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 spinlock_t lock; 17 struct idr action_idr; 18 }; 19 20 struct tc_action_ops; 21 22 struct tc_action { 23 const struct tc_action_ops *ops; 24 __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ 25 __u32 order; 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_queue tcfa_qstats; 35 struct net_rate_estimator __rcu *tcfa_rate_est; 36 spinlock_t tcfa_lock; 37 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 38 struct gnet_stats_queue __percpu *cpu_qstats; 39 struct tc_cookie __rcu *act_cookie; 40 struct tcf_chain *goto_chain; 41 }; 42 #define tcf_index common.tcfa_index 43 #define tcf_refcnt common.tcfa_refcnt 44 #define tcf_bindcnt common.tcfa_bindcnt 45 #define tcf_action common.tcfa_action 46 #define tcf_tm common.tcfa_tm 47 #define tcf_bstats common.tcfa_bstats 48 #define tcf_qstats common.tcfa_qstats 49 #define tcf_rate_est common.tcfa_rate_est 50 #define tcf_lock common.tcfa_lock 51 52 /* Update lastuse only if needed, to avoid dirtying a cache line. 53 * We use a temp variable to avoid fetching jiffies twice. 54 */ 55 static inline void tcf_lastuse_update(struct tcf_t *tm) 56 { 57 unsigned long now = jiffies; 58 59 if (tm->lastuse != now) 60 tm->lastuse = now; 61 if (unlikely(!tm->firstuse)) 62 tm->firstuse = now; 63 } 64 65 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 66 { 67 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 68 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 69 dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); 70 dtm->expires = jiffies_to_clock_t(stm->expires); 71 } 72 73 #ifdef CONFIG_NET_CLS_ACT 74 75 #define ACT_P_CREATED 1 76 #define ACT_P_DELETED 1 77 78 struct tc_action_ops { 79 struct list_head head; 80 char kind[IFNAMSIZ]; 81 __u32 type; /* TBD to match kind */ 82 size_t size; 83 struct module *owner; 84 int (*act)(struct sk_buff *, const struct tc_action *, 85 struct tcf_result *); /* called under RCU BH lock*/ 86 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 87 void (*cleanup)(struct tc_action *); 88 int (*lookup)(struct net *net, struct tc_action **a, u32 index, 89 struct netlink_ext_ack *extack); 90 int (*init)(struct net *net, struct nlattr *nla, 91 struct nlattr *est, struct tc_action **act, int ovr, 92 int bind, bool rtnl_held, 93 struct netlink_ext_ack *extack); 94 int (*walk)(struct net *, struct sk_buff *, 95 struct netlink_callback *, int, 96 const struct tc_action_ops *, 97 struct netlink_ext_ack *); 98 void (*stats_update)(struct tc_action *, u64, u32, u64); 99 size_t (*get_fill_size)(const struct tc_action *act); 100 struct net_device *(*get_dev)(const struct tc_action *a); 101 void (*put_dev)(struct net_device *dev); 102 }; 103 104 struct tc_action_net { 105 struct tcf_idrinfo *idrinfo; 106 const struct tc_action_ops *ops; 107 }; 108 109 static inline 110 int tc_action_net_init(struct tc_action_net *tn, 111 const struct tc_action_ops *ops) 112 { 113 int err = 0; 114 115 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 116 if (!tn->idrinfo) 117 return -ENOMEM; 118 tn->ops = ops; 119 spin_lock_init(&tn->idrinfo->lock); 120 idr_init(&tn->idrinfo->action_idr); 121 return err; 122 } 123 124 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 125 struct tcf_idrinfo *idrinfo); 126 127 static inline void tc_action_net_exit(struct list_head *net_list, 128 unsigned int id) 129 { 130 struct net *net; 131 132 rtnl_lock(); 133 list_for_each_entry(net, net_list, exit_list) { 134 struct tc_action_net *tn = net_generic(net, id); 135 136 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 137 kfree(tn->idrinfo); 138 } 139 rtnl_unlock(); 140 } 141 142 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 143 struct netlink_callback *cb, int type, 144 const struct tc_action_ops *ops, 145 struct netlink_ext_ack *extack); 146 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 147 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 148 struct tc_action **a, const struct tc_action_ops *ops, 149 int bind, bool cpustats); 150 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a); 151 152 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 153 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 154 struct tc_action **a, int bind); 155 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict); 156 157 static inline int tcf_idr_release(struct tc_action *a, bool bind) 158 { 159 return __tcf_idr_release(a, bind, false); 160 } 161 162 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 163 int tcf_unregister_action(struct tc_action_ops *a, 164 struct pernet_operations *ops); 165 int tcf_action_destroy(struct tc_action *actions[], int bind); 166 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 167 int nr_actions, struct tcf_result *res); 168 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 169 struct nlattr *est, char *name, int ovr, int bind, 170 struct tc_action *actions[], size_t *attr_size, 171 bool rtnl_held, struct netlink_ext_ack *extack); 172 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 173 struct nlattr *nla, struct nlattr *est, 174 char *name, int ovr, int bind, 175 bool rtnl_held, 176 struct netlink_ext_ack *extack); 177 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 178 int ref); 179 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 180 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 181 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 182 183 #endif /* CONFIG_NET_CLS_ACT */ 184 185 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 186 u64 packets, u64 lastuse) 187 { 188 #ifdef CONFIG_NET_CLS_ACT 189 if (!a->ops->stats_update) 190 return; 191 192 a->ops->stats_update(a, bytes, packets, lastuse); 193 #endif 194 } 195 196 #ifdef CONFIG_NET_CLS_ACT 197 int tc_setup_cb_egdev_register(const struct net_device *dev, 198 tc_setup_cb_t *cb, void *cb_priv); 199 void tc_setup_cb_egdev_unregister(const struct net_device *dev, 200 tc_setup_cb_t *cb, void *cb_priv); 201 int tc_setup_cb_egdev_call(const struct net_device *dev, 202 enum tc_setup_type type, void *type_data, 203 bool err_stop); 204 #else 205 static inline 206 int tc_setup_cb_egdev_register(const struct net_device *dev, 207 tc_setup_cb_t *cb, void *cb_priv) 208 { 209 return 0; 210 } 211 212 static inline 213 void tc_setup_cb_egdev_unregister(const struct net_device *dev, 214 tc_setup_cb_t *cb, void *cb_priv) 215 { 216 } 217 218 static inline 219 int tc_setup_cb_egdev_call(const struct net_device *dev, 220 enum tc_setup_type type, void *type_data, 221 bool err_stop) 222 { 223 return 0; 224 } 225 #endif 226 227 #endif 228