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 }; 45 #define tcf_index common.tcfa_index 46 #define tcf_refcnt common.tcfa_refcnt 47 #define tcf_bindcnt common.tcfa_bindcnt 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 enum tca_id id; /* identifier should 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 int (*init)(struct net *net, struct nlattr *nla, 93 struct nlattr *est, struct tc_action **act, int ovr, 94 int bind, bool rtnl_held, struct tcf_proto *tp, 95 struct netlink_ext_ack *extack); 96 int (*walk)(struct net *, struct sk_buff *, 97 struct netlink_callback *, int, 98 const struct tc_action_ops *, 99 struct netlink_ext_ack *); 100 void (*stats_update)(struct tc_action *, u64, u32, u64, bool); 101 size_t (*get_fill_size)(const struct tc_action *act); 102 struct net_device *(*get_dev)(const struct tc_action *a); 103 void (*put_dev)(struct net_device *dev); 104 }; 105 106 struct tc_action_net { 107 struct tcf_idrinfo *idrinfo; 108 const struct tc_action_ops *ops; 109 }; 110 111 static inline 112 int tc_action_net_init(struct net *net, struct tc_action_net *tn, 113 const struct tc_action_ops *ops) 114 { 115 int err = 0; 116 117 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 118 if (!tn->idrinfo) 119 return -ENOMEM; 120 tn->ops = ops; 121 tn->idrinfo->net = net; 122 mutex_init(&tn->idrinfo->lock); 123 idr_init(&tn->idrinfo->action_idr); 124 return err; 125 } 126 127 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 128 struct tcf_idrinfo *idrinfo); 129 130 static inline void tc_action_net_exit(struct list_head *net_list, 131 unsigned int id) 132 { 133 struct net *net; 134 135 rtnl_lock(); 136 list_for_each_entry(net, net_list, exit_list) { 137 struct tc_action_net *tn = net_generic(net, id); 138 139 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 140 kfree(tn->idrinfo); 141 } 142 rtnl_unlock(); 143 } 144 145 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 146 struct netlink_callback *cb, int type, 147 const struct tc_action_ops *ops, 148 struct netlink_ext_ack *extack); 149 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 150 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 151 struct tc_action **a, const struct tc_action_ops *ops, 152 int bind, bool cpustats); 153 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a); 154 155 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 156 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 157 struct tc_action **a, int bind); 158 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict); 159 160 static inline int tcf_idr_release(struct tc_action *a, bool bind) 161 { 162 return __tcf_idr_release(a, bind, false); 163 } 164 165 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 166 int tcf_unregister_action(struct tc_action_ops *a, 167 struct pernet_operations *ops); 168 int tcf_action_destroy(struct tc_action *actions[], int bind); 169 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 170 int nr_actions, struct tcf_result *res); 171 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 172 struct nlattr *est, char *name, int ovr, int bind, 173 struct tc_action *actions[], size_t *attr_size, 174 bool rtnl_held, struct netlink_ext_ack *extack); 175 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 176 struct nlattr *nla, struct nlattr *est, 177 char *name, int ovr, int bind, 178 bool rtnl_held, 179 struct netlink_ext_ack *extack); 180 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 181 int ref); 182 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 183 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 184 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 185 186 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 187 struct tcf_chain **handle, 188 struct netlink_ext_ack *newchain); 189 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 190 struct tcf_chain *newchain); 191 #endif /* CONFIG_NET_CLS_ACT */ 192 193 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 194 u64 packets, u64 lastuse, bool hw) 195 { 196 #ifdef CONFIG_NET_CLS_ACT 197 if (!a->ops->stats_update) 198 return; 199 200 a->ops->stats_update(a, bytes, packets, lastuse, hw); 201 #endif 202 } 203 204 205 #endif 206