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![Davide Caratti](/assets/img/avatar_default.png)
- pass a pointer to struct tcf_proto in each actions's init() handler, to allow validating the control action, checking whether the chain exists and (eventually) refcounting it. - remove code that validates the control action after a successful call to the action's init() handler, and replace it with a test that forbids addition of actions having 'goto_chain' and NULL goto_chain pointer at the same time. - add tcf_action_check_ctrlact(), that will validate the control action and eventually allocate the action 'goto_chain' within the init() handler. - add tcf_action_set_ctrlact(), that will assign the control action and swap the current 'goto_chain' pointer with the new given one. This disallows 'goto_chain' on actions that don't initialize it properly in their init() handler, i.e. calling tcf_action_check_ctrlact() after successful IDR reservation and then calling tcf_action_set_ctrlact() to assign 'goto_chain' and 'tcf_action' consistently. By doing this, the kernel does not leak anymore refcounts when a valid 'goto chain' handle is replaced in TC actions, causing kmemleak splats like the following one: # tc chain add dev dd0 chain 42 ingress protocol ip flower \ > ip_proto tcp action drop # tc chain add dev dd0 chain 43 ingress protocol ip flower \ > ip_proto udp action drop # tc filter add dev dd0 ingress matchall \ > action gact goto chain 42 index 66 # tc filter replace dev dd0 ingress matchall \ > action gact goto chain 43 index 66 # echo scan >/sys/kernel/debug/kmemleak <...> unreferenced object 0xffff93c0ee09f000 (size 1024): comm "tc", pid 2565, jiffies 4295339808 (age 65.426s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 08 00 06 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000009b63f92d>] tc_ctl_chain+0x3d2/0x4c0 [<00000000683a8d72>] rtnetlink_rcv_msg+0x263/0x2d0 [<00000000ddd88f8e>] netlink_rcv_skb+0x4a/0x110 [<000000006126a348>] netlink_unicast+0x1a0/0x250 [<00000000b3340877>] netlink_sendmsg+0x2c1/0x3c0 [<00000000a25a2171>] sock_sendmsg+0x36/0x40 [<00000000f19ee1ec>] ___sys_sendmsg+0x280/0x2f0 [<00000000d0422042>] __sys_sendmsg+0x5e/0xa0 [<000000007a6c61f9>] do_syscall_64+0x5b/0x180 [<00000000ccd07542>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [<0000000013eaa334>] 0xffffffffffffffff Fixes:db50514f9a
("net: sched: add termination action to allow goto chain") Fixes:97763dc0f4
("net_sched: reject unknown tcfa_action values") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
203 lines
6.4 KiB
C
203 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_ACT_API_H
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#define __NET_ACT_API_H
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/*
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* Public action API for classifiers/qdiscs
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*/
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#include <linux/refcount.h>
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#include <net/sch_generic.h>
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#include <net/pkt_sched.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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struct tcf_idrinfo {
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struct mutex lock;
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struct idr action_idr;
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};
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struct tc_action_ops;
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struct tc_action {
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const struct tc_action_ops *ops;
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__u32 type; /* for backward compat(TCA_OLD_COMPAT) */
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__u32 order;
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struct tcf_idrinfo *idrinfo;
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u32 tcfa_index;
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refcount_t tcfa_refcnt;
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atomic_t tcfa_bindcnt;
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int tcfa_action;
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struct tcf_t tcfa_tm;
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struct gnet_stats_basic_packed tcfa_bstats;
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struct gnet_stats_basic_packed tcfa_bstats_hw;
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struct gnet_stats_queue tcfa_qstats;
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struct net_rate_estimator __rcu *tcfa_rate_est;
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spinlock_t tcfa_lock;
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struct gnet_stats_basic_cpu __percpu *cpu_bstats;
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struct gnet_stats_basic_cpu __percpu *cpu_bstats_hw;
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struct gnet_stats_queue __percpu *cpu_qstats;
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struct tc_cookie __rcu *act_cookie;
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struct tcf_chain *goto_chain;
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};
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#define tcf_index common.tcfa_index
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#define tcf_refcnt common.tcfa_refcnt
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#define tcf_bindcnt common.tcfa_bindcnt
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#define tcf_action common.tcfa_action
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#define tcf_tm common.tcfa_tm
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#define tcf_bstats common.tcfa_bstats
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#define tcf_qstats common.tcfa_qstats
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#define tcf_rate_est common.tcfa_rate_est
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#define tcf_lock common.tcfa_lock
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/* Update lastuse only if needed, to avoid dirtying a cache line.
