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