/**
* parseBSR - Parse the candidate BSR configured information.
* @s: String token
*
* Syntax:
* cand_bootstrap_router [address | ifname] [priority <0-255>]
*/
int parseBSR(char *s)
{
char *w;
uint32_t local = INADDR_ANY_N;
uint32_t priority = PIM_DEFAULT_BSR_PRIORITY;
cand_bsr_flag = FALSE;
while (!EQUAL((w = next_word(&s)), "")) {
if (EQUAL(w, "priority")) {
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing Cand-BSR priority, defaulting to %u", PIM_DEFAULT_BSR_PRIORITY);
priority = PIM_DEFAULT_BSR_PRIORITY;
continue;
}
if (sscanf(w, "%u", &priority) != 1) {
WARN("Invalid Cand-BSR priority %s, defaulting to %u", PIM_DEFAULT_BSR_PRIORITY);
priority = PIM_DEFAULT_BSR_PRIORITY;
continue;
}
if (priority > PIM_MAX_CAND_BSR_PRIORITY) {
WARN("Too high Cand-BSR priority %u, defaulting to %d", priority, PIM_MAX_CAND_BSR_PRIORITY);
priority = PIM_MAX_CAND_BSR_PRIORITY;
}
my_bsr_priority = (u_int8)priority;
continue;
}
/* Cand-BSR interface or address */
local = ifname2addr(w);
if (!local)
local = inet_parse(w, 4);
if (!inet_valid_host(local)) {
local = max_local_address();
WARN("Invalid Cand-BSR address '%s', defaulting to %s", w, inet_fmt(local, s1, sizeof(s1)));
continue;
}
if (local_address(local) == NO_VIF) {
local = max_local_address();
WARN("Cand-BSR address '%s' is not local, defaulting to %s", w, inet_fmt(local, s1, sizeof(s1)));
}
}
if (local == INADDR_ANY_N) {
/* If address not provided, use the max. local */
local = max_local_address();
}
my_bsr_address = local;
my_bsr_priority = priority;
MASKLEN_TO_MASK(RP_DEFAULT_IPV4_HASHMASKLEN, my_bsr_hash_mask);
cand_bsr_flag = TRUE;
logit(LOG_INFO, 0, "Local Cand-BSR address %s, priority %u", inet_fmt(local, s1, sizeof(s1)), priority);
return TRUE;
}
/*
* Leave a multicast group on virtual interface 'v'.
*/
void k_leave(int socket, u_int32 grp, struct uvif *v)
{
#ifdef __linux__
struct ip_mreqn mreq;
#else
struct ip_mreq mreq;
#endif /* __linux__ */
#ifdef __linux__
mreq.imr_ifindex = v->uv_ifindex;
mreq.imr_address.s_addr = v->uv_lcl_addr;
#else
mreq.imr_interface.s_addr = v->uv_lcl_addr;
#endif /* __linux__ */
mreq.imr_multiaddr.s_addr = grp;
if (setsockopt(socket, IPPROTO_IP, IP_DROP_MEMBERSHIP, (char *)&mreq, sizeof(mreq)) < 0) {
#ifdef __linux__
logit(LOG_WARNING, errno,
"Cannot leave group %s on interface %s (ifindex %d)",
inet_fmt(grp, s1, sizeof(s1)), inet_fmt(v->uv_lcl_addr, s2, sizeof(s2)), v->uv_ifindex);
#else
logit(LOG_WARNING, errno,
"Cannot leave group %s on interface %s",
inet_fmt(grp, s1, sizeof(s1)), inet_fmt(v->uv_lcl_addr, s2, sizeof(s2)));
#endif /* __linux__ */
}
}
/*
* Start routing on all virtual interfaces that are not down or
* administratively disabled.
*/
void init_installvifs(void)
{
vifi_t vifi;
struct uvif *v;
logit(LOG_INFO, 0, "Installing vifs in kernel...");
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (!(v->uv_flags & VIFF_DISABLED)) {
if (!(v->uv_flags & VIFF_DOWN)) {
if (v->uv_flags & VIFF_TUNNEL) {
logit(LOG_INFO, 0, "vif #%d, tunnel %s -> %s", vifi,
inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)),
inet_fmt(v->uv_rmt_addr, s2, sizeof(s2)));
} else {
logit(LOG_INFO, 0, "vif #%d, phyint %s", vifi,
inet_fmt(v->uv_lcl_addr, s1, sizeof(s1)));
}
k_add_vif(vifi, &uvifs[vifi]);
} else {
logit(LOG_INFO, 0, "%s is not yet up; vif #%u not in service",
v->uv_name, vifi);
}
}
}
}
JNIEXPORT void JNICALL Java_ow_ipmulticast_Native_sendMulticast(JNIEnv *env, jclass clazz,
jint srcaddr, jint srcport, jint destaddr, jint destport, jint id, jint ttl, jint datalen, jbyteArray jdata) {
jsize datasize;
jbyte *data;
srcaddr = htonl(srcaddr);
destaddr = htonl(destaddr);
if (jdata != NULL) {
datasize = (*env)->GetArrayLength(env, jdata);
data = (*env)->GetByteArrayElements(env, jdata, NULL);
}
else {
datasize = 0;
data = NULL;
}
if (datalen > datasize) {
datalen = datasize;
}
#if 0
printf("send\n");
printf(" src: %s\n", inet_fmt(srcaddr, s1));
printf(" dest: %s:%d\n", inet_fmt(destaddr, s1), destport);
printf(" datasize: %d\n", datasize);
printf(" datalen: %d\n", datalen);
fflush(stdout);
#endif
send_dgram((uint32_t)srcaddr, (uint16_t)srcport, (uint32_t)destaddr, (uint16_t)destport, (uint16_t)id, (uint8_t)ttl, (char *)data, (int)datalen);
if (jdata != NULL) {
(*env)->ReleaseByteArrayElements(env, jdata, data, JNI_ABORT);
}
}
JNIEXPORT void JNICALL Java_ow_ipmulticast_Native_sendIGMP(JNIEnv *env, jclass clazz,
jint src, jint dest, jint type, jint code, jint group, jbyteArray jdata) {
jsize datalen;
jbyte *data;
src = htonl(src);
dest = htonl(dest);
group = htonl(group);
if (jdata != NULL) {
datalen = (*env)->GetArrayLength(env, jdata);
data = (*env)->GetByteArrayElements(env, jdata, NULL);
}
else {
datalen = 0;
data = NULL;
}
#if 0
printf("send\n");
printf(" src: %s\n", inet_fmt(src, s1));
printf(" dest: %s\n", inet_fmt(dest, s1));
printf(" group: %s\n", inet_fmt(group, s1));
printf(" datalen: %d\n", datalen);
fflush(stdout);
#endif
send_igmp((uint32_t)src, (uint32_t)dest, (int)type, (int)code, (uint32_t)group, (char *)data, (int)datalen);
if (jdata != NULL) {
(*env)->ReleaseByteArrayElements(env, jdata, data, JNI_ABORT);
}
}
/*
* Dumps the local Cand-RP-set
*/
int dump_rp_set(FILE *fp)
{
cand_rp_t *rp;
rp_grp_entry_t *rpgrp;
fprintf(fp, "Candidate Rendezvous-Point Set ===============================================\n");
fprintf(fp, "RP address Incoming Group Prefix Priority Holdtime\n");
fprintf(fp, "--------------- -------- ------------------ -------- ---------------------\n");
