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freebsd-dev/sbin/routed/if.c
Pedro F. Giffuni 8a16b7a18f General further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.
2017-11-20 19:49:47 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <stdint.h>
#include "defs.h"
#include "pathnames.h"
#ifdef __NetBSD__
__RCSID("$NetBSD$");
#elif defined(__FreeBSD__)
__RCSID("$FreeBSD$");
#else
__RCSID("$Revision: 2.27 $");
#ident "$Revision: 2.27 $"
#endif
struct ifhead ifnet = LIST_HEAD_INITIALIZER(ifnet); /* all interfaces */
struct ifhead remote_if = LIST_HEAD_INITIALIZER(remote_if); /* remote interfaces */
/* hash table for all interfaces, big enough to tolerate ridiculous
* numbers of IP aliases. Crazy numbers of aliases such as 7000
* still will not do well, but not just in looking up interfaces
* by name or address.
*/
#define AHASH_LEN 211 /* must be prime */
#define AHASH(a) &ahash_tbl[(a)%AHASH_LEN]
static struct interface *ahash_tbl[AHASH_LEN];
#define BHASH_LEN 211 /* must be prime */
#define BHASH(a) &bhash_tbl[(a)%BHASH_LEN]
static struct interface *bhash_tbl[BHASH_LEN];
/* hash for physical interface names.
* Assume there are never more 100 or 200 real interfaces, and that
* aliases are put on the end of the hash chains.
*/
#define NHASH_LEN 97
static struct interface *nhash_tbl[NHASH_LEN];
int tot_interfaces; /* # of remote and local interfaces */
int rip_interfaces; /* # of interfaces doing RIP */
static int foundloopback; /* valid flag for loopaddr */
naddr loopaddr; /* our address on loopback */
static struct rt_spare loop_rts;
struct timeval ifinit_timer;
static struct timeval last_ifinit;
#define IF_RESCAN_DELAY() (last_ifinit.tv_sec == now.tv_sec \
&& last_ifinit.tv_usec == now.tv_usec \
&& timercmp(&ifinit_timer, &now, >))
int have_ripv1_out; /* have a RIPv1 interface */
static int have_ripv1_in;
static void if_bad(struct interface *);
static int addrouteforif(struct interface *);
static struct interface**
nhash(char *p)
{
u_int i;
for (i = 0; *p != '\0'; p++) {
i = ((i<<1) & 0x7fffffff) | ((i>>31) & 1);
i ^= *p;
}
return &nhash_tbl[i % NHASH_LEN];
}
/* Link a new interface into the lists and hash tables.
*/
void
if_link(struct interface *ifp)
{
struct interface **hifp;
LIST_INSERT_HEAD(&ifnet, ifp, int_list);
hifp = AHASH(ifp->int_addr);
ifp->int_ahash_prev = hifp;
if ((ifp->int_ahash = *hifp) != NULL)
(*hifp)->int_ahash_prev = &ifp->int_ahash;
*hifp = ifp;
if (ifp->int_if_flags & IFF_BROADCAST) {
hifp = BHASH(ifp->int_brdaddr);
ifp->int_bhash_prev = hifp;
if ((ifp->int_bhash = *hifp) != NULL)
(*hifp)->int_bhash_prev = &ifp->int_bhash;
*hifp = ifp;
}
if (ifp->int_state & IS_REMOTE)
LIST_INSERT_HEAD(&remote_if, ifp, remote_list);
hifp = nhash(ifp->int_name);
if (ifp->int_state & IS_ALIAS) {
/* put aliases on the end of the hash chain */
while (*hifp != NULL)
hifp = &(*hifp)->int_nhash;
}
ifp->int_nhash_prev = hifp;
if ((ifp->int_nhash = *hifp) != NULL)
(*hifp)->int_nhash_prev = &ifp->int_nhash;
*hifp = ifp;
}
/* Find the interface with an address
*/
struct interface *
ifwithaddr(naddr addr,
int bcast, /* notice IFF_BROADCAST address */
int remote) /* include IS_REMOTE interfaces */
{
struct interface *ifp, *possible = NULL;
remote = (remote == 0) ? IS_REMOTE : 0;
for (ifp = *AHASH(addr); ifp; ifp = ifp->int_ahash) {
if (ifp->int_addr != addr)
continue;
if ((ifp->int_state & remote) != 0)
continue;
if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
return ifp;
possible = ifp;
}
if (possible || !bcast)
return possible;
for (ifp = *BHASH(addr); ifp; ifp = ifp->int_bhash) {
if (ifp->int_brdaddr != addr)
continue;
if ((ifp->int_state & remote) != 0)
continue;
if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0)
return ifp;
possible = ifp;
}
return possible;
}
/* find the interface with a name
*/
static struct interface *
ifwithname(char *name, /* "ec0" or whatever */
naddr addr) /* 0 or network address */
{
struct interface *ifp;
for (;;) {
for (ifp = *nhash(name); ifp != NULL; ifp = ifp->int_nhash) {
/* If the network address is not specified,
* ignore any alias interfaces. Otherwise, look
* for the interface with the target name and address.
*/
if (!strcmp(ifp->int_name, name)
&& ((addr == 0 && !(ifp->int_state & IS_ALIAS))
|| (ifp->int_addr == addr)))
return ifp;
}
/* If there is no known interface, maybe there is a
* new interface. So just once look for new interfaces.
