d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
9a5e33be57
freebsd-skq/sbin/routed/output.c
Pedro F. Giffuni 5728318b35 Avoid NULL de-references. 
CID:		271079
Obtained from:	NetBSD
MFC after:	2 weeks.
2016-05-14 23:32:03 +00:00

975 lines
25 KiB
C
Raw Blame History

/*
* Copyright (c) 1983, 1988, 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.
* 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.
*
* $FreeBSD$
*/
#include "defs.h"
#ifdef __NetBSD__
__RCSID("$NetBSD$");
#elif defined(__FreeBSD__)
__RCSID("$FreeBSD$");
#else
__RCSID("$Revision: 2.27 $");
#ident "$Revision: 2.27 $"
#endif
u_int update_seqno;
/* walk the tree of routes with this for output
*/
static struct {
struct sockaddr_in to;
naddr to_mask;
naddr to_net;
naddr to_std_mask;
naddr to_std_net;
struct interface *ifp; /* usually output interface */
struct auth *a;
char metric; /* adjust metrics by interface */
int npackets;
int gen_limit;
u_int state;
#define WS_ST_FLASH 0x001 /* send only changed routes */
#define WS_ST_RIP2_ALL 0x002 /* send full featured RIPv2 */
#define WS_ST_AG 0x004 /* ok to aggregate subnets */
#define WS_ST_SUPER_AG 0x008 /* ok to aggregate networks */
#define WS_ST_QUERY 0x010 /* responding to a query */
#define WS_ST_TO_ON_NET 0x020 /* sending onto one of our nets */
#define WS_ST_DEFAULT 0x040 /* faking a default */
} ws;
/* A buffer for what can be heard by both RIPv1 and RIPv2 listeners */
struct ws_buf v12buf;
static union pkt_buf ripv12_buf;
/* Another for only RIPv2 listeners */
static struct ws_buf v2buf;
static union pkt_buf rip_v2_buf;
void
bufinit(void)
{
ripv12_buf.rip.rip_cmd = RIPCMD_RESPONSE;
v12buf.buf = &ripv12_buf.rip;
v12buf.base = &v12buf.buf->rip_nets[0];
rip_v2_buf.rip.rip_cmd = RIPCMD_RESPONSE;
rip_v2_buf.rip.rip_vers = RIPv2;
v2buf.buf = &rip_v2_buf.rip;
v2buf.base = &v2buf.buf->rip_nets[0];
}
/* Send the contents of the global buffer via the non-multicast socket
*/
int /* <0 on failure */
output(enum output_type type,
struct sockaddr_in *dst, /* send to here */
struct interface *ifp,
struct rip *buf,
int size) /* this many bytes */
{
struct sockaddr_in osin;
int flags;
const char *msg;
int res;
int soc;
int serrno;
assert(ifp != NULL);
osin = *dst;
if (osin.sin_port == 0)
osin.sin_port = htons(RIP_PORT);
#ifdef _HAVE_SIN_LEN
if (osin.sin_len == 0)
osin.sin_len = sizeof(osin);
#endif
soc = rip_sock;
flags = 0;
switch (type) {
case OUT_QUERY:
msg = "Answer Query";
if (soc < 0)
soc = ifp->int_rip_sock;
break;
case OUT_UNICAST:
msg = "Send";
if (soc < 0)
soc = ifp->int_rip_sock;
flags = MSG_DONTROUTE;
break;
case OUT_BROADCAST:
if (ifp->int_if_flags & IFF_POINTOPOINT) {
msg = "Send";
} else {
msg = "Send bcast";
}
flags = MSG_DONTROUTE;
break;
case OUT_MULTICAST:
if ((ifp->int_if_flags & (IFF_POINTOPOINT|IFF_MULTICAST)) ==
IFF_POINTOPOINT) {
msg = "Send pt-to-pt";
} else if (ifp->int_state & IS_DUP) {
trace_act("abort multicast output via %s"
" with duplicate address",
ifp->int_name);
return 0;
} else {
msg = "Send mcast";
if (rip_sock_mcast != ifp) {
struct ip_mreqn mreqn;
memset(&mreqn, 0, sizeof(struct ip_mreqn));
mreqn.imr_ifindex = ifp->int_index;
if (0 > setsockopt(rip_sock,
IPPROTO_IP,
IP_MULTICAST_IF,
&mreqn,
sizeof(mreqn))) {
serrno = errno;
LOGERR("setsockopt(rip_sock, "
"IP_MULTICAST_IF)");
errno = serrno;
ifp = NULL;
return -1;
}
rip_sock_mcast = ifp;
}
osin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP);
}
break;
case NO_OUT_MULTICAST:
case NO_OUT_RIPV2:
default:
#ifdef DEBUG
abort();
#endif
return -1;
}
trace_rip(msg, "to", &osin, ifp, buf, size);
res = sendto(soc, buf, size, flags,
(struct sockaddr *)&osin, sizeof(osin));
if (res < 0
&& (ifp == NULL || !(ifp->int_state & IS_BROKE))) {
serrno = errno;
msglog("%s sendto(%s%s%s.%d): %s", msg,
ifp != NULL ? ifp->int_name : "",
ifp != NULL ? ", " : "",
inet_ntoa(osin.sin_addr),
ntohs(osin.sin_port),
strerror(errno));
errno = serrno;
}
return res;
}
/* Find the first key for a packet to send.
