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 }; 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 int (*get_dev)(const struct tc_action *a, struct net *net, 124 struct net_device **mirred_dev); 125 }; 126 127 struct tc_action_net { 128 struct tcf_hashinfo *hinfo; 129 const struct tc_action_ops *ops; 130 }; 131 132 static inline 133 int tc_action_net_init(struct tc_action_net *tn, 134 const struct tc_action_ops *ops, unsigned int mask) 135 { 136 int err = 0; 137 138 tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL); 139 if (!tn->hinfo) 140 return -ENOMEM; 141 tn->ops = ops; 142 err = tcf_hashinfo_init(tn->hinfo, mask); 143 if (err) 144 kfree(tn->hinfo); 145 return err; 146 } 147 148 void tcf_hashinfo_destroy(const struct tc_action_ops *ops, 149 struct tcf_hashinfo *hinfo); 150 151 static inline void tc_action_net_exit(struct tc_action_net *tn) 152 { 153 tcf_hashinfo_destroy(tn->ops, tn->hinfo); 154 kfree(tn->hinfo); 155 } 156 157 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 158 struct netlink_callback *cb, int type, 159 const struct tc_action_ops *ops); 160 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 161 u32 tcf_hash_new_index(struct tc_action_net *tn); 162 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a, 163 int bind); 164 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 165 struct tc_action **a, const struct tc_action_ops *ops, int bind, 166 bool cpustats); 167 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est); 168 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a); 169 170 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict); 171 172 static inline int tcf_hash_release(struct tc_action *a, bool bind) 173 { 174 return __tcf_hash_release(a, bind, false); 175 } 176 177 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 178 int tcf_unregister_action(struct tc_action_ops *a, 179 struct pernet_operations *ops); 180 int tcf_action_destroy(struct list_head *actions, int bind); 181 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 182 int nr_actions, struct tcf_result *res); 183 int tcf_action_init(struct net *net, struct nlattr *nla, 184 struct nlattr *est, char *n, int ovr, 185 int bind, struct list_head *); 186 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, 187 struct nlattr *est, char *n, int ovr, 188 int bind); 189 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int); 190 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 191 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 192 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 193 194 #endif /* CONFIG_NET_CLS_ACT */ 195 196 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 197 u64 packets, u64 lastuse) 198 { 199 #ifdef CONFIG_NET_CLS_ACT 200 if (!a->ops->stats_update) 201 return; 202 203 a->ops->stats_update(a, bytes, packets, lastuse); 204 #endif 205 } 206 207 #endif 208