2019-06-04 15:11:33 +07:00
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// SPDX-License-Identifier: GPL-2.0-only
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2017-01-23 17:07:09 +07:00
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/*
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* net/sched/act_sample.c - Packet sampling tc action
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* Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gfp.h>
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#include <net/net_namespace.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_sample.h>
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#include <net/tc_act/tc_sample.h>
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#include <net/psample.h>
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2019-03-20 21:00:09 +07:00
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#include <net/pkt_cls.h>
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2017-01-23 17:07:09 +07:00
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#include <linux/if_arp.h>
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static unsigned int sample_net_id;
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static struct tc_action_ops act_sample_ops;
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static const struct nla_policy sample_policy[TCA_SAMPLE_MAX + 1] = {
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[TCA_SAMPLE_PARMS] = { .len = sizeof(struct tc_sample) },
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[TCA_SAMPLE_RATE] = { .type = NLA_U32 },
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[TCA_SAMPLE_TRUNC_SIZE] = { .type = NLA_U32 },
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[TCA_SAMPLE_PSAMPLE_GROUP] = { .type = NLA_U32 },
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};
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static int tcf_sample_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a, int ovr,
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net/sched: prepare TC actions to properly validate the control action
- 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: db50514f9a9c ("net: sched: add termination action to allow goto chain")
Fixes: 97763dc0f401 ("net_sched: reject unknown tcfa_action values")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-03-20 20:59:59 +07:00
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int bind, bool rtnl_held, struct tcf_proto *tp,
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2018-07-05 21:24:25 +07:00
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struct netlink_ext_ack *extack)
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2017-01-23 17:07:09 +07:00
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{
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struct tc_action_net *tn = net_generic(net, sample_net_id);
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struct nlattr *tb[TCA_SAMPLE_MAX + 1];
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struct psample_group *psample_group;
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2019-08-01 20:02:51 +07:00
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u32 psample_group_num, rate, index;
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2019-03-20 21:00:09 +07:00
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struct tcf_chain *goto_ch = NULL;
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2017-01-23 17:07:09 +07:00
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struct tc_sample *parm;
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struct tcf_sample *s;
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bool exists = false;
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2018-07-05 21:24:32 +07:00
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int ret, err;
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2017-01-23 17:07:09 +07:00
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if (!nla)
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return -EINVAL;
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netlink: make validation more configurable for future strictness
We currently have two levels of strict validation:
1) liberal (default)
- undefined (type >= max) & NLA_UNSPEC attributes accepted
- attribute length >= expected accepted
- garbage at end of message accepted
2) strict (opt-in)
- NLA_UNSPEC attributes accepted
- attribute length >= expected accepted
Split out parsing strictness into four different options:
* TRAILING - check that there's no trailing data after parsing
attributes (in message or nested)
* MAXTYPE - reject attrs > max known type
* UNSPEC - reject attributes with NLA_UNSPEC policy entries
* STRICT_ATTRS - strictly validate attribute size
The default for future things should be *everything*.
The current *_strict() is a combination of TRAILING and MAXTYPE,
and is renamed to _deprecated_strict().
The current regular parsing has none of this, and is renamed to
*_parse_deprecated().
Additionally it allows us to selectively set one of the new flags
even on old policies. Notably, the UNSPEC flag could be useful in
this case, since it can be arranged (by filling in the policy) to
not be an incompatible userspace ABI change, but would then going
forward prevent forgetting attribute entries. Similar can apply
to the POLICY flag.
We end up with the following renames:
* nla_parse -> nla_parse_deprecated
* nla_parse_strict -> nla_parse_deprecated_strict
* nlmsg_parse -> nlmsg_parse_deprecated
* nlmsg_parse_strict -> nlmsg_parse_deprecated_strict
* nla_parse_nested -> nla_parse_nested_deprecated
* nla_validate_nested -> nla_validate_nested_deprecated
Using spatch, of course:
@@
expression TB, MAX, HEAD, LEN, POL, EXT;
@@
-nla_parse(TB, MAX, HEAD, LEN, POL, EXT)
+nla_parse_deprecated(TB, MAX, HEAD, LEN, POL, EXT)
@@
expression NLH, HDRLEN, TB, MAX, POL, EXT;
@@
-nlmsg_parse(NLH, HDRLEN, TB, MAX, POL, EXT)
+nlmsg_parse_deprecated(NLH, HDRLEN, TB, MAX, POL, EXT)
@@
expression NLH, HDRLEN, TB, MAX, POL, EXT;
@@
-nlmsg_parse_strict(NLH, HDRLEN, TB, MAX, POL, EXT)
+nlmsg_parse_deprecated_strict(NLH, HDRLEN, TB, MAX, POL, EXT)
@@
expression TB, MAX, NLA, POL, EXT;
@@
-nla_parse_nested(TB, MAX, NLA, POL, EXT)
+nla_parse_nested_deprecated(TB, MAX, NLA, POL, EXT)
@@
expression START, MAX, POL, EXT;
@@
-nla_validate_nested(START, MAX, POL, EXT)
+nla_validate_nested_deprecated(START, MAX, POL, EXT)
@@
expression NLH, HDRLEN, MAX, POL, EXT;
@@
-nlmsg_validate(NLH, HDRLEN, MAX, POL, EXT)
+nlmsg_validate_deprecated(NLH, HDRLEN, MAX, POL, EXT)
For this patch, don't actually add the strict, non-renamed versions
yet so that it breaks compile if I get it wrong.