* Try for a key that is eligible and has not expired, but settle for
* the last key if they have all expired.
* If no key is ready yet, give up.
*/
struct auth *
find_auth(struct interface *ifp)
{
struct auth *ap, *res;
int i;
if (ifp == NULL)
return 0;
res = NULL;
ap = ifp->int_auth;
for (i = 0; i < MAX_AUTH_KEYS; i++, ap++) {
/* stop looking after the last key */
if (ap->type == RIP_AUTH_NONE)
break;
/* ignore keys that are not ready yet */
if ((u_long)ap->start > (u_long)clk.tv_sec)
continue;
if ((u_long)ap->end < (u_long)clk.tv_sec) {
/* note best expired password as a fall-back */
if (res == NULL || (u_long)ap->end > (u_long)res->end)
res = ap;
continue;
}
/* note key with the best future */
if (res == NULL || (u_long)res->end < (u_long)ap->end)
res = ap;
}
return res;
}
void
clr_ws_buf(struct ws_buf *wb,
struct auth *ap)
{
struct netauth *na;
wb->lim = wb->base + NETS_LEN;
wb->n = wb->base;
memset(wb->n, 0, NETS_LEN*sizeof(*wb->n));
/* (start to) install authentication if appropriate
*/
if (ap == NULL)
return;
na = (struct netauth*)wb->n;
if (ap->type == RIP_AUTH_PW) {
na->a_family = RIP_AF_AUTH;
na->a_type = RIP_AUTH_PW;
memcpy(na->au.au_pw, ap->key, sizeof(na->au.au_pw));
wb->n++;
} else if (ap->type == RIP_AUTH_MD5) {
na->a_family = RIP_AF_AUTH;
na->a_type = RIP_AUTH_MD5;
na->au.a_md5.md5_keyid = ap->keyid;
na->au.a_md5.md5_auth_len = RIP_AUTH_MD5_KEY_LEN;
na->au.a_md5.md5_seqno = htonl(clk.tv_sec);
wb->n++;
wb->lim--; /* make room for trailer */
}
}
void
end_md5_auth(struct ws_buf *wb,
struct auth *ap)
{
struct netauth *na, *na2;
MD5_CTX md5_ctx;
int len;
na = (struct netauth*)wb->base;
na2 = (struct netauth*)wb->n;
len = (char *)na2-(char *)wb->buf;
na2->a_family = RIP_AF_AUTH;
na2->a_type = htons(1);
na->au.a_md5.md5_pkt_len = htons(len);
MD5Init(&md5_ctx);
MD5Update(&md5_ctx, (u_char *)wb->buf, len + RIP_AUTH_MD5_HASH_XTRA);
MD5Update(&md5_ctx, ap->key, RIP_AUTH_MD5_KEY_LEN);
MD5Final(na2->au.au_pw, &md5_ctx);
wb->n++;
}
/* Send the buffer
*/
static void
supply_write(struct ws_buf *wb)
{
/* Output multicast only if legal.
* If we would multicast and it would be illegal, then discard the
* packet.
