LXR linux/include/net/fib

   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
  11struct 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
  34struct 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
  42struct 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
  93static inline void fib_rule_get(struct fib_rule *rule)
  94{
  95        atomic_inc(&rule->refcnt);
  96}
  97
  98static 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
 105static 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
 111static 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
 118extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
 119extern void fib_rules_unregister(struct fib_rules_ops *);
 120
 121extern int                      fib_rules_lookup(struct fib_rules_ops *,
 122                                                 struct flowi *, int flags,
 123                                                 struct fib_lookup_arg *);
 124extern int                      fib_default_rule_add(struct fib_rules_ops *,
 125                                                     u32 pref, u32 table,
 126                                                     u32 flags);
 127extern u32                      fib_default_rule_pref(struct fib_rules_ops *ops);
 128#endif
 129