for (rp = cand_rp_list; rp; rp = rp->next) {
fprintf(fp, "%-15s %-8d ",
inet_fmt(rp->rpentry->address, s1, sizeof(s1)),
rp->rpentry->incoming);
rpgrp = rp->rp_grp_next;
if (rpgrp) {
dump_rpgrp(fp, rpgrp, 0);
for (rpgrp = rpgrp->rp_grp_next; rpgrp; rpgrp = rpgrp->rp_grp_next)
dump_rpgrp(fp, rpgrp, 1);
}
}
fprintf(fp, "------------------------------------------------------------------------------\n");
fprintf(fp, "Current BSR address: %s\n\n", inet_fmt(curr_bsr_address, s1, sizeof(s1)));
return TRUE;
}
void delete_single_kernel_cache(mrtentry_t *mrt, kernel_cache_t *node)
{
if (!mrt || !node)
return;
if (!node->prev) {
mrt->kernel_cache = node->next;
if (!mrt->kernel_cache)
mrt->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
} else {
node->prev->next = node->next;
}
if (node->next)
node->next->prev = node->prev;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet_fmt(node->source, s1, sizeof(s1)),
inet_fmt(node->group, s2, sizeof(s2)));
}
k_del_mfc(igmp_socket, node->source, node->group);
free(node);
}
void pim_input()
{//接收，检查报文类型，交由相应的函数处理
int length;
u_int32 src,dst;
struct ip *ip;
struct pim *pim;
int iphdrlen,pimlen;
length=recvfrom(pimsocket,pim_receive_buf,64*1024,0,NULL,NULL);
if(length<sizeof(struct ip))
{
log(LOG_INFO,"PIM packet too short,receive failed!");
}
ip=(struct ip *)pim_receive_buf;
src=ip->ip_src.s_addr;
dst=ip->ip_dst.s_addr;
iphdrlen=ip->ip_hl<<2;
pim=(struct pim *)(pim_receive_buf+iphdrlen);
pimlen=length-iphdrlen;
if (pimlen<sizeof(pim))
{
log(LOG_INFO,"PIM packet too short,receive failed!");
return;
}
switch (pim->pim_type)
{
case PIM_HELLO:
receive_hello(src,dst,(char *)(pim),pimlen);
return;
case PIM_JOIN_PRUNE:
receive_join_prune(src,dst,(char *)(pim),pimlen);
return;
case PIM_ASSERT:
receive_assert(src,dst,(char *)(pim),pimlen);
return;
case PIM_GRAFT:
receive_pim_graft(src,dst,(char *)(pim),pimlen);
return;
case PIM_GRAFT_ACK:
receive_pim_graft_ack(src,dst,(char *)(pim),pimlen);
return;
default:
log(LOG_INFO,"ignoring unused PIM packet from %s to %s",inet_fmt(src, s1), inet_fmt(dst, s2));
return;
}
}
void delete_single_kernel_cache_addr(mrtentry_t *mrt, uint32_t source, uint32_t group)
{
uint32_t source_h;
uint32_t group_h;
kernel_cache_t *node;
if (!mrt)
return;
source_h = ntohl(source);
group_h = ntohl(group);
/* Find the exact (S,G) kernel_cache entry */
for (node = mrt->kernel_cache; node; node = node->next) {
if (ntohl(node->group) < group_h)
continue;
if (ntohl(node->group) > group_h)
return; /* Not found */
if (ntohl(node->source) < source_h)
continue;
if (ntohl(node->source) > source_h)
return; /* Not found */
/* Found exact match */
break;
}
if (!node)
return;
/* Found. Delete it */
if (!node->prev) {
mrt->kernel_cache = node->next;
if (!mrt->kernel_cache)
mrt->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
} else{
node->prev->next = node->next;
}
if (node->next)
node->next->prev = node->prev;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet_fmt(node->source, s1, sizeof(s1)),
inet_fmt(node->group, s2, sizeof(s2)));
}
logit(LOG_DEBUG, 0, "delete_single_kernel_cache_addr: SG");
k_del_mfc(igmp_socket, node->source, node->group);
free(node);
}
/*
* Print the contents of the routing table on file 'fp'.
*/
void
dump_routes(FILE *fp)
{
register struct rtentry *r;
register vifi_t i;
fprintf(fp,
"Multicast Routing Table (%u %s)\n%s\n",
nroutes, (nroutes == 1) ? "entry" : "entries",
" Origin-Subnet From-Gateway Metric Tmr In-Vif Out-Vifs");
for (r = routing_table; r != NULL; r = r->rt_next) {
fprintf(fp, " %-18s %-15s ",
inet_fmts(r->rt_origin, r->rt_originmask, s1),
(r->rt_gateway == 0) ? "" : inet_fmt(r->rt_gateway, s2));
fprintf(fp, (r->rt_metric == UNREACHABLE) ? " NR " : "%4u ",
r->rt_metric);
fprintf(fp, " %3u %3u ", r->rt_timer, r->rt_parent);
for (i = 0; i < numvifs; ++i) {
if (VIFM_ISSET(i, r->rt_children)) {
fprintf(fp, " %u%c",
i, VIFM_ISSET(i, r->rt_leaves) ? '*' : ' ');
}
}
fprintf(fp, "\n");
}
fprintf(fp, "\n");
}
void pim_assert_output(u_int32 source,u_int32 group,vifi_t vif,u_int32 preference,u_int32 metric)
{//发送assert
char *mydata;
struct encode_unicast_option *unicast_option;
struct encode_group_address *group_address;
u_int32 *mypreference;
u_int32 *mymetric;
u_int32 *unicast_address;
int length;
mydata=(char *)(pim_send_buf+sizeof(struct ip)+sizeof(struct pim));
group_address=(struct encode_group_address *)mydata;
group_address->address_family=1;
group_address->encode_type=0;
group_address->reserved=0;
group_address->mask_len=32;
group_address->group_address=group;
mydata=mydata+sizeof(struct encode_group_address);
unicast_option=(struct encode_unicast_option *)mydata;
unicast_option->address_family=1;//协议族是ipv4
unicast_option->encode_type=0;
mydata=mydata+sizeof(struct encode_unicast_option);
unicast_address=(u_int32 *)mydata;
*unicast_address=source;
mydata=mydata+sizeof(u_int32);
mypreference=(u_int32 *)mydata;
*mypreference=preference;
mydata=mydata+sizeof(u_int32);
mymetric=(u_int32 *)mydata;
*mymetric=metric;
length=sizeof(struct encode_group_address)+sizeof(struct encode_group_address)+2*sizeof(u_int32);
if(pimdm_output(pim_send_buf,myvifs[vif].address,allpimrouters,PIM_ASSERT,length)!=1)
{
log(LOG_INFO,"Send Pim Assert Packet On %s(%s) Error!",myvifs[vif].name,inet_fmt(myvifs[vif].address,s1));
}
else
{
log(LOG_INFO,"Send Pim Assert Packet On %s(%s) Success!",myvifs[vif].name,inet_fmt(myvifs[vif].address,s1));
}
return;
}
/**
* parse_group_prefix - Parse group_prefix configured information.
