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