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0145d80c3c
HardenedBSD/usr.sbin/mrouted/prune.c
Garrett Wollman b399224dfb Patches to correct endianness bugs in mtrace and a few other little 
problems.

Submitted by: bill Fenner <fenner@parc.xerox.com>
1995-07-10 16:13:05 +00:00

2336 lines
58 KiB
C
Raw Blame History

/*
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE". Use of the mrouted program represents acceptance of
* the terms and conditions listed in that file.
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*
*
* $Id: prune.c,v 1.8 1995/06/28 17:58:42 wollman Exp $
*/
#include "defs.h"
extern int cache_lifetime;
extern int max_prune_lifetime;
extern struct rtentry *routing_table;
extern int phys_vif;
/*
* dither cache lifetime to obtain a value between x and 2*x
*/
#ifdef SYSV
#define CACHE_LIFETIME(x) ((x) + (lrand48() % (x)))
#else
#define CACHE_LIFETIME(x) ((x) + (random() % (x)))
#endif
#define CHK_GS(x, y) { \
switch(x) { \
case 2: \
case 4: \
case 8: \
case 16: \
case 32: \
case 64: \
case 128: \
case 256: y = 1; \
break; \
default: y = 0; \
} \
}
struct gtable *kernel_table; /* ptr to list of kernel grp entries*/
static struct gtable *kernel_no_route; /* list of grp entries w/o routes */
struct gtable *gtp; /* pointer for kernel rt entries */
unsigned int kroutes; /* current number of cache entries */
/****************************************************************************
Functions that are local to prune.c
****************************************************************************/
static void prun_add_ttls __P((struct gtable *gt));
static int pruning_neighbor __P((vifi_t vifi, u_int32 addr));
static int can_mtrace __P((vifi_t vifi, u_int32 addr));
static struct ptable * find_prune_entry __P((u_int32 vr, struct ptable *pt));
static void send_prune __P((struct gtable *gt));
static void send_graft __P((struct gtable *gt));
static void send_graft_ack __P((u_int32 src, u_int32 dst,
u_int32 origin, u_int32 grp));
static void update_kernel __P((struct gtable *g));
static char * scaletime __P((u_long t));
/*
* Updates the ttl values for each vif.
*/
static void
prun_add_ttls(gt)
struct gtable *gt;
{
struct uvif *v;
vifi_t vifi;
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (VIFM_ISSET(vifi, gt->gt_grpmems))
gt->gt_ttls[vifi] = v->uv_threshold;
else
gt->gt_ttls[vifi] = 0;
}
}
/*
* checks for scoped multicast addresses
*/
#define GET_SCOPE(gt) { \
register int _i; \
if ((ntohl((gt)->gt_mcastgrp) & 0xff000000) == 0xef000000) \
for (_i = 0; _i < numvifs; _i++) \
if (scoped_addr(_i, (gt)->gt_mcastgrp)) \
VIFM_SET(_i, (gt)->gt_scope); \
}
int
scoped_addr(vifi, addr)
vifi_t vifi;
u_int32 addr;
{
struct vif_acl *acl;
for (acl = uvifs[vifi].uv_acl; acl; acl = acl->acl_next)
if ((addr & acl->acl_mask) == acl->acl_addr)
return 1;
return 0;
}
/*
* Determine if mcastgrp has a listener on vifi
*/
int
grplst_mem(vifi, mcastgrp)
vifi_t vifi;
u_int32 mcastgrp;
{
register struct listaddr *g;
register struct uvif *v;
v = &uvifs[vifi];
for (g = v->uv_groups; g != NULL; g = g->al_next)
if (mcastgrp == g->al_addr)
return 1;
return 0;
}
/*
* Finds the group entry with the specified source and netmask.
* If netmask is 0, it uses the route's netmask.
*
* Returns TRUE if found a match, and the global variable gtp is left
* pointing to entry before the found entry.
* Returns FALSE if no exact match found, gtp is left pointing to before
* the entry in question belongs, or is NULL if the it belongs at the
* head of the list.
*/
int
find_src_grp(src, mask, grp)
u_int32 src;
u_int32 mask;
u_int32 grp;
{
struct gtable *gt;
gtp = NULL;
gt = kernel_table;
while (gt != NULL) {
if (grp == gt->gt_mcastgrp &&
(mask ? (gt->gt_route->rt_origin == src &&
gt->gt_route->rt_originmask == mask) :
((src & gt->gt_route->rt_originmask) ==
gt->gt_route->rt_origin)))
return TRUE;
if (ntohl(grp) > ntohl(gt->gt_mcastgrp) ||
(grp == gt->gt_mcastgrp &&
(ntohl(mask) < ntohl(gt->gt_route->rt_originmask) ||
(mask == gt->gt_route->rt_originmask &&
(ntohl(src) > ntohl(gt->gt_route->rt_origin)))))) {
gtp = gt;
gt = gt->gt_gnext;
}
else break;
}
return FALSE;
}
/*
* Check if the neighbor supports pruning
*/
static int
pruning_neighbor(vifi, addr)
vifi_t vifi;
u_int32 addr;
{
struct listaddr *n = neighbor_info(vifi, addr);
int vers;
if (n == NULL)
return 0;
if (n->al_flags & NF_PRUNE)
return 1;
/*
* Versions from 3.0 to 3.4 relied on the version number to identify
* that they could handle pruning.
*/
vers = NBR_VERS(n);
return (vers >= 0x0300 && vers <= 0x0304);
}
/*
* Can the neighbor in question handle multicast traceroute?
*/
static int
can_mtrace(vifi, addr)
vifi_t vifi;
u_int32 addr;
{
struct listaddr *n = neighbor_info(vifi, addr);
int vers;
if (n == NULL)
return 0;
if (n->al_flags & NF_MTRACE)
return 1;
/*
* Versions 3.3 and 3.4 relied on the version number to identify
* that they could handle traceroute.
*/
vers = NBR_VERS(n);
return (vers >= 0x0303 && vers <= 0x0304);
}
/*
* Returns the prune entry of the router, or NULL if none exists
*/
static struct ptable *
find_prune_entry(vr, pt)
u_int32 vr;
struct ptable *pt;
{
while (pt) {
if (pt->pt_router == vr)
return pt;
pt = pt->pt_next;
}
return NULL;
}
/*
* Send a prune message to the dominant router for
* this source.
*
* Record an entry that a prune was sent for this group
*/
static void
send_prune(gt)
struct gtable *gt;
{
struct ptable *pt;
char *p;
int i;
int datalen;
u_int32 src;
u_int32 dst;
u_int32 tmp;
/* Don't process any prunes if router is not pruning */
if (pruning == 0)
return;
/* Can't process a prune if we don't have an associated route */
if (gt->gt_route == NULL)
return;
/* Don't send a prune to a non-pruning router */
if (!pruning_neighbor(gt->gt_route->rt_parent, gt->gt_route->rt_gateway))
return;
/*
* sends a prune message to the router upstream.
*/
src = uvifs[gt->gt_route->rt_parent].uv_lcl_addr;
dst = gt->gt_route->rt_gateway;
p = send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN;
datalen = 0;
/*
* determine prune lifetime
*/
gt->gt_prsent_timer = gt->gt_timer;
for (pt = gt->gt_pruntbl; pt; pt = pt->pt_next)
if (pt->pt_timer < gt->gt_prsent_timer)
gt->gt_prsent_timer = pt->pt_timer;
/*
* If we have a graft pending, cancel graft retransmission
*/
gt->gt_grftsnt = 0;
for (i = 0; i < 4; i++)
*p++ = ((char *)&(gt->gt_route->rt_origin))[i];
for (i = 0; i < 4; i++)
*p++ = ((char *)&(gt->gt_mcastgrp))[i];
tmp = htonl(gt->gt_prsent_timer);
for (i = 0; i < 4; i++)
*p++ = ((char *)&(tmp))[i];
datalen += 12;
send_igmp(src, dst, IGMP_DVMRP, DVMRP_PRUNE,
htonl(MROUTED_LEVEL), datalen);
log(LOG_DEBUG, 0, "sent prune for (%s %s)/%d on vif %d to %s",
inet_fmts(gt->gt_route->rt_origin, gt->gt_route->rt_originmask, s1),
inet_fmt(gt->gt_mcastgrp, s2),
gt->gt_prsent_timer, gt->gt_route->rt_parent,
inet_fmt(gt->gt_route->rt_gateway, s3));
}
/*
* a prune was sent upstream
* so, a graft has to be sent to annul the prune
* set up a graft timer so that if an ack is not
* heard within that time, another graft request
* is sent out.
