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freebsd-skq/usr.sbin/routed/if.c
Garrett Wollman 892201b43f Copy SGI routed onto head.
1996-05-30 16:31:46 +00:00

1076 lines
27 KiB
C
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/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char sccsid[] = "@(#)if.c 8.1 (Berkeley) 6/5/93";
#endif /* not lint */
#ident "$Revision: 1.1.3.1 $"
#include "defs.h"
#include "pathnames.h"
struct interface *ifnet; /* all interfaces */
int tot_interfaces; /* # of remote and local interfaces */
int rip_interfaces; /* # of interfaces doing RIP */
int foundloopback; /* valid flag for loopaddr */
naddr loopaddr; /* our address on loopback */
struct timeval ifinit_timer;
int have_ripv1; /* have a RIPv1 interface */
/* 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 = 0;
for (ifp = ifnet; ifp; ifp = ifp->int_next) {
if ((ifp->int_state & IS_REMOTE) && !remote)
continue;
if (ifp->int_addr == addr
|| ((ifp->int_if_flags & IFF_BROADCAST)
&& ifp->int_brdaddr == addr
&& bcast)) {
if (!(ifp->int_state & IS_BROKE))
return ifp;
possible = ifp;
}
}
return possible;
}
/* find the interface with a name
*/
struct interface *
ifwithname(char *name, /* enp0 or whatever */
naddr addr) /* 0 or network address */
{
struct interface *ifp;
for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
if (!strcmp(ifp->int_name, name)
&& ((addr == 0 && !(ifp->int_state & IS_ALIAS)
|| ifp->int_addr == addr)))
return ifp;
}
return 0;
}
struct interface *
ifwithindex(u_short index)
{
struct interface *ifp;
for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
if (ifp->int_index == index)
return ifp;
}
return 0;
}
/* Find an interface from which the specified address
* should have come from. Used for figuring out which
* interface a packet came in on -- for tracing.
*/
struct interface *
iflookup(naddr addr)
{
struct interface *ifp, *maybe;
int twice;
twice = 0;
maybe = 0;
do {
for (ifp = ifnet; ifp; ifp = ifp->int_next) {
/* finished with an exact match */
if (ifp->int_addr == addr)
return ifp;
if ((ifp->int_if_flags & IFF_BROADCAST)
&& ifp->int_brdaddr == addr)
return ifp;
if ((ifp->int_if_flags & IFF_POINTOPOINT)
&& ifp->int_dstaddr == addr)
return ifp;
/* Look for the longest approximate match.
*/
if (on_net(addr,
ifp->int_net, ifp->int_mask)
&& (maybe == 0
|| ifp->int_mask > maybe->int_mask))
maybe = ifp;
}
if (maybe != 0)
return maybe;
/* See if an interface has come up since we checked.
*/
ifinit();
} while (twice++ == 0);
return 0;
}
/* Return the classical netmask for an IP address.
*/
naddr
std_mask(naddr 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
*/
naddr
ripv1_mask_net(naddr addr, /* in network byte order */
struct interface *ifp1, /* as seen on this interface */
struct interface *ifp2) /* but not this interface */
{
naddr mask = 0;
if (addr == 0) /* default always has 0 mask */
return mask;
if (ifp1 != 0) {
/* If the target is that of the associated interface on which
* it arrived, then use the netmask of the interface.
*/
if (on_net(addr, ifp1->int_net, ifp1->int_std_mask))
mask = ifp1->int_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.
*/
for (ifp1 = ifnet; ifp1 != 0; ifp1 = ifp1->int_next) {
if (ifp1 != ifp2
&& !(ifp1->int_if_flags & IFF_POINTOPOINT)
&& on_net(addr,
ifp1->int_std_net, ifp1->int_std_mask)
&& ifp1->int_mask > mask)
mask = ifp1->int_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 *ifp1, /* as seen on this interface */
struct interface *ifp2) /* but not this interface */
{
naddr mask = ripv1_mask_net(addr, ifp1, ifp2);
/* 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 a IP address looks reasonable as a destination
*/
int /* 0=bad */
check_dst(naddr 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));
}
/* Delete an interface.
