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author | Dong Chenchen <dongchenchen2@huawei.com> | 2024-11-27 05:08:50 +0100 |
---|---|---|
committer | Jakub Kicinski <kuba@kernel.org> | 2024-11-30 23:17:10 +0100 |
commit | c44daa7e3c73229f7ac74985acb8c7fb909c4e0a (patch) | |
tree | 555bfcca0a6aad14b8f3b6906ba0fdc642e72464 /net/ipv4 | |
parent | Merge branch 'bnxt-fix-failure-to-report-rss-context-in-ntuple-rule' (diff) | |
download | linux-c44daa7e3c73229f7ac74985acb8c7fb909c4e0a.tar.xz linux-c44daa7e3c73229f7ac74985acb8c7fb909c4e0a.zip |
net: Fix icmp host relookup triggering ip_rt_bug
arp link failure may trigger ip_rt_bug while xfrm enabled, call trace is:
WARNING: CPU: 0 PID: 0 at net/ipv4/route.c:1241 ip_rt_bug+0x14/0x20
Modules linked in:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc6-00077-g2e1b3cc9d7f7
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
RIP: 0010:ip_rt_bug+0x14/0x20
Call Trace:
<IRQ>
ip_send_skb+0x14/0x40
__icmp_send+0x42d/0x6a0
ipv4_link_failure+0xe2/0x1d0
arp_error_report+0x3c/0x50
neigh_invalidate+0x8d/0x100
neigh_timer_handler+0x2e1/0x330
call_timer_fn+0x21/0x120
__run_timer_base.part.0+0x1c9/0x270
run_timer_softirq+0x4c/0x80
handle_softirqs+0xac/0x280
irq_exit_rcu+0x62/0x80
sysvec_apic_timer_interrupt+0x77/0x90
The script below reproduces this scenario:
ip xfrm policy add src 0.0.0.0/0 dst 0.0.0.0/0 \
dir out priority 0 ptype main flag localok icmp
ip l a veth1 type veth
ip a a 192.168.141.111/24 dev veth0
ip l s veth0 up
ping 192.168.141.155 -c 1
icmp_route_lookup() create input routes for locally generated packets
while xfrm relookup ICMP traffic.Then it will set input route
(dst->out = ip_rt_bug) to skb for DESTUNREACH.
For ICMP err triggered by locally generated packets, dst->dev of output
route is loopback. Generally, xfrm relookup verification is not required
on loopback interfaces (net.ipv4.conf.lo.disable_xfrm = 1).
Skip icmp relookup for locally generated packets to fix it.
Fixes: 8b7817f3a959 ("[IPSEC]: Add ICMP host relookup support")
Signed-off-by: Dong Chenchen <dongchenchen2@huawei.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241127040850.1513135-1-dongchenchen2@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r-- | net/ipv4/icmp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 4f088fa1c2f2..963a89ae9c26 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -517,6 +517,9 @@ static struct rtable *icmp_route_lookup(struct net *net, struct flowi4 *fl4, if (!IS_ERR(dst)) { if (rt != rt2) return rt; + if (inet_addr_type_dev_table(net, route_lookup_dev, + fl4->daddr) == RTN_LOCAL) + return rt; } else if (PTR_ERR(dst) == -EPERM) { rt = NULL; } else { |