* @s: String token
* Syntax:
* group_prefix <group-addr>[/<masklen>]
* <group-addr> [masklen <masklen>]
*
* Returns:
* %TRUE if the parsing was successful, o.w. %FALSE
*/
int parse_group_prefix(char *s)
{
char *w;
uint32_t group_addr;
uint32_t masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
w = next_word(&s);
if (EQUAL(w, "")) {
WARN("Missing group_prefix address");
return FALSE;
}
parse_prefix_len (w, &masklen);
group_addr = inet_parse(w, 4);
if (!IN_MULTICAST(ntohl(group_addr))) {
WARN("Group address '%s' is not a valid multicast address", inet_fmt(group_addr, s1, sizeof(s1)));
return FALSE;
}
/* Was if (!(~(*cand_rp_adv_message.prefix_cnt_ptr))) which Arm GCC 4.4.2 dislikes:
* --> "config.c:693: warning: promoted ~unsigned is always non-zero"
* The prefix_cnt_ptr is a u_int8 so it seems this check was to prevent overruns.
* I've changed the check to see if we've already read 255 entries, if so the cnt
* is maximized and we need to tell the user. --Joachim Nilsson 2010-01-16 */
if (*cand_rp_adv_message.prefix_cnt_ptr == 255) {
WARN("Too many multicast groups configured!");
return FALSE;
}
if (EQUAL((w = next_word(&s)), "masklen")) {
w = next_word(&s);
if (!sscanf(w, "%u", &masklen))
masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
}
validate_prefix_len(&masklen);
PUT_EGADDR(group_addr, (u_int8)masklen, 0, cand_rp_adv_message.insert_data_ptr);
(*cand_rp_adv_message.prefix_cnt_ptr)++;
logit(LOG_INFO, 0, "Adding Cand-RP group prefix %s/%d", inet_fmt(group_addr, s1, sizeof(s1)), masklen);
return TRUE;
}
/*
* function name: parseBSR
* input: char *s
* output: int
* operation: parse the candidate BSR configured information.
* General form:
* 'cand_bootstrap_router <local-addr> [priority <number>]'.
*/
int parseBSR(char *s)
{
char *w;
u_int32 local = INADDR_ANY_N;
u_int32 priority = PIM_DEFAULT_BSR_PRIORITY;
cand_bsr_flag = FALSE;
while (!EQUAL((w = next_word(&s)), "")) {
if (EQUAL(w, "priority")) {
if (EQUAL((w = next_word(&s)), "")) {
logit(LOG_WARNING, 0,
"Missing priority; set to default %u (0 is lowest)\n",
PIM_DEFAULT_BSR_PRIORITY);
priority = PIM_DEFAULT_BSR_PRIORITY;
continue;
}
if (sscanf(w, "%u", &priority) != 1) {
logit(LOG_WARNING, 0,
"invalid priority %s; set to default %u (0 is lowest)",
PIM_DEFAULT_BSR_PRIORITY);
priority = PIM_DEFAULT_BSR_PRIORITY;
continue;
}
if (priority > (my_bsr_priority = ~0))
priority = my_bsr_priority;
my_bsr_priority = (u_int8)priority;
continue;
}
/* BSR address */
local = inet_parse(w, 4);
if (!inet_valid_host(local)) {
local = max_local_address();
logit(LOG_WARNING, 0, "Invalid BSR address provided '%s' in %s. Will use the largest enabled local address.",
w, configfilename);
continue;
}
if (local_address(local) == NO_VIF) {
local = max_local_address();
logit(LOG_WARNING, 0,
"Cand-BSR address is not local '%s' in %s. Will use the largest enabled local address.",
w, configfilename);
}
} /* while not empty */
if (local == INADDR_ANY_N)
/* If address not provided, use the max. local */
local = max_local_address();
my_bsr_address = local;
my_bsr_priority = priority;
MASKLEN_TO_MASK(RP_DEFAULT_IPV4_HASHMASKLEN, my_bsr_hash_mask);
cand_bsr_flag = TRUE;
logit(LOG_INFO, 0, "Local Cand-BSR address is %s", inet_fmt(local, s1, sizeof(s1)));
logit(LOG_INFO, 0, "Local Cand-BSR priority is %u", priority);
return TRUE;
}
static grpentry_t *create_grpentry(u_int32 group)
{
grpentry_t *node;
grpentry_t *prev;
/* If already exists, return it. Otheriwse search_grplist() returns the
* insertion point in prev. */
if (search_grplist(group, &prev) == TRUE)
return prev;
node = calloc(1, sizeof(grpentry_t));
if (!node) {
logit(LOG_WARNING, 0, "Memory allocation error for grpentry %s",
inet_fmt(group, s1, sizeof(s1)));
return NULL;
}
/*
* TODO: XXX: Note that this is NOT a (*,G) routing entry, but simply
* a group entry, probably used to search the routing table (to find
* (S,G) entries for example.)
* To become (*,G) routing entry, we must setup node->grp_route
*/
node->group = group;
node->rpaddr = INADDR_ANY_N;
node->mrtlink = NULL;
node->active_rp_grp = NULL;
node->grp_route = NULL;
node->rpnext = NULL;
node->rpprev = NULL;
/* Now it is safe to include the new group entry */
node->next = prev->next;
prev->next = node;
node->prev = prev;
if (node->next)
node->next->prev = node;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "create group entry, group %s", inet_fmt(group, s1, sizeof(s1)));
}
return node;
}
void receive_hello(u_int32 src,u_int32 dst,char *data,int length)
{//收到Hello报文
vifi_t vif;
struct pim_neighbor *pimneighbor;
int holdtime;
vif=find_vif_direct(src);
if(valid_packet(src,data,length)==0)
{
return;
}
holdtime=get_hold_time(data,length);
if(holdtime==-1)
{
log(LOG_INFO,"Get hold time error!");
}
log(LOG_INFO,"Receive PIM Hello message,get Hold time=%d from %s",holdtime,inet_fmt(src,s1));
for(pimneighbor=myvifs[vif].neighbor;pimneighbor!=NULL;pimneighbor=pimneighbor->next)
{
if(pimneighbor->address==src)
{
if(holdtime==0)
{
delete_pim_neighbor(pimneighbor);
return;
}
pimneighbor->holdtime=holdtime;
if(pimneighbor->timeoutid!=-1)
{
timer_clearTimer(pimneighbor->timeoutid);
}
pimneighbor->timeoutid=timer_setTimer(holdtime,delete_pim_neighbor,pimneighbor);
log(LOG_INFO,"Refresh hold time of neighbor %s to %d",inet_fmt(pimneighbor->address,s1),holdtime);
return;
}
}
add_pim_neighbor(src,holdtime,vif);
return;
//根据所得到的时间，采取相应的操作*/
}
/*
* Process an incoming host membership query
*/
void accept_membership_query(u_int32 src, u_int32 dst __attribute__((unused)), u_int32 group, int tmo)
{
vifi_t vifi;
struct uvif *v;
/* Ignore my own membership query */
if (local_address(src) != NO_VIF)
return;
/* TODO: modify for DVMRP?? */
if ((vifi = find_vif_direct(src)) == NO_VIF) {
IF_DEBUG(DEBUG_IGMP)
logit(LOG_INFO, 0,
"ignoring group membership query from non-adjacent host %s",
inet_fmt(src, s1, sizeof(s1)));
return;
}
v = &uvifs[vifi];
if ((tmo == 0 && !(v->uv_flags & VIFF_IGMPV1)) ||
(tmo != 0 && (v->uv_flags & VIFF_IGMPV1))) {
int i;
/*
* Exponentially back-off warning rate
*/
i = ++v->uv_igmpv1_warn;
while (i && !(i & 1))
i >>= 1;
if (i == 1) {
logit(LOG_WARNING, 0, "%s %s on vif %d, %s",
tmo == 0 ? "Received IGMPv1 report from"
: "Received IGMPv2 report from",
inet_fmt(src, s1, sizeof(s1)),
vifi,
tmo == 0 ? "please configure vif for IGMPv1"
: "but I am configured for IGMPv1");
}
}
/*
* function name: parse_group_prefix
* input: char *s
* output: int
* operation: parse group_prefix configured information.