*/
switch (wb->type) {
case NO_OUT_MULTICAST:
trace_pkt("skip multicast to %s because impossible",
naddr_ntoa(ws.to.sin_addr.s_addr));
break;
case NO_OUT_RIPV2:
break;
default:
if (ws.a != NULL && ws.a->type == RIP_AUTH_MD5)
end_md5_auth(wb,ws.a);
if (output(wb->type, &ws.to, ws.ifp, wb->buf,
((char *)wb->n - (char*)wb->buf)) < 0
&& ws.ifp != NULL)
if_sick(ws.ifp);
ws.npackets++;
break;
}
clr_ws_buf(wb,ws.a);
}
/* put an entry into the packet
*/
static void
supply_out(struct ag_info *ag)
{
int i;
naddr mask, v1_mask, dst_h, ddst_h = 0;
struct ws_buf *wb;
/* Skip this route if doing a flash update and it and the routes
* it aggregates have not changed recently.
*/
if (ag->ag_seqno < update_seqno
&& (ws.state & WS_ST_FLASH))
return;
dst_h = ag->ag_dst_h;
mask = ag->ag_mask;
v1_mask = ripv1_mask_host(htonl(dst_h),
(ws.state & WS_ST_TO_ON_NET) ? ws.ifp : 0);
i = 0;
/* If we are sending RIPv2 packets that cannot (or must not) be
* heard by RIPv1 listeners, do not worry about sub- or supernets.
* Subnets (from other networks) can only be sent via multicast.
* A pair of subnet routes might have been promoted so that they
* are legal to send by RIPv1.
* If RIPv1 is off, use the multicast buffer.
*/
if ((ws.state & WS_ST_RIP2_ALL)
|| ((ag->ag_state & AGS_RIPV2) && v1_mask != mask)) {
/* use the RIPv2-only buffer */
wb = &v2buf;
} else {
/* use the RIPv1-or-RIPv2 buffer */
wb = &v12buf;
/* Convert supernet route into corresponding set of network
* routes for RIPv1, but leave non-contiguous netmasks
* to ag_check().
*/
if (v1_mask > mask
&& mask + (mask & -mask) == 0) {
ddst_h = v1_mask & -v1_mask;
i = (v1_mask & ~mask)/ddst_h;
if (i > ws.gen_limit) {
/* Punt if we would have to generate an
* unreasonable number of routes.
*/
if (TRACECONTENTS)
trace_misc("sending %s-->%s as 1"
" instead of %d routes",
addrname(htonl(dst_h), mask,
1),
naddr_ntoa(ws.to.sin_addr
.s_addr),
i+1);
i = 0;
} else {
mask = v1_mask;
ws.gen_limit -= i;
}
}
}
do {
wb->n->n_family = RIP_AF_INET;
wb->n->n_dst = htonl(dst_h);
/* If the route is from router-discovery or we are
* shutting down, admit only a bad metric.
*/
wb->n->n_metric = ((stopint || ag->ag_metric < 1)
? HOPCNT_INFINITY
: ag->ag_metric);
wb->n->n_metric = htonl(wb->n->n_metric);
/* Any non-zero bits in the supposedly unused RIPv1 fields
* cause the old `routed` to ignore the route.
* That means the mask and so forth cannot be sent
* in the hybrid RIPv1/RIPv2 mode.
*/
if (ws.state & WS_ST_RIP2_ALL) {
if (ag->ag_nhop != 0
&& ((ws.state & WS_ST_QUERY)
|| (ag->ag_nhop != ws.ifp->int_addr
&& on_net(ag->ag_nhop,
ws.ifp->int_net,
ws.ifp->int_mask))))
wb->n->n_nhop = ag->ag_nhop;
wb->n->n_mask = htonl(mask);
wb->n->n_tag = ag->ag_tag;
}
dst_h += ddst_h;
if (++wb->n >= wb->lim)
supply_write(wb);
} while (i-- != 0);
}
/* supply one route from the table
*/
/* ARGSUSED */
static int
walk_supply(struct radix_node *rn,
struct walkarg *argp UNUSED)
{
#define RT ((struct rt_entry *)rn)
u_short ags;
char metric, pref;
naddr dst, nhop;
struct rt_spare *rts;
int i;
/* Do not advertise external remote interfaces or passive interfaces.