*/
if (IF_RESCAN_DELAY())
return 0;
ifinit();
}
}
struct interface *
ifwithindex(u_short ifindex,
int rescan_ok)
{
struct interface *ifp;
for (;;) {
LIST_FOREACH(ifp, &ifnet, int_list) {
if (ifp->int_index == ifindex)
return ifp;
}
/* If there is no known interface, maybe there is a
* new interface. So just once look for new interfaces.
*/
if (!rescan_ok
|| IF_RESCAN_DELAY())
return 0;
ifinit();
}
}
/* Find an interface from which the specified address
* should have come from. Used for figuring out which
* interface a packet came in on.
*/
struct interface *
iflookup(naddr addr)
{
struct interface *ifp, *maybe;
int once = 0;
maybe = NULL;
for (;;) {
LIST_FOREACH(ifp, &ifnet, int_list) {
if (ifp->int_if_flags & IFF_POINTOPOINT) {
/* finished with a match */
if (ifp->int_dstaddr == addr)
return ifp;
} else {
/* finished with an exact match */
if (ifp->int_addr == addr)
return ifp;
/* Look for the longest approximate match.
*/
if (on_net(addr, ifp->int_net, ifp->int_mask)
&& (maybe == NULL
|| ifp->int_mask > maybe->int_mask))
maybe = ifp;
}
}
if (maybe != NULL || once || IF_RESCAN_DELAY())
return maybe;
once = 1;
/* If there is no known interface, maybe there is a
* new interface. So just once look for new interfaces.
*/
ifinit();
}
}
/* Return the classical netmask for an IP address.
*/
naddr /* host byte order */
std_mask(naddr addr) /* network byte order */
{
addr = ntohl(addr); /* was a host, not a network */
if (addr == 0) /* default route has mask 0 */
return 0;
if (IN_CLASSA(addr))
return IN_CLASSA_NET;
if (IN_CLASSB(addr))
return IN_CLASSB_NET;
return IN_CLASSC_NET;
}
/* Find the netmask that would be inferred by RIPv1 listeners
* on the given interface for a given network.
* If no interface is specified, look for the best fitting interface.
*/
naddr
ripv1_mask_net(naddr addr, /* in network byte order */
struct interface *ifp) /* as seen on this interface */
{
struct r1net *r1p;
naddr mask = 0;
if (addr == 0) /* default always has 0 mask */
return mask;
if (ifp != NULL && ifp->int_ripv1_mask != HOST_MASK) {
/* If the target network is that of the associated interface
* on which it arrived, then use the netmask of the interface.
*/
if (on_net(addr, ifp->int_net, ifp->int_std_mask))
mask = ifp->int_ripv1_mask;
} else {
/* Examine all interfaces, and if it the target seems
* to have the same network number of an interface, use the
* netmask of that interface. If there is more than one
* such interface, prefer the interface with the longest
* match.
*/
LIST_FOREACH(ifp, &ifnet, int_list) {
if (on_net(addr, ifp->int_std_net, ifp->int_std_mask)
&& ifp->int_ripv1_mask > mask
&& ifp->int_ripv1_mask != HOST_MASK)
mask = ifp->int_ripv1_mask;
}
}
/* check special definitions */
if (mask == 0) {
for (r1p = r1nets; r1p != NULL; r1p = r1p->r1net_next) {
if (on_net(addr, r1p->r1net_net, r1p->r1net_match)
&& r1p->r1net_mask > mask)
mask = r1p->r1net_mask;
}
/* Otherwise, make the classic A/B/C guess.
*/
if (mask == 0)
mask = std_mask(addr);
}
return mask;
}
naddr
ripv1_mask_host(naddr addr, /* in network byte order */
struct interface *ifp) /* as seen on this interface */
{
naddr mask = ripv1_mask_net(addr, ifp);
/* If the computed netmask does not mask the address,
* then assume it is a host address
*/
if ((ntohl(addr) & ~mask) != 0)
mask = HOST_MASK;
return mask;
}
/* See if an IP address looks reasonable as a destination.
*/
int /* 0=bad */
check_dst(naddr addr)
{
addr = ntohl(addr);
if (IN_CLASSA(addr)) {
if (addr == 0)
return 1; /* default */
addr >>= IN_CLASSA_NSHIFT;
return (addr != 0 && addr != IN_LOOPBACKNET);
}
return (IN_CLASSB(addr) || IN_CLASSC(addr));
}
/* See a new interface duplicates an existing interface.
*/
struct interface *
check_dup(naddr addr, /* IP address, so network byte order */
naddr dstaddr, /* ditto */
naddr mask, /* mask, so host byte order */
int if_flags)
{
struct interface *ifp;
LIST_FOREACH(ifp, &ifnet, int_list) {
if (ifp->int_mask != mask)
continue;
if (!iff_up(ifp->int_if_flags))
continue;
/* The local address can only be shared with a point-to-point
* link.
*/
if ((!(ifp->int_state & IS_REMOTE) || !(if_flags & IS_REMOTE))
&& ifp->int_addr == addr
&& (((if_flags|ifp->int_if_flags) & IFF_POINTOPOINT) == 0))
return ifp;
if (on_net(ifp->int_dstaddr, ntohl(dstaddr),mask))
return ifp;
}
return 0;
}
/* See that a remote gateway is reachable.