*/
static void
send_graft(gt)
struct gtable *gt;
{
register char *p;
register int i;
int datalen;
u_int32 src;
u_int32 dst;
/* Can't send a graft without an associated route */
if (gt->gt_route == NULL)
return;
src = uvifs[gt->gt_route->rt_parent].uv_lcl_addr;
dst = gt->gt_route->rt_gateway;
p = send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN;
datalen = 0;
for (i = 0; i < 4; i++)
*p++ = ((char *)&(gt->gt_route->rt_origin))[i];
for (i = 0; i < 4; i++)
*p++ = ((char *)&(gt->gt_mcastgrp))[i];
datalen += 8;
if (datalen != 0) {
send_igmp(src, dst, IGMP_DVMRP, DVMRP_GRAFT,
htonl(MROUTED_LEVEL), datalen);
}
log(LOG_DEBUG, 0, "sent graft for (%s %s) to %s on vif %d",
inet_fmts(gt->gt_route->rt_origin, gt->gt_route->rt_originmask, s1),
inet_fmt(gt->gt_mcastgrp, s2),
inet_fmt(gt->gt_route->rt_gateway, s3), gt->gt_route->rt_parent);
}
/*
* Send an ack that a graft was received
*/
static void
send_graft_ack(src, dst, origin, grp)
u_int32 src;
u_int32 dst;
u_int32 origin;
u_int32 grp;
{
register char *p;
register int i;
int datalen;
p = send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN;
datalen = 0;
for (i = 0; i < 4; i++)
*p++ = ((char *)&(origin))[i];
for (i = 0; i < 4; i++)
*p++ = ((char *)&(grp))[i];
datalen += 8;
send_igmp(src, dst, IGMP_DVMRP, DVMRP_GRAFT_ACK,
htonl(MROUTED_LEVEL), datalen);
log(LOG_DEBUG, 0, "sent graft ack for (%s, %s) to %s",
inet_fmt(origin, s1), inet_fmt(grp, s2), inet_fmt(dst, s3));
}
/*
* Update the kernel cache with all the routes hanging off the group entry
*/
static void
update_kernel(g)
struct gtable *g;
{
struct stable *st;
for (st = g->gt_srctbl; st; st = st->st_next)
k_add_rg(st->st_origin, g);
}
/****************************************************************************
Functions that are used externally
****************************************************************************/
#ifdef SNMP
#include <sys/types.h>
#include "snmp.h"
/*
* Find a specific group entry in the group table
*/
struct gtable *
find_grp(grp)
u_long grp;
{
struct gtable *gt;
for (gt = kernel_table; gt; gt = gt->gt_gnext) {
if (ntohl(grp) < ntohl(gt->gt_mcastgrp))
break;
if (gt->gt_mcastgrp == grp)
return gt;
}
return NULL;
}
/*
* Given a group entry and source, find the corresponding source table
* entry
*/
struct stable *
find_grp_src(gt, src)
struct gtable *gt;
u_long src;
{
struct stable *st;
u_long grp = gt->gt_mcastgrp;
struct gtable *gtcurr;
for (gtcurr = gt; gtcurr->gt_mcastgrp == grp; gtcurr = gtcurr->gt_gnext) {
for (st = gtcurr->gt_srctbl; st; st = st->st_next)
if (st->st_origin == src)
return st;
}
return NULL;
}
/*
* Find next entry > specification
*/
int
next_grp_src_mask(gtpp, stpp, grp, src, mask)
struct gtable **gtpp; /* ordered by group */
struct stable **stpp; /* ordered by source */
u_long grp;
u_long src;
u_long mask;
{
struct gtable *gt, *gbest = NULL;
struct stable *st, *sbest = NULL;
/* Find first group entry >= grp spec */
(*gtpp) = kernel_table;
while ((*gtpp) && ntohl((*gtpp)->gt_mcastgrp) < ntohl(grp))
(*gtpp)=(*gtpp)->gt_gnext;
if (!(*gtpp))
return 0; /* no more groups */
for (gt = kernel_table; gt; gt=gt->gt_gnext) {
/* Since grps are ordered, we can stop when group changes from gbest */
if (gbest && gbest->gt_mcastgrp != gt->gt_mcastgrp)
break;
for (st = gt->gt_srctbl; st; st=st->st_next) {
/* Among those entries > spec, find "lowest" one */
if (((ntohl(gt->gt_mcastgrp)> ntohl(grp))
|| (ntohl(gt->gt_mcastgrp)==ntohl(grp)
&& ntohl(st->st_origin)> ntohl(src))
|| (ntohl(gt->gt_mcastgrp)==ntohl(grp)
&& ntohl(st->st_origin)==src && 0xFFFFFFFF>ntohl(mask)))
&& (!gbest
|| (ntohl(gt->gt_mcastgrp)< ntohl(gbest->gt_mcastgrp))
|| (ntohl(gt->gt_mcastgrp)==ntohl(gbest->gt_mcastgrp)
&& ntohl(st->st_origin)< ntohl(sbest->st_origin)))) {
gbest = gt;
sbest = st;
}
}
}
(*gtpp) = gbest;
(*stpp) = sbest;
return (*gtpp)!=0;
}
/*
* Ensure that sg contains current information for the given group,source.
* This is fetched from the kernel as a unit so that counts for the entry
* are consistent, i.e. packet and byte counts for the same entry are
* read at the same time.
*/
void
refresh_sg(sg, gt, st)
struct sioc_sg_req *sg;
struct gtable *gt;
struct stable *st;
{
static int lastq = -1;
if (quantum != lastq || sg->src.s_addr!=st->st_origin
|| sg->grp.s_addr!=gt->gt_mcastgrp) {
lastq = quantum;
sg->src.s_addr = st->st_origin;
sg->grp.s_addr = gt->gt_mcastgrp;
ioctl(udp_socket, SIOCGETSGCNT, (char *)sg);
}
}
/*
* Return pointer to a specific route entry. This must be a separate
* function from find_route() which modifies rtp.
*/
struct rtentry *
snmp_find_route(src, mask)
register u_long src, mask;
{
register struct rtentry *rt;
for (rt = routing_table; rt; rt = rt->rt_next) {
if (src == rt->rt_origin && mask == rt->rt_originmask)
return rt;
}
return NULL;
}
/*
* Find next route entry > specification
*/
int
next_route(rtpp, src, mask)
struct rtentry **rtpp;
u_long src;
u_long mask;
{
struct rtentry *rt, *rbest = NULL;
/* Among all entries > spec, find "lowest" one in order */
for (rt = routing_table; rt; rt=rt->rt_next) {
if ((ntohl(rt->rt_origin) > ntohl(src)
|| (ntohl(rt->rt_origin) == ntohl(src)
&& ntohl(rt->rt_originmask) > ntohl(mask)))
&& (!rbest || (ntohl(rt->rt_origin) < ntohl(rbest->rt_origin))
|| (ntohl(rt->rt_origin) == ntohl(rbest->rt_origin)
&& ntohl(rt->rt_originmask) < ntohl(rbest->rt_originmask))))
rbest = rt;
}
(*rtpp) = rbest;
return (*rtpp)!=0;
}
/*
* Given a routing table entry, and a vifi, find the next vifi/entry
*/
int
next_route_child(rtpp, src, mask, vifi)
struct rtentry **rtpp;
u_long src;
u_long mask;
vifi_t *vifi; /* vif at which to start looking */
{
struct rtentry *rt;
/* Get (S,M) entry */
if (!((*rtpp) = snmp_find_route(src,mask)))
if (!next_route(rtpp, src, mask))
return 0;
/* Continue until we get one with a valid next vif */
do {
for (; (*rtpp)->rt_children && *vifi<numvifs; (*vifi)++)
if (VIFM_ISSET(*vifi, (*rtpp)->rt_children))
return 1;
*vifi = 0;
} while( next_route(rtpp, (*rtpp)->rt_origin, (*rtpp)->rt_originmask) );
return 0;
}
/*
* Given a routing table entry, and a vifi, find the next entry
* equal to or greater than those
*/
int
next_child(gtpp, stpp, grp, src, mask, vifi)
struct gtable **gtpp;
struct stable **stpp;
u_long grp;
u_long src;
u_long mask;
vifi_t *vifi; /* vif at which to start looking */
{
struct stable *st;
/* Get (G,S,M) entry */
if (mask!=0xFFFFFFFF
|| !((*gtpp) = find_grp(grp))
|| !((*stpp) = find_grp_src((*gtpp),src)))
if (!next_grp_src_mask(gtpp, stpp, grp, src, mask))
return 0;
/* Continue until we get one with a valid next vif */
do {
for (; (*gtpp)->gt_route->rt_children && *vifi<numvifs; (*vifi)++)
if (VIFM_ISSET(*vifi, (*gtpp)->gt_route->rt_children))
return 1;
*vifi = 0;
} while (next_grp_src_mask(gtpp, stpp, (*gtpp)->gt_mcastgrp,
(*stpp)->st_origin, 0xFFFFFFFF) );
return 0;
}
#endif /* SNMP */
/*
* Initialize the kernel table structure
*/
void
init_ktable()
{
kernel_table = NULL;
kernel_no_route = NULL;
kroutes = 0;
}
/*
* Add a new table entry for (origin, mcastgrp)
*/
void
add_table_entry(origin, mcastgrp)
u_int32 origin;
u_int32 mcastgrp;
{
struct rtentry *r;
struct gtable *gt,**gtnp,*prev_gt;
struct stable *st,**stnp;
int i;
r = determine_route(origin);
prev_gt = NULL;
if (r == NULL) {
/*
* Look for it on the no_route table; if it is found then
* it will be detected as a duplicate below.
