int igmp_rcv(struct sk_buff *skb, struct device *dev, struct options *opt,
__u32 daddr, unsigned short len, __u32 saddr, int redo,
struct inet_protocol *protocol)
{
/* This basically follows the spec line by line -- see RFC1112 */
struct igmphdr *ih;
/*
* Mrouted needs to able to query local interfaces. So
* report for the device this was sent at. (Which can
* be the loopback this time)
*/
if(dev->flags&IFF_LOOPBACK)
{
dev=ip_dev_find(saddr);
if(dev==NULL)
dev=&loopback_dev;
}
ih=(struct igmphdr *)skb->h.raw;
if(len <sizeof(struct igmphdr) || skb->ip_hdr->ttl<1 || ip_compute_csum((void *)skb->h.raw,sizeof(struct igmphdr)))
{
kfree_skb(skb, FREE_READ);
return 0;
}
/*
* I have a report that someone does this!
*/
if(saddr==0)
{
printk(KERN_INFO "Broken multicast host using 0.0.0.0 heard on %s\n",
dev->name);
kfree_skb(skb, FREE_READ);
return 0;
}
if(ih->type==IGMP_HOST_MEMBERSHIP_QUERY && daddr==IGMP_ALL_HOSTS)
igmp_heard_query(dev,ih->code);
if(ih->type==IGMP_HOST_MEMBERSHIP_REPORT && daddr==ih->group)
igmp_heard_report(dev,ih->group, saddr);
if(ih->type==IGMP_HOST_NEW_MEMBERSHIP_REPORT && daddr==ih->group)
igmp_heard_report(dev,ih->group, saddr);
kfree_skb(skb, FREE_READ);
return 0;
}
int igmp_rcv(struct sk_buff *skb, struct device *dev, struct options *opt,
unsigned long daddr, unsigned short len, unsigned long saddr, int redo,
struct inet_protocol *protocol)
{
/* This basically follows the spec line by line -- see RFC1112 */
struct igmphdr *igh=(struct igmphdr *)skb->h.raw;
if(skb->ip_hdr->ttl!=1 || ip_compute_csum((void *)igh,sizeof(*igh)))
{
kfree_skb(skb, FREE_READ);
return 0;
}
if(igh->type==IGMP_HOST_MEMBERSHIP_QUERY && daddr==IGMP_ALL_HOSTS)
igmp_heard_query(dev);
if(igh->type==IGMP_HOST_MEMBERSHIP_REPORT && daddr==igh->group)
igmp_heard_report(dev,igh->group);
kfree_skb(skb, FREE_READ);
return 0;
}
int igmp_rcv(struct sk_buff *skb, unsigned short len)
{
/* This basically follows the spec line by line -- see RFC1112 */
struct igmphdr *ih = skb->h.igmph;
struct in_device *in_dev = skb->dev->ip_ptr;
if (len < sizeof(struct igmphdr) || ip_compute_csum((void *)ih, len)
|| in_dev==NULL) {
kfree_skb(skb);
return 0;
}
switch (ih->type) {
case IGMP_HOST_MEMBERSHIP_QUERY:
igmp_heard_query(in_dev, ih->code, ih->group);
break;
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMP_HOST_NEW_MEMBERSHIP_REPORT:
/* Is it our report looped back? */
if (((struct rtable*)skb->dst)->key.iif == 0)
break;
igmp_heard_report(in_dev, ih->group);
break;
case IGMP_PIM:
#ifdef CONFIG_IP_PIMSM_V1
return pim_rcv_v1(skb, len);
#endif
case IGMP_DVMRP:
case IGMP_TRACE:
case IGMP_HOST_LEAVE_MESSAGE:
case IGMP_MTRACE:
case IGMP_MTRACE_RESP:
break;
default:
NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type));
}
kfree_skb(skb);
return 0;
}
int igmp_rcv(struct sk_buff *skb)
{
/* This basically follows the spec line by line -- see RFC1112 */
struct igmphdr *ih = skb->h.igmph;
struct in_device *in_dev = in_dev_get(skb->dev);
int len = skb->len;
if (in_dev==NULL) {
kfree_skb(skb);
return 0;
}
if (skb_is_nonlinear(skb)) {
if (skb_linearize(skb, GFP_ATOMIC) != 0) {
kfree_skb(skb);
return -ENOMEM;
}
ih = skb->h.igmph;
}
if (len < sizeof(struct igmphdr) || ip_compute_csum((void *)ih, len)) {
in_dev_put(in_dev);
kfree_skb(skb);
return 0;
}
#ifdef CONFIG_RG_IGMP_PROXY
igmprx_recv(skb);
#endif
#ifdef CONFIG_RG_IGMP_PROXY_MODULE
if (igmp_proxy_recv)
igmp_proxy_recv(skb);
#endif
switch (ih->type) {
case IGMP_HOST_MEMBERSHIP_QUERY:
igmp_heard_query(in_dev, ih->code, ih->group);
break;
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMP_HOST_NEW_MEMBERSHIP_REPORT:
/* Is it our report looped back? */
if (((struct rtable*)skb->dst)->key.iif == 0)
break;
igmp_heard_report(in_dev, ih->group);
break;
case IGMP_PIM:
#ifdef CONFIG_IP_PIMSM_V1
in_dev_put(in_dev);
return pim_rcv_v1(skb);
#endif
case IGMP_DVMRP:
case IGMP_TRACE:
case IGMP_HOST_LEAVE_MESSAGE:
case IGMP_MTRACE:
case IGMP_MTRACE_RESP:
break;
default:
// NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type));
;
}
in_dev_put(in_dev);
kfree_skb(skb);
return 0;
}