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/flow_offload.h> 11 #include <net/sch_generic.h> 12 #include <net/pkt_sched.h> 13 #include <net/net_namespace.h> 14 #include <net/netns/generic.h> 15 16 struct tcf_idrinfo { 17 struct mutex lock; 18 struct idr action_idr; 19 struct net *net; 20 }; 21 22 struct tc_action_ops; 23 24 struct tc_action { 25 const struct tc_action_ops *ops; 26 __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ 27 struct tcf_idrinfo *idrinfo; 28 29 u32 tcfa_index; 30 refcount_t tcfa_refcnt; 31 atomic_t tcfa_bindcnt; 32 int tcfa_action; 33 struct tcf_t tcfa_tm; 34 struct gnet_stats_basic_sync tcfa_bstats; 35 struct gnet_stats_basic_sync tcfa_bstats_hw; 36 37 atomic_t tcfa_drops; 38 atomic_t tcfa_overlimits; 39 40 struct net_rate_estimator __rcu *tcfa_rate_est; 41 spinlock_t tcfa_lock; 42 struct gnet_stats_basic_sync __percpu *cpu_bstats; 43 struct gnet_stats_basic_sync __percpu *cpu_bstats_hw; 44 struct gnet_stats_queue __percpu *cpu_qstats; 45 struct tc_cookie __rcu *user_cookie; 46 struct tcf_chain __rcu *goto_chain; 47 u32 tcfa_flags; 48 struct rcu_head tcfa_rcu; 49 u8 hw_stats; 50 u8 used_hw_stats; 51 bool used_hw_stats_valid; 52 u32 in_hw_count; 53 }; 54 #define tcf_index common.tcfa_index 55 #define tcf_refcnt common.tcfa_refcnt 56 #define tcf_bindcnt common.tcfa_bindcnt 57 #define tcf_action common.tcfa_action 58 #define tcf_tm common.tcfa_tm 59 #define tcf_bstats common.tcfa_bstats 60 #define tcf_rate_est common.tcfa_rate_est 61 #define tcf_lock common.tcfa_lock 62 63 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \ 64 TCA_ACT_HW_STATS_DELAYED) 65 66 /* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */ 67 #define TCA_ACT_FLAGS_USER_BITS 16 68 #define TCA_ACT_FLAGS_USER_MASK 0xffff 69 #define TCA_ACT_FLAGS_POLICE (1U << TCA_ACT_FLAGS_USER_BITS) 70 #define TCA_ACT_FLAGS_BIND (1U << (TCA_ACT_FLAGS_USER_BITS + 1)) 71 #define TCA_ACT_FLAGS_REPLACE (1U << (TCA_ACT_FLAGS_USER_BITS + 2)) 72 #define TCA_ACT_FLAGS_NO_RTNL (1U << (TCA_ACT_FLAGS_USER_BITS + 3)) 73 #define TCA_ACT_FLAGS_AT_INGRESS (1U << (TCA_ACT_FLAGS_USER_BITS + 4)) 74 #define TCA_ACT_FLAGS_AT_INGRESS_OR_CLSACT (1U << (TCA_ACT_FLAGS_USER_BITS + 5)) 75 76 /* Update lastuse only if needed, to avoid dirtying a cache line. 77 * We use a temp variable to avoid fetching jiffies twice. 78 */ 79 static inline void tcf_lastuse_update(struct tcf_t *tm) 80 { 81 unsigned long now = jiffies; 82 83 if (READ_ONCE(tm->lastuse) != now) 84 WRITE_ONCE(tm->lastuse, now); 85 if (unlikely(!READ_ONCE(tm->firstuse))) 86 WRITE_ONCE(tm->firstuse, now); 87 } 88 89 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 90 { 91 unsigned long firstuse, now = jiffies; 92 93 dtm->install = jiffies_to_clock_t(now - READ_ONCE(stm->install)); 94 dtm->lastuse = jiffies_to_clock_t(now - READ_ONCE(stm->lastuse)); 95 96 firstuse = READ_ONCE(stm->firstuse); 97 dtm->firstuse = firstuse ? 98 jiffies_to_clock_t(now - firstuse) : 0; 99 100 dtm->expires = jiffies_to_clock_t(READ_ONCE(stm->expires)); 101 } 102 103 static inline enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats) 104 { 105 if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY)) 106 return FLOW_ACTION_HW_STATS_DONT_CARE; 107 else if (!hw_stats) 108 return FLOW_ACTION_HW_STATS_DISABLED; 109 110 return hw_stats; 111 } 112 113 typedef void (*tc_action_priv_destructor)(void *priv); 114 115 struct tc_action_ops { 116 struct list_head head; 117 char kind[IFNAMSIZ]; 118 enum tca_id id; /* identifier should match kind */ 119 unsigned int net_id; 120 size_t size; 121 struct module *owner; 122 int (*act)(struct sk_buff *, const struct tc_action *, 123 struct tcf_result *); /* called under RCU BH lock*/ 124 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 125 void (*cleanup)(struct tc_action *); 126 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 127 int (*init)(struct net *net, struct nlattr *nla, 128 struct nlattr *est, struct tc_action **act, 129 struct tcf_proto *tp, 130 u32 flags, struct netlink_ext_ack *extack); 131 int (*walk)(struct net *, struct sk_buff *, 132 struct netlink_callback *, int, 133 const struct tc_action_ops *, 134 struct netlink_ext_ack *); 135 void (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool); 136 size_t (*get_fill_size)(const struct tc_action *act); 137 struct net_device *(*get_dev)(const struct tc_action *a, 138 tc_action_priv_destructor *destructor); 139 struct psample_group * 140 (*get_psample_group)(const struct tc_action *a, 141 tc_action_priv_destructor *destructor); 142 int (*offload_act_setup)(struct tc_action *act, void *entry_data, 143 u32 *index_inc, bool bind, 144 struct netlink_ext_ack *extack); 145 }; 146 147 #ifdef CONFIG_NET_CLS_ACT 148 149 #define ACT_P_BOUND 0 150 #define ACT_P_CREATED 1 151 #define ACT_P_DELETED 1 152 