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 struct tc_cookie *act_cookie; 45 struct tcf_chain *goto_chain; 46 }; 47 #define tcf_head common.tcfa_head 48 #define tcf_index common.tcfa_index 49 #define tcf_refcnt common.tcfa_refcnt 50 #define tcf_bindcnt common.tcfa_bindcnt 51 #define tcf_capab common.tcfa_capab 52 #define tcf_action common.tcfa_action 53 #define tcf_tm common.tcfa_tm 54 #define tcf_bstats common.tcfa_bstats 55 #define tcf_qstats common.tcfa_qstats 56 #define tcf_rate_est common.tcfa_rate_est 57 #define tcf_lock common.tcfa_lock 58 #define tcf_rcu common.tcfa_rcu 59 60 static inline unsigned int tcf_hash(u32 index, unsigned int hmask) 61 { 62 return index & hmask; 63 } 64 65 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask) 66 { 67 int i; 68 69 spin_lock_init(&hf->lock); 70 hf->index = 0; 71 hf->hmask = mask; 72 hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head), 73 GFP_KERNEL); 74 if (!hf->htab) 75 return -ENOMEM; 76 for (i = 0; i < mask + 1; i++) 77 INIT_HLIST_HEAD(&hf->htab[i]); 78 return 0; 79 } 80 81 /* Update lastuse only if needed, to avoid dirtying a cache line. 82 * We use a temp variable to avoid fetching jiffies twice. 83 */ 84 static inline void tcf_lastuse_update(struct tcf_t *tm) 85 { 86 unsigned long now = jiffies; 87 88 if (tm->lastuse != now) 89 tm->lastuse = now; 90 if (unlikely(!tm->firstuse)) 91 tm->firstuse = now; 92 } 93 94 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 95 { 96 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 97 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 98 dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); 99 dtm->expires = jiffies_to_clock_t(stm->expires); 100 } 101 102 #ifdef CONFIG_NET_CLS_ACT 103 104 #define ACT_P_CREATED 1 105 #define ACT_P_DELETED 1 106 107 struct tc_action_ops { 108 struct list_head head; 109 char kind[IFNAMSIZ]; 110 __u32 type; /* TBD to match kind */ 111 size_t size; 112 struct module *owner; 113 int (*act)(struct sk_buff *, const struct tc_action *, 114 struct tcf_result *); 115 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 116 void (*cleanup)(struct tc_action *, int bind); 117 int (*lookup)(struct net *, struct tc_action **, u32); 118 int (*init)(struct net *net, struct nlattr *nla, 119 struct nlattr *est, struct tc_action **act, int ovr, 120 int bind); 121 int (*walk)(struct net *, struct sk_buff *, 122 struct netlink_callback *, int, const struct tc_action_ops *); 123 void (*stats_update)(struct tc_action *, u64, u32, u64); 124 int (*get_dev)(const struct tc_action *a, struct net *net, 125 struct net_device **mirred_dev); 126 }; 127 128 struct tc_action_net { 129 struct tcf_hashinfo *hinfo; 130 const struct tc_action_ops *ops; 131 }; 132 133 static inline 134 int tc_action_net_init(struct tc_action_net *tn, 135 const struct tc_action_ops *ops, unsigned int mask) 136 { 137 int err = 0; 138 139 tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL); 140 if (!tn->hinfo) 141 return -ENOMEM; 142 tn->ops = ops; 143 err = tcf_hashinfo_init(tn->hinfo, mask); 144 if (err) 145 kfree(tn->hinfo); 146 return err; 147 } 148 149 void tcf_hashinfo_destroy(const struct tc_action_ops *ops, 150 struct tcf_hashinfo *hinfo); 151 152 static inline void tc_action_net_exit(struct tc_action_net *tn) 153 { 154 tcf_hashinfo_destroy(tn->ops, tn->hinfo); 155 kfree(tn->hinfo); 156 } 157 158 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 159 struct netlink_callback *cb, int type, 160 const struct tc_action_ops *ops); 161 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 162 u32 tcf_hash_new_index(struct tc_action_net *tn); 163 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a, 164 int bind); 165 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 166 struct tc_action **a, const struct tc_action_ops *ops, int bind, 167 bool cpustats); 168 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est); 169 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a); 170 171 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict); 172 173 static inline int tcf_hash_release(struct tc_action *a, bool bind) 174 { 175 return __tcf_hash_release(a, bind, false); 176 } 177 178 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 179 int tcf_unregister_action(struct tc_action_ops *a, 180 struct pernet_operations *ops); 181 int tcf_action_destroy(struct list_head *actions, int bind); 182 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 183 int nr_actions, struct tcf_result *res); 184 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 185 struct nlattr *est, char *name, int ovr, int bind, 186 struct list_head *actions); 187 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 188 struct nlattr *nla, struct nlattr *est, 189 char *name, int ovr, int bind); 190 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int); 191 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 192 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 193 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 194 195 #endif /* CONFIG_NET_CLS_ACT */ 196 197 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 198 u64 packets, u64 lastuse) 199 { 200 #ifdef CONFIG_NET_CLS_ACT 201 if (!a->ops->stats_update) 202 return; 203 204 a->ops->stats_update(a, bytes, packets, lastuse); 205 #endif 206 } 207 208 #endif 209