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Diffstat (limited to 'net/ipv4/igmp.c')
-rw-r--r--net/ipv4/igmp.c79
1 files changed, 71 insertions, 8 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index d8c232794bcb..cd71190d2962 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -363,7 +363,7 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
static int igmpv3_sendpack(struct sk_buff *skb)
{
struct igmphdr *pig = igmp_hdr(skb);
- const int igmplen = skb->tail - skb->transport_header;
+ const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
@@ -1217,6 +1217,57 @@ static void igmp_group_added(struct ip_mc_list *im)
* Multicast list managers
*/
+static u32 ip_mc_hash(const struct ip_mc_list *im)
+{
+ return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
+}
+
+static void ip_mc_hash_add(struct in_device *in_dev,
+ struct ip_mc_list *im)
+{
+ struct ip_mc_list __rcu **mc_hash;
+ u32 hash;
+
+ mc_hash = rtnl_dereference(in_dev->mc_hash);
+ if (mc_hash) {
+ hash = ip_mc_hash(im);
+ im->next_hash = mc_hash[hash];
+ rcu_assign_pointer(mc_hash[hash], im);
+ return;
+ }
+
+ /* do not use a hash table for small number of items */
+ if (in_dev->mc_count < 4)
+ return;
+
+ mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
+ GFP_KERNEL);
+ if (!mc_hash)
+ return;
+
+ for_each_pmc_rtnl(in_dev, im) {
+ hash = ip_mc_hash(im);
+ im->next_hash = mc_hash[hash];
+ RCU_INIT_POINTER(mc_hash[hash], im);
+ }
+
+ rcu_assign_pointer(in_dev->mc_hash, mc_hash);
+}
+
+static void ip_mc_hash_remove(struct in_device *in_dev,
+ struct ip_mc_list *im)
+{
+ struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
+ struct ip_mc_list *aux;
+
+ if (!mc_hash)
+ return;
+ mc_hash += ip_mc_hash(im);
+ while ((aux = rtnl_dereference(*mc_hash)) != im)
+ mc_hash = &aux->next_hash;
+ *mc_hash = im->next_hash;
+}
+
/*
* A socket has joined a multicast group on device dev.
@@ -1258,6 +1309,8 @@ void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
in_dev->mc_count++;
rcu_assign_pointer(in_dev->mc_list, im);
+ ip_mc_hash_add(in_dev, im);
+
#ifdef CONFIG_IP_MULTICAST
igmpv3_del_delrec(in_dev, im->multiaddr);
#endif
@@ -1314,6 +1367,7 @@ void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
ip = &i->next_rcu) {
if (i->multiaddr == addr) {
if (--i->users == 0) {
+ ip_mc_hash_remove(in_dev, i);
*ip = i->next_rcu;
in_dev->mc_count--;
igmp_group_dropped(i);
@@ -1381,13 +1435,9 @@ void ip_mc_init_dev(struct in_device *in_dev)
{
ASSERT_RTNL();
- in_dev->mc_tomb = NULL;
#ifdef CONFIG_IP_MULTICAST
- in_dev->mr_gq_running = 0;
setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
(unsigned long)in_dev);
- in_dev->mr_ifc_count = 0;
- in_dev->mc_count = 0;
setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
(unsigned long)in_dev);
in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
@@ -2321,12 +2371,25 @@ void ip_mc_drop_socket(struct sock *sk)
int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
{
struct ip_mc_list *im;
+ struct ip_mc_list __rcu **mc_hash;
struct ip_sf_list *psf;
int rv = 0;
- for_each_pmc_rcu(in_dev, im) {
- if (im->multiaddr == mc_addr)
- break;
+ mc_hash = rcu_dereference(in_dev->mc_hash);
+ if (mc_hash) {
+ u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
+
+ for (im = rcu_dereference(mc_hash[hash]);
+ im != NULL;
+ im = rcu_dereference(im->next_hash)) {
+ if (im->multiaddr == mc_addr)
+ break;
+ }
+ } else {
+ for_each_pmc_rcu(in_dev, im) {
+ if (im->multiaddr == mc_addr)
+ break;
+ }
}
if (im && proto == IPPROTO_IGMP) {
rv = 1;