dn_neigh.c revision 0da974f4f303a6842516b764507e3c0a03f41e5a
1ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross/* 2caf2ee14bbc2c6bd73cf0decf576007e0239a482Raju Subramanian * DECnet An implementation of the DECnet protocol suite for the LINUX 3ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * operating system. DECnet is implemented using the BSD Socket 4ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * interface as the means of communication with the user level. 5ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * 6ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * DECnet Neighbour Functions (Adjacency Database and 7ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * On-Ethernet Cache) 8ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * 9ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Author: Steve Whitehouse <SteveW@ACM.org> 10ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * 11ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * 12ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Changes: 13ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Fixed router listing routine 14ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Added error_report functions 15ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Added default router detection 16ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Hop counts in outgoing messages 17ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Fixed src/dst in outgoing messages so 18ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * forwarding now stands a good chance of 19ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * working. 20ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Fixed neighbour states (for now anyway). 21ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Made error_report functions dummies. This 22ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * is not the right place to return skbs. 23ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Steve Whitehouse : Convert to seq_file 24ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * 25ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross */ 26ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 277fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross#include <linux/net.h> 287fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross#include <linux/module.h> 295b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko#include <linux/socket.h> 307fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross#include <linux/if_arp.h> 31ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/if_ether.h> 32ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/init.h> 33ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/proc_fs.h> 34ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/string.h> 35ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/netfilter_decnet.h> 36ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/spinlock.h> 37ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/seq_file.h> 38ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/rcupdate.h> 39ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <linux/jhash.h> 40ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <asm/atomic.h> 41ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <net/neighbour.h> 42ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <net/dst.h> 43ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <net/flow.h> 44ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <net/dn.h> 45ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <net/dn_dev.h> 46ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <net/dn_neigh.h> 47ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross#include <net/dn_route.h> 48ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 49ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic u32 dn_neigh_hash(const void *pkey, const struct net_device *dev); 50ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic int dn_neigh_construct(struct neighbour *); 51ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic void dn_long_error_report(struct neighbour *, struct sk_buff *); 52ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic void dn_short_error_report(struct neighbour *, struct sk_buff *); 53ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic int dn_long_output(struct sk_buff *); 54ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic int dn_short_output(struct sk_buff *); 55ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic int dn_phase3_output(struct sk_buff *); 56ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 57ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 58ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross/* 59ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * For talking to broadcast devices: Ethernet & PPP 60ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross */ 61ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic struct neigh_ops dn_long_ops = { 62ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .family = AF_DECnet, 63ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .error_report = dn_long_error_report, 64ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .output = dn_long_output, 65ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .connected_output = dn_long_output, 66ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .hh_output = dev_queue_xmit, 67ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .queue_xmit = dev_queue_xmit, 68ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross}; 69ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 70ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross/* 717d5437c709ded4f152cb8b305d17972d6707f20cPravin B Shelar * For talking to pointopoint and multidrop devices: DDCMP and X.25 72ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross */ 73ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic struct neigh_ops dn_short_ops = { 74ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .family = AF_DECnet, 75ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .error_report = dn_short_error_report, 76ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .output = dn_short_output, 77ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .connected_output = dn_short_output, 78ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .hh_output = dev_queue_xmit, 79ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .queue_xmit = dev_queue_xmit, 80ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross}; 81ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 82ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross/* 83ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * For talking to DECnet phase III nodes 84ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross */ 85ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic struct neigh_ops dn_phase3_ops = { 86ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .family = AF_DECnet, 87ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .error_report = dn_short_error_report, /* Can use short version here */ 88ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .output = dn_phase3_output, 89ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .connected_output = dn_phase3_output, 90ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .hh_output = dev_queue_xmit, 917826d43f2db45c9305a6e0ba165650e1a203f517Jiri Pirko .queue_xmit = dev_queue_xmit 92ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross}; 93ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 94ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstruct neigh_table dn_neigh_table = { 95ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .family = PF_DECnet, 96ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .entry_size = sizeof(struct dn_neigh), 97ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .key_len = sizeof(__le16), 98ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .hash = dn_neigh_hash, 99ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .constructor = dn_neigh_construct, 100ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .id = "dn_neigh_cache", 101ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .parms ={ 102ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .tbl = &dn_neigh_table, 103ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .base_reachable_time = 30 * HZ, 104ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .retrans_time = 1 * HZ, 105ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .gc_staletime = 60 * HZ, 106ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .reachable_time = 30 * HZ, 107ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .delay_probe_time = 5 * HZ, 108ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .queue_len = 3, 109ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .ucast_probes = 0, 110ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .app_probes = 0, 111ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .mcast_probes = 0, 112ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .anycast_delay = 0, 113ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .proxy_delay = 0, 114ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .proxy_qlen = 0, 115ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .locktime = 1 * HZ, 116ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross }, 117ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .gc_interval = 30 * HZ, 118ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .gc_thresh1 = 128, 119ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross .gc_thresh2 = 512, 1209151991c028ccae896388d8b1d2d8a3e3deb2b9aThomas Graf .gc_thresh3 = 1024, 121ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross}; 122ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 123ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic u32 dn_neigh_hash(const void *pkey, const struct net_device *dev) 124ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross{ 1255b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko return jhash_2words(*(__u16 *)pkey, 0, dn_neigh_table.hash_rnd); 1265b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko} 1275b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko 1285b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirkostatic