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David Ahern d742dd6baa ipv4: Update fib_select_default to handle nexthop objects 
[ Upstream commit 7c74b0bec918c1e0ca0b4208038c156eacf8f13f ]

A user reported [0] hitting the WARN_ON in fib_info_nh:

    [ 8633.839816] ------------[ cut here ]------------
    [ 8633.839819] WARNING: CPU: 0 PID: 1719 at include/net/nexthop.h:251 fib_select_path+0x303/0x381
    ...
    [ 8633.839846] RIP: 0010:fib_select_path+0x303/0x381
    ...
    [ 8633.839848] RSP: 0018:ffffb04d407f7d00 EFLAGS: 00010286
    [ 8633.839850] RAX: 0000000000000000 RBX: ffff9460b9897ee8 RCX: 00000000000000fe
    [ 8633.839851] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
    [ 8633.839852] RBP: ffff946076049850 R08: 0000000059263a83 R09: ffff9460840e4000
    [ 8633.839853] R10: 0000000000000014 R11: 0000000000000000 R12: ffffb04d407f7dc0
    [ 8633.839854] R13: ffffffffa4ce3240 R14: 0000000000000000 R15: ffff9460b7681f60
    [ 8633.839857] FS:  00007fcac2e02700(0000) GS:ffff9460bdc00000(0000) knlGS:0000000000000000
    [ 8633.839858] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 8633.839859] CR2: 00007f27beb77e28 CR3: 0000000077734000 CR4: 00000000000006f0
    [ 8633.839867] Call Trace:
    [ 8633.839871]  ip_route_output_key_hash_rcu+0x421/0x890
    [ 8633.839873]  ip_route_output_key_hash+0x5e/0x80
    [ 8633.839876]  ip_route_output_flow+0x1a/0x50
    [ 8633.839878]  __ip4_datagram_connect+0x154/0x310
    [ 8633.839880]  ip4_datagram_connect+0x28/0x40
    [ 8633.839882]  __sys_connect+0xd6/0x100
    ...

The WARN_ON is triggered in fib_select_default which is invoked when
there are multiple default routes. Update the function to use
fib_info_nhc and convert the nexthop checks to use fib_nh_common.

Add test case that covers the affected code path.

[0] https://github.com/FRRouting/frr/issues/6089

Fixes: 493ced1ac47c ("ipv4: Allow routes to use nexthop objects")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-03-16 16:26:50 +08:00
..
android Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arm64 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
bpf bpf, test_verifier: switch bpf_get_stack's 0 s> r8 test 2021-03-16 16:26:42 +08:00
breakpoints Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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drivers Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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firmware Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ftrace tracing/selftests: Turn off timeout setting 2021-03-16 16:26:49 +08:00
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kcmp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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kmod selftests: kmod: fix handling test numbers above 9 2021-03-16 16:26:46 +08:00
kselftest Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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lib Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
livepatch Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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media_tests Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
membarrier Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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mqueue Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
net ipv4: Update fib_select_default to handle nexthop objects 2021-03-16 16:26:50 +08:00
netfilter Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
networking/timestamping Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
nsfs Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ntb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pidfd Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
powerpc selftests/powerpc: Add tlbie_test in .gitignore 2021-03-16 16:26:13 +08:00
prctl Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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rtc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
safesetid Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
seccomp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sigaltstack Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
size Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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splice Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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vDSO Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vm selftests/vm: fix map_hugetlb length used for testing read and write 2021-03-16 16:26:13 +08:00
watchdog Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
x86 selftests/x86/ptrace_syscall_32: Fix no-vDSO segfault 2021-03-16 16:25:57 +08:00
zram Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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