* Note that the answer can change as real interfaces come and go.
*/
int /* 0=bad */
check_remote(struct interface *ifp)
{
struct rt_entry *rt;
/* do not worry about other kinds */
if (!(ifp->int_state & IS_REMOTE))
return 1;
rt = rtfind(ifp->int_addr);
if (rt != NULL
&& rt->rt_ifp != 0
&&on_net(ifp->int_addr,
rt->rt_ifp->int_net, rt->rt_ifp->int_mask))
return 1;
/* the gateway cannot be reached directly from one of our
* interfaces
*/
if (!(ifp->int_state & IS_BROKE)) {
msglog("unreachable gateway %s in "_PATH_GATEWAYS,
naddr_ntoa(ifp->int_addr));
if_bad(ifp);
}
return 0;
}
/* Delete an interface.
*/
static void
ifdel(struct interface *ifp)
{
struct interface *ifp1;
trace_if("Del", ifp);
ifp->int_state |= IS_BROKE;
LIST_REMOVE(ifp, int_list);
*ifp->int_ahash_prev = ifp->int_ahash;
if (ifp->int_ahash != 0)
ifp->int_ahash->int_ahash_prev = ifp->int_ahash_prev;
*ifp->int_nhash_prev = ifp->int_nhash;
if (ifp->int_nhash != 0)
ifp->int_nhash->int_nhash_prev = ifp->int_nhash_prev;
if (ifp->int_if_flags & IFF_BROADCAST) {
*ifp->int_bhash_prev = ifp->int_bhash;
if (ifp->int_bhash != 0)
ifp->int_bhash->int_bhash_prev = ifp->int_bhash_prev;
}
if (ifp->int_state & IS_REMOTE)
LIST_REMOVE(ifp, remote_list);
if (!(ifp->int_state & IS_ALIAS)) {
/* delete aliases when the main interface dies
*/
LIST_FOREACH(ifp1, &ifnet, int_list) {
if (ifp1 != ifp
&& !strcmp(ifp->int_name, ifp1->int_name))
ifdel(ifp1);
}
if ((ifp->int_if_flags & IFF_MULTICAST) && rip_sock >= 0) {
struct group_req gr;
struct sockaddr_in *sin;
memset(&gr, 0, sizeof(gr));
gr.gr_interface = ifp->int_index;
sin = (struct sockaddr_in *)&gr.gr_group;
sin->sin_family = AF_INET;
#ifdef _HAVE_SIN_LEN
sin->sin_len = sizeof(struct sockaddr_in);
#endif
sin->sin_addr.s_addr = htonl(INADDR_RIP_GROUP);
if (setsockopt(rip_sock, IPPROTO_IP, MCAST_LEAVE_GROUP,
&gr, sizeof(gr)) < 0
&& errno != EADDRNOTAVAIL
&& !TRACEACTIONS)
LOGERR("setsockopt(MCAST_LEAVE_GROUP RIP)");
if (rip_sock_mcast == ifp)
rip_sock_mcast = NULL;
}
if (ifp->int_rip_sock >= 0) {
(void)close(ifp->int_rip_sock);
ifp->int_rip_sock = -1;
fix_select();
}
tot_interfaces--;
if (!IS_RIP_OFF(ifp->int_state))
rip_interfaces--;
/* Zap all routes associated with this interface.
* Assume routes just using gateways beyond this interface
* will timeout naturally, and have probably already died.
*/
(void)rn_walktree(rhead, walk_bad, 0);
set_rdisc_mg(ifp, 0);
if_bad_rdisc(ifp);
}
free(ifp);
}
/* Mark an interface ill.
*/
void
if_sick(struct interface *ifp)
{
if (0 == (ifp->int_state & (IS_SICK | IS_BROKE))) {
ifp->int_state |= IS_SICK;
ifp->int_act_time = NEVER;
trace_if("Chg", ifp);
LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
}
}
/* Mark an interface dead.
