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Implement IPV6_UNICAST_HOPS socket option

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Implements the IPV6_UNICAST_HOPS socket option, which sets
the hop limit for outgoing unicast IPv6 packets.

Based on work from https://savannah.nongnu.org/patch/?9554

Co-authored-by: Christina Schoenrogge <christina.schoenrogge@garmin.com>
Co-authored-by: Chee Bin Hoh <hohcheebin@gmail.com>
Co-authored-by: hanhui <hanhui03@163.com>
This commit is contained in:
Nate Karstens 2023-05-10 09:58:30 -05:00
parent 732d3411bf
commit 64b758d00c
2 changed files with 13 additions and 0 deletions
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12
src/api/sockets.c
View File

@ -3169,6 +3169,12 @@ lwip_getsockopt_impl(int s, int level, int optname, void *optval, socklen_t *opt
/* Level: IPPROTO_IPV6 */
case IPPROTO_IPV6:
switch (optname) {
case IPV6_UNICAST_HOPS:
LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB(sock, *optlen, int);
*(int *)optval = sock->conn->pcb.ip->ttl;
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IPV6, IPV6_UNICAST_HOPS) = %d\n",
s, *(int *)optval));
break;
case IPV6_V6ONLY:
LWIP_SOCKOPT_CHECK_OPTLEN_CONN(sock, *optlen, int);
*(int *)optval = (netconn_get_ipv6only(sock->conn) ? 1 : 0);
@ -3646,6 +3652,12 @@ lwip_setsockopt_impl(int s, int level, int optname, const void *optval, socklen_
/* Level: IPPROTO_IPV6 */
case IPPROTO_IPV6:
switch (optname) {
case IPV6_UNICAST_HOPS:
LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB(sock, optlen, int);
sock->conn->pcb.ip->ttl = *(int *)optval;
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IPV6, IPV6_UNICAST_HOPS, ...) -> %d\n",
s, *(int *)optval));
break;
case IPV6_V6ONLY:
LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB(sock, optlen, int);
if (*(const int *)optval) {

1
src/include/lwip/sockets.h
View File

@ -297,6 +297,7 @@ struct linger {
* Options for level IPPROTO_IPV6
*/
#define IPV6_CHECKSUM 7 /* RFC3542: calculate and insert the ICMPv6 checksum for raw sockets. */
#define IPV6_UNICAST_HOPS 16 /* RFC3493: hop limit in outgoing unicast IPv6 packets */
#define IPV6_V6ONLY 27 /* RFC3493: boolean control to restrict AF_INET6 sockets to IPv6 communications only. */
#endif /* LWIP_IPV6 */