diff options
Diffstat (limited to 'net/sched/act_api.c')
| -rw-r--r-- | net/sched/act_api.c | 2189 |
1 files changed, 2189 insertions, 0 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c new file mode 100644 index 000000000..b33f88e50 --- /dev/null +++ b/net/sched/act_api.c @@ -0,0 +1,2189 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/act_api.c Packet action API. + * + * 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 <net/net_namespace.h> +#include <net/sock.h> +#include <net/sch_generic.h> +#include <net/pkt_cls.h> +#include <net/tc_act/tc_pedit.h> +#include <net/act_api.h> +#include <net/netlink.h> +#include <net/flow_offload.h> + +#ifdef CONFIG_INET +DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count); +EXPORT_SYMBOL_GPL(tcf_frag_xmit_count); +#endif + +int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)) +{ +#ifdef CONFIG_INET + if (static_branch_unlikely(&tcf_frag_xmit_count)) + return sch_frag_xmit_hook(skb, xmit); +#endif + + return xmit(skb); +} +EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit); + +static void tcf_action_goto_chain_exec(const struct tc_action *a, + struct tcf_result *res) +{ + const struct tcf_chain *chain = rcu_dereference_bh(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); +} + +int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, + struct tcf_chain **newchain, + struct netlink_ext_ack *extack) +{ + int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL; + u32 chain_index; + + if (!opcode) + ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0; + else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC) + ret = 0; + if (ret) { + NL_SET_ERR_MSG(extack, "invalid control action"); + goto end; + } + + if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) { + chain_index = action & TC_ACT_EXT_VAL_MASK; + if (!tp || !newchain) { + ret = -EINVAL; + NL_SET_ERR_MSG(extack, + "can't goto NULL proto/chain"); + goto end; + } + *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index); + if (!*newchain) { + ret = -ENOMEM; + NL_SET_ERR_MSG(extack, + "can't allocate goto_chain"); + } + } +end: + return ret; +} +EXPORT_SYMBOL(tcf_action_check_ctrlact); + +struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, + struct tcf_chain *goto_chain) +{ + a->tcfa_action = action; + goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1); + return goto_chain; +} +EXPORT_SYMBOL(tcf_action_set_ctrlact); + +/* 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) +{ + struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1); + + free_percpu(p->cpu_bstats); + free_percpu(p->cpu_bstats_hw); + free_percpu(p->cpu_qstats); + + tcf_set_action_cookie(&p->act_cookie, NULL); + if (chain) + tcf_chain_put_by_act(chain); + + kfree(p); +} + +static void offload_action_hw_count_set(struct tc_action *act, + u32 hw_count) +{ + act->in_hw_count = hw_count; +} + +static void offload_action_hw_count_inc(struct tc_action *act, + u32 hw_count) +{ + act->in_hw_count += hw_count; +} + +static void offload_action_hw_count_dec(struct tc_action *act, + u32 hw_count) +{ + act->in_hw_count = act->in_hw_count > hw_count ? + act->in_hw_count - hw_count : 0; +} + +static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act) +{ + if (is_tcf_pedit(act)) + return tcf_pedit_nkeys(act); + else + return 1; +} + +static bool tc_act_skip_hw(u32 flags) +{ + return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false; +} + +static bool tc_act_skip_sw(u32 flags) +{ + return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false; +} + +static bool tc_act_in_hw(struct tc_action *act) +{ + return !!act->in_hw_count; +} + +/* SKIP_HW and SKIP_SW are mutually exclusive flags. */ +static bool tc_act_flags_valid(u32 flags) +{ + flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW; + + return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW); +} + +static int offload_action_init(struct flow_offload_action *fl_action, + struct tc_action *act, + enum offload_act_command cmd, + struct netlink_ext_ack *extack) +{ + int err; + + fl_action->extack = extack; + fl_action->command = cmd; + fl_action->index = act->tcfa_index; + + if (act->ops->offload_act_setup) { + spin_lock_bh(&act->tcfa_lock); + err = act->ops->offload_act_setup(act, fl_action, NULL, + false, extack); + spin_unlock_bh(&act->tcfa_lock); + return err; + } + + return -EOPNOTSUPP; +} + +static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act, + u32 *hw_count) +{ + int err; + + err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT, + fl_act, NULL, NULL); + if (err < 0) + return err; + + if (hw_count) + *hw_count = err; + + return 0; +} + +static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act, + u32 *hw_count, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) +{ + int err; + + err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL); + if (err < 0) + return err; + + if (hw_count) + *hw_count = 1; + + return 0; +} + +static int tcf_action_offload_cmd(struct flow_offload_action *fl_act, + u32 *hw_count, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) +{ + return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count, + cb, cb_priv) : + tcf_action_offload_cmd_ex(fl_act, hw_count); +} + +static int tcf_action_offload_add_ex(struct tc_action *action, + struct netlink_ext_ack *extack, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) +{ + bool skip_sw = tc_act_skip_sw(action->tcfa_flags); + struct tc_action *actions[TCA_ACT_MAX_PRIO] = { + [0] = action, + }; + struct flow_offload_action *fl_action; + u32 in_hw_count = 0; + int num, err = 0; + + if (tc_act_skip_hw(action->tcfa_flags)) + return 0; + + num = tcf_offload_act_num_actions_single(action); + fl_action = offload_action_alloc(num); + if (!fl_action) + return -ENOMEM; + + err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack); + if (err) + goto fl_err; + + err = tc_setup_action(&fl_action->action, actions, extack); + if (err) { + NL_SET_ERR_MSG_MOD(extack, + "Failed to setup tc actions for offload"); + goto fl_err; + } + + err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv); + if (!err) + cb ? offload_action_hw_count_inc(action, in_hw_count) : + offload_action_hw_count_set(action, in_hw_count); + + if (skip_sw && !tc_act_in_hw(action)) + err = -EINVAL; + + tc_cleanup_offload_action(&fl_action->action); + +fl_err: + kfree(fl_action); + + return err; +} + +/* offload the tc action after it is inserted */ +static int tcf_action_offload_add(struct tc_action *action, + struct netlink_ext_ack *extack) +{ + return tcf_action_offload_add_ex(action, extack, NULL, NULL); +} + +int tcf_action_update_hw_stats(struct tc_action *action) +{ + struct flow_offload_action fl_act = {}; + int err; + + if (!tc_act_in_hw(action)) + return -EOPNOTSUPP; + + err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL); + if (err) + return err; + + err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL); + if (!err) { + preempt_disable(); + tcf_action_stats_update(action, fl_act.stats.bytes, + fl_act.stats.pkts, + fl_act.stats.drops, + fl_act.stats.lastused, + true); + preempt_enable(); + action->used_hw_stats = fl_act.stats.used_hw_stats; + action->used_hw_stats_valid = true; + } else { + return -EOPNOTSUPP; + } + + return 0; +} +EXPORT_SYMBOL(tcf_action_update_hw_stats); + +static int tcf_action_offload_del_ex(struct tc_action *action, + flow_indr_block_bind_cb_t *cb, + void *cb_priv) +{ + struct flow_offload_action fl_act = {}; + u32 in_hw_count = 0; + int err = 0; + + if (!tc_act_in_hw(action)) + return 0; + + err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL); + if (err) + return err; + + err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv); + if (err < 0) + return err; + + if (!cb && action->in_hw_count != in_hw_count) + return -EINVAL; + + /* do not need to update hw state when deleting action */ + if (cb && in_hw_count) + offload_action_hw_count_dec(action, in_hw_count); + + return 0; +} + +static int tcf_action_offload_del(struct tc_action *action) +{ + return tcf_action_offload_del_ex(action, NULL, NULL); +} + +static void tcf_action_cleanup(struct tc_action *p) +{ + tcf_action_offload_del(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_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) { + if (bind) + atomic_dec(&p->tcfa_bindcnt); + idr_remove(&idrinfo->action_idr, p->tcfa_index); + mutex_unlock(&idrinfo->lock); + + tcf_action_cleanup(p); + return 1; + } + + if (bind) + atomic_dec(&p->tcfa_bindcnt); + + return 0; +} + +static 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; +} + +int tcf_idr_release(struct tc_action *a, bool bind) +{ + const struct tc_action_ops *ops = a->ops; + int ret; + + ret = __tcf_idr_release(a, bind, false); + if (ret == ACT_P_DELETED) + module_put(ops->owner); + 