* General form: 'group_prefix <group-addr> [masklen <masklen>]'.
*/
int parse_group_prefix(char *s)
{
char *w;
u_int32 group_addr;
u_int32 masklen;
w = next_word(&s);
if (EQUAL(w, "")) {
logit(LOG_WARNING, 0,
"Configuration error for 'group_prefix' in %s: no group_addr. Ignoring...", configfilename);
return FALSE;
}
group_addr = inet_parse(w, 4);
if (!IN_MULTICAST(ntohl(group_addr))) {
logit(LOG_WARNING, 0,
"Config error for 'group_prefix' in %s: %s is not a mcast addr. Ignoring...", configfilename, inet_fmt(group_addr, s1, sizeof(s1)));
return FALSE;
}
/* Was if (!(~(*cand_rp_adv_message.prefix_cnt_ptr))) which Arm GCC 4.4.2 dislikes:
* --> "config.c:693: warning: promoted ~unsigned is always non-zero"
* The prefix_cnt_ptr is a u_int8 so it seems this check was to prevent overruns.
* I've changed the check to see if we've already read 255 entries, if so the cnt
* is maximized and we need to tell the user. --Joachim Nilsson 2010-01-16 */
if (*cand_rp_adv_message.prefix_cnt_ptr == 255) {
logit(LOG_WARNING, 0,
"Too many group_prefix configured. Truncating...");
return FALSE;
}
if (EQUAL((w = next_word(&s)), "masklen")) {
w = next_word(&s);
if (sscanf(w, "%u", &masklen) == 1) {
if (masklen > (sizeof(group_addr)*8))
masklen = (sizeof(group_addr)*8);
else if (masklen < 4)
masklen = 4;
}
else
masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
}
else
masklen = PIM_GROUP_PREFIX_DEFAULT_MASKLEN;
PUT_EGADDR(group_addr, (u_int8)masklen, 0,
cand_rp_adv_message.insert_data_ptr);
(*cand_rp_adv_message.prefix_cnt_ptr)++;
logit(LOG_INFO, 0, "Adding prefix %s/%d", inet_fmt(group_addr, s1, sizeof(s1)), masklen);
return TRUE;
}
void pim_graft_output(struct mrt *mrtdata)
{//
struct mrt *mymrt;
struct pim_join_prune_header *graftheader;
struct pim_join_prune_group *graftgroup;
struct encode_source_address *source_address;
struct encode_unicast_option *unicast_option;
int length;
char *mydata;
mymrt=mrtdata;
mydata=(char *)(pim_send_buf+sizeof(struct ip)+sizeof(struct pim));
unicast_option=(struct encode_unicast_option *)mydata;
unicast_option->address_family=1;//协议族是ipv4
unicast_option->encode_type=0;
mydata=mydata+sizeof(struct encode_unicast_option);
graftheader=(struct pim_join_prune_header *)mydata;
graftheader->upstream=mymrt->upstream;
graftheader->reserved=0;
graftheader->num_groups=1;
graftheader->holdtime=0;
mydata=mydata+sizeof(struct pim_join_prune_header);
graftgroup=(struct pim_join_prune_group *)mydata;
graftgroup->group_address.address_family=1;
graftgroup->group_address.encode_type=0;
graftgroup->group_address.reserved=0;
graftgroup->group_address.mask_len=32;
graftgroup->group_address.group_address=mymrt->group;
mydata=mydata+sizeof(struct pim_join_prune_group);
graftgroup->join_number=htons(1);
graftgroup->prune_number=0;
source_address=(struct encode_source_address *)mydata;
source_address->address_family=1;
source_address->encode_type=0;
source_address->reserved=0;
source_address->mask_len=32;
source_address->source_address=mymrt->source;
length=sizeof(struct encode_unicast_option)+sizeof(struct pim_join_prune_header)+sizeof(struct pim_join_prune_group)+sizeof(struct encode_source_address);
if(pimdm_output(pim_send_buf,myvifs[mymrt->incoming].address,mymrt->upstream,PIM_GRAFT,length)!=1)
{
log(LOG_INFO,"Send Pim Graft Packet On %s(%s) Error!",myvifs[mymrt->incoming].name,inet_fmt(myvifs[mymrt->incoming].address,s1));
}
else
{
log(LOG_INFO,"Send Pim Graft Packet On %s(%s) Success!",myvifs[mymrt->incoming].name,inet_fmt(myvifs[mymrt->incoming].address,s1));
}
}
/*
* Call build_igmp() to build an IGMP message in the output packet buffer.
* Then send the message from the interface with IP address 'src' to
* destination 'dst'.
*/
void send_igmp(u_int32 src, u_int32 dst, int type, int code, u_int32 group, int datalen)
{
struct sockaddr_in sdst;
int setloop = 0;
size_t len;
len = build_igmp(src, dst, type, code, group, datalen);
if (IN_MULTICAST(ntohl(dst))) {
k_set_if(src);
if (type != IGMP_DVMRP || dst == allhosts_group) {
setloop = 1;
k_set_loop(TRUE);
}
}
memset(&sdst, 0, sizeof(sdst));
sdst.sin_family = AF_INET;
#ifdef HAVE_SA_LEN
sdst.sin_len = sizeof(sdst);
#endif
sdst.sin_addr.s_addr = dst;
if (sendto(igmp_socket, send_buf, len, 0, (struct sockaddr *)&sdst, sizeof(sdst)) < 0) {
if (errno == ENETDOWN)
check_vif_state();
else
logit(igmp_log_level(type, code), errno,
"sendto to %s on %s",
inet_fmt(dst, s1, sizeof(s1)), inet_fmt(src, s2, sizeof(s2)));
}
if (setloop)
k_set_loop(FALSE);
IF_DEBUG(DEBUG_PKT|igmp_debug_kind(type, code))
logit(LOG_DEBUG, 0, "SENT %s from %-15s to %s",
igmp_packet_kind(type, code), src == INADDR_ANY ? "INADDR_ANY" :
inet_fmt(src, s1, sizeof(s1)), inet_fmt(dst, s2, sizeof(s2)));
}
void set_prune(void *data)
{//在prune计时器超时后，执行操作
struct pim_prune_data *prunedata;
struct mrt *mymrt;
log(LOG_INFO,"Begin Prune");
prunedata=(struct pim_prune_data *)data;
mymrt=find_sg(prunedata->source,prunedata->group);
log(LOG_INFO,"Prune source:%s Group:%s",inet_fmt(prunedata->source,s1),inet_fmt(prunedata->group,s2));
if(mymrt==NULL)
{
return;
}
else
{
mymrt->prune_delay_timer_id[prunedata->vif]=0;
mymrt->outvif[prunedata->vif]=0;
change_mfc(igmpsocket,mymrt->source,mymrt->group,mymrt->incoming);
check_pim_state(DEL_LEAF);
log(LOG_INFO,"miss,handle set the prune");
mymrt->prune_timer_id[prunedata->vif]=timer_setTimer(5,prune_time_out,prunedata);
}
}
/*
* Set the IP_MULTICAST_IF option on local interface ifa.
