigned int policyoff, ctrindex; 151379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_ENTRY *e; 151479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_STANDARD_TARGET *t; 1515e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 151679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell iptc_fn = TC_SET_POLICY; 1517e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Figure out which chain. */ 151879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell hook = TC_BUILTIN(chain, *handle); 1519e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (hook == 0) { 1520c8264991454b5e77279830736f80ea3153b6f814Marc Boucher errno = ENOENT; 1521e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1522e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else 1523e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher hook--; 1524e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1525e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher policyoff = get_chain_end(*handle, (*handle)->info.hook_entry[hook]); 1526e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (policyoff != (*handle)->info.underflow[hook]) { 1527e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("ERROR: Policy for `%s' offset %u != underflow %u\n", 1528e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher chain, policyoff, (*handle)->info.underflow[hook]); 1529e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1530e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1531e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1532e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher e = get_entry(*handle, policyoff); 153379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell t = (STRUCT_STANDARD_TARGET *)GET_TARGET(e); 1534e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 153579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (strcmp(policy, LABEL_ACCEPT) == 0) 1536e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher t->verdict = -NF_ACCEPT - 1; 153779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell else if (strcmp(policy, LABEL_DROP) == 0) 1538e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher t->verdict = -NF_DROP - 1; 1539e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else { 1540e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = EINVAL; 1541e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1542e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 15431cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 15441cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte ctrindex = entry2index(*handle, e); 15451cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 15461cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte if (counters) { 15471cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte /* set byte and packet counters */ 15481cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte memcpy(&e->counters, counters, sizeof(STRUCT_COUNTERS)); 15491cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 15501cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte (*handle)->counter_map[ctrindex].maptype 15511cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte = COUNTER_MAP_SET; 15521cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 15531cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } else { 15541cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte (*handle)->counter_map[ctrindex] 15551cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte = ((struct counter_map){ COUNTER_MAP_NOMAP, 0 }); 15561cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte } 15571cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 1558175f64177743e5a417e98d483ef995bf7151f3bcRusty Russell set_changed(*handle); 1559e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1560e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 1561e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1562e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1563e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Without this, on gcc 2.7.2.3, we get: 156479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell libiptc.c: In function `TC_COMMIT': 1565e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher libiptc.c:833: fixed or forbidden register was spilled. 1566e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher This may be due to a compiler bug or to impossible asm 1567e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher statements or clauses. 1568e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher*/ 1569e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void 157079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russellsubtract_counters(STRUCT_COUNTERS *answer, 157179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_COUNTERS *a, 157279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell const STRUCT_COUNTERS *b) 1573e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1574e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher answer->pcnt = a->pcnt - b->pcnt; 1575e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher answer->bcnt = a->bcnt - b->bcnt; 1576e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1577e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1578e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 157979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_COMMIT(TC_HANDLE_T *handle) 1580e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1581e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Replace, then map back the counters. */ 158279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_REPLACE *repl; 158379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell STRUCT_COUNTERS_INFO *newcounters; 1584e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 1585e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher size_t counterlen 158679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell = sizeof(STRUCT_COUNTERS_INFO) 158779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell + sizeof(STRUCT_COUNTERS) * (*handle)->new_number; 1588e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1589e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher CHECK(*handle); 1590e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#if 0 159154c307e0ff401f40a6fe382af4ae5bff0f5b40baRusty Russell TC_DUMP_ENTRIES(*handle); 1592e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#endif 1593e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1594e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Don't commit if nothing changed. */ 1595e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!