| 1 | #ifndef __NET_FIB_RULES_H |
| 2 | #define __NET_FIB_RULES_H |
| 3 | |
| 4 | #include <linux/types.h> |
| 5 | #include <linux/slab.h> |
| 6 | #include <linux/netdevice.h> |
| 7 | #include <linux/fib_rules.h> |
| 8 | #include <net/flow.h> |
| 9 | #include <net/rtnetlink.h> |
| 10 | |
| 11 | struct fib_rule { |
| 12 | struct list_head list; |
| 13 | int iifindex; |
| 14 | int oifindex; |
| 15 | u32 mark; |
| 16 | u32 mark_mask; |
| 17 | u32 flags; |
| 18 | u32 table; |
| 19 | u8 action; |
| 20 | /* 3 bytes hole, try to use */ |
| 21 | u32 target; |
| 22 | struct fib_rule __rcu *ctarget; |
| 23 | struct net *fr_net; |
| 24 | |
| 25 | atomic_t refcnt; |
| 26 | u32 pref; |
| 27 | int suppress_ifgroup; |
| 28 | int suppress_prefixlen; |
| 29 | char iifname[IFNAMSIZ]; |
| 30 | char oifname[IFNAMSIZ]; |
| 31 | struct rcu_head rcu; |
| 32 | }; |
| 33 | |
| 34 | struct fib_lookup_arg { |
| 35 | void *lookup_ptr; |
| 36 | void *result; |
| 37 | struct fib_rule *rule; |
| 38 | int flags; |
| 39 | #define FIB_LOOKUP_NOREF 1 |
| 40 | }; |
| 41 | |
| 42 | struct fib_rules_ops { |
| 43 | int family; |
| 44 | struct list_head list; |
| 45 | int rule_size; |
| 46 | int addr_size; |
| 47 | int unresolved_rules; |
| 48 | int nr_goto_rules; |
| 49 | |
| 50 | int (*action)(struct fib_rule *, |
| 51 | struct flowi *, int, |
| 52 | struct fib_lookup_arg *); |
| 53 | bool (*suppress)(struct fib_rule *, |
| 54 | struct fib_lookup_arg *); |
| 55 | int (*match)(struct fib_rule *, |
| 56 | struct flowi *, int); |
| 57 | int (*configure)(struct fib_rule *, |
| 58 | struct sk_buff *, |
| 59 | struct fib_rule_hdr *, |
| 60 | struct nlattr **); |
| 61 | void (*delete)(struct fib_rule *); |
| 62 | int (*compare)(struct fib_rule *, |
| 63 | struct fib_rule_hdr *, |
| 64 | struct nlattr **); |
| 65 | int (*fill)(struct fib_rule *, struct sk_buff *, |
| 66 | struct fib_rule_hdr *); |
| 67 | u32 (*default_pref)(struct fib_rules_ops *ops); |
| 68 | size_t (*nlmsg_payload)(struct fib_rule *); |
| 69 | |
| 70 | /* Called after modifications to the rules set, must flush |
| 71 | * the route cache if one exists. */ |
| 72 | void (*flush_cache)(struct fib_rules_ops *ops); |
| 73 | |
| 74 | int nlgroup; |
| 75 | const struct nla_policy *policy; |
| 76 | struct list_head rules_list; |
| 77 | struct module *owner; |
| 78 | struct net *fro_net; |
| 79 | struct rcu_head rcu; |
| 80 | }; |
| 81 | |
| 82 | #define FRA_GENERIC_POLICY \ |
| 83 | [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ |
| 84 | [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ |
| 85 | [FRA_PRIORITY] = { .type = NLA_U32 }, \ |
| 86 | [FRA_FWMARK] = { .type = NLA_U32 }, \ |
| 87 | [FRA_FWMASK] = { .type = NLA_U32 }, \ |
| 88 | [FRA_TABLE] = { .type = NLA_U32 }, \ |
| 89 | [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ |
| 90 | [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ |
| 91 | [FRA_GOTO] = { .type = NLA_U32 } |
| 92 | |
| 93 | static inline void fib_rule_get(struct fib_rule *rule) |
| 94 | { |
| 95 | atomic_inc(&rule->refcnt); |
| 96 | } |
| 97 | |
| 98 | static inline void fib_rule_put_rcu(struct rcu_head *head) |
| 99 | { |
| 100 | struct fib_rule *rule = container_of(head, struct fib_rule, rcu); |
| 101 | release_net(rule->fr_net); |
| 102 | kfree(rule); |
| 103 | } |
| 104 | |
| 105 | static inline void fib_rule_put(struct fib_rule *rule) |
| 106 | { |
| 107 | if (atomic_dec_and_test(&rule->refcnt)) |
| 108 | call_rcu(&rule->rcu, fib_rule_put_rcu); |
| 109 | } |
| 110 | |
| 111 | static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) |
| 112 | { |
| 113 | if (nla[FRA_TABLE]) |
| 114 | return nla_get_u32(nla[FRA_TABLE]); |
| 115 | return frh->table; |
| 116 | } |
| 117 | |
| 118 | struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, |
| 119 | struct net *); |
| 120 | void fib_rules_unregister(struct fib_rules_ops *); |
| 121 | |
| 122 | int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, |
| 123 | struct fib_lookup_arg *); |
| 124 | int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, |
| 125 | u32 flags); |
| 126 | u32 fib_default_rule_pref(struct fib_rules_ops *ops); |
| 127 | #endif |