| 1 | #ifndef __NET_ACT_API_H |
| 2 | #define __NET_ACT_API_H |
| 3 | |
| 4 | /* |
| 5 | * Public police 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 | } |
| 80 | |
| 81 | struct tc_action { |
| 82 | void *priv; |
| 83 | const struct tc_action_ops *ops; |
| 84 | __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ |
| 85 | __u32 order; |
| 86 | struct list_head list; |
| 87 | struct tcf_hashinfo *hinfo; |
| 88 | }; |
| 89 | |
| 90 | #ifdef CONFIG_NET_CLS_ACT |
| 91 | |
| 92 | #define ACT_P_CREATED 1 |
| 93 | #define ACT_P_DELETED 1 |
| 94 | |
| 95 | struct tc_action_ops { |
| 96 | struct list_head head; |
| 97 | char kind[IFNAMSIZ]; |
| 98 | __u32 type; /* TBD to match kind */ |
| 99 | struct module *owner; |
| 100 | int (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *); |
| 101 | int (*dump)(struct sk_buff *, struct tc_action *, int, int); |
| 102 | void (*cleanup)(struct tc_action *, int bind); |
| 103 | int (*lookup)(struct net *, struct tc_action *, u32); |
| 104 | int (*init)(struct net *net, struct nlattr *nla, |
| 105 | struct nlattr *est, struct tc_action *act, int ovr, |
| 106 | int bind); |
| 107 | int (*walk)(struct net *, struct sk_buff *, |
| 108 | struct netlink_callback *, int, struct tc_action *); |
| 109 | }; |
| 110 | |
| 111 | struct tc_action_net { |
| 112 | struct tcf_hashinfo *hinfo; |
| 113 | const struct tc_action_ops *ops; |
| 114 | }; |
| 115 | |
| 116 | static inline |
| 117 | int tc_action_net_init(struct tc_action_net *tn, const struct tc_action_ops *ops, |
| 118 | unsigned int mask) |
| 119 | { |
| 120 | int err = 0; |
| 121 | |
| 122 | tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL); |
| 123 | if (!tn->hinfo) |
| 124 | return -ENOMEM; |
| 125 | tn->ops = ops; |
| 126 | err = tcf_hashinfo_init(tn->hinfo, mask); |
| 127 | if (err) |
| 128 | kfree(tn->hinfo); |
| 129 | return err; |
| 130 | } |
| 131 | |
| 132 | void tcf_hashinfo_destroy(const struct tc_action_ops *ops, |
| 133 | struct tcf_hashinfo *hinfo); |
| 134 | |
| 135 | static inline void tc_action_net_exit(struct tc_action_net *tn) |
| 136 | { |
| 137 | tcf_hashinfo_destroy(tn->ops, tn->hinfo); |
| 138 | } |
| 139 | |
| 140 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
| 141 | struct netlink_callback *cb, int type, |
| 142 | struct tc_action *a); |
| 143 | int tcf_hash_search(struct tc_action_net *tn, struct tc_action *a, u32 index); |
| 144 | u32 tcf_hash_new_index(struct tc_action_net *tn); |
| 145 | int tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action *a, |
| 146 | int bind); |
| 147 | int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
| 148 | struct tc_action *a, int size, int bind, bool cpustats); |
| 149 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est); |
| 150 | void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a); |
| 151 | |
| 152 | int __tcf_hash_release(struct tc_action *a, bool bind, bool strict); |
| 153 | |
| 154 | static inline int tcf_hash_release(struct tc_action *a, bool bind) |
| 155 | { |
| 156 | return __tcf_hash_release(a, bind, false); |
| 157 | } |
| 158 | |
| 159 | int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); |
| 160 | int tcf_unregister_action(struct tc_action_ops *a, struct pernet_operations *ops); |
| 161 | int tcf_action_destroy(struct list_head *actions, int bind); |
| 162 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
| 163 | struct tcf_result *res); |
| 164 | int tcf_action_init(struct net *net, struct nlattr *nla, |
| 165 | struct nlattr *est, char *n, int ovr, |
| 166 | int bind, struct list_head *); |
| 167 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
| 168 | struct nlattr *est, char *n, int ovr, |
| 169 | int bind); |
| 170 | int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int); |
| 171 | int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); |
| 172 | int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); |
| 173 | int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); |
| 174 | |
| 175 | #define tc_no_actions(_exts) \ |
| 176 | (list_empty(&(_exts)->actions)) |
| 177 | |
| 178 | #define tc_for_each_action(_a, _exts) \ |
| 179 | list_for_each_entry(a, &(_exts)->actions, list) |
| 180 | #else /* CONFIG_NET_CLS_ACT */ |
| 181 | |
| 182 | #define tc_no_actions(_exts) true |
| 183 | #define tc_for_each_action(_a, _exts) while (0) |
| 184 | |
| 185 | #endif /* CONFIG_NET_CLS_ACT */ |
| 186 | #endif |