int dn_neigh_construct(struct neighbour *neigh) 129ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross{ 130ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct net_device *dev = neigh->dev; 131ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct dn_neigh *dn = (struct dn_neigh *)neigh; 132ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct dn_dev *dn_db; 133ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct neigh_parms *parms; 134ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 135ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross rcu_read_lock(); 1369151991c028ccae896388d8b1d2d8a3e3deb2b9aThomas Graf dn_db = rcu_dereference(dev->dn_ptr); 137ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if (dn_db == NULL) { 1387ad24ea4bf620a32631d7b3069c3e30c078b0c3eWilfried Klaebe rcu_read_unlock(); 1395b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko return -EINVAL; 140ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross } 141ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 142ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross parms = dn_db->neigh_parms; 143f6eec614d2252a99b861e288b6301599d2d58da4Pravin B Shelar if (!parms) { 144f6eec614d2252a99b861e288b6301599d2d58da4Pravin B Shelar rcu_read_unlock(); 145ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross return -EINVAL; 146ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross } 147f6eec614d2252a99b861e288b6301599d2d58da4Pravin B Shelar 148f646968f8f7c624587de729115d802372b9063ddPatrick McHardy __neigh_parms_put(neigh->parms); 149ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross neigh->parms = neigh_parms_clone(parms); 150f6eec614d2252a99b861e288b6301599d2d58da4Pravin B Shelar 1517ce5d222190cb3ce3ae88bafde7c4fa52a5103e0Danny Kukawka if (dn_db->use_long) 152ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross neigh->ops = &dn_long_ops; 153ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross else 154ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross neigh->ops = &dn_short_ops; 155ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross rcu_read_unlock(); 156ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 157ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if (dn->flags & DN_NDFLAG_P3) 158ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross neigh->ops = &dn_phase3_ops; 159ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 160ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross neigh->nud_state = NUD_NOARP; 161ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross neigh->output = neigh->ops->connected_output; 162ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 163ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT)) 164ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross memcpy(neigh->ha, dev->broadcast, dev->addr_len); 165ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK)) 166ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross dn_dn2eth(neigh->ha, dn->addr); 167ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross else { 168ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if (net_ratelimit()) 169ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross printk(KERN_DEBUG "Trying to create neigh for hw %d\n", dev->type); 170ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross return -EINVAL; 171c835a677331495cf137a7f8a023463afd9f032f8Tom Gundersen } 172c835a677331495cf137a7f8a023463afd9f032f8Tom Gundersen 173ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross /* 174ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * Make an estimate of the remote block size by assuming that its 175ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * two less then the device mtu, which it true for ethernet (and 176ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * other things which support long format headers) since there is 177ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * an extra length field (of 16 bits) which isn't part of the 17846df7b814548849deee01f50bc75f8f5ae8cd767Pravin B Shelar * ethernet headers and which the DECnet specs won't admit is part 179ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * of the DECnet routing headers either. 180ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * 181ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross * If we over estimate here its no big deal, the NSP negotiations 18246df7b814548849deee01f50bc75f8f5ae8cd767Pravin B Shelar * will prevent us from sending packets which are too large for the 18346df7b814548849deee01f50bc75f8f5ae8cd767Pravin B Shelar * remote node to handle. In any case this figure is normally updated 18446df7b814548849deee01f50bc75f8f5ae8cd767Pravin B Shelar * by a hello message in most cases. 