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 list_head list; 27 struct tcf_idrinfo *idrinfo; 28 29 u32 tcfa_index; 30 refcount_t tcfa_refcnt; 31 atomic_t tcfa_bindcnt; 32 u32 tcfa_capab; 33 int tcfa_action; 34 struct tcf_t tcfa_tm; 35 struct gnet_stats_basic_packed tcfa_bstats; 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_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_capab common.tcfa_capab 48 #define tcf_action common.tcfa_action 49 #define tcf_tm common.tcfa_tm 50 #define tcf_bstats common.tcfa_bstats 51 #define tcf_qstats common.tcfa_qstats 52 #define tcf_rate_est common.tcfa_rate_est 53 #define tcf_lock common.tcfa_lock 54 55 /* Update lastuse only if needed, to avoid dirtying a cache line. 56 * We use a temp variable to avoid fetching jiffies twice. 57 */ 58 static inline void tcf_lastuse_update(struct tcf_t *tm) 59 { 60 unsigned long now = jiffies; 61 62 if (tm->lastuse != now) 63 tm->lastuse = now; 64 if (unlikely(!tm->firstuse)) 65 tm->firstuse = now; 66 } 67 68 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 69 { 70 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 71 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 72 dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); 73 dtm->expires = jiffies_to_clock_t(stm->expires); 74 } 75 76 #ifdef CONFIG_NET_CLS_ACT 77 78 #define ACT_P_CREATED 1 79 #define ACT_P_DELETED 1 80 81 struct tc_action_ops { 82 struct list_head head; 83 char kind[IFNAMSIZ]; 84 __u32 type; /* TBD to match kind */ 85 size_t size; 86 struct module *owner; 87 int (*act)(struct sk_buff *, const struct tc_action *, 88 struct tcf_result *); /* called under RCU BH lock*/ 89 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 90 void (*cleanup)(struct tc_action *); 91 int (*lookup)(struct net *net, struct tc_action **a, u32 index, 92 struct netlink_ext_ack *extack); 93 int (*init)(struct net *net, struct nlattr *nla, 94 struct nlattr *est, struct tc_action **act, int ovr, 95 int bind, bool rtnl_held, 96 struct netlink_ext_ack *extack); 97 int (*walk)(struct net *, struct sk_buff *, 98 struct netlink_callback *, int, 99 const struct tc_action_ops *, 100 struct netlink_ext_ack *); 101 void (*stats_update)(struct tc_action *, u64, u32, u64); 102 size_t (*get_fill_size)(const struct tc_action *act); 103 struct net_device *(*get_dev)(const struct tc_action *a); 104 void (*put_dev)(struct net_device *dev); 105 int (*delete)(struct net *net, u32 index); 106 }; 107 108 struct tc_action_net { 109 struct tcf_idrinfo *idrinfo; 110 const struct tc_action_ops *ops; 111 }; 112 113 static inline 114 int tc_action_net_init(struct tc_action_net *tn, 115 const struct tc_action_ops *ops) 116 { 117 int err = 0; 118 119 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 120 if (!tn->idrinfo) 121 return -ENOMEM; 122 tn->ops = ops; 123 spin_lock_init(&tn->idrinfo->lock); 124 idr_init(&tn->idrinfo->action_idr); 125 return err; 126 } 127 128 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 129 struct tcf_idrinfo *idrinfo); 130 131 static inline void tc_action_net_exit(struct list_head *net_list, 132 unsigned int id) 133 { 134 struct net *net; 135 136 rtnl_lock(); 137 list_for_each_entry(net, net_list, exit_list) { 138 struct tc_action_net *tn = net_generic(net, id); 139 140 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 141 kfree(tn->idrinfo); 142 } 143 rtnl_unlock(); 144 } 145 146 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 147 struct netlink_callback *cb, int type, 148 const struct tc_action_ops *ops, 149 struct netlink_ext_ack *extack); 150 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 151 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a, 152 int bind); 153 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 154 struct tc_action **a, const struct tc_action_ops *ops, 155 int bind, bool cpustats); 156 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a); 157 158 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 159 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 160 struct tc_action **a, int bind); 161 int tcf_idr_delete_index(struct tc_action_net *tn, u32 index); 162 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict); 163 164 static inline int tcf_idr_release(struct tc_action *a, bool bind) 165 { 166 return __tcf_idr_release(a, bind, false); 167 } 168 169 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 170 int tcf_unregister_action(struct tc_action_ops *a, 171 struct pernet_operations *ops); 172 int tcf_action_destroy(struct tc_action *actions[], int bind); 173 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 174 int nr_actions, struct tcf_result *res); 175 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 176 struct nlattr *est, char *name, int ovr, int bind, 177 struct tc_action *actions[], size_t *attr_size, 178 bool rtnl_held, struct netlink_ext_ack *extack); 179 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 180 struct nlattr *nla, struct nlattr *est, 181 char *name, int ovr, int bind, 182 bool rtnl_held, 183 struct netlink_ext_ack *extack); 184 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 185 int ref); 186 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 187 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 188 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 189 190 #endif /* CONFIG_NET_CLS_ACT */ 191 192 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 193 u64 packets, u64 lastuse) 194 { 195 #ifdef CONFIG_NET_CLS_ACT 196 if (!a->ops->stats_update) 197 return; 198 199 a->ops->stats_update(a, bytes, packets, lastuse); 200 #endif 201 } 202 203 #ifdef CONFIG_NET_CLS_ACT 204 int tc_setup_cb_egdev_register(const struct net_device *dev, 205 tc_setup_cb_t *cb, void *cb_priv); 206 void tc_setup_cb_egdev_unregister(const struct net_device *dev, 207 tc_setup_cb_t *cb, void *cb_priv); 208 int tc_setup_cb_egdev_call(const struct net_device *dev, 209 enum tc_setup_type type, void *type_data, 210 bool err_stop); 211 #else 212 static inline 213 int tc_setup_cb_egdev_register(const struct net_device *dev, 214 tc_setup_cb_t *cb, void *cb_priv) 215 { 216 return 0; 217 } 218 219 static inline 220 void tc_setup_cb_egdev_unregister(const struct net_device *dev, 221 tc_setup_cb_t *cb, void *cb_priv) 222 { 223 } 224 225 static inline 226 int tc_setup_cb_egdev_call(const struct net_device *dev, 227 enum tc_setup_type type, void *type_data, 228 bool err_stop) 229 { 230 return 0; 231 } 232 #endif 233 234 #endif 235