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 struct gnet_stats_queue tcfa_qstats; 37 struct net_rate_estimator __rcu *tcfa_rate_est; 38 spinlock_t tcfa_lock; 39 struct gnet_stats_basic_sync __percpu *cpu_bstats; 40 struct gnet_stats_basic_sync __percpu *cpu_bstats_hw; 41 struct gnet_stats_queue __percpu *cpu_qstats; 42 struct tc_cookie __rcu *act_cookie; 43 struct tcf_chain __rcu *goto_chain; 44 u32 tcfa_flags; 45 u8 hw_stats; 46 u8 used_hw_stats; 47 bool used_hw_stats_valid; 48 u32 in_hw_count; 49 }; 50 #define tcf_index common.tcfa_index 51 #define tcf_refcnt common.tcfa_refcnt 52 #define tcf_bindcnt common.tcfa_bindcnt 53 #define tcf_action common.tcfa_action 54 #define tcf_tm common.tcfa_tm 55 #define tcf_bstats common.tcfa_bstats 56 #define tcf_qstats common.tcfa_qstats 57 #define tcf_rate_est common.tcfa_rate_est 58 #define tcf_lock common.tcfa_lock 59 60 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \ 61 TCA_ACT_HW_STATS_DELAYED) 62 63 /* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */ 64 #define TCA_ACT_FLAGS_USER_BITS 16 65 #define TCA_ACT_FLAGS_USER_MASK 0xffff 66 #define TCA_ACT_FLAGS_POLICE (1U << TCA_ACT_FLAGS_USER_BITS) 67 #define TCA_ACT_FLAGS_BIND (1U << (TCA_ACT_FLAGS_USER_BITS + 1)) 68 #define TCA_ACT_FLAGS_REPLACE (1U << (TCA_ACT_FLAGS_USER_BITS + 2)) 69 #define TCA_ACT_FLAGS_NO_RTNL (1U << (TCA_ACT_FLAGS_USER_BITS + 3)) 70 71 /* Update lastuse only if needed, to avoid dirtying a cache line. 72 * We use a temp variable to avoid fetching jiffies twice. 73 */ 74 static inline void tcf_lastuse_update(struct tcf_t *tm) 75 { 76 unsigned long now = jiffies; 77 78 if (tm->lastuse != now) 79 tm->lastuse = now; 80 if (unlikely(!tm->firstuse)) 81 tm->firstuse = now; 82 } 83 84 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 85 { 86 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 87 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 88 dtm->firstuse = stm->firstuse ? 89 jiffies_to_clock_t(jiffies - stm->firstuse) : 0; 90 dtm->expires = jiffies_to_clock_t(stm->expires); 91 } 92 93 static inline enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats) 94 { 95 if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY)) 96 return FLOW_ACTION_HW_STATS_DONT_CARE; 97 else if (!hw_stats) 98 return FLOW_ACTION_HW_STATS_DISABLED; 99 100 return hw_stats; 101 } 102 103 #ifdef CONFIG_NET_CLS_ACT 104 105 #define ACT_P_CREATED 1 106 #define ACT_P_DELETED 1 107 108 typedef void (*tc_action_priv_destructor)(void *priv); 109 110 struct tc_action_ops { 111 struct list_head head; 112 char kind[IFNAMSIZ]; 113 enum tca_id id; /* identifier should match kind */ 114 unsigned int net_id; 115 size_t size; 116 struct module *owner; 117 int (*act)(struct sk_buff *, const struct tc_action *, 118 struct tcf_result *); /* called under RCU BH lock*/ 119 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 120 void (*cleanup)(struct tc_action *); 121 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 122 int (*init)(struct net *net, struct nlattr *nla, 123 struct nlattr *est, struct tc_action **act, 124 struct tcf_proto *tp, 125 u32 flags, struct netlink_ext_ack *extack); 126 int (*walk)(struct net *, struct sk_buff *, 127 struct netlink_callback *, int, 128 const struct tc_action_ops *, 129 struct netlink_ext_ack *); 130 void (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool); 131 size_t (*get_fill_size)(const struct tc_action *act); 132 struct net_device *(*get_dev)(const struct tc_action *a, 133 tc_action_priv_destructor *destructor); 134 struct psample_group * 135 (*get_psample_group)(const struct tc_action *a, 136 tc_action_priv_destructor *destructor); 137 int (*offload_act_setup)(struct tc_action *act, void *entry_data, 138 u32 *index_inc, bool bind, 139 struct netlink_ext_ack *extack); 140 }; 141 142 struct tc_action_net { 143 struct tcf_idrinfo *idrinfo; 144 const struct tc_action_ops *ops; 145 }; 146 147 static inline 148 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 149 const struct tc_action_ops *ops) 150 { 151 int err = 0; 152 153 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 154 if (!tn->idrinfo) 155 return -ENOMEM; 156 tn->ops = ops; 157 tn->idrinfo->net = net; 158 mutex_init(&tn->idrinfo->lock); 159 idr_init(&tn->idrinfo->action_idr); 160 return err; 161 } 162 163 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 164 