diff options
Diffstat (limited to 'net/sched/act_api.c')
| -rw-r--r-- | net/sched/act_api.c | 1739 |
1 files changed, 1739 insertions, 0 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c new file mode 100644 index 000000000..ad0773b20 --- /dev/null +++ b/net/sched/act_api.c @@ -0,0 +1,1739 @@ +/* + * net/sched/act_api.c Packet action API. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Author: Jamal Hadi Salim + * + * + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/skbuff.h> +#include <linux/init.h> +#include <linux/kmod.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/rhashtable.h> +#include <linux/list.h> +#include <net/net_namespace.h> +#include <net/sock.h> +#include <net/sch_generic.h> +#include <net/pkt_cls.h> +#include <net/act_api.h> +#include <net/netlink.h> + +static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp) +{ + u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK; + + if (!tp) + return -EINVAL; + a->goto_chain = tcf_chain_get_by_act(tp->chain->block, chain_index); + if (!a->goto_chain) + return -ENOMEM; + return 0; +} + +static void tcf_action_goto_chain_fini(struct tc_action *a) +{ + tcf_chain_put_by_act(a->goto_chain); +} + +static void tcf_action_goto_chain_exec(const struct tc_action *a, + struct tcf_result *res) +{ + const struct tcf_chain *chain = a->goto_chain; + + res->goto_tp = rcu_dereference_bh(chain->filter_chain); +} + +static void tcf_free_cookie_rcu(struct rcu_head *p) +{ + struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu); + + kfree(cookie->data); + kfree(cookie); +} + +static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie, + struct tc_cookie *new_cookie) +{ + struct tc_cookie *old; + + old = xchg((__force struct tc_cookie **)old_cookie, new_cookie); + if (old) + call_rcu(&old->rcu, tcf_free_cookie_rcu); +} + +/* XXX: For standalone actions, we don't need a RCU grace period either, because + * actions are always connected to filters and filters are already destroyed in + * RCU callbacks, so after a RCU grace period actions are already disconnected + * from filters. Readers later can not find us. + */ +static void free_tcf(struct tc_action *p) +{ + free_percpu(p->cpu_bstats); + free_percpu(p->cpu_qstats); + + tcf_set_action_cookie(&p->act_cookie, NULL); + if (p->goto_chain) + tcf_action_goto_chain_fini(p); + + kfree(p); +} + +static void tcf_action_cleanup(struct tc_action *p) +{ + if (p->ops->cleanup) + p->ops->cleanup(p); + + gen_kill_estimator(&p->tcfa_rate_est); + free_tcf(p); +} + +static int __tcf_action_put(struct tc_action *p, bool bind) +{ + struct tcf_idrinfo *idrinfo = p->idrinfo; + + if (refcount_dec_and_lock(&p->tcfa_refcnt, &idrinfo->lock)) { + if (bind) + atomic_dec(&p->tcfa_bindcnt); + idr_remove(&idrinfo->action_idr, p->tcfa_index); + spin_unlock(&idrinfo->lock); + + tcf_action_cleanup(p); + return 1; + } + + if (bind) + atomic_dec(&p->tcfa_bindcnt); + + return 0; +} + +int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) +{ + int ret = 0; + + /* Release with strict==1 and bind==0 is only called through act API + * interface (classifiers always bind). Only case when action with + * positive reference count and zero bind count can exist is when it was + * also created with act API (unbinding last classifier will destroy the + * action if it was created by classifier). So only case when bind count + * can be changed after initial check is when unbound action is + * destroyed by act API while classifier binds to action with same id + * concurrently. This result either creation of new action(same behavior + * as before), or reusing existing action if concurrent process + * increments reference count before action is deleted. Both scenarios + * are acceptable. + */ + if (p) { + if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0) + return -EPERM; + + if (__tcf_action_put(p, bind)) + ret = ACT_P_DELETED; + } + + return ret; +} +EXPORT_SYMBOL(__tcf_idr_release); + +static size_t tcf_action_shared_attrs_size(const struct tc_action *act) +{ + struct tc_cookie *act_cookie; + u32 cookie_len = 0; + + rcu_read_lock(); + act_cookie = rcu_dereference(act->act_cookie); + + if (act_cookie) + cookie_len = nla_total_size(act_cookie->len); + rcu_read_unlock(); + + return nla_total_size(0) /* action number nested */ + + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ + + cookie_len /* TCA_ACT_COOKIE */ + + nla_total_size(0) /* TCA_ACT_STATS nested */ + /* TCA_STATS_BASIC */ + + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) + /* TCA_STATS_QUEUE */ + + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) + + nla_total_size(0) /* TCA_OPTIONS nested */ + + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ +} + +static size_t tcf_action_full_attrs_size(size_t sz) +{ + return NLMSG_HDRLEN /* struct nlmsghdr */ + + sizeof(struct tcamsg) + + nla_total_size(0) /* TCA_ACT_TAB nested */ + + sz; +} + +static size_t tcf_action_fill_size(const struct tc_action *act) +{ + size_t sz = tcf_action_shared_attrs_size(act); + + if (act->ops->get_fill_size) + return act->ops->get_fill_size(act) + sz; + return