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3919 lines
97 KiB
3919 lines
97 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* net/sched/cls_api.c Packet classifier API. |
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* |
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* Authors: Alexey Kuznetsov, <[email protected]> |
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* |
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* Changes: |
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* |
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* Eduardo J. Blanco <[email protected]> :990222: kmod support |
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*/ |
|
|
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#include <linux/module.h> |
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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/err.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/slab.h> |
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#include <linux/idr.h> |
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#include <linux/jhash.h> |
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#include <linux/rculist.h> |
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#include <net/net_namespace.h> |
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#include <net/sock.h> |
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#include <net/netlink.h> |
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#include <net/pkt_sched.h> |
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#include <net/pkt_cls.h> |
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#include <net/tc_act/tc_pedit.h> |
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#include <net/tc_act/tc_mirred.h> |
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#include <net/tc_act/tc_vlan.h> |
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#include <net/tc_act/tc_tunnel_key.h> |
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#include <net/tc_act/tc_csum.h> |
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#include <net/tc_act/tc_gact.h> |
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#include <net/tc_act/tc_police.h> |
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#include <net/tc_act/tc_sample.h> |
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#include <net/tc_act/tc_skbedit.h> |
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#include <net/tc_act/tc_ct.h> |
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#include <net/tc_act/tc_mpls.h> |
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#include <net/tc_act/tc_gate.h> |
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#include <net/flow_offload.h> |
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|
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extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; |
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|
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/* The list of all installed classifier types */ |
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static LIST_HEAD(tcf_proto_base); |
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|
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/* Protects list of registered TC modules. It is pure SMP lock. */ |
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static DEFINE_RWLOCK(cls_mod_lock); |
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|
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static u32 destroy_obj_hashfn(const struct tcf_proto *tp) |
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{ |
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return jhash_3words(tp->chain->index, tp->prio, |
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(__force __u32)tp->protocol, 0); |
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} |
|
|
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static void tcf_proto_signal_destroying(struct tcf_chain *chain, |
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struct tcf_proto *tp) |
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{ |
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struct tcf_block *block = chain->block; |
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|
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mutex_lock(&block->proto_destroy_lock); |
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hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node, |
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destroy_obj_hashfn(tp)); |
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mutex_unlock(&block->proto_destroy_lock); |
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} |
|
|
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static bool tcf_proto_cmp(const struct tcf_proto *tp1, |
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const struct tcf_proto *tp2) |
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{ |
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return tp1->chain->index == tp2->chain->index && |
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tp1->prio == tp2->prio && |
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tp1->protocol == tp2->protocol; |
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} |
|
|
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static bool tcf_proto_exists_destroying(struct tcf_chain *chain, |
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struct tcf_proto *tp) |
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{ |
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u32 hash = destroy_obj_hashfn(tp); |
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struct tcf_proto *iter; |
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bool found = false; |
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|
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rcu_read_lock(); |
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hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter, |
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destroy_ht_node, hash) { |
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if (tcf_proto_cmp(tp, iter)) { |
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found = true; |
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break; |
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} |
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} |
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rcu_read_unlock(); |
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|
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return found; |
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} |
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|
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static void |
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tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp) |
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{ |
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struct tcf_block *block = chain->block; |
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|
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mutex_lock(&block->proto_destroy_lock); |
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if (hash_hashed(&tp->destroy_ht_node)) |
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hash_del_rcu(&tp->destroy_ht_node); |
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mutex_unlock(&block->proto_destroy_lock); |
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} |
|
|
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/* Find classifier type by string name */ |
|
|
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static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind) |
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{ |
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const struct tcf_proto_ops *t, *res = NULL; |
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|
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if (kind) { |
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read_lock(&cls_mod_lock); |
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list_for_each_entry(t, &tcf_proto_base, head) { |
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if (strcmp(kind, t->kind) == 0) { |
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if (try_module_get(t->owner)) |
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res = t; |
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break; |
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} |
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} |
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read_unlock(&cls_mod_lock); |
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} |
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return res; |
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} |
|
|
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static const struct tcf_proto_ops * |
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tcf_proto_lookup_ops(const char *kind, bool rtnl_held, |
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struct netlink_ext_ack *extack) |
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{ |
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const struct tcf_proto_ops *ops; |
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|
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ops = __tcf_proto_lookup_ops(kind); |
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if (ops) |
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return ops; |
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#ifdef CONFIG_MODULES |
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if (rtnl_held) |
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rtnl_unlock(); |
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request_module("cls_%s", kind); |
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if (rtnl_held) |
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rtnl_lock(); |
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ops = __tcf_proto_lookup_ops(kind); |
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/* We dropped the RTNL semaphore in order to perform |
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* the module load. So, even if we succeeded in loading |
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* the module we have to replay the request. We indicate |
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* this using -EAGAIN. |
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*/ |
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if (ops) { |
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module_put(ops->owner); |
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return ERR_PTR(-EAGAIN); |
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} |
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#endif |
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NL_SET_ERR_MSG(extack, "TC classifier not found"); |
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return ERR_PTR(-ENOENT); |
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} |
|
|
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/* Register(unregister) new classifier type */ |
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|
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int register_tcf_proto_ops(struct tcf_proto_ops *ops) |
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{ |
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struct tcf_proto_ops *t; |
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int rc = -EEXIST; |
|
|
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write_lock(&cls_mod_lock); |
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list_for_each_entry(t, &tcf_proto_base, head) |
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if (!strcmp(ops->kind, t->kind)) |
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goto out; |
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|
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list_add_tail(&ops->head, &tcf_proto_base); |
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rc = 0; |
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out: |
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write_unlock(&cls_mod_lock); |
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return rc; |
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} |
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EXPORT_SYMBOL(register_tcf_proto_ops); |
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|
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static struct workqueue_struct *tc_filter_wq; |
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|
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int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
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{ |
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struct tcf_proto_ops *t; |
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int rc = -ENOENT; |
|
|
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/* Wait for outstanding call_rcu()s, if any, from a |
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* tcf_proto_ops's destroy() handler. |
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*/ |
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rcu_barrier(); |
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flush_workqueue(tc_filter_wq); |
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|
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write_lock(&cls_mod_lock); |
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list_for_each_entry(t, &tcf_proto_base, head) { |
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if (t == ops) { |
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list_del(&t->head); |
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rc = 0; |
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break; |
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} |
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} |
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write_unlock(&cls_mod_lock); |
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return rc; |
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} |
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EXPORT_SYMBOL(unregister_tcf_proto_ops); |
|
|
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bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) |
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{ |
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INIT_RCU_WORK(rwork, func); |
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return queue_rcu_work(tc_filter_wq, rwork); |
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} |
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EXPORT_SYMBOL(tcf_queue_work); |
