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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 action API for classifiers/qdiscs
  6 */
  7 
  8 #include <net/sch_generic.h>
  9 #include <net/pkt_sched.h>
 10 #include <net/net_namespace.h>
 11 #include <net/netns/generic.h>
 12 
 13 
 14 struct tcf_hashinfo {
 15         struct hlist_head       *htab;
 16         unsigned int            hmask;
 17         spinlock_t              lock;
 18         u32                     index;
 19 };
 20 
 21 struct tc_action_ops;
 22 
 23 struct tc_action {
 24         const struct tc_action_ops      *ops;
 25         __u32                           type; /* for backward compat(TCA_OLD_COMPAT) */
 26         __u32                           order;
 27         struct list_head                list;
 28         struct tcf_hashinfo             *hinfo;
 29 
 30         struct hlist_node               tcfa_head;
 31         u32                             tcfa_index;
 32         int                             tcfa_refcnt;
 33         int                             tcfa_bindcnt;
 34         u32                             tcfa_capab;
 35         int                             tcfa_action;
 36         struct tcf_t                    tcfa_tm;
 37         struct gnet_stats_basic_packed  tcfa_bstats;
 38         struct gnet_stats_queue         tcfa_qstats;
 39         struct net_rate_estimator __rcu *tcfa_rate_est;
 40         spinlock_t                      tcfa_lock;
 41         struct rcu_head                 tcfa_rcu;
 42         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
 43         struct gnet_stats_queue __percpu *cpu_qstats;
 44 };
 45 #define tcf_head        common.tcfa_head
 46 #define tcf_index       common.tcfa_index
 47 #define tcf_refcnt      common.tcfa_refcnt
 48 #define tcf_bindcnt     common.tcfa_bindcnt
 49 #define tcf_capab       common.tcfa_capab
 50 #define tcf_action      common.tcfa_action
 51 #define tcf_tm          common.tcfa_tm
 52 #define tcf_bstats      common.tcfa_bstats
 53 #define tcf_qstats      common.tcfa_qstats
 54 #define tcf_rate_est    common.tcfa_rate_est
 55 #define tcf_lock        common.tcfa_lock
 56 #define tcf_rcu         common.tcfa_rcu
 57 
 58 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
 59 {
 60         return index & hmask;
 61 }
 62 
 63 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
 64 {
 65         int i;
 66 
 67         spin_lock_init(&hf->lock);
 68         hf->index = 0;
 69         hf->hmask = mask;
 70         hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
 71                            GFP_KERNEL);
 72         if (!hf->htab)
 73                 return -ENOMEM;
 74         for (i = 0; i < mask + 1; i++)
 75                 INIT_HLIST_HEAD(&hf->htab[i]);
 76         return 0;
 77 }
 78 
 79 /* Update lastuse only if needed, to avoid dirtying a cache line.
 80  * We use a temp variable to avoid fetching jiffies twice.
 81  */
 82 static inline void tcf_lastuse_update(struct tcf_t *tm)
 83 {
 84         unsigned long now = jiffies;
 85 
 86         if (tm->lastuse != now)
 87                 tm->lastuse = now;
 88         if (unlikely(!tm->firstuse))
 89                 tm->firstuse = now;
 90 }
 91 
 92 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
 93 {
 94         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
 95         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
 96         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
 97         dtm->expires = jiffies_to_clock_t(stm->expires);
 98 }
 99 
100 #ifdef CONFIG_NET_CLS_ACT
101 
102 #define ACT_P_CREATED 1
103 #define ACT_P_DELETED 1
104 
105 struct tc_action_ops {
106         struct list_head head;
107         char    kind[IFNAMSIZ];
108         __u32   type; /* TBD to match kind */
109         size_t  size;
110         struct module           *owner;
111         int     (*act)(struct sk_buff *, const struct tc_action *,
112                        struct tcf_result *);
113         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
114         void    (*cleanup)(struct tc_action *, int bind);
115         int     (*lookup)(struct net *, struct tc_action **, u32);
116         int     (*init)(struct net *net, struct nlattr *nla,
117                         struct nlattr *est, struct tc_action **act, int ovr,
118                         int bind);
119         int     (*walk)(struct net *, struct sk_buff *,
120                         struct netlink_callback *, int, const struct tc_action_ops *);
121         void    (*stats_update)(struct tc_action *, u64, u32, u64);
122         int     (*get_dev)(const struct tc_action *a, struct net *net,
123                            struct net_device **mirred_dev);
124 };
125 
126 struct tc_action_net {
127         struct tcf_hashinfo *hinfo;
128         const struct tc_action_ops *ops;
129 };
130 
131 static inline
132 int tc_action_net_init(struct tc_action_net *tn,
133                        const struct tc_action_ops *ops, unsigned int mask)
134 {
135         int err = 0;
136 
137         tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL);
138         if (!tn->hinfo)
139                 return -ENOMEM;
140         tn->ops = ops;
141         err = tcf_hashinfo_init(tn->hinfo, mask);
142         if (err)
143                 kfree(tn->hinfo);
144         return err;
145 }
146 
147 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
148                           struct tcf_hashinfo *hinfo);
149 
150 static inline void tc_action_net_exit(struct tc_action_net *tn)
151 {
152         tcf_hashinfo_destroy(tn->ops, tn->hinfo);
153         kfree(tn->hinfo);
154 }
155 
156 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
157                        struct netlink_callback *cb, int type,
158                        const struct tc_action_ops *ops);
159 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
160 u32 tcf_hash_new_index(struct tc_action_net *tn);
161 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
162                     int bind);
163 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
164                     struct tc_action **a, const struct tc_action_ops *ops, int bind,
165                     bool cpustats);
166 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
167 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a);
168 
169 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
170 
171 static inline int tcf_hash_release(struct tc_action *a, bool bind)
172 {
173         return __tcf_hash_release(a, bind, false);
174 }
175 
176 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
177 int tcf_unregister_action(struct tc_action_ops *a,
178                           struct pernet_operations *ops);
179 int tcf_action_destroy(struct list_head *actions, int bind);
180 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
181                     int nr_actions, struct tcf_result *res);
182 int tcf_action_init(struct net *net, struct nlattr *nla,
183                                   struct nlattr *est, char *n, int ovr,
184                                   int bind, struct list_head *);
185 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
186                                     struct nlattr *est, char *n, int ovr,
187                                     int bind);
188 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
189 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
190 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
191 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
192 
193 #endif /* CONFIG_NET_CLS_ACT */
194 
195 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
196                                            u64 packets, u64 lastuse)
197 {
198 #ifdef CONFIG_NET_CLS_ACT
199         if (!a->ops->stats_update)
200                 return;
201 
202         a->ops->stats_update(a, bytes, packets, lastuse);
203 #endif
204 }
205 
206 #endif
207 

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