153 struct tc_action_net { 154 struct tcf_idrinfo *idrinfo; 155 const struct tc_action_ops *ops; 156 }; 157 158 static inline 159 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 160 const struct tc_action_ops *ops) 161 { 162 int err = 0; 163 164 tn->idrinfo = kmalloc_obj(*tn->idrinfo); 165 if (!tn->idrinfo) 166 return -ENOMEM; 167 tn->ops = ops; 168 tn->idrinfo->net = net; 169 mutex_init(&tn->idrinfo->lock); 170 idr_init(&tn->idrinfo->action_idr); 171 return err; 172 } 173 174 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 175 struct tcf_idrinfo *idrinfo); 176 177 static inline void tc_action_net_exit(struct list_head *net_list, 178 unsigned int id) 179 { 180 struct net *net; 181 182 list_for_each_entry(net, net_list, exit_list) { 183 struct tc_action_net *tn = net_generic(net, id); 184 185 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 186 kfree(tn->idrinfo); 187 } 188 } 189 190 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 191 struct netlink_callback *cb, int type, 192 const struct tc_action_ops *ops, 193 struct netlink_ext_ack *extack); 194 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 195 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 196 struct tc_action **a, const struct tc_action_ops *ops, 197 int bind, bool cpustats, u32 flags); 198 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 199 struct nlattr *est, struct tc_action **a, 200 const struct tc_action_ops *ops, int bind, 201 u32 flags); 202 void tcf_idr_insert_many(struct tc_action *actions[], int init_res[]); 203 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 204 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 205 struct tc_action **a, int bind); 206 int tcf_idr_release(struct tc_action *a, bool bind); 207 208 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 209 int tcf_unregister_action(struct tc_action_ops *a, 210 struct pernet_operations *ops); 211 #define NET_ACT_ALIAS_PREFIX "net-act-" 212 #define MODULE_ALIAS_NET_ACT(kind) MODULE_ALIAS(NET_ACT_ALIAS_PREFIX kind) 213 int tcf_action_destroy(struct tc_action *actions[], int bind); 214 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 215 int nr_actions, struct tcf_result *res); 216 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 217 struct nlattr *est, 218 struct tc_action *actions[], int init_res[], size_t *attr_size, 219 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack); 220 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags, 221 struct netlink_ext_ack *extack); 222 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 223 struct nlattr *nla, struct nlattr *est, 224 struct tc_action_ops *a_o, int *init_res, 225 u32 flags, struct netlink_ext_ack *extack); 226 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 227 int ref, bool terse); 228 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 229 230 static inline void tcf_action_update_bstats(struct tc_action *a, 231 struct sk_buff *skb) 232 { 233 if (likely(a->cpu_bstats)) { 234 bstats_update(this_cpu_ptr(a->cpu_bstats), skb); 235 return; 236 } 237 spin_lock(&a->tcfa_lock); 238 bstats_update(&a->tcfa_bstats, skb); 239 spin_unlock(&a->tcfa_lock); 240 } 241 242 static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 243 { 244 if (likely(a->cpu_qstats)) { 245 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 246 return; 247 } 248 atomic_inc(&a->tcfa_drops); 249 } 250 251 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 252 { 253 if (likely(a->cpu_qstats)) { 254 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 255 return; 256 } 257 atomic_inc(&a->tcfa_overlimits); 258 } 259 260 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, 261 u64 drops, bool hw); 262 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 263 264 int tcf_action_update_hw_stats(struct tc_action *action); 265 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, 266 void *cb_priv, bool add); 267 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 268 struct tcf_chain **handle, 269 struct netlink_ext_ack *newchain); 270 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 271 struct tcf_chain *newchain); 272 273 #ifdef CONFIG_INET 274 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count); 275 #endif 276 277 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 278 279 #else /* !CONFIG_NET_CLS_ACT */ 280 281 static inline int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, 282 void *cb_priv, bool add) { 283 return 0; 284 } 285 286 #endif /* CONFIG_NET_CLS_ACT */ 287 288 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 289 u64 packets, u64 drops, 290 u64 lastuse, bool hw) 291 { 292 #ifdef CONFIG_NET_CLS_ACT 293 if (!a->ops->stats_update) 294 return; 295 296 a->ops->stats_update(a, bytes, packets, drops, lastuse, hw); 297 #endif 298 } 299 300 301 #endif 302