1 /* 2 * 3 * Generic internet FLOW. 4 * 5 */ 6 7 #ifndef _NET_FLOW_H 8 #define _NET_FLOW_H 9 10 #include <linux/in6.h> 11 #include <asm/atomic.h> 12 13 struct flowi { 14 int oif; 15 int iif; 16 __u32 mark; 17 18 union { 19 struct { 20 __be32 daddr; 21 __be32 saddr; 22 __u8 tos; 23 __u8 scope; 24 } ip4_u; 25 26 struct { 27 struct in6_addr daddr; 28 struct in6_addr saddr; 29 __be32 flowlabel; 30 } ip6_u; 31 32 struct { 33 __le16 daddr; 34 __le16 saddr; 35 __u8 scope; 36 } dn_u; 37 } nl_u; 38 #define fld_dst nl_u.dn_u.daddr 39 #define fld_src nl_u.dn_u.saddr 40 #define fld_scope nl_u.dn_u.scope 41 #define fl6_dst nl_u.ip6_u.daddr 42 #define fl6_src nl_u.ip6_u.saddr 43 #define fl6_flowlabel nl_u.ip6_u.flowlabel 44 #define fl4_dst nl_u.ip4_u.daddr 45 #define fl4_src nl_u.ip4_u.saddr 46 #define fl4_tos nl_u.ip4_u.tos 47 #define fl4_scope nl_u.ip4_u.scope 48 49 __u8 proto; 50 __u8 flags; 51 #define FLOWI_FLAG_ANYSRC 0x01 52 union { 53 struct { 54 __be16 sport; 55 __be16 dport; 56 } ports; 57 58 struct { 59 __u8 type; 60 __u8 code; 61 } icmpt; 62 63 struct { 64 __le16 sport; 65 __le16 dport; 66 } dnports; 67 68 __be32 spi; 69 70 struct { 71 __u8 type; 72 } mht; 73 } uli_u; 74 #define fl_ip_sport uli_u.ports.sport 75 #define fl_ip_dport uli_u.ports.dport 76 #define fl_icmp_type uli_u.icmpt.type 77 #define fl_icmp_code uli_u.icmpt.code 78 #define fl_ipsec_spi uli_u.spi 79 #define fl_mh_type uli_u.mht.type 80 __u32 secid; /* used by xfrm; see secid.txt */ 81 } __attribute__((__aligned__(BITS_PER_LONG/8))); 82 83 #define FLOW_DIR_IN 0 84 #define FLOW_DIR_OUT 1 85 #define FLOW_DIR_FWD 2 86 87 struct net; 88 struct sock; 89 struct flow_cache_ops; 90 91 struct flow_cache_object { 92 const struct flow_cache_ops *ops; 93 }; 94 95 struct flow_cache_ops { 96 struct flow_cache_object *(*get)(struct flow_cache_object *); 97 int (*check)(struct flow_cache_object *); 98 void (*delete)(struct flow_cache_object *); 99 }; 100 101 typedef struct flow_cache_object *(*flow_resolve_t)( 102 struct net *net, struct flowi *key, u16 family, 103 u8 dir, struct flow_cache_object *oldobj, void *ctx); 104 105 extern struct flow_cache_object *flow_cache_lookup( 106 struct net *net, struct flowi *key, u16 family, 107 u8 dir, flow_resolve_t resolver, void *ctx); 108 109 extern void flow_cache_flush(void); 110 extern atomic_t flow_cache_genid; 111 112 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2) 113 { 114 return (fl1->proto == fl2->proto && 115 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u))); 116 } 117 118 #endif 119