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multicast: Extend ip address command to enable multicast group join/leave on

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Joining multicast group on ethernet level via "ip maddr" command would
not work if we have an Ethernet switch that does igmp snooping since
the switch would not replicate multicast packets on ports that did not
have IGMP reports for the multicast addresses.

Linux vxlan interfaces created via "ip link add vxlan" have the group option
that enables then to do the required join.

By extending ip address command with option "autojoin" we can get similar
functionality for openvswitch vxlan interfaces as well as other tunneling
mechanisms that need to receive multicast traffic. The kernel code is
structured similar to how the vxlan driver does a group join / leave.

example:
ip address add 224.1.1.10/24 dev eth5 autojoin
ip address del 224.1.1.10/24 dev eth5

Signed-off-by: Madhu Challa <challa@noironetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Madhu Challa
2015-02-25 09:58:35 -08:00
committed by David S. Miller
parent 46a4dee074
commit 93a714d6b5
7 changed files with 98 additions and 7 deletions
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13
net/ipv4/igmp.c
View File

@@ -97,6 +97,7 @@
#include <net/route.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <net/inet_common.h>
#include <linux/netfilter_ipv4.h>
#ifdef CONFIG_IP_MROUTE
#include <linux/mroute.h>
@@ -2740,6 +2741,7 @@ static const struct file_operations igmp_mcf_seq_fops = {
static int __net_init igmp_net_init(struct net *net)
{
struct proc_dir_entry *pde;
int err;
pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
if (!pde)
@@ -2748,8 +2750,18 @@ static int __net_init igmp_net_init(struct net *net)
&igmp_mcf_seq_fops);
if (!pde)
goto out_mcfilter;
err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
SOCK_DGRAM, 0, net);
if (err < 0) {
pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
err);
goto out_sock;
}
return 0;
out_sock:
remove_proc_entry("mcfilter", net->proc_net);
out_mcfilter:
remove_proc_entry("igmp", net->proc_net);
out_igmp:
@@ -2760,6 +2772,7 @@ static void __net_exit igmp_net_exit(struct net *net)
{
remove_proc_entry("mcfilter", net->proc_net);
remove_proc_entry("igmp", net->proc_net);
inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
}
static struct pernet_operations igmp_net_ops = {