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Add a sysctl node allowing the specification of an address mask to use

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when replying to ICMP Address Mask Request packets.
This commit is contained in:
mdodd 2003-03-21 15:43:06 +00:00
parent 9fc39cde35
commit c2f6d7a732
1 changed files with 9 additions and 2 deletions
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11
sys/netinet/ip_icmp.c
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@ -84,7 +84,11 @@ SYSCTL_STRUCT(_net_inet_icmp, ICMPCTL_STATS, stats, CTLFLAG_RW,
static int icmpmaskrepl = 0;
SYSCTL_INT(_net_inet_icmp, ICMPCTL_MASKREPL, maskrepl, CTLFLAG_RW,
&icmpmaskrepl, 0, "");
&icmpmaskrepl, 0, "Reply to ICMP Address Mask Request packets.");
static u_int icmpmaskfake = 0;
SYSCTL_UINT(_net_inet_icmp, OID_AUTO, maskfake, CTLFLAG_RW,
&icmpmaskfake, 0, "Fake reply to ICMP Address Mask Request packets.");
static int drop_redirect = 0;
SYSCTL_INT(_net_inet_icmp, OID_AUTO, drop_redirect, CTLFLAG_RW,
@ -497,7 +501,10 @@ icmp_input(m, off)
if (ia->ia_ifp == 0)
break;
icp->icmp_type = ICMP_MASKREPLY;
icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr;
if (icmpmaskfake == 0)
icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr;
else
icp->icmp_mask = icmpmaskfake;
if (ip->ip_src.s_addr == 0) {
if (ia->ia_ifp->if_flags & IFF_BROADCAST)
ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr;