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libgtpnl
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gtp-link: set IPv6 socket only 

GTP driver bails out for IPv4-mapped-IPv6 socket with EADDRNOAVAIL,
to prevent issues with setsockopt IPV6_ADDRFORM.

GTP control plane checks that tunnel family matches the socket family
for this GTP device, ie. there is a 1:1 mapping between the socket
listener and the device which determines the supported IP tunnel header.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Change-Id: I887a107657059adeb14ae425576ae7ea9018f762
This commit is contained in:
Pablo Neira Ayuso 2024-01-31 18:17:51 +01:00 committed by Oliver Smith
parent 38b5e239d6
commit 9911f6bfeb
1 changed files with 5 additions and 0 deletions
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5
tools/gtp-link.c
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@ -75,6 +75,7 @@ static int setup_socket(struct gtp_server_sock *gtp_sock, int family)
{
int fd1 = socket(family, SOCK_DGRAM, 0);
int fd2 = socket(family, SOCK_DGRAM, 0);
int one = 1;
if (fd1 < 0 || fd2 < 0)
return -1;
@ -95,6 +96,10 @@ static int setup_socket(struct gtp_server_sock *gtp_sock, int family)
gtp_sock->len = sizeof(struct sockaddr_in6);
setup_sockaddr_in6(&gtp_sock->sockaddr.fd1.in6, 3386);
setup_sockaddr_in6(&gtp_sock->sockaddr.fd2.in6, 2152);
if (setsockopt(fd1, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)) < 0)
perror("setsockopt IPV6_V6ONLY: ");
if (setsockopt(fd2, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)) < 0)
perror("setsockopt IPV6_V6ONLY: ");
break;
}