*/
void k_set_if(int socket, u_int32 ifa)
{
struct in_addr adr;
adr.s_addr = ifa;
if (setsockopt(socket, IPPROTO_IP, IP_MULTICAST_IF, (char *)&adr, sizeof(adr)) < 0) {
if (errno == EADDRNOTAVAIL || errno == EINVAL)
return;
logit(LOG_ERR, errno, "Failed setting IP_MULTICAST_IF option on %s",
inet_fmt(adr.s_addr, s1, sizeof(s1)));
}
}
static srcentry_t *create_srcentry(u_int32 source)
{
srcentry_t *node;
srcentry_t *prev;
if (search_srclist(source, &prev) == TRUE)
return prev;
node = calloc(1, sizeof(srcentry_t));
if (!node) {
logit(LOG_WARNING, 0, "Memory allocation error for srcentry %s",
inet_fmt(source, s1, sizeof(s1)));
return NULL;
}
node->address = source;
/* Free the memory if there is error getting the iif and
* the next hop (upstream) router. */
if (set_incoming(node, PIM_IIF_SOURCE) == FALSE) {
free(node);
return NULL;
}
RESET_TIMER(node->timer);
node->mrtlink = NULL;
node->cand_rp = NULL;
node->next = prev->next;
prev->next = node;
node->prev = prev;
if (node->next)
node->next->prev = node;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "create source entry, source %s",
inet_fmt(source, s1, sizeof(s1)));
}
return node;
}
/*
* Process an incoming neighbor probe message.
*/
void
accept_probe(u_int32_t src, u_int32_t dst, char *p, int datalen,
u_int32_t level)
{
vifi_t vifi;
if ((vifi = find_vif(src, dst)) == NO_VIF) {
logit(LOG_INFO, 0,
"ignoring probe from non-neighbor %s", inet_fmt(src, s1));
return;
}
update_neighbor(vifi, src, DVMRP_PROBE, p, datalen, level);
}
void pim_hello_output(void *arg)
{//给定Holdtime，发送一条PIM的Hello报文
struct pim_hello_output_data *hello_data;//参考实验指导书
struct pim_hello_header *option;
char *mydata;
short *hold_time;
int length;
hello_data=(struct pim_hello_output_data *)arg;
mydata=(char *)(pim_send_buf+sizeof(struct ip)+sizeof(struct pim));
option=(struct pim_hello_header *)mydata;
option->option_type=htons(1);
option->option_length=htons(2);
mydata=mydata+sizeof(struct pim_hello_header);
hold_time=(short *)mydata;
*hold_time=htons(hello_data->holdtime);
length=sizeof(struct pim_hello_header)+sizeof(short);
if(hello_data->regular==1)
{
timer_setTimer(PIM_HELLO_PERIOD,pim_hello_output,hello_data);
}
if(pimdm_output(pim_send_buf,myvifs[hello_data->vif].address,allpimrouters,PIM_HELLO,length)!=1)
{
log(LOG_INFO,"Send Pim Hello Packet On %s(%s) Error!",myvifs[hello_data->vif].name,inet_fmt(myvifs[hello_data->vif].address,s1));
}
else
{
log(LOG_INFO,"Send Pim Hello Packet On %s(%s) Success!",myvifs[hello_data->vif].name,inet_fmt(myvifs[hello_data->vif].address,s1));
}
return;
}
/*
* TODO: when cache miss, check the iif, because probably ASSERTS
* shoult take place
*/
static void process_cache_miss(struct igmpmsg *igmpctl)
{
u_int32 source, mfc_source;
u_int32 group;
u_int32 rp_addr;
vifi_t iif;
mrtentry_t *mrtentry_ptr;
mrtentry_t *mrtentry_rp;
/*
* When there is a cache miss, we check only the header of the packet
* (and only it should be sent up by the kernel.
*/
group = igmpctl->im_dst.s_addr;
source = mfc_source = igmpctl->im_src.s_addr;
iif = igmpctl->im_vif;
IF_DEBUG(DEBUG_MFC)
logit(LOG_DEBUG, 0, "Cache miss, src %s, dst %s, iif %d",
inet_fmt(source, s1, sizeof(s1)), inet_fmt(group, s2, sizeof(s2)), iif);
/* TODO: XXX: check whether the kernel generates cache miss for the
* LAN scoped addresses
*/
if (ntohl(group) <= INADDR_MAX_LOCAL_GROUP)
return; /* Don't create routing entries for the LAN scoped addresses */
/* TODO: check if correct in case the source is one of my addresses */
/* If I am the DR for this source, create (S,G) and add the register_vif
* to the oifs.
*/
if ((uvifs[iif].uv_flags & VIFF_DR)
&& (find_vif_direct_local(source) == iif)) {
mrtentry_ptr = find_route(source, group, MRTF_SG, CREATE);
if (mrtentry_ptr == (mrtentry_t *)NULL)
return;
mrtentry_ptr->flags &= ~MRTF_NEW;
/* set reg_vif_num as outgoing interface ONLY if I am not the RP */
if (mrtentry_ptr->group->rpaddr != my_cand_rp_address)
VIFM_SET(reg_vif_num, mrtentry_ptr->joined_oifs);
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
mrtentry_ptr->joined_oifs,
mrtentry_ptr->pruned_oifs,
mrtentry_ptr->leaves,
mrtentry_ptr->asserted_oifs, 0);
}
else {
mrtentry_ptr = find_route(source, group,
MRTF_SG | MRTF_WC | MRTF_PMBR,
DONT_CREATE);
if (mrtentry_ptr == (mrtentry_t *)NULL)
return;
}
/* TODO: if there are too many cache miss for the same (S,G), install
* negative cache entry in the kernel (oif==NULL) to prevent too
* many upcalls.
*/
if (mrtentry_ptr->incoming == iif) {
if (!VIFM_ISEMPTY(mrtentry_ptr->oifs)) {
if (mrtentry_ptr->flags & MRTF_SG) {
/* TODO: check that the RPbit is not set? */
/* TODO: XXX: TIMER implem. dependency! */
if (mrtentry_ptr->timer < PIM_DATA_TIMEOUT)
SET_TIMER(mrtentry_ptr->timer, PIM_DATA_TIMEOUT);
if (!(mrtentry_ptr->flags & MRTF_SPT)) {
if ((mrtentry_rp = mrtentry_ptr->group->grp_route) ==
(mrtentry_t *)NULL)
mrtentry_rp = mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrtentry_rp != (mrtentry_t *)NULL) {
/* Check if the (S,G) iif is different from
* the (*,G) or (*,*,RP) iif
*/
if ((mrtentry_ptr->incoming != mrtentry_rp->incoming)
|| (mrtentry_ptr->upstream != mrtentry_rp->upstream)) {
mrtentry_ptr->flags |= MRTF_SPT;
mrtentry_ptr->flags &= ~MRTF_RP;
}
}
}
}
if (mrtentry_ptr->flags & MRTF_PMBR)
rp_addr = mrtentry_ptr->source->address;
else
rp_addr = mrtentry_ptr->group->rpaddr;
mfc_source = source;
#ifdef KERNEL_MFC_WC_G
if (mrtentry_ptr->flags & (MRTF_WC | MRTF_PMBR))
if (!(mrtentry_ptr->flags & MRTF_MFC_CLONE_SG))
mfc_source = INADDR_ANY_N;
#endif /* KERNEL_MFC_WC_G */
add_kernel_cache(mrtentry_ptr, mfc_source, group, MFC_MOVE_FORCE);
#ifdef SCOPED_ACL
APPLY_SCOPE(group,mrtentry_ptr);
#endif
k_chg_mfc(igmp_socket, mfc_source, group, iif, mrtentry_ptr->oifs,
rp_addr);
/* TODO: XXX: No need for RSRR message, because nothing has
* changed.