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(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ + + nla_total_size(0) /* TCA_ACT_STATS nested */ + + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */ + /* TCA_STATS_BASIC */ + + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) + /* TCA_STATS_PKT64 */ + + nla_total_size_64bit(sizeof(u64)) + /* 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_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act) +{ + unsigned char *b = skb_tail_pointer(skb); + 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; + if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index)) + 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(); + + return 0; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +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; + unsigned long tmp; + + mutex_lock(&idrinfo->lock); + + s_i = cb->args[0]; + + idr_for_each_entry_ul(idr, p, tmp, id) { + index++; + if (index < s_i) + continue; + if (IS_ERR(p)) + continue; + + if (jiffy_since && + time_after(jiffy_since, + (unsigned long)p->tcfa_tm.lastuse)) + continue; + + nest = nla_nest_start_noflag(skb, n_i); + if (!nest) { + index--; + goto nla_put_failure; + } + err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ? + tcf_action_dump_terse(skb, p, true) : + 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_ACT_FLAG_LARGE_DUMP_ON) && + n_i >= TCA_ACT_MAX_PRIO) + goto done; + } +done: + if (index >= 0) + cb->args[0] = index + 1; + + mutex_unlock(&idrinfo->lock); + if (n_i) { + if (act_flags & TCA_ACT_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_idr_release_unsafe(struct tc_action *p) +{ + if (atomic_read(&p->tcfa_bindcnt) > 0) + return -EPERM; + + if (refcount_dec_and_test(&p->tcfa_refcnt)) { + idr_remove(&p->idrinfo->action_idr, p->tcfa_index); + tcf_action_cleanup(p); + return ACT_P_DELETED; + } + + return 0; +} + +static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, + const struct tc_action_ops *ops, + struct netlink_ext_ack *extack) +{ + struct nlattr *nest; + int n_i = 0; + int ret = -EINVAL; + struct idr *idr = &idrinfo->action_idr; + struct tc_action *p; + unsigned long id = 1; + unsigned long tmp; + + nest = nla_nest_start_noflag(skb, 0); + if (nest == NULL) + goto nla_put_failure; + if (nla_put_string(skb, TCA_KIND, ops->kind)) + goto nla_put_failure; + + ret = 0; + mutex_lock(&idrinfo->lock); + idr_for_each_entry_ul(idr, p, tmp, id) { + if (IS_ERR(p)) + continue; + ret = tcf_idr_release_unsafe(p); + if (ret == ACT_P_DELETED) + module_put(ops->owner); + else if (ret < 0) + break; + n_i++; + } + mutex_unlock(&idrinfo->lock); + if (ret < 0) { + if (n_i) + NL_SET_ERR_MSG(extack, "Unable to flush all TC actions"); + else + goto nla_put_failure; + } + + ret = nla_put_u32(skb, TCA_FCNT, n_i); + if (ret) + 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, extack); + } 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; + + mutex_lock(&idrinfo->lock); + p = idr_find(&idrinfo->action_idr, index); + if (IS_ERR(p)) + p = NULL; + else if (p) + refcount_inc(&p->tcfa_refcnt); + mutex_unlock(&idrinfo->lock); + + if (p) { + *a = p; + return true; + } + return false; +} +EXPORT_SYMBOL(tcf_idr_search); + +static int __tcf_generic_walker(struct net *net, struct sk_buff *skb, + struct netlink_callback *cb, int type, + const struct tc_action_ops *ops, + struct netlink_ext_ack *extack) +{ + struct tc_action_net *tn = net_generic(net, ops->net_id); + + if (unlikely(ops->walk)) + return ops->walk(net, skb, cb, type, ops, extack); + + return tcf_generic_walker(tn, skb, cb, type, ops, extack); +} + +static int __tcf_idr_search(struct net *net, + const struct tc_action_ops *ops, + struct tc_action **a, u32 index) +{ + struct tc_action_net *tn = net_generic(net, ops->net_id); + + if (unlikely(ops->lookup)) + return ops->lookup(net, a, index); + + return tcf_idr_search(tn, a, index); +} + +static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) +{ + struct tc_action *p; + int ret = 0; + + mutex_lock(&idrinfo->lock); + p = idr_find(&idrinfo->action_idr, index); + if (!p) { + mutex_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)); + mutex_unlock(&idrinfo->lock); + + tcf_action_cleanup(p); + module_put(owner); + return 0; + } + ret = 0; + } else { + ret = -EPERM; + } + + mutex_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, u32 flags) +{ + 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_sync); + if (!p->cpu_bstats) + goto