(*handle)->changed) 1596e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher goto finished; 1597e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1598e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher repl = malloc(sizeof(*repl) + (*handle)->entries.size); 1599e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!repl) { 1600e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOMEM; 1601e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1602e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1603e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1604e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* These are the old counters we will get from kernel */ 160579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell repl->counters = malloc(sizeof(STRUCT_COUNTERS) 1606e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * (*handle)->info.num_entries); 1607e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!repl->counters) { 1608e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl); 1609e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOMEM; 1610e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1611e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 16127e53bf9c2a697abdb6f1385557338423a86612a3Rusty Russell 1613e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* These are the counters we're going to put back, later. */ 1614e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newcounters = malloc(counterlen); 1615e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!newcounters) { 1616e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl->counters); 1617e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl); 1618e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher errno = ENOMEM; 1619e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1620e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1621e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1622e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher strcpy(repl->name, (*handle)->info.name); 1623e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher repl->num_entries = (*handle)->new_number; 1624e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher repl->size = (*handle)->entries.size; 1625e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memcpy(repl->hook_entry, (*handle)->info.hook_entry, 1626e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher sizeof(repl->hook_entry)); 1627e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memcpy(repl->underflow, (*handle)->info.underflow, 1628e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher sizeof(repl->underflow)); 1629e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher repl->num_counters = (*handle)->info.num_entries; 1630e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher repl->valid_hooks = (*handle)->info.valid_hooks; 1631725d97a79cf0b332ed45cb7d254915178328427dRusty Russell memcpy(repl->entries, (*handle)->entries.entrytable, 1632e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher (*handle)->entries.size); 1633e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 163479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (setsockopt(sockfd, TC_IPPROTO, SO_SET_REPLACE, repl, 1635e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher sizeof(*repl) + (*handle)->entries.size) < 0) { 1636e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl->counters); 1637e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl); 1638e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(newcounters); 1639e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1640e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1641e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1642e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Put counters back. */ 1643e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher strcpy(newcounters->name, (*handle)->info.name); 1644e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newcounters->num_counters = (*handle)->new_number; 1645e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < (*handle)->new_number; i++) { 1646e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int mappos = (*handle)->counter_map[i].mappos; 1647e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher switch ((*handle)->counter_map[i].maptype) { 1648e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher case COUNTER_MAP_NOMAP: 1649e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newcounters->counters[i] 165079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell = ((STRUCT_COUNTERS){ 0, 0 }); 1651e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher break; 1652e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1653e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher case COUNTER_MAP_NORMAL_MAP: 1654e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Original read: X. 1655e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Atomic read on replacement: X + Y. 1656e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Currently in kernel: Z. 1657e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Want in kernel: X + Y + Z. 1658e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * => Add in X + Y 1659e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * => Add in replacement read. 1660e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher */ 1661e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher newcounters->counters[i] = repl->counters[mappos]; 1662e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher break; 1663e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1664e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher case COUNTER_MAP_ZEROED: 1665e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Original read: X. 1666e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Atomic read on replacement: X + Y. 1667e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Currently in kernel: Z. 1668e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * Want in kernel: Y + Z. 1669e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * => Add in Y. 1670e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher * => Add in (replacement read - original read). 1671e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher */ 1672e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher subtract_counters(&newcounters->counters[i], 1673e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher &repl->counters[mappos], 1674e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher &index2entry(*handle, i)->counters); 1675e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher break; 16761cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 16771cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte case COUNTER_MAP_SET: 16781cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte /* Want to set counter (iptables-restore) */ 16791cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 16801cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte memcpy(&newcounters->counters[i], 16811cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte &index2entry(*handle, i)->counters, 16821cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte sizeof(STRUCT_COUNTERS)); 16831cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte 16841cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte break; 1685e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1686e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 168762527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell 168862527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell#ifdef KERNEL_64_USERSPACE_32 168962527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell { 169062527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell /* Kernel will think that pointer should be 64-bits, and get 169162527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell padding. So we accomodate here (assumption: alignment of 169262527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell `counters' is on 64-bit boundary). */ 169362527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell u_int64_t *kernptr = (u_int64_t *)&newcounters->counters; 169462527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell if ((unsigned long)&newcounters->counters % 8 != 0) { 169562527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell fprintf(stderr, 169662527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell "counters alignment incorrect! Mail rusty!