27e42e6a7e
bin/95041: subnet mask mismatch. PR: bin/95041 Obtained from: NetBSD Tested by: Hans Lambermont MFC after: 2 months
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
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* The mrouted program is covered by the license in the accompanying file
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* named "LICENSE". Use of the mrouted program represents acceptance of
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* the terms and conditions listed in that file.
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*
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* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
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* Leland Stanford Junior University.
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*
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*
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* config.c,v 3.8.4.10 1998/01/06 01:57:41 fenner Exp
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include "defs.h"
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#include <ifaddrs.h>
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/*
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* Query the kernel to find network interfaces that are multicast-capable
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* and install them in the uvifs array.
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*/
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void
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config_vifs_from_kernel()
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{
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struct ifaddrs *ifa, *ifap;
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register struct uvif *v;
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register vifi_t vifi;
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u_int32 addr, mask, subnet;
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int flags;
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if (getifaddrs(&ifap) < 0)
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log(LOG_ERR, errno, "getifaddrs");
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/*
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* Loop through all of the interfaces.
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*/
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
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/*
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* Ignore any interface for an address family other than IP.
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*/
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if (ifa->ifa_addr->sa_family != AF_INET)
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continue;
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addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
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/*
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* Ignore loopback interfaces and interfaces that do not support
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* multicast.
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*/
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flags = ifa->ifa_flags;
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if ((flags & (IFF_LOOPBACK|IFF_MULTICAST)) != IFF_MULTICAST)
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continue;
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/*
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* Ignore any interface whose address and mask do not define a
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* valid subnet number, or whose address is of the form {subnet,0}
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* or {subnet,-1}.
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*/
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mask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr.s_addr;
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subnet = addr & mask;
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if (!inet_valid_subnet(subnet, mask) ||
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addr == subnet ||
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addr == (subnet | ~mask)) {
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log(LOG_WARNING, 0,
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"ignoring %s, has invalid address (%s) and/or mask (%s)",
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ifa->ifa_name, inet_fmt(addr, s1), inet_fmt(mask, s2));
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continue;
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}
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/*
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* Ignore any interface that is connected to the same subnet as
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* one already installed in the uvifs array.
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*/
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for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
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if (strcmp(v->uv_name, ifa->ifa_name) == 0) {
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log(LOG_DEBUG, 0, "skipping %s (%s on subnet %s) (alias for vif#%u?)",
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v->uv_name, inet_fmt(addr, s1),
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inet_fmts(subnet, mask, s2), vifi);
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break;
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}
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if ((addr & v->uv_subnetmask) == v->uv_subnet ||
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(v->uv_subnet & mask) == subnet) {
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log(LOG_WARNING, 0, "ignoring %s, same subnet as %s",
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ifa->ifa_name, v->uv_name);
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break;
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}
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}
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if (vifi != numvifs) continue;
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/*
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* If there is room in the uvifs array, install this interface.
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*/
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if (numvifs == MAXVIFS) {
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log(LOG_WARNING, 0, "too many vifs, ignoring %s", ifa->ifa_name);
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continue;
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}
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v = &uvifs[numvifs];
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zero_vif(v, 0);
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v->uv_lcl_addr = addr;
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v->uv_subnet = subnet;
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v->uv_subnetmask = mask;
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v->uv_subnetbcast = subnet | ~mask;
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strlcpy(v->uv_name, ifa->ifa_name, sizeof(v->uv_name));
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if (flags & IFF_POINTOPOINT)
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v->uv_flags |= VIFF_REXMIT_PRUNES;
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log(LOG_INFO,0,"installing %s (%s on subnet %s) as vif #%u - rate=%d",
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v->uv_name, inet_fmt(addr, s1), inet_fmts(subnet, mask, s2),
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numvifs, v->uv_rate_limit);
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++numvifs;
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/*
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* If the interface is not yet up, set the vifs_down flag to
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* remind us to check again later.
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*/
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if (!(flags & IFF_UP)) {
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v->uv_flags |= VIFF_DOWN;
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vifs_down = TRUE;
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}
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}
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freeifaddrs(ifap);
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}
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