18546df7b814548849deee01f50bc75f8f5ae8cd767Pravin B Shelar */ 1868e4e1713e4978447c5f799aa668dcc6d2cb0dee9Pravin B Shelar dn->blksize = dev->mtu - 2; 187ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 188ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross return 0; 189ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross} 190ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 191ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic void dn_long_error_report(struct neighbour *neigh, struct sk_buff *skb) 1928e4e1713e4978447c5f799aa668dcc6d2cb0dee9Pravin B Shelar{ 193ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross printk(KERN_DEBUG "dn_long_error_report: called\n"); 194ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross kfree_skb(skb); 195ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross} 196ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 197ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 1988e4e1713e4978447c5f799aa668dcc6d2cb0dee9Pravin B Shelarstatic void dn_short_error_report(struct neighbour *neigh, struct sk_buff *skb) 199ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross{ 200ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross printk(KERN_DEBUG "dn_short_error_report: called\n"); 201ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross kfree_skb(skb); 202ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross} 203ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 204ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic int dn_neigh_output_packet(struct sk_buff *skb) 205ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross{ 206ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct dst_entry *dst = skb->dst; 207ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct dn_route *rt = (struct dn_route *)dst; 208ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct neighbour *neigh = dst->neighbour; 209ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct net_device *dev = neigh->dev; 210ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross char mac_addr[ETH_ALEN]; 2118e4e1713e4978447c5f799aa668dcc6d2cb0dee9Pravin B Shelar 212ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross dn_dn2eth(mac_addr, rt->rt_local_src); 213ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if (!dev->hard_header || dev->hard_header(skb, dev, ntohs(skb->protocol), neigh->ha, mac_addr, skb->len) >= 0) 214ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross return neigh->ops->queue_xmit(skb); 215ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 2168e4e1713e4978447c5f799aa668dcc6d2cb0dee9Pravin B Shelar if (net_ratelimit()) 2178e4e1713e4978447c5f799aa668dcc6d2cb0dee9Pravin B Shelar printk(KERN_DEBUG "dn_neigh_output_packet: oops, can't send packet\n"); 218ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 219ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross kfree_skb(skb); 220ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross return -EINVAL; 221ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross} 222ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 223ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Grossstatic int dn_long_output(struct sk_buff *skb) 224ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross{ 225ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct dst_entry *dst = skb->dst; 2267fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross struct neighbour *neigh = dst->neighbour; 2277fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross struct net_device *dev = neigh->dev; 2287fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3; 2297fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross unsigned char *data; 2307fe99e2d434eafeac0c57b279a77e5de39212636Jesse Gross struct dn_long_packet *lp; 231ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct dn_skb_cb *cb = DN_SKB_CB(skb); 232ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 233ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 234b34df5e805a6e98cae0bc5bc80c1b52d9ff811dePravin B Shelar if (skb_headroom(skb) < headroom) { 235ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); 236ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if (skb2 == NULL) { 237ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if (net_ratelimit()) 238ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross printk(KERN_CRIT "dn_long_output: no memory\n"); 239ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross kfree_skb(skb); 240ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross return -ENOBUFS; 241ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross } 242ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross kfree_skb(skb); 243ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross skb = skb2; 244ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross if (net_ratelimit()) 245ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross printk(KERN_INFO "dn_long_output: Increasing headroom\n"); 246ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross } 247ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 248ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross data = skb_push(skb, sizeof(struct dn_long_packet) + 3); 249ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross lp = (struct dn_long_packet *)(data+3); 250ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 251ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross *((__le16 *)data) = dn_htons(skb->len - 2); 252ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross *(data + 2) = 1 | DN_RT_F_PF; /* Padding */ 253ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross 254ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS)); 255ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross lp->d_area = lp->d_subarea = 0; 256ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross dn_dn2eth(lp->d_id, cb->dst); 257ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross lp->s_area = lp->s_subarea = 0; 258ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross dn_dn2eth(lp->s_id, cb->src); 259ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross lp->nl2 = 0; 260ccb1352e76cff0524e7ccb2074826a092dd13016Jesse Gross lp->visit_ct = cb->hops & 0x3f; 2615b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko lp->s_class = 0; 2625b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko lp->pt = 0; 2635b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko 2645b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko skb->nh.raw = skb->data; 2655b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko 2665b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet); 2675b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko} 2685b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko 2695b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirkostatic int dn_short_output(struct sk_buff *skb) 2705b9e7e1607956e2454ccbd94ccf5631309ade054Jiri Pirko{ 271 struct dst_entry *dst = skb->dst; 272 struct neighbour *neigh = dst->neighbour; 273 struct net_device *dev = neigh->dev; 274 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2; 275 struct dn_short_packet *sp; 276 unsigned char *data; 277 struct dn_skb_cb *cb = DN_SKB_CB(skb); 278 279 280 if (skb_headroom(skb) < headroom) { 281 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); 282 if (skb2 == NULL) { 283 if (net_ratelimit()) 284 printk(KERN_CRIT "dn_short_output: no memory\n"); 285 kfree_skb(skb); 286 return -ENOBUFS; 287 } 288 kfree_skb(skb); 289 skb = skb2; 290 if (net_ratelimit()) 291 printk(KERN_INFO "dn_short_output: Increasing headroom\n"); 292 } 293 294 data = skb_push(skb, sizeof(struct dn_short_packet) + 2); 295 *((__le16 *)data) = dn_htons(skb->len - 2); 296 sp = (struct dn_short_packet *)(data+2); 297 298 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS)); 299 sp->dstnode = cb->dst; 300 sp->srcnode = cb->src; 301 sp->forward = cb->hops & 0x3f; 302 303 skb->nh.raw = skb->data; 304 305 return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet); 306} 307 308/* 309 * Phase 3 output is the same is short output, execpt that 310 * it clears the area bits before transmission. 311 */ 312static int dn_phase3_output(struct sk_buff *skb) 313{ 314 struct dst_entry *dst = skb->dst; 315 struct neighbour *neigh = dst->neighbour; 316 struct net_device *dev = neigh->dev; 317 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2; 318 struct dn_short_packet *sp; 319 unsigned char *data; 320 struct dn_skb_cb *cb = DN_SKB_CB(skb); 321 322 if (skb_headroom(skb) < headroom) { 323 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); 324 if (skb2 == NULL) { 325 if (net_ratelimit()) 326 printk(KERN_CRIT "dn_phase3_output: no memory\n"); 327 kfree_skb(skb); 328 return -ENOBUFS; 329 } 330 kfree_skb(skb); 331 skb = skb2; 332 if (net_ratelimit()) 333 printk(KERN_INFO "dn_phase3_output: Increasing headroom\n"); 334 } 335 336 data = skb_push(skb, sizeof(struct dn_short_packet) + 2); 337 *((__le16 *)data) = dn_htons(skb->len - 2); 338 sp = (struct dn_short_packet *)(data + 2); 339 340 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS)); 341 sp->dstnode = cb->dst & dn_htons(0x03ff); 342 sp->srcnode = cb->src & dn_htons(0x03ff); 343 sp->forward = cb->hops & 0x3f; 344 345 skb->nh.raw = skb->data; 346 347 return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet); 348} 349 350/* 351 * Unfortunately, the neighbour code uses the device in its hash 352 * function, so we don't get any advantage from it. This function 353 * basically does a neigh_lookup(), but without comparing the device 354 * field. This is required for the On-Ethernet cache 355 */ 356 357/* 358 * Pointopoint link receives a hello message 359 */ 360void dn_neigh_pointopoint_hello(struct sk_buff *skb) 361{ 362 kfree_skb(skb); 363} 364 365/* 366 * Ethernet router hello message received 367 */ 368int dn_neigh_router_hello(struct sk_buff *skb) 369{ 370 struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data; 371 372 struct neighbour *neigh; 373 struct dn_neigh *dn; 374 struct dn_dev *dn_db; 375 __le16 src; 376 377 src = dn_eth2dn(msg->id); 378 379 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); 380 381 dn = (struct dn_neigh *)neigh; 382 383 if (neigh) { 384 write_lock(&neigh->lock); 385 386 neigh->used = jiffies; 387 dn_db = (struct dn_dev *)neigh->dev->dn_ptr; 388 389 if (!