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|
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/* Select new prio value from the range, managed by kernel. */ |
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|
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static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
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{ |
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u32 first = TC_H_MAKE(0xC0000000U, 0U); |
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|
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if (tp) |
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first = tp->prio - 1; |
|
|
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return TC_H_MAJ(first); |
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} |
|
|
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static bool tcf_proto_check_kind(struct nlattr *kind, char *name) |
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{ |
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if (kind) |
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return nla_strscpy(name, kind, IFNAMSIZ) < 0; |
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memset(name, 0, IFNAMSIZ); |
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return false; |
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} |
|
|
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static bool tcf_proto_is_unlocked(const char *kind) |
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{ |
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const struct tcf_proto_ops *ops; |
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bool ret; |
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|
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if (strlen(kind) == 0) |
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return false; |
|
|
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ops = tcf_proto_lookup_ops(kind, false, NULL); |
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/* On error return false to take rtnl lock. Proto lookup/create |
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* functions will perform lookup again and properly handle errors. |
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*/ |
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if (IS_ERR(ops)) |
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return false; |
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|
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ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED); |
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module_put(ops->owner); |
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return ret; |
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} |
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|
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static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
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u32 prio, struct tcf_chain *chain, |
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bool rtnl_held, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tcf_proto *tp; |
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int err; |
|
|
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tp = kzalloc(sizeof(*tp), GFP_KERNEL); |
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if (!tp) |
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return ERR_PTR(-ENOBUFS); |
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|
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tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack); |
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if (IS_ERR(tp->ops)) { |
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err = PTR_ERR(tp->ops); |
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goto errout; |
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} |
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tp->classify = tp->ops->classify; |
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tp->protocol = protocol; |
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tp->prio = prio; |
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tp->chain = chain; |
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spin_lock_init(&tp->lock); |
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refcount_set(&tp->refcnt, 1); |
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|
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err = tp->ops->init(tp); |
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if (err) { |
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module_put(tp->ops->owner); |
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goto errout; |
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} |
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return tp; |
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|
|
errout: |
|
kfree(tp); |
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return ERR_PTR(err); |
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} |
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|
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static void tcf_proto_get(struct tcf_proto *tp) |
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{ |
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refcount_inc(&tp->refcnt); |
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} |
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|
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static void tcf_chain_put(struct tcf_chain *chain); |
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|
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static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held, |
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bool sig_destroy, struct netlink_ext_ack *extack) |
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{ |
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tp->ops->destroy(tp, rtnl_held, extack); |
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if (sig_destroy) |
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tcf_proto_signal_destroyed(tp->chain, tp); |
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tcf_chain_put(tp->chain); |
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module_put(tp->ops->owner); |
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kfree_rcu(tp, rcu); |
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} |
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|
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static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held, |
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struct netlink_ext_ack *extack) |
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{ |
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if (refcount_dec_and_test(&tp->refcnt)) |
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tcf_proto_destroy(tp, rtnl_held, true, extack); |
|
} |
|
|
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static bool tcf_proto_check_delete(struct tcf_proto *tp) |
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{ |
|
if (tp->ops->delete_empty) |
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return tp->ops->delete_empty(tp); |
|
|
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tp->deleting = true; |
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return tp->deleting; |
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} |
|
|
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static void tcf_proto_mark_delete(struct tcf_proto *tp) |
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{ |
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spin_lock(&tp->lock); |
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tp->deleting = true; |
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spin_unlock(&tp->lock); |
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} |
|
|
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static bool tcf_proto_is_deleting(struct tcf_proto *tp) |
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{ |
|
bool deleting; |
|
|
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spin_lock(&tp->lock); |
|
deleting = tp->deleting; |
|
spin_unlock(&tp->lock); |
|
|
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return deleting; |
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} |
|
|
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#define ASSERT_BLOCK_LOCKED(block) \ |
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lockdep_assert_held(&(block)->lock) |
|
|
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struct tcf_filter_chain_list_item { |
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struct list_head list; |
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tcf_chain_head_change_t *chain_head_change; |
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void *chain_head_change_priv; |
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}; |
|
|
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static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
|
u32 chain_index) |
|
{ |
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struct tcf_chain *chain; |
|
|
|
ASSERT_BLOCK_LOCKED(block); |
|
|
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chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
|
if (!chain) |
|
return NULL; |
|
list_add_tail_rcu(&chain->list, &block->chain_list); |
|
mutex_init(&chain->filter_chain_lock); |
|
chain->block = block; |
|
chain->index = chain_index; |
|
chain->refcnt = 1; |
|
if (!chain->index) |
|
block->chain0.chain = chain; |
|
return chain; |
|
} |
|
|
|
static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, |
|
struct tcf_proto *tp_head) |
|
{ |
|
if (item->chain_head_change) |
|
item->chain_head_change(tp_head, item->chain_head_change_priv); |
|
} |
|
|
|
static void tcf_chain0_head_change(struct tcf_chain *chain, |
|
struct tcf_proto *tp_head) |
|
{ |
|
struct tcf_filter_chain_list_item *item; |
|
struct tcf_block *block = chain->block; |
|
|
|
if (chain->index) |
|
return; |
|
|
|
mutex_lock(&block->lock); |
|
list_for_each_entry(item, &block->chain0.filter_chain_list, list) |
|
tcf_chain_head_change_item(item, tp_head); |
|
mutex_unlock(&block->lock); |
|
} |
|
|
|
/* Returns true if block can be safely freed. */ |
|
|
|
static bool tcf_chain_detach(struct tcf_chain *chain) |
|
{ |
|
struct tcf_block *block = chain->block; |
|
|
|
ASSERT_BLOCK_LOCKED(block); |
|
|
|
list_del_rcu(&chain->list); |
|
if (!chain->index) |
|
block->chain0.chain = NULL; |
|
|
|
if (list_empty(&block->chain_list) && |
|
refcount_read(&block->refcnt) == 0) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
static void tcf_block_destroy(struct tcf_block *block) |
|
{ |
|
mutex_destroy(&block->lock); |
|
mutex_destroy(&block->proto_destroy_lock); |
|
kfree_rcu(block, rcu); |
|
} |
|
|
|
static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block) |
|
{ |
|
struct tcf_block *block = chain->block; |
|
|
|
mutex_destroy(&chain->filter_chain_lock); |
|
kfree_rcu(chain, rcu); |
|
if (free_block) |
|
tcf_block_destroy(block); |
|
} |
|
|
|
static void tcf_chain_hold(struct tcf_chain *chain) |
|
{ |
|
ASSERT_BLOCK_LOCKED(chain->block); |
|
|
|
++chain->refcnt; |
|
} |
|
|
|
static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) |
|
{ |
|
ASSERT_BLOCK_LOCKED(chain->block); |
|
|
|
/* In case all the references are action references, this |
|
* chain should not be shown to the user. |
|
*/ |
|
return chain->refcnt == chain->action_refcnt; |
|
} |
|
|
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static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, |
|
u32 chain_index) |
|
{ |
|
struct tcf_chain *chain; |
|
|
|
ASSERT_BLOCK_LOCKED(block); |
|
|
|
list_for_each_entry(chain, &block->chain_list, list) { |
|
if (chain->index == chain_index) |
|
return chain; |
|
} |
|
return NULL; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT) |
|
static struct tcf_chain *tcf_chain_lookup_rcu(const struct tcf_block *block, |
|
u32 chain_index) |
|
{ |
|
struct tcf_chain *chain; |
|
|
|
list_for_each_entry_rcu(chain, &block->chain_list, list) { |
|
if (chain->index == chain_index) |
|
return chain; |
|
} |
|
return NULL; |
|
} |
|
#endif |
|
|
|
static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, |
|
u32 seq, u16 flags, int event, bool unicast); |
|
|
|
static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, |
|
u32 chain_index, bool create, |
|
bool by_act) |
|
{ |
|
struct tcf_chain *chain = NULL; |
|
bool is_first_reference; |
|
|
|
mutex_lock(&block->lock); |
|
chain = tcf_chain_lookup(block, chain_index); |
|
if (chain) { |
|
tcf_chain_hold(chain); |
|
} else { |
|
if (!create) |
|
goto errout; |
|
chain = tcf_chain_create(block, chain_index); |
|
if (!chain) |
|
goto errout; |
|
} |
|
|
|
if (by_act) |
|
++chain->action_refcnt; |
|
is_first_reference = chain->refcnt - chain->action_refcnt == 1; |
|
mutex_unlock(&block->lock); |
|
|
|
/* Send notification only in case we got the first |
|
* non-action reference. Until then, the chain acts only as |
|
* a placeholder for actions pointing to it and user ought |
|
* not know about them. |
|
*/ |
|
if (is_first_reference && !by_act) |
|
tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
|
RTM_NEWCHAIN, false); |
|
|
|
return chain; |
|
|
|
errout: |
|
mutex_unlock(&block->lock); |
|
return chain; |
|
} |
|
|
|
static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
|
bool create) |
|
{ |
|
return __tcf_chain_get(block, chain_index, create, false); |
|
} |
|
|
|
struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) |
|
{ |
|
return __tcf_chain_get(block, chain_index, true, true); |
|
} |
|
EXPORT_SYMBOL(tcf_chain_get_by_act); |
|
|
|
static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
|
void *tmplt_priv); |
|
static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, |
|
void *tmplt_priv, u32 chain_index, |
|
struct tcf_block *block, struct sk_buff *oskb, |
|
u32 seq, u16 flags, bool unicast); |
|
|
|
static void __tcf_chain_put(struct tcf_chain *chain, bool by_act, |
|
bool explicitly_created) |
|
{ |
|
struct tcf_block *block = chain->block; |
|
const struct tcf_proto_ops *tmplt_ops; |
|
bool free_block = false; |
|
unsigned int refcnt; |
|
void *tmplt_priv; |
|
|
|
mutex_lock(&block->lock); |
|
if (explicitly_created) { |
|
if (!chain->explicitly_created) { |
|
mutex_unlock(&block->lock); |
|
return; |
|
} |
|
chain->explicitly_created = false; |
|
} |
|
|
|
if (by_act) |
|
chain->action_refcnt--; |
|
|
|
/* tc_chain_notify_delete can't be called while holding block lock. |
|
* However, when block is unlocked chain can be changed concurrently, so |
|
* save these to temporary variables. |
|
*/ |
|
refcnt = --chain->refcnt; |
|
tmplt_ops = chain->tmplt_ops; |
|
