1ae78780ed
Pull RCU updates from Ingo Molnar: "The main changes in this cycle were: - Dynamic tick (nohz) updates, perhaps most notably changes to force the tick on when needed due to lengthy in-kernel execution on CPUs on which RCU is waiting. - Linux-kernel memory consistency model updates. - Replace rcu_swap_protected() with rcu_prepace_pointer(). - Torture-test updates. - Documentation updates. - Miscellaneous fixes" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (51 commits) security/safesetid: Replace rcu_swap_protected() with rcu_replace_pointer() net/sched: Replace rcu_swap_protected() with rcu_replace_pointer() net/netfilter: Replace rcu_swap_protected() with rcu_replace_pointer() net/core: Replace rcu_swap_protected() with rcu_replace_pointer() bpf/cgroup: Replace rcu_swap_protected() with rcu_replace_pointer() fs/afs: Replace rcu_swap_protected() with rcu_replace_pointer() drivers/scsi: Replace rcu_swap_protected() with rcu_replace_pointer() drm/i915: Replace rcu_swap_protected() with rcu_replace_pointer() x86/kvm/pmu: Replace rcu_swap_protected() with rcu_replace_pointer() rcu: Upgrade rcu_swap_protected() to rcu_replace_pointer() rcu: Suppress levelspread uninitialized messages rcu: Fix uninitialized variable in nocb_gp_wait() rcu: Update descriptions for rcu_future_grace_period tracepoint rcu: Update descriptions for rcu_nocb_wake tracepoint rcu: Remove obsolete descriptions for rcu_barrier tracepoint rcu: Ensure that ->rcu_urgent_qs is set before resched IPI workqueue: Convert for_each_wq to use built-in list check rcu: Several rcu_segcblist functions can be static rcu: Remove unused function hlist_bl_del_init_rcu() Documentation: Rename rcu_node_context_switch() to rcu_note_context_switch() ...
1604 lines
38 KiB
C
1604 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/act_api.c Packet action API.
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*
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* Author: Jamal Hadi Salim
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/sch_generic.h>
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#include <net/pkt_cls.h>
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#include <net/act_api.h>
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#include <net/netlink.h>
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static void tcf_action_goto_chain_exec(const struct tc_action *a,
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struct tcf_result *res)
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{
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const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
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res->goto_tp = rcu_dereference_bh(chain->filter_chain);
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}
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static void tcf_free_cookie_rcu(struct rcu_head *p)
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{
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struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
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kfree(cookie->data);
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kfree(cookie);
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}
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static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
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struct tc_cookie *new_cookie)
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{
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struct tc_cookie *old;
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old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
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if (old)
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call_rcu(&old->rcu, tcf_free_cookie_rcu);
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}
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int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
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struct tcf_chain **newchain,
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struct netlink_ext_ack *extack)
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{
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int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
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u32 chain_index;
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if (!opcode)
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ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
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else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
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ret = 0;
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if (ret) {
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NL_SET_ERR_MSG(extack, "invalid control action");
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goto end;
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}
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if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
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chain_index = action & TC_ACT_EXT_VAL_MASK;
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if (!tp || !newchain) {
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ret = -EINVAL;
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NL_SET_ERR_MSG(extack,
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"can't goto NULL proto/chain");
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goto end;
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}
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*newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
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if (!*newchain) {
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ret = -ENOMEM;
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NL_SET_ERR_MSG(extack,
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"can't allocate goto_chain");
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}
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}
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end:
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return ret;
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}
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EXPORT_SYMBOL(tcf_action_check_ctrlact);
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struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
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struct tcf_chain *goto_chain)
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{
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a->tcfa_action = action;
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goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
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return goto_chain;
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}
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EXPORT_SYMBOL(tcf_action_set_ctrlact);
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/* XXX: For standalone actions, we don't need a RCU grace period either, because
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* actions are always connected to filters and filters are already destroyed in
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* RCU callbacks, so after a RCU grace period actions are already disconnected
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* from filters. Readers later can not find us.