*/
}
return; /* iif match */
}
/* The iif doesn't match */
if (mrtentry_ptr->flags & MRTF_SG) {
if (mrtentry_ptr->flags & MRTF_SPT)
/* Arrived on wrong interface */
return;
if ((mrtentry_rp = mrtentry_ptr->group->grp_route) ==
(mrtentry_t *)NULL)
mrtentry_rp =
mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrtentry_rp != (mrtentry_t *)NULL) {
if (mrtentry_rp->incoming == iif) {
/* Forward on (*,G) or (*,*,RP) */
#ifdef KERNEL_MFC_WC_G
if (!(mrtentry_rp->flags & MRTF_MFC_CLONE_SG))
mfc_source = INADDR_ANY_N;
#endif /* KERNEL_MFC_WC_G */
add_kernel_cache(mrtentry_rp, mfc_source, group, 0);
/* marian: not sure if we are going to reach here for our scoped traffic */
#ifdef SCOPED_ACL
APPLY_SCOPE(group,mrtentry_ptr);
#endif
k_chg_mfc(igmp_socket, mfc_source, group, iif,
mrtentry_rp->oifs, mrtentry_ptr->group->rpaddr);
#ifdef RSRR
rsrr_cache_send(mrtentry_rp, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
}
}
return;
}
}
static mrtentry_t *create_mrtentry(srcentry_t *src, grpentry_t *grp, u_int16 flags)
{
mrtentry_t *node;
mrtentry_t *grp_insert, *src_insert; /* pointers to insert */
u_int32 source;
u_int32 group;
if (flags & MRTF_SG) {
/* (S,G) entry */
source = src->address;
group = grp->group;
if (search_grpmrtlink(grp, source, &grp_insert) == TRUE)
return grp_insert;
if (search_srcmrtlink(src, group, &src_insert) == TRUE) {
/* Hmmm, search_grpmrtlink() didn't find the entry, but
* search_srcmrtlink() did find it! Shouldn't happen. Panic! */
logit(LOG_ERR, 0, "MRT inconsistency for src %s and grp %s\n",
inet_fmt(source, s1, sizeof(s1)), inet_fmt(group, s2, sizeof(s2)));
/* not reached but to make lint happy */
return NULL;
}
/* Create and insert in group mrtlink and source mrtlink chains. */
node = alloc_mrtentry(src, grp);
if (!node)
return NULL;
/* node has to be insert right after grp_insert in the grp
* mrtlink chain and right after src_insert in the src mrtlink
* chain */
insert_grpmrtlink(node, grp_insert, grp);
insert_srcmrtlink(node, src_insert, src);
node->flags |= MRTF_SG;
return node;
}
if (flags & MRTF_WC) {
/* (*,G) entry */
if (grp->grp_route)
return grp->grp_route;
node = alloc_mrtentry(src, grp);
if (!node)
return NULL;
grp->grp_route = node;
node->flags |= (MRTF_WC | MRTF_RP);
return node;
}
if (flags & MRTF_PMBR) {
/* (*,*,RP) entry */
if (src->mrtlink)
return src->mrtlink;
node = alloc_mrtentry(src, grp);
if (!node)
return NULL;
src->mrtlink = node;
node->flags |= (MRTF_PMBR | MRTF_RP);
return node;
}
return NULL;
}
/*
* Process an incoming route report message.
*/
void
accept_report(u_int32_t src, u_int32_t dst, char *p, int datalen,
u_int32_t level)
{
vifi_t vifi;
register int width, i, nrt = 0;
int metric;
u_int32_t mask;
u_int32_t origin;
struct newrt rt[4096];
if ((vifi = find_vif(src, dst)) == NO_VIF) {
logit(LOG_INFO, 0,
"ignoring route report from non-neighbor %s", inet_fmt(src, s1));
return;
}
if (!update_neighbor(vifi, src, DVMRP_REPORT, NULL, 0, level))
return;
if (datalen > 2*4096) {
logit(LOG_INFO, 0,
"ignoring oversize (%d bytes) route report from %s",
datalen, inet_fmt(src, s1));
return;
}
while (datalen > 0) { /* Loop through per-mask lists. */
if (datalen < 3) {
logit(LOG_WARNING, 0,
"received truncated route report from %s",
inet_fmt(src, s1));
return;
}
((u_char *)&mask)[0] = 0xff;
width = 1;
if ((((u_char *)&mask)[1] = *p++) != 0) width = 2;
if ((((u_char *)&mask)[2] = *p++) != 0) width = 3;
if ((((u_char *)&mask)[3] = *p++) != 0) width = 4;
if (!inet_valid_mask(ntohl(mask))) {
logit(LOG_WARNING, 0,
"%s reports bogus netmask 0x%08x (%s)",
inet_fmt(src, s1), ntohl(mask), inet_fmt(mask, s2));
return;
}
datalen -= 3;
do { /* Loop through (origin, metric) pairs */
if (datalen < width + 1) {
logit(LOG_WARNING, 0,
"received truncated route report from %s",
inet_fmt(src, s1));
return;
}
origin = 0;
for (i = 0; i < width; ++i)
((char *)&origin)[i] = *p++;
metric = *p++;
datalen -= width + 1;
rt[nrt].mask = mask;
rt[nrt].origin = origin;
rt[nrt].metric = (metric & 0x7f);
++nrt;
} while (!(metric & 0x80));
}
qsort((char*)rt, nrt, sizeof(rt[0]), compare_rts);
start_route_updates();
/*
* If the last entry is default, change mask from 0xff000000 to 0
*/
if (rt[nrt-1].origin == 0)
rt[nrt-1].mask = 0;
logit(LOG_DEBUG, 0, "Updating %d routes from %s to %s", nrt,
inet_fmt(src, s1), inet_fmt(dst, s2));
for (i = 0; i < nrt; ++i) {
if (i != 0 && rt[i].origin == rt[i-1].origin &&
rt[i].mask == rt[i-1].mask) {
logit(LOG_WARNING, 0, "%s reports duplicate route for %s",
inet_fmt(src, s1), inet_fmts(rt[i].origin, rt[i].mask, s2));
continue;
}
update_route(rt[i].origin, rt[i].mask, rt[i].metric,
src, vifi);
}
if (routes_changed && !delay_change_reports)
report_to_all_neighbors(CHANGED_ROUTES);
}
/*
* Process a route report for a single origin, creating or updating the
* corresponding routing table entry if necessary. 'src' is either the
* address of a neighboring router from which the report arrived, or zero
* to indicate a change of status of one of our own interfaces.
*/
void
update_route(u_int32_t origin, u_int32_t mask, u_int metric, u_int32_t src,
vifi_t vifi)
{
register struct rtentry *r;
u_int adj_metric;
/*
* Compute an adjusted metric, taking into account the cost of the
* subnet or tunnel over which the report arrived, and normalizing
* all unreachable/poisoned metrics into a single value.
