1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __NET_ACT_API_H 3 #define __NET_ACT_API_H 4 5 /* 6 * Public action API for classifiers/qdiscs 7 */ 8 9 #include <linux/refcount.h> 10 #include <net/sch_generic.h> 11 #include <net/pkt_sched.h> 12 #include <net/net_namespace.h> 13 #include <net/netns/generic.h> 14 15 struct tcf_idrinfo { 16 struct mutex lock; 17 struct idr action_idr; 18 struct net *net; 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 struct tcf_idrinfo *idrinfo; 27 28 u32 tcfa_index; 29 refcount_t tcfa_refcnt; 30 atomic_t tcfa_bindcnt; 31 int tcfa_action; 32 struct tcf_t tcfa_tm; 33 struct gnet_stats_basic_packed tcfa_bstats; 34 struct gnet_stats_basic_packed tcfa_bstats_hw; 35 struct gnet_stats_queue tcfa_qstats; 36 struct net_rate_estimator __rcu *tcfa_rate_est; 37 spinlock_t tcfa_lock; 38 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 39 struct gnet_stats_basic_cpu __percpu *cpu_bstats_hw; 40 struct gnet_stats_queue __percpu *cpu_qstats; 41 struct tc_cookie __rcu *act_cookie; 42 struct tcf_chain __rcu *goto_chain; 43 u32 tcfa_flags; 44 u8 hw_stats; 45 u8 used_hw_stats; 46 bool used_hw_stats_valid; 47 }; 48 #define tcf_index common.tcfa_index 49 #define tcf_refcnt common.tcfa_refcnt 50 #define tcf_bindcnt common.tcfa_bindcnt 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 58 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \ 59 TCA_ACT_HW_STATS_DELAYED) 60 61 /* Update lastuse only if needed, to avoid dirtying a cache line. 62 * We use a temp variable to avoid fetching jiffies twice. 63 */ 64 static inline void tcf_lastuse_update(struct tcf_t *tm) 65 { 66 unsigned long now = jiffies; 67 68 if (tm->lastuse != now) 69 tm->lastuse = now; 70 if (unlikely(!tm->firstuse)) 71 tm->firstuse = now; 72 } 73 74 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 75 { 76 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 77 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 78 dtm->firstuse = stm->firstuse ? 79 jiffies_to_clock_t(jiffies - stm->firstuse) : 0; 80 dtm->expires = jiffies_to_clock_t(stm->expires); 81 } 82 83 #ifdef CONFIG_NET_CLS_ACT 84 85 #define ACT_P_CREATED 1 86 #define ACT_P_DELETED 1 87 88 typedef void (*tc_action_priv_destructor)(void *priv); 89 90 struct tc_action_ops { 91 struct list_head head; 92 char kind[IFNAMSIZ]; 93 enum tca_id id; /* identifier should match kind */ 94 size_t size; 95 struct module *owner; 96 int (*act)(struct sk_buff *, const struct tc_action *, 97 struct tcf_result *); /* called under RCU BH lock*/ 98 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 99 void (*cleanup)(struct tc_action *); 100 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 101 int (*init)(struct net *net, struct nlattr *nla, 102 struct nlattr *est, struct tc_action **act, int ovr, 103 int bind, bool rtnl_held, struct tcf_proto *tp, 104 u32 flags, struct netlink_ext_ack *extack); 105 int (*walk)(struct net *, struct sk_buff *, 106 struct netlink_callback *, int, 107 const struct tc_action_ops *, 108 struct netlink_ext_ack *); 109 void (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool); 110 size_t (*get_fill_size)(const struct tc_action *act); 111 struct net_device *(*get_dev)(const struct tc_action *a, 112 tc_action_priv_destructor *destructor); 113 struct psample_group * 114 (*get_psample_group)(const struct tc_action *a, 115 tc_action_priv_destructor *destructor); 116 }; 117 118 struct tc_action_net { 119 struct tcf_idrinfo *idrinfo; 120 const struct tc_action_ops *ops; 121 }; 122 123 static inline 124 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 125 const struct tc_action_ops *ops) 126 { 127 int err = 0; 128 129 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 130 if (!tn->idrinfo) 131 return -ENOMEM; 132 tn->ops = ops; 133 tn->idrinfo->net = net; 134 mutex_init(&tn->idrinfo->lock); 135 idr_init(&tn->idrinfo->action_idr); 136 return err; 137 } 138 139 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 140 struct tcf_idrinfo *idrinfo); 