*/
for (gt = kernel_no_route; gt; gt = gt->gt_next)
if (mcastgrp == gt->gt_mcastgrp &&
gt->gt_srctbl && gt->gt_srctbl->st_origin == origin)
break;
gtnp = &kernel_no_route;
} else {
gtnp = &r->rt_groups;
while ((gt = *gtnp) != NULL) {
if (gt->gt_mcastgrp >= mcastgrp)
break;
gtnp = &gt->gt_next;
prev_gt = gt;
}
}
if (gt == NULL || gt->gt_mcastgrp != mcastgrp) {
gt = (struct gtable *)malloc(sizeof(struct gtable));
if (gt == NULL)
log(LOG_ERR, 0, "ran out of memory");
gt->gt_mcastgrp = mcastgrp;
gt->gt_timer = CACHE_LIFETIME(cache_lifetime);
time(&gt->gt_ctime);
gt->gt_grpmems = 0;
gt->gt_scope = 0;
gt->gt_prsent_timer = 0;
gt->gt_grftsnt = 0;
gt->gt_srctbl = NULL;
gt->gt_pruntbl = NULL;
gt->gt_route = r;
#ifdef RSRR
gt->gt_rsrr_cache = NULL;
#endif
if (r != NULL) {
/* obtain the multicast group membership list */
for (i = 0; i < numvifs; i++) {
if (VIFM_ISSET(i, r->rt_children) &&
!(VIFM_ISSET(i, r->rt_leaves)))
VIFM_SET(i, gt->gt_grpmems);
if (VIFM_ISSET(i, r->rt_leaves) && grplst_mem(i, mcastgrp))
VIFM_SET(i, gt->gt_grpmems);
}
GET_SCOPE(gt);
if (VIFM_ISSET(r->rt_parent, gt->gt_scope))
gt->gt_scope = -1;
gt->gt_grpmems &= ~gt->gt_scope;
} else {
gt->gt_scope = -1;
gt->gt_grpmems = 0;
}
/* update ttls */
prun_add_ttls(gt);
gt->gt_next = *gtnp;
*gtnp = gt;
if (gt->gt_next)
gt->gt_next->gt_prev = gt;
gt->gt_prev = prev_gt;
if (r) {
if (find_src_grp(r->rt_origin, r->rt_originmask, gt->gt_mcastgrp)) {
struct gtable *g;
g = gtp ? gtp->gt_gnext : kernel_table;
log(LOG_WARNING, 0, "Entry for (%s %s) (rt:%x) exists (rt:%x)",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2),
r, g->gt_route);
} else {
if (gtp) {
gt->gt_gnext = gtp->gt_gnext;
gt->gt_gprev = gtp;
gtp->gt_gnext = gt;
} else {
gt->gt_gnext = kernel_table;
gt->gt_gprev = NULL;
kernel_table = gt;
}
if (gt->gt_gnext)
gt->gt_gnext->gt_gprev = gt;
}
} else {
gt->gt_gnext = gt->gt_prev = NULL;
}
}
stnp = &gt->gt_srctbl;
while ((st = *stnp) != NULL) {
if (ntohl(st->st_origin) >= ntohl(origin))
break;
stnp = &st->st_next;
}
if (st == NULL || st->st_origin != origin) {
st = (struct stable *)malloc(sizeof(struct stable));
if (st == NULL)
log(LOG_ERR, 0, "ran out of memory");
st->st_origin = origin;
st->st_pktcnt = 0;
st->st_next = *stnp;
*stnp = st;
} else {
log(LOG_WARNING, 0, "kernel entry already exists for (%s %s)",
inet_fmt(origin, s1), inet_fmt(mcastgrp, s2));
return;
}
kroutes++;
k_add_rg(origin, gt);
log(LOG_DEBUG, 0, "add cache entry (%s %s) gm:%x, parent-vif:%d",
inet_fmt(origin, s1),
inet_fmt(mcastgrp, s2),
gt->gt_grpmems, r ? r->rt_parent : -1);
/* If there are no leaf vifs
* which have this group, then
* mark this src-grp as a prune candidate.
*/
if (!gt->gt_prsent_timer && !gt->gt_grpmems && r && r->rt_gateway)
send_prune(gt);
}
/*
* An mrouter has gone down and come up on an interface
* Forward on that interface immediately
*/
void
reset_neighbor_state(vifi, addr)
vifi_t vifi;
u_int32 addr;
{
struct rtentry *r;
struct gtable *g;
struct ptable *pt, *prev_pt;
struct stable *st, *prev_st;
for (g = kernel_table; g; g = g->gt_gnext) {
r = g->gt_route;
/*
* If neighbor was the parent, remove the prune sent state
* Don't send any grafts upstream.
*/
if (vifi == r->rt_parent) {
if (addr == r->rt_gateway) {
log(LOG_DEBUG, 0, "reset_neighbor_state del prunes (%s %s)",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2));
pt = g->gt_pruntbl;
while (pt) {
/*
* Expire prune, send again on this vif.
*/
VIFM_SET(pt->pt_vifi, g->gt_grpmems);
prev_pt = pt;
pt = prev_pt->pt_next;
free(prev_pt);
}
g->gt_pruntbl = NULL;
st = g->gt_srctbl;
while (st) {
log(LOG_DEBUG, 0, "reset_neighbor_state del sg (%s %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(g->gt_mcastgrp, s2));
if (k_del_rg(st->st_origin, g) < 0) {
log(LOG_WARNING, errno,
"reset_neighbor_state trying to delete (%s %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(g->gt_mcastgrp, s2));
}
kroutes--;
prev_st = st;
st = prev_st->st_next;
free(prev_st);
}
g->gt_srctbl = NULL;
/*
* Keep the group entries themselves around since the
* state will likely just come right back, and if not,
* the group entries will time out with no kernel entries
* and no prune state.
*/
g->gt_prsent_timer = 0;
g->gt_grftsnt = 0;
}
} else {
/*
* Neighbor was not the parent, send grafts to join the groups
*/
if (g->gt_prsent_timer) {
g->gt_grftsnt = 1;
send_graft(g);
g->gt_prsent_timer = 0;
}
/*
* Remove any prunes that this router has sent us.
*/
prev_pt = (struct ptable *)&g->gt_pruntbl;
for (pt = g->gt_pruntbl; pt; pt = pt->pt_next) {
if (pt->pt_vifi == vifi && pt->pt_router == addr) {
prev_pt->pt_next = pt->pt_next;
free(pt);
} else
prev_pt = pt;
}
/*
* And see if we want to forward again.
