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TOMOYO Linux Cross Reference
Linux/include/net/act_api.h

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  1 #ifndef __NET_ACT_API_H
  2 #define __NET_ACT_API_H
  3 
  4 /*
  5  * Public police action API for classifiers/qdiscs
  6  */
  7 
  8 #include <net/sch_generic.h>
  9 #include <net/pkt_sched.h>
 10 
 11 struct tcf_common {
 12         struct hlist_node               tcfc_head;
 13         u32                             tcfc_index;
 14         int                             tcfc_refcnt;
 15         int                             tcfc_bindcnt;
 16         u32                             tcfc_capab;
 17         int                             tcfc_action;
 18         struct tcf_t                    tcfc_tm;
 19         struct gnet_stats_basic_packed  tcfc_bstats;
 20         struct gnet_stats_queue         tcfc_qstats;
 21         struct gnet_stats_rate_est64    tcfc_rate_est;
 22         spinlock_t                      tcfc_lock;
 23         struct rcu_head                 tcfc_rcu;
 24         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
 25         struct gnet_stats_queue __percpu *cpu_qstats;
 26 };
 27 #define tcf_head        common.tcfc_head
 28 #define tcf_index       common.tcfc_index
 29 #define tcf_refcnt      common.tcfc_refcnt
 30 #define tcf_bindcnt     common.tcfc_bindcnt
 31 #define tcf_capab       common.tcfc_capab
 32 #define tcf_action      common.tcfc_action
 33 #define tcf_tm          common.tcfc_tm
 34 #define tcf_bstats      common.tcfc_bstats
 35 #define tcf_qstats      common.tcfc_qstats
 36 #define tcf_rate_est    common.tcfc_rate_est
 37 #define tcf_lock        common.tcfc_lock
 38 #define tcf_rcu         common.tcfc_rcu
 39 
 40 struct tcf_hashinfo {
 41         struct hlist_head       *htab;
 42         unsigned int            hmask;
 43         spinlock_t              lock;
 44         u32                     index;
 45 };
 46 
 47 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
 48 {
 49         return index & hmask;
 50 }
 51 
 52 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
 53 {
 54         int i;
 55 
 56         spin_lock_init(&hf->lock);
 57         hf->index = 0;
 58         hf->hmask = mask;
 59         hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
 60                            GFP_KERNEL);
 61         if (!hf->htab)
 62                 return -ENOMEM;
 63         for (i = 0; i < mask + 1; i++)
 64                 INIT_HLIST_HEAD(&hf->htab[i]);
 65         return 0;
 66 }
 67 
 68 static inline void tcf_hashinfo_destroy(struct tcf_hashinfo *hf)
 69 {
 70         kfree(hf->htab);
 71 }
 72 
 73 /* Update lastuse only if needed, to avoid dirtying a cache line.
 74  * We use a temp variable to avoid fetching jiffies twice.
 75  */
 76 static inline void tcf_lastuse_update(struct tcf_t *tm)
 77 {
 78         unsigned long now = jiffies;
 79 
 80         if (tm->lastuse != now)
 81                 tm->lastuse = now;
 82 }
 83 
 84 #ifdef CONFIG_NET_CLS_ACT
 85 
 86 #define ACT_P_CREATED 1
 87 #define ACT_P_DELETED 1
 88 
 89 struct tc_action {
 90         void                    *priv;
 91         const struct tc_action_ops      *ops;
 92         __u32                   type; /* for backward compat(TCA_OLD_COMPAT) */
 93         __u32                   order;
 94         struct list_head        list;
 95 };
 96 
 97 struct tc_action_ops {
 98         struct list_head head;
 99         struct tcf_hashinfo *hinfo;
100         char    kind[IFNAMSIZ];
101         __u32   type; /* TBD to match kind */
102         struct module           *owner;
103         int     (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *);
104         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
105         void    (*cleanup)(struct tc_action *, int bind);
106         int     (*lookup)(struct tc_action *, u32);
107         int     (*init)(struct net *net, struct nlattr *nla,
108                         struct nlattr *est, struct tc_action *act, int ovr,
109                         int bind);
110         int     (*walk)(struct sk_buff *, struct netlink_callback *, int, struct tc_action *);
111 };
112 
113 int tcf_hash_search(struct tc_action *a, u32 index);
114 u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo);
115 int tcf_hash_check(u32 index, struct tc_action *a, int bind);
116 int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
117                     int size, int bind, bool cpustats);
118 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
119 void tcf_hash_insert(struct tc_action *a);
120 
121 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
122 
123 static inline int tcf_hash_release(struct tc_action *a, bool bind)
124 {
125         return __tcf_hash_release(a, bind, false);
126 }
127 
128 int tcf_register_action(struct tc_action_ops *a, unsigned int mask);
129 int tcf_unregister_action(struct tc_action_ops *a);
130 int tcf_action_destroy(struct list_head *actions, int bind);
131 int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
132                     struct tcf_result *res);
133 int tcf_action_init(struct net *net, struct nlattr *nla,
134                                   struct nlattr *est, char *n, int ovr,
135                                   int bind, struct list_head *);
136 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
137                                     struct nlattr *est, char *n, int ovr,
138                                     int bind);
139 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
140 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
141 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
142 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
143 #endif /* CONFIG_NET_CLS_ACT */
144 #endif
145 

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