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Implement RFC 6221 para 4.

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If the link address in a relayed DHCPv6 message is zero, don't
use it for addresss selection.
This commit is contained in:
Simon Kelley
2025-07-22 22:09:49 +01:00
parent 3034746748
commit d976d94e3d
1 changed files with 5 additions and 1 deletions
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6
src/rfc3315.c
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@@ -245,7 +245,11 @@ static int dhcp6_maybe_relay(struct state *state, unsigned char *inbuff, size_t
struct in6_addr align; struct in6_addr align;
/* the packet data is unaligned, copy to aligned storage */ /* the packet data is unaligned, copy to aligned storage */
memcpy(&align, inbuff + 2, IN6ADDRSZ); memcpy(&align, inbuff + 2, IN6ADDRSZ);
state->link_address = &align;
/* RFC6221 para 4 */
if (!IN6_IS_ADDR_UNSPECIFIED(&align))
state->link_address = &align;
/* zero is_unicast since that is now known to refer to the /* zero is_unicast since that is now known to refer to the
relayed packet, not the original sent by the client */ relayed packet, not the original sent by the client */
if (!dhcp6_maybe_relay(state, opt6_ptr(opt, 0), opt6_len(opt), client_addr, 0, now)) if (!dhcp6_maybe_relay(state, opt6_ptr(opt, 0), opt6_len(opt), client_addr, 0, now))