*/
static void
ifdel(struct interface *ifp)
{
struct ip_mreq m;
struct interface *ifp1;
if (TRACEACTIONS)
trace_if("Del", ifp);
if (!(ifp->int_state & IS_ALIAS)) {
if ((ifp->int_if_flags & IFF_MULTICAST)
#ifdef MCAST_PPP_BUG
&& !(ifp->int_if_flags & IFF_POINTOPOINT)
#endif
&& rip_sock >= 0) {
m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP);
m.imr_interface.s_addr = ((ifp->int_if_flags
& IFF_POINTOPOINT)
? ifp->int_dstaddr
: ifp->int_addr);
if (setsockopt(rip_sock,IPPROTO_IP,IP_DROP_MEMBERSHIP,
&m, sizeof(m)) < 0)
DBGERR(1,"setsockopt(IP_DROP_MEMBERSHIP"
" RIP)");
}
if (ifp->int_rip_sock >= 0) {
(void)close(ifp->int_rip_sock);
ifp->int_rip_sock = -1;
fix_select();
}
set_rdisc_mg(ifp, 0);
}
/* Zap all routes associated with this interface.
* Assume routes just using gateways beyond this interface will
* timeout naturally, and have probably already died.
*/
ifp->int_state |= IS_BROKE;
(void)rn_walktree(rhead, walk_bad, 0);
ifbad_rdisc(ifp);
if (!(ifp->int_state & IS_ALIAS)) {
tot_interfaces--;
if (0 == (ifp->int_state & (IS_NO_RIP_IN|IS_PASSIVE)))
rip_interfaces--;
}
/* unlink and forget the interface */
if (rip_sock_mcast == ifp)
rip_sock_mcast = 0;
if (ifp->int_next != 0)
ifp->int_next->int_prev = ifp->int_prev;
if (ifp->int_prev != 0)
ifp->int_prev->int_next = ifp->int_next;
else
ifnet = ifp->int_next;
if (!(ifp->int_state & IS_ALIAS)) {
/* delete aliases of primary interface */
for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) {
if (!strcmp(ifp->int_name, ifp1->int_name))
ifdel(ifp1);
}
}
free(ifp);
}
/* Mark an interface dead.
*/
void
ifbad(struct interface *ifp,
char *pat)
{
if (ifp->int_state & IS_BROKE)
return;
if (pat)
msglog(pat, ifp->int_name, naddr_ntoa(ifp->int_addr));
LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
ifp->int_state |= IS_BROKE;
ifp->int_state &= ~(IS_RIP_QUERIED | IS_ACTIVE | IS_QUIET);
ifp->int_quiet_time = now.tv_sec - MaxMaxAdvertiseInterval;
ifp->int_data_ts = 0;
trace_if("Chg", ifp);
(void)rn_walktree(rhead, walk_bad, 0);
ifbad_rdisc(ifp);
}
/* Mark an interface alive
*/
int /* 1=it was dead */
ifok(struct interface *ifp,
char *type)
{
if (!(ifp->int_state & IS_BROKE))
return 0;
msglog("%sinterface %s to %s restored",
type, ifp->int_name, naddr_ntoa(ifp->int_addr));
ifp->int_state &= ~IS_BROKE;
ifp->int_data_ts = 0;
ifok_rdisc(ifp);
return 1;
}
struct rt_addrinfo rtinfo;
/* disassemble routing message
*/
void
rt_xaddrs(struct sockaddr *sa,
struct sockaddr *lim,
int addrs)
{
int i;
#ifdef _HAVE_SA_LEN
static struct sockaddr sa_zero;
#endif
#ifdef sgi
#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) \
: sizeof(__uint64_t))
#else
#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
: sizeof(long))
#endif
bzero(rtinfo.rti_info, sizeof(rtinfo.rti_info));
rtinfo.rti_addrs = addrs;
for (i = 0; i < RTAX_MAX && sa < lim; i++) {
if ((addrs & (1 << i)) == 0)
continue;
#ifdef _HAVE_SA_LEN
rtinfo.rti_info[i] = (sa->sa_len != 0) ? sa : &sa_zero;
sa = (struct sockaddr *)((char*)(sa)
+ ROUNDUP(sa->sa_len));
#else
rtinfo.rti_info[i] = sa;
sa = (struct sockaddr *)((char*)(sa)
+ ROUNDUP(_FAKE_SA_LEN_DST(sa)));
#endif
}
}
/* 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 char *sysctl_buf;
