act_api.h (9384B)
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/flow_offload.h> 11#include <net/sch_generic.h> 12#include <net/pkt_sched.h> 13#include <net/net_namespace.h> 14#include <net/netns/generic.h> 15 16struct tcf_idrinfo { 17 struct mutex lock; 18 struct idr action_idr; 19 struct net *net; 20}; 21 22struct tc_action_ops; 23 24struct tc_action { 25 const struct tc_action_ops *ops; 26 __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ 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_sync tcfa_bstats; 35 struct gnet_stats_basic_sync 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_sync __percpu *cpu_bstats; 40 struct gnet_stats_basic_sync __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 u32 tcfa_flags; 45 u8 hw_stats; 46 u8 used_hw_stats; 47 bool used_hw_stats_valid; 48 u32 in_hw_count; 49}; 50#define tcf_index common.tcfa_index 51#define tcf_refcnt common.tcfa_refcnt 52#define tcf_bindcnt common.tcfa_bindcnt 53#define tcf_action common.tcfa_action 54#define tcf_tm common.tcfa_tm 55#define tcf_bstats common.tcfa_bstats 56#define tcf_qstats common.tcfa_qstats 57#define tcf_rate_est common.tcfa_rate_est 58#define tcf_lock common.tcfa_lock 59 60#define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \ 61 TCA_ACT_HW_STATS_DELAYED) 62 63/* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */ 64#define TCA_ACT_FLAGS_USER_BITS 16 65#define TCA_ACT_FLAGS_USER_MASK 0xffff 66#define TCA_ACT_FLAGS_POLICE (1U << TCA_ACT_FLAGS_USER_BITS) 67#define TCA_ACT_FLAGS_BIND (1U << (TCA_ACT_FLAGS_USER_BITS + 1)) 68#define TCA_ACT_FLAGS_REPLACE (1U << (TCA_ACT_FLAGS_USER_BITS + 2)) 69#define TCA_ACT_FLAGS_NO_RTNL (1U << (TCA_ACT_FLAGS_USER_BITS + 3)) 70 71/* Update lastuse only if needed, to avoid dirtying a cache line. 72 * We use a temp variable to avoid fetching jiffies twice. 73 */ 74static inline void tcf_lastuse_update(struct tcf_t *tm) 75{ 76 unsigned long now = jiffies; 77 78 if (tm->lastuse != now) 79 tm->lastuse = now; 80 if (unlikely(!tm->firstuse)) 81 tm->firstuse = now; 82} 83 84static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) 85{ 86 dtm->install = jiffies_to_clock_t(jiffies - stm->install); 87 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); 88 dtm->firstuse = stm->firstuse ? 89 jiffies_to_clock_t(jiffies - stm->firstuse) : 0; 90 dtm->expires = jiffies_to_clock_t(stm->expires); 91} 92 93static inline enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats) 94{ 95 if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY)) 96 return FLOW_ACTION_HW_STATS_DONT_CARE; 97 else if (!hw_stats) 98 return FLOW_ACTION_HW_STATS_DISABLED; 99 100 return hw_stats; 101} 102 103#ifdef CONFIG_NET_CLS_ACT 104 105#define ACT_P_CREATED 1 106#define ACT_P_DELETED 1 107 108typedef void (*tc_action_priv_destructor)(void *priv); 109 110struct tc_action_ops { 111 struct list_head head; 112 char kind[IFNAMSIZ]; 113 enum tca_id id; /* identifier should match kind */ 114 size_t size; 115 struct module *owner; 116 int (*act)(struct sk_buff *, const struct tc_action *, 117 struct tcf_result *); /* called under RCU BH lock*/ 118 int (*dump)(struct sk_buff *, struct tc_action *, int, int); 119 void (*cleanup)(struct tc_action *); 120 int (*lookup)(struct net *net, struct tc_action **a, u32 index); 121 int (*init)(struct net *net, struct nlattr *nla, 122 struct nlattr *est, struct tc_action **act, 123 struct tcf_proto *tp, 124 u32 flags, struct netlink_ext_ack *extack); 125 int (*walk)(struct net *, struct sk_buff *, 126 struct netlink_callback *, int, 127 const struct tc_action_ops *, 128 struct netlink_ext_ack *); 129 void (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool); 130 size_t (*get_fill_size)(const struct tc_action *act); 131 struct net_device *(*get_dev)(const struct tc_action *a, 132 tc_action_priv_destructor *destructor); 133 struct psample_group * 134 (*get_psample_group)(const struct tc_action *a, 135 tc_action_priv_destructor *destructor); 136 int (*offload_act_setup)(struct tc_action *act, void *entry_data, 137 u32 *index_inc, bool bind, 138 struct netlink_ext_ack *extack); 139}; 140 141struct tc_action_net { 142 struct tcf_idrinfo *idrinfo; 143 const struct tc_action_ops *ops; 144}; 145 146static inline 147int tc_action_net_init(struct net *net, struct tc_action_net *tn, 148 const struct tc_action_ops *ops) 149{ 150 int err = 0; 151 152 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL); 153 if (!tn->idrinfo) 154 return -ENOMEM; 155 tn->ops = ops; 156 tn->idrinfo->net = net; 157 mutex_init(&tn->idrinfo->lock); 158 