diff options
| author | Nikolay Aleksandrov <nikolay@cumulusnetworks.com> | 2016-10-31 13:21:05 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-31 16:18:30 -0400 |
| commit | 91b02d3d133bbb101466325cdd9a6007cd9ec5a8 (patch) | |
| tree | 05987ec9f8f4c7bfcb2b29c59d89d6a4096fb86b | |
| parent | 56245cae19f5ccb371fa63b09bb6b9ce7c0f1266 (diff) | |
bridge: mcast: add router port on PIM hello message
When we receive a PIM Hello message on a port we can consider that it
has a multicast router attached, thus it is correct to add it to the
router list. The only catch is it shouldn't be considered for a querier.
Using Daniel's description:
leaf-11 leaf-12 leaf-13
\ | /
bridge-1
/ \
host-11 host-12
- all ports in bridge-1 are in a single vlan aware bridge
- leaf-11 is the IGMP querier
- leaf-13 is the PIM DR
- host-11 TXes packets to 226.10.10.10
- bridge-1 only forwards the 226.10.10.10 traffic out the port to
leaf-11, it should also forward this traffic out the port to leaf-13
Suggested-by: Daniel Walton <dwalton@cumulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/bridge/br_multicast.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 2136e45f5277..073d54afa056 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -25,6 +25,7 @@ #include <linux/slab.h> #include <linux/timer.h> #include <linux/inetdevice.h> +#include <linux/mroute.h> #include <net/ip.h> #if IS_ENABLED(CONFIG_IPV6) #include <net/ipv6.h> @@ -1638,6 +1639,21 @@ static void br_multicast_err_count(const struct net_bridge *br, u64_stats_update_end(&pstats->syncp); } +static void br_multicast_pim(struct net_bridge *br, + struct net_bridge_port *port, + const struct sk_buff *skb) +{ + unsigned int offset = skb_transport_offset(skb); + struct pimhdr *pimhdr, _pimhdr; + + pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr); + if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION || + pim_hdr_type(pimhdr) != PIM_TYPE_HELLO) + return; + + br_multicast_mark_router(br, port); +} + static int br_multicast_ipv4_rcv(struct net_bridge *br, struct net_bridge_port *port, struct sk_buff *skb, @@ -1650,8 +1666,12 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br, err = ip_mc_check_igmp(skb, &skb_trimmed); if (err == -ENOMSG) { - if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) + if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) { BR_INPUT_SKB_CB(skb)->mrouters_only = 1; + } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) { + if (ip_hdr(skb)->protocol == IPPROTO_PIM) + br_multicast_pim(br, port, skb); + } return 0; } else if (err < 0) { br_multicast_err_count(br, port, skb->protocol); |