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Set source IPv6 address on NTP reply

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This is needed on systems with multiple IPv6 addresses to reply with
the same source address as the destination address of the NTP request.
This commit is contained in:
Miroslav Lichvar
2011-05-24 18:06:01 +02:00
parent 18605795a7
commit de4d14843f
2 changed files with 49 additions and 0 deletions
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40
ntp_io.c
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@@ -159,6 +159,16 @@ prepare_socket(int family)
LOG(LOGS_ERR, LOGF_NtpIO, "Could not request IPV6_V6ONLY socket option");
}
#endif
#ifdef IPV6_RECVPKTINFO
if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
LOG(LOGS_ERR, LOGF_NtpIO, "Could not request IPv6 packet info socket option");
}
#elif defined(IPV6_PKTINFO)
if (setsockopt(sock_fd, IPPROTO_IPV6, IPV6_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
LOG(LOGS_ERR, LOGF_NtpIO, "Could not request IPv6 packet info socket option");
}
#endif
}
#endif
@@ -345,6 +355,17 @@ read_from_socket(void *anything)
}
#endif
#ifdef IPV6_PKTINFO
if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
struct in6_pktinfo ipi;
memcpy(&ipi, CMSG_DATA(cmsg), sizeof(ipi));
memcpy(&remote_addr.local_ip_addr.addr.in6, &ipi.ipi6_addr.s6_addr,
sizeof (remote_addr.local_ip_addr.addr.in6));
remote_addr.local_ip_addr.family = IPADDR_INET6;
}
#endif
#ifdef SO_TIMESTAMP
if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMP) {
struct timeval tv;
@@ -445,6 +466,25 @@ send_packet(void *packet, int packetlen, NTP_Remote_Address *remote_addr)
}
#endif
#ifdef IPV6_PKTINFO
if (remote_addr->local_ip_addr.family == IPADDR_INET6) {
struct cmsghdr *cmsg;
struct in6_pktinfo *ipi;
cmsg = CMSG_FIRSTHDR(&msg);
memset(cmsg, 0, CMSG_SPACE(sizeof(struct in6_pktinfo)));
cmsglen += CMSG_SPACE(sizeof(struct in6_pktinfo));
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_PKTINFO;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
ipi = (struct in6_pktinfo *) CMSG_DATA(cmsg);
memcpy(&ipi->ipi6_addr.s6_addr, &remote_addr->local_ip_addr.addr.in6,
sizeof(ipi->ipi6_addr.s6_addr));
}
#endif
#if 0
LOG(LOGS_INFO, LOGF_NtpIO, "sending to %s:%d from %s",
UTI_IPToString(&remote_addr->ip_addr), remote_addr->port, UTI_IPToString(&remote_addr->local_ip_addr));