| 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 flowi_oif; |
| 15 | int flowi_iif; |
| 16 | __u32 flowi_mark; |
| 17 | __u8 flowi_tos; |
| 18 | __u8 flowi_scope; |
| 19 | __u8 flowi_proto; |
| 20 | __u8 flowi_flags; |
| 21 | #define FLOWI_FLAG_ANYSRC 0x01 |
| 22 | #define FLOWI_FLAG_PRECOW_METRICS 0x02 |
| 23 | #define FLOWI_FLAG_CAN_SLEEP 0x04 |
| 24 | __u32 flowi_secid; |
| 25 | |
| 26 | union { |
| 27 | struct { |
| 28 | __be32 daddr; |
| 29 | __be32 saddr; |
| 30 | } ip4_u; |
| 31 | |
| 32 | struct { |
| 33 | struct in6_addr daddr; |
| 34 | struct in6_addr saddr; |
| 35 | __be32 flowlabel; |
| 36 | } ip6_u; |
| 37 | |
| 38 | struct { |
| 39 | __le16 daddr; |
| 40 | __le16 saddr; |
| 41 | __u8 scope; |
| 42 | } dn_u; |
| 43 | } nl_u; |
| 44 | #define fld_dst nl_u.dn_u.daddr |
| 45 | #define fld_src nl_u.dn_u.saddr |
| 46 | #define fld_scope nl_u.dn_u.scope |
| 47 | #define fl6_dst nl_u.ip6_u.daddr |
| 48 | #define fl6_src nl_u.ip6_u.saddr |
| 49 | #define fl6_flowlabel nl_u.ip6_u.flowlabel |
| 50 | #define fl4_dst nl_u.ip4_u.daddr |
| 51 | #define fl4_src nl_u.ip4_u.saddr |
| 52 | #define fl4_tos flowi_tos |
| 53 | #define fl4_scope flowi_scope |
| 54 | |
| 55 | union { |
| 56 | struct { |
| 57 | __be16 sport; |
| 58 | __be16 dport; |
| 59 | } ports; |
| 60 | |
| 61 | struct { |
| 62 | __u8 type; |
| 63 | __u8 code; |
| 64 | } icmpt; |
| 65 | |
| 66 | struct { |
| 67 | __le16 sport; |
| 68 | __le16 dport; |
| 69 | } dnports; |
| 70 | |
| 71 | __be32 spi; |
| 72 | __be32 gre_key; |
| 73 | |
| 74 | struct { |
| 75 | __u8 type; |
| 76 | } mht; |
| 77 | } uli_u; |
| 78 | #define fl_ip_sport uli_u.ports.sport |
| 79 | #define fl_ip_dport uli_u.ports.dport |
| 80 | #define fl_icmp_type uli_u.icmpt.type |
| 81 | #define fl_icmp_code uli_u.icmpt.code |
| 82 | #define fl_ipsec_spi uli_u.spi |
| 83 | #define fl_mh_type uli_u.mht.type |
| 84 | #define fl_gre_key uli_u.gre_key |
| 85 | } __attribute__((__aligned__(BITS_PER_LONG/8))); |
| 86 | |
| 87 | #define FLOW_DIR_IN 0 |
| 88 | #define FLOW_DIR_OUT 1 |
| 89 | #define FLOW_DIR_FWD 2 |
| 90 | |
| 91 | struct net; |
| 92 | struct sock; |
| 93 | struct flow_cache_ops; |
| 94 | |
| 95 | struct flow_cache_object { |
| 96 | const struct flow_cache_ops *ops; |
| 97 | }; |
| 98 | |
| 99 | struct flow_cache_ops { |
| 100 | struct flow_cache_object *(*get)(struct flow_cache_object *); |
| 101 | int (*check)(struct flow_cache_object *); |
| 102 | void (*delete)(struct flow_cache_object *); |
| 103 | }; |
| 104 | |
| 105 | typedef struct flow_cache_object *(*flow_resolve_t)( |
| 106 | struct net *net, const struct flowi *key, u16 family, |
| 107 | u8 dir, struct flow_cache_object *oldobj, void *ctx); |
| 108 | |
| 109 | extern struct flow_cache_object *flow_cache_lookup( |
| 110 | struct net *net, const struct flowi *key, u16 family, |
| 111 | u8 dir, flow_resolve_t resolver, void *ctx); |
| 112 | |
| 113 | extern void flow_cache_flush(void); |
| 114 | extern atomic_t flow_cache_genid; |
| 115 | |
| 116 | static inline int flow_cache_uli_match(const struct flowi *fl1, |
| 117 | const struct flowi *fl2) |
| 118 | { |
| 119 | return (fl1->flowi_proto == fl2->flowi_proto && |
| 120 | !memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u))); |
| 121 | } |
| 122 | |
| 123 | #endif |