static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
{
unsigned long delay = resptime;
MDBG3((KERN_DEBUG
"igmp6_group_queried(ma=%p, resptime=%lu)\n",
ma, resptime));
/* Do not start timer for addresses with reserved/host scope */
if (IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL ||
ipv6_addr_is_ll_all_nodes(&ma->mca_addr))
return;
spin_lock(&ma->mca_lock);
if (del_timer(&ma->mca_timer)) {
atomic_dec(&ma->mca_refcnt);
delay = ma->mca_timer.expires - jiffies;
}
if (delay >= resptime) {
if (resptime) {
get_random_bytes(&delay, sizeof(delay));
delay %= resptime;
} else
delay = 1;
}
ma->mca_timer.expires = jiffies + delay;
if (!mod_timer(&ma->mca_timer, jiffies + delay))
atomic_inc(&ma->mca_refcnt);
spin_unlock(&ma->mca_lock);
}
static void igmp6_join_group(struct ifmcaddr6 *ma)
{
unsigned long delay;
#ifdef CONFIG_IPV6_MLD6_DEBUG
char abuf[128];
in6_ntop(&ma->mca_addr, abuf);
MDBG3((KERN_DEBUG
"igmp6_join_group(ma=%p): mca_addr=%s\n",
ma, abuf));
#endif
if (IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL ||
ipv6_addr_is_ll_all_nodes(&ma->mca_addr))
return;
igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
get_random_bytes(&delay, sizeof(delay));
delay %= IGMP6_UNSOLICITED_IVAL;
spin_lock_bh(&ma->mca_lock);
if (del_timer(&ma->mca_timer)) {
atomic_dec(&ma->mca_refcnt);
delay = ma->mca_timer.expires - jiffies;
}
if (!mod_timer(&ma->mca_timer, jiffies + delay))
atomic_inc(&ma->mca_refcnt);
ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
spin_unlock_bh(&ma->mca_lock);
}
static int ipv6_mc_check_mld_query(struct sk_buff *skb)
{
unsigned int transport_len = ipv6_transport_len(skb);
struct mld_msg *mld;
unsigned int len;
/* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
return -EINVAL;
/* MLDv1? */
if (transport_len != sizeof(struct mld_msg)) {
/* or MLDv2? */
if (transport_len < sizeof(struct mld2_query))
return -EINVAL;
len = skb_transport_offset(skb) + sizeof(struct mld2_query);
if (!ipv6_mc_may_pull(skb, len))
return -EINVAL;
}
mld = (struct mld_msg *)skb_transport_header(skb);
/* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
* all-nodes destination address (ff02::1) for general queries
*/
if (ipv6_addr_any(&mld->mld_mca) &&
!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
return -EINVAL;
return 0;
}
static void igmp6_leave_group(struct ifmcaddr6 *ma)
{
#ifdef CONFIG_IPV6_MLD6_DEBUG
char abuf[128];
in6_ntop(&ma->mca_addr, abuf);
MDBG3((KERN_DEBUG
"igmp6_leave_group(ma=%p): mca_addr=%s\n",
ma, abuf));
#endif
if (IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL ||
ipv6_addr_is_ll_all_nodes(&ma->mca_addr))
return;
if (ma->mca_flags & MAF_LAST_REPORTER)
igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REDUCTION);
spin_lock_bh(&ma->mca_lock);
if (del_timer(&ma->mca_timer))
atomic_dec(&ma->mca_refcnt);
spin_unlock_bh(&ma->mca_lock);
}
