39f8e46bb4
This fixes ntpd when queries are sent to secondary IPv4 IP addresses. See https://bugs.busybox.net/show_bug.cgi?id=9146 Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
From 7cef4817d6d6d61a1166ed7dfc13537b95c65970 Mon Sep 17 00:00:00 2001
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From: Denys Vlasenko <vda.linux@googlemail.com>
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Date: Thu, 15 Sep 2016 13:20:51 +0200
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Subject: [PATCH] libbb:/send_to_from: do not require that "to" should have the
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same AF. Closes 9146
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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---
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libbb/udp_io.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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--- a/libbb/udp_io.c
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+++ b/libbb/udp_io.c
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@@ -70,7 +70,13 @@ send_to_from(int fd, void *buf, size_t l
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msg.msg_flags = flags;
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cmsgptr = CMSG_FIRSTHDR(&msg);
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- if (to->sa_family == AF_INET && from->sa_family == AF_INET) {
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+ /*
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+ * Users report that to->sa_family can be AF_INET6 too,
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+ * if "to" was acquired by recv_from_to(). IOW: recv_from_to()
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+ * was seen showing IPv6 "from" even when the destination
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+ * of received packet (our local address) was IPv4.
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+ */
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+ if (/* to->sa_family == AF_INET && */ from->sa_family == AF_INET) {
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struct in_pktinfo *pktptr;
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cmsgptr->cmsg_level = IPPROTO_IP;
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cmsgptr->cmsg_type = IP_PKTINFO;
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@@ -86,7 +92,7 @@ send_to_from(int fd, void *buf, size_t l
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pktptr->ipi_spec_dst = ((struct sockaddr_in*)from)->sin_addr;
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}
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# if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
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- else if (to->sa_family == AF_INET6 && from->sa_family == AF_INET6) {
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+ else if (/* to->sa_family == AF_INET6 && */ from->sa_family == AF_INET6) {
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struct in6_pktinfo *pktptr;
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cmsgptr->cmsg_level = IPPROTO_IPV6;
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cmsgptr->cmsg_type = IPV6_PKTINFO;
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