sz; +} + +static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, + struct netlink_callback *cb) +{ + int err = 0, index = -1, s_i = 0, n_i = 0; + u32 act_flags = cb->args[2]; + unsigned long jiffy_since = cb->args[3]; + struct nlattr *nest; + struct idr *idr = &idrinfo->action_idr; + struct tc_action *p; + unsigned long id = 1; + + spin_lock(&idrinfo->lock); + + s_i = cb->args[0]; + + idr_for_each_entry_ul(idr, p, id) { + index++; + if (index < s_i) + continue; + + if (jiffy_since && + time_after(jiffy_since, + (unsigned long)p->tcfa_tm.lastuse)) + continue; + + nest = nla_nest_start(skb, n_i); + if (!nest) { + index--; + goto nla_put_failure; + } + err = tcf_action_dump_1(skb, p, 0, 0); + if (err < 0) { + index--; + nlmsg_trim(skb, nest); + goto done; + } + nla_nest_end(skb, nest); + n_i++; + if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) && + n_i >= TCA_ACT_MAX_PRIO) + goto done; + } +done: + if (index >= 0) + cb->args[0] = index + 1; + + spin_unlock(&idrinfo->lock); + if (n_i) { + if (act_flags & TCA_FLAG_LARGE_DUMP_ON) + cb->args[1] = n_i; + } + return n_i; + +nla_put_failure: + nla_nest_cancel(skb, nest); + goto done; +} + +static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, + const struct tc_action_ops *ops) +{ + struct nlattr *nest; + int n_i = 0; + int ret = -EINVAL; + struct idr *idr = &idrinfo->action_idr; + struct tc_action *p; + unsigned long id = 1; + + nest = nla_nest_start(skb, 0); + if (nest == NULL) + goto nla_put_failure; + if (nla_put_string(skb, TCA_KIND, ops->kind)) + goto nla_put_failure; + + idr_for_each_entry_ul(idr, p, id) { + ret = __tcf_idr_release(p, false, true); + if (ret == ACT_P_DELETED) { + module_put(ops->owner); + n_i++; + } else if (ret < 0) { + goto nla_put_failure; + } + } + if (nla_put_u32(skb, TCA_FCNT, n_i)) + goto nla_put_failure; + nla_nest_end(skb, nest); + + return n_i; +nla_put_failure: + nla_nest_cancel(skb, nest); + return ret; +} + +int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, + struct netlink_callback *cb, int type, + const struct tc_action_ops *ops, + struct netlink_ext_ack *extack) +{ + struct tcf_idrinfo *idrinfo = tn->idrinfo; + + if (type == RTM_DELACTION) { + return tcf_del_walker(idrinfo, skb, ops); + } else if (type == RTM_GETACTION) { + return tcf_dump_walker(idrinfo, skb, cb); + } else { + WARN(1, "tcf_generic_walker: unknown command %d\n", type); + NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); + return -EINVAL; + } +} +EXPORT_SYMBOL(tcf_generic_walker); + +int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) +{ + struct tcf_idrinfo *idrinfo = tn->idrinfo; + struct tc_action *p; + + spin_lock(&idrinfo->lock); + p = idr_find(&idrinfo->action_idr, index); + if (IS_ERR(p)) + p = NULL; + else if (p) + refcount_inc(&p->tcfa_refcnt); + spin_unlock(&idrinfo->lock); + + if (p) { + *a = p; + return true; + } + return false; +} +EXPORT_SYMBOL(tcf_idr_search); + +static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) +{ + struct tc_action *p; + int ret = 0; + + spin_lock(&idrinfo->lock); + p = idr_find(&idrinfo->action_idr, index); + if (!p) { + spin_unlock(&idrinfo->lock); + return -ENOENT; + } + + if (!atomic_read(&p->tcfa_bindcnt)) { + if (refcount_dec_and_test(&p->tcfa_refcnt)) { + struct module *owner = p->ops->owner; + + WARN_ON(p != idr_remove(&idrinfo->action_idr, + p->tcfa_index)); + spin_unlock(&idrinfo->lock); + + tcf_action_cleanup(p); + module_put(owner); + return 0; + } + ret = 0; + } else { + ret = -EPERM; + } + + spin_unlock(&idrinfo->lock); + return ret; +} + +int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, + struct tc_action **a, const struct tc_action_ops *ops, + int bind, bool cpustats) +{ + struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); + struct tcf_idrinfo *idrinfo = tn->idrinfo; + int err = -ENOMEM; + + if (unlikely(!p)) + return -ENOMEM; + refcount_set(&p->tcfa_refcnt, 1); + if (bind) + atomic_set(&p->tcfa_bindcnt, 1); + + if (cpustats) { + p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); + if (!p->cpu_bstats) + goto err1; + p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); + if (!p->cpu_qstats) + goto err2; + } + spin_lock_init(&p->tcfa_lock); + p->tcfa_index = index; + p->tcfa_tm.install = jiffies; + p->tcfa_tm.lastuse = jiffies; + p->tcfa_tm.firstuse = 0; + if (est) { + err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, + &p->tcfa_rate_est, + &p->tcfa_lock, NULL, est); + if (err) + goto err3; + } + + p->idrinfo = idrinfo; + p->ops = ops; + *a = p; + return 0; +err3: + free_percpu(p->cpu_qstats); +err2: + free_percpu(p->cpu_bstats); +err1: + kfree(p); + return err; +} +EXPORT_SYMBOL(tcf_idr_create); + +void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a) +{ + struct tcf_idrinfo *idrinfo = tn->idrinfo; + + spin_lock(&idrinfo->lock); + /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ + WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index))); + spin_unlock(&idrinfo->lock); +} +EXPORT_SYMBOL(tcf_idr_insert); + +/* Cleanup idr index that was allocated but not initialized. */ + +void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) +{ + struct tcf_idrinfo *idrinfo = tn->idrinfo; + + spin_lock(&idrinfo->lock); + /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ + WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); + spin_unlock(&idrinfo->lock); +} +EXPORT_SYMBOL(tcf_idr_cleanup); + +/* Check if action with specified index exists. If actions is found, increments + * its reference and bind counters, and return 1. Otherwise insert temporary + * error pointer (to prevent concurrent users from inserting actions with same + * index) and return 0. + */ + +int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, + struct tc_action **a, int bind) +{ + struct tcf_idrinfo *idrinfo = tn->idrinfo; + struct tc_action *p; + int ret; + +again: + spin_lock(&idrinfo->lock); + if (*index) { + p = idr_find(&idrinfo->action_idr, *index); + if (IS_ERR(p)) { + /* This means that another process allocated + * index but did not assign the pointer yet. + */ + spin_unlock(&idrinfo->lock); + goto again; + } + + if (p) { + refcount_inc(&p->tcfa_refcnt); + if (bind) + atomic_inc(&p->tcfa_bindcnt); + *a = p; + ret = 1; + } else { + *a = NULL; + ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, + *index, GFP_ATOMIC); + if (!ret) + idr_replace(&idrinfo->action_idr, + ERR_PTR(-EBUSY), *index); + } + } else { + *index = 1; + *a = NULL; + ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, + UINT_MAX, GFP_ATOMIC); + if (!ret) + idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY), + *index); + } + spin_unlock(&idrinfo->lock); + return ret; +} +EXPORT_SYMBOL(tcf_idr_check_alloc); + +void tcf_idrinfo_destroy(const struct tc_action_ops *ops, + struct tcf_idrinfo *idrinfo) +{ + struct idr *idr = &idrinfo->action_idr; + struct tc_action *p; + int ret; + unsigned long id = 1; + + idr_for_each_entry_ul(idr, p, id) { + ret = __tcf_idr_release(p, false, true); + if (ret == ACT_P_DELETED) + module_put(ops->owner); + else if (ret < 0) + return; + } + idr_destroy(&idrinfo->action_idr); +} +EXPORT_SYMBOL(tcf_idrinfo_destroy); + +static LIST_HEAD(act_base); +static DEFINE_RWLOCK(act_mod_lock); + +int tcf_register_action(struct tc_action_ops *act, + struct pernet_operations *ops) +{ + struct tc_action_ops *a; + int ret; + + if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) + return -EINVAL; + + /* We have to register pernet ops before making the action ops visible, + * otherwise tcf_action_init_1() could get a partially initialized + * netns. + */ + ret = register_pernet_subsys(ops); + if (ret) + return ret; + + write_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { + write_unlock(&act_mod_lock); + unregister_pernet_subsys(ops); + return -EEXIST; + } + } + list_add_tail(&act->head, &act_base); + write_unlock(&act_mod_lock); + + return 0; +} +EXPORT_SYMBOL(tcf_register_action); + +int tcf_unregister_action(struct tc_action_ops *act, + struct pernet_operations *ops) +{ + struct tc_action_ops *a; + int err = -ENOENT; + + write_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (a == act) { + list_del(&act->head); + err = 0; + break; + } + } + write_unlock(&act_mod_lock); + if (!err) + unregister_pernet_subsys(ops); + return err; +} +EXPORT_SYMBOL(tcf_unregister_action); + +/* lookup by name */ +static struct tc_action_ops *tc_lookup_action_n(char *kind) +{ + struct tc_action_ops *a, *res = NULL; + + if (kind) { + read_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (strcmp(kind, a->kind) == 0) { + if (try_module_get(a->owner)) + res = a; + break; + } + } + read_unlock(&act_mod_lock); + } + return res; +} + +/* lookup by nlattr */ +static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) +{ + struct tc_action_ops *a, *res = NULL; + + if (kind) { + read_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (nla_strcmp(kind, a->kind) == 0) { + if (try_module_get(a->owner)) + res = a; + break; + } + } + read_unlock(&act_mod_lock); + } + return res; +} + +/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */ +#define TCA_ACT_MAX_PRIO_MASK 0x1FF +int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, + int nr_actions, struct tcf_result *res) +{ + u32 jmp_prgcnt = 0; + u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ + int i; + int ret = TC_ACT_OK; + + if (skb_skip_tc_classify(skb)) + return TC_ACT_OK; + +restart_act_graph: + for (i = 0; i < nr_actions; i++) { + const struct tc_action *a = actions[i]; + int repeat_ttl; + + if (jmp_prgcnt > 0) { + jmp_prgcnt -= 1; + continue; + } + + repeat_ttl = 32; +repeat: + ret = a->ops->act(skb, a, res); + + if (unlikely(ret == TC_ACT_REPEAT)) { + if (--repeat_ttl != 0) + goto repeat; + /* suspicious opcode, stop pipeline */ + net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n"); + return TC_ACT_OK; + } + + if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { + jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; + if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { + /* faulty opcode, stop pipeline */ + return TC_ACT_OK; + } else { + jmp_ttl -= 1; + if (jmp_ttl > 0) + goto restart_act_graph; + else /* faulty graph, stop pipeline */ + return