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*/
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static void free_tcf(struct tc_action *p)
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{
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struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
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free_percpu(p->cpu_bstats);
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free_percpu(p->cpu_bstats_hw);
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free_percpu(p->cpu_qstats);
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tcf_set_action_cookie(&p->act_cookie, NULL);
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if (chain)
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tcf_chain_put_by_act(chain);
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kfree(p);
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}
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static void tcf_action_cleanup(struct tc_action *p)
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{
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if (p->ops->cleanup)
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p->ops->cleanup(p);
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gen_kill_estimator(&p->tcfa_rate_est);
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free_tcf(p);
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}
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static int __tcf_action_put(struct tc_action *p, bool bind)
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{
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struct tcf_idrinfo *idrinfo = p->idrinfo;
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if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
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if (bind)
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atomic_dec(&p->tcfa_bindcnt);
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idr_remove(&idrinfo->action_idr, p->tcfa_index);
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mutex_unlock(&idrinfo->lock);
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tcf_action_cleanup(p);
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return 1;
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}
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if (bind)
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atomic_dec(&p->tcfa_bindcnt);
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return 0;
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}
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int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
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{
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int ret = 0;
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/* Release with strict==1 and bind==0 is only called through act API
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* interface (classifiers always bind). Only case when action with
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* positive reference count and zero bind count can exist is when it was
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* also created with act API (unbinding last classifier will destroy the
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* action if it was created by classifier). So only case when bind count
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* can be changed after initial check is when unbound action is
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* destroyed by act API while classifier binds to action with same id
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* concurrently. This result either creation of new action(same behavior
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* as before), or reusing existing action if concurrent process
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* increments reference count before action is deleted. Both scenarios
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* are acceptable.
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*/
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if (p) {
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if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
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return -EPERM;
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if (__tcf_action_put(p, bind))
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ret = ACT_P_DELETED;
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}
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return ret;
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}
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EXPORT_SYMBOL(__tcf_idr_release);
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static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
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{
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struct tc_cookie *act_cookie;
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u32 cookie_len = 0;
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rcu_read_lock();
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act_cookie = rcu_dereference(act->act_cookie);
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if (act_cookie)
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cookie_len = nla_total_size(act_cookie->len);
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rcu_read_unlock();
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return nla_total_size(0) /* action number nested */
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+ nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
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+ cookie_len /* TCA_ACT_COOKIE */
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+ nla_total_size(0) /* TCA_ACT_STATS nested */
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/* TCA_STATS_BASIC */
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+ nla_total_size_64bit(sizeof(struct gnet_stats_basic))
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/* TCA_STATS_PKT64 */
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+ nla_total_size_64bit(sizeof(u64))
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/* TCA_STATS_QUEUE */
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+ nla_total_size_64bit(sizeof(struct gnet_stats_queue))
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+ nla_total_size(0) /* TCA_OPTIONS nested */
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+ nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
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}
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static size_t tcf_action_full_attrs_size(size_t sz)
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{
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return NLMSG_HDRLEN /* struct nlmsghdr */
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+ sizeof(struct tcamsg)
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+ nla_total_size(0) /* TCA_ACT_TAB nested */
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+ sz;
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}
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static size_t tcf_action_fill_size(const struct tc_action *act)
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{
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size_t sz = tcf_action_shared_attrs_size(act);
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if (act->ops->get_fill_size)
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return act->ops->get_fill_size(act) + sz;
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return sz;
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}
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static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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int err = 0, index = -1, s_i = 0, n_i = 0;
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u32 act_flags = cb->args[2];
