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Add a comment to document what setting "srcrt" is really on about in ipintr()

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This commit is contained in:
darrenr 2004-10-06 01:34:11 +00:00
parent eeee37654e
commit 0543239818
1 changed files with 16 additions and 2 deletions
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18
sys/netinet/ip_input.c
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@ -1,4 +1,4 @@
/* $NetBSD: ip_input.c,v 1.204 2004/09/29 21:28:34 christos Exp $ */
/* $NetBSD: ip_input.c,v 1.205 2004/10/06 01:34:11 darrenr Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@ -98,7 +98,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.204 2004/09/29 21:28:34 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.205 2004/10/06 01:34:11 darrenr Exp $");
#include "opt_inet.h"
#include "opt_gateway.h"
@ -649,6 +649,20 @@ ip_input(struct mbuf *m)
return;
ip = mtod(m, struct ip *);
hlen = ip->ip_hl << 2;
/*
* XXX The setting of "srcrt" here is to prevent ip_forward()
* from generating ICMP redirects for packets that have
* been redirected by a hook back out on to the same LAN that
* they came from and is not an indication that the packet
* is being inffluenced by source routing options. This
* allows things like
* "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
* where tlp0 is both on the 1.1.1.0/24 network and is the
* default route for hosts on 1.1.1.0/24. Of course this
* also requires a "map tlp0 ..." to complete the story.
* One might argue whether or not this kind of network config.
* should be supported in this manner...
*/
srcrt = (odst.s_addr != ip->ip_dst.s_addr);
}
#endif /* PFIL_HOOKS */