tmplt_priv = chain->tmplt_priv; |
|
|
|
/* The last dropped non-action reference will trigger notification. */ |
|
if (refcnt - chain->action_refcnt == 0 && !by_act) { |
|
tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index, |
|
block, NULL, 0, 0, false); |
|
/* Last reference to chain, no need to lock. */ |
|
chain->flushing = false; |
|
} |
|
|
|
if (refcnt == 0) |
|
free_block = tcf_chain_detach(chain); |
|
mutex_unlock(&block->lock); |
|
|
|
if (refcnt == 0) { |
|
tc_chain_tmplt_del(tmplt_ops, tmplt_priv); |
|
tcf_chain_destroy(chain, free_block); |
|
} |
|
} |
|
|
|
static void tcf_chain_put(struct tcf_chain *chain) |
|
{ |
|
__tcf_chain_put(chain, false, false); |
|
} |
|
|
|
void tcf_chain_put_by_act(struct tcf_chain *chain) |
|
{ |
|
__tcf_chain_put(chain, true, false); |
|
} |
|
EXPORT_SYMBOL(tcf_chain_put_by_act); |
|
|
|
static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) |
|
{ |
|
__tcf_chain_put(chain, false, true); |
|
} |
|
|
|
static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held) |
|
{ |
|
struct tcf_proto *tp, *tp_next; |
|
|
|
mutex_lock(&chain->filter_chain_lock); |
|
tp = tcf_chain_dereference(chain->filter_chain, chain); |
|
while (tp) { |
|
tp_next = rcu_dereference_protected(tp->next, 1); |
|
tcf_proto_signal_destroying(chain, tp); |
|
tp = tp_next; |
|
} |
|
tp = tcf_chain_dereference(chain->filter_chain, chain); |
|
RCU_INIT_POINTER(chain->filter_chain, NULL); |
|
tcf_chain0_head_change(chain, NULL); |
|
chain->flushing = true; |
|
mutex_unlock(&chain->filter_chain_lock); |
|
|
|
while (tp) { |
|
tp_next = rcu_dereference_protected(tp->next, 1); |
|
tcf_proto_put(tp, rtnl_held, NULL); |
|
tp = tp_next; |
|
} |
|
} |
|
|
|
static int tcf_block_setup(struct tcf_block *block, |
|
struct flow_block_offload *bo); |
|
|
|
static void tcf_block_offload_init(struct flow_block_offload *bo, |
|
struct net_device *dev, struct Qdisc *sch, |
|
enum flow_block_command command, |
|
enum flow_block_binder_type binder_type, |
|
struct flow_block *flow_block, |
|
bool shared, struct netlink_ext_ack *extack) |
|
{ |
|
bo->net = dev_net(dev); |
|
bo->command = command; |
|
bo->binder_type = binder_type; |
|
bo->block = flow_block; |
|
bo->block_shared = shared; |
|
bo->extack = extack; |
|
bo->sch = sch; |
|
INIT_LIST_HEAD(&bo->cb_list); |
|
} |
|
|
|
static void tcf_block_unbind(struct tcf_block *block, |
|
struct flow_block_offload *bo); |
|
|
|
static void tc_block_indr_cleanup(struct flow_block_cb *block_cb) |
|
{ |
|
struct tcf_block *block = block_cb->indr.data; |
|
struct net_device *dev = block_cb->indr.dev; |
|
struct Qdisc *sch = block_cb->indr.sch; |
|
struct netlink_ext_ack extack = {}; |
|
struct flow_block_offload bo = {}; |
|
|
|
tcf_block_offload_init(&bo, dev, sch, FLOW_BLOCK_UNBIND, |
|
block_cb->indr.binder_type, |
|
&block->flow_block, tcf_block_shared(block), |
|
&extack); |
|
rtnl_lock(); |
|
down_write(&block->cb_lock); |
|
list_del(&block_cb->driver_list); |
|
list_move(&block_cb->list, &bo.cb_list); |
|
tcf_block_unbind(block, &bo); |
|
up_write(&block->cb_lock); |
|
rtnl_unlock(); |
|
} |
|
|
|
static bool tcf_block_offload_in_use(struct tcf_block *block) |
|
{ |
|
return atomic_read(&block->offloadcnt); |
|
} |
|
|
|
static int tcf_block_offload_cmd(struct tcf_block *block, |
|
struct net_device *dev, struct Qdisc *sch, |
|
struct tcf_block_ext_info *ei, |
|
enum flow_block_command command, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct flow_block_offload bo = {}; |
|
|
|
tcf_block_offload_init(&bo, dev, sch, command, ei->binder_type, |
|
&block->flow_block, tcf_block_shared(block), |
|
extack); |
|
|
|
if (dev->netdev_ops->ndo_setup_tc) { |
|
int err; |
|
|
|
err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); |
|
if (err < 0) { |
|
if (err != -EOPNOTSUPP) |
|
NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed"); |
|
return err; |
|
} |
|
|
|
return tcf_block_setup(block, &bo); |
|
} |
|
|
|
flow_indr_dev_setup_offload(dev, sch, TC_SETUP_BLOCK, block, &bo, |
|
tc_block_indr_cleanup); |
|
tcf_block_setup(block, &bo); |
|
|
|
return -EOPNOTSUPP; |
|
} |
|
|
|
static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
|
struct tcf_block_ext_info *ei, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net_device *dev = q->dev_queue->dev; |
|
int err; |
|
|
|
down_write(&block->cb_lock); |
|
|
|
/* If tc offload feature is disabled and the block we try to bind |
|
* to already has some offloaded filters, forbid to bind. |
|
*/ |
|
if (dev->netdev_ops->ndo_setup_tc && |
|
!tc_can_offload(dev) && |
|
tcf_block_offload_in_use(block)) { |
|
NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); |
|
err = -EOPNOTSUPP; |
|
goto err_unlock; |
|
} |
|
|
|
err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_BIND, extack); |
|
if (err == -EOPNOTSUPP) |
|
goto no_offload_dev_inc; |
|
if (err) |
|
goto err_unlock; |
|
|
|
up_write(&block->cb_lock); |
|
return 0; |
|
|
|
no_offload_dev_inc: |
|
if (tcf_block_offload_in_use(block)) |
|
goto err_unlock; |
|
|
|
err = 0; |
|
block->nooffloaddevcnt++; |
|
err_unlock: |
|
up_write(&block->cb_lock); |
|
return err; |
|
} |
|
|
|
static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, |
|
struct tcf_block_ext_info *ei) |
|
{ |
|
struct net_device *dev = q->dev_queue->dev; |
|
int err; |
|
|
|
down_write(&block->cb_lock); |
|
err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_UNBIND, NULL); |
|
if (err == -EOPNOTSUPP) |
|
goto no_offload_dev_dec; |
|
up_write(&block->cb_lock); |
|
return; |
|
|
|
no_offload_dev_dec: |
|
WARN_ON(block->nooffloaddevcnt-- == 0); |
|
up_write(&block->cb_lock); |
|
} |
|
|
|
static int |
|
tcf_chain0_head_change_cb_add(struct tcf_block *block, |
|
struct tcf_block_ext_info *ei, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_filter_chain_list_item *item; |
|
struct tcf_chain *chain0; |
|
|
|
item = kmalloc(sizeof(*item), GFP_KERNEL); |
|
if (!item) { |
|
NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); |
|
return -ENOMEM; |
|
} |
|
item->chain_head_change = ei->chain_head_change; |
|
item->chain_head_change_priv = ei->chain_head_change_priv; |
|
|
|
mutex_lock(&block->lock); |
|
chain0 = block->chain0.chain; |
|
if (chain0) |
|
tcf_chain_hold(chain0); |
|
else |
|
list_add(&item->list, &block->chain0.filter_chain_list); |
|
mutex_unlock(&block->lock); |
|
|
|
if (chain0) { |
|
struct tcf_proto *tp_head; |
|
|
|
mutex_lock(&chain0->filter_chain_lock); |
|
|
|
tp_head = tcf_chain_dereference(chain0->filter_chain, chain0); |
|
if (tp_head) |
|
tcf_chain_head_change_item(item, tp_head); |
|
|
|
mutex_lock(&block->lock); |
|
list_add(&item->list, &block->chain0.filter_chain_list); |
|
mutex_unlock(&block->lock); |
|
|
|
mutex_unlock(&chain0->filter_chain_lock); |
|
tcf_chain_put(chain0); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void |
|
tcf_chain0_head_change_cb_del(struct tcf_block *block, |
|
struct tcf_block_ext_info *ei) |
|
{ |
|
struct tcf_filter_chain_list_item *item; |
|
|
|
mutex_lock(&block->lock); |
|
list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
|
if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
|
(item->chain_head_change == ei->chain_head_change && |
|
item->chain_head_change_priv == ei->chain_head_change_priv)) { |
|
if (block->chain0.chain) |
|
tcf_chain_head_change_item(item, NULL); |
|
list_del(&item->list); |
|
mutex_unlock(&block->lock); |
|
|
|
kfree(item); |
|
return; |
|
} |
|
} |
|
mutex_unlock(&block->lock); |
|
WARN_ON(1); |
|
} |
|
|
|
struct tcf_net { |
|
spinlock_t idr_lock; /* Protects idr */ |
|
struct idr idr; |
|
}; |
|
|
|
static unsigned int tcf_net_id; |
|
|
|
static int tcf_block_insert(struct tcf_block *block, struct net *net, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_net *tn = net_generic(net, tcf_net_id); |
|
int err; |
|
|
|
idr_preload(GFP_KERNEL); |
|
spin_lock(&tn->idr_lock); |
|
err = idr_alloc_u32(&tn->idr, block, &block->index, block->index, |
|
GFP_NOWAIT); |
|
spin_unlock(&tn->idr_lock); |
|
idr_preload_end(); |
|
|
|
return err; |
|
} |
|
|
|
static void tcf_block_remove(struct tcf_block *block, struct net *net) |
|
{ |
|
struct tcf_net *tn = net_generic(net, tcf_net_id); |
|
|
|
spin_lock(&tn->idr_lock); |
|
idr_remove(&tn->idr, block->index); |
|
spin_unlock(&tn->idr_lock); |
|
} |
|
|
|
static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, |
|
u32 block_index, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_block *block; |
|
|
|
block = kzalloc(sizeof(*block), GFP_KERNEL); |
|
if (!block) { |
|
NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
mutex_init(&block->lock); |
|
mutex_init(&block->proto_destroy_lock); |
|
init_rwsem(&block->cb_lock); |
|
flow_block_init(&block->flow_block); |
|
INIT_LIST_HEAD(&block->chain_list); |
|
INIT_LIST_HEAD(&block->owner_list); |
|
INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
|
|
|
refcount_set(&block->refcnt, 1); |
|
block->net = net; |
|
block->index = block_index; |
|
|
|
/* Don't store q pointer for blocks which are shared */ |
|
if (!tcf_block_shared(block)) |
|
block->q = q; |
|
return block; |
|
} |
|
|
|
static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) |
|
{ |
|
struct tcf_net *tn = net_generic(net, tcf_net_id); |
|
|
|
return idr_find(&tn->idr, block_index); |
|
} |
|
|
|
static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index) |
|
{ |
|
struct tcf_block *block; |
|
|
|
rcu_read_lock(); |
|
block = tcf_block_lookup(net, block_index); |
|
if (block && !refcount_inc_not_zero(&block->refcnt)) |
|
block = NULL; |
|
rcu_read_unlock(); |
|
|
|
return block; |
|
} |
|
|
|
static struct tcf_chain * |
|
__tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) |
|
{ |
|
mutex_lock(&block->lock); |
|
if (chain) |
|
chain = list_is_last(&chain->list, &block->chain_list) ? |
|
NULL : list_next_entry(chain, list); |
|
else |
|
chain = list_first_entry_or_null(&block->chain_list, |
|
struct tcf_chain, list); |
|
|
|
/* skip all action-only chains */ |
|
while (chain && tcf_chain_held_by_acts_only(chain)) |
|
chain = list_is_last(&chain->list, &block->chain_list) ? |
|
NULL : list_next_entry(chain, list); |
|
|
|
if (chain) |
|
tcf_chain_hold(chain); |
|
mutex_unlock(&block->lock); |
|
|
|
return chain; |
|
} |
|
|
|
/* Function to be used by all clients that want to iterate over all chains on |
|
* block. It properly obtains block->lock and takes reference to chain before |
|
* returning it. Users of this function must be tolerant to concurrent chain |
|
* insertion/deletion or ensure that no concurrent chain modification is |
|
* possible. Note that all netlink dump callbacks cannot guarantee to provide |
|
* consistent dump because rtnl lock is released each time skb is filled with |
|
* data and sent to user-space. |
|
*/ |
|
|
|
struct tcf_chain * |
|
tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) |
|
{ |
|
struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain); |
|
|
|
if (chain) |
|
tcf_chain_put(chain); |
|
|
|
return chain_next; |
|
} |
|
EXPORT_SYMBOL(tcf_get_next_chain); |
|
|
|
static struct tcf_proto * |
|
__tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp) |
|
{ |
|
u32 prio = 0; |
|
|
|
ASSERT_RTNL(); |
|
mutex_lock(&chain->filter_chain_lock); |
|
|
|
if (!tp) { |
|
tp = tcf_chain_dereference(chain->filter_chain, chain); |
|
} else if (tcf_proto_is_deleting(tp)) { |
|
/* 'deleting' flag is set and chain->filter_chain_lock was |
|
* unlocked, which means next pointer could be invalid. Restart |
|
* search. |
|
*/ |
|
prio = tp->prio + 1; |
|
tp = tcf_chain_dereference(chain->filter_chain, chain); |
|
|
|
for (; tp; tp = tcf_chain_dereference(tp->next, chain)) |
|
if (!tp->deleting && tp->prio >= prio) |
|
break; |
|
} else { |
|
tp = tcf_chain_dereference(tp->next, chain); |
|
} |
|
|
|
if (tp) |
|
tcf_proto_get(tp); |
|
|
|
mutex_unlock(&chain->filter_chain_lock); |
|
|
|
return tp; |
|
} |
|
|
|
/* Function to be used by all clients that want to iterate over all tp's on |
|
* chain. Users of this function must be tolerant to concurrent tp |
|
* insertion/deletion or ensure that no concurrent chain modification is |
|
* possible. Note that all netlink dump callbacks cannot guarantee to provide |
|
* consistent dump because rtnl lock is released each time skb is filled with |
|
* data and sent to user-space. |
|
*/ |
|
|
|
struct tcf_proto * |
|
tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp) |
|
{ |
|
struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp); |
|
|
|
if (tp) |
|
tcf_proto_put(tp, true, NULL); |
|
|
|
return tp_next; |
|
} |
|
EXPORT_SYMBOL(tcf_get_next_proto); |
|
|
|
static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held) |
|
{ |
|
struct tcf_chain *chain; |
|
|
|
/* Last reference to block. At this point chains cannot be added or |
|
* removed concurrently. |
|
*/ |
|
for (chain = tcf_get_next_chain(block, NULL); |
|
chain; |
|
chain = tcf_get_next_chain(block, chain)) { |
|
tcf_chain_put_explicitly_created(chain); |
|
tcf_chain_flush(chain, rtnl_held); |
|
} |
|
} |
|
|
|
/* Lookup Qdisc and increments its reference counter. |
|
* Set parent, if necessary. |
|
*/ |
|
|
|
static int __tcf_qdisc_find(struct net *net, struct Qdisc **q, |
|
u32 *parent, int ifindex, bool rtnl_held, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
const struct Qdisc_class_ops *cops; |
|
struct net_device *dev; |
|
int err = 0; |
|
|
|
if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
|
return 0; |
|
|
|
rcu_read_lock(); |
|
|
|
/* Find link */ |
|
dev = dev_get_by_index_rcu(net, ifindex); |
|
if (!dev) { |
|
rcu_read_unlock(); |
|
return -ENODEV; |
|
} |
|
|
|
/* Find qdisc */ |
|
if (!*parent) { |
|
*q = dev->qdisc; |
|
*parent = (*q)->handle; |
|
} else { |
|
*q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent)); |
|
if (!*q) { |
|
NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); |
|
err = -EINVAL; |
|
goto errout_rcu; |
|
} |
|
} |
|
|
|
*q = qdisc_refcount_inc_nz(*q); |
|
if (!*q) { |
|
NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); |
|
err = -EINVAL; |
|
goto errout_rcu; |
|
} |
|
|
|
/* Is it classful? */ |
|
cops = (*q)->ops->cl_ops; |
|
if (!cops) { |
|
NL_SET_ERR_MSG(extack, "Qdisc not classful"); |
|
err = -EINVAL; |
|
goto errout_qdisc; |
|
} |
|
|
|
if (!cops->tcf_block) { |
|
NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); |
|
err = -EOPNOTSUPP; |
|
goto errout_qdisc; |
|
} |
|
|
|
errout_rcu: |
|
/* At this point we know that qdisc is not noop_qdisc, |
|
* which means that qdisc holds a reference to net_device |
|
* and we hold a reference to qdisc, so it is safe to release |
|
* rcu read lock. |
|
*/ |
|
rcu_read_unlock(); |
|
return err; |
|
|
|
errout_qdisc: |
|
rcu_read_unlock(); |
|
|
|
if (rtnl_held) |
|
qdisc_put(*q); |
|
else |
|
qdisc_put_unlocked(*q); |
|
*q = NULL; |
|
|
|
return err; |
|
} |
|
|
|
static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl, |
|
int ifindex, struct netlink_ext_ack *extack) |
|
{ |
|
if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
|
return 0; |
|
|
|