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unsigned long jiffy_since = cb->args[3];
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struct nlattr *nest;
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struct idr *idr = &idrinfo->action_idr;
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struct tc_action *p;
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unsigned long id = 1;
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unsigned long tmp;
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mutex_lock(&idrinfo->lock);
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s_i = cb->args[0];
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idr_for_each_entry_ul(idr, p, tmp, id) {
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index++;
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if (index < s_i)
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continue;
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if (jiffy_since &&
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time_after(jiffy_since,
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(unsigned long)p->tcfa_tm.lastuse))
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continue;
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nest = nla_nest_start_noflag(skb, n_i);
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if (!nest) {
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index--;
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goto nla_put_failure;
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}
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err = tcf_action_dump_1(skb, p, 0, 0);
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if (err < 0) {
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index--;
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nlmsg_trim(skb, nest);
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goto done;
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}
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nla_nest_end(skb, nest);
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n_i++;
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if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
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n_i >= TCA_ACT_MAX_PRIO)
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goto done;
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}
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done:
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if (index >= 0)
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cb->args[0] = index + 1;
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mutex_unlock(&idrinfo->lock);
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if (n_i) {
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if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
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cb->args[1] = n_i;
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}
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return n_i;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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goto done;
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}
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static int tcf_idr_release_unsafe(struct tc_action *p)
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{
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if (atomic_read(&p->tcfa_bindcnt) > 0)
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return -EPERM;
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if (refcount_dec_and_test(&p->tcfa_refcnt)) {
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idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
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tcf_action_cleanup(p);
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return ACT_P_DELETED;
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}
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return 0;
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}
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static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
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const struct tc_action_ops *ops)
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{
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struct nlattr *nest;
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int n_i = 0;
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int ret = -EINVAL;
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struct idr *idr = &idrinfo->action_idr;
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struct tc_action *p;
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unsigned long id = 1;
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unsigned long tmp;
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nest = nla_nest_start_noflag(skb, 0);
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if (nest == NULL)
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goto nla_put_failure;
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if (nla_put_string(skb, TCA_KIND, ops->kind))
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goto nla_put_failure;
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mutex_lock(&idrinfo->lock);
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idr_for_each_entry_ul(idr, p, tmp, id) {
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ret = tcf_idr_release_unsafe(p);
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if (ret == ACT_P_DELETED) {
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module_put(ops->owner);
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n_i++;
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} else if (ret < 0) {
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mutex_unlock(&idrinfo->lock);
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goto nla_put_failure;
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}
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}
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mutex_unlock(&idrinfo->lock);
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if (nla_put_u32(skb, TCA_FCNT, n_i))
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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return n_i;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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return ret;
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}
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int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops,
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struct netlink_ext_ack *extack)
|
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{
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struct tcf_idrinfo *idrinfo = tn->idrinfo;
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if (type == RTM_DELACTION) {
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return tcf_del_walker(idrinfo, skb, ops);
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} else if (type == RTM_GETACTION) {
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return tcf_dump_walker(idrinfo, skb, cb);
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} else {
|
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WARN(1, "tcf_generic_walker: unknown command %d\n", type);
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NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
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return -EINVAL;
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}
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}
|
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EXPORT_SYMBOL(tcf_generic_walker);
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|
|
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int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
|
|
{
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struct tcf_idrinfo *idrinfo = tn->idrinfo;
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struct tc_action *p;
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mutex_lock(&idrinfo->lock);