*/
static void
if_bad(struct interface *ifp)
{
struct interface *ifp1;
if (ifp->int_state & IS_BROKE)
return;
LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
ifp->int_state |= (IS_BROKE | IS_SICK);
ifp->int_act_time = NEVER;
ifp->int_query_time = NEVER;
ifp->int_data.ts = now.tv_sec;
trace_if("Chg", ifp);
if (!(ifp->int_state & IS_ALIAS)) {
LIST_FOREACH(ifp1, &ifnet, int_list) {
if (ifp1 != ifp
&& !strcmp(ifp->int_name, ifp1->int_name))
if_bad(ifp1);
}
(void)rn_walktree(rhead, walk_bad, 0);
if_bad_rdisc(ifp);
}
}
/* Mark an interface alive
*/
int /* 1=it was dead */
if_ok(struct interface *ifp,
const char *type)
{
struct interface *ifp1;
if (!(ifp->int_state & IS_BROKE)) {
if (ifp->int_state & IS_SICK) {
trace_act("%sinterface %s to %s working better",
type,
ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
ifp->int_state &= ~IS_SICK;
}
return 0;
}
msglog("%sinterface %s to %s restored",
type, ifp->int_name, naddr_ntoa(ifp->int_dstaddr));
ifp->int_state &= ~(IS_BROKE | IS_SICK);
ifp->int_data.ts = 0;
if (!(ifp->int_state & IS_ALIAS)) {
LIST_FOREACH(ifp1, &ifnet, int_list) {
if (ifp1 != ifp
&& !strcmp(ifp->int_name, ifp1->int_name))
if_ok(ifp1, type);
}
if_ok_rdisc(ifp);
}
if (ifp->int_state & IS_REMOTE) {
if (!addrouteforif(ifp))
return 0;
}
return 1;
}
/* disassemble routing message
*/
void
rt_xaddrs(struct rt_addrinfo *info,
struct sockaddr *sa,
struct sockaddr *lim,
int addrs)
{
int i;
#ifdef _HAVE_SA_LEN
static struct sockaddr sa_zero;
#endif
memset(info, 0, sizeof(*info));
info->rti_addrs = addrs;
for (i = 0; i < RTAX_MAX && sa < lim; i++) {
if ((addrs & (1 << i)) == 0)
continue;
info->rti_info[i] = (sa->sa_len != 0) ? sa : &sa_zero;
sa = (struct sockaddr *)((char*)(sa) + SA_SIZE(sa));
}
}
/* Find the network interfaces which have configured themselves.
* This must be done regularly, if only for extra addresses
* that come and go on interfaces.
*/
void
ifinit(void)
{
static struct ifa_msghdr *sysctl_buf;
static size_t sysctl_buf_size = 0;
uint complaints = 0;
static u_int prev_complaints = 0;
# define COMP_NOT_INET 0x001
# define COMP_NOADDR 0x002
# define COMP_BADADDR 0x004
# define COMP_NODST 0x008
# define COMP_NOBADR 0x010
# define COMP_NOMASK 0x020
# define COMP_DUP 0x040
# define COMP_BAD_METRIC 0x080
# define COMP_NETMASK 0x100
struct interface ifs, ifs0, *ifp, *ifp1;
struct rt_entry *rt;
size_t needed;
int mib[6];
struct if_msghdr *ifm;
void *ifam_lim;
struct ifa_msghdr *ifam, *ifam2;
int in, ierr, out, oerr;
struct intnet *intnetp;
struct rt_addrinfo info;
#ifdef SIOCGIFMETRIC
struct ifreq ifr;
#endif
last_ifinit = now;
ifinit_timer.tv_sec = now.tv_sec + (supplier
? CHECK_ACT_INTERVAL
: CHECK_QUIET_INTERVAL);
/* mark all interfaces so we can get rid of those that disappear */
LIST_FOREACH(ifp, &ifnet, int_list)
ifp->int_state &= ~(IS_CHECKED | IS_DUP);
/* Fetch the interface list, without too many system calls
* since we do it repeatedly.
*/
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
for (;;) {
if ((needed = sysctl_buf_size) != 0) {
if (sysctl(mib, 6, sysctl_buf,&needed, 0, 0) >= 0)
break;
/* retry if the table grew */
if (errno != ENOMEM && errno != EFAULT)
BADERR(1, "ifinit: sysctl(RT_IFLIST)");
free(sysctl_buf);
needed = 0;
}
if (sysctl(mib, 6, 0, &needed, 0, 0) < 0)
BADERR(1,"ifinit: sysctl(RT_IFLIST) estimate");
sysctl_buf = rtmalloc(sysctl_buf_size = needed,
"ifinit sysctl");
}
/* XXX: thanks to malloc(3), alignment can be presumed OK */
ifam_lim = (char *)sysctl_buf + needed;
for (ifam = sysctl_buf; (void *)ifam < ifam_lim; ifam = ifam2) {
ifam2 = (struct ifa_msghdr*)((char*)ifam + ifam->ifam_msglen);
#ifdef RTM_OIFINFO
if (ifam->ifam_type == RTM_OIFINFO)
continue; /* just ignore compat message */
#endif
if (ifam->ifam_type == RTM_IFINFO) {
struct sockaddr_dl *sdl;
ifm = (struct if_msghdr *)ifam;
/* make prototype structure for the IP aliases
*/
memset(&ifs0, 0, sizeof(ifs0));
ifs0.int_rip_sock = -1;
ifs0.int_index = ifm->ifm_index;
ifs0.int_if_flags = ifm->ifm_flags;
ifs0.int_state = IS_CHECKED;
ifs0.int_query_time = NEVER;
ifs0.int_act_time = now.tv_sec;
ifs0.int_data.ts = now.tv_sec;
ifs0.int_data.ipackets = ifm->ifm_data.ifi_ipackets;
ifs0.int_data.ierrors = ifm->ifm_data.ifi_ierrors;
ifs0.int_data.opackets = ifm->ifm_data.ifi_opackets;
ifs0.int_data.oerrors = ifm->ifm_data.ifi_oerrors;
#ifdef sgi
ifs0.int_data.odrops = ifm->ifm_data.ifi_odrops;
#endif
sdl = (struct sockaddr_dl *)(ifm + 1);
sdl->sdl_data[sdl->sdl_nlen] = 0;
strncpy(ifs0.int_name, sdl->sdl_data,
MIN(sizeof(ifs0.int_name), sdl->sdl_nlen));
continue;
}
if (ifam->ifam_type != RTM_NEWADDR) {
logbad(1,"ifinit: out of sync");
continue;
}
rt_xaddrs(&info, (struct sockaddr *)(ifam+1),
(struct sockaddr *)ifam2,
ifam->ifam_addrs);
/* Prepare for the next address of this interface, which
* will be an alias.