err1; + p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); + if (!p->cpu_bstats_hw) + goto err2; + p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); + if (!p->cpu_qstats) + goto err3; + } + gnet_stats_basic_sync_init(&p->tcfa_bstats); + gnet_stats_basic_sync_init(&p->tcfa_bstats_hw); + 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; + p->tcfa_flags = flags; + if (est) { + err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, + &p->tcfa_rate_est, + &p->tcfa_lock, false, est); + if (err) + goto err4; + } + + p->idrinfo = idrinfo; + __module_get(ops->owner); + p->ops = ops; + *a = p; + return 0; +err4: + free_percpu(p->cpu_qstats); +err3: + free_percpu(p->cpu_bstats_hw); +err2: + free_percpu(p->cpu_bstats); +err1: + kfree(p); + return err; +} +EXPORT_SYMBOL(tcf_idr_create); + +int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, + struct nlattr *est, struct tc_action **a, + const struct tc_action_ops *ops, int bind, + u32 flags) +{ + /* Set cpustats according to actions flags. */ + return tcf_idr_create(tn, index, est, a, ops, bind, + !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags); +} +EXPORT_SYMBOL(tcf_idr_create_from_flags); + +/* 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; + + mutex_lock(&idrinfo->lock); + /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ + WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); + mutex_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: + mutex_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. + */ + mutex_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_KERNEL); + 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_KERNEL); + if (!ret) + idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY), + *index); + } + mutex_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; + unsigned long tmp; + + idr_for_each_entry_ul(idr, p, tmp, 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); +/* since act ops id is stored in pernet subsystem list, + * then there is no way to walk through only all the action + * subsystem, so we keep tc action pernet ops id for + * reoffload to walk through. + */ +static LIST_HEAD(act_pernet_id_list); +static DEFINE_MUTEX(act_id_mutex); +struct tc_act_pernet_id { + struct list_head list; + unsigned int id; +}; + +static int tcf_pernet_add_id_list(unsigned int id) +{ + struct tc_act_pernet_id *id_ptr; + int ret = 0; + + mutex_lock(&act_id_mutex); + list_for_each_entry(id_ptr, &act_pernet_id_list, list) { + if (id_ptr->id == id) { + ret = -EEXIST; + goto err_out; + } + } + + id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL); + if (!id_ptr) { + ret = -ENOMEM; + goto err_out; + } + id_ptr->id = id; + + list_add_tail(&id_ptr->list, &act_pernet_id_list); + +err_out: + mutex_unlock(&act_id_mutex); + return ret; +} + +static void tcf_pernet_del_id_list(unsigned int id) +{ + struct tc_act_pernet_id *id_ptr; + + mutex_lock(&act_id_mutex); + list_for_each_entry(id_ptr, &act_pernet_id_list, list) { + if (id_ptr->id == id) { + list_del(&id_ptr->list); + kfree(id_ptr); + break; + } + } + mutex_unlock(&act_id_mutex); +} + +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) + 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; + + if (ops->id) { + ret = tcf_pernet_add_id_list(*ops->id); + if (ret) + goto err_id; + } + + write_lock(&act_mod_lock); + list_for_each_entry(a, &act_base, head) { + if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { + ret = -EEXIST; + goto err_out; + } + } + list_add_tail(&act->head, &act_base); + write_unlock(&act_mod_lock); + + return 0; + +err_out: + write_unlock(&act_mod_lock); + if (ops->id) + tcf_pernet_del_id_list(*ops->id); +err_id: + unregister_pernet_subsys(ops); + return ret; +} +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); + if (ops->id) + tcf_pernet_del_id_list(*ops->id); + } + 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 up to 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; + } + + if (tc_act_skip_sw(a->tcfa_flags)) + 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)) { + if (unlikely(!rcu_access_pointer(a->goto_chain))) { + net_warn_ratelimited("can't go to NULL chain!