*/
if (!VIFM_ISSET(vifi, g->gt_grpmems)) {
if (VIFM_ISSET(vifi, r->rt_children) &&
!(VIFM_ISSET(vifi, r->rt_leaves)))
VIFM_SET(vifi, g->gt_grpmems);
if (VIFM_ISSET(vifi, r->rt_leaves) &&
grplst_mem(vifi, g->gt_mcastgrp))
VIFM_SET(vifi, g->gt_grpmems);
g->gt_grpmems &= ~g->gt_scope;
prun_add_ttls(g);
/* Update kernel state */
update_kernel(g);
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,1);
#endif /* RSRR */
log(LOG_DEBUG, 0, "reset member state (%s %s) gm:%x",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2), g->gt_grpmems);
}
}
}
}
/*
* Delete table entry from the kernel
* del_flag determines how many entries to delete
*/
void
del_table_entry(r, mcastgrp, del_flag)
struct rtentry *r;
u_int32 mcastgrp;
u_int del_flag;
{
struct gtable *g, *prev_g;
struct stable *st, *prev_st;
struct ptable *pt, *prev_pt;
if (del_flag == DEL_ALL_ROUTES) {
g = r->rt_groups;
while (g) {
log(LOG_DEBUG, 0, "del_table_entry deleting (%s %s)",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2));
st = g->gt_srctbl;
while (st) {
if (k_del_rg(st->st_origin, g) < 0) {
log(LOG_WARNING, errno,
"del_table_entry trying to delete (%s, %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(g->gt_mcastgrp, s2));
}
kroutes--;
prev_st = st;
st = st->st_next;
free(prev_st);
}
g->gt_srctbl = NULL;
pt = g->gt_pruntbl;
while (pt) {
prev_pt = pt->pt_next;
free(pt);
pt = prev_pt;
}
g->gt_pruntbl = NULL;
if (g->gt_gnext)
g->gt_gnext->gt_gprev = g->gt_gprev;
if (g->gt_gprev)
g->gt_gprev->gt_gnext = g->gt_gnext;
else
kernel_table = g->gt_gnext;
prev_g = g->gt_next;
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,0);
rsrr_cache_clean(g);
#endif /* RSRR */
free(g);
g = prev_g;
}
r->rt_groups = NULL;
}
/*
* Dummy routine - someday this may be needed, so it is just there
*/
if (del_flag == DEL_RTE_GROUP) {
prev_g = (struct gtable *)&r->rt_groups;
for (g = r->rt_groups; g; g = g->gt_next) {
if (g->gt_mcastgrp == mcastgrp) {
log(LOG_DEBUG, 0, "del_table_entry deleting (%s %s)",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2));
st = g->gt_srctbl;
while (st) {
if (k_del_rg(st->st_origin, g) < 0) {
log(LOG_WARNING, errno,
"del_table_entry trying to delete (%s, %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(g->gt_mcastgrp, s2));
}
kroutes--;
prev_st = st->st_next;
free(st);
st = prev_st;
}
g->gt_srctbl = NULL;
pt = g->gt_pruntbl;
while (pt) {
prev_pt = pt->pt_next;
free(pt);
pt = prev_pt;
}
g->gt_pruntbl = NULL;
if (g->gt_gnext)
g->gt_gnext->gt_gprev = g->gt_gprev;
if (g->gt_gprev)
g->gt_gprev->gt_gnext = g->gt_gnext;
else
kernel_table = g->gt_gnext;
if (prev_g != (struct gtable *)&r->rt_groups)
g->gt_next->gt_prev = prev_g;
else
g->gt_next->gt_prev = NULL;
prev_g->gt_next = g->gt_next;
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,0);
rsrr_cache_clean(g);
#endif /* RSRR */
free(g);
g = prev_g;
} else {
prev_g = g;
}
}
}
}
/*
* update kernel table entry when a route entry changes
*/
void
update_table_entry(r)
struct rtentry *r;
{
struct gtable *g;
struct ptable *pt, *prev_pt;
int i;
for (g = r->rt_groups; g; g = g->gt_next) {
pt = g->gt_pruntbl;
while (pt) {
prev_pt = pt->pt_next;
free(pt);
pt = prev_pt;
}
g->gt_pruntbl = NULL;
g->gt_grpmems = 0;
/* obtain the multicast group membership list */
for (i = 0; i < numvifs; i++) {
if (VIFM_ISSET(i, r->rt_children) &&
!(VIFM_ISSET(i, r->rt_leaves)))
VIFM_SET(i, g->gt_grpmems);
if (VIFM_ISSET(i, r->rt_leaves) && grplst_mem(i, g->gt_mcastgrp))
VIFM_SET(i, g->gt_grpmems);
}
if (VIFM_ISSET(r->rt_parent, g->gt_scope))
g->gt_scope = -1;
g->gt_grpmems &= ~g->gt_scope;
log(LOG_DEBUG, 0, "updating cache entries (%s %s) gm:%x",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2),
g->gt_grpmems);
if (g->gt_grpmems && g->gt_prsent_timer) {
g->gt_grftsnt = 1;
send_graft(g);
g->gt_prsent_timer = 0;
}
/* update ttls and add entry into kernel */
prun_add_ttls(g);
update_kernel(g);
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,1);
#endif /* RSRR */
/* Check if we want to prune this group */
if (!g->gt_prsent_timer && g->gt_grpmems == 0 && r->rt_gateway) {
g->gt_timer = CACHE_LIFETIME(cache_lifetime);
send_prune(g);
}
}
}
/*
* set the forwarding flag for all mcastgrps on this vifi
*/
void
update_lclgrp(vifi, mcastgrp)
vifi_t vifi;
u_int32 mcastgrp;
{
struct rtentry *r;
struct gtable *g;
log(LOG_DEBUG, 0, "group %s joined on vif %d",
inet_fmt(mcastgrp, s1), vifi);
for (g = kernel_table; g; g = g->gt_gnext) {
if (ntohl(mcastgrp) < ntohl(g->gt_mcastgrp))
break;
r = g->gt_route;
if (g->gt_mcastgrp == mcastgrp &&
VIFM_ISSET(vifi, r->rt_children)) {
VIFM_SET(vifi, g->gt_grpmems);
g->gt_grpmems &= ~g->gt_scope;
if (g->gt_grpmems == 0)
continue;
prun_add_ttls(g);
log(LOG_DEBUG, 0, "update lclgrp (%s %s) gm:%x",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2), g->gt_grpmems);
update_kernel(g);
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,1);
#endif /* RSRR */
}
}
}
/*
* reset forwarding flag for all mcastgrps on this vifi
*/
void
delete_lclgrp(vifi, mcastgrp)
vifi_t vifi;
u_int32 mcastgrp;
{
struct rtentry *r;
struct gtable *g;
log(LOG_DEBUG, 0, "group %s left on vif %d",
inet_fmt(mcastgrp, s1), vifi);
for (g = kernel_table; g; g = g->gt_gnext) {
if (ntohl(mcastgrp) < ntohl(g->gt_mcastgrp))
break;
if (g->gt_mcastgrp == mcastgrp) {
int stop_sending = 1;
r = g->gt_route;
/*
* If this is not a leaf, then we have router neighbors on this
* vif. Only turn off forwarding if they have all pruned.
*/
if (!VIFM_ISSET(vifi, r->rt_leaves)) {
struct listaddr *vr;
for (vr = uvifs[vifi].uv_neighbors; vr; vr = vr->al_next)
if (find_prune_entry(vr->al_addr, g->gt_pruntbl) == NULL) {
stop_sending = 0;
break;
}
}
if (stop_sending) {
VIFM_CLR(vifi, g->gt_grpmems);
log(LOG_DEBUG, 0, "delete lclgrp (%s %s) gm:%x",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2), g->gt_grpmems);
prun_add_ttls(g);
update_kernel(g);
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,1);
#endif /* RSRR */
/*
* If there are no more members of this particular group,
* send prune upstream
*/
if (!g->gt_prsent_timer && g->gt_grpmems == 0 && r->rt_gateway)
send_prune(g);
}
}
}
}
/*
* Takes the prune message received and then strips it to
* determine the (src, grp) pair to be pruned.
*
* Adds the router to the (src, grp) entry then.
*
* Determines if further packets have to be sent down that vif
*
* Determines if a corresponding prune message has to be generated
*/
void
accept_prune(src, dst, p, datalen)
u_int32 src;
u_int32 dst;
char *p;
int datalen;
{
u_int32 prun_src;
u_int32 prun_grp;
u_int32 prun_tmr;
vifi_t vifi;
int i;
int stop_sending;
struct rtentry *r;
struct gtable *g;
struct ptable *pt;
struct listaddr *vr;
/* Don't process any prunes if router is not pruning */
if (pruning == 0)
return;
if ((vifi = find_vif(src, dst)) == NO_VIF) {
log(LOG_INFO, 0,
"ignoring prune report from non-neighbor %s",
inet_fmt(src, s1));
return;
}
/* Check if enough data is present */
if (datalen < 12)
{
log(LOG_WARNING, 0,
"non-decipherable prune from %s",
inet_fmt(src, s1));
return;
}
for (i = 0; i< 4; i++)
((char *)&prun_src)[i] = *p++;
for (i = 0; i< 4; i++)
((char *)&prun_grp)[i] = *p++;
for (i = 0; i< 4; i++)
((char *)&prun_tmr)[i] = *p++;
prun_tmr = ntohl(prun_tmr);
log(LOG_DEBUG, 0, "%s on vif %d prunes (%s %s)/%d",
inet_fmt(src, s1), vifi,
inet_fmt(prun_src, s2), inet_fmt(prun_grp, s3), prun_tmr);
/*
* Find the subnet for the prune
*/
if (find_src_grp(prun_src, 0, prun_grp)) {
g = gtp ? gtp->gt_gnext : kernel_table;
r = g->gt_route;
if (!VIFM_ISSET(vifi, r->rt_children)) {
log(LOG_WARNING, 0, "prune received from non-child %s for (%s %s)",
inet_fmt(src, s1), inet_fmt(prun_src, s2),
inet_fmt(prun_grp, s3));
return;
}
if (VIFM_ISSET(vifi, g->gt_scope)) {
log(LOG_WARNING, 0, "prune received from %s on scoped grp (%s %s)",
inet_fmt(src, s1), inet_fmt(prun_src, s2),
inet_fmt(prun_grp, s3));
return;
}
if ((pt = find_prune_entry(src, g->gt_pruntbl)) != NULL) {
/*
* If it's about to expire, then it's only still around because
* of timer granularity, so don't warn about it.