Also, while at it, make nla_validate and nla_parse go down to a
common __nla_validate_parse() function to avoid code duplication.
Ultimately, this allows us to have very strict validation for every
new caller of nla_parse()/nlmsg_parse() etc as re-introduced in the
next patch, while existing things will continue to work as is.
In effect then, this adds fully strict validation for any new command.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-26 19:07:28 +07:00
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ret = nla_parse_nested_deprecated(tb, TCA_SAMPLE_MAX, nla,
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sample_policy, NULL);
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2017-01-23 17:07:09 +07:00
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if (ret < 0)
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return ret;
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if (!tb[TCA_SAMPLE_PARMS] || !tb[TCA_SAMPLE_RATE] ||
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!tb[TCA_SAMPLE_PSAMPLE_GROUP])
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return -EINVAL;
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parm = nla_data(tb[TCA_SAMPLE_PARMS]);
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2019-08-01 20:02:51 +07:00
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index = parm->index;
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err = tcf_idr_check_alloc(tn, &index, a, bind);
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2018-07-05 21:24:32 +07:00
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if (err < 0)
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return err;
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exists = err;
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2017-01-23 17:07:09 +07:00
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if (exists && bind)
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return 0;
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if (!exists) {
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2019-08-01 20:02:51 +07:00
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ret = tcf_idr_create(tn, index, est, a,
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2018-09-14 17:03:18 +07:00
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&act_sample_ops, bind, true);
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2018-07-05 21:24:32 +07:00
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if (ret) {
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2019-08-01 20:02:51 +07:00
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tcf_idr_cleanup(tn, index);
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2017-01-23 17:07:09 +07:00
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return ret;
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2018-07-05 21:24:32 +07:00
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}
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2017-01-23 17:07:09 +07:00
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ret = ACT_P_CREATED;
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2018-07-05 21:24:30 +07:00
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} else if (!ovr) {
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2017-08-30 13:31:59 +07:00
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tcf_idr_release(*a, bind);
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2018-07-05 21:24:30 +07:00
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return -EEXIST;
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2017-01-23 17:07:09 +07:00
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}
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2019-03-20 21:00:09 +07:00
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (err < 0)
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goto release_idr;
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2017-01-23 17:07:09 +07:00
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2019-04-04 17:31:35 +07:00
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rate = nla_get_u32(tb[TCA_SAMPLE_RATE]);
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if (!rate) {
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NL_SET_ERR_MSG(extack, "invalid sample rate");
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err = -EINVAL;
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goto put_chain;
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}
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2018-08-15 01:46:16 +07:00
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psample_group_num = nla_get_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP]);
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psample_group = psample_group_get(net, psample_group_num);
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2017-01-31 16:33:53 +07:00
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if (!psample_group) {
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2019-03-20 21:00:09 +07:00
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err = -ENOMEM;
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goto put_chain;
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2017-01-31 16:33:53 +07:00
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}
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2018-08-15 01:46:16 +07:00
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s = to_sample(*a);
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spin_lock_bh(&s->tcf_lock);
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2019-03-20 21:00:09 +07:00
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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2019-04-04 17:31:35 +07:00
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s->rate = rate;
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2018-08-15 01:46:16 +07:00
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s->psample_group_num = psample_group_num;
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2019-08-28 01:49:38 +07:00
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rcu_swap_protected(s->psample_group, psample_group,
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lockdep_is_held(&s->tcf_lock));
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2017-01-23 17:07:09 +07:00
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if (tb[TCA_SAMPLE_TRUNC_SIZE]) {
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s->truncate = true;