\n"); + return TC_ACT_SHOT; + } + 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_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; + u32 flags; + + if (tcf_action_dump_terse(skb, a, false)) + goto nla_put_failure; + + if (a->hw_stats != TCA_ACT_HW_STATS_ANY && + nla_put_bitfield32(skb, TCA_ACT_HW_STATS, + a->hw_stats, TCA_ACT_HW_STATS_ANY)) + goto nla_put_failure; + + if (a->used_hw_stats_valid && + nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS, + a->used_hw_stats, TCA_ACT_HW_STATS_ANY)) + goto nla_put_failure; + + flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK; + if (flags && + nla_put_bitfield32(skb, TCA_ACT_FLAGS, + flags, flags)) + goto nla_put_failure; + + if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count)) + goto nla_put_failure; + + nest = nla_nest_start_noflag(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, bool terse) +{ + 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_noflag(skb, i + 1); + if (nest == NULL) + goto nla_put_failure; + err = terse ? tcf_action_dump_terse(skb, a, false) : + 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 u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr) +{ + struct nla_bitfield32 hw_stats_bf; + + /* If the user did not pass the attr, that means he does + * not care about the type. Return "any" in that case + * which is setting on all supported types. + */ + if (!hw_stats_attr) + return TCA_ACT_HW_STATS_ANY; + hw_stats_bf = nla_get_bitfield32(hw_stats_attr); + return hw_stats_bf.value; +} + +static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { + [TCA_ACT_KIND] = { .type = NLA_STRING }, + [TCA_ACT_INDEX] = { .type = NLA_U32 }, + [TCA_ACT_COOKIE] = { .type = NLA_BINARY, + .len = TC_COOKIE_MAX_SIZE }, + [TCA_ACT_OPTIONS] = { .type = NLA_NESTED }, + [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS | + TCA_ACT_FLAGS_SKIP_HW | + TCA_ACT_FLAGS_SKIP_SW), + [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), +}; + +void tcf_idr_insert_many(struct tc_action *actions[]) +{ + int i; + + for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { + struct tc_action *a = actions[i]; + struct tcf_idrinfo *idrinfo; + + if (!a) + continue; + idrinfo = a->idrinfo; + mutex_lock(&idrinfo->lock); + /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if + * it is just created, otherwise this is just a nop. + */ + idr_replace(&idrinfo->action_idr, a, a->tcfa_index); + mutex_unlock(&idrinfo->lock); + } +} + +struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, + bool rtnl_held, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[TCA_ACT_MAX + 1]; + struct tc_action_ops *a_o; + char act_name[IFNAMSIZ]; + struct nlattr *kind; + int err; + + if (!police) { + err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, + tcf_action_policy, extack); + if (err < 0) + return ERR_PTR(err); + err = -EINVAL; + kind = tb[TCA_ACT_KIND]; + if (!kind) { + NL_SET_ERR_MSG(extack, "TC action kind must be specified"); + return ERR_PTR(err); + } + if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) { + NL_SET_ERR_MSG(extack, "TC action name too long"); + return ERR_PTR(err); + } + } else { + if (strlcpy(act_name, "police", IFNAMSIZ) >= IFNAMSIZ) { + NL_SET_ERR_MSG(extack, "TC action name too long"); + return ERR_PTR(-EINVAL); + } + } + + 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) { + module_put(a_o->owner); + return ERR_PTR(-EAGAIN); + } +#endif + NL_SET_ERR_MSG(extack, "Failed to load TC action module"); + return ERR_PTR(-ENOENT); + } + + return a_o; +} + +struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, + struct nlattr *nla, struct nlattr *est, + struct tc_action_ops *a_o, int *init_res, + u32 flags, struct netlink_ext_ack *extack) +{ + bool police = flags & TCA_ACT_FLAGS_POLICE; + struct nla_bitfield32 userflags = { 0, 0 }; + u8 hw_stats = TCA_ACT_HW_STATS_ANY; + struct nlattr *tb[TCA_ACT_MAX + 1]; + struct tc_cookie *cookie = NULL; + struct tc_action *a; + int err; + + /* backward compatibility for policer */ + if (!police) { + err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, + tcf_action_policy, extack); + if (err < 0) + return ERR_PTR(err); + if (tb[TCA_ACT_COOKIE]) { + cookie = nla_memdup_cookie(tb); + if (!cookie) { + NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); + err = -ENOMEM; + goto err_out; + } + } + hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]); + if (tb[TCA_ACT_FLAGS]) { + userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]); + if (!tc_act_flags_valid(userflags.value)) { + err = -EINVAL; + goto err_out; + } + } + + err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp, + userflags.value | flags, extack); + } else { + err = a_o->init(net, nla, est, &a, tp, userflags.value | flags, + extack); + } + if (err < 0) + goto err_out; + *init_res = err; + + if (!police && tb[TCA_ACT_COOKIE]) + tcf_set_action_cookie(&a->act_cookie, cookie); + + if (!police) + a->hw_stats = hw_stats; + + return a; + +err_out: + if (cookie) { + kfree(cookie->data); + kfree(cookie); + } + return ERR_PTR(err); +} + +static bool tc_act_bind(u32 flags) +{ + return !!