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