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bridge: Snoop Multicast Router Advertisements

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When multiple multicast routers are present in a broadcast domain then
only one of them will be detectable via IGMP/MLD query snooping. The
multicast router with the lowest IP address will become the selected and
active querier while all other multicast routers will then refrain from
sending queries.

To detect such rather silent multicast routers, too, RFC4286
("Multicast Router Discovery") provides a standardized protocol to
detect multicast routers for multicast snooping switches.

This patch implements the necessary MRD Advertisement message parsing
and after successful processing adds such routers to the internal
multicast router list.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Linus Lüssing
2019-01-21 07:26:28 +01:00
committed by David S. Miller
parent 4effd28c12
commit 4b3087c7e3
6 changed files with 82 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
net/bridge/br_multicast.c
View File

@@ -14,6 +14,7 @@
#include <linux/export.h>
#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/in.h>
#include <linux/jhash.h>
#include <linux/kernel.h>
#include <linux/log2.h>
@@ -29,10 +30,12 @@
#include <net/ip.h>
#include <net/switchdev.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/icmpv6.h>
#include <net/ipv6.h>
#include <net/mld.h>
#include <net/ip6_checksum.h>
#include <net/addrconf.h>
#include <net/ipv6.h>
#endif
#include "br_private.h"
@@ -1583,6 +1586,19 @@ static void br_multicast_pim(struct net_bridge *br,
br_multicast_mark_router(br, port);
}
static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb)
{
if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
return -ENOMSG;
br_multicast_mark_router(br, port);
return 0;
}
static int br_multicast_ipv4_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb,
@@ -1600,7 +1616,15 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
} else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
if (ip_hdr(skb)->protocol == IPPROTO_PIM)
br_multicast_pim(br, port, skb);
} else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
err = br_ip4_multicast_mrd_rcv(br, port, skb);
if (err < 0 && err != -ENOMSG) {
br_multicast_err_count(br, port, skb->protocol);
return err;
}
}
return 0;
} else if (err < 0) {
br_multicast_err_count(br, port, skb->protocol);
@@ -1635,6 +1659,27 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
}
#if IS_ENABLED(CONFIG_IPV6)
static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb)
{
int ret;
if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
return -ENOMSG;
ret = ipv6_mc_check_icmpv6(skb);
if (ret < 0)
return ret;
if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
return -ENOMSG;
br_multicast_mark_router(br, port);
return 0;
}
static int br_multicast_ipv6_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb,
@@ -1649,6 +1694,16 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
if (err == -ENOMSG) {
if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
err = br_ip6_multicast_mrd_rcv(br, port, skb);
if (err < 0 && err != -ENOMSG) {
br_multicast_err_count(br, port, skb->protocol);
return err;
}
}
return 0;
} else if (err < 0) {
br_multicast_err_count(br, port, skb->protocol);