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udhcpc6: add a few comments, no code changes.

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-04-13 19:43:15 +02:00
parent cc45cbcca4
commit 0d75e8b797
2 changed files with 10 additions and 0 deletions
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1
networking/udhcp/d6_dhcpc.c
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@ -531,6 +531,7 @@ static uint8_t *add_d6_client_options(uint8_t *ptr)
static int d6_mcast_from_client_config_ifindex(struct d6_packet *packet, uint8_t *end) static int d6_mcast_from_client_config_ifindex(struct d6_packet *packet, uint8_t *end)
{ {
/* FF02::1:2 is "All_DHCP_Relay_Agents_and_Servers" address */
static const uint8_t FF02__1_2[16] = { static const uint8_t FF02__1_2[16] = {
0xFF, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02,

9
networking/udhcp/d6_socket.c
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@ -38,6 +38,15 @@ int FAST_FUNC d6_read_interface(const char *interface, int *ifindex, struct in6_
log1("IP %s", inet_ntoa(((struct sockaddr_in *)ifa->ifa_addr)->sin_addr)); log1("IP %s", inet_ntoa(((struct sockaddr_in *)ifa->ifa_addr)->sin_addr));
} }
#endif #endif
/* RFC 3315
* 16. Client Source Address and Interface Selection
*
* "When a client sends a DHCP message to the
* All_DHCP_Relay_Agents_and_Servers address, ... ... The client
* MUST use a link-local address assigned to the interface for which it
* is requesting configuration information as the source address in the
* header of the IP datagram."
*/
if (ifa->ifa_addr->sa_family == AF_INET6 if (ifa->ifa_addr->sa_family == AF_INET6
&& IN6_IS_ADDR_LINKLOCAL(&sip6->sin6_addr) && IN6_IS_ADDR_LINKLOCAL(&sip6->sin6_addr)
) { ) {