* Do not output RIP or Router-Discovery packets via aliases.
*/
memcpy(&ifs, &ifs0, sizeof(ifs));
ifs0.int_state |= (IS_ALIAS | IS_NO_RIP_OUT | IS_NO_RDISC);
if (INFO_IFA(&info) == 0) {
if (iff_up(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NOADDR))
msglog("%s has no address",
ifs.int_name);
complaints |= COMP_NOADDR;
}
continue;
}
if (INFO_IFA(&info)->sa_family != AF_INET) {
if (iff_up(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NOT_INET))
trace_act("%s: not AF_INET",
ifs.int_name);
complaints |= COMP_NOT_INET;
}
continue;
}
ifs.int_addr = S_ADDR(INFO_IFA(&info));
if (ntohl(ifs.int_addr)>>24 == 0
|| ntohl(ifs.int_addr)>>24 == 0xff) {
if (iff_up(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_BADADDR))
msglog("%s has a bad address",
ifs.int_name);
complaints |= COMP_BADADDR;
}
continue;
}
if (ifs.int_if_flags & IFF_LOOPBACK) {
ifs.int_state |= IS_NO_RIP | IS_NO_RDISC;
if (ifs.int_addr == htonl(INADDR_LOOPBACK))
ifs.int_state |= IS_PASSIVE;
ifs.int_dstaddr = ifs.int_addr;
ifs.int_mask = HOST_MASK;
ifs.int_ripv1_mask = HOST_MASK;
ifs.int_std_mask = std_mask(ifs.int_dstaddr);
ifs.int_net = ntohl(ifs.int_dstaddr);
if (!foundloopback) {
foundloopback = 1;
loopaddr = ifs.int_addr;
loop_rts.rts_gate = loopaddr;
loop_rts.rts_router = loopaddr;
}
} else if (ifs.int_if_flags & IFF_POINTOPOINT) {
if (INFO_BRD(&info) == 0
|| INFO_BRD(&info)->sa_family != AF_INET) {
if (iff_up(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NODST))
msglog("%s has a bad"
" destination address",
ifs.int_name);
complaints |= COMP_NODST;
}
continue;
}
ifs.int_dstaddr = S_ADDR(INFO_BRD(&info));
if (ntohl(ifs.int_dstaddr)>>24 == 0
|| ntohl(ifs.int_dstaddr)>>24 == 0xff) {
if (iff_up(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NODST))
msglog("%s has a bad"
" destination address",
ifs.int_name);
complaints |= COMP_NODST;
}
continue;
}
ifs.int_mask = HOST_MASK;
ifs.int_ripv1_mask = ntohl(S_ADDR(INFO_MASK(&info)));
ifs.int_std_mask = std_mask(ifs.int_dstaddr);
ifs.int_net = ntohl(ifs.int_dstaddr);
} else {
if (INFO_MASK(&info) == 0) {
if (iff_up(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NOMASK))
msglog("%s has no netmask",
ifs.int_name);
complaints |= COMP_NOMASK;
}
continue;
}
ifs.int_dstaddr = ifs.int_addr;
ifs.int_mask = ntohl(S_ADDR(INFO_MASK(&info)));
ifs.int_ripv1_mask = ifs.int_mask;
ifs.int_std_mask = std_mask(ifs.int_addr);
ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask;
if (ifs.int_mask != ifs.int_std_mask)
ifs.int_state |= IS_SUBNET;
if (ifs.int_if_flags & IFF_BROADCAST) {
if (INFO_BRD(&info) == 0) {
if (iff_up(ifs.int_if_flags)) {
if (!(prev_complaints
& COMP_NOBADR))
msglog("%s has"
"no broadcast address",
ifs.int_name);
complaints |= COMP_NOBADR;
}
continue;
}
ifs.int_brdaddr = S_ADDR(INFO_BRD(&info));
}
}
ifs.int_std_net = ifs.int_net & ifs.int_std_mask;
ifs.int_std_addr = htonl(ifs.int_std_net);
/* Use a minimum metric of one. Treat the interface metric
* (default 0) as an increment to the hop count of one.
*
* The metric obtained from the routing socket dump of
* interface addresses is wrong. It is not set by the
* SIOCSIFMETRIC ioctl.
*/
#ifdef SIOCGIFMETRIC
strncpy(ifr.ifr_name, ifs.int_name, sizeof(ifr.ifr_name));
if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) {
DBGERR(1, "ioctl(SIOCGIFMETRIC)");
ifs.int_metric = 0;
} else {
ifs.int_metric = ifr.ifr_metric;
}
#else
ifs.int_metric = ifam->ifam_metric;
#endif
if (ifs.int_metric > HOPCNT_INFINITY) {
ifs.int_metric = 0;
if (!(prev_complaints & COMP_BAD_METRIC)
&& iff_up(ifs.int_if_flags)) {
complaints |= COMP_BAD_METRIC;
msglog("%s has a metric of %d",
ifs.int_name, ifs.int_metric);
}
}
/* See if this is a familiar interface.