(flags & TCA_ACT_FLAGS_BIND); +} + +/* 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, struct tc_action *actions[], + int init_res[], size_t *attr_size, + u32 flags, u32 fl_flags, + struct netlink_ext_ack *extack) +{ + struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {}; + struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; + struct tc_action *act; + size_t sz = 0; + int err; + int i; + + err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, + extack); + if (err < 0) + return err; + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + struct tc_action_ops *a_o; + + a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE, + !(flags & TCA_ACT_FLAGS_NO_RTNL), + extack); + if (IS_ERR(a_o)) { + err = PTR_ERR(a_o); + goto err_mod; + } + ops[i - 1] = a_o; + } + + for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { + act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1], + &init_res[i - 1], flags, extack); + if (IS_ERR(act)) { + err = PTR_ERR(act); + goto err; + } + sz += tcf_action_fill_size(act); + /* Start from index 0 */ + actions[i - 1] = act; + if (tc_act_bind(flags)) { + bool skip_sw = tc_skip_sw(fl_flags); + bool skip_hw = tc_skip_hw(fl_flags); + + if (tc_act_bind(act->tcfa_flags)) + continue; + if (skip_sw != tc_act_skip_sw(act->tcfa_flags) || + skip_hw != tc_act_skip_hw(act->tcfa_flags)) { + NL_SET_ERR_MSG(extack, + "Mismatch between action and filter offload flags"); + err = -EINVAL; + goto err; + } + } else { + err = tcf_action_offload_add(act, extack); + if (tc_act_skip_sw(act->tcfa_flags) && err) + goto err; + } + } + + /* We have to commit them all together, because if any error happened in + * between, we could not handle the failure gracefully. + */ + tcf_idr_insert_many(actions); + + *attr_size = tcf_action_full_attrs_size(sz); + err = i - 1; + goto err_mod; + +err: + tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND); +err_mod: + for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { + if (ops[i]) + module_put(ops[i]->owner); + } + return err; +} + +void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, + u64 drops, bool hw) +{ + if (a->cpu_bstats) { + _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); + + this_cpu_ptr(a->cpu_qstats)->drops += drops; + + if (hw) + _bstats_update(this_cpu_ptr(a->cpu_bstats_hw), + bytes, packets); + return; + } + + _bstats_update(&a->tcfa_bstats, bytes, packets); + a->tcfa_qstats.drops += drops; + if (hw) + _bstats_update(&a->tcfa_bstats_hw, bytes, packets); +} +EXPORT_SYMBOL(tcf_action_update_stats); + +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; + + /* update hw stats for this action */ + tcf_action_update_hw_stats(p); + + /* 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(&d, p->cpu_bstats, + &p->tcfa_bstats, false) < 0 || + gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw, + &p->tcfa_bstats_hw, false) < 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 netlink_ext_ack *extack) +{ + 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; + + if (extack && extack->_msg && + nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg)) + goto out_nlmsg_trim; + + nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); + if (!nest) + goto out_nlmsg_trim; + + if (tcf_action_dump(skb, actions, bind, ref, false) < 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, NULL) <= 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_deprecated(tb, TCA_ACT_MAX, nla, + tcf_action_policy, 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 kind not found"); + goto err_out; + } + err = -ENOENT; + if (__tcf_idr_search(net, ops, &a, index) == 0) { + NL_SET_ERR_MSG(extack, "TC action with specified index not found"); + 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_deprecated(tb, TCA_ACT_MAX, nla, + tcf_action_policy, 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_noflag(skb, TCA_ACT_TAB); + if (!nest) { + NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); + goto