From aa2ae3e71c74cc00ec22f133dc900b3817415785 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Mon, 21 Nov 2016 13:03:25 +0100 Subject: [PATCH] bridge: mcast: add MLDv2 querier support This patch adds basic support for MLDv2 queries, the default is MLDv1 as before. A new multicast option - multicast_mld_version, adds the ability to change it between 1 and 2 via netlink and sysfs. The MLD option is disabled if CONFIG_IPV6 is disabled. Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- include/uapi/linux/if_link.h | 1 + net/bridge/br_multicast.c | 89 +++++++++++++++++++++++++++--------- net/bridge/br_netlink.c | 19 +++++++- net/bridge/br_private.h | 4 ++ net/bridge/br_sysfs_br.c | 22 +++++++++ 5 files changed, 113 insertions(+), 22 deletions(-) diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 325d2601150d..92b2d4928bf1 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -276,6 +276,7 @@ enum { IFLA_BR_VLAN_STATS_ENABLED, IFLA_BR_MCAST_STATS_ENABLED, IFLA_BR_MCAST_IGMP_VERSION, + IFLA_BR_MCAST_MLD_VERSION, __IFLA_BR_MAX, }; diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 66192c11aa45..b30e77e8427c 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -459,15 +459,20 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, const struct in6_addr *grp, u8 *igmp_type) { - struct sk_buff *skb; + struct mld2_query *mld2q; + unsigned long interval; struct ipv6hdr *ip6h; struct mld_msg *mldq; + size_t mld_hdr_size; + struct sk_buff *skb; struct ethhdr *eth; u8 *hopopt; - unsigned long interval; + mld_hdr_size = sizeof(*mldq); + if (br->multicast_mld_version == 2) + mld_hdr_size = sizeof(*mld2q); skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + - 8 + sizeof(*mldq)); + 8 + mld_hdr_size); if (!skb) goto out; @@ -486,7 +491,7 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, ip6h = ipv6_hdr(skb); *(__force __be32 *)ip6h = htonl(0x60000000); - ip6h->payload_len = htons(8 + sizeof(*mldq)); + ip6h->payload_len = htons(8 + mld_hdr_size); ip6h->nexthdr = IPPROTO_HOPOPTS; ip6h->hop_limit = 1; ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); @@ -514,26 +519,47 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, /* ICMPv6 */ skb_set_transport_header(skb, skb->len); - mldq = (struct mld_msg *) icmp6_hdr(skb); - interval = ipv6_addr_any(grp) ? br->multicast_query_response_interval : br->multicast_last_member_interval; - *igmp_type = ICMPV6_MGM_QUERY; - mldq->mld_type = ICMPV6_MGM_QUERY; - mldq->mld_code = 0; - mldq->mld_cksum = 0; - mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); - mldq->mld_reserved = 0; - mldq->mld_mca = *grp; - - /* checksum */ - mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, - sizeof(*mldq), IPPROTO_ICMPV6, - csum_partial(mldq, - sizeof(*mldq), 0)); - skb_put(skb, sizeof(*mldq)); + switch (br->multicast_mld_version) { + case 1: + mldq = (struct mld_msg *)icmp6_hdr(skb); + mldq->mld_type = ICMPV6_MGM_QUERY; + mldq->mld_code = 0; + mldq->mld_cksum = 0; + mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval)); + mldq->mld_reserved = 0; + mldq->mld_mca = *grp; + mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, + sizeof(*mldq), IPPROTO_ICMPV6, + csum_partial(mldq, + sizeof(*mldq), + 0)); + break; + case 2: + mld2q = (struct mld2_query *)icmp6_hdr(skb); + mld2q->mld2q_mrc = ntohs((u16)jiffies_to_msecs(interval)); + mld2q->mld2q_type = ICMPV6_MGM_QUERY; + mld2q->mld2q_code = 0; + mld2q->mld2q_cksum = 0; + mld2q->mld2q_resv1 = 0; + mld2q->mld2q_resv2 = 0; + mld2q->mld2q_suppress = 0; + mld2q->mld2q_qrv = 2; + mld2q->mld2q_nsrcs = 0; + mld2q->mld2q_qqic = br->multicast_query_interval / HZ; + mld2q->mld2q_mca = *grp; + mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, + sizeof(*mld2q), + IPPROTO_ICMPV6, + csum_partial(mld2q, + sizeof(*mld2q), + 0)); + break; + } + skb_put(skb, mld_hdr_size); __skb_pull(skb, sizeof(*eth)); @@ -1842,7 +1868,6 @@ void br_multicast_init(struct net_bridge *br) br->hash_elasticity = 4; br->hash_max = 512; - br->multicast_igmp_version = 2; br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY; br->multicast_querier = 0; br->multicast_query_use_ifaddr = 0; @@ -1858,7 +1883,9 @@ void br_multicast_init(struct net_bridge *br) br->ip4_other_query.delay_time = 0; br->ip4_querier.port = NULL; + br->multicast_igmp_version = 2; #if IS_ENABLED(CONFIG_IPV6) + br->multicast_mld_version = 1; br->ip6_other_query.delay_time = 0; br->ip6_querier.port = NULL; #endif @@ -2177,6 +2204,26 @@ int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val) return 