/* Do we search for filter, attached to class? */ |
|
if (TC_H_MIN(parent)) { |
|
const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
|
|
|
*cl = cops->find(q, parent); |
|
if (*cl == 0) { |
|
NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); |
|
return -ENOENT; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q, |
|
unsigned long cl, int ifindex, |
|
u32 block_index, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_block *block; |
|
|
|
if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
|
block = tcf_block_refcnt_get(net, block_index); |
|
if (!block) { |
|
NL_SET_ERR_MSG(extack, "Block of given index was not found"); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
} else { |
|
const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
|
|
|
block = cops->tcf_block(q, cl, extack); |
|
if (!block) |
|
return ERR_PTR(-EINVAL); |
|
|
|
if (tcf_block_shared(block)) { |
|
NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); |
|
return ERR_PTR(-EOPNOTSUPP); |
|
} |
|
|
|
/* Always take reference to block in order to support execution |
|
* of rules update path of cls API without rtnl lock. Caller |
|
* must release block when it is finished using it. 'if' block |
|
* of this conditional obtain reference to block by calling |
|
* tcf_block_refcnt_get(). |
|
*/ |
|
refcount_inc(&block->refcnt); |
|
} |
|
|
|
return block; |
|
} |
|
|
|
static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q, |
|
struct tcf_block_ext_info *ei, bool rtnl_held) |
|
{ |
|
if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) { |
|
/* Flushing/putting all chains will cause the block to be |
|
* deallocated when last chain is freed. However, if chain_list |
|
* is empty, block has to be manually deallocated. After block |
|
* reference counter reached 0, it is no longer possible to |
|
* increment it or add new chains to block. |
|
*/ |
|
bool free_block = list_empty(&block->chain_list); |
|
|
|
mutex_unlock(&block->lock); |
|
if (tcf_block_shared(block)) |
|
tcf_block_remove(block, block->net); |
|
|
|
if (q) |
|
tcf_block_offload_unbind(block, q, ei); |
|
|
|
if (free_block) |
|
tcf_block_destroy(block); |
|
else |
|
tcf_block_flush_all_chains(block, rtnl_held); |
|
} else if (q) { |
|
tcf_block_offload_unbind(block, q, ei); |
|
} |
|
} |
|
|
|
static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held) |
|
{ |
|
__tcf_block_put(block, NULL, NULL, rtnl_held); |
|
} |
|
|
|
/* Find tcf block. |
|
* Set q, parent, cl when appropriate. |
|
*/ |
|
|
|
static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, |
|
u32 *parent, unsigned long *cl, |
|
int ifindex, u32 block_index, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_block *block; |
|
int err = 0; |
|
|
|
ASSERT_RTNL(); |
|
|
|
err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack); |
|
if (err) |
|
goto errout; |
|
|
|
err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack); |
|
if (err) |
|
goto errout_qdisc; |
|
|
|
block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack); |
|
if (IS_ERR(block)) { |
|
err = PTR_ERR(block); |
|
goto errout_qdisc; |
|
} |
|
|
|
return block; |
|
|
|
errout_qdisc: |
|
if (*q) |
|
qdisc_put(*q); |
|
errout: |
|
*q = NULL; |
|
return ERR_PTR(err); |
|
} |
|
|
|
static void tcf_block_release(struct Qdisc *q, struct tcf_block *block, |
|
bool rtnl_held) |
|
{ |
|
if (!IS_ERR_OR_NULL(block)) |
|
tcf_block_refcnt_put(block, rtnl_held); |
|
|
|
if (q) { |
|
if (rtnl_held) |
|
qdisc_put(q); |
|
else |
|
qdisc_put_unlocked(q); |
|
} |
|
} |
|
|
|
struct tcf_block_owner_item { |
|
struct list_head list; |
|
struct Qdisc *q; |
|
enum flow_block_binder_type binder_type; |
|
}; |
|
|
|
static void |
|
tcf_block_owner_netif_keep_dst(struct tcf_block *block, |
|
struct Qdisc *q, |
|
enum flow_block_binder_type binder_type) |
|
{ |
|
if (block->keep_dst && |
|
binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS && |
|
binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS) |
|
netif_keep_dst(qdisc_dev(q)); |
|
} |
|
|
|
void tcf_block_netif_keep_dst(struct tcf_block *block) |
|
{ |
|
struct tcf_block_owner_item *item; |
|
|
|
block->keep_dst = true; |
|
list_for_each_entry(item, &block->owner_list, list) |
|
tcf_block_owner_netif_keep_dst(block, item->q, |
|
item->binder_type); |
|
} |
|
EXPORT_SYMBOL(tcf_block_netif_keep_dst); |
|
|
|
static int tcf_block_owner_add(struct tcf_block *block, |
|
struct Qdisc *q, |
|
enum flow_block_binder_type binder_type) |
|
{ |
|
struct tcf_block_owner_item *item; |
|
|
|
item = kmalloc(sizeof(*item), GFP_KERNEL); |
|
if (!item) |
|
return -ENOMEM; |
|
item->q = q; |
|
item->binder_type = binder_type; |
|
list_add(&item->list, &block->owner_list); |
|
return 0; |
|
} |
|
|
|
static void tcf_block_owner_del(struct tcf_block *block, |
|
struct Qdisc *q, |
|
enum flow_block_binder_type binder_type) |
|
{ |
|
struct tcf_block_owner_item *item; |
|
|
|
list_for_each_entry(item, &block->owner_list, list) { |
|
if (item->q == q && item->binder_type == binder_type) { |
|
list_del(&item->list); |
|
kfree(item); |
|
return; |
|
} |
|
} |
|
WARN_ON(1); |
|
} |
|
|
|
int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
|
struct tcf_block_ext_info *ei, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = qdisc_net(q); |
|
struct tcf_block *block = NULL; |
|
int err; |
|
|
|
if (ei->block_index) |
|
/* block_index not 0 means the shared block is requested */ |
|
block = tcf_block_refcnt_get(net, ei->block_index); |
|
|
|
if (!block) { |
|
block = tcf_block_create(net, q, ei->block_index, extack); |
|
if (IS_ERR(block)) |
|
return PTR_ERR(block); |
|
if (tcf_block_shared(block)) { |
|
err = tcf_block_insert(block, net, extack); |
|
if (err) |
|
goto err_block_insert; |
|
} |
|
} |
|
|
|
err = tcf_block_owner_add(block, q, ei->binder_type); |
|
if (err) |
|
goto err_block_owner_add; |
|
|
|
tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); |
|
|
|
err = tcf_chain0_head_change_cb_add(block, ei, extack); |
|
if (err) |
|
goto err_chain0_head_change_cb_add; |
|
|
|
err = tcf_block_offload_bind(block, q, ei, extack); |
|
if (err) |
|
goto err_block_offload_bind; |
|
|
|
*p_block = block; |
|
return 0; |
|
|
|
err_block_offload_bind: |
|
tcf_chain0_head_change_cb_del(block, ei); |
|
err_chain0_head_change_cb_add: |
|
tcf_block_owner_del(block, q, ei->binder_type); |
|
err_block_owner_add: |
|
err_block_insert: |
|
tcf_block_refcnt_put(block, true); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(tcf_block_get_ext); |
|
|
|
static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
|
{ |
|
struct tcf_proto __rcu **p_filter_chain = priv; |
|
|
|
rcu_assign_pointer(*p_filter_chain, tp_head); |
|
} |
|
|
|
int tcf_block_get(struct tcf_block **p_block, |
|
struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_block_ext_info ei = { |
|
.chain_head_change = tcf_chain_head_change_dflt, |
|
.chain_head_change_priv = p_filter_chain, |
|
}; |
|
|
|
WARN_ON(!p_filter_chain); |
|
return tcf_block_get_ext(p_block, q, &ei, extack); |
|
} |
|
EXPORT_SYMBOL(tcf_block_get); |
|
|
|
/* XXX: Standalone actions are not allowed to jump to any chain, and bound |
|
* actions should be all removed after flushing. |
|
*/ |
|
void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
|
struct tcf_block_ext_info *ei) |
|
{ |
|
if (!block) |
|
return; |
|
tcf_chain0_head_change_cb_del(block, ei); |
|
tcf_block_owner_del(block, q, ei->binder_type); |
|
|
|
__tcf_block_put(block, q, ei, true); |
|
} |
|
EXPORT_SYMBOL(tcf_block_put_ext); |
|
|
|
void tcf_block_put(struct tcf_block *block) |
|
{ |
|
struct tcf_block_ext_info ei = {0, }; |
|
|
|
if (!block) |
|
return; |
|
tcf_block_put_ext(block, block->q, &ei); |
|
} |
|
|
|
EXPORT_SYMBOL(tcf_block_put); |
|
|
|
static int |
|
tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb, |
|
void *cb_priv, bool add, bool offload_in_use, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_chain *chain, *chain_prev; |
|
struct tcf_proto *tp, *tp_prev; |
|
int err; |
|
|
|
lockdep_assert_held(&block->cb_lock); |
|
|
|
for (chain = __tcf_get_next_chain(block, NULL); |
|
chain; |
|
chain_prev = chain, |
|
chain = __tcf_get_next_chain(block, chain), |
|
tcf_chain_put(chain_prev)) { |
|
for (tp = __tcf_get_next_proto(chain, NULL); tp; |
|
tp_prev = tp, |
|
tp = __tcf_get_next_proto(chain, tp), |
|
tcf_proto_put(tp_prev, true, NULL)) { |
|
if (tp->ops->reoffload) { |
|
err = tp->ops->reoffload(tp, add, cb, cb_priv, |
|
extack); |
|
if (err && add) |
|
goto err_playback_remove; |
|
} else if (add && offload_in_use) { |
|
err = -EOPNOTSUPP; |
|
NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); |
|
goto err_playback_remove; |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
err_playback_remove: |
|
tcf_proto_put(tp, true, NULL); |
|
tcf_chain_put(chain); |
|
tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, |
|
extack); |
|
return err; |
|
} |
|
|
|
static int tcf_block_bind(struct tcf_block *block, |
|
struct flow_block_offload *bo) |
|
{ |
|
struct flow_block_cb *block_cb, *next; |
|
int err, i = 0; |
|
|
|
lockdep_assert_held(&block->cb_lock); |
|
|
|
list_for_each_entry(block_cb, &bo->cb_list, list) { |
|
err = tcf_block_playback_offloads(block, block_cb->cb, |
|
block_cb->cb_priv, true, |
|
tcf_block_offload_in_use(block), |
|
bo->extack); |
|
if (err) |
|
goto err_unroll; |
|
if (!bo->unlocked_driver_cb) |
|
block->lockeddevcnt++; |
|
|
|
i++; |
|
} |
|
list_splice(&bo->cb_list, &block->flow_block.cb_list); |
|
|
|
return 0; |
|
|
|
err_unroll: |
|
list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { |
|
if (i-- > 0) { |
|
list_del(&block_cb->list); |
|
tcf_block_playback_offloads(block, block_cb->cb, |
|
block_cb->cb_priv, false, |
|
tcf_block_offload_in_use(block), |
|
NULL); |
|
if (!bo->unlocked_driver_cb) |
|
block->lockeddevcnt--; |
|
} |
|
flow_block_cb_free(block_cb); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static void tcf_block_unbind(struct tcf_block *block, |
|
struct flow_block_offload *bo) |
|
{ |
|
struct flow_block_cb *block_cb, *next; |
|
|
|
lockdep_assert_held(&block->cb_lock); |
|
|
|
list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { |
|
tcf_block_playback_offloads(block, block_cb->cb, |
|
block_cb->cb_priv, false, |
|
tcf_block_offload_in_use(block), |
|
NULL); |
|
list_del(&block_cb->list); |
|
flow_block_cb_free(block_cb); |
|
if (!bo->unlocked_driver_cb) |
|
block->lockeddevcnt--; |
|
} |
|
} |
|
|
|
static int tcf_block_setup(struct tcf_block *block, |
|
struct flow_block_offload *bo) |
|
{ |
|
int err; |
|
|
|
switch (bo->command) { |
|
case FLOW_BLOCK_BIND: |
|
err = tcf_block_bind(block, bo); |
|
break; |
|
case FLOW_BLOCK_UNBIND: |
|
err = 0; |
|
tcf_block_unbind(block, bo); |
|
break; |
|
default: |
|
WARN_ON_ONCE(1); |
|
err = -EOPNOTSUPP; |
|
} |
|
|
|
return err; |
|
} |
|
|
|
/* Main classifier routine: scans classifier chain attached |
|
* to this qdisc, (optionally) tests for protocol and asks |
|
* specific classifiers. |
|
*/ |
|
static inline int __tcf_classify(struct sk_buff *skb, |
|
const struct tcf_proto *tp, |
|
const struct tcf_proto *orig_tp, |
|
struct tcf_result *res, |
|
bool compat_mode, |
|
u32 *last_executed_chain) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
const int max_reclassify_loop = 16; |
|
const struct tcf_proto *first_tp; |
|
int limit = 0; |
|
|
|
reclassify: |
|
#endif |
|
for (; tp; tp = rcu_dereference_bh(tp->next)) { |
|
__be16 protocol = skb_protocol(skb, false); |
|
int err; |
|
|
|
if (tp->protocol != protocol && |
|
tp->protocol != htons(ETH_P_ALL)) |
|
continue; |
|
|
|
err = tp->classify(skb, tp, res); |
|
#ifdef CONFIG_NET_CLS_ACT |
|
if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
|
first_tp = orig_tp; |
|
*last_executed_chain = first_tp->chain->index; |
|
goto reset; |
|
} else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
|
first_tp = res->goto_tp; |
|
*last_executed_chain = err & TC_ACT_EXT_VAL_MASK; |
|
goto reset; |
|
} |
|
#endif |
|
if (err >= 0) |
|
return err; |
|
} |
|
|
|
return TC_ACT_UNSPEC; /* signal: continue lookup */ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
reset: |
|
if (unlikely(limit++ >= max_reclassify_loop)) { |
|
net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
|
tp->chain->block->index, |
|
tp->prio & 0xffff, |
|
ntohs(tp->protocol)); |
|
return TC_ACT_SHOT; |
|
} |
|
|
|
tp = first_tp; |
|
goto reclassify; |
|
#endif |
|
} |
|
|
|
int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
|
struct tcf_result *res, bool compat_mode) |
|
{ |
|
u32 last_executed_chain = 0; |
|
|
|
return __tcf_classify(skb, tp, tp, res, compat_mode, |
|
&last_executed_chain); |
|
} |
|
EXPORT_SYMBOL(tcf_classify); |
|
|
|
int tcf_classify_ingress(struct sk_buff *skb, |
|
const struct tcf_block *ingress_block, |
|
const struct tcf_proto *tp, |
|
struct tcf_result *res, bool compat_mode) |
|
{ |
|
#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) |
|
u32 last_executed_chain = 0; |
|
|
|
return __tcf_classify(skb, tp, tp, res, compat_mode, |
|
&last_executed_chain); |
|
#else |
|
u32 last_executed_chain = tp ? tp->chain->index : 0; |
|
const struct tcf_proto *orig_tp = tp; |
|
struct tc_skb_ext *ext; |
|
int ret; |
|
|
|
ext = skb_ext_find(skb, TC_SKB_EXT); |
|
|
|
if (ext && ext->chain) { |
|
struct tcf_chain *fchain; |
|
|
|
fchain = tcf_chain_lookup_rcu(ingress_block, ext->chain); |
|
if (!fchain) |
|
return TC_ACT_SHOT; |
|
|
|
/* Consume, so cloned/redirect skbs won't inherit ext */ |
|
skb_ext_del(skb, TC_SKB_EXT); |
|
|
|
tp = rcu_dereference_bh(fchain->filter_chain); |
|
last_executed_chain = fchain->index; |
|
} |
|
|
|
ret = __tcf_classify(skb, tp, orig_tp, res, compat_mode, |
|
&last_executed_chain); |
|
|
|
/* If we missed on some chain */ |
|
if (ret == TC_ACT_UNSPEC && last_executed_chain) { |
|
ext = tc_skb_ext_alloc(skb); |
|
if (WARN_ON_ONCE(!ext)) |
|
return TC_ACT_SHOT; |
|
ext->chain = last_executed_chain; |
|
ext->mru = qdisc_skb_cb(skb)->mru; |
|
ext->post_ct = qdisc_skb_cb(skb)->post_ct; |
|
} |
|
|
|
return ret; |
|
#endif |
|
} |
|
EXPORT_SYMBOL(tcf_classify_ingress); |
|
|
|
struct tcf_chain_info { |
|
struct tcf_proto __rcu **pprev; |
|
struct tcf_proto __rcu *next; |
|
}; |
|
|
|
static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain, |
|
struct tcf_chain_info *chain_info) |
|
{ |
|
return tcf_chain_dereference(*chain_info->pprev, chain); |
|
} |
|
|
|
static int tcf_chain_tp_insert(struct tcf_chain *chain, |
|
struct tcf_chain_info *chain_info, |
|
struct tcf_proto *tp) |
|
{ |
|
if (chain->flushing) |
|
return -EAGAIN; |
|
|
|
if (*chain_info->pprev == chain->filter_chain) |
|
tcf_chain0_head_change(chain, tp); |
|
tcf_proto_get(tp); |
|
RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info)); |
|
rcu_assign_pointer(*chain_info->pprev, tp); |
|
|
|
return 0; |
|
} |
|
|
|
static void tcf_chain_tp_remove(struct tcf_chain *chain, |
|
struct tcf_chain_info *chain_info, |
|
struct tcf_proto *tp) |
|
{ |
|
struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain); |
|
|
|
tcf_proto_mark_delete(tp); |
|
if (tp == chain->filter_chain) |
|
tcf_chain0_head_change(chain, next); |
|
RCU_INIT_POINTER(*chain_info->pprev, next); |
|
} |
|
|
|
static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
|
struct tcf_chain_info *chain_info, |
|
u32 protocol, u32 prio, |
|
bool prio_allocate); |
|
|
|
/* Try to insert new proto. |
|
* If proto with specified priority already exists, free new proto |
|
* and return existing one. |
|
*/ |
|
|
|
static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain, |
|
struct tcf_proto *tp_new, |
|
u32 protocol, u32 prio, |
|
bool rtnl_held) |
|
{ |
|
struct tcf_chain_info chain_info; |
|
struct tcf_proto *tp; |
|
int err = 0; |
|
|
|
mutex_lock(&chain->filter_chain_lock); |
|
|
|
if (tcf_proto_exists_destroying(chain, tp_new)) { |
|
mutex_unlock(&chain->filter_chain_lock); |
|
tcf_proto_destroy(tp_new, rtnl_held, false, NULL); |
|
return ERR_PTR(-EAGAIN); |
|
} |
|
|
|
tp = tcf_chain_tp_find(chain, &chain_info, |
|
protocol, prio, false); |
|
if (!tp) |
|
err = tcf_chain_tp_insert(chain, &chain_info, tp_new); |
|
mutex_unlock(&chain->filter_chain_lock); |
|
|
|
if (tp) { |
|
tcf_proto_destroy(tp_new, rtnl_held, false, NULL); |
|
tp_new = tp; |
|
} else if (err) { |
|
tcf_proto_destroy(tp_new, rtnl_held, false, NULL); |
|
tp_new = ERR_PTR(err); |
|
} |
|
|
|
return tp_new; |
|
} |
|
|
|
static void tcf_chain_tp_delete_empty(struct tcf_chain *chain, |
|
struct tcf_proto *tp, bool rtnl_held, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tcf_chain_info chain_info; |
|
struct tcf_proto *tp_iter; |
|
struct tcf_proto **pprev; |
|
struct tcf_proto *next; |
|
|
|
mutex_lock(&chain->filter_chain_lock); |
|
|
|
/* Atomically find and remove tp from chain. */ |
|
for (pprev = &chain->filter_chain; |
|
(tp_iter = tcf_chain_dereference(*pprev, chain)); |
|
pprev = &tp_iter->next) { |
|
if (tp_iter == tp) { |
|
chain_info.pprev = pprev; |
|
chain_info.next = tp_iter->next; |
|
WARN_ON(tp_iter->deleting); |
|
break; |
|
} |
|
} |
|
/* Verify that tp still exists and no new filters were inserted |
|
* concurrently. |
|
* Mark tp for deletion if it is empty. |
|
*/ |
|
if (!tp_iter || !tcf_proto_check_delete(tp)) { |
|
mutex_unlock(&chain->filter_chain_lock); |
|
return; |
|
} |
|
|
|
tcf_proto_signal_destroying(chain, tp); |
|
next = tcf_chain_dereference(chain_info.next, chain); |
|
if (tp == chain->filter_chain) |
|
tcf_chain0_head_change(chain, next); |
|
RCU_INIT_POINTER(*chain_info.pprev, next); |
|
mutex_unlock(&chain->filter_chain_lock); |
|
|
|
tcf_proto_put(tp, rtnl_held, extack); |
|
} |
|
|
|
static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
|
struct tcf_chain_info *chain_info, |
|
u32 protocol, u32 prio, |
|
bool prio_allocate) |
|
{ |
|
struct tcf_proto **pprev; |
|
struct tcf_proto *tp; |
|
|
|
/* Check the chain for existence of proto-tcf with this priority */ |
|
for (pprev = &chain->filter_chain; |
|
(tp = tcf_chain_dereference(*pprev, chain)); |
|
pprev = &tp->next) { |
|
if (tp->prio >= prio) { |
|
if (tp->prio == prio) { |
|
if (prio_allocate || |
|
(tp->protocol != protocol && protocol)) |
|
return ERR_PTR(-EINVAL); |
|
} else { |
|
tp = NULL; |
|
} |
|
break; |
|
} |
|
} |
|
chain_info->pprev = pprev; |
|
if (tp) { |
|
chain_info->next = tp->next; |
|
tcf_proto_get(tp); |
|
} else { |
|
chain_info->next = NULL; |
|
} |
|
return tp; |
|
} |
|
|
|
static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
|
struct tcf_proto *tp, struct tcf_block *block, |
|
struct Qdisc *q, u32 parent, void *fh, |
|
u32 portid, u32 seq, u16 flags, int event, |
|
bool terse_dump, bool rtnl_held) |
|
{ |
|
struct tcmsg *tcm; |
|
struct nlmsghdr *nlh; |
|
unsigned char *b = skb_tail_pointer(skb); |
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
|
if (!nlh) |
|
goto out_nlmsg_trim; |
|
tcm = nlmsg_data(nlh); |
|
tcm->tcm_family = AF_UNSPEC; |
|
tcm->tcm__pad1 = 0; |
|
tcm->tcm__pad2 = 0; |
|
if (q) { |
|
tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
|
tcm->tcm_parent = parent; |
|
} else { |
|
tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; |
|
tcm->tcm_block_index = block->index; |
|
} |
|
tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
|
if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) |
|
goto nla_put_failure; |
|
if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) |
|
goto nla_put_failure; |
|
if (!fh) { |
|
tcm->tcm_handle = 0; |
|
} else if (terse_dump) { |
|
if (tp->ops->terse_dump) { |
|
if (tp->ops->terse_dump(net, tp, fh, skb, tcm, |
|
rtnl_held) < 0) |
|
goto nla_put_failure; |
|
} else { |
|
goto cls_op_not_supp; |
|
} |
|
} else { |
|
if (tp->ops->dump && |
|
tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0) |
|
goto nla_put_failure; |
|
} |
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
|
return skb->len; |
|
|
|
out_nlmsg_trim: |
|
nla_put_failure: |
|
cls_op_not_supp: |
|
nlmsg_trim(skb, b); |
|
return -1; |
|
} |
|
|
|
static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
|
struct nlmsghdr *n, struct tcf_proto *tp, |
|
struct tcf_block *block, struct Qdisc *q, |
|
u32 parent, void *fh, int event, bool unicast, |
|
bool rtnl_held) |
|
{ |
|
struct sk_buff *skb; |
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
|
int err = 0; |
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
|
if (!skb) |
|
return -ENOBUFS; |
|
|
|
if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
|
n->nlmsg_seq, n->nlmsg_flags, event, |
|
false, rtnl_held) <= 0) { |
|
kfree_skb(skb); |
|
return -EINVAL; |
|
} |
|
|
|
if (unicast) |
|
err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
|
else |
|
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
|
n->nlmsg_flags & NLM_F_ECHO); |
|
|
|
if (err > 0) |
|
err = 0; |
|
return err; |
|
} |
|
|
|
static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, |
|
struct nlmsghdr *n, struct tcf_proto *tp, |
|
struct tcf_block *block, struct Qdisc *q, |
|
u32 parent, void *fh, bool unicast, bool *last, |
|
bool rtnl_held, struct netlink_ext_ack *extack) |
|
{ |
|
struct sk_buff *skb; |
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
|
int err; |
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
|
if (!skb) |
|
return -ENOBUFS; |
|
|
|
if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
|
n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER, |
|
false, rtnl_held) <= 0) { |
|
NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
|
kfree_skb(skb); |
|
return -EINVAL; |
|
} |
|
|
|
err = tp->ops->delete(tp, fh, last, rtnl_held, extack); |
|
if (err) { |
|
kfree_skb(skb); |
|
return err; |
|
} |
|
|
|
if (unicast) |
|
err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
|
else |
|
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
|
n->nlmsg_flags & NLM_F_ECHO); |
|
if (err < 0) |
|
NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); |
|
|
|
if (err > 0) |
|
err = 0; |
|
return err; |
|
} |
|
|
|
static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, |
|
struct tcf_block *block, struct Qdisc *q, |
|
u32 parent, struct nlmsghdr *n, |
|
struct tcf_chain *chain, int event) |
|
{ |
|
struct tcf_proto *tp; |
|
|
|
for (tp = tcf_get_next_proto(chain, NULL); |
|
tp; tp = tcf_get_next_proto(chain, tp)) |
|
tfilter_notify(net, oskb, n, tp, block, |
|
q, parent, NULL, event, false, true); |
|
} |
|
|
|
static void tfilter_put(struct tcf_proto *tp, void *fh) |
|
{ |
|
if (tp->ops->put && fh) |
|
tp->ops->put(tp, fh); |
|
} |
|
|
|
static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tca[TCA_MAX + 1]; |
|
char name[IFNAMSIZ]; |
|
struct tcmsg *t; |
|
u32 protocol; |
|
u32 prio; |
|
bool prio_allocate; |
|
u32 parent; |
|
u32 chain_index; |
|
struct Qdisc *q = NULL; |
|
struct tcf_chain_info chain_info; |
|
struct tcf_chain *chain = NULL; |
|
struct tcf_block *block; |
|
struct tcf_proto *tp; |
|
unsigned long cl; |
|
void *fh; |
|
int err; |
|
int tp_created; |
|
bool rtnl_held = false; |
|
|
|
if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
replay: |
|
tp_created = 0; |
|
|
|
err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
|
rtm_tca_policy, extack); |
|
if (err < 0) |
|
return err; |
|
|
|
t = nlmsg_data(n); |
|
protocol = TC_H_MIN(t->tcm_info); |
|
prio = TC_H_MAJ(t->tcm_info); |
|
prio_allocate = false; |
|
parent = t->tcm_parent; |
|
tp = NULL; |
|
cl = 0; |
|
block = NULL; |
|
|
|
if (prio == 0) { |
|
/* If no priority is provided by the user, |
|
* we allocate one. |
|
*/ |
|
if (n->nlmsg_flags & NLM_F_CREATE) { |
|
prio = TC_H_MAKE(0x80000000U, 0U); |
|
prio_allocate = true; |
|
} else { |
|
NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
|
return -ENOENT; |
|
} |
|
} |
|
|
|
/* Find head of filter chain. */ |
|
|
|
err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
|
if (err) |
|
return err; |
|
|
|
if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
|
NL_SET_ERR_MSG(extack, "Specified TC filter name too long"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
|
|
/* Take rtnl mutex if rtnl_held was set to true on previous iteration, |
|
* block is shared (no qdisc found), qdisc is not unlocked, classifier |
|
* type is not specified, classifier is not unlocked. |
|
*/ |
|
if (rtnl_held || |
|
(q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || |
|
!tcf_proto_is_unlocked(name)) { |
|
rtnl_held = true; |
|
rtnl_lock(); |
|
} |
|
|
|
err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); |
|
if (err) |
|
goto errout; |
|
|
|
block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, |
|
extack); |
|
if (IS_ERR(block)) { |
|
err = PTR_ERR(block); |
|
goto errout; |
|
} |
|
block->classid = parent; |
|
|
|
chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; |
|
if (chain_index > TC_ACT_EXT_VAL_MASK) { |
|
NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
chain = tcf_chain_get(block, chain_index, true); |
|
if (!chain) { |
|
NL_SET_ERR_MSG(extack, "Cannot create specified filter chain"); |
|
err = -ENOMEM; |
|
goto errout; |
|
} |
|
|
|
mutex_lock(&chain->filter_chain_lock); |
|
tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
|
prio, prio_allocate); |
|
if (IS_ERR(tp)) { |
|
NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
|
err = PTR_ERR(tp); |
|
goto errout_locked; |
|
} |
|
|
|
if (tp == NULL) { |
|
struct tcf_proto *tp_new = NULL; |
|
|
|
if (chain->flushing) { |
|
err = -EAGAIN; |
|
goto errout_locked; |
|
} |
|
|
|
/* Proto-tcf does not exist, create new one */ |
|
|
|
if (tca[TCA_KIND] == NULL || !protocol) { |
|
NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
|
err = -EINVAL; |
|
goto errout_locked; |
|
} |
|
|
|
if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
|
NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
|
err = -ENOENT; |
|
goto errout_locked; |
|
} |
|
|
|
if (prio_allocate) |
|
prio = tcf_auto_prio(tcf_chain_tp_prev(chain, |
|
&chain_info)); |
|
|
|
mutex_unlock(&chain->filter_chain_lock); |
|
tp_new = tcf_proto_create(name, protocol, prio, chain, |
|
rtnl_held, extack); |
|
if (IS_ERR(tp_new)) { |
|
err = PTR_ERR(tp_new); |
|
goto errout_tp; |
|
} |
|
|
|
tp_created = 1; |
|
tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio, |
|
rtnl_held); |
|
if (IS_ERR(tp)) { |
|
err = PTR_ERR(tp); |
|
goto errout_tp; |
|
} |
|
} else { |
|
mutex_unlock(&chain->filter_chain_lock); |
|
} |
|
|
|
if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
|
NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
|
|
fh = tp->ops->get(tp, t->tcm_handle); |
|
|
|
if (!fh) { |
|
if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
|
NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
|
err = -ENOENT; |
|
goto errout; |
|
} |
|
} else if (n->nlmsg_flags & NLM_F_EXCL) { |
|
tfilter_put(tp, fh); |
|
NL_SET_ERR_MSG(extack, "Filter already exists"); |
|
err = -EEXIST; |
|
goto errout; |
|
} |
|
|
|
if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { |
|
NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
|
|
err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
|
n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
|
rtnl_held, extack); |
|
if (err == 0) { |
|
tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
|
RTM_NEWTFILTER, false, rtnl_held); |
|
tfilter_put(tp, fh); |
|
/* q pointer is NULL for shared blocks */ |
|
if (q) |
|
q->flags &= ~TCQ_F_CAN_BYPASS; |
|
} |
|
|
|
errout: |
|
if (err && tp_created) |
|
tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL); |
|
errout_tp: |
|
if (chain) { |
|
if (tp && !IS_ERR(tp)) |
|
tcf_proto_put(tp, rtnl_held, NULL); |
|
if (!tp_created) |
|
tcf_chain_put(chain); |
|
} |
|
tcf_block_release(q, block, rtnl_held); |
|
|
|
if (rtnl_held) |
|
rtnl_unlock(); |
|
|
|
if (err == -EAGAIN) { |
|
/* Take rtnl lock in case EAGAIN is caused by concurrent flush |
|
* of target chain. |
|
*/ |
|
rtnl_held = true; |
|
/* Replay the request. */ |
|
goto replay; |
|
} |
|
return err; |
|
|
|
errout_locked: |
|
mutex_unlock(&chain->filter_chain_lock); |
|
goto errout; |
|
} |
|
|
|
static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tca[TCA_MAX + 1]; |
|
char name[IFNAMSIZ]; |
|
struct tcmsg *t; |
|
u32 protocol; |
|
u32 prio; |
|
u32 parent; |
|
u32 chain_index; |
|
struct Qdisc *q = NULL; |
|
struct tcf_chain_info chain_info; |
|
struct tcf_chain *chain = NULL; |
|
struct tcf_block *block = NULL; |
|
struct tcf_proto *tp = NULL; |
|
unsigned long cl = 0; |
|
void *fh = NULL; |
|
int err; |
|
bool rtnl_held = false; |
|
|
|
if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
|
rtm_tca_policy, extack); |
|
if (err < 0) |
|
return err; |
|
|
|
t = nlmsg_data(n); |
|
protocol = TC_H_MIN(t->tcm_info); |
|
prio = TC_H_MAJ(t->tcm_info); |
|
parent = t->tcm_parent; |
|
|
|
if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { |
|
NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); |
|
return -ENOENT; |
|
} |
|
|
|
/* Find head of filter chain. */ |
|
|
|
err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
|
if (err) |
|
return err; |
|
|
|
if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
|
NL_SET_ERR_MSG(extack, "Specified TC filter name too long"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
/* Take rtnl mutex if flushing whole chain, block is shared (no qdisc |
|
* found), qdisc is not unlocked, classifier type is not specified, |
|
* classifier is not unlocked. |
|
*/ |
|
if (!prio || |
|
(q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || |
|
!tcf_proto_is_unlocked(name)) { |
|
rtnl_held = true; |
|
rtnl_lock(); |
|
} |
|
|
|
err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); |
|
if (err) |
|
goto errout; |
|
|
|
block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, |
|
extack); |
|
if (IS_ERR(block)) { |
|
err = PTR_ERR(block); |
|
goto errout; |
|
} |
|
|
|
chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; |
|
if (chain_index > TC_ACT_EXT_VAL_MASK) { |
|
NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
chain = tcf_chain_get(block, chain_index, false); |
|
if (!chain) { |
|
/* User requested flush on non-existent chain. Nothing to do, |