*/
if ((RT->rt_state & RS_IF)
&& RT->rt_ifp != 0
&& (RT->rt_ifp->int_state & IS_PASSIVE)
&& !(RT->rt_state & RS_MHOME))
return 0;
/* If being quiet about our ability to forward, then
* do not say anything unless responding to a query,
* except about our main interface.
*/
if (!supplier && !(ws.state & WS_ST_QUERY)
&& !(RT->rt_state & RS_MHOME))
return 0;
dst = RT->rt_dst;
/* do not collide with the fake default route */
if (dst == RIP_DEFAULT
&& (ws.state & WS_ST_DEFAULT))
return 0;
if (RT->rt_state & RS_NET_SYN) {
if (RT->rt_state & RS_NET_INT) {
/* Do not send manual synthetic network routes
* into the subnet.
*/
if (on_net(ws.to.sin_addr.s_addr,
ntohl(dst), RT->rt_mask))
return 0;
} else {
/* Do not send automatic synthetic network routes
* if they are not needed because no RIPv1 listeners
* can hear them.
*/
if (ws.state & WS_ST_RIP2_ALL)
return 0;
/* Do not send automatic synthetic network routes to
* the real subnet.
*/
if (on_net(ws.to.sin_addr.s_addr,
ntohl(dst), RT->rt_mask))
return 0;
}
nhop = 0;
} else {
/* Advertise the next hop if this is not a route for one
* of our interfaces and the next hop is on the same
* network as the target.
* The final determination is made by supply_out().
*/
if (!(RT->rt_state & RS_IF)
&& RT->rt_gate != myaddr
&& RT->rt_gate != loopaddr)
nhop = RT->rt_gate;
else
nhop = 0;
}
metric = RT->rt_metric;
ags = 0;
if (RT->rt_state & RS_MHOME) {
/* retain host route of multi-homed servers */
;
} else if (RT_ISHOST(RT)) {
/* We should always suppress (into existing network routes)
* the host routes for the local end of our point-to-point
* links.
* If we are suppressing host routes in general, then do so.
* Avoid advertising host routes onto their own network,
* where they should be handled by proxy-ARP.
*/
if ((RT->rt_state & RS_LOCAL)
|| ridhosts
|| on_net(dst, ws.to_net, ws.to_mask))
ags |= AGS_SUPPRESS;
/* Aggregate stray host routes into network routes if allowed.
* We cannot aggregate host routes into small network routes
* without confusing RIPv1 listeners into thinking the
* network routes are host routes.
*/
if ((ws.state & WS_ST_AG) && (ws.state & WS_ST_RIP2_ALL))
ags |= AGS_AGGREGATE;
} else {
/* Always suppress network routes into other, existing
* network routes
*/
ags |= AGS_SUPPRESS;
/* Generate supernets if allowed.
* If we can be heard by RIPv1 systems, we will
* later convert back to ordinary nets.
* This unifies dealing with received supernets.
*/
if ((ws.state & WS_ST_AG)
&& ((RT->rt_state & RS_SUBNET)
|| (ws.state & WS_ST_SUPER_AG)))
ags |= AGS_AGGREGATE;
}
/* Do not send RIPv1 advertisements of subnets to other
* networks. If possible, multicast them by RIPv2.
*/
if ((RT->rt_state & RS_SUBNET)
&& !(ws.state & WS_ST_RIP2_ALL)
&& !on_net(dst, ws.to_std_net, ws.to_std_mask))
ags |= AGS_RIPV2 | AGS_AGGREGATE;
/* Do not send a route back to where it came from, except in
* response to a query. This is "split-horizon". That means not
* advertising back to the same network and so via the same interface.
*
* We want to suppress routes that might have been fragmented
* from this route by a RIPv1 router and sent back to us, and so we
* cannot forget this route here. Let the split-horizon route
* suppress the fragmented routes and then itself be forgotten.
*
* Include the routes for both ends of point-to-point interfaces
* among those suppressed by split-horizon, since the other side
* should knows them as well as we do.
*
* Notice spare routes with the same metric that we are about to
* advertise, to split the horizon on redundant, inactive paths.
