summaryrefslogtreecommitdiffstats
path: root/net/sched/act_api.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sched/act_api.c')
-rw-r--r--net/sched/act_api.c1705
1 files changed, 1705 insertions, 0 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
new file mode 100644
index 000000000..4ab9c2a6f
--- /dev/null
+++ b/net/sched/act_api.c
@@ -0,0 +1,1705 @@
+// 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/act_api.h>
+#include <net/netlink.h>
+
+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 tcf_action_cleanup(struct tc_action *p)
+{
+ if (p->ops->cleanup)
+ p->ops->cleanup(p);
+
+ gen_kill_estimator(&p->tcfa_rate_est);
+ free_tcf(p);
+}
+
+static int __tcf_action_put(struct tc_action *p, bool bind)
+{
+ struct tcf_idrinfo *idrinfo = p->idrinfo;
+
+ if (refcount_dec_and_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_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 = tcf_action_dump_1(skb, p, 0, 0);
+ if (err < 0) {
+ index--;
+ nlmsg_trim(skb, nest);
+ goto done;
+ }
+ nla_nest_end(skb, nest);
+ n_i++;
+ if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
+ n_i >= TCA_ACT_MAX_PRIO)
+ goto done;
+ }
+done:
+ if (index >= 0)
+ cb->args[0] = index + 1;
+
+ mutex_unlock(&idrinfo->lock);
+ if (n_i) {
+ if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
+ cb->args[1] = n_i;
+ }
+ return n_i;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ goto done;
+}
+
+static int tcf_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_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_cpu);
+ if (!p->cpu_bstats)
+ 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;
+ __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);
+
+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];
+ int repeat_ttl;
+
+ if (jmp_prgcnt > 0) {
+ jmp_prgcnt -= 1;
+ continue;
+ }
+
+ repeat_ttl = 32;
+repeat:
+ ret = a->ops->act(skb, a, res);
+
+ if (unlikely(ret == TC_ACT_REPEAT)) {
+ if (--repeat_ttl != 0)
+ goto repeat;
+ /* suspicious opcode, stop pipeline */
+ net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
+ return TC_ACT_OK;
+ }
+
+ if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
+ jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
+ if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
+ /* faulty opcode, stop pipeline */
+ return TC_ACT_OK;
+ } else {
+ jmp_ttl -= 1;
+ if (jmp_ttl > 0)
+ goto restart_act_graph;
+ else /* faulty graph, stop pipeline */
+ return TC_ACT_OK;
+ }
+ } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
+ 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);
+}
+
+static int
+tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a)
+{
+ 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;
+
+ 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;
+}
+
+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;
+
+ if (tcf_action_dump_terse(skb, a))
+ 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;
+
+ if (a->tcfa_flags &&
+ nla_put_bitfield32(skb, TCA_ACT_FLAGS,
+ a->tcfa_flags, a->tcfa_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, 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) :
+ 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_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(char *name, struct nlattr *nla,
+ 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 (name == NULL) {
+ 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_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
+ NL_SET_ERR_MSG(extack, "TC action name too long");
+ return ERR_PTR(err);
+ }
+ } else {
+ if (strlcpy(act_name, name, 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,
+ char *name, int ovr, int bind,
+ struct tc_action_ops *a_o, int *init_res,
+ bool rtnl_held,
+ struct netlink_ext_ack *extack)
+{
+ struct nla_bitfield32 flags = { 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 (name == NULL) {
+ 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])
+ flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
+
+ 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_out;
+ *init_res = err;
+
+ if (!name && tb[TCA_ACT_COOKIE])
+ tcf_set_action_cookie(&a->act_cookie, cookie);
+
+ if (!name)
+ a->hw_stats = hw_stats;
+
+ return a;
+
+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[], int init_res[], size_t *attr_size,
+ bool rtnl_held, 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(name, tb[i], rtnl_held, 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, name, ovr, bind,
+ ops[i - 1], &init_res[i - 1], 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;
+ }
+
+ /* 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, 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_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
+
+ this_cpu_ptr(a->cpu_qstats)->drops += drops;
+
+ if (hw)
+ _bstats_cpu_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;
+
+ /* 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, 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) <= 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, 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, NULL, ovr, 0,
+ actions, init_res, &attr_size, true, 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_FLAG_LARGE_DUMP_ON),
+ [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;
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 09:20:34 +0000