static size_t sysctl_buf_size = 0;
uint complaints = 0;
static u_int prev_complaints = 0;
# define COMP_NOT_INET 0x01
# define COMP_WIERD 0x02
# define COMP_NOADDR 0x04
# define COMP_NODST 0x08
# define COMP_NOBADR 0x10
# define COMP_NOMASK 0x20
# define COMP_DUP 0x40
struct interface ifs, ifs0, *ifp, *ifp1;
struct rt_entry *rt;
size_t needed;
int mib[6];
struct if_msghdr *ifm;
struct ifa_msghdr *ifam, *ifam_lim, *ifam2;
struct sockaddr_dl *sdl;
int in, ierr, out, oerr;
struct intnet *intnetp;
#ifdef SIOCGIFMETRIC
struct ifreq ifr;
#endif
ifinit_timer.tv_sec = now.tv_sec + (supplier
? CHECK_ACT_INTERVAL
: CHECK_QUIET_INTERVAL);
/* mark all interfaces so we can get rid of thost that disappear */
for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next)
ifp->int_state &= ~IS_CHECKED;
/* 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;
if (errno != ENOMEM && errno != EFAULT)
BADERR(1, "ifinit: get interface table");
free(sysctl_buf);
needed = 0;
}
if (sysctl(mib, 6, 0, &needed, 0, 0) < 0)
BADERR(1,"ifinit: route-sysctl-estimate");
if ((sysctl_buf = malloc(sysctl_buf_size = needed)) == 0)
BADERR(1,"ifinit: malloc");
}
ifam_lim = (struct ifa_msghdr *)(sysctl_buf + needed);
for (ifam = (struct ifa_msghdr *)sysctl_buf;
ifam < ifam_lim;
ifam = ifam2) {
ifam2 = (struct ifa_msghdr*)((char*)ifam + ifam->ifam_msglen);
if (ifam->ifam_type == RTM_IFINFO) {
ifm = (struct if_msghdr *)ifam;
bzero(&ifs0, 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_act_time = now.tv_sec;
ifs0.int_quiet_time = (now.tv_sec
- MaxMaxAdvertiseInterval);
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;
continue;
}
if (ifam->ifam_type != RTM_NEWADDR) {
DBGERR(1,"ifinit: out of sync");
continue;
}
rt_xaddrs((struct sockaddr *)(ifam+1),
(struct sockaddr *)ifam2,
ifam->ifam_addrs);
if (RTINFO_IFA == 0) {
if (iff_alive(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NOADDR))
msglog("%s has a bad address",
sdl->sdl_data);
complaints |= COMP_NOADDR;
}
continue;
}
if (RTINFO_IFA->sa_family != AF_INET) {
if (iff_alive(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NOT_INET))
trace_msg("%s: not AF_INET",
sdl->sdl_data);
complaints |= COMP_NOT_INET;
}
continue;
}
bcopy(&ifs0, &ifs, sizeof(ifs0));
ifs0.int_state |= IS_ALIAS; /* next will be an alias */
ifs.int_addr = S_ADDR(RTINFO_IFA);
if (ifs.int_if_flags & IFF_BROADCAST) {
if (RTINFO_NETMASK == 0) {
if (iff_alive(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NOMASK))
msglog("%s has no netmask",
sdl->sdl_data);
complaints |= COMP_NOMASK;
}
continue;
}
ifs.int_mask = ntohl(S_ADDR(RTINFO_NETMASK));
ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask;
ifs.int_std_mask = std_mask(ifs.int_addr);
if (ifs.int_mask != ifs.int_std_mask)
ifs.int_state |= IS_SUBNET;
if (RTINFO_BRD == 0) {
if (iff_alive(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NOBADR))
msglog("%s has no"
" broadcast address",
sdl->sdl_data);
complaints |= COMP_NOBADR;
}
continue;
}
ifs.int_brdaddr = S_ADDR(RTINFO_BRD);
} else if (ifs.int_if_flags & IFF_POINTOPOINT) {
if (RTINFO_BRD == 0
|| RTINFO_BRD->sa_family != AF_INET) {