out_module_put; + } + + err = __tcf_generic_walker(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) + 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_reoffload_del_notify(struct net *net, struct tc_action *action) +{ + size_t attr_size = tcf_action_fill_size(action); + struct tc_action *actions[TCA_ACT_MAX_PRIO] = { + [0] = action, + }; + const struct tc_action_ops *ops = action->ops; + struct sk_buff *skb; + int ret; + + skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, + GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) { + kfree_skb(skb); + return -EINVAL; + } + + ret = tcf_idr_release_unsafe(action); + if (ret == ACT_P_DELETED) { + module_put(ops->owner); + ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0); + } else { + kfree_skb(skb); + } + + return ret; +} + +int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, + void *cb_priv, bool add) +{ + struct tc_act_pernet_id *id_ptr; + struct tcf_idrinfo *idrinfo; + struct tc_action_net *tn; + struct tc_action *p; + unsigned int act_id; + unsigned long tmp; + unsigned long id; + struct idr *idr; + struct net *net; + int ret; + + if (!cb) + return -EINVAL; + + down_read(&net_rwsem); + mutex_lock(&act_id_mutex); + + for_each_net(net) { + list_for_each_entry(id_ptr, &act_pernet_id_list, list) { + act_id = id_ptr->id; + tn = net_generic(net, act_id); + if (!tn) + continue; + idrinfo = tn->idrinfo; + if (!idrinfo) + continue; + + mutex_lock(&idrinfo->lock); + idr = &idrinfo->action_idr; + idr_for_each_entry_ul(idr, p, tmp, id) { + if (IS_ERR(p) || tc_act_bind(p->tcfa_flags)) + continue; + if (add) { + tcf_action_offload_add_ex(p, NULL, cb, + cb_priv); + continue; + } + + /* cb unregister to update hw count */ + ret = tcf_action_offload_del_ex(p, cb, cb_priv); + if (ret < 0) + continue; + if (tc_act_skip_sw(p->tcfa_flags) && + !tc_act_in_hw(p)) + tcf_reoffload_del_notify(net, p); + } + mutex_unlock(&idrinfo->lock); + } + } + mutex_unlock(&act_id_mutex); + up_read(&net_rwsem); + + 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, extack) <= 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); + 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_deprecated(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; + + 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, extack) <= 0) { + NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); + kfree_skb(skb); + return -EINVAL; + } + + return rtnetlink_send(skb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); +} + +static int tcf_action_add(struct net *net, struct nlattr *nla, + struct nlmsghdr *n, u32 portid, u32 flags, + struct netlink_ext_ack *extack) +{ + size_t attr_size = 0; + int loop, ret, i; + struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; + int init_res[TCA_ACT_MAX_PRIO] = {}; + + for (loop = 0; loop < 10; loop++) { + ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res, + &attr_size, flags, 0, extack); + if (ret != -EAGAIN) + break; + } + + if (ret < 0) + return ret; + ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); + + /* only put existing actions */ + for (i = 0; i < TCA_ACT_MAX_PRIO; i++) + if (init_res[i] == ACT_P_CREATED) + actions[i] = NULL; + tcf_action_put_many(actions); + + return ret; +} + +static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { + [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON | + TCA_ACT_FLAG_TERSE_DUMP), + [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 = NETLINK_CB(skb).portid; + u32 flags = 0; + int ret = 0; + + if ((n->nlmsg_type != RTM_GETACTION) && + !netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + ret = nlmsg_parse_deprecated(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) + flags = TCA_ACT_FLAGS_REPLACE; + ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags, + 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_deprecated(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_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, 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_deprecated(cb->nlh, sizeof(struct tcamsg), tb, + TCA_ROOT_MAX, tcaa_policy, cb->extack); + 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_noflag(skb, TCA_ACT_TAB); + if (nest == NULL) + goto out_module_put; + + ret = __tcf_generic_walker(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; +} + +static int __init tc_action_init(void) +{ + 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); |