*
* Do not suppress advertisements of interface-related addresses on
* non-point-to-point interfaces. This ensures that we have something
* to say every 30 seconds to help detect broken Ethernets or
* other interfaces where one packet every 30 seconds costs nothing.
*/
if (ws.ifp != NULL
&& !(ws.state & WS_ST_QUERY)
&& (ws.state & WS_ST_TO_ON_NET)
&& (!(RT->rt_state & RS_IF)
|| ws.ifp->int_if_flags & IFF_POINTOPOINT)) {
for (rts = RT->rt_spares, i = NUM_SPARES; i != 0; i--, rts++) {
if (rts->rts_metric > metric
|| rts->rts_ifp != ws.ifp)
continue;
/* If we do not mark the route with AGS_SPLIT_HZ here,
* it will be poisoned-reverse, or advertised back
* toward its source with an infinite metric.
* If we have recently advertised the route with a
* better metric than we now have, then we should
* poison-reverse the route before suppressing it for
* split-horizon.
*
* In almost all cases, if there is no spare for the
* route then it is either old and dead or a brand
* new route. If it is brand new, there is no need
* for poison-reverse. If it is old and dead, it
* is already poisoned.
*/
if (RT->rt_poison_time < now_expire
|| RT->rt_poison_metric >= metric
|| RT->rt_spares[1].rts_gate == 0) {
ags |= AGS_SPLIT_HZ;
ags &= ~AGS_SUPPRESS;
}
metric = HOPCNT_INFINITY;
break;
}
}
/* Keep track of the best metric with which the
* route has been advertised recently.
*/
if (RT->rt_poison_metric >= metric
|| RT->rt_poison_time < now_expire) {
RT->rt_poison_time = now.tv_sec;
RT->rt_poison_metric = metric;
}
/* Adjust the outgoing metric by the cost of the link.
* Avoid aggregation when a route is counting to infinity.
*/
pref = RT->rt_poison_metric + ws.metric;
metric += ws.metric;
/* Do not advertise stable routes that will be ignored,
* unless we are answering a query.
* If the route recently was advertised with a metric that
* would have been less than infinity through this interface,
* we need to continue to advertise it in order to poison it.
*/
if (metric >= HOPCNT_INFINITY) {
if (!(ws.state & WS_ST_QUERY)
&& (pref >= HOPCNT_INFINITY
|| RT->rt_poison_time < now_garbage))
return 0;
metric = HOPCNT_INFINITY;
}
ag_check(dst, RT->rt_mask, 0, nhop, metric, pref,
RT->rt_seqno, RT->rt_tag, ags, supply_out);
return 0;
#undef RT
}
/* Supply dst with the contents of the routing tables.
* If this won't fit in one packet, chop it up into several.
*/
void
supply(struct sockaddr_in *dst,
struct interface *ifp, /* output interface */
enum output_type type,
int flash, /* 1=flash update */
int vers, /* RIP version */
int passwd_ok) /* OK to include cleartext password */
{
struct rt_entry *rt;
int def_metric;
ws.state = 0;
ws.gen_limit = 1024;
ws.to = *dst;
ws.to_std_mask = std_mask(ws.to.sin_addr.s_addr);
ws.to_std_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_std_mask;
if (ifp != NULL) {
ws.to_mask = ifp->int_mask;
ws.to_net = ifp->int_net;
if (on_net(ws.to.sin_addr.s_addr, ws.to_net, ws.to_mask))
ws.state |= WS_ST_TO_ON_NET;
} else {
ws.to_mask = ripv1_mask_net(ws.to.sin_addr.s_addr, 0);
ws.to_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_mask;
rt = rtfind(dst->sin_addr.s_addr);
if (rt)
ifp = rt->rt_ifp;
}
ws.npackets = 0;
if (flash)
ws.state |= WS_ST_FLASH;
if ((ws.ifp = ifp) == NULL) {
ws.metric = 1;
} else {
/* Adjust the advertised metric by the outgoing interface
* metric.
