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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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29
lib/isc/win32/socket.c
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@@ -1431,6 +1431,18 @@ startio_send(isc_socket_t *sock, isc_socketevent_t *dev, int *nbytes,
return (status);
}
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
}
static isc_result_t
allocate_socket(isc_socketmgr_t *manager, isc_sockettype_t type,
isc_socket_t **socketp) {
@@ -1737,6 +1749,10 @@ socket_create(isc_socketmgr_t *manager, int pf, isc_sockettype_t type,
return (result);
}
/*
* Use minimum mtu if possible.
*/
use_min_mtu(sock);
#if defined(USE_CMSG) || defined(SO_RCVBUF)
if (type == isc_sockettype_udp) {
@@ -1774,14 +1790,6 @@ socket_create(isc_socketmgr_t *manager, int pf, isc_sockettype_t type,
strbuf);
}
#endif /* IPV6_RECVPKTINFO */
#ifdef IPV6_USE_MIN_MTU /*2292bis, not too common yet*/
/* use minimum MTU */
if (pf == AF_INET6) {
(void)setsockopt(sock->fd, IPPROTO_IPV6,
IPV6_USE_MIN_MTU,
(char *)&on, sizeof(on));
}
#endif
#endif /* ISC_PLATFORM_HAVEIPV6 */
#endif /* defined(USE_CMSG) */
@@ -2068,6 +2076,11 @@ internal_accept(isc_socket_t *sock, IoCompletionInfo *lpo, int accept_errno) {
result = make_nonblock(adev->newsocket->fd);
INSIST(result == ISC_R_SUCCESS);
/*
* Use minimum mtu if possible.
*/
use_min_mtu(adev->newsocket);
INSIST(setsockopt(nsock->fd, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
(char *)&sock->fd, sizeof(sock->fd)) == 0);