TC_ACT_OK; + } + } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { + tcf_action_goto_chain_exec(a, res); + } + + if (ret != TC_ACT_PIPE) + break; + } + + return ret; +} +EXPORT_SYMBOL(tcf_action_exec); + +int tcf_action_destroy(struct tc_action *actions[], int bind) +{ + const struct tc_action_ops *ops; + struct tc_action *a; + int ret = 0, i; + + for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { + a = actions[i]; + actions[i] = NULL; + ops = a->ops; + ret = __tcf_idr_release(a, bind, true); + if (ret == ACT_P_DELETED) + module_put(ops->owner); + else if (ret < 0) + return ret; + } + return ret; +} + +static int tcf_action_destroy_1(struct tc_action *a, int bind) +{ + struct tc_action *actions[] = { a, NULL }; + + return tcf_action_destroy(actions, bind); +} + +static int tcf_action_put(struct tc_action *p) +{ + return __tcf_action_put(p, false); +} + +/* Put all actions in this array, skip those NULL's. */ +static void tcf_action_put_many(struct tc_action *actions[]) +{ + int i; + + for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { + struct tc_action *a = actions[i]; + const struct tc_action_ops *ops; + + if (!a) + continue; + ops = a->ops; + if (tcf_action_put(a)) + module_put(ops->owner); + } +} + +int +tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) +{ + return a->ops->dump(skb, a, bind, ref); +} + +int +tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) +{ + int err = -EINVAL; + unsigned char *b = skb_tail_pointer(skb); + struct nlattr *nest; + struct tc_cookie *cookie; + + if (nla_put_string(skb, TCA_KIND, a->ops->kind)) + goto nla_put_failure; + if (tcf_action_copy_stats(skb, a, 0)) + goto nla_put_failure; + + rcu_read_lock(); + cookie = rcu_dereference(a->act_cookie); + if (cookie) { + if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { + rcu_read_unlock(); + goto nla_put_failure; + } + } + rcu_read_unlock(); + + nest = nla_nest_start(skb, TCA_OPTIONS); + if (nest == NULL) + goto nla_put_failure; + err = tcf_action_dump_old(skb, a, bind, ref); + if (err > 0) { + nla_nest_end(skb, nest); + return err; + } + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} +EXPORT_SYMBOL(tcf_action_dump_1); + +int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], + int bind, int ref) +{ + struct tc_action *a; + int err = -EINVAL, i; + struct nlattr *nest; + + for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { + a = actions[i]; + nest = nla_nest_start(skb, i + 1); + if (nest == NULL) + goto nla_put_failure; + err = tcf_action_dump_1(skb, a, bind, ref); + if (err < 0) + goto errout; + nla_nest_end(skb, nest); + } + + return 0; + +nla_put_failure: + err = -EINVAL; +errout: + nla_nest_cancel(skb, nest); + return err; +} + +static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) +{ + struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); + if (!c) + return NULL; + + c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); + if (!c->data) { + kfree(c); + return NULL; + } + c->len = nla_len(tb[TCA_ACT_COOKIE]); + + return c; +} + +static bool tcf_action_valid(int action) +{ + int opcode = TC_ACT_EXT_OPCODE(action); + + if (!opcode) + return action <= TC_ACT_VALUE_MAX; + return opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC; +} + +struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, + struct nlattr *nla, struct nlattr *est, + char *name, int ovr, int bind, + bool rtnl_held, + struct netlink_ext_ack *extack) +{ + struct tc_action *a; + struct tc_action_ops *a_o; + struct tc_cookie *cookie = NULL; + char act_name[IFNAMSIZ]; + struct nlattr *tb[TCA_ACT_MAX + 1]; + struct nlattr *kind; + int err; + + if (name == NULL) { + err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); + if (err < 0) + goto err_out; + err = -EINVAL; + kind = tb[TCA_ACT_KIND]; + if (!kind) { + NL_SET_ERR_MSG(extack, "TC action kind must be specified"); + goto err_out; + } + if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) { + NL_SET_ERR_MSG(extack, "TC action name too long"); + goto err_out; + } + if (tb[TCA_ACT_COOKIE]) { + int cklen = nla_len(tb[TCA_ACT_COOKIE]); + + if (cklen > TC_COOKIE_MAX_SIZE) { + NL_SET_ERR_MSG(extack, "TC cookie size above the maximum"); + goto err_out; + } + + cookie = nla_memdup_cookie(tb); + if (!cookie) { + NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); + err = -ENOMEM; + goto err_out; + } + } + } else { + if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) { + NL_SET_ERR_MSG(extack, "TC action name too long"); + err = -EINVAL; + goto err_out; + } + } + + a_o = tc_lookup_action_n(act_name); + if (a_o == NULL) { +#ifdef CONFIG_MODULES + if (rtnl_held) + rtnl_unlock(); + request_module("act_%s", act_name); + if (rtnl_held) + rtnl_lock(); + + a_o = tc_lookup_action_n(act_name); + + /* We dropped the RTNL semaphore in order to + * perform the module load. So, even if we + * succeeded in loading the module we have to + * tell the caller to replay the request. We + * indicate this using -EAGAIN. + */ + if (a_o != NULL) { + err = -EAGAIN; + goto err_mod; + } +#endif + NL_SET_ERR_MSG(extack, "Failed to load TC action