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p = idr_find(&idrinfo->action_idr, index);
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if (IS_ERR(p))
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p = NULL;
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else if (p)
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refcount_inc(&p->tcfa_refcnt);
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mutex_unlock(&idrinfo->lock);
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|
|
|
if (p) {
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*a = p;
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return true;
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}
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return false;
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}
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EXPORT_SYMBOL(tcf_idr_search);
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static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
|
|
{
|
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struct tc_action *p;
|
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int ret = 0;
|
|
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mutex_lock(&idrinfo->lock);
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p = idr_find(&idrinfo->action_idr, index);
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if (!p) {
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mutex_unlock(&idrinfo->lock);
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return -ENOENT;
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}
|
|
|
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if (!atomic_read(&p->tcfa_bindcnt)) {
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if (refcount_dec_and_test(&p->tcfa_refcnt)) {
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struct module *owner = p->ops->owner;
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|
|
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WARN_ON(p != idr_remove(&idrinfo->action_idr,
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p->tcfa_index));
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mutex_unlock(&idrinfo->lock);
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|
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tcf_action_cleanup(p);
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module_put(owner);
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return 0;
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}
|
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ret = 0;
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} else {
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ret = -EPERM;
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}
|
|
|
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mutex_unlock(&idrinfo->lock);
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return ret;
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}
|
|
|
|
int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
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struct tc_action **a, const struct tc_action_ops *ops,
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int bind, bool cpustats, u32 flags)
|
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{
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struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
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struct tcf_idrinfo *idrinfo = tn->idrinfo;
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int err = -ENOMEM;
|
|
|
|
if (unlikely(!p))
|
|
return -ENOMEM;
|
|
refcount_set(&p->tcfa_refcnt, 1);
|
|
if (bind)
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|
atomic_set(&p->tcfa_bindcnt, 1);
|
|
|
|
if (cpustats) {
|
|
p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
|
|
if (!p->cpu_bstats)
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|
goto err1;
|
|
p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
|
|
if (!p->cpu_bstats_hw)
|
|
goto err2;
|
|
p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
|
|
if (!p->cpu_qstats)
|
|
goto err3;
|
|
}
|
|
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, NULL, est);
|
|
if (err)
|
|
goto err4;
|
|
}
|
|
|
|
p->idrinfo = idrinfo;
|
|
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);
|
|
|
|
void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
|
|
{
|
|
struct tcf_idrinfo *idrinfo = tn->idrinfo;
|
|
|
|
mutex_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)));
|
|
mutex_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;
|
|
|
|
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);
|
|
|
|
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->id == a->id || (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];
|
|
|
|
if (jmp_prgcnt > 0) {
|
|
jmp_prgcnt -= 1;
|
|
continue;
|
|
}
|
|
repeat:
|
|
ret = a->ops->act(skb, a, res);
|
|
if (ret == TC_ACT_REPEAT)
|
|
goto repeat; /* we need a ttl - JHS */
|
|
|
|
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_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();
|
|
|
|
if (a->tcfa_flags) {
|
|
struct nla_bitfield32 flags = { a->tcfa_flags,
|
|
a->tcfa_flags, };
|
|
|
|
if (nla_put(skb, TCA_ACT_FLAGS, sizeof(flags), &flags))
|
|
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)
|
|
{
|
|
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 = 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 const u32 tca_act_flags_allowed = TCA_ACT_FLAGS_NO_PERCPU_STATS;
|
|
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] = { .type = NLA_BITFIELD32,
|
|
.validation_data = &tca_act_flags_allowed },
|
|
};
|
|
|
|
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 nla_bitfield32 flags = { 0, 0 };
|
|
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_deprecated(tb, TCA_ACT_MAX, nla,
|
|
tcf_action_policy, 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]) {
|
|
cookie = nla_memdup_cookie(tb);
|
|
if (!cookie) {
|
|
NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
|
|
err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
}
|
|
if (tb[TCA_ACT_FLAGS])
|
|
flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
|
|
} 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, tp, flags.value, extack);
|
|
else
|
|
err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
|
|
tp, flags.value, 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) &&
|
|
!rcu_access_pointer(a->goto_chain)) {
|
|
tcf_action_destroy_1(a, bind);
|
|
NL_SET_ERR_MSG(extack, "can't use goto chain with NULL chain");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
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_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++) {
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
|
|
void tcf_action_update_stats(struct tc_action *a, u64 bytes, u32 packets,
|
|
bool drop, bool hw)
|
|
{
|
|
if (a->cpu_bstats) {
|
|
_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
|
|
|
|
if (drop)
|
|
this_cpu_ptr(a->cpu_qstats)->drops += packets;
|
|
|
|
if (hw)
|
|
_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
|
|
bytes, packets);
|
|
return;
|
|
}
|
|
|
|
_bstats_update(&a->tcfa_bstats, bytes, packets);
|
|
if (drop)
|
|
a->tcfa_qstats.drops += packets;
|
|
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;
|
|
|
|
/* 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_basic_hw(NULL, &d, p->cpu_bstats_hw,
|
|
&p->tcfa_bstats_hw) < 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_noflag(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_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 (ops->lookup(net, &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 = 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_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;
|
|
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_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)
|
|
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_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 = 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;
|
|
}
|
|
|
|
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);
|