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 union { 51 struct { 52 __be16 sport; 53 __be16 dport; 54 } ports; 55 56 struct { 57 __u8 type; 58 __u8 code; 59 } icmpt; 60 61 struct { 62 __le16 sport; 63 __le16 dport; 64 } dnports; 65 66 __be32 spi; 67 68 struct { 69 __u8 type; 70 } mht; 71 } uli_u; 72 #define fl_ip_sport uli_u.ports.sport 73 #define fl_ip_dport uli_u.ports.dport 74 #define fl_icmp_type uli_u.icmpt.type 75 #define fl_icmp_code uli_u.icmpt.code 76 #define fl_ipsec_spi uli_u.spi 77 #define fl_mh_type uli_u.mht.type 78 __u32 secid; /* used by xfrm; see secid.txt */ 79 } __attribute__((__aligned__(BITS_PER_LONG/8))); 80 81 #define FLOW_DIR_IN 0 82 #define FLOW_DIR_OUT 1 83 #define FLOW_DIR_FWD 2 84 85 struct sock; 86 typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir, 87 void **objp, atomic_t **obj_refp); 88 89 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir, 90 flow_resolve_t resolver); 91 extern void flow_cache_flush(void); 92 extern atomic_t flow_cache_genid; 93 94 static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2) 95 { 96 return (fl1->proto == fl2->proto && 97 !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u))); 98 } 99 100 #endif 101