if (iff_alive(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_NODST))
msglog("%s has a bad"
" destination address",
sdl->sdl_data);
complaints |= COMP_NODST;
}
continue;
}
ifs.int_dstaddr = S_ADDR(RTINFO_BRD);
ifs.int_net = ntohl(ifs.int_dstaddr);
ifs.int_mask = HOST_MASK;
ifs.int_std_mask = std_mask(ifs.int_dstaddr);
} else if (ifs.int_if_flags & IFF_LOOPBACK) {
ifs.int_state |= IS_PASSIVE;
ifs.int_dstaddr = ifs.int_addr;
ifs.int_net = ntohl(ifs.int_dstaddr);
ifs.int_mask = HOST_MASK;
ifs.int_std_mask = std_mask(ifs.int_dstaddr);
if (!foundloopback) {
foundloopback = 1;
loopaddr = ifs.int_addr;
}
} else {
if (TRACEACTIONS
&& !(prev_complaints & COMP_WIERD))
msglog("%s is neither broadcast"
" nor point-to-point nor loopback",
sdl->sdl_data);
complaints |= COMP_WIERD;
continue;
}
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, sdl->sdl_data, sizeof(ifr.ifr_name));
if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) {
DBGERR(1, "ioctl(SIOCGIFMETRIC)");
ifs.int_metric = HOPCNT_INFINITY;
} else {
ifs.int_metric = ifr.ifr_metric+1;
}
#else
ifs.int_metric = ifam->ifam_metric+1;
#endif
if (ifs.int_metric >= HOPCNT_INFINITY)
ifs.int_metric = HOPCNT_INFINITY;
/* 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(sdl->sdl_data, ((ifs.int_state & IS_ALIAS)
? ifs.int_addr
: 0));
if (ifp != 0) {
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_msg("interface %s has changed",
ifp->int_name);
ifdel(ifp);
ifp = 0;
}
}
if (ifp != 0) {
/* note interfaces that have been turned off
*/
if (!iff_alive(ifs.int_if_flags)) {
if (iff_alive(ifp->int_if_flags))
ifbad(ifp, "interface %s to %s"
" turned off");
ifp->int_if_flags &= ~IFF_UP_RUNNING;
continue;
}
/* or that were off and are now ok */
if (!iff_alive(ifp->int_if_flags)) {
ifp->int_if_flags |= IFF_UP_RUNNING;
(void)ifok(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;
#ifdef sgi
oerr = (ifs.int_data_oerrors - ifp->int_data_oerrors
+ ifs.int_data_odrops - ifp->int_data_odrops);
#else
oerr = ifs.int_data_oerrors - ifp->int_data_oerrors;
#endif
ifp->int_data_ipackets = ifs.int_data_ipackets;
ifp->int_data_ierrors = ifs.int_data_ierrors;
ifp->int_data_opackets = ifs.int_data_opackets;
ifp->int_data_oerrors = ifs.int_data_oerrors;
#ifdef sgi
ifp->int_data_odrops = ifs.int_data_odrops;
#endif
/* If the interface just awoke, restart the counters.
*/
if (ifp->int_data_ts == 0) {
ifp->int_data_ts = now.tv_sec;
continue;
}
ifp->int_data_ts = now.tv_sec;
/* Withhold judgement when the short error
* counters wrap or the interface is reset.
*/
if (ierr < 0 || in < 0 || oerr < 0 || out < 0)
continue;
/* Withhold judgement when there is no traffic
*/
if (in == 0 && out == 0 && ierr == 0 && oerr == 0) {
if (!(ifp->int_state & IS_QUIET)) {
ifp->int_state |= IS_QUIET;
ifp->int_quiet_time = now.tv_sec;
}
continue;
}
/* It is bad if input or output is not working
*/
if ((in <= ierr && ierr > 0)
|| (out <= oerr && oerr > 0)) {
ifbad(ifp,"interface %s to %s not working");
continue;
}
/* otherwise, it is active and healthy
*/
ifp->int_act_time = now.tv_sec;
ifp->int_state &= ~IS_QUIET;
if (ifok(ifp, ""))
addrouteforif(ifp);
continue;
}
/* See if this new interface duplicates an existing
* interface.