module"); + err = -ENOENT; + goto err_out; + } + + /* backward compatibility for policer */ + if (name == NULL) + err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind, + rtnl_held, extack); + else + err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held, + extack); + if (err < 0) + goto err_mod; + + if (!name && tb[TCA_ACT_COOKIE]) + tcf_set_action_cookie(&a->act_cookie, cookie); + + /* module count goes up only when brand new policy is created + * if it exists and is only bound to in a_o->init() then + * ACT_P_CREATED is not returned (a zero is). + */ + if (err != ACT_P_CREATED) + module_put(a_o->owner); + + if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) { + err = tcf_action_goto_chain_init(a, tp); + if (err) { + tcf_action_destroy_1(a, bind); + NL_SET_ERR_MSG(extack, "Failed to init TC action chain"); + return ERR_PTR(err); + } + } + + if (!tcf_action_valid(a->tcfa_action)) { + tcf_action_destroy_1(a, bind); + NL_SET_ERR_MSG(extack, "Invalid control action value"); + return ERR_PTR(-EINVAL); + } + + if (!bind && ovr && err == ACT_P_CREATED) + refcount_set(&a->tcfa_refcnt, 2); + + return a; + +err_mod: + module_put(a_o->owner); +err_out: + if (cookie) { + kfree(cookie->data); + kfree(cookie); + } + return ERR_PTR(err); +} + +/* Returns numbers of initialized actions or negative error. */ + +int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, + struct nlattr *est, char *name, int ovr, int bind, + struct tc_action *actions[], size_t *attr_size, + bool rtnl_held, struct netlink_ext_ack *extack) +{ + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct tc_action *act; + size_t sz = 0; + int err; + int i; + + err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack); + if (err < 0) + return err; + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind, + rtnl_held, extack); + if (IS_ERR(act)) { + err = PTR_ERR(act); + goto err; + } + act->order = i; + sz += tcf_action_fill_size(act); + /* Start from index 0 */ + actions[i - 1] = act; + } + + *attr_size = tcf_action_full_attrs_size(sz); + return i - 1; + +err: + tcf_action_destroy(actions, bind); + return err; +} + +int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, + int compat_mode) +{ + int err = 0; + struct gnet_dump d; + + if (p == NULL) + goto errout; + + /* compat_mode being true specifies a call that is supposed + * to add additional backward compatibility statistic TLVs. + */ + if (compat_mode) { + if (p->type == TCA_OLD_COMPAT) + err = gnet_stats_start_copy_compat(skb, 0, + TCA_STATS, + TCA_XSTATS, + &p->tcfa_lock, &d, + TCA_PAD); + else + return 0; + } else + err = gnet_stats_start_copy(skb, TCA_ACT_STATS, + &p->tcfa_lock, &d, TCA_ACT_PAD); + + if (err < 0) + goto errout; + + if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 || + gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || + gnet_stats_copy_queue(&d, p->cpu_qstats, + &p->tcfa_qstats, + p->tcfa_qstats.qlen) < 0) + goto errout; + + if (gnet_stats_finish_copy(&d) < 0) + goto errout; + + return 0; + +errout: + return -1; +} + +static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], + u32 portid, u32 seq, u16 flags, int event, int bind, + int ref) +{ + struct tcamsg *t; + struct nlmsghdr *nlh; + unsigned char *b = skb_tail_pointer(skb); + struct nlattr *nest; + + nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); + if (!nlh) + goto out_nlmsg_trim; + t = nlmsg_data(nlh); + t->tca_family = AF_UNSPEC; + t->tca__pad1 = 0; + t->tca__pad2 = 0; + + nest = nla_nest_start(skb, TCA_ACT_TAB); + if (!nest) + goto out_nlmsg_trim; + + if (tcf_action_dump(skb, actions, bind, ref) < 0) + goto out_nlmsg_trim; + + nla_nest_end(skb, nest); + + nlh->nlmsg_len = skb_tail_pointer(skb) - b; + return skb->len; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -1; +} + +static int +tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, + struct tc_action *actions[], int event, + struct netlink_ext_ack *extack) +{ + struct sk_buff *skb; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, + 0, 1) <= 0) { + NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); + kfree_skb(skb); + return -EINVAL; + } + + return rtnl_unicast(skb, net, portid); +} + +static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, + struct nlmsghdr *n, u32 portid, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[TCA_ACT_MAX + 1]; + const struct tc_action_ops *ops; + struct tc_action *a; + int index; + int err; + + err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); + if (err < 0) + goto err_out; + + err = -EINVAL; + if (tb[TCA_ACT_INDEX] == NULL || + nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { + NL_SET_ERR_MSG(extack, "Invalid TC action index value"); + goto err_out; + } + index = nla_get_u32(tb[TCA_ACT_INDEX]); + + err = -EINVAL; + ops = tc_lookup_action(tb[TCA_ACT_KIND]); + if (!ops) { /* could happen in batch of actions */ + NL_SET_ERR_MSG(extack, "Specified TC action not found"); + goto err_out; + } + err = -ENOENT; + if (ops->lookup(net, &a, index, extack) == 0) + goto err_mod; + + module_put(ops->owner); + return a; + +err_mod: + module_put(ops->owner); +err_out: + return ERR_PTR(err); +} + +static int tca_action_flush(struct net *net, struct nlattr *nla, + struct nlmsghdr *n, u32 portid, + struct netlink_ext_ack *extack) +{ + struct sk_buff *skb; + unsigned char *b; + struct nlmsghdr *nlh; + struct tcamsg *t; + struct netlink_callback dcb; + struct nlattr *nest; + struct nlattr *tb[TCA_ACT_MAX + 1]; + const struct tc_action_ops *ops; + struct nlattr *kind; + int err = -ENOMEM; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return err; + + b = skb_tail_pointer(skb); + + err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); + if (err < 0) + goto err_out; + + err = -EINVAL; + kind = tb[TCA_ACT_KIND]; + ops = tc_lookup_action(kind); + if (!ops) { /*some idjot trying to flush unknown action */ + NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); + goto err_out; + } + + nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, + sizeof(*t), 0); + if (!nlh) { + NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); + goto out_module_put; + } + t = nlmsg_data(nlh); + t->tca_family = AF_UNSPEC; + t->tca__pad1 = 0; + t->tca__pad2 = 0; + + nest = nla_nest_start(skb, TCA_ACT_TAB); + if (!nest) { + NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); + goto out_module_put; + } + + err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack); + if (err <= 0) { + nla_nest_cancel(skb, nest); + goto out_module_put; + } + + nla_nest_end(skb, nest); + + nlh->nlmsg_len = skb_tail_pointer(skb) - b; + nlh->nlmsg_flags |= NLM_F_ROOT; + module_put(ops->owner); + err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + if (err > 0) + return 0; + if (err < 0) + NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); + + return err; + +out_module_put: + module_put(ops->owner); +err_out: + kfree_skb(skb); + return err; +} + +static int tcf_action_delete(struct net *net, struct tc_action *actions[]) +{ + int i; + + for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { + struct tc_action *a = actions[i]; + const struct tc_action_ops *ops = a->ops; + /* Actions can be deleted concurrently so we must save their + * type and id to search again after reference is released. + */ + struct tcf_idrinfo *idrinfo = a->idrinfo; + u32 act_index = a->tcfa_index; + + actions[i] = NULL; + if (tcf_action_put(a)) { + /* last reference, action was deleted concurrently */ + module_put(ops->owner); + } else { + int ret; + + /* now do the delete */ + ret = tcf_idr_delete_index(idrinfo, act_index); + if (ret < 0) + return ret; + } + } + return 0; +} + +static int +tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], + u32 portid, size_t attr_size, struct netlink_ext_ack *extack) +{ + int ret; + struct sk_buff *skb; + + skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, + GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, + 0, 2) <= 0) { + NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); + kfree_skb(skb); + return -EINVAL; + } + + /* now do the delete */ + ret = tcf_action_delete(net, actions); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Failed to delete TC action"); + kfree_skb(skb); + return ret; + } + + ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + if (ret > 0) + return 0; + return ret; +} + +static int +tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, + u32 portid, int event, struct netlink_ext_ack *extack) +{ + int i, ret; + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct tc_action *act; + size_t attr_size = 0; + struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; + + ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack); + if (ret < 0) + return ret; + + if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { + if (tb[1]) + return tca_action_flush(net, tb[1], n, portid, extack); + + NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); + return -EINVAL; + } + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + act = tcf_action_get_1(net, tb[i], n, portid, extack); + if (IS_ERR(act)) { + ret = PTR_ERR(act); + goto err; + } + attr_size += tcf_action_fill_size(act); + actions[i - 1] = act; + } + + attr_size = tcf_action_full_attrs_size(attr_size); + + if (event == RTM_GETACTION) + ret = tcf_get_notify(net, portid, n, actions, event, extack); + else { /* delete */ + ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); + if (ret) + goto err; + return 0; + } +err: + tcf_action_put_many(actions); + return ret; +} + +static int +tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], + u32 portid, size_t attr_size, struct netlink_ext_ack *extack) +{ + struct sk_buff *skb; + int err = 0; + + skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, + GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, + RTM_NEWACTION, 0, 0) <= 0) { + NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); + kfree_skb(skb); + return -EINVAL; + } + + err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + if (err > 0) + err = 0; + return err; +} + +static int tcf_action_add(struct net *net, struct nlattr *nla, + struct nlmsghdr *n, u32 portid, int ovr, + struct netlink_ext_ack *extack) +{ + size_t