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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 gnet_stats_rate_est64    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_act         common.tcfa_act
 46 #define tcf_head        common.tcfa_head
 47 #define tcf_index       common.tcfa_index
 48 #define tcf_refcnt      common.tcfa_refcnt
 49 #define tcf_bindcnt     common.tcfa_bindcnt
 50 #define tcf_capab       common.tcfa_capab
 51 #define tcf_action      common.tcfa_action
 52 #define tcf_tm          common.tcfa_tm
 53 #define tcf_bstats      common.tcfa_bstats
 54 #define tcf_qstats      common.tcfa_qstats
 55 #define tcf_rate_est    common.tcfa_rate_est
 56 #define tcf_lock        common.tcfa_lock
 57 #define tcf_rcu         common.tcfa_rcu
 58 
 59 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
 60 {
 61         return index & hmask;
 62 }
 63 
 64 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
 65 {
 66         int i;
 67 
 68         spin_lock_init(&hf->lock);
 69         hf->index = 0;
 70         hf->hmask = mask;
 71         hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
 72                            GFP_KERNEL);
 73         if (!hf->htab)
 74                 return -ENOMEM;
 75         for (i = 0; i < mask + 1; i++)
 76                 INIT_HLIST_HEAD(&hf->htab[i]);
 77         return 0;
 78 }
 79 
 80 /* Update lastuse only if needed, to avoid dirtying a cache line.
 81  * We use a temp variable to avoid fetching jiffies twice.
 82  */
 83 static inline void tcf_lastuse_update(struct tcf_t *tm)
 84 {
 85         unsigned long now = jiffies;
 86 
 87         if (tm->lastuse != now)
 88                 tm->lastuse = now;
 89         if (unlikely(!tm->firstuse))
 90                 tm->firstuse = now;
 91 }
 92 
 93 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
 94 {
 95         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
 96         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
 97         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
 98         dtm->expires = jiffies_to_clock_t(stm->expires);
 99 }
100 
101 #ifdef CONFIG_NET_CLS_ACT
102 
103 #define ACT_P_CREATED 1
104 #define ACT_P_DELETED 1
105 
106 struct tc_action_ops {
107         struct list_head head;
108         char    kind[IFNAMSIZ];
109         __u32   type; /* TBD to match kind */
110         size_t  size;
111         struct module           *owner;
112         int     (*act)(struct sk_buff *, const struct tc_action *,
113                        struct tcf_result *);
114         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
115         void    (*cleanup)(struct tc_action *, int bind);
116         int     (*lookup)(struct net *, struct tc_action **, u32);
117         int     (*init)(struct net *net, struct nlattr *nla,
118                         struct nlattr *est, struct tc_action **act, int ovr,
119                         int bind);
120         int     (*walk)(struct net *, struct sk_buff *,
121                         struct netlink_callback *, int, const struct tc_action_ops *);
122         void    (*stats_update)(struct tc_action *, u64, u32, u64);
123 };
124 
125 struct tc_action_net {
126         struct tcf_hashinfo *hinfo;
127         const struct tc_action_ops *ops;
128 };
129 
130 static inline
131 int tc_action_net_init(struct tc_action_net *tn,
132                        const struct tc_action_ops *ops, unsigned int mask)
133 {
134         int err = 0;
135 
136         tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL);
137         if (!tn->hinfo)
138                 return -ENOMEM;
139         tn->ops = ops;
140         err = tcf_hashinfo_init(tn->hinfo, mask);
141         if (err)
142                 kfree(tn->hinfo);
143         return err;
144 }
145 
146 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
147                           struct tcf_hashinfo *hinfo);
148 
149 static inline void tc_action_net_exit(struct tc_action_net *tn)
150 {
151         tcf_hashinfo_destroy(tn->ops, tn->hinfo);
152         kfree(tn->hinfo);
153 }
154 
155 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
156                        struct netlink_callback *cb, int type,
157                        const struct tc_action_ops *ops);
158 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
159 u32 tcf_hash_new_index(struct tc_action_net *tn);
160 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
161                     int bind);
162 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
163                     struct tc_action **a, const struct tc_action_ops *ops, int bind,
164                     bool cpustats);
165 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
166 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a);
167 
168 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
169 
170 static inline int tcf_hash_release(struct tc_action *a, bool bind)
171 {
172         return __tcf_hash_release(a, bind, false);
173 }
174 
175 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
176 int tcf_unregister_action(struct tc_action_ops *a,
177                           struct pernet_operations *ops);
178 int tcf_action_destroy(struct list_head *actions, int bind);
179 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
180                     int nr_actions, struct tcf_result *res);
181 int tcf_action_init(struct net *net, struct nlattr *nla,
182                                   struct nlattr *est, char *n, int ovr,
183                                   int bind, struct list_head *);
184 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
185                                     struct nlattr *est, char *n, int ovr,
186                                     int bind);
187 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
188 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
189 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
190 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
191 
192 #endif /* CONFIG_NET_CLS_ACT */
193 
194 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
195                                            u64 packets, u64 lastuse)
196 {
197 #ifdef CONFIG_NET_CLS_ACT
198         if (!a->ops->stats_update)
199                 return;
200 
201         a->ops->stats_update(a, bytes, packets, lastuse);
202 #endif
203 }
204 
205 #endif
206 

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