141 142 static inline void tc_action_net_exit(struct list_head *net_list, 143 unsigned int id) 144 { 145 struct net *net; 146 147 rtnl_lock(); 148 list_for_each_entry(net, net_list, exit_list) { 149 struct tc_action_net *tn = net_generic(net, id); 150 151 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 152 kfree(tn->idrinfo); 153 } 154 rtnl_unlock(); 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 struct netlink_ext_ack *extack); 161 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 162 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 163 struct tc_action **a, const struct tc_action_ops *ops, 164 int bind, bool cpustats, u32 flags); 165 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 166 struct nlattr *est, struct tc_action **a, 167 const struct tc_action_ops *ops, int bind, 168 u32 flags); 169 void tcf_idr_insert_many(struct tc_action *actions[]); 170 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 171 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 172 struct tc_action **a, int bind); 173 int tcf_idr_release(struct tc_action *a, bool bind); 174 175 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 176 int tcf_unregister_action(struct tc_action_ops *a, 177 struct pernet_operations *ops); 178 int tcf_action_destroy(struct tc_action *actions[], int bind); 179 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 180 int nr_actions, struct tcf_result *res); 181 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 182 struct nlattr *est, char *name, int ovr, int bind, 183 struct tc_action *actions[], int init_res[], size_t *attr_size, 184 bool rtnl_held, struct netlink_ext_ack *extack); 185 struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla, 186 bool rtnl_held, 187 struct netlink_ext_ack *extack); 188 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 189 struct nlattr *nla, struct nlattr *est, 190 char *name, int ovr, int bind, 191 struct tc_action_ops *a_o, int *init_res, 192 bool rtnl_held, 193 struct netlink_ext_ack *extack); 194 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 195 int ref, bool terse); 196 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 197 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 198 199 static inline void tcf_action_update_bstats(struct tc_action *a, 200 struct sk_buff *skb) 201 { 202 if (likely(a->cpu_bstats)) { 203 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb); 204 return; 205 } 206 spin_lock(&a->tcfa_lock); 207 bstats_update(&a->tcfa_bstats, skb); 208 spin_unlock(&a->tcfa_lock); 209 } 210 211 static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 212 { 213 if (likely(a->cpu_qstats)) { 214 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 215 return; 216 } 217 spin_lock(&a->tcfa_lock); 218 qstats_drop_inc(&a->tcfa_qstats); 219 spin_unlock(&a->tcfa_lock); 220 } 221 222 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 223 { 224 if (likely(a->cpu_qstats)) { 225 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 226 return; 227 } 228 spin_lock(&a->tcfa_lock); 229 qstats_overlimit_inc(&a->tcfa_qstats); 230 spin_unlock(&a->tcfa_lock); 231 } 232 233 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, 234 u64 drops, bool hw); 235 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 236 237 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 238 struct tcf_chain **handle, 239 struct netlink_ext_ack *newchain); 240 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 241 struct tcf_chain *newchain); 242 243 #ifdef CONFIG_INET 244 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count); 245 #endif 246 247 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 248 #endif /* CONFIG_NET_CLS_ACT */ 249 250 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 251 u64 packets, u64 drops, 252 u64 lastuse, bool hw) 253 { 254 #ifdef CONFIG_NET_CLS_ACT 255 if (!a->ops->stats_update) 256 return; 257 258 a->ops->stats_update(a, bytes, packets, drops, lastuse, hw); 259 #endif 260 } 261 262 263 #endif 264