*/
for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
if (ifp->int_addr == ifs.int_addr
&& ifp->int_mask == ifs.int_mask)
break;
}
if (ifp != 0) {
if (iff_alive(ifs.int_if_flags)) {
if (!(prev_complaints & COMP_DUP))
msglog("%s is duplicated by %s at %s",
sdl->sdl_data, ifp->int_name,
naddr_ntoa(ifp->int_addr));
complaints |= COMP_DUP;
}
continue;
}
strncpy(ifs.int_name, sdl->sdl_data,
MIN(sizeof(ifs.int_name)-1, sdl->sdl_nlen));
get_parms(&ifs);
ifok_rdisc(&ifs);
/* create the interface */
ifp = (struct interface *)malloc(sizeof(*ifp));
if (ifp == 0)
BADERR(1,"ifinit: out of memory");
bcopy(&ifs, ifp, sizeof(*ifp));
if (ifnet != 0) {
ifp->int_next = ifnet;
ifnet->int_prev = ifp;
}
ifnet = ifp;
/* Count the # of directly connected networks.
*/
if (!(ifp->int_state & IS_ALIAS)) {
if (!(ifp->int_if_flags & IFF_LOOPBACK))
tot_interfaces++;
if (0 == (ifp->int_state & (IS_NO_RIP_IN|IS_PASSIVE)))
rip_interfaces++;
}
/* note dead interfaces */
if (iff_alive(ifs.int_if_flags)) {
set_rdisc_mg(ifp, 1);
} else {
LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL);
ifp->int_state |= IS_BROKE;
}
if (TRACEACTIONS)
trace_if("Add", ifp);
rip_on(ifp);
}
/* If we are multi-homed and have at least one interface
* 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
|| (tot_interfaces > 1
&& mhome
&& (ifp = ifwithaddr(myaddr, 0, 0)) != 0
&& foundloopback)) {
advertise_mhome = 1;
del_static(myaddr, HOST_MASK, 0);
rt = rtget(myaddr, HOST_MASK);
if (rt != 0) {
if (rt->rt_ifp != ifp
|| rt->rt_router != loopaddr) {
rtdelete(rt);
rt = 0;
} else {
rtchange(rt, rt->rt_state | RS_MHOME,
loopaddr, loopaddr,
ifp->int_metric, 0,
ifp, rt->rt_time, 0);
}
}
if (rt == 0)
rtadd(myaddr, HOST_MASK, loopaddr, loopaddr,
ifp->int_metric, 0, RS_MHOME, ifp);
}
for (ifp = ifnet; ifp != 0; ifp = ifp1) {
ifp1 = ifp->int_next; /* because we may delete it */
/* Forget any interfaces that have disappeared.
*/
if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) {
trace_msg("interface %s has disappeared",
ifp->int_name);
ifdel(ifp);
continue;
}
if (ifp->int_state & IS_BROKE)
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_RIPV2_OUT)
&& !(ifp->int_if_flags & IFF_LOOPBACK))
have_ripv1 = 1;
}
/* add the authority interfaces */
for (intnetp = intnets; intnetp!=0; intnetp = intnetp->intnet_next) {
rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask);
if (rt != 0
&& !(rt->rt_state & RS_IF)
&& !(rt->rt_state & RS_NET_INT)) {
rtdelete(rt);
rt = 0;
}
if (rt == 0)
rtadd(intnetp->intnet_addr, intnetp->intnet_mask,
loopaddr, loopaddr,
1, 0, RS_NET_INT, 0);
}
for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
/* 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.