|
* so just return success. |
|
*/ |
|
if (prio == 0) { |
|
err = 0; |
|
goto errout; |
|
} |
|
NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
|
err = -ENOENT; |
|
goto errout; |
|
} |
|
|
|
if (prio == 0) { |
|
tfilter_notify_chain(net, skb, block, q, parent, n, |
|
chain, RTM_DELTFILTER); |
|
tcf_chain_flush(chain, rtnl_held); |
|
err = 0; |
|
goto errout; |
|
} |
|
|
|
mutex_lock(&chain->filter_chain_lock); |
|
tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
|
prio, false); |
|
if (!tp || IS_ERR(tp)) { |
|
NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
|
err = tp ? PTR_ERR(tp) : -ENOENT; |
|
goto errout_locked; |
|
} else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
|
NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
|
err = -EINVAL; |
|
goto errout_locked; |
|
} else if (t->tcm_handle == 0) { |
|
tcf_proto_signal_destroying(chain, tp); |
|
tcf_chain_tp_remove(chain, &chain_info, tp); |
|
mutex_unlock(&chain->filter_chain_lock); |
|
|
|
tcf_proto_put(tp, rtnl_held, NULL); |
|
tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
|
RTM_DELTFILTER, false, rtnl_held); |
|
err = 0; |
|
goto errout; |
|
} |
|
mutex_unlock(&chain->filter_chain_lock); |
|
|
|
fh = tp->ops->get(tp, t->tcm_handle); |
|
|
|
if (!fh) { |
|
NL_SET_ERR_MSG(extack, "Specified filter handle not found"); |
|
err = -ENOENT; |
|
} else { |
|
bool last; |
|
|
|
err = tfilter_del_notify(net, skb, n, tp, block, |
|
q, parent, fh, false, &last, |
|
rtnl_held, extack); |
|
|
|
if (err) |
|
goto errout; |
|
if (last) |
|
tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack); |
|
} |
|
|
|
errout: |
|
if (chain) { |
|
if (tp && !IS_ERR(tp)) |
|
tcf_proto_put(tp, rtnl_held, NULL); |
|
tcf_chain_put(chain); |
|
} |
|
tcf_block_release(q, block, rtnl_held); |
|
|
|
if (rtnl_held) |
|
rtnl_unlock(); |
|
|
|
return err; |
|
|
|
errout_locked: |
|
mutex_unlock(&chain->filter_chain_lock); |
|
goto errout; |
|
} |
|
|
|
static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tca[TCA_MAX + 1]; |
|
char name[IFNAMSIZ]; |
|
struct tcmsg *t; |
|
u32 protocol; |
|
u32 prio; |
|
u32 parent; |
|
u32 chain_index; |
|
struct Qdisc *q = NULL; |
|
struct tcf_chain_info chain_info; |
|
struct tcf_chain *chain = NULL; |
|
struct tcf_block *block = NULL; |
|
struct tcf_proto *tp = NULL; |
|
unsigned long cl = 0; |
|
void *fh = NULL; |
|
int err; |
|
bool rtnl_held = false; |
|
|
|
err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
|
rtm_tca_policy, extack); |
|
if (err < 0) |
|
return err; |
|
|
|
t = nlmsg_data(n); |
|
protocol = TC_H_MIN(t->tcm_info); |
|
prio = TC_H_MAJ(t->tcm_info); |
|
parent = t->tcm_parent; |
|
|
|
if (prio == 0) { |
|
NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
|
return -ENOENT; |
|
} |
|
|
|
/* Find head of filter chain. */ |
|
|
|
err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
|
if (err) |
|
return err; |
|
|
|
if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
|
NL_SET_ERR_MSG(extack, "Specified TC filter name too long"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
/* Take rtnl mutex if block is shared (no qdisc found), qdisc is not |
|
* unlocked, classifier type is not specified, classifier is not |
|
* unlocked. |
|
*/ |
|
if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || |
|
!tcf_proto_is_unlocked(name)) { |
|
rtnl_held = true; |
|
rtnl_lock(); |
|
} |
|
|
|
err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); |
|
if (err) |
|
goto errout; |
|
|
|
block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, |
|
extack); |
|
if (IS_ERR(block)) { |
|
err = PTR_ERR(block); |
|
goto errout; |
|
} |
|
|
|
chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; |
|
if (chain_index > TC_ACT_EXT_VAL_MASK) { |
|
NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
chain = tcf_chain_get(block, chain_index, false); |
|
if (!chain) { |
|
NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
|
|
mutex_lock(&chain->filter_chain_lock); |
|
tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
|
prio, false); |
|
mutex_unlock(&chain->filter_chain_lock); |
|
if (!tp || IS_ERR(tp)) { |
|
NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
|
err = tp ? PTR_ERR(tp) : -ENOENT; |
|
goto errout; |
|
} else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
|
NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
|
err = -EINVAL; |
|
goto errout; |
|
} |
|
|
|
fh = tp->ops->get(tp, t->tcm_handle); |
|
|
|
if (!fh) { |
|
NL_SET_ERR_MSG(extack, "Specified filter handle not found"); |
|
err = -ENOENT; |
|
} else { |
|
err = tfilter_notify(net, skb, n, tp, block, q, parent, |
|
fh, RTM_NEWTFILTER, true, rtnl_held); |
|
if (err < 0) |
|
NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); |
|
} |
|
|
|
tfilter_put(tp, fh); |
|
errout: |
|
if (chain) { |
|
if (tp && !IS_ERR(tp)) |
|
tcf_proto_put(tp, rtnl_held, NULL); |
|
tcf_chain_put(chain); |
|
} |
|
tcf_block_release(q, block, rtnl_held); |
|
|
|
if (rtnl_held) |
|
rtnl_unlock(); |
|
|
|
return err; |
|
} |
|
|
|
struct tcf_dump_args { |
|
struct tcf_walker w; |
|
struct sk_buff *skb; |
|
struct netlink_callback *cb; |
|
struct tcf_block *block; |
|
struct Qdisc *q; |
|
u32 parent; |
|
bool terse_dump; |
|
}; |
|
|
|
static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
|
{ |
|
struct tcf_dump_args *a = (void *)arg; |
|
struct net *net = sock_net(a->skb->sk); |
|
|
|
return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
|
n, NETLINK_CB(a->cb->skb).portid, |
|
a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
|
RTM_NEWTFILTER, a->terse_dump, true); |
|
} |
|
|
|
static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
|
struct sk_buff *skb, struct netlink_callback *cb, |
|
long index_start, long *p_index, bool terse) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct tcf_block *block = chain->block; |
|
struct tcmsg *tcm = nlmsg_data(cb->nlh); |
|
struct tcf_proto *tp, *tp_prev; |
|
struct tcf_dump_args arg; |
|
|
|
for (tp = __tcf_get_next_proto(chain, NULL); |
|
tp; |
|
tp_prev = tp, |
|
tp = __tcf_get_next_proto(chain, tp), |
|
tcf_proto_put(tp_prev, true, NULL), |
|
(*p_index)++) { |
|
if (*p_index < index_start) |
|
continue; |
|
if (TC_H_MAJ(tcm->tcm_info) && |
|
TC_H_MAJ(tcm->tcm_info) != tp->prio) |
|
continue; |
|
if (TC_H_MIN(tcm->tcm_info) && |
|
TC_H_MIN(tcm->tcm_info) != tp->protocol) |
|
continue; |
|
if (*p_index > index_start) |
|
memset(&cb->args[1], 0, |
|
sizeof(cb->args) - sizeof(cb->args[0])); |
|
if (cb->args[1] == 0) { |
|
if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
|
NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, NLM_F_MULTI, |
|
RTM_NEWTFILTER, false, true) <= 0) |
|
goto errout; |
|
cb->args[1] = 1; |
|
} |
|
if (!tp->ops->walk) |
|
continue; |
|
arg.w.fn = tcf_node_dump; |
|
arg.skb = skb; |
|
arg.cb = cb; |
|
arg.block = block; |
|
arg.q = q; |
|
arg.parent = parent; |
|
arg.w.stop = 0; |
|
arg.w.skip = cb->args[1] - 1; |
|
arg.w.count = 0; |
|
arg.w.cookie = cb->args[2]; |
|
arg.terse_dump = terse; |
|
tp->ops->walk(tp, &arg.w, true); |
|
cb->args[2] = arg.w.cookie; |
|
cb->args[1] = arg.w.count + 1; |
|
if (arg.w.stop) |
|
goto errout; |
|
} |
|
return true; |
|
|
|
errout: |
|
tcf_proto_put(tp, true, NULL); |
|
return false; |
|
} |
|
|
|
static const struct nla_policy tcf_tfilter_dump_policy[TCA_MAX + 1] = { |
|
[TCA_DUMP_FLAGS] = NLA_POLICY_BITFIELD32(TCA_DUMP_FLAGS_TERSE), |
|
}; |
|
|
|
/* called with RTNL */ |
|
static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct tcf_chain *chain, *chain_prev; |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tca[TCA_MAX + 1]; |
|
struct Qdisc *q = NULL; |
|
struct tcf_block *block; |
|
struct tcmsg *tcm = nlmsg_data(cb->nlh); |
|
bool terse_dump = false; |
|
long index_start; |
|
long index; |
|
u32 parent; |
|
int err; |
|
|
|
if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
|
return skb->len; |
|
|
|
err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
|
tcf_tfilter_dump_policy, cb->extack); |
|
if (err) |
|
return err; |
|
|
|
if (tca[TCA_DUMP_FLAGS]) { |
|
struct nla_bitfield32 flags = |
|
nla_get_bitfield32(tca[TCA_DUMP_FLAGS]); |
|
|
|
terse_dump = flags.value & TCA_DUMP_FLAGS_TERSE; |
|
} |
|
|
|
if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
|
block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
|
if (!block) |
|
goto out; |
|
/* If we work with block index, q is NULL and parent value |
|
* will never be used in the following code. The check |
|
* in tcf_fill_node prevents it. However, compiler does not |
|
* see that far, so set parent to zero to silence the warning |
|
* about parent being uninitialized. |
|
*/ |
|
parent = 0; |
|
} else { |
|
const struct Qdisc_class_ops *cops; |
|
struct net_device *dev; |
|
unsigned long cl = 0; |
|
|
|
dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
|
if (!dev) |
|
return skb->len; |
|
|
|
parent = tcm->tcm_parent; |
|
if (!parent) |
|
q = dev->qdisc; |
|
else |
|
q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); |
|
if (!q) |
|
goto out; |
|
cops = q->ops->cl_ops; |
|
if (!cops) |
|
goto out; |
|
if (!cops->tcf_block) |
|
goto out; |
|
if (TC_H_MIN(tcm->tcm_parent)) { |
|
cl = cops->find(q, tcm->tcm_parent); |
|
if (cl == 0) |
|
goto out; |
|
} |
|
block = cops->tcf_block(q, cl, NULL); |
|
if (!block) |
|
goto out; |
|
parent = block->classid; |
|
if (tcf_block_shared(block)) |
|
q = NULL; |
|
} |
|
|
|
index_start = cb->args[0]; |
|
index = 0; |
|
|
|
for (chain = __tcf_get_next_chain(block, NULL); |
|
chain; |
|
chain_prev = chain, |
|
chain = __tcf_get_next_chain(block, chain), |
|
tcf_chain_put(chain_prev)) { |
|
if (tca[TCA_CHAIN] && |
|
nla_get_u32(tca[TCA_CHAIN]) != chain->index) |
|
continue; |
|
if (!tcf_chain_dump(chain, q, parent, skb, cb, |
|
index_start, &index, terse_dump)) { |
|
tcf_chain_put(chain); |
|
err = -EMSGSIZE; |
|
break; |
|
} |
|
} |
|
|
|
if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
|
tcf_block_refcnt_put(block, true); |
|
cb->args[0] = index; |
|
|
|
out: |
|
/* If we did no progress, the error (EMSGSIZE) is real */ |
|
if (skb->len == 0 && err) |
|
return err; |
|
return skb->len; |
|
} |
|
|
|
static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops, |
|
void *tmplt_priv, u32 chain_index, |
|
struct net *net, struct sk_buff *skb, |
|
struct tcf_block *block, |
|
u32 portid, u32 seq, u16 flags, int event) |
|
{ |
|
unsigned char *b = skb_tail_pointer(skb); |
|
const struct tcf_proto_ops *ops; |
|
struct nlmsghdr *nlh; |
|
struct tcmsg *tcm; |
|
void *priv; |
|
|
|
ops = tmplt_ops; |
|
priv = tmplt_priv; |
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
|
if (!nlh) |
|
goto out_nlmsg_trim; |
|
tcm = nlmsg_data(nlh); |
|
tcm->tcm_family = AF_UNSPEC; |
|
tcm->tcm__pad1 = 0; |
|
tcm->tcm__pad2 = 0; |
|
tcm->tcm_handle = 0; |
|
if (block->q) { |
|
tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; |
|
tcm->tcm_parent = block->q->handle; |
|
} else { |
|
tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; |
|
tcm->tcm_block_index = block->index; |
|
} |
|
|
|
if (nla_put_u32(skb, TCA_CHAIN, chain_index)) |
|
goto nla_put_failure; |
|
|
|
if (ops) { |
|
if (nla_put_string(skb, TCA_KIND, ops->kind)) |
|
goto nla_put_failure; |
|
if (ops->tmplt_dump(skb, net, priv) < 0) |
|
goto nla_put_failure; |
|
} |
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
|
return skb->len; |
|
|
|
out_nlmsg_trim: |
|
nla_put_failure: |
|
nlmsg_trim(skb, b); |
|
return -EMSGSIZE; |
|
} |
|
|
|
static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, |
|
u32 seq, u16 flags, int event, bool unicast) |
|
{ |
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
|
struct tcf_block *block = chain->block; |
|
struct net *net = block->net; |
|
struct sk_buff *skb; |
|
int err = 0; |
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
|
if (!skb) |
|
return -ENOBUFS; |
|
|
|
if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
|
chain->index, net, skb, block, portid, |
|
seq, flags, event) <= 0) { |
|
kfree_skb(skb); |
|
return -EINVAL; |
|
} |
|
|
|
if (unicast) |
|
err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
|
else |
|
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
|
flags & NLM_F_ECHO); |
|
|
|
if (err > 0) |
|
err = 0; |
|
return err; |
|
} |
|
|
|
static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, |
|
void *tmplt_priv, u32 chain_index, |
|
struct tcf_block *block, struct sk_buff *oskb, |
|
u32 seq, u16 flags, bool unicast) |
|
{ |
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
|
struct net *net = block->net; |
|
struct sk_buff *skb; |
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
|
if (!skb) |
|
return -ENOBUFS; |
|
|
|
if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb, |
|
block, portid, seq, flags, RTM_DELCHAIN) <= 0) { |
|
kfree_skb(skb); |
|
return -EINVAL; |
|
} |
|
|
|
if (unicast) |
|
return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
|
|
|
return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); |
|
} |
|
|
|
static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, |
|
struct nlattr **tca, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
const struct tcf_proto_ops *ops; |
|
char name[IFNAMSIZ]; |
|
void *tmplt_priv; |
|
|
|
/* If kind is not set, user did not specify template. */ |
|
if (!tca[TCA_KIND]) |
|
return 0; |
|
|
|
if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
|
NL_SET_ERR_MSG(extack, "Specified TC chain template name too long"); |
|
return -EINVAL; |
|
} |
|
|
|
ops = tcf_proto_lookup_ops(name, true, extack); |
|
if (IS_ERR(ops)) |
|
return PTR_ERR(ops); |
|
if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { |
|
NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
tmplt_priv = ops->tmplt_create(net, chain, tca, extack); |
|
if (IS_ERR(tmplt_priv)) { |
|
module_put(ops->owner); |
|
return PTR_ERR(tmplt_priv); |
|
} |
|
chain->tmplt_ops = ops; |
|
chain->tmplt_priv = tmplt_priv; |
|
return 0; |
|
} |
|
|
|
static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
|
void *tmplt_priv) |
|
{ |
|
/* If template ops are set, no work to do for us. */ |
|
if (!tmplt_ops) |
|
return; |
|
|
|
tmplt_ops->tmplt_destroy(tmplt_priv); |
|
module_put(tmplt_ops->owner); |
|
} |
|
|
|
/* Add/delete/get a chain */ |
|
|
|
static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tca[TCA_MAX + 1]; |
|
struct tcmsg *t; |
|
u32 parent; |
|
u32 chain_index; |
|
struct Qdisc *q = NULL; |
|
struct tcf_chain *chain = NULL; |
|
struct tcf_block *block; |
|
unsigned long cl; |
|
int err; |
|
|
|
if (n->nlmsg_type != RTM_GETCHAIN && |
|
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
replay: |
|
err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
|
rtm_tca_policy, extack); |
|
if (err < 0) |
|
return err; |
|
|
|
t = nlmsg_data(n); |
|
parent = t->tcm_parent; |
|
cl = 0; |
|
|
|
block = tcf_block_find(net, &q, &parent, &cl, |
|
t->tcm_ifindex, t->tcm_block_index, extack); |
|
if (IS_ERR(block)) |
|
return PTR_ERR(block); |
|
|
|
chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; |
