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 }; 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_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 *goto_chain; 43 }; 44 #define tcf_index common.tcfa_index 45 #define tcf_refcnt common.tcfa_refcnt 46 #define tcf_bindcnt common.tcfa_bindcnt 47 #define tcf_action common.tcfa_action 48 #define tcf_tm common.tcfa_tm 49 #define tcf_bstats common.tcfa_bstats 50 #define tcf_qstats common.tcfa_qstats 51 #define tcf_rate_est common.tcfa_rate_est 52 #define tcf_lock common.tcfa_lock 53 54 /* Update lastuse only if needed, to avoid dirtying a cache line. 55 * We use a temp variable to avoid fetching jiffies twice. 56 */ 57 static inline void tcf_lastuse_update(struct tcf_t *tm) 58 { 59 unsigned long now = jiffies; 60 61 if (tm->lastuse != now) 62 tm->lastuse = now; 63 if (unlikely(!tm->firstuse)) 64 tm->firstuse = now; 65 } 66 67 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 68 { 69 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 70 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 71 dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); 72 dtm->expires = jiffies_to_clock_t(stm->expires); 73 } 74 75 #ifdef CONFIG_NET_CLS_ACT 76 77 #define ACT_P_CREATED 1 78 #define ACT_P_DELETED 1 79 80 struct tc_action_ops { 81 struct list_head head; 82 char kind[IFNAMSIZ]; 83 __u32 type; /* TBD to match kind */ 84 size_t size; 85 struct module *owner; 86 int (*act)(struct sk_buff *, const struct tc_action *, 87 struct tcf_result *); /* called under RCU BH lock*/ 88 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 89 void (*cleanup)(struct tc_action *); 90 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 91 int (*init)(struct net *net, struct nlattr *nla, 92 struct nlattr *est, struct tc_action **act, int ovr, 93 int bind, bool rtnl_held, 94 struct netlink_ext_ack *extack); 95 int (*walk)(struct net *, struct sk_buff *, 96 struct netlink_callback *, int, 97 const struct tc_action_ops *, 98 struct netlink_ext_ack *); 99 void (*stats_update)(struct tc_action *, u64, u32, u64, bool); 100 size_t (*get_fill_size)(const struct tc_action *act); 101 struct net_device *(*get_dev)(const struct tc_action *a); 102 void (*put_dev)(struct net_device *dev); 103 }; 104 105 struct tc_action_net { 106 struct tcf_idrinfo *idrinfo; 107 const struct tc_action_ops *ops; 108 }; 109 110 static inline 111 int tc_action_net_init(struct tc_action_net *tn, 112 const struct tc_action_ops *ops) 113 { 114 int err = 0; 115 116 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 117 if (!tn->idrinfo) 118 return -ENOMEM; 119 tn->ops = ops; 120 mutex_init(&tn->idrinfo->lock); 121 idr_init(&tn->idrinfo->action_idr); 122 return err; 123 } 124 125 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 126 struct tcf_idrinfo *idrinfo); 127 128 static inline void tc_action_net_exit(struct list_head *net_list, 129 unsigned int id) 130 { 131 struct net *net; 132 133 rtnl_lock(); 134 list_for_each_entry(net, net_list, exit_list) { 135 struct tc_action_net *tn = net_generic(net, id); 136 137 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 138 kfree(tn->idrinfo); 139 } 140 rtnl_unlock(); 141 } 142 143 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 144 struct netlink_callback *cb, int type, 145 const struct tc_action_ops *ops, 146 struct netlink_ext_ack *extack); 147 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 148 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 149 struct tc_action **a, const struct tc_action_ops *ops, 150 int bind, bool cpustats); 151 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a); 152 153 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 154 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 155 struct tc_action **a, int bind); 156 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict); 157 158 static inline int tcf_idr_release(struct tc_action *a, bool bind) 159 { 160 return __tcf_idr_release(a, bind, false); 161 } 162 163 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 164 int tcf_unregister_action(struct tc_action_ops *a, 165 struct pernet_operations *ops); 166 int tcf_action_destroy(struct tc_action *actions[], int bind); 167 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 168 int nr_actions, struct tcf_result *res); 169 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 170 struct nlattr *est, char *name, int ovr, int bind, 171 struct tc_action *actions[], size_t *attr_size, 172 bool rtnl_held, struct netlink_ext_ack *extack); 173 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 174 struct nlattr *nla, struct nlattr *est, 175 char *name, int ovr, int bind, 176 bool rtnl_held, 177 struct netlink_ext_ack *extack); 178 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 179 int ref); 180 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 181 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 182 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 183 184 #endif /* CONFIG_NET_CLS_ACT */ 185 186 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 187 u64 packets, u64 lastuse, bool hw) 188 { 189 #ifdef CONFIG_NET_CLS_ACT 190 if (!a->ops->stats_update) 191 return; 192 193 a->ops->stats_update(a, bytes, packets, lastuse, hw); 194 #endif 195 } 196 197 #ifdef CONFIG_NET_CLS_ACT 198 int tc_setup_cb_egdev_register(const struct net_device *dev, 199 tc_setup_cb_t *cb, void *cb_priv); 200 void tc_setup_cb_egdev_unregister(const struct net_device *dev, 201 tc_setup_cb_t *cb, void *cb_priv); 202 int tc_setup_cb_egdev_call(const struct net_device *dev, 203 enum tc_setup_type type, void *type_data, 204 bool err_stop); 205 #else 206 static inline 207 int tc_setup_cb_egdev_register(const struct net_device *dev, 208 tc_setup_cb_t *cb, void *cb_priv) 209 { 210 return 0; 211 } 212 213 static inline 214 void tc_setup_cb_egdev_unregister(const struct net_device *dev, 215 tc_setup_cb_t *cb, void *cb_priv) 216 { 217 } 218 219 static inline 220 int tc_setup_cb_egdev_call(const struct net_device *dev, 221 enum tc_setup_type type, void *type_data, 222 bool err_stop) 223 { 224 return 0; 225 } 226 #endif 227 228 #endif 229