struct tcf_idrinfo *idrinfo); 165 166 static inline void tc_action_net_exit(struct list_head *net_list, 167 unsigned int id) 168 { 169 struct net *net; 170 171 rtnl_lock(); 172 list_for_each_entry(net, net_list, exit_list) { 173 struct tc_action_net *tn = net_generic(net, id); 174 175 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 176 kfree(tn->idrinfo); 177 } 178 rtnl_unlock(); 179 } 180 181 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 182 struct netlink_callback *cb, int type, 183 const struct tc_action_ops *ops, 184 struct netlink_ext_ack *extack); 185 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 186 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 187 struct tc_action **a, const struct tc_action_ops *ops, 188 int bind, bool cpustats, u32 flags); 189 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 190 struct nlattr *est, struct tc_action **a, 191 const struct tc_action_ops *ops, int bind, 192 u32 flags); 193 void tcf_idr_insert_many(struct tc_action *actions[]); 194 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 195 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 196 struct tc_action **a, int bind); 197 int tcf_idr_release(struct tc_action *a, bool bind); 198 199 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 200 int tcf_unregister_action(struct tc_action_ops *a, 201 struct pernet_operations *ops); 202 int tcf_action_destroy(struct tc_action *actions[], int bind); 203 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 204 int nr_actions, struct tcf_result *res); 205 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 206 struct nlattr *est, 207 struct tc_action *actions[], int init_res[], size_t *attr_size, 208 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack); 209 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, 210 bool rtnl_held, 211 struct netlink_ext_ack *extack); 212 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 213 struct nlattr *nla, struct nlattr *est, 214 struct tc_action_ops *a_o, int *init_res, 215 u32 flags, struct netlink_ext_ack *extack); 216 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 217 int ref, bool terse); 218 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 219 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 220 221 static inline void tcf_action_update_bstats(struct tc_action *a, 222 struct sk_buff *skb) 223 { 224 if (likely(a->cpu_bstats)) { 225 bstats_update(this_cpu_ptr(a->cpu_bstats), skb); 226 return; 227 } 228 spin_lock(&a->tcfa_lock); 229 bstats_update(&a->tcfa_bstats, skb); 230 spin_unlock(&a->tcfa_lock); 231 } 232 233 static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 234 { 235 if (likely(a->cpu_qstats)) { 236 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 237 return; 238 } 239 spin_lock(&a->tcfa_lock); 240 qstats_drop_inc(&a->tcfa_qstats); 241 spin_unlock(&a->tcfa_lock); 242 } 243 244 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 245 { 246 if (likely(a->cpu_qstats)) { 247 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 248 return; 249 } 250 spin_lock(&a->tcfa_lock); 251 qstats_overlimit_inc(&a->tcfa_qstats); 252 spin_unlock(&a->tcfa_lock); 253 } 254 255 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, 256 u64 drops, bool hw); 257 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 258 259 int tcf_action_update_hw_stats(struct tc_action *action); 260 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, 261 void *cb_priv, bool add); 262 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 263 struct tcf_chain **handle, 264 struct netlink_ext_ack *newchain); 265 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 266 struct tcf_chain *newchain); 267 268 #ifdef CONFIG_INET 269 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count); 270 #endif 271 272 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 273 274 #else /* !CONFIG_NET_CLS_ACT */ 275 276 static inline int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, 277 void *cb_priv, bool add) { 278 return 0; 279 } 280 281 #endif /* CONFIG_NET_CLS_ACT */ 282 283 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 284 u64 packets, u64 drops, 285 u64 lastuse, bool hw) 286 { 287 #ifdef CONFIG_NET_CLS_ACT 288 if (!a->ops->stats_update) 289 return; 290 291 a->ops->stats_update(a, bytes, packets, drops, lastuse, hw); 292 #endif 293 } 294 295 296 #endif 297