* If so, stop worrying about it if it is the same.
* Start it over if it now is to somewhere else, as happens
* frequently with PPP and SLIP.
*/
ifp = ifwithname(ifs.int_name, ((ifs.int_state & IS_ALIAS)
? ifs.int_addr
: 0));
if (ifp != NULL) {
ifp->int_state |= IS_CHECKED;
if (0 != ((ifp->int_if_flags ^ ifs.int_if_flags)
& (IFF_BROADCAST
| IFF_LOOPBACK
| IFF_POINTOPOINT
| IFF_MULTICAST))
|| 0 != ((ifp->int_state ^ ifs.int_state)
& IS_ALIAS)
|| ifp->int_addr != ifs.int_addr
|| ifp->int_brdaddr != ifs.int_brdaddr
|| ifp->int_dstaddr != ifs.int_dstaddr
|| ifp->int_mask != ifs.int_mask
|| ifp->int_metric != ifs.int_metric) {
/* Forget old information about
* a changed interface.
*/
trace_act("interface %s has changed",
ifp->int_name);
ifdel(ifp);
ifp = NULL;
}
}
if (ifp != NULL) {
/* The primary representative of an alias worries
* about how things are working.
*/
if (ifp->int_state & IS_ALIAS)
continue;
/* note interfaces that have been turned off
*/
if (!iff_up(ifs.int_if_flags)) {
if (iff_up(ifp->int_if_flags)) {
msglog("interface %s to %s turned off",
ifp->int_name,
naddr_ntoa(ifp->int_dstaddr));
if_bad(ifp);
ifp->int_if_flags &= ~IFF_UP;
} else if (now.tv_sec>(ifp->int_data.ts
+ CHECK_BAD_INTERVAL)) {
trace_act("interface %s has been off"
" %jd seconds; forget it",
ifp->int_name,
(intmax_t)now.tv_sec -
ifp->int_data.ts);
ifdel(ifp);
ifp = NULL;
}
continue;
}
/* or that were off and are now ok */
if (!iff_up(ifp->int_if_flags)) {
ifp->int_if_flags |= IFF_UP;
(void)if_ok(ifp, "");
}
/* If it has been long enough,
* see if the interface is broken.
*/
if (now.tv_sec < ifp->int_data.ts+CHECK_BAD_INTERVAL)
continue;
in = ifs.int_data.ipackets - ifp->int_data.ipackets;
ierr = ifs.int_data.ierrors - ifp->int_data.ierrors;
out = ifs.int_data.opackets - ifp->int_data.opackets;
oerr = ifs.int_data.oerrors - ifp->int_data.oerrors;
#ifdef sgi
/* Through at least IRIX 6.2, PPP and SLIP
* count packets dropped by the filters.
* But FDDI rings stuck non-operational count
* dropped packets as they wait for improvement.
*/
if (!(ifp->int_if_flags & IFF_POINTOPOINT))
oerr += (ifs.int_data.odrops
- ifp->int_data.odrops);
#endif
/* If the interface just awoke, restart the counters.
*/
if (ifp->int_data.ts == 0) {
ifp->int_data = ifs.int_data;
continue;
}
ifp->int_data = ifs.int_data;
/* Withhold judgment when the short error
* counters wrap or the interface is reset.
*/
if (ierr < 0 || in < 0 || oerr < 0 || out < 0) {
LIM_SEC(ifinit_timer,
now.tv_sec+CHECK_BAD_INTERVAL);
continue;
}
/* Withhold judgement when there is no traffic
*/
if (in == 0 && out == 0 && ierr == 0 && oerr == 0)
continue;
/* It is bad if input or output is not working.
* Require presistent problems before marking it dead.
*/
if ((in <= ierr && ierr > 0)
|| (out <= oerr && oerr > 0)) {
if (!(ifp->int_state & IS_SICK)) {
trace_act("interface %s to %s"
" sick: in=%d ierr=%d"
" out=%d oerr=%d",
ifp->int_name,
naddr_ntoa(ifp->int_dstaddr),
in, ierr, out, oerr);
if_sick(ifp);
continue;
}
if (!(ifp->int_state & IS_BROKE)) {
msglog("interface %s to %s broken:"
" in=%d ierr=%d out=%d oerr=%d",
ifp->int_name,
naddr_ntoa(ifp->int_dstaddr),
in, ierr, out, oerr);
if_bad(ifp);
}
continue;
}
/* otherwise, it is active and healthy
*/
ifp->int_act_time = now.tv_sec;
(void)if_ok(ifp, "");
continue;
}
/* This is a new interface.
* If it is dead, forget it.
*/
if (!iff_up(ifs.int_if_flags))
continue;
/* If it duplicates an existing interface,
* complain about it, mark the other one
* duplicated, and forget this one.
*/
ifp = check_dup(ifs.int_addr,ifs.int_dstaddr,ifs.int_mask,
ifs.int_if_flags);
if (ifp != NULL) {
/* Ignore duplicates of itself, caused by having
* IP aliases on the same network.
