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Date: Thu, 3 Sep 2026 15:38:48 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: =?UTF-8?B?w43DsWlnbw==?= Huguet <ihuguet@riseup.net>
Cc: David Ahern <dsahern@kernel.org>, Andrew Lunn <andrew+netdev@lunn.ch>,
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Subject: Re: [PATCH net v2] net/ipv6: don't route packets with unknown
 source address
Message-ID: <20260903153848.20b90f77@kernel.org>
In-Reply-To: <20260903121057.80006-1-ihuguet@riseup.net>
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On Thu,  3 Sep 2026 14:10:40 +0200 =C3=8D=C3=B1igo Huguet wrote:
> Don't allow routing packets with a source address that is not configured
> in the host. Allow it only in certain cases like when using a
> transparent socket, by setting the ANYSRC flag in flowi_flags.

breaks a bunch of selftests, too, FWIW
Please make sure to mend those if you want to forge ahead as a non-fix

  - selftests/net/xfrm_state.sh:
      "IPv6 unreachable from IPsec gateway s2" [FAIL]
      "IPv6 MTU exceeded from IPsec gateway s2" [FAIL]
    (the equivalent IPv4 cases still pass)

  - selftests/net/vrf_route_leaking.sh:
      "VRF ICMP local IPv6" [FAIL]
      "VRF tcp local connection IPv6" [FAIL]
      "VRF udp local connection IPv6" [FAIL]

  - selftests/net/srv6_encap_lookup_l3vpn_test.sh:
      "IPv6 connectivity: rt-1 -> rt-2 (tenant 100/200)" [FAIL]
      "IPv6 connectivity: rt-2 -> rt-1 (tenant 100/200)" [FAIL]
    (again, the IPv4 variants of the same tests pass)
...