attr_size = 0; + int loop, ret; + struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; + + for (loop = 0; loop < 10; loop++) { + ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, + actions, &attr_size, true, extack); + if (ret != -EAGAIN) + break; + } + + if (ret < 0) + return ret; + ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); + if (ovr) + tcf_action_put_many(actions); + + return ret; +} + +static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON; +static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { + [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32, + .validation_data = &tcaa_root_flags_allowed }, + [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, +}; + +static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct nlattr *tca[TCA_ROOT_MAX + 1]; + u32 portid = skb ? NETLINK_CB(skb).portid : 0; + int ret = 0, ovr = 0; + + if ((n->nlmsg_type != RTM_GETACTION) && + !netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL, + extack); + if (ret < 0) + return ret; + + if (tca[TCA_ACT_TAB] == NULL) { + NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); + return -EINVAL; + } + + /* n->nlmsg_flags & NLM_F_CREATE */ + switch (n->nlmsg_type) { + case RTM_NEWACTION: + /* we are going to assume all other flags + * imply create only if it doesn't exist + * Note that CREATE | EXCL implies that + * but since we want avoid ambiguity (eg when flags + * is zero) then just set this + */ + if (n->nlmsg_flags & NLM_F_REPLACE) + ovr = 1; + ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr, + extack); + break; + case RTM_DELACTION: + ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, + portid, RTM_DELACTION, extack); + break; + case RTM_GETACTION: + ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, + portid, RTM_GETACTION, extack); + break; + default: + BUG(); + } + + return ret; +} + +static struct nlattr *find_dump_kind(struct nlattr **nla) +{ + struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct nlattr *kind; + + tb1 = nla[TCA_ACT_TAB]; + if (tb1 == NULL) + return NULL; + + if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), + NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) + return NULL; + + if (tb[1] == NULL) + return NULL; + if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0) + return NULL; + kind = tb2[TCA_ACT_KIND]; + + return kind; +} + +static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + struct nlmsghdr *nlh; + unsigned char *b = skb_tail_pointer(skb); + struct nlattr *nest; + struct tc_action_ops *a_o; + int ret = 0; + struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); + struct nlattr *tb[TCA_ROOT_MAX + 1]; + struct nlattr *count_attr = NULL; + unsigned long jiffy_since = 0; + struct nlattr *kind = NULL; + struct nla_bitfield32 bf; + u32 msecs_since = 0; + u32 act_count = 0; + + ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX, + tcaa_policy, NULL); + if (ret < 0) + return ret; + + kind = find_dump_kind(tb); + if (kind == NULL) { + pr_info("tc_dump_action: action bad kind\n"); + return 0; + } + + a_o = tc_lookup_action(kind); + if (a_o == NULL) + return 0; + + cb->args[2] = 0; + if (tb[TCA_ROOT_FLAGS]) { + bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); + cb->args[2] = bf.value; + } + + if (tb[TCA_ROOT_TIME_DELTA]) { + msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); + } + + nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, + cb->nlh->nlmsg_type, sizeof(*t), 0); + if (!nlh) + goto out_module_put; + + if (msecs_since) + jiffy_since = jiffies - msecs_to_jiffies(msecs_since); + + t = nlmsg_data(nlh); + t->tca_family = AF_UNSPEC; + t->tca__pad1 = 0; + t->tca__pad2 = 0; + cb->args[3] = jiffy_since; + count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); + if (!count_attr) + goto out_module_put; + + nest = nla_nest_start(skb, TCA_ACT_TAB); + if (nest == NULL) + goto out_module_put; + + ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL); + if (ret < 0) + goto out_module_put; + + if (ret > 0) { + nla_nest_end(skb, nest); + ret = skb->len; + act_count = cb->args[1]; + memcpy(nla_data(count_attr), &act_count, sizeof(u32)); + cb->args[1] = 0; + } else + nlmsg_trim(skb, b); + + nlh->nlmsg_len = skb_tail_pointer(skb) - b; + if (NETLINK_CB(cb->skb).portid && ret) + nlh->nlmsg_flags |= NLM_F_MULTI; + module_put(a_o->owner); + return skb->len; + +out_module_put: + module_put(a_o->owner); + nlmsg_trim(skb, b); + return skb->len; +} + +struct tcf_action_net { + struct rhashtable egdev_ht; +}; + +static unsigned int tcf_action_net_id; + +struct tcf_action_egdev_cb { + struct list_head list; + tc_setup_cb_t *cb; + void *cb_priv; +}; + +struct tcf_action_egdev { + struct rhash_head ht_node; + const struct net_device *dev; + unsigned int refcnt; + struct list_head cb_list; +}; + +static const struct rhashtable_params tcf_action_egdev_ht_params = { + .key_offset = offsetof(struct tcf_action_egdev, dev), + .head_offset = offsetof(struct tcf_action_egdev, ht_node), + .key_len = sizeof(const struct net_device *), +}; + +static struct tcf_action_egdev * +tcf_action_egdev_lookup(const