1/* 2 * 3 * Generic internet FLOW. 4 * 5 */ 6 7#ifndef _NET_FLOW_H 8#define _NET_FLOW_H 9 10#include <linux/socket.h> 11#include <linux/in6.h> 12#include <linux/atomic.h> 13 14struct flowi_common { 15 int flowic_oif; 16 int flowic_iif; 17 __u32 flowic_mark; 18 __u8 flowic_tos; 19 __u8 flowic_scope; 20 __u8 flowic_proto; 21 __u8 flowic_flags; 22#define FLOWI_FLAG_ANYSRC 0x01 23#define FLOWI_FLAG_PRECOW_METRICS 0x02 24#define FLOWI_FLAG_CAN_SLEEP 0x04 25 __u32 flowic_secid; 26}; 27 28union flowi_uli { 29 struct { 30 __be16 dport; 31 __be16 sport; 32 } ports; 33 34 struct { 35 __u8 type; 36 __u8 code; 37 } icmpt; 38 39 struct { 40 __le16 dport; 41 __le16 sport; 42 } dnports; 43 44 __be32 spi; 45 __be32 gre_key; 46 47 struct { 48 __u8 type; 49 } mht; 50}; 51 52struct flowi4 { 53 struct flowi_common __fl_common; 54#define flowi4_oif __fl_common.flowic_oif 55#define flowi4_iif __fl_common.flowic_iif 56#define flowi4_mark __fl_common.flowic_mark 57#define flowi4_tos __fl_common.flowic_tos 58#define flowi4_scope __fl_common.flowic_scope 59#define flowi4_proto __fl_common.flowic_proto 60#define flowi4_flags __fl_common.flowic_flags 61#define flowi4_secid __fl_common.flowic_secid 62 63 /* (saddr,daddr) must be grouped, same order as in IP header */ 64 __be32 saddr; 65 __be32 daddr; 66 67 union flowi_uli uli; 68#define fl4_sport uli.ports.sport 69#define fl4_dport uli.ports.dport 70#define fl4_icmp_type uli.icmpt.type 71#define fl4_icmp_code uli.icmpt.code 72#define fl4_ipsec_spi uli.spi 73#define fl4_mh_type uli.mht.type 74#define fl4_gre_key uli.gre_key 75} __attribute__((__aligned__(BITS_PER_LONG/8))); 76 77static inline void flowi4_init_output(struct flowi4 *fl4, int oif, 78 __u32 mark, __u8 tos, __u8 scope, 79 __u8 proto, __u8 flags, 80 __be32 daddr, __be32 saddr, 81 __be16 dport, __be16 sport) 82{ 83 fl4->flowi4_oif = oif; 84 fl4->flowi4_iif = 0; 85 fl4->flowi4_mark = mark; 86 fl4->flowi4_tos = tos; 87 fl4->flowi4_scope = scope; 88 fl4->flowi4_proto = proto; 89 fl4->flowi4_flags = flags; 90 fl4->flowi4_secid = 0; 91 fl4->daddr = daddr; 92 fl4->saddr = saddr; 93 fl4->fl4_dport = dport; 94 fl4->fl4_sport = sport; 95} 96 97/* Reset some input parameters after previous lookup */ 98static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, 99 __be32 daddr, __be32 saddr) 100{ 101 fl4->flowi4_oif = oif; 102 fl4->flowi4_tos = tos; 103 fl4->daddr = daddr; 104 fl4->saddr = saddr; 105} 106 107 108struct flowi6 { 109 struct flowi_common __fl_common; 110#define flowi6_oif __fl_common.flowic_oif 111#define flowi6_iif __fl_common.flowic_iif 112#define flowi6_mark __fl_common.flowic_mark 113#define flowi6_tos __fl_common.flowic_tos 114#define flowi6_scope __fl_common.flowic_scope 115#define flowi6_proto __fl_common.flowic_proto 116#define flowi6_flags __fl_common.flowic_flags 117#define flowi6_secid __fl_common.flowic_secid 118 struct in6_addr daddr; 119 struct in6_addr saddr; 120 __be32 flowlabel; 121 union flowi_uli uli; 122#define fl6_sport uli.ports.sport 123#define fl6_dport uli.ports.dport 124#define fl6_icmp_type uli.icmpt.type 125#define fl6_icmp_code uli.icmpt.code 126#define