*/
addrouteforif(ifp);
/* 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);
rt = rtget(ifp->int_addr, HOST_MASK);
if (rt != 0 && rt->rt_router != loopaddr) {
rtdelete(rt);
rt = 0;
}
if (rt != 0) {
if (!(rt->rt_state & RS_LOCAL)
|| rt->rt_metric > ifp->int_metric) {
ifp1 = ifp;
} else {
ifp1 = rt->rt_ifp;
}
rtchange(rt,((rt->rt_state | (RS_IF|RS_LOCAL))
& ~RS_NET_S),
loopaddr, loopaddr,
ifp1->int_metric, 0,
ifp1, rt->rt_time, 0);
} else {
rtadd(ifp->int_addr, HOST_MASK,
loopaddr, loopaddr,
ifp->int_metric, 0,
(RS_IF | RS_LOCAL), ifp);
}
}
}
prev_complaints = complaints;
}
static void
add_net_sub(struct interface *ifp,
naddr dst,
naddr mask,
u_int state)
{
struct rt_entry *rt;
rt = rtget(dst, mask);
if (rt != 0) {
if (0 != (rt->rt_state & (RS_STATIC | RS_LOCAL
| RS_MHOME | RS_GW)))
return;
if ((rt->rt_state & state) != state
|| rt->rt_metric != NET_S_METRIC) {
rtchange(rt, rt->rt_state | state,
rt->rt_gate, rt->rt_router,
NET_S_METRIC, rt->rt_tag,
rt->rt_ifp, rt->rt_time, 0);
}
return;
}
rtadd(dst, mask, ifp->int_addr, ifp->int_addr,
NET_S_METRIC, 0, state, ifp);
}
static void
check_net_sub(struct interface *ifp)
{
struct interface *ifp2;
struct rt_entry *rt;
/* See if there are any RIPv1 listeners, to determine if
* we need to synthesize a network route for an interface
* on a subnet.
*/
for (ifp2 = ifnet; ifp2; ifp2 = ifp2->int_next) {
if (ifp2 != ifp
&& !(ifp->int_state & IS_PASSIVE)
&& !(ifp->int_state & IS_NO_RIPV1_OUT)
&& !on_net(ifp->int_addr,
ifp2->int_std_net,
ifp2->int_std_mask))
break;
}
/* only if running RIPv1 somewhere */
if (ifp2 != 0) {
ifp->int_state |= IS_NEED_NET_SUB;
add_net_sub(ifp, ifp->int_std_addr, ifp->int_std_mask,
RS_IF | RS_NET_SUB);
} else {
ifp->int_state &= ~IS_NEED_NET_SUB;
rt = rtget(ifp->int_std_addr,
ifp->int_std_mask);
if (rt != 0
&& 0 != (rt->rt_state & RS_NET_S)
&& 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.
*/
void
addrouteforif(struct interface *ifp)
{
struct rt_entry *rt;
naddr dst, mask;
/* skip sick interfaces
*/
if (ifp->int_state & IS_BROKE)
return;
/* If the interface on a subnet, then install a RIPv1 route to
* the network as well (unless it is sick).
*/
if (ifp->int_metric != HOPCNT_INFINITY
&& !(ifp->int_state & IS_PASSIVE)) {
if (ifp->int_state & IS_SUBNET) {
check_net_sub(ifp);
} else if ((ifp->int_if_flags & IFF_POINTOPOINT)
&& ridhosts) {
/* The (dis)appearance of other interfaces can change
* the parent (sub)net.
*/
mask = ripv1_mask_net(ifp->int_dstaddr,0,ifp);
if (mask != ifp->int_host_mask) {
rt = rtget(ifp->int_host_addr,
ifp->int_host_mask);
ifp->int_host_addr = htonl(ntohl(ifp->int_dstaddr)
& mask);
ifp->int_host_mask = mask;
if (rt != 0
&& (rt->rt_state & RS_NET_S)
&& rt->rt_ifp == ifp)
rtbad_sub(rt);
}
add_net_sub(ifp, ifp->int_host_addr,
ifp->int_host_mask,
RS_IF | RS_NET_HOST);
}
}
dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK))
? ifp->int_dstaddr
: htonl(ifp->int_net));
/* We are finished if the right, 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);
rt = rtget(dst, ifp->int_mask);
if (rt != 0) {
if (rt->rt_ifp != ifp
|| rt->rt_router != ifp->int_addr) {
rtdelete(rt);
rt = 0;
} else {
rtchange(rt, ((rt->rt_state | RS_IF)
& ~(RS_NET_S | RS_LOCAL)),
ifp->int_addr, ifp->int_addr,
ifp->int_metric, 0, ifp, now.tv_sec, 0);
}
}
if (rt == 0) {
if (ifp->int_transitions++ > 0)
trace_msg("re-install interface %s", ifp->int_name);
rtadd(dst, ifp->int_mask, ifp->int_addr, ifp->int_addr,
ifp->int_metric, 0, RS_IF, ifp);
}
}
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