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 __u32 order; 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_packed tcfa_bstats; 35 struct gnet_stats_basic_packed 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_cpu __percpu *cpu_bstats; 40 struct gnet_stats_basic_cpu __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 }; 46 #define tcf_index common.tcfa_index 47 #define tcf_refcnt common.tcfa_refcnt 48 #define tcf_bindcnt common.tcfa_bindcnt 49 #define tcf_action common.tcfa_action 50 #define tcf_tm common.tcfa_tm 51 #define tcf_bstats common.tcfa_bstats 52 #define tcf_qstats common.tcfa_qstats 53 #define tcf_rate_est common.tcfa_rate_est 54 #define tcf_lock common.tcfa_lock 55 56 /* Update lastuse only if needed, to avoid dirtying a cache line. 57 * We use a temp variable to avoid fetching jiffies twice. 58 */ 59 static inline void tcf_lastuse_update(struct tcf_t *tm) 60 { 61 unsigned long now = jiffies; 62 63 if (tm->lastuse != now) 64 tm->lastuse = now; 65 if (unlikely(!tm->firstuse)) 66 tm->firstuse = now; 67 } 68 69 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 70 { 71 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 72 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 73 dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); 74 dtm->expires = jiffies_to_clock_t(stm->expires); 75 } 76 77 #ifdef CONFIG_NET_CLS_ACT 78 79 #define ACT_P_CREATED 1 80 #define ACT_P_DELETED 1 81 82 typedef void (*tc_action_priv_destructor)(void *priv); 83 84 struct tc_action_ops { 85 struct list_head head; 86 char kind[IFNAMSIZ]; 87 enum tca_id id; /* identifier should match kind */ 88 size_t size; 89 struct module *owner; 90 int (*act)(struct sk_buff *, const struct tc_action *, 91 struct tcf_result *); /* called under RCU BH lock*/ 92 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 93 void (*cleanup)(struct tc_action *); 94 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 95 int (*init)(struct net *net, struct nlattr *nla, 96 struct nlattr *est, struct tc_action **act, int ovr, 97 int bind, bool rtnl_held, struct tcf_proto *tp, 98 u32 flags, struct netlink_ext_ack *extack); 99 int (*walk)(struct net *, struct sk_buff *, 100 struct netlink_callback *, int, 101 const struct tc_action_ops *, 102 struct netlink_ext_ack *); 103 void (*stats_update)(struct tc_action *, u64, u32, u64, bool); 104 size_t (*get_fill_size)(const struct tc_action *act); 105 struct net_device *(*get_dev)(const struct tc_action *a, 106 tc_action_priv_destructor *destructor); 107 struct psample_group * 108 (*get_psample_group)(const struct tc_action *a, 109 tc_action_priv_destructor *destructor); 110 }; 111 112 struct tc_action_net { 113 struct tcf_idrinfo *idrinfo; 114 const struct tc_action_ops *ops; 115 }; 116 117 static inline 118 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 119 const struct tc_action_ops *ops) 120 { 121 int err = 0; 122 123 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 124 if (!tn->idrinfo) 125 return -ENOMEM; 126 tn->ops = ops; 127 tn->idrinfo->net = net; 128 mutex_init(&tn->idrinfo->lock); 129 idr_init(&tn->idrinfo->action_idr); 130 return err; 131 } 132 133 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 134 struct tcf_idrinfo *idrinfo); 135 136 static inline void tc_action_net_exit(struct list_head *net_list, 137 unsigned int id) 138 { 139 struct net *net; 140 141 rtnl_lock(); 142 list_for_each_entry(net, net_list, exit_list) { 143 struct tc_action_net *tn = net_generic(net, id); 144 145 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 146 kfree(tn->idrinfo); 147 } 148 rtnl_unlock(); 149 } 150 151 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 152 struct netlink_callback *cb, int type, 153 const struct tc_action_ops *ops, 154 struct netlink_ext_ack *extack); 155 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 156 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 157 struct tc_action **a, const struct tc_action_ops *ops, 158 int bind, bool cpustats, u32 flags); 159 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 160 struct nlattr *est, struct tc_action **a, 161 const struct tc_action_ops *ops, int bind, 162 u32 flags); 163 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a); 164 165 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 166 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 167 struct tc_action **a, int bind); 168 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict); 169 170 static inline int tcf_idr_release(struct tc_action *a, bool bind) 171 { 172 return __tcf_idr_release(a, bind, false); 173 } 174 175 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 176 int tcf_unregister_action(struct tc_action_ops *a, 177 struct pernet_operations *ops); 178 int tcf_action_destroy(struct tc_action *actions[], int bind); 179 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 180 int nr_actions, struct tcf_result *res); 181 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 182 struct nlattr *est, char *name, int ovr, int bind, 183 struct tc_action *actions[], size_t *attr_size, 184 bool rtnl_held, struct netlink_ext_ack *extack); 185 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 186 struct nlattr *nla, struct nlattr *est, 187 char *name, int ovr, int bind, 188 bool rtnl_held, 189 struct netlink_ext_ack *extack); 190 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 191 int ref); 192 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 193 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 194 195 static inline void tcf_action_update_bstats(struct tc_action *a, 196 struct sk_buff *skb) 197 { 198 if (likely(a->cpu_bstats)) { 199 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb); 200 return; 201 } 202 spin_lock(&a->tcfa_lock); 203 bstats_update(&a->tcfa_bstats, skb); 204 spin_unlock(&a->tcfa_lock); 205 } 206 207 static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 208 { 209 if (likely(a->cpu_qstats)) { 210 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 211 return; 212 } 213 spin_lock(&a->tcfa_lock); 214 qstats_drop_inc(&a->tcfa_qstats); 215 spin_unlock(&a->tcfa_lock); 216 } 217 218 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 219 { 220 if (likely(a->cpu_qstats)) { 221 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 222 return; 223 } 224 spin_lock(&a->tcfa_lock); 225 qstats_overlimit_inc(&a->tcfa_qstats); 226 spin_unlock(&a->tcfa_lock); 227 } 228 229 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u32 packets, 230 bool drop, bool hw); 231 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 232 233 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 234 struct tcf_chain **handle, 235 struct netlink_ext_ack *newchain); 236 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 237 struct tcf_chain *newchain); 238 #endif /* CONFIG_NET_CLS_ACT */ 239 240 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 241 u64 packets, u64 lastuse, bool hw) 242 { 243 #ifdef CONFIG_NET_CLS_ACT 244 if (!a->ops->stats_update) 245 return; 246 247 a->ops->stats_update(a, bytes, packets, lastuse, hw); 248 #endif 249 } 250 251 252 #endif 253