|
if (chain_index > TC_ACT_EXT_VAL_MASK) { |
|
NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
|
err = -EINVAL; |
|
goto errout_block; |
|
} |
|
|
|
mutex_lock(&block->lock); |
|
chain = tcf_chain_lookup(block, chain_index); |
|
if (n->nlmsg_type == RTM_NEWCHAIN) { |
|
if (chain) { |
|
if (tcf_chain_held_by_acts_only(chain)) { |
|
/* The chain exists only because there is |
|
* some action referencing it. |
|
*/ |
|
tcf_chain_hold(chain); |
|
} else { |
|
NL_SET_ERR_MSG(extack, "Filter chain already exists"); |
|
err = -EEXIST; |
|
goto errout_block_locked; |
|
} |
|
} else { |
|
if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
|
NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); |
|
err = -ENOENT; |
|
goto errout_block_locked; |
|
} |
|
chain = tcf_chain_create(block, chain_index); |
|
if (!chain) { |
|
NL_SET_ERR_MSG(extack, "Failed to create filter chain"); |
|
err = -ENOMEM; |
|
goto errout_block_locked; |
|
} |
|
} |
|
} else { |
|
if (!chain || tcf_chain_held_by_acts_only(chain)) { |
|
NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
|
err = -EINVAL; |
|
goto errout_block_locked; |
|
} |
|
tcf_chain_hold(chain); |
|
} |
|
|
|
if (n->nlmsg_type == RTM_NEWCHAIN) { |
|
/* Modifying chain requires holding parent block lock. In case |
|
* the chain was successfully added, take a reference to the |
|
* chain. This ensures that an empty chain does not disappear at |
|
* the end of this function. |
|
*/ |
|
tcf_chain_hold(chain); |
|
chain->explicitly_created = true; |
|
} |
|
mutex_unlock(&block->lock); |
|
|
|
switch (n->nlmsg_type) { |
|
case RTM_NEWCHAIN: |
|
err = tc_chain_tmplt_add(chain, net, tca, extack); |
|
if (err) { |
|
tcf_chain_put_explicitly_created(chain); |
|
goto errout; |
|
} |
|
|
|
tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
|
RTM_NEWCHAIN, false); |
|
break; |
|
case RTM_DELCHAIN: |
|
tfilter_notify_chain(net, skb, block, q, parent, n, |
|
chain, RTM_DELTFILTER); |
|
/* Flush the chain first as the user requested chain removal. */ |
|
tcf_chain_flush(chain, true); |
|
/* In case the chain was successfully deleted, put a reference |
|
* to the chain previously taken during addition. |
|
*/ |
|
tcf_chain_put_explicitly_created(chain); |
|
break; |
|
case RTM_GETCHAIN: |
|
err = tc_chain_notify(chain, skb, n->nlmsg_seq, |
|
n->nlmsg_flags, n->nlmsg_type, true); |
|
if (err < 0) |
|
NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); |
|
break; |
|
default: |
|
err = -EOPNOTSUPP; |
|
NL_SET_ERR_MSG(extack, "Unsupported message type"); |
|
goto errout; |
|
} |
|
|
|
errout: |
|
tcf_chain_put(chain); |
|
errout_block: |
|
tcf_block_release(q, block, true); |
|
if (err == -EAGAIN) |
|
/* Replay the request. */ |
|
goto replay; |
|
return err; |
|
|
|
errout_block_locked: |
|
mutex_unlock(&block->lock); |
|
goto errout_block; |
|
} |
|
|
|
/* called with RTNL */ |
|
static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tca[TCA_MAX + 1]; |
|
struct Qdisc *q = NULL; |
|
struct tcf_block *block; |
|
struct tcmsg *tcm = nlmsg_data(cb->nlh); |
|
struct tcf_chain *chain; |
|
long index_start; |
|
long index; |
|
int err; |
|
|
|
if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
|
return skb->len; |
|
|
|
err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
|
rtm_tca_policy, cb->extack); |
|
if (err) |
|
return err; |
|
|
|
if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
|
block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
|
if (!block) |
|
goto out; |
|
} else { |
|
const struct Qdisc_class_ops *cops; |
|
struct net_device *dev; |
|
unsigned long cl = 0; |
|
|
|
dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
|
if (!dev) |
|
return skb->len; |
|
|
|
if (!tcm->tcm_parent) |
|
q = dev->qdisc; |
|
else |
|
q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); |
|
|
|
if (!q) |
|
goto out; |
|
cops = q->ops->cl_ops; |
|
if (!cops) |
|
goto out; |
|
if (!cops->tcf_block) |
|
goto out; |
|
if (TC_H_MIN(tcm->tcm_parent)) { |
|
cl = cops->find(q, tcm->tcm_parent); |
|
if (cl == 0) |
|
goto out; |
|
} |
|
block = cops->tcf_block(q, cl, NULL); |
|
if (!block) |
|
goto out; |
|
if (tcf_block_shared(block)) |
|
q = NULL; |
|
} |
|
|
|
index_start = cb->args[0]; |
|
index = 0; |
|
|
|
mutex_lock(&block->lock); |
|
list_for_each_entry(chain, &block->chain_list, list) { |
|
if ((tca[TCA_CHAIN] && |
|
nla_get_u32(tca[TCA_CHAIN]) != chain->index)) |
|
continue; |
|
if (index < index_start) { |
|
index++; |
|
continue; |
|
} |
|
if (tcf_chain_held_by_acts_only(chain)) |
|
continue; |
|
err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
|
chain->index, net, skb, block, |
|
NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, NLM_F_MULTI, |
|
RTM_NEWCHAIN); |
|
if (err <= 0) |
|
break; |
|
index++; |
|
} |
|
mutex_unlock(&block->lock); |
|
|
|
if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
|
tcf_block_refcnt_put(block, true); |
|
cb->args[0] = index; |
|
|
|
out: |
|
/* If we did no progress, the error (EMSGSIZE) is real */ |
|
if (skb->len == 0 && err) |
|
return err; |
|
return skb->len; |
|
} |
|
|
|
void tcf_exts_destroy(struct tcf_exts *exts) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
if (exts->actions) { |
|
tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
|
kfree(exts->actions); |
|
} |
|
exts->nr_actions = 0; |
|
#endif |
|
} |
|
EXPORT_SYMBOL(tcf_exts_destroy); |
|
|
|
int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
|
struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
|
bool rtnl_held, struct netlink_ext_ack *extack) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
{ |
|
int init_res[TCA_ACT_MAX_PRIO] = {}; |
|
struct tc_action *act; |
|
size_t attr_size = 0; |
|
|
|
if (exts->police && tb[exts->police]) { |
|
struct tc_action_ops *a_o; |
|
|
|
a_o = tc_action_load_ops("police", tb[exts->police], rtnl_held, extack); |
|
if (IS_ERR(a_o)) |
|
return PTR_ERR(a_o); |
|
act = tcf_action_init_1(net, tp, tb[exts->police], |
|
rate_tlv, "police", ovr, |
|
TCA_ACT_BIND, a_o, init_res, |
|
rtnl_held, extack); |
|
module_put(a_o->owner); |
|
if (IS_ERR(act)) |
|
return PTR_ERR(act); |
|
|
|
act->type = exts->type = TCA_OLD_COMPAT; |
|
exts->actions[0] = act; |
|
exts->nr_actions = 1; |
|
tcf_idr_insert_many(exts->actions); |
|
} else if (exts->action && tb[exts->action]) { |
|
int err; |
|
|
|
err = tcf_action_init(net, tp, tb[exts->action], |
|
rate_tlv, NULL, ovr, TCA_ACT_BIND, |
|
exts->actions, init_res, |
|
&attr_size, rtnl_held, extack); |
|
if (err < 0) |
|
return err; |
|
exts->nr_actions = err; |
|
} |
|
} |
|
#else |
|
if ((exts->action && tb[exts->action]) || |
|
(exts->police && tb[exts->police])) { |
|
NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); |
|
return -EOPNOTSUPP; |
|
} |
|
#endif |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(tcf_exts_validate); |
|
|
|
void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
struct tcf_exts old = *dst; |
|
|
|
*dst = *src; |
|
tcf_exts_destroy(&old); |
|
#endif |
|
} |
|
EXPORT_SYMBOL(tcf_exts_change); |
|
|
|
#ifdef CONFIG_NET_CLS_ACT |
|
static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) |
|
{ |
|
if (exts->nr_actions == 0) |
|
return NULL; |
|
else |
|
return exts->actions[0]; |
|
} |
|
#endif |
|
|
|
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
struct nlattr *nest; |
|
|
|
if (exts->action && tcf_exts_has_actions(exts)) { |
|
/* |
|
* again for backward compatible mode - we want |
|
* to work with both old and new modes of entering |
|
* tc data even if iproute2 was newer - jhs |
|
*/ |
|
if (exts->type != TCA_OLD_COMPAT) { |
|
nest = nla_nest_start_noflag(skb, exts->action); |
|
if (nest == NULL) |
|
goto nla_put_failure; |
|
|
|
if (tcf_action_dump(skb, exts->actions, 0, 0, false) |
|
< 0) |
|
goto nla_put_failure; |
|
nla_nest_end(skb, nest); |
|
} else if (exts->police) { |
|
struct tc_action *act = tcf_exts_first_act(exts); |
|
nest = nla_nest_start_noflag(skb, exts->police); |
|
if (nest == NULL || !act) |
|
goto nla_put_failure; |
|
if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
|
goto nla_put_failure; |
|
nla_nest_end(skb, nest); |
|
} |
|
} |
|
return 0; |
|
|
|
nla_put_failure: |
|
nla_nest_cancel(skb, nest); |
|
return -1; |
|
#else |
|
return 0; |
|
#endif |
|
} |
|
EXPORT_SYMBOL(tcf_exts_dump); |
|
|
|
int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
struct nlattr *nest; |
|
|
|
if (!exts->action || !tcf_exts_has_actions(exts)) |
|
return 0; |
|
|
|
nest = nla_nest_start_noflag(skb, exts->action); |
|
if (!nest) |
|
goto nla_put_failure; |
|
|
|
if (tcf_action_dump(skb, exts->actions, 0, 0, true) < 0) |
|
goto nla_put_failure; |
|
nla_nest_end(skb, nest); |
|
return 0; |
|
|
|
nla_put_failure: |
|
nla_nest_cancel(skb, nest); |
|
return -1; |
|
#else |
|
return 0; |
|
#endif |
|
} |
|
EXPORT_SYMBOL(tcf_exts_terse_dump); |
|
|
|
int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
struct tc_action *a = tcf_exts_first_act(exts); |
|
if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
|
return -1; |
|
#endif |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(tcf_exts_dump_stats); |
|
|
|
static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags) |
|
{ |
|
if (*flags & TCA_CLS_FLAGS_IN_HW) |
|
return; |
|
*flags |= TCA_CLS_FLAGS_IN_HW; |
|
atomic_inc(&block->offloadcnt); |
|
} |
|
|
|
static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags) |
|
{ |
|
if (!(*flags & TCA_CLS_FLAGS_IN_HW)) |
|
return; |
|
*flags &= ~TCA_CLS_FLAGS_IN_HW; |
|
atomic_dec(&block->offloadcnt); |
|
} |
|
|
|
static void tc_cls_offload_cnt_update(struct tcf_block *block, |
|
struct tcf_proto *tp, u32 *cnt, |
|
u32 *flags, u32 diff, bool add) |
|
{ |
|
lockdep_assert_held(&block->cb_lock); |
|
|
|
spin_lock(&tp->lock); |
|
if (add) { |
|
if (!*cnt) |
|
tcf_block_offload_inc(block, flags); |
|
*cnt += diff; |
|
} else { |
|
*cnt -= diff; |
|
if (!*cnt) |
|
tcf_block_offload_dec(block, flags); |
|
} |
|
spin_unlock(&tp->lock); |
|
} |
|
|
|
static void |
|
tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp, |
|
u32 *cnt, u32 *flags) |
|
{ |
|
lockdep_assert_held(&block->cb_lock); |
|
|
|
spin_lock(&tp->lock); |
|
tcf_block_offload_dec(block, flags); |
|
*cnt = 0; |
|
spin_unlock(&tp->lock); |
|
} |
|
|
|
static int |
|
__tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, |
|
void *type_data, bool err_stop) |
|
{ |
|
struct flow_block_cb *block_cb; |
|
int ok_count = 0; |
|
int err; |
|
|
|
list_for_each_entry(block_cb, &block->flow_block.cb_list, list) { |
|
err = block_cb->cb(type, type_data, block_cb->cb_priv); |
|
if (err) { |
|
if (err_stop) |
|
return err; |
|
} else { |
|
ok_count++; |
|
} |
|
} |
|
return ok_count; |
|
} |
|
|
|
int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, |
|
void *type_data, bool err_stop, bool rtnl_held) |
|
{ |
|
bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
|
int ok_count; |
|
|
|
retry: |
|
if (take_rtnl) |
|
rtnl_lock(); |
|
down_read(&block->cb_lock); |
|
/* Need to obtain rtnl lock if block is bound to devs that require it. |
|
* In block bind code cb_lock is obtained while holding rtnl, so we must |
|
* obtain the locks in same order here. |
|
*/ |
|
if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { |
|
up_read(&block->cb_lock); |
|
take_rtnl = true; |
|
goto retry; |
|
} |
|
|
|
ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); |
|
|
|
up_read(&block->cb_lock); |
|
if (take_rtnl) |
|
rtnl_unlock(); |
|
return ok_count; |
|
} |
|
EXPORT_SYMBOL(tc_setup_cb_call); |
|
|
|
/* Non-destructive filter add. If filter that wasn't already in hardware is |
|
* successfully offloaded, increment block offloads counter. On failure, |
|
* previously offloaded filter is considered to be intact and offloads counter |
|
* is not decremented. |
|
*/ |
|
|
|
int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp, |
|
enum tc_setup_type type, void *type_data, bool err_stop, |
|
u32 *flags, unsigned int *in_hw_count, bool rtnl_held) |
|
{ |
|
bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
|
int ok_count; |
|
|
|
retry: |
|
if (take_rtnl) |
|
rtnl_lock(); |
|
down_read(&block->cb_lock); |
|
/* Need to obtain rtnl lock if block is bound to devs that require it. |
|
* In block bind code cb_lock is obtained while holding rtnl, so we must |
|
* obtain the locks in same order here. |
|
*/ |
|
if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { |
|
up_read(&block->cb_lock); |
|
take_rtnl = true; |
|
goto retry; |
|
} |
|
|
|
/* Make sure all netdevs sharing this block are offload-capable. */ |
|
if (block->nooffloaddevcnt && err_stop) { |
|
ok_count = -EOPNOTSUPP; |
|
goto err_unlock; |
|
} |
|
|
|
ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); |
|
if (ok_count < 0) |
|
goto err_unlock; |
|
|
|
if (tp->ops->hw_add) |
|
tp->ops->hw_add(tp, type_data); |
|
if (ok_count > 0) |
|
tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, |
|
ok_count, true); |
|
err_unlock: |
|
up_read(&block->cb_lock); |
|
if (take_rtnl) |
|
rtnl_unlock(); |
|
return ok_count < 0 ? ok_count : 0; |
|
} |
|
EXPORT_SYMBOL(tc_setup_cb_add); |
|
|
|
/* Destructive filter replace. If filter that wasn't already in hardware is |
|
* successfully offloaded, increment block offload counter. On failure, |
|
* previously offloaded filter is considered to be destroyed and offload counter |
|
* is decremented. |
|
*/ |
|
|
|
int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp, |
|
enum tc_setup_type type, void *type_data, bool err_stop, |
|
u32 *old_flags, unsigned int *old_in_hw_count, |
|
u32 *new_flags, unsigned int *new_in_hw_count, |
|
bool rtnl_held) |
|
{ |
|
bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
|
int ok_count; |
|
|
|
retry: |
|
if (take_rtnl) |
|
rtnl_lock(); |
|
down_read(&block->cb_lock); |
|
/* Need to obtain rtnl lock if block is bound to devs that require it. |
|
* In block bind code cb_lock is obtained while holding rtnl, so we must |
|
* obtain the locks in same order here. |
|
*/ |
|
if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { |
|
up_read(&block->cb_lock); |
|
take_rtnl = true; |
|
goto retry; |
|
} |
|
|
|
/* Make sure all netdevs sharing this block are offload-capable. */ |
|
if (block->nooffloaddevcnt && err_stop) { |
|
ok_count = -EOPNOTSUPP; |
|
goto err_unlock; |
|
} |
|
|
|
tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags); |
|
if (tp->ops->hw_del) |
|
tp->ops->hw_del(tp, type_data); |
|
|
|
ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); |
|
if (ok_count < 0) |
|
goto err_unlock; |
|
|
|
if (tp->ops->hw_add) |
|
tp->ops->hw_add(tp, type_data); |
|
if (ok_count > 0) |
|
tc_cls_offload_cnt_update(block, tp, new_in_hw_count, |
|
new_flags, ok_count, true); |
|
err_unlock: |
|
up_read(&block->cb_lock); |
|
if (take_rtnl) |
|
rtnl_unlock(); |
|
return ok_count < 0 ? ok_count : 0; |
|
} |
|
EXPORT_SYMBOL(tc_setup_cb_replace); |
|
|
|
/* Destroy filter and decrement block offload counter, if filter was previously |
|
* offloaded. |
|
*/ |
|
|
|
