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 struct tcf_common { 14 struct hlist_node tcfc_head; 15 u32 tcfc_index; 16 int tcfc_refcnt; 17 int tcfc_bindcnt; 18 u32 tcfc_capab; 19 int tcfc_action; 20 struct tcf_t tcfc_tm; 21 struct gnet_stats_basic_packed tcfc_bstats; 22 struct gnet_stats_queue tcfc_qstats; 23 struct gnet_stats_rate_est64 tcfc_rate_est; 24 spinlock_t tcfc_lock; 25 struct rcu_head tcfc_rcu; 26 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 27 struct gnet_stats_queue __percpu *cpu_qstats; 28 }; 29 #define tcf_head common.tcfc_head 30 #define tcf_index common.tcfc_index 31 #define tcf_refcnt common.tcfc_refcnt 32 #define tcf_bindcnt common.tcfc_bindcnt 33 #define tcf_capab common.tcfc_capab 34 #define tcf_action common.tcfc_action 35 #define tcf_tm common.tcfc_tm 36 #define tcf_bstats common.tcfc_bstats 37 #define tcf_qstats common.tcfc_qstats 38 #define tcf_rate_est common.tcfc_rate_est 39 #define tcf_lock common.tcfc_lock 40 #define tcf_rcu common.tcfc_rcu 41 42 struct tcf_hashinfo { 43 struct hlist_head *htab; 44 unsigned int hmask; 45 spinlock_t lock; 46 u32 index; 47 }; 48 49 static inline unsigned int tcf_hash(u32 index, unsigned int hmask) 50 { 51 return index & hmask; 52 } 53 54 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask) 55 { 56 int i; 57 58 spin_lock_init(&hf->lock); 59 hf->index = 0; 60 hf->hmask = mask; 61 hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head), 62 GFP_KERNEL); 63 if (!hf->htab) 64 return -ENOMEM; 65 for (i = 0; i < mask + 1; i++) 66 INIT_HLIST_HEAD(&hf->htab[i]); 67 return 0; 68 } 69 70 /* Update lastuse only if needed, to avoid dirtying a cache line. 71 * We use a temp variable to avoid fetching jiffies twice. 72 */ 73 static inline void tcf_lastuse_update(struct tcf_t *tm) 74 { 75 unsigned long now = jiffies; 76 77 if (tm->lastuse != now) 78 tm->lastuse = now; 79 if (unlikely(!tm->firstuse)) 80 tm->firstuse = now; 81 } 82 83 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 84 { 85 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 86 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 87 dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); 88 dtm->expires = jiffies_to_clock_t(stm->expires); 89 } 90 91 struct tc_action { 92 void *priv; 93 const struct tc_action_ops *ops; 94 __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ 95 __u32 order; 96 struct list_head list; 97 struct tcf_hashinfo *hinfo; 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 struct module *owner; 110 int (*act)(struct sk_buff *, const struct tc_action *, 111 struct tcf_result *); 112 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 113 void (*cleanup)(struct tc_action *, int bind); 114 int (*lookup)(struct net *, struct tc_action *, u32); 115 int (*init)(struct net *net, struct nlattr *nla, 116 struct nlattr *est, struct tc_action *act, int ovr, 117 int bind); 118 int (*walk)(struct net *, struct sk_buff *, 119 struct netlink_callback *, int, struct tc_action *); 120 void (*stats_update)(struct tc_action *, u64, u32, u64); 121 }; 122 123 struct tc_action_net { 124 struct tcf_hashinfo *hinfo; 125 const struct tc_action_ops *ops; 126 }; 127 128 static inline 129 int tc_action_net_init(struct tc_action_net *tn, 130 const struct tc_action_ops *ops, unsigned int mask) 131 { 132 int err = 0; 133 134 tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL); 135 if (!tn->hinfo) 136 return -ENOMEM; 137 tn->ops = ops; 138 err = tcf_hashinfo_init(tn->hinfo, mask); 139 if (err) 140 kfree(tn->hinfo); 141 return err; 142 } 143 144 void tcf_hashinfo_destroy(const struct tc_action_ops *ops, 145 struct tcf_hashinfo *hinfo); 146 147 static inline void tc_action_net_exit(struct tc_action_net *tn) 148 { 149 tcf_hashinfo_destroy(tn->ops, tn->hinfo); 150 kfree(tn->hinfo); 151 } 152 153 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 154 struct netlink_callback *cb, int type, 155 struct tc_action *a); 156 int tcf_hash_search(struct tc_action_net *tn, struct tc_action *a, u32 index); 157 u32 tcf_hash_new_index(struct tc_action_net *tn); 158 int tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action *a, 159 int bind); 160 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 161 struct tc_action *a, int size, int bind, bool cpustats); 162 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est); 163 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a); 164 165 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict); 166 167 static inline int tcf_hash_release(struct tc_action *a, bool bind) 168 { 169 return __tcf_hash_release(a, bind, false); 170 } 171 172 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 173 int tcf_unregister_action(struct tc_action_ops *a, 174 struct pernet_operations *ops); 175 int tcf_action_destroy(struct list_head *actions, int bind); 176 int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, 177 struct tcf_result *res); 178 int tcf_action_init(struct net *net, struct nlattr *nla, 179 struct nlattr *est, char *n, int ovr, 180 int bind, struct list_head *); 181 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, 182 struct nlattr *est, char *n, int ovr, 183 int bind); 184 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int); 185 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 186 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 187 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 188 189 #define tc_no_actions(_exts) \ 190 (list_empty(&(_exts)->actions)) 191 192 #define tc_for_each_action(_a, _exts) \ 193 list_for_each_entry(a, &(_exts)->actions, list) 194 195 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 196 u64 packets, u64 lastuse) 197 { 198 if (!a->ops->stats_update) 199 return; 200 201 a->ops->stats_update(a, bytes, packets, lastuse); 202 } 203 204 #else /* CONFIG_NET_CLS_ACT */ 205 206 #define tc_no_actions(_exts) true 207 #define tc_for_each_action(_a, _exts) while ((void)(_a), 0) 208 #define tcf_action_stats_update(a, bytes, packets, lastuse) 209 210 #endif /* CONFIG_NET_CLS_ACT */ 211 #endif 212