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s->trunc_size = nla_get_u32(tb[TCA_SAMPLE_TRUNC_SIZE]);
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}
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2018-08-15 01:46:16 +07:00
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spin_unlock_bh(&s->tcf_lock);
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2019-08-28 01:49:38 +07:00
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if (psample_group)
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psample_group_put(psample_group);
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2019-03-20 21:00:09 +07:00
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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2017-01-23 17:07:09 +07:00
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if (ret == ACT_P_CREATED)
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2017-08-30 13:31:59 +07:00
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tcf_idr_insert(tn, *a);
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2017-01-23 17:07:09 +07:00
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return ret;
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2019-03-20 21:00:09 +07:00
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put_chain:
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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release_idr:
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tcf_idr_release(*a, bind);
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return err;
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2017-01-23 17:07:09 +07:00
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}
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2017-12-06 03:53:07 +07:00
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static void tcf_sample_cleanup(struct tc_action *a)
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2017-01-23 17:07:09 +07:00
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{
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2017-11-30 07:07:51 +07:00
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struct tcf_sample *s = to_sample(a);
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2017-01-23 17:07:09 +07:00
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struct psample_group *psample_group;
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2018-08-11 00:51:47 +07:00
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/* last reference to action, no need to lock */
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psample_group = rcu_dereference_protected(s->psample_group, 1);
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2017-01-23 17:07:09 +07:00
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RCU_INIT_POINTER(s->psample_group, NULL);
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2018-03-16 06:00:56 +07:00
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if (psample_group)
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psample_group_put(psample_group);
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2017-01-23 17:07:09 +07:00
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}
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static bool tcf_sample_dev_ok_push(struct net_device *dev)
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{
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switch (dev->type) {
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case ARPHRD_TUNNEL:
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case ARPHRD_TUNNEL6:
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case ARPHRD_SIT:
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case ARPHRD_IPGRE:
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2019-09-17 16:30:55 +07:00
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case ARPHRD_IP6GRE:
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2017-01-23 17:07:09 +07:00
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case ARPHRD_VOID:
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case ARPHRD_NONE:
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return false;
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default:
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return true;
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}
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}
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static int tcf_sample_act(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_sample *s = to_sample(a);
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struct psample_group *psample_group;
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int retval;
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int size;
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int iif;
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int oif;
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tcf_lastuse_update(&s->tcf_tm);
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bstats_cpu_update(this_cpu_ptr(s->common.cpu_bstats), skb);
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retval = READ_ONCE(s->tcf_action);
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2018-07-30 19:30:43 +07:00
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psample_group = rcu_dereference_bh(s->psample_group);
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2017-01-23 17:07:09 +07:00
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/* randomly sample packets according to rate */
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if (psample_group && (prandom_u32() % s->rate == 0)) {
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if (!skb_at_tc_ingress(skb)) {
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iif = skb->skb_iif;
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oif = skb->dev->ifindex;
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} else {
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iif = skb->dev->ifindex;
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oif = 0;
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}
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/* on ingress, the mac header gets popped, so push it back */
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if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
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skb_push(skb, skb->mac_len);
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size = s->truncate ? s->trunc_size : skb->len;