*/
if (!strcmp(ifp->int_name, ifs.int_name))
continue;
if (!(prev_complaints & COMP_DUP)) {
complaints |= COMP_DUP;
msglog("%s (%s%s%s) is duplicated by"
" %s (%s%s%s)",
ifs.int_name,
addrname(ifs.int_addr,ifs.int_mask,1),
((ifs.int_if_flags & IFF_POINTOPOINT)
? "-->" : ""),
((ifs.int_if_flags & IFF_POINTOPOINT)
? naddr_ntoa(ifs.int_dstaddr) : ""),
ifp->int_name,
addrname(ifp->int_addr,ifp->int_mask,1),
((ifp->int_if_flags & IFF_POINTOPOINT)
? "-->" : ""),
((ifp->int_if_flags & IFF_POINTOPOINT)
? naddr_ntoa(ifp->int_dstaddr) : ""));
}
ifp->int_state |= IS_DUP;
continue;
}
if (0 == (ifs.int_if_flags & (IFF_POINTOPOINT | IFF_BROADCAST | IFF_LOOPBACK))) {
trace_act("%s is neither broadcast, point-to-point,"
" nor loopback",
ifs.int_name);
if (!(ifs.int_state & IFF_MULTICAST))
ifs.int_state |= IS_NO_RDISC;
}
/* It is new and ok. Add it to the list of interfaces
*/
ifp = (struct interface *)rtmalloc(sizeof(*ifp), "ifinit ifp");
memcpy(ifp, &ifs, sizeof(*ifp));
get_parms(ifp);
if_link(ifp);
trace_if("Add", ifp);
/* Notice likely bad netmask.
*/
if (!(prev_complaints & COMP_NETMASK)
&& !(ifp->int_if_flags & IFF_POINTOPOINT)
&& ifp->int_addr != RIP_DEFAULT) {
LIST_FOREACH(ifp1, &ifnet, int_list) {
if (ifp1->int_mask == ifp->int_mask)
continue;
if (ifp1->int_if_flags & IFF_POINTOPOINT)
continue;
if (ifp1->int_dstaddr == RIP_DEFAULT)
continue;
/* ignore aliases on the right network */
if (!strcmp(ifp->int_name, ifp1->int_name))
continue;
if (on_net(ifp->int_dstaddr,
ifp1->int_net, ifp1->int_mask)
|| on_net(ifp1->int_dstaddr,
ifp->int_net, ifp->int_mask)) {
msglog("possible netmask problem"
" between %s:%s and %s:%s",
ifp->int_name,
addrname(htonl(ifp->int_net),
ifp->int_mask, 1),
ifp1->int_name,
addrname(htonl(ifp1->int_net),
ifp1->int_mask, 1));
complaints |= COMP_NETMASK;
}
}
}
if (!(ifp->int_state & IS_ALIAS)) {
/* Count the # of directly connected networks.
*/
if (!(ifp->int_if_flags & IFF_LOOPBACK))
tot_interfaces++;
if (!IS_RIP_OFF(ifp->int_state))
rip_interfaces++;
/* turn on router discovery and RIP If needed */
if_ok_rdisc(ifp);
rip_on(ifp);
}
}
/* If we are multi-homed and have at least two interfaces
* listening to RIP, then output by default.
*/
if (!supplier_set && rip_interfaces > 1)
set_supplier();
/* If we are multi-homed, optionally advertise a route to
* our main address.
*/
if ((advertise_mhome && ifp)
|| (tot_interfaces > 1
&& mhome
&& (ifp = ifwithaddr(myaddr, 0, 0)) != NULL
&& foundloopback)) {
advertise_mhome = 1;
rt = rtget(myaddr, HOST_MASK);
if (rt != NULL) {
if (rt->rt_ifp != ifp
|| rt->rt_router != loopaddr) {
rtdelete(rt);
rt = NULL;
} else {
loop_rts.rts_ifp = ifp;
loop_rts.rts_metric = 0;
loop_rts.rts_time = rt->rt_time;
rtchange(rt, rt->rt_state | RS_MHOME,
&loop_rts, 0);
}
}
if (rt == NULL) {
loop_rts.rts_ifp = ifp;
loop_rts.rts_metric = 0;
rtadd(myaddr, HOST_MASK, RS_MHOME, &loop_rts);
}
}
LIST_FOREACH_SAFE(ifp, &ifnet, int_list, ifp1) {
/* Forget any interfaces that have disappeared.
*/
if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) {
trace_act("interface %s has disappeared",
ifp->int_name);
ifdel(ifp);
continue;
}
if ((ifp->int_state & IS_BROKE)
&& !(ifp->int_state & IS_PASSIVE))
LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
/* If we ever have a RIPv1 interface, assume we always will.
* It might come back if it ever goes away.
*/
if (!(ifp->int_state & IS_NO_RIPV1_OUT) && supplier)
have_ripv1_out = 1;
if (!(ifp->int_state & IS_NO_RIPV1_IN))
have_ripv1_in = 1;
}
LIST_FOREACH(ifp, &ifnet, int_list) {
/* Ensure there is always a network route for interfaces,
* after any dead interfaces have been deleted, which
* might affect routes for point-to-point links.
*/
if (!addrouteforif(ifp))
continue;
/* Add routes to the local end of point-to-point interfaces
* using loopback.
