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use IPV6_PATHMTU socket option instead of IPV6_MTU

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The former is portable and available on BSD systems.
This commit is contained in:
Nikos Mavrogiannopoulos
2015-05-24 17:01:30 +02:00
parent 55eaf601b1
commit 36bd7e10fd
1 changed files with 13 additions and 2 deletions
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15
src/worker-vpn.c
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@@ -46,6 +46,11 @@
#include <c-ctype.h>
#include <worker-bandwidth.h>
#ifdef __linux__
/* for IPV6_PATHMTU */
# include <linux/in6.h>
#endif
#include <vpn.h>
#include "ipc.pb-c.h"
#include <cookies.h>
@@ -657,15 +662,21 @@ int mtu_not_ok(worker_st * ws)
ws->last_bad_mtu, ws->conn_mtu);
} else if (ws->proto == AF_INET6) { /* IPv6 */
int mtu;
socklen_t len = sizeof(mtu);
#ifdef IPV6_PATHMTU
struct ip6_mtuinfo mtuinfo;
socklen_t len = sizeof(mtuinfo);
if (getsockopt(ws->dtls_tptr.fd, IPPROTO_IPV6, IPV6_MTU, &mtu, &len) < 0 || mtu < 1280) {
if (getsockopt(ws->dtls_tptr.fd, IPPROTO_IPV6, IPV6_PATHMTU, &mtuinfo, &len) < 0 || mtuinfo.ip6m_mtu < 1280) {
oclog(ws, LOG_INFO, "cannot obtain IPv6 MTU (was %u); disabling DTLS",
ws->conn_mtu);
dtls_close(ws);
ws->udp_state = UP_DISABLED;
return -1;
}
mtu = mtuinfo.ip6m_mtu;
#else
mtu = 1280; /* minimum IPv6 MTU */
#endif
mtu -= CSTP_DTLS_OVERHEAD - ws->proto_overhead;