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 17 union { 18 struct { 19 __u32 daddr; 20 __u32 saddr; 21 __u32 fwmark; 22 __u8 tos; 23 __u8 scope; 24 } ip4_u; 25 26 struct { 27 struct in6_addr daddr; 28 struct in6_addr saddr; 29 __u32 flowlabel; 30 } ip6_u; 31 32 struct { 33 __u16 daddr; 34 __u16 saddr; 35 __u32 fwmark; 36 __u8 scope; 37 } dn_u; 38 } nl_u; 39 #define fld_dst nl_u.dn_u.daddr 40 #define fld_src nl_u.dn_u.saddr 41 #define fld_fwmark nl_u.dn_u.fwmark 42 #define fld_scope nl_u.dn_u.scope 43 #define fl6_dst nl_u.ip6_u.daddr 44 #define fl6_src nl_u.ip6_u.saddr 45 #define fl6_flowlabel nl_u.ip6_u.flowlabel 46 #define fl4_dst nl_u.ip4_u.daddr 47 #define fl4_src nl_u.ip4_u.saddr 48 #define fl4_fwmark nl_u.ip4_u.fwmark 49 #define fl4_tos nl_u.ip4_u.tos 50 #define fl4_scope nl_u.ip4_u.scope 51 52 __u8 proto; 53 __u8 flags; 54 #define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01 55 union { 56 struct { 57 __u16 sport; 58 __u16 dport; 59 } ports; 60 61 struct { 62 __u8 type; 63 __u8 code; 64 } icmpt; 65 66 struct { 67 __u16 sport; 68 __u16 dport; 69 __u8 objnum; 70 __u8 objnamel; /* Not 16 bits since max val is 16 */ 71 __u8 objname[16]; /* Not zero terminated */ 72 } dnports; 73 74 __u32 spi; 75 } uli_u; 76 #define fl_ip_sport uli_u.ports.sport 77 #define fl_ip_dport uli_u.ports.dport 78 #define fl_icmp_type uli_u.icmpt.type 79 #define fl_icmp_code uli_u.icmpt.code 80 #define fl_ipsec_spi uli_u.spi 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 typedef void (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir, 88 void **objp, atomic_t **obj_refp); 89 90 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir, 91 flow_resolve_t resolver); 92 extern void flow_cache_flush(void); 93 extern atomic_t flow_cache_genid; 94 95 #endif 96