*/
if (src != 0 && (metric < 1 || metric >= 2*UNREACHABLE)) {
logit(LOG_WARNING, 0,
"%s reports out-of-range metric %u for origin %s",
inet_fmt(src, s1), metric, inet_fmts(origin, mask, s2));
return;
}
adj_metric = metric + uvifs[vifi].uv_metric;
if (adj_metric > UNREACHABLE) adj_metric = UNREACHABLE;
/*
* Look up the reported origin in the routing table.
*/
if (!find_route(origin, mask)) {
/*
* Not found.
* Don't create a new entry if the report says it's unreachable,
* or if the reported origin and mask are invalid.
*/
if (adj_metric == UNREACHABLE) {
return;
}
if (src != 0 && !inet_valid_subnet(origin, mask)) {
logit(LOG_WARNING, 0,
"%s reports an invalid origin (%s) and/or mask (%08x)",
inet_fmt(src, s1), inet_fmt(origin, s2), ntohl(mask));
return;
}
/*
* OK, create the new routing entry. 'rtp' will be left pointing
* to the new entry.
*/
create_route(origin, mask);
/*
* Now "steal away" any sources that belong under this route
* by deleting any cache entries they might have created
* and allowing the kernel to re-request them.
*/
steal_sources(rtp);
rtp->rt_metric = UNREACHABLE; /* temporary; updated below */
}
/*
* We now have a routing entry for the reported origin. Update it?
*/
r = rtp;
if (r->rt_metric == UNREACHABLE) {
/*
* The routing entry is for a formerly-unreachable or new origin.
* If the report claims reachability, update the entry to use
* the reported route.
*/
if (adj_metric == UNREACHABLE)
return;
r->rt_parent = vifi;
init_children_and_leaves(r, vifi);
r->rt_gateway = src;
r->rt_timer = 0;
r->rt_metric = adj_metric;
r->rt_flags |= RTF_CHANGED;
routes_changed = TRUE;
update_table_entry(r);
}
else if (src == r->rt_gateway) {
/*
* The report has come either from the interface directly-connected
* to the origin subnet (src and r->rt_gateway both equal zero) or
* from the gateway we have chosen as the best first-hop gateway back
* towards the origin (src and r->rt_gateway not equal zero). Reset
* the route timer and, if the reported metric has changed, update
* our entry accordingly.
*/
r->rt_timer = 0;
if (adj_metric == r->rt_metric)
return;
if (adj_metric == UNREACHABLE) {
del_table_entry(r, 0, DEL_ALL_ROUTES);
r->rt_timer = ROUTE_EXPIRE_TIME;
}
else if (adj_metric < r->rt_metric) {
if (init_children_and_leaves(r, vifi)) {
update_table_entry(r);
}
}
r->rt_metric = adj_metric;
r->rt_flags |= RTF_CHANGED;
routes_changed = TRUE;
}
else if (src == 0 ||
(r->rt_gateway != 0 &&
(adj_metric < r->rt_metric ||
(adj_metric == r->rt_metric &&
(ntohl(src) < ntohl(r->rt_gateway) ||
r->rt_timer >= ROUTE_SWITCH_TIME))))) {
/*
* The report is for an origin we consider reachable; the report
* comes either from one of our own interfaces or from a gateway
* other than the one we have chosen as the best first-hop gateway
* back towards the origin. If the source of the update is one of
* our own interfaces, or if the origin is not a directly-connected
* subnet and the reported metric for that origin is better than
* what our routing entry says, update the entry to use the new
* gateway and metric. We also switch gateways if the reported
* metric is the same as the one in the route entry and the gateway
* associated with the route entry has not been heard from recently,
* or if the metric is the same but the reporting gateway has a lower
* IP address than the gateway associated with the route entry.
* Did you get all that?
*/
if (r->rt_parent != vifi || adj_metric < r->rt_metric) {
/*
* XXX Why do we do this if we are just changing the metric?
*/
r->rt_parent = vifi;
if (init_children_and_leaves(r, vifi)) {
update_table_entry(r);
}
}
r->rt_gateway = src;
r->rt_timer = 0;
r->rt_metric = adj_metric;
r->rt_flags |= RTF_CHANGED;
routes_changed = TRUE;
}
else if (vifi != r->rt_parent) {
/*
* The report came from a vif other than the route's parent vif.
* Update the children and leaf info, if necessary.
*/
if (VIFM_ISSET(vifi, r->rt_children)) {
/*
* Vif is a child vif for this route.
*/
if (metric < r->rt_metric ||
(metric == r->rt_metric &&
ntohl(src) < ntohl(uvifs[vifi].uv_lcl_addr))) {
/*
* Neighbor has lower metric to origin (or has same metric
* and lower IP address) -- it becomes the dominant router,
* and vif is no longer a child for me.
*/
VIFM_CLR(vifi, r->rt_children);
VIFM_CLR(vifi, r->rt_leaves);
r->rt_dominants [vifi] = src;
r->rt_subordinates[vifi] = 0;
r->rt_leaf_timers [vifi] = 0;
update_table_entry(r);
}
else if (metric > UNREACHABLE) { /* "poisoned reverse" */
/*
* Neighbor considers this vif to be on path to route's
* origin; if no subordinate recorded, record this neighbor
* as subordinate and clear the leaf flag.
*/
if (r->rt_subordinates[vifi] == 0) {
VIFM_CLR(vifi, r->rt_leaves);
r->rt_subordinates[vifi] = src;
r->rt_leaf_timers [vifi] = 0;
update_table_entry(r);
}
}
else if (src == r->rt_subordinates[vifi]) {
/*
* Current subordinate no longer considers this vif to be on
* path to route's origin; it is no longer a subordinate
* router, and we set the leaf confirmation timer to give
* us time to hear from other subordinates.
*/
r->rt_subordinates[vifi] = 0;
if (uvifs[vifi].uv_neighbors == NULL ||
uvifs[vifi].uv_neighbors->al_next == NULL) {
VIFM_SET(vifi, r->rt_leaves);
update_table_entry(r);
}
else {
r->rt_leaf_timers [vifi] = LEAF_CONFIRMATION_TIME;
r->rt_flags |= RTF_LEAF_TIMING;
}
}
}
else if (src == r->rt_dominants[vifi] &&
(metric > r->rt_metric ||
(metric == r->rt_metric &&
ntohl(src) > ntohl(uvifs[vifi].uv_lcl_addr)))) {
/*
* Current dominant no longer has a lower metric to origin
* (or same metric and lower IP address); we adopt the vif
* as our own child.
*/
VIFM_SET(vifi, r->rt_children);
r->rt_dominants [vifi] = 0;
if (metric > UNREACHABLE) {
r->rt_subordinates[vifi] = src;
}
else if (uvifs[vifi].uv_neighbors == NULL ||
uvifs[vifi].uv_neighbors->al_next == NULL) {
VIFM_SET(vifi, r->rt_leaves);
}
else {
r->rt_leaf_timers[vifi] = LEAF_CONFIRMATION_TIME;
r->rt_flags |= RTF_LEAF_TIMING;
}
update_table_entry(r);
}
}
}
/*
* Set the iif, upstream router, preference and metric for the route
* toward the source. Return TRUE is the route was found, othewise FALSE.