int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp, |
|
enum tc_setup_type type, void *type_data, bool err_stop, |
|
u32 *flags, unsigned int *in_hw_count, bool rtnl_held) |
|
{ |
|
bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
|
int ok_count; |
|
|
|
retry: |
|
if (take_rtnl) |
|
rtnl_lock(); |
|
down_read(&block->cb_lock); |
|
/* Need to obtain rtnl lock if block is bound to devs that require it. |
|
* In block bind code cb_lock is obtained while holding rtnl, so we must |
|
* obtain the locks in same order here. |
|
*/ |
|
if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { |
|
up_read(&block->cb_lock); |
|
take_rtnl = true; |
|
goto retry; |
|
} |
|
|
|
ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); |
|
|
|
tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags); |
|
if (tp->ops->hw_del) |
|
tp->ops->hw_del(tp, type_data); |
|
|
|
up_read(&block->cb_lock); |
|
if (take_rtnl) |
|
rtnl_unlock(); |
|
return ok_count < 0 ? ok_count : 0; |
|
} |
|
EXPORT_SYMBOL(tc_setup_cb_destroy); |
|
|
|
int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp, |
|
bool add, flow_setup_cb_t *cb, |
|
enum tc_setup_type type, void *type_data, |
|
void *cb_priv, u32 *flags, unsigned int *in_hw_count) |
|
{ |
|
int err = cb(type, type_data, cb_priv); |
|
|
|
if (err) { |
|
if (add && tc_skip_sw(*flags)) |
|
return err; |
|
} else { |
|
tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1, |
|
add); |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(tc_setup_cb_reoffload); |
|
|
|
static int tcf_act_get_cookie(struct flow_action_entry *entry, |
|
const struct tc_action *act) |
|
{ |
|
struct tc_cookie *cookie; |
|
int err = 0; |
|
|
|
rcu_read_lock(); |
|
cookie = rcu_dereference(act->act_cookie); |
|
if (cookie) { |
|
entry->cookie = flow_action_cookie_create(cookie->data, |
|
cookie->len, |
|
GFP_ATOMIC); |
|
if (!entry->cookie) |
|
err = -ENOMEM; |
|
} |
|
rcu_read_unlock(); |
|
return err; |
|
} |
|
|
|
static void tcf_act_put_cookie(struct flow_action_entry *entry) |
|
{ |
|
flow_action_cookie_destroy(entry->cookie); |
|
} |
|
|
|
void tc_cleanup_flow_action(struct flow_action *flow_action) |
|
{ |
|
struct flow_action_entry *entry; |
|
int i; |
|
|
|
flow_action_for_each(i, entry, flow_action) { |
|
tcf_act_put_cookie(entry); |
|
if (entry->destructor) |
|
entry->destructor(entry->destructor_priv); |
|
} |
|
} |
|
EXPORT_SYMBOL(tc_cleanup_flow_action); |
|
|
|
static void tcf_mirred_get_dev(struct flow_action_entry *entry, |
|
const struct tc_action *act) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
entry->dev = act->ops->get_dev(act, &entry->destructor); |
|
if (!entry->dev) |
|
return; |
|
entry->destructor_priv = entry->dev; |
|
#endif |
|
} |
|
|
|
static void tcf_tunnel_encap_put_tunnel(void *priv) |
|
{ |
|
struct ip_tunnel_info *tunnel = priv; |
|
|
|
kfree(tunnel); |
|
} |
|
|
|
static int tcf_tunnel_encap_get_tunnel(struct flow_action_entry *entry, |
|
const struct tc_action *act) |
|
{ |
|
entry->tunnel = tcf_tunnel_info_copy(act); |
|
if (!entry->tunnel) |
|
return -ENOMEM; |
|
entry->destructor = tcf_tunnel_encap_put_tunnel; |
|
entry->destructor_priv = entry->tunnel; |
|
return 0; |
|
} |
|
|
|
static void tcf_sample_get_group(struct flow_action_entry *entry, |
|
const struct tc_action *act) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
entry->sample.psample_group = |
|
act->ops->get_psample_group(act, &entry->destructor); |
|
entry->destructor_priv = entry->sample.psample_group; |
|
#endif |
|
} |
|
|
|
static void tcf_gate_entry_destructor(void *priv) |
|
{ |
|
struct action_gate_entry *oe = priv; |
|
|
|
kfree(oe); |
|
} |
|
|
|
static int tcf_gate_get_entries(struct flow_action_entry *entry, |
|
const struct tc_action *act) |
|
{ |
|
entry->gate.entries = tcf_gate_get_list(act); |
|
|
|
if (!entry->gate.entries) |
|
return -EINVAL; |
|
|
|
entry->destructor = tcf_gate_entry_destructor; |
|
entry->destructor_priv = entry->gate.entries; |
|
|
|
return 0; |
|
} |
|
|
|
static enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats) |
|
{ |
|
if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY)) |
|
return FLOW_ACTION_HW_STATS_DONT_CARE; |
|
else if (!hw_stats) |
|
return FLOW_ACTION_HW_STATS_DISABLED; |
|
|
|
return hw_stats; |
|
} |
|
|
|
int tc_setup_flow_action(struct flow_action *flow_action, |
|
const struct tcf_exts *exts) |
|
{ |
|
struct tc_action *act; |
|
int i, j, k, err = 0; |
|
|
|
BUILD_BUG_ON(TCA_ACT_HW_STATS_ANY != FLOW_ACTION_HW_STATS_ANY); |
|
BUILD_BUG_ON(TCA_ACT_HW_STATS_IMMEDIATE != FLOW_ACTION_HW_STATS_IMMEDIATE); |
|
BUILD_BUG_ON(TCA_ACT_HW_STATS_DELAYED != FLOW_ACTION_HW_STATS_DELAYED); |
|
|
|
if (!exts) |
|
return 0; |
|
|
|
j = 0; |
|
tcf_exts_for_each_action(i, act, exts) { |
|
struct flow_action_entry *entry; |
|
|
|
entry = &flow_action->entries[j]; |
|
spin_lock_bh(&act->tcfa_lock); |
|
err = tcf_act_get_cookie(entry, act); |
|
if (err) |
|
goto err_out_locked; |
|
|
|
entry->hw_stats = tc_act_hw_stats(act->hw_stats); |
|
|
|
if (is_tcf_gact_ok(act)) { |
|
entry->id = FLOW_ACTION_ACCEPT; |
|
} else if (is_tcf_gact_shot(act)) { |
|
entry->id = FLOW_ACTION_DROP; |
|
} else if (is_tcf_gact_trap(act)) { |
|
entry->id = FLOW_ACTION_TRAP; |
|
} else if (is_tcf_gact_goto_chain(act)) { |
|
entry->id = FLOW_ACTION_GOTO; |
|
entry->chain_index = tcf_gact_goto_chain_index(act); |
|
} else if (is_tcf_mirred_egress_redirect(act)) { |
|
entry->id = FLOW_ACTION_REDIRECT; |
|
tcf_mirred_get_dev(entry, act); |
|
} else if (is_tcf_mirred_egress_mirror(act)) { |
|
entry->id = FLOW_ACTION_MIRRED; |
|
tcf_mirred_get_dev(entry, act); |
|
} else if (is_tcf_mirred_ingress_redirect(act)) { |
|
entry->id = FLOW_ACTION_REDIRECT_INGRESS; |
|
tcf_mirred_get_dev(entry, act); |
|
} else if (is_tcf_mirred_ingress_mirror(act)) { |
|
entry->id = FLOW_ACTION_MIRRED_INGRESS; |
|
tcf_mirred_get_dev(entry, act); |
|
} else if (is_tcf_vlan(act)) { |
|
switch (tcf_vlan_action(act)) { |
|
case TCA_VLAN_ACT_PUSH: |
|
entry->id = FLOW_ACTION_VLAN_PUSH; |
|
entry->vlan.vid = tcf_vlan_push_vid(act); |
|
entry->vlan.proto = tcf_vlan_push_proto(act); |
|
entry->vlan.prio = tcf_vlan_push_prio(act); |
|
break; |
|
case TCA_VLAN_ACT_POP: |
|
entry->id = FLOW_ACTION_VLAN_POP; |
|
break; |
|
case TCA_VLAN_ACT_MODIFY: |
|
entry->id = FLOW_ACTION_VLAN_MANGLE; |
|
entry->vlan.vid = tcf_vlan_push_vid(act); |
|
entry->vlan.proto = tcf_vlan_push_proto(act); |
|
entry->vlan.prio = tcf_vlan_push_prio(act); |
|
break; |
|
default: |
|
err = -EOPNOTSUPP; |
|
goto err_out_locked; |
|
} |
|
} else if (is_tcf_tunnel_set(act)) { |
|
entry->id = FLOW_ACTION_TUNNEL_ENCAP; |
|
err = tcf_tunnel_encap_get_tunnel(entry, act); |
|
if (err) |
|
goto err_out_locked; |
|
} else if (is_tcf_tunnel_release(act)) { |
|
entry->id = FLOW_ACTION_TUNNEL_DECAP; |
|
} else if (is_tcf_pedit(act)) { |
|
for (k = 0; k < tcf_pedit_nkeys(act); k++) { |
|
switch (tcf_pedit_cmd(act, k)) { |
|
case TCA_PEDIT_KEY_EX_CMD_SET: |
|
entry->id = FLOW_ACTION_MANGLE; |
|
break; |
|
case TCA_PEDIT_KEY_EX_CMD_ADD: |
|
entry->id = FLOW_ACTION_ADD; |
|
break; |
|
default: |
|
err = -EOPNOTSUPP; |
|
goto err_out_locked; |
|
} |
|
entry->mangle.htype = tcf_pedit_htype(act, k); |
|
entry->mangle.mask = tcf_pedit_mask(act, k); |
|
entry->mangle.val = tcf_pedit_val(act, k); |
|
entry->mangle.offset = tcf_pedit_offset(act, k); |
|
entry->hw_stats = tc_act_hw_stats(act->hw_stats); |
|
entry = &flow_action->entries[++j]; |
|
} |
|
} else if (is_tcf_csum(act)) { |
|
entry->id = FLOW_ACTION_CSUM; |
|
entry->csum_flags = tcf_csum_update_flags(act); |
|
} else if (is_tcf_skbedit_mark(act)) { |
|
entry->id = FLOW_ACTION_MARK; |
|
entry->mark = tcf_skbedit_mark(act); |
|
} else if (is_tcf_sample(act)) { |
|
entry->id = FLOW_ACTION_SAMPLE; |
|
entry->sample.trunc_size = tcf_sample_trunc_size(act); |
|
entry->sample.truncate = tcf_sample_truncate(act); |
|
entry->sample.rate = tcf_sample_rate(act); |
|
tcf_sample_get_group(entry, act); |
|
} else if (is_tcf_police(act)) { |
|
entry->id = FLOW_ACTION_POLICE; |
|
entry->police.burst = tcf_police_burst(act); |
|
entry->police.rate_bytes_ps = |
|
tcf_police_rate_bytes_ps(act); |
|
entry->police.burst_pkt = tcf_police_burst_pkt(act); |
|
entry->police.rate_pkt_ps = |
|
tcf_police_rate_pkt_ps(act); |
|
entry->police.mtu = tcf_police_tcfp_mtu(act); |
|
entry->police.index = act->tcfa_index; |
|
} else if (is_tcf_ct(act)) { |
|
entry->id = FLOW_ACTION_CT; |
|
entry->ct.action = tcf_ct_action(act); |
|
entry->ct.zone = tcf_ct_zone(act); |
|
entry->ct.flow_table = tcf_ct_ft(act); |
|
} else if (is_tcf_mpls(act)) { |
|
switch (tcf_mpls_action(act)) { |
|
case TCA_MPLS_ACT_PUSH: |
|
entry->id = FLOW_ACTION_MPLS_PUSH; |
|
entry->mpls_push.proto = tcf_mpls_proto(act); |
|
entry->mpls_push.label = tcf_mpls_label(act); |
|
entry->mpls_push.tc = tcf_mpls_tc(act); |
|
entry->mpls_push.bos = tcf_mpls_bos(act); |
|
entry->mpls_push.ttl = tcf_mpls_ttl(act); |
|
break; |
|
case TCA_MPLS_ACT_POP: |
|
entry->id = FLOW_ACTION_MPLS_POP; |
|
entry->mpls_pop.proto = tcf_mpls_proto(act); |
|
break; |
|
case TCA_MPLS_ACT_MODIFY: |
|
entry->id = FLOW_ACTION_MPLS_MANGLE; |
|
entry->mpls_mangle.label = tcf_mpls_label(act); |
|
entry->mpls_mangle.tc = tcf_mpls_tc(act); |
|
entry->mpls_mangle.bos = tcf_mpls_bos(act); |
|
entry->mpls_mangle.ttl = tcf_mpls_ttl(act); |
|
break; |
|
default: |
|
goto err_out_locked; |
|
} |
|
} else if (is_tcf_skbedit_ptype(act)) { |
|
entry->id = FLOW_ACTION_PTYPE; |
|
entry->ptype = tcf_skbedit_ptype(act); |
|
} else if (is_tcf_skbedit_priority(act)) { |
|
entry->id = FLOW_ACTION_PRIORITY; |
|
entry->priority = tcf_skbedit_priority(act); |
|
} else if (is_tcf_gate(act)) { |
|
entry->id = FLOW_ACTION_GATE; |
|
entry->gate.index = tcf_gate_index(act); |
|
entry->gate.prio = tcf_gate_prio(act); |
|
entry->gate.basetime = tcf_gate_basetime(act); |
|
entry->gate.cycletime = tcf_gate_cycletime(act); |
|
entry->gate.cycletimeext = tcf_gate_cycletimeext(act); |
|
entry->gate.num_entries = tcf_gate_num_entries(act); |
|
err = tcf_gate_get_entries(entry, act); |
|
if (err) |
|
goto err_out_locked; |
|
} else { |
|
err = -EOPNOTSUPP; |
|
goto err_out_locked; |
|
} |
|
spin_unlock_bh(&act->tcfa_lock); |
|
|
|
if (!is_tcf_pedit(act)) |
|
j++; |
|
} |
|
|
|
err_out: |
|
if (err) |
|
tc_cleanup_flow_action(flow_action); |
|
|
|
return err; |
|
err_out_locked: |
|
spin_unlock_bh(&act->tcfa_lock); |
|
goto err_out; |
|
} |
|
EXPORT_SYMBOL(tc_setup_flow_action); |
|
|
|
unsigned int tcf_exts_num_actions(struct tcf_exts *exts) |
|
{ |
|
unsigned int num_acts = 0; |
|
struct tc_action *act; |
|
int i; |
|
|
|
tcf_exts_for_each_action(i, act, exts) { |
|
if (is_tcf_pedit(act)) |
|
num_acts += tcf_pedit_nkeys(act); |
|
else |
|
num_acts++; |
|
} |
|
return num_acts; |
|
} |
|
EXPORT_SYMBOL(tcf_exts_num_actions); |
|
|
|
#ifdef CONFIG_NET_CLS_ACT |
|
static int tcf_qevent_parse_block_index(struct nlattr *block_index_attr, |
|
u32 *p_block_index, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
*p_block_index = nla_get_u32(block_index_attr); |
|
if (!*p_block_index) { |
|
NL_SET_ERR_MSG(extack, "Block number may not be zero"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch, |
|
enum flow_block_binder_type binder_type, |
|
struct nlattr *block_index_attr, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
u32 block_index; |
|
int err; |
|
|
|
if (!block_index_attr) |
|
return 0; |
|
|
|
err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack); |
|
if (err) |
|
return err; |
|
|
|
if (!block_index) |
|
return 0; |
|
|
|
qe->info.binder_type = binder_type; |
|
qe->info.chain_head_change = tcf_chain_head_change_dflt; |
|
qe->info.chain_head_change_priv = &qe->filter_chain; |
|
qe->info.block_index = block_index; |
|
|
|
return tcf_block_get_ext(&qe->block, sch, &qe->info, extack); |
|
} |
|
EXPORT_SYMBOL(tcf_qevent_init); |
|
|
|
void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch) |
|
{ |
|
if (qe->info.block_index) |
|
tcf_block_put_ext(qe->block, sch, &qe->info); |
|
} |
|
EXPORT_SYMBOL(tcf_qevent_destroy); |
|
|
|
int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
u32 block_index; |
|
int err; |
|
|
|
if (!block_index_attr) |
|
return 0; |
|
|
|
err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack); |
|
if (err) |
|
return err; |
|
|
|
/* Bounce newly-configured block or change in block. */ |
|
if (block_index != qe->info.block_index) { |
|
NL_SET_ERR_MSG(extack, "Change of blocks is not supported"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(tcf_qevent_validate_change); |
|
|
|
struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb, |
|
struct sk_buff **to_free, int *ret) |
|
{ |
|
struct tcf_result cl_res; |
|
struct tcf_proto *fl; |
|
|
|
if (!qe->info.block_index) |
|
return skb; |
|
|
|
fl = rcu_dereference_bh(qe->filter_chain); |
|
|
|
switch (tcf_classify(skb, fl, &cl_res, false)) { |
|
case TC_ACT_SHOT: |
|
qdisc_qstats_drop(sch); |
|
__qdisc_drop(skb, to_free); |
|
*ret = __NET_XMIT_BYPASS; |
|
return NULL; |
|
case TC_ACT_STOLEN: |
|
case TC_ACT_QUEUED: |
|
case TC_ACT_TRAP: |
|
__qdisc_drop(skb, to_free); |
|
*ret = __NET_XMIT_STOLEN; |
|
return NULL; |
|
case TC_ACT_REDIRECT: |
|
skb_do_redirect(skb); |
|
*ret = __NET_XMIT_STOLEN; |
|
return NULL; |
|
} |
|
|
|
return skb; |
|
} |
|
EXPORT_SYMBOL(tcf_qevent_handle); |
|
|
|
int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe) |
|
{ |
|
if (!qe->info.block_index) |
|
return 0; |
|
return nla_put_u32(skb, attr_name, qe->info.block_index); |
|
} |
|
EXPORT_SYMBOL(tcf_qevent_dump); |
|
#endif |
|
|
|
static __net_init int tcf_net_init(struct net *net) |
|
{ |
|
struct tcf_net *tn = net_generic(net, tcf_net_id); |
|
|
|
spin_lock_init(&tn->idr_lock); |
|
idr_init(&tn->idr); |
|
return 0; |
|
} |
|
|
|
static void __net_exit tcf_net_exit(struct net *net) |
|
{ |
|
struct tcf_net *tn = net_generic(net, tcf_net_id); |
|
|
|
idr_destroy(&tn->idr); |
|
} |
|
|
|
static struct pernet_operations tcf_net_ops = { |
|
.init = tcf_net_init, |
|
.exit = tcf_net_exit, |
|
.id = &tcf_net_id, |
|
.size = sizeof(struct tcf_net), |
|
}; |
|
|
|
static int __init tc_filter_init(void) |
|
{ |
|
int err; |
|
|
|
tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
|
if (!tc_filter_wq) |
|
return -ENOMEM; |
|
|
|
err = register_pernet_subsys(&tcf_net_ops); |
|
if (err) |
|
goto err_register_pernet_subsys; |
|
|
|
rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, |
|
RTNL_FLAG_DOIT_UNLOCKED); |
|
rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, |
|
RTNL_FLAG_DOIT_UNLOCKED); |
|
rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, |
|
tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED); |
|
rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); |
|
rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); |
|
rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, |
|
tc_dump_chain, 0); |
|
|
|
return 0; |
|
|
|
err_register_pernet_subsys: |
|
destroy_workqueue(tc_filter_wq); |
|
return err; |
|
} |
|
|
|
subsys_initcall(tc_filter_init);
|
|
|