[sync] PR-906: ipv6: Add lwtunnel encap size of all siblings in nexthop calculation · Pull Request !913 · openEuler/kernel

### 1. Origin pull request:
https://gitee.com/openeuler/kernel/pulls/906

### 2. Original pull request related issue(s):
https://gitee.com/openeuler/kernel/issues/I6GT9T

### 3. Original pull request related commit(s):
| Sha | Datetime | Message |
|---|---|---|
|[d48ab856](https://gitee.com/openeuler/kernel/commits/d48ab85662c1d67ca4a4f4706844e827d310a858)|2023-06-05 11:16:07 +0800 CST|ipv6: Add lwtunnel encap size of all siblings in nexthop calculation stable inclusion from stable-v5.10.173 commit da26369377f0b671c14692e2d65ceb38131053e1 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6GT9T Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=da26369377f0b671c14692e2d65ceb38131053e1 -------------------------------- [ Upstream commit 4cc59f386991ec9374cb4bc83dbe1c0b5a95033f ] In function rt6_nlmsg_size(), the length of nexthop is calculated by multipling the nexthop length of fib6_info and the number of siblings. However if the fib6_info has no lwtunnel but the siblings have lwtunnels, the nexthop length is less than it should be, and it will trigger a warning in inet6_rt_notify() as follows: WARNING: CPU: 0 PID: 6082 at net/ipv6/route.c:6180 inet6_rt_notify+0x120/0x130 ...... Call Trace: <TASK> fib6_add_rt2node+0x685/0xa30 fib6_add+0x96/0x1b0 ip6_route_add+0x50/0xd0 inet6_rtm_newroute+0x97/0xa0 rtnetlink_rcv_msg+0x156/0x3d0 netlink_rcv_skb+0x5a/0x110 netlink_unicast+0x246/0x350 netlink_sendmsg+0x250/0x4c0 sock_sendmsg+0x66/0x70 ___sys_sendmsg+0x7c/0xd0 __sys_sendmsg+0x5d/0xb0 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc This bug can be reproduced by script: ip -6 addr add 2002::2/64 dev ens2 ip -6 route add 100::/64 via 2002::1 dev ens2 metric 100 for i in 10 20 30 40 50 60 70; do 	ip link add link ens2 name ipv_$i type ipvlan 	ip -6 addr add 2002::$i/64 dev ipv_$i 	ifconfig ipv_$i up done for i in 10 20 30 40 50 60; do 	ip -6 route append 100::/64 encap ip6 dst 2002::$i via 2002::1 dev ipv_$i metric 100 done ip -6 route append 100::/64 via 2002::1 dev ipv_70 metric 100 This patch fixes it by adding nexthop_len of every siblings using rt6_nh_nlmsg_size(). Fixes: beb1afac518d ("net: ipv6: Add support to dump multipath routes via RTA_MULTIPATH attribute") Signed-off-by: Lu Wei <luwei32@huawei.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20230222083629.335683-2-luwei32@huawei.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Lu Wei <luwei32@huawei.com> |

GVPopenEuler/kernel

搜索帮助

GVP openEuler/kernel