*/
ws.metric = ifp->int_metric + 1 + ifp->int_adj_outmetric;
}
ripv12_buf.rip.rip_vers = vers;
switch (type) {
case OUT_MULTICAST:
if (ifp != NULL && ifp->int_if_flags & IFF_MULTICAST)
v2buf.type = OUT_MULTICAST;
else
v2buf.type = NO_OUT_MULTICAST;
v12buf.type = OUT_BROADCAST;
break;
case OUT_QUERY:
ws.state |= WS_ST_QUERY;
/* FALLTHROUGH */
case OUT_BROADCAST:
case OUT_UNICAST:
v2buf.type = (vers == RIPv2) ? type : NO_OUT_RIPV2;
v12buf.type = type;
break;
case NO_OUT_MULTICAST:
case NO_OUT_RIPV2:
break; /* no output */
}
if (vers == RIPv2) {
/* full RIPv2 only if cannot be heard by RIPv1 listeners */
if (type != OUT_BROADCAST)
ws.state |= WS_ST_RIP2_ALL;
if ((ws.state & WS_ST_QUERY)
|| !(ws.state & WS_ST_TO_ON_NET)) {
ws.state |= (WS_ST_AG | WS_ST_SUPER_AG);
} else if (ifp == NULL || !(ifp->int_state & IS_NO_AG)) {
ws.state |= WS_ST_AG;
if (type != OUT_BROADCAST
&& (ifp == NULL
|| !(ifp->int_state & IS_NO_SUPER_AG)))
ws.state |= WS_ST_SUPER_AG;
}
}
ws.a = (vers == RIPv2) ? find_auth(ifp) : 0;
if (!passwd_ok && ws.a != NULL && ws.a->type == RIP_AUTH_PW)
ws.a = NULL;
clr_ws_buf(&v12buf,ws.a);
clr_ws_buf(&v2buf,ws.a);
/* Fake a default route if asked and if there is not already
* a better, real default route.
*/
if (supplier && ifp && (def_metric = ifp->int_d_metric) != 0) {
if ((rt = rtget(RIP_DEFAULT, 0)) == NULL
|| rt->rt_metric+ws.metric >= def_metric) {
ws.state |= WS_ST_DEFAULT;
ag_check(0, 0, 0, 0, def_metric, def_metric,
0, 0, 0, supply_out);
} else {
def_metric = rt->rt_metric+ws.metric;
}
/* If both RIPv2 and the poor-man's router discovery
* kludge are on, arrange to advertise an extra
* default route via RIPv1.
*/
if ((ws.state & WS_ST_RIP2_ALL)
&& (ifp->int_state & IS_PM_RDISC)) {
ripv12_buf.rip.rip_vers = RIPv1;
v12buf.n->n_family = RIP_AF_INET;
v12buf.n->n_dst = htonl(RIP_DEFAULT);
v12buf.n->n_metric = htonl(def_metric);
v12buf.n++;
}
}
(void)rn_walktree(rhead, walk_supply, 0);
ag_flush(0,0,supply_out);
/* Flush the packet buffers, provided they are not empty and
* do not contain only the password.
*/
if (v12buf.n != v12buf.base
&& (v12buf.n > v12buf.base+1
|| v12buf.base->n_family != RIP_AF_AUTH))
supply_write(&v12buf);
if (v2buf.n != v2buf.base
&& (v2buf.n > v2buf.base+1
|| v2buf.base->n_family != RIP_AF_AUTH))
supply_write(&v2buf);
/* If we sent nothing and this is an answer to a query, send
* an empty buffer.
*/
if (ws.npackets == 0
&& (ws.state & WS_ST_QUERY))
supply_write(&v12buf);
}
/* send all of the routing table or just do a flash update
*/
void
rip_bcast(int flash)
{
#ifdef _HAVE_SIN_LEN
static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}};
#else
static struct sockaddr_in dst = {AF_INET};
#endif
struct interface *ifp;
enum output_type type;
int vers;
struct timeval rtime;
need_flash = 0;
intvl_random(&rtime, MIN_WAITTIME, MAX_WAITTIME);
no_flash = rtime;
timevaladd(&no_flash, &now);
if (rip_sock < 0)
return;
trace_act("send %s and inhibit dynamic updates for %.3f sec",
flash ? "dynamic update" : "all routes",
rtime.tv_sec + ((float)rtime.tv_usec)/1000000.0);
LIST_FOREACH(ifp, &ifnet, int_list) {
/* Skip interfaces not doing RIP.