\n"); 169762527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell abort(); 169862527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell } 169962527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell *kernptr = newcounters->counters; 170054c307e0ff401f40a6fe382af4ae5bff0f5b40baRusty Russell } 170162527ce5f0ffaa5b18aa118f64c21af238ddc156Rusty Russell#endif /* KERNEL_64_USERSPACE_32 */ 1702e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 170379dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell if (setsockopt(sockfd, TC_IPPROTO, SO_SET_ADD_COUNTERS, 170479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell newcounters, counterlen) < 0) { 1705e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl->counters); 1706e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl); 1707e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(newcounters); 1708e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 1709e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1710e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1711e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl->counters); 1712e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(repl); 1713e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(newcounters); 1714e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1715e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher finished: 171630fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell if ((*handle)->cache_chain_heads) 171730fd6e5d45e6013f4df10a226787c7a9f49369c1Rusty Russell free((*handle)->cache_chain_heads); 1718e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher free(*handle); 1719e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *handle = NULL; 1720e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 1721e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1722e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1723e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Get raw socket. */ 1724e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherint 172579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_GET_RAW_SOCKET() 1726e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1727e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return sockfd; 1728e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1729e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1730e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Translates errno numbers into more human-readable form than strerror. */ 1731e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherconst char * 173279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty RussellTC_STRERROR(int err) 1733e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 1734e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i; 1735e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct table_struct { 1736e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher void *fn; 1737e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int err; 1738e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher const char *message; 1739e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } table [] = 17404ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { { TC_INIT, EPERM, "Permission denied (you must be root)" }, 174179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_INIT, EINVAL, "Module is wrong version" }, 17424ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { TC_INIT, ENOENT, 17434ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte "Table does not exist (do you need to insmod?)" }, 174479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_DELETE_CHAIN, ENOTEMPTY, "Chain is not empty" }, 174579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_DELETE_CHAIN, EINVAL, "Can't delete built-in chain" }, 174679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_DELETE_CHAIN, EMLINK, 1747e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Can't delete chain with references left" }, 174879dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_CREATE_CHAIN, EEXIST, "Chain already exists" }, 174979dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_INSERT_ENTRY, E2BIG, "Index of insertion too big" }, 175079dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_REPLACE_ENTRY, E2BIG, "Index of replacement too big" }, 175179dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_DELETE_NUM_ENTRY, E2BIG, "Index of deletion too big" }, 17521cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte { TC_READ_COUNTER, E2BIG, "Index of counter too big" }, 17531cef74d943055668b5e356eebea877fdaa1ce3e0Harald Welte { TC_ZERO_COUNTER, E2BIG, "Index of counter too big" }, 175479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_INSERT_ENTRY, ELOOP, "Loop found in table" }, 175579dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_INSERT_ENTRY, EINVAL, "Target problem" }, 1756e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* EINVAL for CHECK probably means bad interface. */ 175779dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_CHECK_PACKET, EINVAL, 1758c8264991454b5e77279830736f80ea3153b6f814Marc Boucher "Bad arguments (does that interface exist?)" }, 17594ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { TC_CHECK_PACKET, ENOSYS, 17604ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte "Checking will most likely never get implemented" }, 1761e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* ENOENT for DELETE probably means no matching rule */ 176279dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_DELETE_ENTRY, ENOENT, 1763c8264991454b5e77279830736f80ea3153b6f814Marc Boucher "Bad rule (does a matching rule exist in that chain?)" }, 176479dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_SET_POLICY, ENOENT, 1765c8264991454b5e77279830736f80ea3153b6f814Marc Boucher "Bad built-in chain name" }, 176679dee0702b18c8ea1d1f7a2b1f6b29349466986bRusty Russell { TC_SET_POLICY, EINVAL, 1767c8264991454b5e77279830736f80ea3153b6f814Marc Boucher "Bad policy name" }, 17684ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte 17694ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { NULL, 0, "Incompatible with this kernel" }, 17704ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { NULL, ENOPROTOOPT, "iptables who? (do you need to insmod?)" }, 17714ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { NULL, ENOSYS, "Will be implemented real soon. I promise ;)" }, 17724ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { NULL, ENOMEM, "Memory allocation problem" }, 17734ccfa630d9a588d4b852abef8bc467642427c8cfHarald Welte { NULL, ENOENT, "No chain/target/match by that name" }, 1774e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher }; 1775e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1776e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < sizeof(table)/sizeof(struct table_struct); i++) { 1777e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if ((!table[i].fn || table[i].fn == iptc_fn) 1778e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher && table[i].err == err) 1779e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return table[i].message; 1780e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 1781e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 1782e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return strerror(err); 1783e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 1784