* If srctype==PIM_IIF_SOURCE and if the source is directly connected
* then the "upstream" is set to NULL. If srcentry==PIM_IIF_RP, then
* "upstream" in case of directly connected "source" will be that "source"
* (if it is also PIM router).,
*/
int set_incoming(srcentry_t *srcentry_ptr, int srctype)
{
struct rpfctl rpfc;
u_int32 source = srcentry_ptr->address;
u_int32 neighbor_addr;
struct uvif *v;
pim_nbr_entry_t *n;
/* Preference will be 0 if directly connected */
srcentry_ptr->metric = 0;
srcentry_ptr->preference = 0;
if ((srcentry_ptr->incoming = local_address(source)) != NO_VIF) {
/* The source is a local address */
/* TODO: set the upstream to myself? */
srcentry_ptr->upstream = (pim_nbr_entry_t *)NULL;
return (TRUE);
}
if ((srcentry_ptr->incoming = find_vif_direct(source)) != NO_VIF) {
/* The source is directly connected. Check whether we are
* looking for real source or RP
*/
if (srctype == PIM_IIF_SOURCE) {
srcentry_ptr->upstream = (pim_nbr_entry_t *)NULL;
return (TRUE);
} else {
/* PIM_IIF_RP */
neighbor_addr = source;
}
} else {
/* TODO: probably need to check the case if the iif is disabled */
/* Use the lastest resource: the kernel unicast routing table */
k_req_incoming(source, &rpfc);
if ((rpfc.iif == NO_VIF) ||
rpfc.rpfneighbor.s_addr == INADDR_ANY_N) {
/* couldn't find a route */
IF_DEBUG(DEBUG_PIM_MRT | DEBUG_RPF)
logit(LOG_DEBUG, 0, "NO ROUTE found for %s",
inet_fmt(source, s1, sizeof(s1)));
return FALSE;
}
srcentry_ptr->incoming = rpfc.iif;
neighbor_addr = rpfc.rpfneighbor.s_addr;
/* set the preference for sources that aren't directly connected. */
v = &uvifs[srcentry_ptr->incoming];
srcentry_ptr->preference = v->uv_local_pref;
srcentry_ptr->metric = v->uv_local_metric;
}
/*
* The upstream router must be a (PIM router) neighbor, otherwise we
* are in big trouble ;-)
*/
v = &uvifs[srcentry_ptr->incoming];
for (n = v->uv_pim_neighbors; n != NULL; n = n->next) {
if (ntohl(neighbor_addr) < ntohl(n->address))
continue;
if (neighbor_addr == n->address) {
/*
*The upstream router is found in the list of neighbors.
* We are safe!
*/
srcentry_ptr->upstream = n;
IF_DEBUG(DEBUG_RPF)
logit(LOG_DEBUG, 0,
"For src %s, iif is %d, next hop router is %s",
inet_fmt(source, s1, sizeof(s1)), srcentry_ptr->incoming,
inet_fmt(neighbor_addr, s2, sizeof(s2)));
return TRUE;
}
else break;
}
/* TODO: control the number of messages! */
logit(LOG_INFO, 0,
"For src %s, iif is %d, next hop router is %s: NOT A PIM ROUTER",
inet_fmt(source, s1, sizeof(s1)), srcentry_ptr->incoming,
inet_fmt(neighbor_addr, s2, sizeof(s2)));
srcentry_ptr->upstream = (pim_nbr_entry_t *)NULL;
return FALSE;
}
/*
* TODO: XXX: currently `source` is not used. Will be used with IGMPv3 where
* we have source-specific Join/Prune.
*/
void add_leaf(vifi_t vifi, u_int32 source __attribute__((unused)), u_int32 group)
{
mrtentry_t *mrtentry_ptr;
mrtentry_t *mrtentry_srcs;
vifbitmap_t old_oifs;
vifbitmap_t new_oifs;
vifbitmap_t new_leaves;
if (ntohl(group) <= INADDR_MAX_LOCAL_GROUP)
return; /* Don't create routing entries for the LAN scoped addresses */
/*
* XXX: only if I am a DR, the IGMP Join should result in creating
* a PIM MRT state.
* XXX: Each router must know if it has local members, i.e., whether
* it is a last-hop router as well. This info is needed so it will
* know whether is allowed to initiate a SPT switch by sending
* a PIM (S,G) Join to the high datarate source.
* However, if a non-DR last-hop router has not received
* a PIM Join, it should not create a PIM state, otherwise later
* this state may incorrectly trigger PIM joins.
* There is a design flow in pimd, so without making major changes
* the best we can do is that the non-DR last-hop router will
* record the local members only after it receives PIM Join from the DR
* (i.e. after the second or third IGMP Join by the local member).
* The downside is that a last-hop router may delay the initiation
* of the SPT switch. Sigh...
*/
if (uvifs[vifi].uv_flags & VIFF_DR)
mrtentry_ptr = find_route(INADDR_ANY_N, group, MRTF_WC, CREATE);
else
mrtentry_ptr = find_route(INADDR_ANY_N, group, MRTF_WC, DONT_CREATE);
if (mrtentry_ptr == (mrtentry_t *)NULL)
return;
IF_DEBUG(DEBUG_MRT)
logit(LOG_DEBUG, 0, "Adding vif %d for group %s", vifi,
inet_fmt(group, s1, sizeof(s1)));
if (VIFM_ISSET(vifi, mrtentry_ptr->leaves))
return; /* Already a leaf */
calc_oifs(mrtentry_ptr, &old_oifs);
VIFM_COPY(mrtentry_ptr->leaves, new_leaves);
VIFM_SET(vifi, new_leaves); /* Add the leaf */
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
mrtentry_ptr->joined_oifs,
mrtentry_ptr->pruned_oifs,
new_leaves,
mrtentry_ptr->asserted_oifs, 0);
calc_oifs(mrtentry_ptr, &new_oifs);
/* Only if I am the DR for that subnet, eventually initiate a Join */
if (!(uvifs[vifi].uv_flags & VIFF_DR))
return;
if ((mrtentry_ptr->flags & MRTF_NEW)
|| (VIFM_ISEMPTY(old_oifs) && (!VIFM_ISEMPTY(new_oifs)))) {
/* A new created entry or the oifs have changed
* from NULL to non-NULL.
*/
mrtentry_ptr->flags &= ~MRTF_NEW;
FIRE_TIMER(mrtentry_ptr->jp_timer); /* Timeout the Join/Prune timer */
/* TODO: explicitly call the function below?
send_pim_join_prune(mrtentry_ptr->upstream->vifi,
mrtentry_ptr->upstream,
PIM_JOIN_PRUNE_HOLDTIME);
*/
}
/* Check all (S,G) entries and set the inherited "leaf" flag.
* TODO: XXX: This won't work for IGMPv3, because there we don't know
* whether the (S,G) leaf oif was inherited from the (*,G) entry or
* was created by source specific IGMP join.
*/
for (mrtentry_srcs = mrtentry_ptr->group->mrtlink;
mrtentry_srcs != (mrtentry_t *)NULL;
mrtentry_srcs = mrtentry_srcs->grpnext) {
VIFM_COPY(mrtentry_srcs->leaves, new_leaves);
VIFM_SET(vifi, new_leaves);
change_interfaces(mrtentry_srcs,
mrtentry_srcs->incoming,
mrtentry_srcs->joined_oifs,
mrtentry_srcs->pruned_oifs,
new_leaves,
mrtentry_srcs->asserted_oifs, 0);
}
}