*/
if (pt->pt_timer > 10) {
log(LOG_WARNING, 0, "%s %d from %s for (%s %s)/%d %s %d %s %x",
"duplicate prune received on vif",
vifi, inet_fmt(src, s1), inet_fmt(prun_src, s2),
inet_fmt(prun_grp, s3), prun_tmr,
"old timer:", pt->pt_timer, "cur gm:", g->gt_grpmems);
}
pt->pt_timer = prun_tmr;
} else {
/* allocate space for the prune structure */
pt = (struct ptable *)(malloc(sizeof(struct ptable)));
if (pt == NULL)
log(LOG_ERR, 0, "pt: ran out of memory");
pt->pt_vifi = vifi;
pt->pt_router = src;
pt->pt_timer = prun_tmr;
pt->pt_next = g->gt_pruntbl;
g->gt_pruntbl = pt;
}
/* Refresh the group's lifetime */
g->gt_timer = CACHE_LIFETIME(cache_lifetime);
if (g->gt_timer < prun_tmr)
g->gt_timer = prun_tmr;
/*
* check if any more packets need to be sent on the
* vif which sent this message
*/
stop_sending = 1;
for (vr = uvifs[vifi].uv_neighbors; vr; vr = vr->al_next)
if (find_prune_entry(vr->al_addr, g->gt_pruntbl) == NULL) {
stop_sending = 0;
break;
}
if (stop_sending && !grplst_mem(vifi, prun_grp)) {
VIFM_CLR(vifi, g->gt_grpmems);
log(LOG_DEBUG, 0, "prune (%s %s), stop sending on vif %d, gm:%x",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2), vifi, g->gt_grpmems);
prun_add_ttls(g);
update_kernel(g);
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,1);
#endif /* RSRR */
}
/*
* check if all the child routers have expressed no interest
* in this group and if this group does not exist in the
* interface
* Send a prune message then upstream
*/
if (!g->gt_prsent_timer && g->gt_grpmems == 0 && r->rt_gateway) {
send_prune(g);
}
} else {
/*
* There is no kernel entry for this group. Therefore, we can
* simply ignore the prune, as we are not forwarding this traffic
* downstream.
*/
log(LOG_DEBUG, 0, "%s (%s %s)/%d from %s",
"prune message received with no kernel entry for",
inet_fmt(prun_src, s1), inet_fmt(prun_grp, s2),
prun_tmr, inet_fmt(src, s3));
return;
}
}
/*
* Checks if this mcastgrp is present in the kernel table
* If so and if a prune was sent, it sends a graft upwards
*/
void
chkgrp_graft(vifi, mcastgrp)
vifi_t vifi;
u_int32 mcastgrp;
{
struct rtentry *r;
struct gtable *g;
for (g = kernel_table; g; g = g->gt_gnext) {
if (ntohl(mcastgrp) < ntohl(g->gt_mcastgrp))
break;
r = g->gt_route;
if (g->gt_mcastgrp == mcastgrp && VIFM_ISSET(vifi, r->rt_children))
if (g->gt_prsent_timer) {
VIFM_SET(vifi, g->gt_grpmems);
/*
* If the vif that was joined was a scoped vif,
* ignore it ; don't graft back
*/
g->gt_grpmems &= ~g->gt_scope;
if (g->gt_grpmems == 0)
continue;
/* set the flag for graft retransmission */
g->gt_grftsnt = 1;
/* send graft upwards */
send_graft(g);
/* reset the prune timer and update cache timer*/
g->gt_prsent_timer = 0;
g->gt_timer = max_prune_lifetime;
log(LOG_DEBUG, 0, "chkgrp graft (%s %s) gm:%x",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2), g->gt_grpmems);
prun_add_ttls(g);
update_kernel(g);
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,1);
#endif /* RSRR */
}
}
}
/* determine the multicast group and src
*
* if it does, then determine if a prune was sent
* upstream.
* if prune sent upstream, send graft upstream and send
* ack downstream.
*
* if no prune sent upstream, change the forwarding bit
* for this interface and send ack downstream.
*
* if no entry exists for this group send ack downstream.
*/
void
accept_graft(src, dst, p, datalen)
u_int32 src;
u_int32 dst;
char *p;
int datalen;
{
vifi_t vifi;
u_int32 graft_src;
u_int32 graft_grp;
int i;
struct rtentry *r;
struct gtable *g;
struct ptable *pt, **ptnp;
if ((vifi = find_vif(src, dst)) == NO_VIF) {
log(LOG_INFO, 0,
"ignoring graft from non-neighbor %s",
inet_fmt(src, s1));
return;
}
if (datalen < 8) {
log(LOG_WARNING, 0,
"received non-decipherable graft from %s",
inet_fmt(src, s1));
return;
}
for (i = 0; i< 4; i++)
((char *)&graft_src)[i] = *p++;
for (i = 0; i< 4; i++)
((char *)&graft_grp)[i] = *p++;
log(LOG_DEBUG, 0, "%s on vif %d grafts (%s %s)",
inet_fmt(src, s1), vifi,
inet_fmt(graft_src, s2), inet_fmt(graft_grp, s3));
/*
* Find the subnet for the graft
*/
if (find_src_grp(graft_src, 0, graft_grp)) {
g = gtp ? gtp->gt_gnext : kernel_table;
r = g->gt_route;
if (VIFM_ISSET(vifi, g->gt_scope)) {
log(LOG_WARNING, 0, "graft received from %s on scoped grp (%s %s)",
inet_fmt(src, s1), inet_fmt(graft_src, s2),
inet_fmt(graft_grp, s3));
return;
}
ptnp = &g->gt_pruntbl;
while ((pt = *ptnp) != NULL) {
if ((pt->pt_vifi == vifi) && (pt->pt_router == src)) {
*ptnp = pt->pt_next;
free(pt);
VIFM_SET(vifi, g->gt_grpmems);
log(LOG_DEBUG, 0, "accept graft (%s %s) gm:%x",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(g->gt_mcastgrp, s2), g->gt_grpmems);
prun_add_ttls(g);
update_kernel(g);
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(g,1);
#endif /* RSRR */
break;
} else {
ptnp = &pt->pt_next;
}
}
/* send ack downstream */
send_graft_ack(dst, src, graft_src, graft_grp);
g->gt_timer = max_prune_lifetime;
if (g->gt_prsent_timer) {
/* set the flag for graft retransmission */
g->gt_grftsnt = 1;
/* send graft upwards */
send_graft(g);
/* reset the prune sent timer */
g->gt_prsent_timer = 0;
}
} else {
/*
* We have no state for the source and group in question.
* We can simply acknowledge the graft, since we know
* that we have no prune state, and grafts are requests
* to remove prune state.
*/
send_graft_ack(dst, src, graft_src, graft_grp);
log(LOG_DEBUG, 0, "%s (%s %s) from %s",
"graft received with no kernel entry for",
inet_fmt(graft_src, s1), inet_fmt(graft_grp, s2),
inet_fmt(src, s3));
return;
}
}
/*
* find out which group is involved first of all
* then determine if a graft was sent.
