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 *user_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 #define TCA_ACT_FLAGS_AT_INGRESS (1U << (TCA_ACT_FLAGS_USER_BITS + 4)) 71 72 /* Update lastuse only if needed, to avoid dirtying a cache line. 73 * We use a temp variable to avoid fetching jiffies twice. 74 */ tcf_lastuse_update(struct tcf_t * tm)75 static inline void tcf_lastuse_update(struct tcf_t *tm) 76 { 77 unsigned long now = jiffies; 78 79 if (tm->lastuse != now) 80 tm->lastuse = now; 81 if (unlikely(!tm->firstuse)) 82 tm->firstuse = now; 83 } 84 tcf_tm_dump(struct tcf_t * dtm,const struct tcf_t * stm)85 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 86 { 87 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 88 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 89 dtm->firstuse = stm->firstuse ? 90 jiffies_to_clock_t(jiffies - stm->firstuse) : 0; 91 dtm->expires = jiffies_to_clock_t(stm->expires); 92 } 93 tc_act_hw_stats(u8 hw_stats)94 static inline enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats) 95 { 96 if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY)) 97 return FLOW_ACTION_HW_STATS_DONT_CARE; 98 else if (!hw_stats) 99 return FLOW_ACTION_HW_STATS_DISABLED; 100 101 return hw_stats; 102 } 103 104 typedef void (*tc_action_priv_destructor)(void *priv); 105 106 struct tc_action_ops { 107 struct list_head head; 108 char kind[IFNAMSIZ]; 109 enum tca_id id; /* identifier should match kind */ 110 unsigned int net_id; 111 size_t size; 112 struct module *owner; 113 int (*act)(struct sk_buff *, const struct tc_action *, 114 struct tcf_result *); /* called under RCU BH lock*/ 115 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 116 void (*cleanup)(struct tc_action *); 117 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 118 int (*init)(struct net *net, struct nlattr *nla, 119 struct nlattr *est, struct tc_action **act, 120 struct tcf_proto *tp, 121 u32 flags, struct netlink_ext_ack *extack); 122 int (*walk)(struct net *, struct sk_buff *, 123 struct netlink_callback *, int, 124 const struct tc_action_ops *, 125 struct netlink_ext_ack *); 126 void (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool); 127 size_t (*get_fill_size)(const struct tc_action *act); 128 struct net_device *(*get_dev)(const struct tc_action *a, 129 tc_action_priv_destructor *destructor); 130 struct psample_group * 131 (*get_psample_group)(const struct tc_action *a, 132 tc_action_priv_destructor *destructor); 133 int (*offload_act_setup)(struct tc_action *act, void *entry_data, 134 u32 *index_inc, bool bind, 135 struct netlink_ext_ack *extack); 136 }; 137 138 #ifdef CONFIG_NET_CLS_ACT 139 140 #define ACT_P_BOUND 0 141 #define ACT_P_CREATED 1 142 #define ACT_P_DELETED 1 143 144 struct tc_action_net { 145 struct tcf_idrinfo *idrinfo; 146 const struct tc_action_ops *ops; 147 }; 148 149 static inline tc_action_net_init(struct net * net,struct tc_action_net * tn,const struct tc_action_ops * ops)150 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 151 const struct tc_action_ops *ops) 152 { 153 int err = 0; 154 155 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 156 if (!tn->idrinfo) 157 return -ENOMEM; 158 tn->ops = ops; 159 tn->idrinfo->net = net; 160 mutex_init(&tn->idrinfo->lock); 161 idr_init(&tn->idrinfo->action_idr); 162 return err; 163 } 164 165 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 166 struct tcf_idrinfo *idrinfo); 167 tc_action_net_exit(struct list_head * net_list,unsigned int id)168 static inline void tc_action_net_exit(struct list_head *net_list, 169 unsigned int id) 170 { 171 struct net *net; 172 173 rtnl_lock(); 174 list_for_each_entry(net, net_list, exit_list) { 175 struct tc_action_net *tn = net_generic(net, id); 176 177 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 178 kfree(tn->idrinfo); 179 } 180 rtnl_unlock(); 181 } 182 183 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 184 struct netlink_callback *cb, int type, 185 const struct tc_action_ops *ops, 186 struct netlink_ext_ack *extack); 187 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 188 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 189 struct tc_action **a, const struct tc_action_ops *ops, 190 int bind, bool cpustats, u32 flags); 191 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 192 struct nlattr *est, struct tc_action **a, 193 const struct tc_action_ops *ops, int bind, 194 u32 flags); 195 void tcf_idr_insert_many(struct tc_action *actions[], int init_res[]); 196 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 197 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 198 struct tc_action **a, int bind); 199 int tcf_idr_release(struct tc_action *a, bool bind); 200 201 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 202 int tcf_unregister_action(struct tc_action_ops *a, 203 struct pernet_operations *ops); 204 #define NET_ACT_ALIAS_PREFIX "net-act-" 205 #define MODULE_ALIAS_NET_ACT(kind) MODULE_ALIAS(NET_ACT_ALIAS_PREFIX kind) 206 int tcf_action_destroy(struct tc_action *actions[], int bind); 207 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 208 int nr_actions, struct tcf_result *res); 209 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 210 struct nlattr *est, 211 struct tc_action *actions[], int init_res[], size_t *attr_size, 212 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack); 213 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags, 214 struct netlink_ext_ack *extack); 215 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 216 struct nlattr *nla, struct nlattr *est, 217 struct tc_action_ops *a_o, int *init_res, 218 u32 flags, struct netlink_ext_ack *extack); 219 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 220 int ref, bool terse); 221 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 222 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 223 tcf_action_update_bstats(struct tc_action * a,struct sk_buff * skb)224 static inline void tcf_action_update_bstats(struct tc_action *a, 225 struct sk_buff *skb) 226 { 227 if (likely(a->cpu_bstats)) { 228 bstats_update(this_cpu_ptr(a->cpu_bstats), skb); 229 return; 230 } 231 spin_lock(&a->tcfa_lock); 232 bstats_update(&a->tcfa_bstats, skb); 233 spin_unlock(&a->tcfa_lock); 234 } 235 tcf_action_inc_drop_qstats(struct tc_action * a)236 static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 237 { 238 if (likely(a->cpu_qstats)) { 239 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 240 return; 241 } 242 spin_lock(&a->tcfa_lock); 243 qstats_drop_inc(&a->tcfa_qstats); 244 spin_unlock(&a->tcfa_lock); 245 } 246 tcf_action_inc_overlimit_qstats(struct tc_action * a)247 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 248 { 249 if (likely(a->cpu_qstats)) { 250 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 251 return; 252 } 253 spin_lock(&a->tcfa_lock); 254 qstats_overlimit_inc(&a->tcfa_qstats); 255 spin_unlock(&a->tcfa_lock); 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 tcf_action_reoffload_cb(flow_indr_block_bind_cb_t * cb,void * cb_priv,bool add)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 tcf_action_stats_update(struct tc_action * a,u64 bytes,u64 packets,u64 drops,u64 lastuse,bool hw)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