struct net_device *dev) +{ + struct net *net = dev_net(dev); + struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); + + return rhashtable_lookup_fast(&tan->egdev_ht, &dev, + tcf_action_egdev_ht_params); +} + +static struct tcf_action_egdev * +tcf_action_egdev_get(const struct net_device *dev) +{ + struct tcf_action_egdev *egdev; + struct tcf_action_net *tan; + + egdev = tcf_action_egdev_lookup(dev); + if (egdev) + goto inc_ref; + + egdev = kzalloc(sizeof(*egdev), GFP_KERNEL); + if (!egdev) + return NULL; + INIT_LIST_HEAD(&egdev->cb_list); + egdev->dev = dev; + tan = net_generic(dev_net(dev), tcf_action_net_id); + rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node, + tcf_action_egdev_ht_params); + +inc_ref: + egdev->refcnt++; + return egdev; +} + +static void tcf_action_egdev_put(struct tcf_action_egdev *egdev) +{ + struct tcf_action_net *tan; + + if (--egdev->refcnt) + return; + tan = net_generic(dev_net(egdev->dev), tcf_action_net_id); + rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node, + tcf_action_egdev_ht_params); + kfree(egdev); +} + +static struct tcf_action_egdev_cb * +tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev, + tc_setup_cb_t *cb, void *cb_priv) +{ + struct tcf_action_egdev_cb *egdev_cb; + + list_for_each_entry(egdev_cb, &egdev->cb_list, list) + if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv) + return egdev_cb; + return NULL; +} + +static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev, + enum tc_setup_type type, + void *type_data, bool err_stop) +{ + struct tcf_action_egdev_cb *egdev_cb; + int ok_count = 0; + int err; + + list_for_each_entry(egdev_cb, &egdev->cb_list, list) { + err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv); + if (err) { + if (err_stop) + return err; + } else { + ok_count++; + } + } + return ok_count; +} + +static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev, + tc_setup_cb_t *cb, void *cb_priv) +{ + struct tcf_action_egdev_cb *egdev_cb; + + egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv); + if (WARN_ON(egdev_cb)) + return -EEXIST; + egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL); + if (!egdev_cb) + return -ENOMEM; + egdev_cb->cb = cb; + egdev_cb->cb_priv = cb_priv; + list_add(&egdev_cb->list, &egdev->cb_list); + return 0; +} + +static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev, + tc_setup_cb_t *cb, void *cb_priv) +{ + struct tcf_action_egdev_cb *egdev_cb; + + egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv); + if (WARN_ON(!egdev_cb)) + return; + list_del(&egdev_cb->list); + kfree(egdev_cb); +} + +static int __tc_setup_cb_egdev_register(const struct net_device *dev, + tc_setup_cb_t *cb, void *cb_priv) +{ + struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev); + int err; + + if (!egdev) + return -ENOMEM; + err = tcf_action_egdev_cb_add(egdev, cb, cb_priv); + if (err) + goto err_cb_add; + return 0; + +err_cb_add: + tcf_action_egdev_put(egdev); + return err; +} +int tc_setup_cb_egdev_register(const struct net_device *dev, + tc_setup_cb_t *cb, void *cb_priv) +{ + int err; + + rtnl_lock(); + err = __tc_setup_cb_egdev_register(dev, cb, cb_priv); + rtnl_unlock(); + return err; +} +EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register); + +static void __tc_setup_cb_egdev_unregister(const struct net_device *dev, + tc_setup_cb_t *cb, void *cb_priv) +{ + struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev); + + if (WARN_ON(!egdev)) + return; + tcf_action_egdev_cb_del(egdev, cb, cb_priv); + tcf_action_egdev_put(egdev); +} +void tc_setup_cb_egdev_unregister(const struct net_device *dev, + tc_setup_cb_t *cb, void *cb_priv) +{ + rtnl_lock(); + __tc_setup_cb_egdev_unregister(dev, cb, cb_priv); + rtnl_unlock(); +} +EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister); + +int tc_setup_cb_egdev_call(const struct net_device *dev, + enum tc_setup_type type, void *type_data, + bool err_stop) +{ + struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev); + + if (!egdev) + return 0; + return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop); +} +EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call); + +static __net_init int tcf_action_net_init(struct net *net) +{ + struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); + + return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params); +} + +static void __net_exit tcf_action_net_exit(struct net *net) +{ + struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); + + rhashtable_destroy(&tan->egdev_ht); +} + +static struct pernet_operations tcf_action_net_ops = { + .init = tcf_action_net_init, + .exit = tcf_action_net_exit, + .id = &tcf_action_net_id, + .size = sizeof(struct tcf_action_net), +}; + +static int __init tc_action_init(void) +{ + int err; + + err = register_pernet_subsys(&tcf_action_net_ops); + if (err) + return err; + + rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); + rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); + rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, + 0); + + return 0; +} + +subsys_initcall(tc_action_init); |