* if no graft sent, ignore the message
* if graft was sent and the ack is from the right
* source, remove the graft timer so that we don't
* have send a graft again
*/
void
accept_g_ack(src, dst, p, datalen)
u_int32 src;
u_int32 dst;
char *p;
int datalen;
{
struct gtable *g;
vifi_t vifi;
u_int32 grft_src;
u_int32 grft_grp;
int i;
if ((vifi = find_vif(src, dst)) == NO_VIF) {
log(LOG_INFO, 0,
"ignoring graft ack from non-neighbor %s",
inet_fmt(src, s1));
return;
}
if (datalen < 0 || datalen > 8) {
log(LOG_WARNING, 0,
"received non-decipherable graft ack from %s",
inet_fmt(src, s1));
return;
}
for (i = 0; i< 4; i++)
((char *)&grft_src)[i] = *p++;
for (i = 0; i< 4; i++)
((char *)&grft_grp)[i] = *p++;
log(LOG_DEBUG, 0, "%s on vif %d acks graft (%s, %s)",
inet_fmt(src, s1), vifi,
inet_fmt(grft_src, s2), inet_fmt(grft_grp, s3));
/*
* Find the subnet for the graft ack
*/
if (find_src_grp(grft_src, 0, grft_grp)) {
g = gtp ? gtp->gt_gnext : kernel_table;
g->gt_grftsnt = 0;
} else {
log(LOG_WARNING, 0, "%s (%s, %s) from %s",
"rcvd graft ack with no kernel entry for",
inet_fmt(grft_src, s1), inet_fmt(grft_grp, s2),
inet_fmt(src, s3));
return;
}
}
/*
* free all prune entries and kernel routes
* normally, this should inform the kernel that all of its routes
* are going away, but this is only called by restart(), which is
* about to call MRT_DONE which does that anyway.
*/
void
free_all_prunes()
{
register struct rtentry *r;
register struct gtable *g, *prev_g;
register struct stable *s, *prev_s;
register struct ptable *p, *prev_p;
for (r = routing_table; r; r = r->rt_next) {
g = r->rt_groups;
while (g) {
s = g->gt_srctbl;
while (s) {
prev_s = s->st_next;
free(s);
s = prev_s;
}
p = g->gt_pruntbl;
while (p) {
prev_p = p->pt_next;
free(p);
p = prev_p;
}
prev_g = g->gt_next;
free(g);
g = prev_g;
}
r->rt_groups = NULL;
}
kernel_table = NULL;
g = kernel_no_route;
while (g) {
if (g->gt_srctbl)
free(g->gt_srctbl);
prev_g = g->gt_next;
free(g);
g = prev_g;
}
kernel_no_route = NULL;
}
/*
* When a new route is created, search
* a) The less-specific part of the routing table
* b) The route-less kernel table
* for sources that the new route might want to handle.
*
* "Inheriting" these sources might be cleanest, but simply deleting
* them is easier, and letting the kernel re-request them.
*/
void
steal_sources(rt)
struct rtentry *rt;
{
register struct rtentry *rp;
register struct gtable *gt, **gtnp;
register struct stable *st, **stnp;
for (rp = rt->rt_next; rp; rp = rp->rt_next) {
if ((rt->rt_origin & rp->rt_originmask) == rp->rt_origin) {
log(LOG_DEBUG, 0, "Route for %s stealing sources from %s",
inet_fmts(rt->rt_origin, rt->rt_originmask, s1),
inet_fmts(rp->rt_origin, rp->rt_originmask, s2));
for (gt = rp->rt_groups; gt; gt = gt->gt_next) {
stnp = &gt->gt_srctbl;
while ((st = *stnp) != NULL) {
if ((st->st_origin & rt->rt_originmask) == rt->rt_origin) {
log(LOG_DEBUG, 0, "%s stealing (%s %s) from %s",
inet_fmts(rt->rt_origin, rt->rt_originmask, s1),
inet_fmt(st->st_origin, s3),
inet_fmt(gt->gt_mcastgrp, s4),
inet_fmts(rp->rt_origin, rp->rt_originmask, s2));
if (k_del_rg(st->st_origin, gt) < 0) {
log(LOG_WARNING, errno, "%s (%s, %s)",
"steal_sources trying to delete",
inet_fmt(st->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
}
*stnp = st->st_next;
kroutes--;
free(st);
} else {
stnp = &st->st_next;
}
}
}
}
}
gtnp = &kernel_no_route;
while ((gt = *gtnp) != NULL) {
if (gt->gt_srctbl && ((gt->gt_srctbl->st_origin & rt->rt_originmask)
== rt->rt_origin)) {
log(LOG_DEBUG, 0, "%s stealing (%s %s) from %s",
inet_fmts(rt->rt_origin, rt->rt_originmask, s1),
inet_fmt(gt->gt_srctbl->st_origin, s3),
inet_fmt(gt->gt_mcastgrp, s4),
"no_route table");
if (k_del_rg(gt->gt_srctbl->st_origin, gt) < 0) {
log(LOG_WARNING, errno, "%s (%s %s)",
"steal_sources trying to delete",
inet_fmt(gt->gt_srctbl->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
}
kroutes--;
free(gt->gt_srctbl);
*gtnp = gt->gt_next;
if (gt->gt_next)
gt->gt_next->gt_prev = gt->gt_prev;
free(gt);
} else {
gtnp = &gt->gt_next;
}
}
}
/*
* Advance the timers on all the cache entries.
* If there are any entries whose timers have expired,
* remove these entries from the kernel cache.
*/
void
age_table_entry()
{
struct rtentry *r;
struct gtable *gt, **gtnptr;
struct stable *st, **stnp;
struct ptable *pt, **ptnp;
struct sioc_sg_req sg_req;
log(LOG_DEBUG, 0, "ageing entries");
gtnptr = &kernel_table;
while ((gt = *gtnptr) != NULL) {
r = gt->gt_route;
/* advance the timer for the kernel entry */
gt->gt_timer -= ROUTE_MAX_REPORT_DELAY;
/* decrement prune timer if need be */
if (gt->gt_prsent_timer > 0) {
gt->gt_prsent_timer -= ROUTE_MAX_REPORT_DELAY;
if (gt->gt_prsent_timer <= 0) {
log(LOG_DEBUG, 0, "upstream prune tmo (%s %s)",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(gt->gt_mcastgrp, s2));
gt->gt_prsent_timer = -1;
}
}
/* retransmit graft if graft sent flag is still set */
if (gt->gt_grftsnt) {
register int y;
CHK_GS(gt->gt_grftsnt++, y);
if (y)
send_graft(gt);
}
/*
* Age prunes
*
* If a prune expires, forward again on that vif.
*/
ptnp = &gt->gt_pruntbl;
while ((pt = *ptnp) != NULL) {
if ((pt->pt_timer -= ROUTE_MAX_REPORT_DELAY) <= 0) {
log(LOG_DEBUG, 0, "expire prune (%s %s) from %s on vif %d",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(gt->gt_mcastgrp, s2),
inet_fmt(pt->pt_router, s3),
pt->pt_vifi);
/*
* No need to send a graft, any prunes that we sent
* will expire before any prunes that we have received.
*/
if (gt->gt_prsent_timer > 0) {
log(LOG_DEBUG, 0, "prune expired with %d left on %s",
gt->gt_prsent_timer, "prsent_timer");
gt->gt_prsent_timer = 0;
}
/* modify the kernel entry to forward packets */
if (!VIFM_ISSET(pt->pt_vifi, gt->gt_grpmems)) {
VIFM_SET(pt->pt_vifi, gt->gt_grpmems);
log(LOG_DEBUG, 0, "forw again (%s %s) gm:%x vif:%d",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(gt->gt_mcastgrp, s2), gt->gt_grpmems,
pt->pt_vifi);
prun_add_ttls(gt);
update_kernel(gt);
#ifdef RSRR
/* Send route change notification to reservation
* protocol.
*/
rsrr_cache_send(gt,1);
#endif /* RSRR */
}
/* remove the router's prune entry and await new one */
*ptnp = pt->pt_next;
free(pt);
} else {
ptnp = &pt->pt_next;
}
}
/*
* If the cache entry has expired, check for downstream prunes.
*
* If there are downstream prunes, refresh the cache entry's timer.
* Otherwise, check for traffic. If no traffic, delete this
* entry.
*/
if (gt->gt_timer <= 0) {
if (gt->gt_pruntbl) {
if (gt->gt_prsent_timer == -1)
gt->gt_prsent_timer = 0;
gt->gt_timer = CACHE_LIFETIME(cache_lifetime);
gtnptr = &gt->gt_gnext;
continue;
}
/*
* If this entry was pruned, but all downstream prunes
* have expired, then it is safe to simply delete it.
* Otherwise, check for traffic before deleting.
