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ndp, dhcpv6, tcp, udp: Always use link-local as source if gateway isn't

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This shouldn't happen on any sane configuration, but I just met an
example of that: the default IPv6 gateway on the host is configured
with a global unicast address, we use that as source for RA, DHCPv6
replies, and the guest ignores it. Same later on if we talk TCP or
UDP and the guest has no idea where that address comes from.

Use our link-local address in case the gateway address is global.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
2021-10-20 11:10:23 +02:00
parent 12cfa6444c
commit 9618d24700
4 changed files with 28 additions and 5 deletions
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6
ndp.c
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@@ -183,7 +183,11 @@ int ndp(struct ctx *c, struct ethhdr *eh, size_t len)
c->addr6_seen = ip6h->saddr;
ip6hr->daddr = ip6h->saddr;
ip6hr->saddr = c->gw6;
if (IN6_IS_ADDR_LINKLOCAL(&c->gw6))
ip6hr->saddr = c->gw6;
else
ip6hr->saddr = c->addr6_ll;
ip6hr->payload_len = htons(sizeof(*ihr) + len);
ip6hr->hop_limit = IPPROTO_ICMPV6;
ihr->icmp6_cksum = 0;