(neigh->nud_state & NUD_PERMANENT)) { 390 neigh->updated = jiffies; 391 392 if (neigh->dev->type == ARPHRD_ETHER) 393 memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN); 394 395 dn->blksize = dn_ntohs(msg->blksize); 396 dn->priority = msg->priority; 397 398 dn->flags &= ~DN_NDFLAG_P3; 399 400 switch(msg->iinfo & DN_RT_INFO_TYPE) { 401 case DN_RT_INFO_L1RT: 402 dn->flags &=~DN_NDFLAG_R2; 403 dn->flags |= DN_NDFLAG_R1; 404 break; 405 case DN_RT_INFO_L2RT: 406 dn->flags |= DN_NDFLAG_R2; 407 } 408 } 409 410 /* Only use routers in our area */ 411 if ((dn_ntohs(src)>>10) == (dn_ntohs((decnet_address))>>10)) { 412 if (!dn_db->router) { 413 dn_db->router = neigh_clone(neigh); 414 } else { 415 if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority) 416 neigh_release(xchg(&dn_db->router, neigh_clone(neigh))); 417 } 418 } 419 write_unlock(&neigh->lock); 420 neigh_release(neigh); 421 } 422 423 kfree_skb(skb); 424 return 0; 425} 426 427/* 428 * Endnode hello message received 429 */ 430int dn_neigh_endnode_hello(struct sk_buff *skb) 431{ 432 struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data; 433 struct neighbour *neigh; 434 struct dn_neigh *dn; 435 __le16 src; 436 437 src = dn_eth2dn(msg->id); 438 439 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); 440 441 dn = (struct dn_neigh *)neigh; 442 443 if (neigh) { 444 write_lock(&neigh->lock); 445 446 neigh->used = jiffies; 447 448 if (!(neigh->nud_state & NUD_PERMANENT)) { 449 neigh->updated = jiffies; 450 451 if (neigh->dev->type == ARPHRD_ETHER) 452 memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN); 453 dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2); 454 dn->blksize = dn_ntohs(msg->blksize); 455 dn->priority = 0; 456 } 457 458 write_unlock(&neigh->lock); 459 neigh_release(neigh); 460 } 461 462 kfree_skb(skb); 463 return 0; 464} 465 466static char *dn_find_slot(char *base, int max, int priority) 467{ 468 int i; 469 unsigned char *min = NULL; 470 471 base += 6; /* skip first id */ 472 473 for(i = 0; i < max; i++) { 474 if (!min || (*base < *min)) 475 min = base; 476 base += 7; /* find next priority */ 477 } 478 479 if (!min) 480 return NULL; 481 482 return (*min < priority) ? (min - 6) : NULL; 483} 484 485struct elist_cb_state { 486 struct net_device *dev; 487 unsigned char *ptr; 488 unsigned char *rs; 489 int t, n; 490}; 491 492static void neigh_elist_cb(struct neighbour *neigh, void *_info) 493{ 494 struct elist_cb_state *s = _info; 495 struct dn_neigh *dn; 496 497 if (neigh->dev != s->dev) 498 return; 499 500 dn = (struct dn_neigh *) neigh; 501 if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2))) 502 return; 503 504 if (s->t == s->n) 505 s->rs = dn_find_slot(s->ptr, s->n, dn->priority); 506 else 507 s->t++; 508 if (s->rs == NULL) 509 return; 510 511 dn_dn2eth(s->rs, dn->addr); 512 s->rs += 6; 513 *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0; 514 *(s->rs) |= dn->priority; 515 s->rs++; 516} 517 518int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n) 519{ 520 struct elist_cb_state state; 521 522 state.dev = dev; 523 state.t = 0; 524 state.n = n; 525 state.ptr = ptr; 526 state.rs = ptr; 527 528 neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state); 529 530 return state.t; 531} 532 533 534#ifdef CONFIG_PROC_FS 535 536static inline void dn_neigh_format_entry(struct seq_file *seq, 537 struct neighbour *n) 538{ 539 struct dn_neigh *dn = (struct dn_neigh *) n; 540 char buf[DN_ASCBUF_LEN]; 541 542 read_lock(&n->lock); 543 seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n", 544 dn_addr2asc(dn_ntohs(dn->addr), buf), 545 (dn->flags&DN_NDFLAG_R1) ? "1" : "-", 546 (dn->flags&DN_NDFLAG_R2) ? "2" : "-", 547 (dn->flags&DN_NDFLAG_P3) ? "3" : "-", 548 dn->n.nud_state, 549 atomic_read(&dn->n.refcnt), 550 dn->blksize, 551 (dn->n.dev) ? dn->n.dev->name : "?"); 552 read_unlock(&n->lock); 553} 554 555static int dn_neigh_seq_show(struct seq_file *seq, void *v) 556{ 557 if (v == SEQ_START_TOKEN) { 558 seq_puts(seq, "Addr Flags State Use Blksize Dev\n"); 559 } else { 560 dn_neigh_format_entry(seq, v); 561 } 562 563 return 0; 564} 565 566static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos) 567{ 568 return neigh_seq_start(seq, pos, &dn_neigh_table, 569 NEIGH_SEQ_NEIGH_ONLY); 570} 571 572static struct seq_operations dn_neigh_seq_ops = { 573 .start = dn_neigh_seq_start, 574 .next = neigh_seq_next, 575 .stop = neigh_seq_stop, 576 .show = dn_neigh_seq_show, 577}; 578 579static int dn_neigh_seq_open(struct inode *inode, struct file *file) 580{ 581 struct seq_file *seq; 582 int rc = -ENOMEM; 583 struct neigh_seq_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 584 585 if (!s) 586 goto out; 587 588 rc = seq_open(file, &dn_neigh_seq_ops); 589 if (rc) 590 goto out_kfree; 591 592 seq = file->private_data; 593 seq->private = s; 594 memset(s, 0, sizeof(*s)); 595out: 596 return rc; 597out_kfree: 598 kfree(s); 599 goto out; 600} 601 602static struct file_operations dn_neigh_seq_fops = { 603 .owner = THIS_MODULE, 604 .open = dn_neigh_seq_open, 605 .read = seq_read, 606 .llseek = seq_lseek, 607 .release = seq_release_private, 608}; 609 610#endif 611 612void __init dn_neigh_init(void) 613{ 614 neigh_table_init(&dn_neigh_table); 615 proc_net_fops_create("decnet_neigh", S_IRUGO, &dn_neigh_seq_fops); 616} 617 618void __exit dn_neigh_cleanup(void) 619{ 620 proc_net_remove("decnet_neigh"); 621 neigh_table_clear(&dn_neigh_table); 622} 623