*/
if (gt->gt_prsent_timer == 0) {
sg_req.grp.s_addr = gt->gt_mcastgrp;
stnp = &gt->gt_srctbl;
while ((st = *stnp) != NULL) {
sg_req.src.s_addr = st->st_origin;
if (ioctl(udp_socket, SIOCGETSGCNT, (char *)&sg_req)
< 0) {
log(LOG_WARNING, errno, "%s (%s %s)",
"age_table_entry: SIOCGETSGCNT failing for",
inet_fmt(st->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
/* Make sure it gets deleted below */
sg_req.pktcnt = st->st_pktcnt;
}
if (sg_req.pktcnt == st->st_pktcnt) {
*stnp = st->st_next;
log(LOG_DEBUG, 0,
"age_table_entry deleting (%s %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
if (k_del_rg(st->st_origin, gt) < 0) {
log(LOG_WARNING, errno,
"age_table_entry trying to delete (%s %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
}
kroutes--;
free(st);
} else {
stnp = &st->st_next;
}
}
if (gt->gt_srctbl) {
/* At least one source in the list still has traffic */
gt->gt_timer = CACHE_LIFETIME(cache_lifetime);
gtnptr = &gt->gt_gnext;
continue;
}
}
log(LOG_DEBUG, 0, "timeout cache entry (%s, %s)",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(gt->gt_mcastgrp, s2));
/* free all the source entries */
while ((st = gt->gt_srctbl) != NULL) {
log(LOG_DEBUG, 0,
"age_table_entry (P) deleting (%s %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
if (k_del_rg(st->st_origin, gt) < 0) {
log(LOG_WARNING, errno,
"age_table_entry (P) trying to delete (%s %s)",
inet_fmt(st->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
}
kroutes--;
gt->gt_srctbl = st->st_next;
free(st);
}
/* free all the prune list entries */
while ((pt = gt->gt_pruntbl) != NULL) {
gt->gt_pruntbl = pt->pt_next;
free(pt);
}
if (gt->gt_prev)
gt->gt_prev->gt_next = gt->gt_next;
else
gt->gt_route->rt_groups = gt->gt_next;
if (gt->gt_next)
gt->gt_next->gt_prev = gt->gt_prev;
if (gt->gt_gprev) {
gt->gt_gprev->gt_gnext = gt->gt_gnext;
gtnptr = &gt->gt_gprev->gt_gnext;
} else {
kernel_table = gt->gt_gnext;
gtnptr = &kernel_table;
}
if (gt->gt_gnext)
gt->gt_gnext->gt_gprev = gt->gt_gprev;
#ifdef RSRR
/* Send route change notification to reservation protocol. */
rsrr_cache_send(gt,0);
rsrr_cache_clean(gt);
#endif /* RSRR */
free((char *)gt);
} else {
if (gt->gt_prsent_timer == -1)
gt->gt_prsent_timer = 0;
gtnptr = &gt->gt_gnext;
}
}
/*
* When traversing the no_route table, the decision is much easier.
* Just delete it if it has timed out.
*/
gtnptr = &kernel_no_route;
while ((gt = *gtnptr) != NULL) {
/* advance the timer for the kernel entry */
gt->gt_timer -= ROUTE_MAX_REPORT_DELAY;
if (gt->gt_timer < 0) {
if (gt->gt_srctbl) {
if (k_del_rg(gt->gt_srctbl->st_origin, gt) < 0) {
log(LOG_WARNING, errno, "%s (%s %s)",
"age_table_entry trying to delete no-route",
inet_fmt(gt->gt_srctbl->st_origin, s1),
inet_fmt(gt->gt_mcastgrp, s2));
}
free(gt->gt_srctbl);
}
*gtnptr = gt->gt_next;
if (gt->gt_next)
gt->gt_next->gt_prev = gt->gt_prev;
free((char *)gt);
} else {
gtnptr = &gt->gt_next;
}
}
}
static char *
scaletime(t)
u_long t;
{
static char buf1[5];
static char buf2[5];
static char *buf=buf1;
char s;
char *p;
p = buf;
if (buf == buf1)
buf = buf2;
else
buf = buf1;
if (t < 120) {
s = 's';
} else if (t < 3600) {
t /= 60;
s = 'm';
} else if (t < 86400) {
t /= 3600;
s = 'h';
} else if (t < 864000) {
t /= 86400;
s = 'd';
} else {
t /= 604800;
s = 'w';
}
if (t > 999)
return "*** ";
sprintf(p,"%3d%c", (int)t, s);
return p;
}
/*
* Print the contents of the cache table on file 'fp2'.
*/
void
dump_cache(fp2)
FILE *fp2;
{
register struct rtentry *r;
register struct gtable *gt;
register struct stable *st;
register struct ptable *pt;
register int i;
register time_t thyme = time(0);
fprintf(fp2,
"Multicast Routing Cache Table (%d entries)\n%s", kroutes,
" Origin Mcast-group CTmr Age Ptmr IVif Forwvifs\n");
for (gt = kernel_no_route; gt; gt = gt->gt_next) {
if (gt->gt_srctbl) {
fprintf(fp2, " %-18s %-15s %-4s %-4s - -1\n",
inet_fmts(gt->gt_srctbl->st_origin, 0xffffffff, s1),
inet_fmt(gt->gt_mcastgrp, s2), scaletime(gt->gt_timer),
scaletime(thyme - gt->gt_ctime));
fprintf(fp2, ">%s\n", inet_fmt(gt->gt_srctbl->st_origin, s1));
}
}
for (gt = kernel_table; gt; gt = gt->gt_gnext) {
r = gt->gt_route;
fprintf(fp2, " %-18s %-15s",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
inet_fmt(gt->gt_mcastgrp, s2));
fprintf(fp2, " %-4s", scaletime(gt->gt_timer));
fprintf(fp2, " %-4s %-4s ", scaletime(thyme - gt->gt_ctime),
gt->gt_prsent_timer ? scaletime(gt->gt_prsent_timer) :
" -");
fprintf(fp2, "%2u%c%c ", r->rt_parent,
gt->gt_prsent_timer ? 'P' : ' ',
VIFM_ISSET(r->rt_parent, gt->gt_scope) ? 'B' : ' ');
for (i = 0; i < numvifs; ++i) {
if (VIFM_ISSET(i, gt->gt_grpmems))
fprintf(fp2, " %u ", i);
else if (VIFM_ISSET(i, r->rt_children) &&
!VIFM_ISSET(i, r->rt_leaves))
fprintf(fp2, " %u%c", i,
VIFM_ISSET(i, gt->gt_scope) ? 'b' : 'p');
}
fprintf(fp2, "\n");
for (st = gt->gt_srctbl; st; st = st->st_next) {
fprintf(fp2, ">%s\n", inet_fmt(st->st_origin, s1));
}
#ifdef DEBUG_PRUNES
for (pt = gt->gt_pruntbl; pt; pt = pt->pt_next) {
fprintf(fp2, "<r:%s v:%d t:%d\n", inet_fmt(pt->pt_router, s1),
pt->pt_vifi, pt->pt_timer);
}
#endif
}
}
/*
* Traceroute function which returns traceroute replies to the requesting
* router. Also forwards the request to downstream routers.
*/
void
accept_mtrace(src, dst, group, data, no, datalen)
u_int32 src;
u_int32 dst;
u_int32 group;
char *data;
u_int no; /* promoted u_char */
int datalen;
{
u_char type;
struct rtentry *rt;
struct gtable *gt;
struct tr_query *qry;
struct tr_resp *resp;
int vifi;
char *p;
int rcount;
int errcode = TR_NO_ERR;
int resptype;
struct timeval tp;
struct sioc_vif_req v_req;
struct sioc_sg_req sg_req;
/* Remember qid across invocations */
static u_int32 oqid = 0;
/* timestamp the request/response */
gettimeofday(&tp, 0);
/*
* Check if it is a query or a response
*/
if (datalen == QLEN) {
type = QUERY;
log(LOG_DEBUG, 0, "Initial traceroute query rcvd from %s to %s",
inet_fmt(src, s1), inet_fmt(dst, s2));
}
else if ((datalen - QLEN) % RLEN == 0) {
type = RESP;
log(LOG_DEBUG, 0, "In-transit traceroute query rcvd from %s to %s",
inet_fmt(src, s1), inet_fmt(dst, s2));
if (IN_MULTICAST(ntohl(dst))) {
log(LOG_DEBUG, 0, "Dropping multicast response");
return;
}
}
else {
log(LOG_WARNING, 0, "%s from %s to %s",
"Non decipherable traceroute request recieved",
inet_fmt(src, s1), inet_fmt(dst, s2));
return;
}
qry = (struct tr_query *)data;
if (oqid == qry->tr_qid) {
/*
* If the multicast router is a member of the group being
* queried, and the query is multicasted, then the router can
* recieve multiple copies of the same query. If we have already
* replied to this traceroute, just ignore it this time.
*
* This is not a total solution, but since if this fails you
* only get N copies, N <= the number of interfaces on the router,
* it is not fatal.
