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authorLinus Lüssing <linus.luessing@c0d3.blue>2019-01-21 07:26:28 +0100
committerDavid S. Miller <davem@davemloft.net>2019-01-22 17:18:09 -0800
commit4b3087c7e37f9e499127201849e33960dc81da11 (patch)
tree01fb05eabe24132c0fa596c8cf7a536fffda134d /net/bridge
parent4effd28c1245303dce7fd290c501ac2c11052114 (diff)
downloadlinux-4b3087c7e37f9e499127201849e33960dc81da11.tar.bz2
bridge: Snoop Multicast Router Advertisements
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>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_multicast.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 2366f4a2780e..2c46c7aca571 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -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);