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* We use a temp variable to avoid fetching jiffies twice.
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*/
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static inline void tcf_lastuse_update(struct tcf_t *tm)
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{
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unsigned long now = jiffies;
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if (tm->lastuse != now)
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tm->lastuse = now;
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if (unlikely(!tm->firstuse))
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tm->firstuse = now;
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}
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static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
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{
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dtm->install = jiffies_to_clock_t(jiffies - stm->install);
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dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
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dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
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dtm->expires = jiffies_to_clock_t(stm->expires);
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}
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#ifdef CONFIG_NET_CLS_ACT
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#define ACT_P_CREATED 1
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#define ACT_P_DELETED 1
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struct tc_action_ops {
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struct list_head head;
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char kind[IFNAMSIZ];
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enum tca_id id; /* identifier should match kind */
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size_t size;
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struct module *owner;
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int (*act)(struct sk_buff *, const struct tc_action *,
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struct tcf_result *); /* called under RCU BH lock*/
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int (*dump)(struct sk_buff *, struct tc_action *, int, int);
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void (*cleanup)(struct tc_action *);
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int (*lookup)(struct net *net, struct tc_action **a, u32 index);
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int (*init)(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **act, int ovr,
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int bind, bool rtnl_held, struct tcf_proto *tp,
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struct netlink_ext_ack *extack);
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int (*walk)(struct net *, struct sk_buff *,
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struct netlink_callback *, int,
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const struct tc_action_ops *,
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struct netlink_ext_ack *);
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void (*stats_update)(struct tc_action *, u64, u32, u64, bool);
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size_t (*get_fill_size)(const struct tc_action *act);
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struct net_device *(*get_dev)(const struct tc_action *a);
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void (*put_dev)(struct net_device *dev);
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};
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struct tc_action_net {
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struct tcf_idrinfo *idrinfo;
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const struct tc_action_ops *ops;
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};
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static inline
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int tc_action_net_init(struct tc_action_net *tn,
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const struct tc_action_ops *ops)
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{
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int err = 0;
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tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
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if (!tn->idrinfo)
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return -ENOMEM;
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tn->ops = ops;
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mutex_init(&tn->idrinfo->lock);
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idr_init(&tn->idrinfo->action_idr);
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return err;
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}
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void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
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struct tcf_idrinfo *idrinfo);
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static inline void tc_action_net_exit(struct list_head *net_list,
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unsigned int id)
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{
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struct net *net;
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rtnl_lock();
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list_for_each_entry(net, net_list, exit_list) {
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struct tc_action_net *tn = net_generic(net, id);
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tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
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kfree(tn->idrinfo);
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}
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rtnl_unlock();
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}
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int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops,
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struct netlink_ext_ack *extack);
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int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
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int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
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struct tc_action **a, const struct tc_action_ops *ops,
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int bind, bool cpustats);
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void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
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void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
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int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
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struct tc_action **a, int bind);
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int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
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static inline int tcf_idr_release(struct tc_action *a, bool bind)
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{
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return __tcf_idr_release(a, bind, false);
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}
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int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
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int tcf_unregister_action(struct tc_action_ops *a,
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struct pernet_operations *ops);
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int tcf_action_destroy(struct tc_action *actions[], int bind);
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int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
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int nr_actions, struct tcf_result *res);
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int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
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struct nlattr *est, char *name, int ovr, int bind,
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struct tc_action *actions[], size_t *attr_size,
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bool rtnl_held, struct netlink_ext_ack *extack);
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struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
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struct nlattr *nla, struct nlattr *est,
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char *name, int ovr, int bind,
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bool rtnl_held,
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struct netlink_ext_ack *extack);
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int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
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int ref);
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int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
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int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
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int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
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int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
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struct tcf_chain **handle,
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struct netlink_ext_ack *newchain);
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struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
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struct tcf_chain *newchain);
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#endif /* CONFIG_NET_CLS_ACT */
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static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
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u64 packets, u64 lastuse, bool hw)
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{
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#ifdef CONFIG_NET_CLS_ACT
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if (!a->ops->stats_update)
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return;
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a->ops->stats_update(a, bytes, packets, lastuse, hw);
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#endif
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}
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#endif
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