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/sch_generic.h> 11 #include <net/pkt_sched.h> 12 #include <net/net_namespace.h> 13 #include <net/netns/generic.h> 14 15 struct tcf_idrinfo { 16 struct mutex lock; 17 struct idr action_idr; 18 struct net *net; 19 }; 20 21 struct tc_action_ops; 22 23 struct tc_action { 24 const struct tc_action_ops *ops; 25 __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ 26 struct tcf_idrinfo *idrinfo; 27 28 u32 tcfa_index; 29 refcount_t tcfa_refcnt; 30 atomic_t tcfa_bindcnt; 31 int tcfa_action; 32 struct tcf_t tcfa_tm; 33 struct gnet_stats_basic_sync tcfa_bstats; 34 struct gnet_stats_basic_sync tcfa_bstats_hw; 35 struct gnet_stats_queue tcfa_qstats; 36 struct net_rate_estimator __rcu *tcfa_rate_est; 37 spinlock_t tcfa_lock; 38 struct gnet_stats_basic_sync __percpu *cpu_bstats; 39 struct gnet_stats_basic_sync __percpu *cpu_bstats_hw; 40 struct gnet_stats_queue __percpu *cpu_qstats; 41 struct tc_cookie __rcu *act_cookie; 42 struct tcf_chain __rcu *goto_chain; 43 u32 tcfa_flags; 44 u8 hw_stats; 45 u8 used_hw_stats; 46 bool used_hw_stats_valid; 47 }; 48 #define tcf_index common.tcfa_index 49 #define tcf_refcnt common.tcfa_refcnt 50 #define tcf_bindcnt common.tcfa_bindcnt 51 #define tcf_action common.tcfa_action 52 #define tcf_tm common.tcfa_tm 53 #define tcf_bstats common.tcfa_bstats 54 #define tcf_qstats common.tcfa_qstats 55 #define tcf_rate_est common.tcfa_rate_est 56 #define tcf_lock common.tcfa_lock 57 58 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \ 59 TCA_ACT_HW_STATS_DELAYED) 60 61 /* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */ 62 #define TCA_ACT_FLAGS_USER_BITS 16 63 #define TCA_ACT_FLAGS_USER_MASK 0xffff 64 #define TCA_ACT_FLAGS_POLICE (1U << TCA_ACT_FLAGS_USER_BITS) 65 #define TCA_ACT_FLAGS_BIND (1U << (TCA_ACT_FLAGS_USER_BITS + 1)) 66 #define TCA_ACT_FLAGS_REPLACE (1U << (TCA_ACT_FLAGS_USER_BITS + 2)) 67 #define TCA_ACT_FLAGS_NO_RTNL (1U << (TCA_ACT_FLAGS_USER_BITS + 3)) 68 69 /* Update lastuse only if needed, to avoid dirtying a cache line. 70 * We use a temp variable to avoid fetching jiffies twice. 71 */ 72 static inline void tcf_lastuse_update(struct tcf_t *tm) 73 { 74 unsigned long now = jiffies; 75 76 if (tm->lastuse != now) 77 tm->lastuse = now; 78 if (unlikely(!tm->firstuse)) 79 tm->firstuse = now; 80 } 81 82 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 83 { 84 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 85 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 86 dtm->firstuse = stm->firstuse ? 87 jiffies_to_clock_t(jiffies - stm->firstuse) : 0; 88 dtm->expires = jiffies_to_clock_t(stm->expires); 89 } 90 91 #ifdef CONFIG_NET_CLS_ACT 92 93 #define ACT_P_CREATED 1 94 #define ACT_P_DELETED 1 95 96 typedef void (*tc_action_priv_destructor)(void *priv); 97 98 struct tc_action_ops { 99 struct list_head head; 100 char kind[IFNAMSIZ]; 101 enum tca_id id; /* identifier should match kind */ 102 size_t size; 103 struct module *owner; 104 int (*act)(struct sk_buff *, const struct tc_action *, 105 struct tcf_result *); /* called under RCU BH lock*/ 106 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 107 void (*cleanup)(struct tc_action *); 108 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 109 int (*init)(struct net *net, struct nlattr *nla, 110 struct nlattr *est, struct tc_action **act, 111 struct tcf_proto *tp, 112 u32 flags, struct netlink_ext_ack *extack); 113 int (*walk)(struct net *, struct sk_buff *, 114 struct netlink_callback *, int, 115 const struct tc_action_ops *, 116 struct netlink_ext_ack *); 117 void (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool); 118 size_t (*get_fill_size)(const struct tc_action *act); 119 struct net_device *(*get_dev)(const struct tc_action *a, 120 tc_action_priv_destructor *destructor); 121 struct psample_group * 122 (*get_psample_group)(const struct tc_action *a, 123 tc_action_priv_destructor *destructor); 124 }; 125 126 struct tc_action_net { 127 struct tcf_idrinfo *idrinfo; 128 const struct tc_action_ops *ops; 129 }; 130 131 static inline 132 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 133 const struct tc_action_ops *ops) 134 { 135 int err = 0; 136 137 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 138 if (!tn->idrinfo) 