*/
if ((ifp->int_if_flags & IFF_POINTOPOINT)
&& !(ifp->int_state & IS_REMOTE)
&& foundloopback) {
/* Delete any routes to the network address through
* foreign routers. Remove even static routes.
*/
del_static(ifp->int_addr, HOST_MASK, 0, 0);
rt = rtget(ifp->int_addr, HOST_MASK);
if (rt != NULL && rt->rt_router != loopaddr) {
rtdelete(rt);
rt = NULL;
}
if (rt != NULL) {
if (!(rt->rt_state & RS_LOCAL)
|| rt->rt_metric > ifp->int_metric) {
ifp1 = ifp;
} else {
ifp1 = rt->rt_ifp;
}
loop_rts.rts_ifp = ifp1;
loop_rts.rts_metric = 0;
loop_rts.rts_time = rt->rt_time;
rtchange(rt, ((rt->rt_state & ~RS_NET_SYN)
| (RS_IF|RS_LOCAL)),
&loop_rts, 0);
} else {
loop_rts.rts_ifp = ifp;
loop_rts.rts_metric = 0;
rtadd(ifp->int_addr, HOST_MASK,
(RS_IF | RS_LOCAL), &loop_rts);
}
}
}
/* add the authority routes */
for (intnetp = intnets; intnetp != NULL;
intnetp = intnetp->intnet_next) {
rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask);
if (rt != NULL
&& !(rt->rt_state & RS_NO_NET_SYN)
&& !(rt->rt_state & RS_NET_INT)) {
rtdelete(rt);
rt = NULL;
}
if (rt == NULL) {
loop_rts.rts_ifp = NULL;
loop_rts.rts_metric = intnetp->intnet_metric-1;
rtadd(intnetp->intnet_addr, intnetp->intnet_mask,
RS_NET_SYN | RS_NET_INT, &loop_rts);
}
}
prev_complaints = complaints;
}
static void
check_net_syn(struct interface *ifp)
{
struct rt_entry *rt;
static struct rt_spare new;
/* Turn on the need to automatically synthesize a network route
* for this interface only if we are running RIPv1 on some other
* interface that is on a different class-A,B,or C network.
*/
if (have_ripv1_out || have_ripv1_in) {
ifp->int_state |= IS_NEED_NET_SYN;
rt = rtget(ifp->int_std_addr, ifp->int_std_mask);
if (rt != NULL
&& 0 == (rt->rt_state & RS_NO_NET_SYN)
&& (!(rt->rt_state & RS_NET_SYN)
|| rt->rt_metric > ifp->int_metric)) {
rtdelete(rt);
rt = NULL;
}
if (rt == NULL) {
new.rts_ifp = ifp;
new.rts_gate = ifp->int_addr;
new.rts_router = ifp->int_addr;
new.rts_metric = ifp->int_metric;
rtadd(ifp->int_std_addr, ifp->int_std_mask,
RS_NET_SYN, &new);
}
} else {
ifp->int_state &= ~IS_NEED_NET_SYN;
rt = rtget(ifp->int_std_addr,
ifp->int_std_mask);
if (rt != NULL
&& (rt->rt_state & RS_NET_SYN)
&& rt->rt_ifp == ifp)
rtbad_sub(rt);
}
}
/* Add route for interface if not currently installed.
* Create route to other end if a point-to-point link,
* otherwise a route to this (sub)network.
*/
static int /* 0=bad interface */
addrouteforif(struct interface *ifp)
{
struct rt_entry *rt;
static struct rt_spare new;
naddr dst;
/* skip sick interfaces
*/
if (ifp->int_state & IS_BROKE)
return 0;
/* If the interface on a subnet, then install a RIPv1 route to
* the network as well (unless it is sick).
*/
if (ifp->int_state & IS_SUBNET)
check_net_syn(ifp);
dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK))
? ifp->int_dstaddr
: htonl(ifp->int_net));
new.rts_ifp = ifp;
new.rts_router = ifp->int_addr;
new.rts_gate = ifp->int_addr;
new.rts_metric = ifp->int_metric;
new.rts_time = now.tv_sec;
/* If we are going to send packets to the gateway,
* it must be reachable using our physical interfaces
*/
if ((ifp->int_state & IS_REMOTE)
&& !(ifp->int_state & IS_EXTERNAL)
&& !check_remote(ifp))
return 0;
/* We are finished if the correct main interface route exists.
* The right route must be for the right interface, not synthesized
* from a subnet, be a "gateway" or not as appropriate, and so forth.
*/
del_static(dst, ifp->int_mask, 0, 0);
rt = rtget(dst, ifp->int_mask);
if (rt != NULL) {
if ((rt->rt_ifp != ifp
|| rt->rt_router != ifp->int_addr)
&& (!(ifp->int_state & IS_DUP)
|| rt->rt_ifp == 0
|| (rt->rt_ifp->int_state & IS_BROKE))) {
rtdelete(rt);
rt = NULL;
} else {
rtchange(rt, ((rt->rt_state | RS_IF)
& ~(RS_NET_SYN | RS_LOCAL)),
&new, 0);
}
}
if (rt == NULL) {
if (ifp->int_transitions++ > 0)
trace_act("re-install interface %s",
ifp->int_name);
rtadd(dst, ifp->int_mask, RS_IF, &new);
}
return 1;
}
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