0; } +#if IS_ENABLED(CONFIG_IPV6) +int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val) +{ + /* Currently we support version 1 and 2 */ + switch (val) { + case 1: + case 2: + break; + default: + return -EINVAL; + } + + spin_lock_bh(&br->multicast_lock); + br->multicast_mld_version = val; + spin_unlock_bh(&br->multicast_lock); + + return 0; +} +#endif + /** * br_multicast_list_adjacent - Returns snooped multicast addresses * @dev: The bridge port adjacent to which to retrieve addresses diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 10b9b80f778f..71c7453268c1 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -859,6 +859,7 @@ static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = { [IFLA_BR_VLAN_STATS_ENABLED] = { .type = NLA_U8 }, [IFLA_BR_MCAST_STATS_ENABLED] = { .type = NLA_U8 }, [IFLA_BR_MCAST_IGMP_VERSION] = { .type = NLA_U8 }, + [IFLA_BR_MCAST_MLD_VERSION] = { .type = NLA_U8 }, }; static int br_changelink(struct net_device *brdev, struct nlattr *tb[], @@ -1079,6 +1080,17 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[], if (err) return err; } + +#if IS_ENABLED(CONFIG_IPV6) + if (data[IFLA_BR_MCAST_MLD_VERSION]) { + __u8 mld_version; + + mld_version = nla_get_u8(data[IFLA_BR_MCAST_MLD_VERSION]); + err = br_multicast_set_mld_version(br, mld_version); + if (err) + return err; + } +#endif #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) if (data[IFLA_BR_NF_CALL_IPTABLES]) { @@ -1146,6 +1158,7 @@ static size_t br_get_size(const struct net_device *brdev) nla_total_size_64bit(sizeof(u64)) + /* IFLA_BR_MCAST_QUERY_RESPONSE_INTVL */ nla_total_size_64bit(sizeof(u64)) + /* IFLA_BR_MCAST_STARTUP_QUERY_INTVL */ nla_total_size(sizeof(u8)) + /* IFLA_BR_MCAST_IGMP_VERSION */ + nla_total_size(sizeof(u8)) + /* IFLA_BR_MCAST_MLD_VERSION */ #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) nla_total_size(sizeof(u8)) + /* IFLA_BR_NF_CALL_IPTABLES */ @@ -1225,7 +1238,11 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev) nla_put_u8(skb, IFLA_BR_MCAST_IGMP_VERSION, br->multicast_igmp_version)) return -EMSGSIZE; - +#if IS_ENABLED(CONFIG_IPV6) + if (nla_put_u8(skb, IFLA_BR_MCAST_MLD_VERSION, + br->multicast_mld_version)) + return -EMSGSIZE; +#endif clockval = jiffies_to_clock_t(br->multicast_last_member_interval); if (nla_put_u64_64bit(skb, IFLA_BR_MCAST_LAST_MEMBER_INTVL, clockval, IFLA_BR_PAD)) diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 3d207d92d899..26aec2366bc3 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -355,6 +355,7 @@ struct net_bridge struct bridge_mcast_other_query ip6_other_query; struct bridge_mcast_own_query ip6_own_query; struct bridge_mcast_querier ip6_querier; + u8 multicast_mld_version; #endif /* IS_ENABLED(CONFIG_IPV6) */ #endif @@ -585,6 +586,9 @@ int br_multicast_toggle(struct net_bridge *br, unsigned long val); int br_multicast_set_querier(struct net_bridge *br, unsigned long val); int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); +#if IS_ENABLED(CONFIG_IPV6) +int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); +#endif struct net_bridge_mdb_entry * br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); struct net_bridge_mdb_entry * diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c index f00d1690658c..c9d2e0abfb89 100644 --- a/net/bridge/br_sysfs_br.c +++ b/net/bridge/br_sysfs_br.c @@ -659,6 +659,25 @@ static ssize_t multicast_stats_enabled_store(struct device *d, return store_bridge_parm(d, buf, len, set_stats_enabled); } static DEVICE_ATTR_RW(multicast_stats_enabled); + +#if IS_ENABLED(CONFIG_IPV6) +static ssize_t multicast_mld_version_show(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct net_bridge *br = to_bridge(d); + + return sprintf(buf, "%u\n", br->multicast_mld_version); +} + +static ssize_t multicast_mld_version_store(struct device *d, + struct device_attribute *attr, + const char *buf, size_t len) +{ + return store_bridge_parm(d, buf, len, br_multicast_set_mld_version); +} +static DEVICE_ATTR_RW(multicast_mld_version); +#endif #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) static ssize_t nf_call_iptables_show( @@ -827,6 +846,9 @@ static struct attribute *bridge_attrs[] = { &dev_attr_multicast_startup_query_interval.attr, &dev_attr_multicast_stats_enabled.attr, &dev_attr_multicast_igmp_version.attr, +#if IS_ENABLED(CONFIG_IPV6) + &dev_attr_multicast_mld_version.attr, +#endif #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) &dev_attr_nf_call_iptables.attr, -- 2.30.2