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_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 }; 123 124 struct tc_action_net { 125 struct tcf_hashinfo *hinfo; 126 const struct tc_action_ops *ops; 127 }; 128 129 static inline 130 int tc_action_net_init(struct tc_action_net *tn, 131 const struct tc_action_ops *ops, unsigned int mask) 132 { 133 int err = 0; 134 135 tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL); 136 if (!tn->hinfo) 137 return -ENOMEM; 138 tn->ops = ops; 139 err = tcf_hashinfo_init(tn->hinfo, mask); 140 if (err) 141 kfree(tn->hinfo); 142 return err; 143 } 144 145 void tcf_hashinfo_destroy(const struct tc_action_ops *ops, 146 struct tcf_hashinfo *hinfo); 147 148 static inline void tc_action_net_exit(struct tc_action_net *tn) 149 { 150 tcf_hashinfo_destroy(tn->ops, tn->hinfo); 151 kfree(tn->hinfo); 152 } 153 154 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 155 struct netlink_callback *cb, int type, 156 const struct tc_action_ops *ops); 157 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 158 u32 tcf_hash_new_index(struct tc_action_net *tn); 159 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a, 160 int bind); 161 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 162 struct tc_action **a, const struct tc_action_ops *ops, int bind, 163 bool cpustats); 164 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est); 165 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a); 166 167 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict); 168 169 static inline int tcf_hash_release(struct tc_action *a, bool bind) 170 { 171 return __tcf_hash_release(a, bind, false); 172 } 173 174 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 175 int tcf_unregister_action(struct tc_action_ops *a, 176 struct pernet_operations *ops); 177 int tcf_action_destroy(struct list_head *actions, int bind); 178 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 179 int nr_actions, struct tcf_result *res); 180 int tcf_action_init(struct net *net, struct nlattr *nla, 181 struct nlattr *est, char *n, int ovr, 182 int bind, struct list_head *); 183 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, 184 struct nlattr *est, char *n, int ovr, 185 int bind); 186 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int); 187 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 188 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 189 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 190 191 #endif /* CONFIG_NET_CLS_ACT */ 192 193 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 194 u64 packets, u64 lastuse) 195 { 196 #ifdef CONFIG_NET_CLS_ACT 197 if (!a->ops->stats_update) 198 return; 199 200 a->ops->stats_update(a, bytes, packets, lastuse); 201 #endif 202 } 203 204 #endif 205