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3411. [tuning] Use IPV6_USE_MIN_MTU or equivalent with TCP in addition to UDP. [RT #31690]

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Squashed commit of the following:

commit bcbe9ae7a99e1f7f4236a22739a793b51ace8684
Author: Mark Andrews <marka@isc.org>
Date:   Wed Oct 31 15:10:53 2012 +1100

    Use IPV6_USE_MIN_MTU for TCP as well as UDP
This commit is contained in:
Mark Andrews
2012-11-01 08:42:56 +11:00
parent b3f23e7a7d
commit c2e80cf47e
3 changed files with 57 additions and 35 deletions
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60
lib/isc/unix/socket.c
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@@ -2262,6 +2262,28 @@ clear_bsdcompat(void) {
}
#endif
static void
use_min_mtu(isc__socket_t *sock) {
#ifdef IPV6_USE_MIN_MTU
/* use minimum MTU */
if (sock->pf == AF_INET6) {
int on = 1;
(void)setsockopt(sock->fd, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
(void *)&on, sizeof(on));
}
#endif
#if defined(IPV6_MTU)
/*
* Use minimum MTU on IPv6 sockets.
*/
if (sock->pf == AF_INET6) {
int mtu = 1280;
(void)setsockopt(sock->fd, IPPROTO_IPV6, IPV6_MTU,
&mtu, sizeof(mtu));
}
#endif
}
static isc_result_t
opensocket(isc__socketmgr_t *manager, isc__socket_t *sock,
isc__socket_t *dup_socket)
@@ -2270,7 +2292,7 @@ opensocket(isc__socketmgr_t *manager, isc__socket_t *sock,
char strbuf[ISC_STRERRORSIZE];
const char *err = "socket";
int tries = 0;
#if defined(USE_CMSG) || defined(SO_BSDCOMPAT)
#if defined(USE_CMSG) || defined(SO_BSDCOMPAT) || defined(SO_NOSIGPIPE)
int on = 1;
#endif
#if defined(SO_RCVBUF)
@@ -2426,6 +2448,11 @@ opensocket(isc__socketmgr_t *manager, isc__socket_t *sock,
}
#endif
/*
* Use minimum mtu if possible.
*/
use_min_mtu(sock);
#if defined(USE_CMSG) || defined(SO_RCVBUF)
if (sock->type == isc_sockettype_udp) {
@@ -2490,32 +2517,6 @@ opensocket(isc__socketmgr_t *manager, isc__socket_t *sock,
}
#endif /* IPV6_RECVPKTINFO */
#endif /* ISC_PLATFORM_HAVEIN6PKTINFO */
#ifdef IPV6_USE_MIN_MTU /* RFC 3542, not too common yet*/
/* use minimum MTU */
if (sock->pf == AF_INET6 &&
setsockopt(sock->fd, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
(void *)&on, sizeof(on)) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d, IPV6_USE_MIN_MTU) "
"%s: %s", sock->fd,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
}
#endif
#if defined(IPV6_MTU)
/*
* Use minimum MTU on IPv6 sockets.
*/
if (sock->pf == AF_INET6) {
int mtu = 1280;
(void)setsockopt(sock->fd, IPPROTO_IPV6, IPV6_MTU,
&mtu, sizeof(mtu));
}
#endif
#if defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DONT)
/*
* Turn off Path MTU discovery on IPv6/UDP sockets.
@@ -3312,6 +3313,11 @@ internal_accept(isc_task_t *me, isc_event_t *ev) {
NEWCONNSOCK(dev)->bound = 1;
NEWCONNSOCK(dev)->connected = 1;
/*
* Use minimum mtu if possible.
*/
use_min_mtu(NEWCONNSOCK(dev));
/*
* Save away the remote address
*/