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Add sysctl net.inet.icmp.reply_src to specify the interface name

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used for the ICMP reply source in reponse to packets which are not
directly addressed to us.  By default continue with with normal
source selection.

Reviewed by:	bms
This commit is contained in:
Andre Oppermann 2004-02-02 22:53:16 +00:00
parent 1488eac8ec
commit b74d89bbbb
1 changed files with 19 additions and 0 deletions
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19
sys/netinet/ip_icmp.c
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@ -110,6 +110,10 @@ static int icmplim_output = 1;
SYSCTL_INT(_net_inet_icmp, OID_AUTO, icmplim_output, CTLFLAG_RW,
&icmplim_output, 0, "");
static char reply_src[IFNAMSIZ+1];
SYSCTL_STRING(_net_inet_icmp, OID_AUTO, reply_src, CTLFLAG_RW,
&reply_src, IFNAMSIZ, "icmp reply source for non-local packets.");
/*
* ICMP broadcast echo sysctl
*/
@ -618,6 +622,7 @@ icmp_reflect(m)
{
struct ip *ip = mtod(m, struct ip *);
struct ifaddr *ifa;
struct ifnet *ifn;
struct in_ifaddr *ia;
struct in_addr t;
struct mbuf *opts = 0;
@ -658,6 +663,20 @@ icmp_reflect(m)
goto match;
}
}
/*
* If the incoming packet was not addressed directly to us, use
* designated interface for icmp replies specified by sysctl
* net.inet.icmp.reply_src (default not set). Otherwise continue
* with normal source selection.
*/
if (reply_src[0] != '\0' && (ifn = ifunit(reply_src))) {
TAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ia = ifatoia(ifa);
goto match;
}
}
/*
* If the packet was transiting through us, use the address of
* the interface that is the closest to the packet source.