idr_init(&tn->idrinfo->action_idr); 159 return err; 160} 161 162void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 163 struct tcf_idrinfo *idrinfo); 164 165static inline void tc_action_net_exit(struct list_head *net_list, 166 unsigned int id) 167{ 168 struct net *net; 169 170 rtnl_lock(); 171 list_for_each_entry(net, net_list, exit_list) { 172 struct tc_action_net *tn = net_generic(net, id); 173 174 tcf_idrinfo_destroy(tn->ops, tn->idrinfo); 175 kfree(tn->idrinfo); 176 } 177 rtnl_unlock(); 178} 179 180int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 181 struct netlink_callback *cb, int type, 182 const struct tc_action_ops *ops, 183 struct netlink_ext_ack *extack); 184int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index); 185int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 186 struct tc_action **a, const struct tc_action_ops *ops, 187 int bind, bool cpustats, u32 flags); 188int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 189 struct nlattr *est, struct tc_action **a, 190 const struct tc_action_ops *ops, int bind, 191 u32 flags); 192void tcf_idr_insert_many(struct tc_action *actions[]); 193void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); 194int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 195 struct tc_action **a, int bind); 196int tcf_idr_release(struct tc_action *a, bool bind); 197 198int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); 199int tcf_unregister_action(struct tc_action_ops *a, 200 struct pernet_operations *ops); 201int tcf_action_destroy(struct tc_action *actions[], int bind); 202int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 203 int nr_actions, struct tcf_result *res); 204int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 205 struct nlattr *est, 206 struct tc_action *actions[], int init_res[], size_t *attr_size, 207 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack); 208struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, 209 bool rtnl_held, 210 struct netlink_ext_ack *extack); 211struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 212 struct nlattr *nla, struct nlattr *est, 213 struct tc_action_ops *a_o, int *init_res, 214 u32 flags, struct netlink_ext_ack *extack); 215int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind, 216 int ref, bool terse); 217int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); 218int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); 219 220static inline void tcf_action_update_bstats(struct tc_action *a, 221 struct sk_buff *skb) 222{ 223 if (likely(a->cpu_bstats)) { 224 bstats_update(this_cpu_ptr(a->cpu_bstats), skb); 225 return; 226 } 227 spin_lock(&a->tcfa_lock); 228 bstats_update(&a->tcfa_bstats, skb); 229 spin_unlock(&a->tcfa_lock); 230} 231 232static inline void tcf_action_inc_drop_qstats(struct tc_action *a) 233{ 234 if (likely(a->cpu_qstats)) { 235 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats)); 236 return; 237 } 238 spin_lock(&a->tcfa_lock); 239 qstats_drop_inc(&a->tcfa_qstats); 240 spin_unlock(&a->tcfa_lock); 241} 242 243static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a) 244{ 245 if (likely(a->cpu_qstats)) { 246 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats)); 247 return; 248 } 249 spin_lock(&a->tcfa_lock); 250 qstats_overlimit_inc(&a->tcfa_qstats); 251 spin_unlock(&a->tcfa_lock); 252} 253 254void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, 255 u64 drops, bool hw); 256int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); 257 258int tcf_action_update_hw_stats(struct tc_action *action); 259int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, 260 void *cb_priv, bool add); 261int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 262 struct tcf_chain **handle, 263 struct netlink_ext_ack *newchain); 264struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 265 struct tcf_chain *newchain); 266 267#ifdef CONFIG_INET 268DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count); 269#endif 270 271int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 272 273#else /* !CONFIG_NET_CLS_ACT */ 274 275static inline int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, 276 void *cb_priv, bool add) { 277 return 0; 278} 279 280#endif /* CONFIG_NET_CLS_ACT */ 281 282static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, 283 u64 packets, u64 drops, 284 u64 lastuse, bool hw) 285{ 286#ifdef CONFIG_NET_CLS_ACT 287 if (!a->ops->stats_update) 288 return; 289 290 a->ops->stats_update(a, bytes, packets, drops, lastuse, hw); 291#endif 292} 293 294 295#endif