From: Pasi Sjöholm <[email protected]>
Some buggy dhcpv6-server implementations are re-using
the original source port from the dhcpv6-client messages
to their dhcpv6-reply packets (eg. Cisco EPC3940L) as a
destination port. Due to this we need to make sure that we
use DHCPV6_CLIENT_PORT (udp/546) as the source port when sending
client dhcpv6-messages.
---
gdhcp/common.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/gdhcp/common.c b/gdhcp/common.c
index 140d6f0..f3d4677 100644
--- a/gdhcp/common.c
+++ b/gdhcp/common.c
@@ -479,7 +479,8 @@ int dhcpv6_send_packet(int index, struct dhcpv6_packet
*dhcp_pkt, int len)
struct iovec v;
struct in6_pktinfo *pktinfo;
struct cmsghdr *cmsg;
- int fd, ret;
+ int fd, ret, opt = 1;
+ struct sockaddr_in6 src;
struct sockaddr_in6 dst;
void *control_buf;
size_t control_buf_len;
@@ -488,6 +489,17 @@ int dhcpv6_send_packet(int index, struct dhcpv6_packet
*dhcp_pkt, int len)
if (fd < 0)
return -errno;
+ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+
+ memset(&src, 0, sizeof(src));
+ src.sin6_family = AF_INET6;
+ src.sin6_port = htons(DHCPV6_CLIENT_PORT);
+
+ if (bind(fd, (struct sockaddr *) &src, sizeof(src)) <0) {
+ close(fd);
+ return -errno;
+ }
+
memset(&dst, 0, sizeof(dst));
dst.sin6_family = AF_INET6;
dst.sin6_port = htons(DHCPV6_SERVER_PORT);
--
2.1.0
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