* Do try broken interfaces to see if they have healed.
*/
if (IS_RIP_OUT_OFF(ifp->int_state))
continue;
/* skip turned off interfaces */
if (!iff_up(ifp->int_if_flags))
continue;
vers = (ifp->int_state & IS_NO_RIPV1_OUT) ? RIPv2 : RIPv1;
if (ifp->int_if_flags & IFF_BROADCAST) {
/* ordinary, hardware interface */
dst.sin_addr.s_addr = ifp->int_brdaddr;
if (vers == RIPv2
&& !(ifp->int_state & IS_NO_RIP_MCAST)) {
type = OUT_MULTICAST;
} else {
type = OUT_BROADCAST;
}
} else if (ifp->int_if_flags & IFF_POINTOPOINT) {
/* point-to-point hardware interface */
dst.sin_addr.s_addr = ifp->int_dstaddr;
if (vers == RIPv2 &&
ifp->int_if_flags & IFF_MULTICAST &&
!(ifp->int_state & IS_NO_RIP_MCAST)) {
type = OUT_MULTICAST;
} else {
type = OUT_UNICAST;
}
} else if (ifp->int_state & IS_REMOTE) {
/* remote interface */
dst.sin_addr.s_addr = ifp->int_addr;
type = OUT_UNICAST;
} else {
/* ATM, HIPPI, etc. */
continue;
}
supply(&dst, ifp, type, flash, vers, 1);
}
update_seqno++; /* all routes are up to date */
}
/* Ask for routes
* Do it only once to an interface, and not even after the interface
* was broken and recovered.
*/
void
rip_query(void)
{
#ifdef _HAVE_SIN_LEN
static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}};
#else
static struct sockaddr_in dst = {AF_INET};
#endif
struct interface *ifp;
struct rip buf;
enum output_type type;
if (rip_sock < 0)
return;
memset(&buf, 0, sizeof(buf));
LIST_FOREACH(ifp, &ifnet, int_list) {
/* Skip interfaces those already queried.
* Do not ask via interfaces through which we don't
* accept input. Do not ask via interfaces that cannot
* send RIP packets.
* Do try broken interfaces to see if they have healed.
*/
if (IS_RIP_IN_OFF(ifp->int_state)
|| ifp->int_query_time != NEVER)
continue;
/* skip turned off interfaces */
if (!iff_up(ifp->int_if_flags))
continue;
buf.rip_vers = (ifp->int_state&IS_NO_RIPV1_OUT) ? RIPv2:RIPv1;
buf.rip_cmd = RIPCMD_REQUEST;
buf.rip_nets[0].n_family = RIP_AF_UNSPEC;
buf.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
/* Send a RIPv1 query only if allowed and if we will
* listen to RIPv1 routers.
*/
if ((ifp->int_state & IS_NO_RIPV1_OUT)
|| (ifp->int_state & IS_NO_RIPV1_IN)) {
buf.rip_vers = RIPv2;
} else {
buf.rip_vers = RIPv1;
}
if (ifp->int_if_flags & IFF_BROADCAST) {
/* ordinary, hardware interface */
dst.sin_addr.s_addr = ifp->int_brdaddr;
/* Broadcast RIPv1 queries and RIPv2 queries
* when the hardware cannot multicast.
*/
if (buf.rip_vers == RIPv2
&& (ifp->int_if_flags & IFF_MULTICAST)
&& !(ifp->int_state & IS_NO_RIP_MCAST)) {
type = OUT_MULTICAST;
} else {
type = OUT_BROADCAST;
}
} else if (ifp->int_if_flags & IFF_POINTOPOINT) {
/* point-to-point hardware interface */
dst.sin_addr.s_addr = ifp->int_dstaddr;
type = OUT_UNICAST;
} else if (ifp->int_state & IS_REMOTE) {
/* remote interface */
dst.sin_addr.s_addr = ifp->int_addr;
type = OUT_UNICAST;
} else {
/* ATM, HIPPI, etc. */
continue;
}
ifp->int_query_time = now.tv_sec+SUPPLY_INTERVAL;
if (output(type, &dst, ifp, &buf, sizeof(buf)) < 0)
if_sick(ifp);
}
}
Reference in New Issue View Git Blame Copy Permalink