139 return -ENOMEM; 140 tn->ops = ops; 141 tn->idrinfo->net = net; 142 mutex_init(&tn->idrinfo->lock); 143 idr_init(&tn->idrinfo->action_idr); 144 return err; 145 } 146 147 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 148 struct tcf_idrinfo *idrinfo); 149 150 static inline void tc_action_net_exit(struct list_head *net_list, 151 unsigned int id) 152 { 153 struct net *net; 154 155 rtnl_lock(); 156 list_for_each_entry(net, net_list, exit_list) { 157 struct tc_action_net *tn = net_generic(net, id); 158 159 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 160 kfree(tn->idrinfo); 161 } 162 rtnl_unlock(); 163 } 164 165 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 166 struct netlink_callback *cb, int type, 167 const struct tc_action_ops *ops, 168 struct netlink_ext_ack *extack); 169 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 170 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 171 struct tc_action **a, const struct tc_action_ops *ops, 172 int bind, bool cpustats, u32 flags); 173 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 174 struct nlattr *est, struct tc_action **a, 175 const struct tc_action_ops *ops, int bind, 176 u32 flags); 177 void tcf_idr_insert_many(struct tc_action *actions[]); 178 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 179 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 180 struct tc_action **a, int bind); 181 int tcf_idr_release(struct tc_action *a, bool bind); 182 183 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 184 int tcf_unregister_action(struct tc_action_ops *a, 185 struct pernet_operations *ops); 186 int tcf_action_destroy(struct tc_action *actions[], int bind); 187 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 188 int nr_actions, struct tcf_result *res); 189 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 190 struct nlattr *est, 191 struct tc_action *actions[], int init_res[], size_t *attr_size, 192 u32 flags, struct netlink_ext_ack *extack); 193 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, 194 bool rtnl_held, 195 struct netlink_ext_ack *extack); 196 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 197 struct nlattr *nla, struct nlattr *est, 198 struct tc_action_ops *a_o, int *init_res, 199 u32 flags, struct netlink_ext_ack *extack); 200 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 201 int ref, bool terse); 202 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 203 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 204 205 static inline void tcf_action_update_bstats(struct tc_action *a, 206 struct sk_buff *skb) 207 { 208 if (likely(a->cpu_bstats)) { 209 bstats_update(this_cpu_ptr(a->cpu_bstats), skb); 210 return; 211 } 212 spin_lock(&a->tcfa_lock); 213 bstats_update(&a->tcfa_bstats, skb); 214 spin_unlock(&a->tcfa_lock); 215 } 216 217 static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 218 { 219 if (likely(a->cpu_qstats)) { 220 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 221 return; 222 } 223 spin_lock(&a->tcfa_lock); 224 qstats_drop_inc(&a->tcfa_qstats); 225 spin_unlock(&a->tcfa_lock); 226 } 227 228 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 229 { 230 if (likely(a->cpu_qstats)) { 231 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 232 return; 233 } 234 spin_lock(&a->tcfa_lock); 235 qstats_overlimit_inc(&a->tcfa_qstats); 236 spin_unlock(&a->tcfa_lock); 237 } 238 239 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, 240 u64 drops, bool hw); 241 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 242 243 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 244 struct tcf_chain **handle, 245 struct netlink_ext_ack *newchain); 246 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 247 struct tcf_chain *newchain); 248 249 #ifdef CONFIG_INET 250 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count); 251 #endif 252 253 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 254 #endif /* CONFIG_NET_CLS_ACT */ 255 256 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 257 u64 packets, u64 drops, 258 u64 lastuse, bool hw) 259 { 260 #ifdef CONFIG_NET_CLS_ACT 261 if (!a->ops->stats_update) 262 return; 263 264 a->ops->stats_update(a, bytes, packets, drops, lastuse, hw); 265 #endif 266 } 267 268 269 #endif 270