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_packed tcfa_bstats; 34 struct gnet_stats_basic_packed 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_cpu __percpu *cpu_bstats; 39 struct gnet_stats_basic_cpu __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_type; 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 #define TCA_ACT_HW_STATS_TYPE_ANY (TCA_ACT_HW_STATS_TYPE_IMMEDIATE | \ 57 TCA_ACT_HW_STATS_TYPE_DELAYED) 58 59 /* Update lastuse only if needed, to avoid dirtying a cache line. 60 * We use a temp variable to avoid fetching jiffies twice. 61 */ 62 static inline void tcf_lastuse_update(struct tcf_t *tm) 63 { 64 unsigned long now = jiffies; 65 66 if (tm->lastuse != now) 67 tm->lastuse = now; 68 if (unlikely(!tm->firstuse)) 69 tm->firstuse = now; 70 } 71 72 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 73 { 74 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 75 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 76 dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); 77 dtm->expires = jiffies_to_clock_t(stm->expires); 78 } 79 80 #ifdef CONFIG_NET_CLS_ACT 81 82 #define ACT_P_CREATED 1 83 #define ACT_P_DELETED 1 84 85 typedef void (*tc_action_priv_destructor)(void *priv); 86 87 struct tc_action_ops { 88 struct list_head head; 89 char kind[IFNAMSIZ]; 90 enum tca_id id; /* identifier should match kind */ 91 size_t size; 92 struct module *owner; 93 int (*act)(struct sk_buff *, const struct tc_action *, 94 struct tcf_result *); /* called under RCU BH lock*/ 95 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 96 void (*cleanup)(struct tc_action *); 97 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 98 int (*init)(struct net *net, struct nlattr *nla, 99 struct nlattr *est, struct tc_action **act, int ovr, 100 int bind, bool rtnl_held, struct tcf_proto *tp, 101 u32 flags, struct netlink_ext_ack *extack); 102 int (*walk)(struct net *, struct sk_buff *, 103 struct netlink_callback *, int, 104 const struct tc_action_ops *, 105 struct netlink_ext_ack *); 106 void (*stats_update)(struct tc_action *, u64, u32, u64, bool); 107 size_t (*get_fill_size)(const struct tc_action *act); 108 struct net_device *(*get_dev)(const struct tc_action *a, 109 tc_action_priv_destructor *destructor); 110 struct psample_group * 111 (*get_psample_group)(const struct tc_action *a, 112 tc_action_priv_destructor *destructor); 113 }; 114 115 struct tc_action_net { 116 struct tcf_idrinfo *idrinfo; 117 const struct tc_action_ops *ops; 118 }; 119 120 static inline 121 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 122 const struct tc_action_ops *ops) 123 { 124 int err = 0; 125 126 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 127 if (!tn->idrinfo) 128 return -ENOMEM; 129 tn->ops = ops; 130 tn->idrinfo->net = net; 131 mutex_init(&tn->idrinfo->lock); 132 idr_init(&tn->idrinfo->action_idr); 133 return err; 134 } 135 136 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 137 struct tcf_idrinfo *idrinfo); 138 139 static inline void tc_action_net_exit(struct list_head *net_list, 140 unsigned int id) 141 { 142 struct net *net; 143 144 rtnl_lock(); 145 list_for_each_entry(net, net_list, exit_list) { 146 struct tc_action_net *tn = net_generic(net, id); 147 148 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 149 kfree(tn->idrinfo); 150 } 151 rtnl_unlock(); 152 } 153 154 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 155 struct netlink_callback *cb, int type, 156 const struct tc_action_ops *ops, 157 struct netlink_ext_ack *extack); 158 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 159 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 160 struct tc_action **a, const struct tc_action_ops *ops, 161 int bind, bool cpustats, u32 flags); 162 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 163 struct nlattr *est, struct tc_action **a, 164 const struct tc_action_ops *ops, int bind, 165 u32 flags); 166 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a); 167 168 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 169 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 170 struct tc_action **a, int bind); 171 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict); 172 173 static inline int tcf_idr_release(struct tc_action *a, bool bind) 174 { 175 return __tcf_idr_release(a, bind, false); 176 } 177 178 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 179 int tcf_unregister_action(struct tc_action_ops *a, 180 struct pernet_operations *ops); 181 int tcf_action_destroy(struct tc_action *actions[], int bind); 182 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 183 int nr_actions, struct tcf_result *res); 184 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 185 struct nlattr *est, char *name, int ovr, int bind, 186 struct tc_action *actions[], size_t *attr_size, 187 bool rtnl_held, struct netlink_ext_ack *extack); 188 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 189 struct nlattr *nla, struct nlattr *est, 190 char *name, int ovr, int bind, 191 bool rtnl_held, 192 struct netlink_ext_ack *extack); 193 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 194 int ref); 195 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 196 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 197 198 static inline void tcf_action_update_bstats(struct tc_action *a, 199 struct sk_buff *skb) 200 { 201 if (likely(a->cpu_bstats)) { 202 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb); 203 return; 204 } 205 spin_lock(&a->tcfa_lock); 206 bstats_update(&a->tcfa_bstats, skb); 207 spin_unlock(&a->tcfa_lock); 208 } 209 210 static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 211 { 212 if (likely(a->cpu_qstats)) { 213 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 214 return; 215 } 216 spin_lock(&a->tcfa_lock); 217 qstats_drop_inc(&a->tcfa_qstats); 218 spin_unlock(&a->tcfa_lock); 219 } 220 221 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 222 { 223 if (likely(a->cpu_qstats)) { 224 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 225 return; 226 } 227 spin_lock(&a->tcfa_lock); 228 qstats_overlimit_inc(&a->tcfa_qstats); 229 spin_unlock(&a->tcfa_lock); 230 } 231 232 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u32 packets, 233 bool drop, bool hw); 234 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 235 236 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 237 struct tcf_chain **handle, 238 struct netlink_ext_ack *newchain); 239 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 240 struct tcf_chain *newchain); 241 #endif /* CONFIG_NET_CLS_ACT */ 242 243 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 244 u64 packets, u64 lastuse, bool hw) 245 { 246 #ifdef CONFIG_NET_CLS_ACT 247 if (!a->ops->stats_update) 248 return; 249 250 a->ops->stats_update(a, bytes, packets, lastuse, hw); 251 #endif 252 } 253 254 255 #endif 256