*/
log(LOG_DEBUG, 0, "ignoring duplicate traceroute packet");
return;
}
/*
* if it is a packet with all reports filled, drop it
*/
if ((rcount = (datalen - QLEN)/RLEN) == no) {
log(LOG_DEBUG, 0, "packet with all reports filled in");
return;
}
log(LOG_DEBUG, 0, "s: %s g: %s d: %s ", inet_fmt(qry->tr_src, s1),
inet_fmt(group, s2), inet_fmt(qry->tr_dst, s3));
log(LOG_DEBUG, 0, "rttl: %d rd: %s", qry->tr_rttl,
inet_fmt(qry->tr_raddr, s1));
log(LOG_DEBUG, 0, "rcount:%d, qid:%06x", rcount, qry->tr_qid);
/* determine the routing table entry for this traceroute */
rt = determine_route(qry->tr_src);
if (rt) {
log(LOG_DEBUG, 0, "rt parent vif: %d rtr: %s metric: %d",
rt->rt_parent, inet_fmt(rt->rt_gateway, s1), rt->rt_metric);
log(LOG_DEBUG, 0, "rt origin %s",
inet_fmts(rt->rt_origin, rt->rt_originmask, s1));
} else
log(LOG_DEBUG, 0, "...no route");
/*
* Query type packet - check if rte exists
* Check if the query destination is a vif connected to me.
* and if so, whether I should start response back
*/
if (type == QUERY) {
if (rt == NULL) {
log(LOG_DEBUG, 0, "Mcast traceroute: no route entry %s",
inet_fmt(qry->tr_src, s1));
if (IN_MULTICAST(ntohl(dst)))
return;
}
vifi = find_vif(qry->tr_dst, 0);
if (vifi == NO_VIF) {
/* The traceroute destination is not on one of my subnet vifs. */
log(LOG_DEBUG, 0, "Destination %s not an interface",
inet_fmt(qry->tr_dst, s1));
if (IN_MULTICAST(ntohl(dst)))
return;
errcode = TR_WRONG_IF;
} else if (rt != NULL && !VIFM_ISSET(vifi, rt->rt_children)) {
log(LOG_DEBUG, 0, "Destination %s not on forwarding tree for src %s",
inet_fmt(qry->tr_dst, s1), inet_fmt(qry->tr_src, s2));
if (IN_MULTICAST(ntohl(dst)))
return;
errcode = TR_WRONG_IF;
}
}
else {
/*
* determine which interface the packet came in on
* RESP packets travel hop-by-hop so this either traversed
* a tunnel or came from a directly attached mrouter.
*/
if ((vifi = find_vif(src, dst)) == NO_VIF) {
log(LOG_DEBUG, 0, "Wrong interface for packet");
errcode = TR_WRONG_IF;
}
}
/* Now that we've decided to send a response, save the qid */
oqid = qry->tr_qid;
log(LOG_DEBUG, 0, "Sending traceroute response");
/* copy the packet to the sending buffer */
p = send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN;
bcopy(data, p, datalen);
p += datalen;
/*
* If there is no room to insert our reply, coopt the previous hop
* error indication to relay this fact.
*/
if (p + sizeof(struct tr_resp) > send_buf + RECV_BUF_SIZE) {
resp = (struct tr_resp *)p - 1;
resp->tr_rflags = TR_NO_SPACE;
rt = NULL;
goto sendit;
}
/*
* fill in initial response fields
*/
resp = (struct tr_resp *)p;
bzero(resp, sizeof(struct tr_resp));
datalen += RLEN;
resp->tr_qarr = htonl((tp.tv_sec + JAN_1970) << 16) +
((tp.tv_usec >> 4) & 0xffff);
resp->tr_rproto = PROTO_DVMRP;
if (errcode != TR_NO_ERR) {
resp->tr_rflags = errcode;
rt = NULL; /* hack to enforce send straight to requestor */
goto sendit;
}
resp->tr_outaddr = uvifs[vifi].uv_lcl_addr;
resp->tr_fttl = uvifs[vifi].uv_threshold;
resp->tr_rflags = TR_NO_ERR;
/*
* obtain # of packets out on interface
*/
v_req.vifi = vifi;
if (ioctl(udp_socket, SIOCGETVIFCNT, (char *)&v_req) >= 0)
resp->tr_vifout = htonl(v_req.ocount);
/*
* fill in scoping & pruning information
*/
if (rt)
for (gt = rt->rt_groups; gt; gt = gt->gt_next) {
if (gt->gt_mcastgrp >= group)
break;
}
else
gt = NULL;
if (gt && gt->gt_mcastgrp == group) {
sg_req.src.s_addr = qry->tr_src;
sg_req.grp.s_addr = group;
if (ioctl(udp_socket, SIOCGETSGCNT, (char *)&sg_req) >= 0)
resp->tr_pktcnt = htonl(sg_req.pktcnt);
if (VIFM_ISSET(vifi, gt->gt_scope))
resp->tr_rflags = TR_SCOPED;
else if (gt->gt_prsent_timer)
resp->tr_rflags = TR_PRUNED;
else if (!VIFM_ISSET(vifi, gt->gt_grpmems))
if (VIFM_ISSET(vifi, rt->rt_children) &&
!VIFM_ISSET(vifi, rt->rt_leaves))
resp->tr_rflags = TR_OPRUNED;
else
resp->tr_rflags = TR_NO_FWD;
} else {
if (scoped_addr(vifi, group))
resp->tr_rflags = TR_SCOPED;
else if (rt && !VIFM_ISSET(vifi, rt->rt_children))
resp->tr_rflags = TR_NO_FWD;
}
/*
* if no rte exists, set NO_RTE error
*/
if (rt == NULL) {
src = dst; /* the dst address of resp. pkt */
resp->tr_inaddr = 0;
resp->tr_rflags = TR_NO_RTE;
resp->tr_rmtaddr = 0;
} else {
/* get # of packets in on interface */
v_req.vifi = rt->rt_parent;
if (ioctl(udp_socket, SIOCGETVIFCNT, (char *)&v_req) >= 0)
resp->tr_vifin = htonl(v_req.icount);
MASK_TO_VAL(rt->rt_originmask, resp->tr_smask);
src = uvifs[rt->rt_parent].uv_lcl_addr;
resp->tr_inaddr = src;
resp->tr_rmtaddr = rt->rt_gateway;
if (!VIFM_ISSET(vifi, rt->rt_children)) {
log(LOG_DEBUG, 0, "Destination %s not on forwarding tree for src %s",
inet_fmt(qry->tr_dst, s1), inet_fmt(qry->tr_src, s2));
resp->tr_rflags = TR_WRONG_IF;
}
if (rt->rt_metric >= UNREACHABLE) {
resp->tr_rflags = TR_NO_RTE;
/* Hack to send reply directly */
rt = NULL;
}
}
sendit:
/*
* if metric is 1 or no. of reports is 1, send response to requestor
* else send to upstream router. If the upstream router can't handle
* mtrace, set an error code and send to requestor anyway.
*/
log(LOG_DEBUG, 0, "rcount:%d, no:%d", rcount, no);
if ((rcount + 1 == no) || (rt == NULL) || (rt->rt_metric == 1)) {
resptype = IGMP_MTRACE_RESP;
dst = qry->tr_raddr;
} else
if (!can_mtrace(rt->rt_parent, rt->rt_gateway)) {
dst = qry->tr_raddr;
resp->tr_rflags = TR_OLD_ROUTER;
resptype = IGMP_MTRACE_RESP;
} else {
dst = rt->rt_gateway;
resptype = IGMP_MTRACE;
}
if (IN_MULTICAST(ntohl(dst))) {
/*
* Send the reply on a known multicast capable vif.
* If we don't have one, we can't source any multicasts anyway.
*/
if (phys_vif != -1) {
log(LOG_DEBUG, 0, "Sending reply to %s from %s",
inet_fmt(dst, s1), inet_fmt(uvifs[phys_vif].uv_lcl_addr, s2));
k_set_ttl(qry->tr_rttl);
send_igmp(uvifs[phys_vif].uv_lcl_addr, dst,
resptype, no, group,
datalen);
k_set_ttl(1);
} else
log(LOG_INFO, 0, "No enabled phyints -- %s",
"dropping traceroute reply");
} else {
log(LOG_DEBUG, 0, "Sending %s to %s from %s",
resptype == IGMP_MTRACE_RESP ? "reply" : "request on",
inet_fmt(dst, s1), inet_fmt(src, s2));
send_igmp(src, dst,
resptype, no, group,
datalen);
}
return;
}
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