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psample_sample_packet(psample_group, skb, size, iif, oif,
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s->rate);
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if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
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skb_pull(skb, skb->mac_len);
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}
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return retval;
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}
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static int tcf_sample_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_sample *s = to_sample(a);
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struct tc_sample opt = {
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.index = s->tcf_index,
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2018-07-05 21:24:24 +07:00
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.refcnt = refcount_read(&s->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&s->tcf_bindcnt) - bind,
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2017-01-23 17:07:09 +07:00
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};
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struct tcf_t t;
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2018-08-15 01:46:16 +07:00
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spin_lock_bh(&s->tcf_lock);
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2018-08-11 00:51:47 +07:00
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opt.action = s->tcf_action;
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2017-01-23 17:07:09 +07:00
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if (nla_put(skb, TCA_SAMPLE_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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tcf_tm_dump(&t, &s->tcf_tm);
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if (nla_put_64bit(skb, TCA_SAMPLE_TM, sizeof(t), &t, TCA_SAMPLE_PAD))
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goto nla_put_failure;
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if (nla_put_u32(skb, TCA_SAMPLE_RATE, s->rate))
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goto nla_put_failure;
|
|
|
|
|
|
|
|
if (s->truncate)
|
|
|
|
if (nla_put_u32(skb, TCA_SAMPLE_TRUNC_SIZE, s->trunc_size))
|
|
|
|
goto nla_put_failure;
|
|
|
|
|
|
|
|
if (nla_put_u32(skb, TCA_SAMPLE_PSAMPLE_GROUP, s->psample_group_num))
|
|
|
|
goto nla_put_failure;
|
2018-08-15 01:46:16 +07:00
|
|
|
spin_unlock_bh(&s->tcf_lock);
|
2018-08-11 00:51:47 +07:00
|
|
|
|
2017-01-23 17:07:09 +07:00
|
|
|
return skb->len;
|
|
|
|
|
|
|
|
nla_put_failure:
|
2018-08-15 01:46:16 +07:00
|
|
|
spin_unlock_bh(&s->tcf_lock);
|
2017-01-23 17:07:09 +07:00
|
|
|
nlmsg_trim(skb, b);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tcf_sample_walker(struct net *net, struct sk_buff *skb,
|
|
|
|
struct netlink_callback *cb, int type,
|
2018-02-15 22:54:58 +07:00
|
|
|
const struct tc_action_ops *ops,
|
|
|
|
struct netlink_ext_ack *extack)
|
2017-01-23 17:07:09 +07:00
|
|
|
{
|
|
|
|
struct tc_action_net *tn = net_generic(net, sample_net_id);
|
|
|
|
|
2018-02-15 22:54:59 +07:00
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
|
2017-01-23 17:07:09 +07:00
|
|
|
}
|
|
|
|
|
2018-08-30 00:15:35 +07:00
|
|
|
static int tcf_sample_search(struct net *net, struct tc_action **a, u32 index)
|
2017-01-23 17:07:09 +07:00
|
|
|
{
|
|
|
|
struct tc_action_net *tn = net_generic(net, sample_net_id);
|
|
|
|
|
2017-08-30 13:31:59 +07:00
|
|
|
return tcf_idr_search(tn, a, index);
|
2017-01-23 17:07:09 +07:00
|
|
|
}
|
|
|
|
|
2019-09-13 22:28:40 +07:00
|
|
|
static void tcf_psample_group_put(void *priv)
|
|
|
|
{
|
|
|
|
struct psample_group *group = priv;
|
|
|
|
|
|
|
|
psample_group_put(group);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct psample_group *
|
|
|
|
tcf_sample_get_group(const struct tc_action *a,
|
|
|
|
tc_action_priv_destructor *destructor)
|
|
|
|
{
|
|
|
|
struct tcf_sample *s = to_sample(a);
|
|
|
|
struct psample_group *group;
|
|
|
|
|
|
|
|
spin_lock_bh(&s->tcf_lock);
|
|
|
|
group = rcu_dereference_protected(s->psample_group,
|
|
|
|
lockdep_is_held(&s->tcf_lock));
|
|
|
|
if (group) {
|
|
|
|
psample_group_take(group);
|
|
|
|
*destructor = tcf_psample_group_put;
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&s->tcf_lock);
|
|
|
|
|
|
|
|
return group;
|
|
|
|
}
|
|
|
|
|
2017-01-23 17:07:09 +07:00
|
|
|
static struct tc_action_ops act_sample_ops = {
|
|
|
|
.kind = "sample",
|
2019-02-10 19:25:00 +07:00
|
|
|
.id = TCA_ID_SAMPLE,
|
2017-01-23 17:07:09 +07:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.act = tcf_sample_act,
|
|
|
|
.dump = tcf_sample_dump,
|
|
|
|
.init = tcf_sample_init,
|
|
|
|
.cleanup = tcf_sample_cleanup,
|
|
|
|
.walk = tcf_sample_walker,
|
|
|
|
.lookup = tcf_sample_search,
|
2019-09-13 22:28:40 +07:00
|
|
|
.get_psample_group = tcf_sample_get_group,
|
2017-01-23 17:07:09 +07:00
|
|
|
.size = sizeof(struct tcf_sample),
|
|
|
|
};
|
|
|
|
|
|
|
|
static __net_init int sample_init_net(struct net *net)
|
|
|
|
{
|
|
|
|
struct tc_action_net *tn = net_generic(net, sample_net_id);
|
|
|
|
|
2019-08-26 00:01:32 +07:00
|
|
|
return tc_action_net_init(net, tn, &act_sample_ops);
|
2017-01-23 17:07:09 +07:00
|
|
|
}
|
|
|
|
|
2017-12-12 06:35:03 +07:00
|
|
|
static void __net_exit sample_exit_net(struct list_head *net_list)
|
2017-01-23 17:07:09 +07:00
|
|
|
{
|
2017-12-12 06:35:03 +07:00
|
|
|
tc_action_net_exit(net_list, sample_net_id);
|
2017-01-23 17:07:09 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct pernet_operations sample_net_ops = {
|
|
|
|
.init = sample_init_net,
|
2017-12-12 06:35:03 +07:00
|
|
|
.exit_batch = sample_exit_net,
|
2017-01-23 17:07:09 +07:00
|
|
|
.id = &sample_net_id,
|
|
|
|
.size = sizeof(struct tc_action_net),
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init sample_init_module(void)
|
|
|
|
{
|
|
|
|
return tcf_register_action(&act_sample_ops, &sample_net_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit sample_cleanup_module(void)
|
|
|
|
{
|
|
|
|
tcf_unregister_action(&act_sample_ops, &sample_net_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(sample_init_module);
|
|
|
|
module_exit(sample_cleanup_module);
|
|
|
|
|
2017-10-30 16:41:36 +07:00
|
|
|
MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
|
2017-01-23 17:07:09 +07:00
|
|
|
MODULE_DESCRIPTION("Packet sampling action");
|
|
|
|
MODULE_LICENSE("GPL v2");
|