fl6_ipsec_spi uli.spi 127#define fl6_mh_type uli.mht.type 128#define fl6_gre_key uli.gre_key 129} __attribute__((__aligned__(BITS_PER_LONG/8))); 130 131struct flowidn { 132 struct flowi_common __fl_common; 133#define flowidn_oif __fl_common.flowic_oif 134#define flowidn_iif __fl_common.flowic_iif 135#define flowidn_mark __fl_common.flowic_mark 136#define flowidn_scope __fl_common.flowic_scope 137#define flowidn_proto __fl_common.flowic_proto 138#define flowidn_flags __fl_common.flowic_flags 139 __le16 daddr; 140 __le16 saddr; 141 union flowi_uli uli; 142#define fld_sport uli.ports.sport 143#define fld_dport uli.ports.dport 144} __attribute__((__aligned__(BITS_PER_LONG/8))); 145 146struct flowi { 147 union { 148 struct flowi_common __fl_common; 149 struct flowi4 ip4; 150 struct flowi6 ip6; 151 struct flowidn dn; 152 } u; 153#define flowi_oif u.__fl_common.flowic_oif 154#define flowi_iif u.__fl_common.flowic_iif 155#define flowi_mark u.__fl_common.flowic_mark 156#define flowi_tos u.__fl_common.flowic_tos 157#define flowi_scope u.__fl_common.flowic_scope 158#define flowi_proto u.__fl_common.flowic_proto 159#define flowi_flags u.__fl_common.flowic_flags 160#define flowi_secid u.__fl_common.flowic_secid 161} __attribute__((__aligned__(BITS_PER_LONG/8))); 162 163static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) 164{ 165 return container_of(fl4, struct flowi, u.ip4); 166} 167 168static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) 169{ 170 return container_of(fl6, struct flowi, u.ip6); 171} 172 173static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) 174{ 175 return container_of(fldn, struct flowi, u.dn); 176} 177 178typedef unsigned long flow_compare_t; 179 180static inline size_t flow_key_size(u16 family) 181{ 182 switch (family) { 183 case AF_INET: 184 BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); 185 return sizeof(struct flowi4) / sizeof(flow_compare_t); 186 case AF_INET6: 187 BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); 188 return sizeof(struct flowi6) / sizeof(flow_compare_t); 189 case AF_DECnet: 190 BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); 191 return sizeof(struct flowidn) / sizeof(flow_compare_t); 192 } 193 return 0; 194} 195 196#define FLOW_DIR_IN 0 197#define FLOW_DIR_OUT 1 198#define FLOW_DIR_FWD 2 199 200struct net; 201struct sock; 202struct flow_cache_ops; 203 204struct flow_cache_object { 205 const struct flow_cache_ops *ops; 206}; 207 208struct flow_cache_ops { 209 struct flow_cache_object *(*get)(struct flow_cache_object *); 210 int (*check)(struct flow_cache_object *); 211 void (*delete)(struct flow_cache_object *); 212}; 213 214typedef struct flow_cache_object *(*flow_resolve_t)( 215 struct net *net, const struct flowi *key, u16 family, 216 u8 dir, struct flow_cache_object *oldobj, void *ctx); 217 218extern struct flow_cache_object *flow_cache_lookup( 219 struct net *net, const struct flowi *key, u16 family, 220 u8 dir, flow_resolve_t resolver, void *ctx); 221 222extern void flow_cache_flush(void); 223extern void flow_cache_flush_deferred(void); 224extern atomic_t flow_cache_genid; 225 226#endif 227