From a65056ecf4b48be0d0284a7b6a57b6dace10b843 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Wed, 6 Jul 2016 12:12:21 -0700 Subject: [PATCH] net: bridge: extend MLD/IGMP query stats MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As was suggested this patch adds support for the different versions of MLD and IGMP query types. Since the user visible structure is still in net-next we can augment it instead of adding netlink attributes. The distinction between the different IGMP/MLD query types is done as suggested in Section 7.1, RFC 3376 [1] and Section 8.1, RFC 3810 [2] based on query payload size and code for IGMP. Since all IGMP packets go through multicast_rcv() and it uses ip_mc_check_igmp/ipv6_mc_check_mld we can be sure that at least the ip/ipv6 header can be directly used. [1] https://tools.ietf.org/html/rfc3376#section-7 [2] https://tools.ietf.org/html/rfc3810#section-8.1 Suggested-by: Linus Lüssing Signed-off-by: Nikolay Aleksandrov Acked-by: Stephen Hemminger Signed-off-by: David S. Miller --- include/uapi/linux/if_bridge.h | 7 +++-- net/bridge/br_forward.c | 7 ++--- net/bridge/br_input.c | 2 +- net/bridge/br_multicast.c | 48 ++++++++++++++++++++++++++-------- net/bridge/br_private.h | 5 ++-- 5 files changed, 48 insertions(+), 21 deletions(-) diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h index 8304fe6f0561..c186f64fffca 100644 --- a/include/uapi/linux/if_bridge.h +++ b/include/uapi/linux/if_bridge.h @@ -261,14 +261,17 @@ enum { /* IGMP/MLD statistics */ struct br_mcast_stats { - __u64 igmp_queries[BR_MCAST_DIR_SIZE]; + __u64 igmp_v1queries[BR_MCAST_DIR_SIZE]; + __u64 igmp_v2queries[BR_MCAST_DIR_SIZE]; + __u64 igmp_v3queries[BR_MCAST_DIR_SIZE]; __u64 igmp_leaves[BR_MCAST_DIR_SIZE]; __u64 igmp_v1reports[BR_MCAST_DIR_SIZE]; __u64 igmp_v2reports[BR_MCAST_DIR_SIZE]; __u64 igmp_v3reports[BR_MCAST_DIR_SIZE]; __u64 igmp_parse_errors; - __u64 mld_queries[BR_MCAST_DIR_SIZE]; + __u64 mld_v1queries[BR_MCAST_DIR_SIZE]; + __u64 mld_v2queries[BR_MCAST_DIR_SIZE]; __u64 mld_leaves[BR_MCAST_DIR_SIZE]; __u64 mld_v1reports[BR_MCAST_DIR_SIZE]; __u64 mld_v2reports[BR_MCAST_DIR_SIZE]; diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index 6c196037d818..d610644368b9 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -199,7 +199,6 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb, bool unicast) { u8 igmp_type = br_multicast_igmp_type(skb); - __be16 proto = skb->protocol; struct net_bridge_port *prev; struct net_bridge_port *p; @@ -221,7 +220,7 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb, if (IS_ERR(prev)) goto out; if (prev == p) - br_multicast_count(p->br, p, proto, igmp_type, + br_multicast_count(p->br, p, skb, igmp_type, BR_MCAST_DIR_TX); } @@ -266,8 +265,6 @@ static void br_multicast_flood(struct net_bridge_mdb_entry *mdst, struct net_bridge *br = netdev_priv(dev); struct net_bridge_port *prev = NULL; struct net_bridge_port_group *p; - __be16 proto = skb->protocol; - struct hlist_node *rp; rp = rcu_dereference(hlist_first_rcu(&br->router_list)); @@ -286,7 +283,7 @@ static void br_multicast_flood(struct net_bridge_mdb_entry *mdst, if (IS_ERR(prev)) goto out; if (prev == port) - br_multicast_count(port->br, port, proto, igmp_type, + br_multicast_count(port->br, port, skb, igmp_type, BR_MCAST_DIR_TX); if ((unsigned long)lport >= (unsigned long)port) diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 786602bc0567..a7817e6f306f 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -61,7 +61,7 @@ static int br_pass_frame_up(struct sk_buff *skb) if (!skb) return NET_RX_DROP; /* update the multicast stats if the packet is IGMP/MLD */ - br_multicast_count(br, NULL, skb->protocol, br_multicast_igmp_type(skb), + br_multicast_count(br, NULL, skb, br_multicast_igmp_type(skb), BR_MCAST_DIR_TX); return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index e405eef0ae2e..a5423a1eec05 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -843,14 +843,14 @@ static void __br_multicast_send_query(struct net_bridge *br, if (port) { skb->dev = port->dev; - br_multicast_count(br, port, skb->protocol, igmp_type, + br_multicast_count(br, port, skb, igmp_type, BR_MCAST_DIR_TX); NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, dev_net(port->dev), NULL, skb, NULL, skb->dev, br_dev_queue_push_xmit); } else { br_multicast_select_own_querier(br, ip, skb); - br_multicast_count(br, port, skb->protocol, igmp_type, + br_multicast_count(br, port, skb, igmp_type, BR_MCAST_DIR_RX); netif_rx(skb); } @@ -1676,7 +1676,7 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br, if (skb_trimmed && skb_trimmed != skb) kfree_skb(skb_trimmed); - br_multicast_count(br, port, skb->protocol, BR_INPUT_SKB_CB(skb)->igmp, + br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, BR_MCAST_DIR_RX); return err; @@ -1725,7 +1725,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, if (skb_trimmed && skb_trimmed != skb) kfree_skb(skb_trimmed); - br_multicast_count(br, port, skb->protocol, BR_INPUT_SKB_CB(skb)->igmp, + br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp, BR_MCAST_DIR_RX); return err; @@ -2251,13 +2251,16 @@ bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent); static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, - __be16 proto, u8 type, u8 dir) + const struct sk_buff *skb, u8 type, u8 dir) { struct bridge_mcast_stats *pstats = this_cpu_ptr(stats); + __be16 proto = skb->protocol; + unsigned int t_len; u64_stats_update_begin(&pstats->syncp); switch (proto) { case htons(ETH_P_IP): + t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); switch (type) { case IGMP_HOST_MEMBERSHIP_REPORT: pstats->mstats.igmp_v1reports[dir]++; @@ -2269,7 +2272,21 @@ static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, pstats->mstats.igmp_v3reports[dir]++; break; case IGMP_HOST_MEMBERSHIP_QUERY: - pstats->mstats.igmp_queries[dir]++; + if (t_len != sizeof(struct igmphdr)) { + pstats->mstats.igmp_v3queries[dir]++; + } else { + unsigned int offset = skb_transport_offset(skb); + struct igmphdr *ih, _ihdr; + + ih = skb_header_pointer(skb, offset, + sizeof(_ihdr), &_ihdr); + if (!ih) + break; + if (!ih->code) + pstats->mstats.igmp_v1queries[dir]++; + else + pstats->mstats.igmp_v2queries[dir]++; + } break; case IGMP_HOST_LEAVE_MESSAGE: pstats->mstats.igmp_leaves[dir]++; @@ -2278,6 +2295,9 @@ static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, break; #if IS_ENABLED(CONFIG_IPV6) case htons(ETH_P_IPV6): + t_len = ntohs(ipv6_hdr(skb)->payload_len) + + sizeof(struct ipv6hdr); + t_len -= skb_network_header_len(skb); switch (type) { case ICMPV6_MGM_REPORT: pstats->mstats.mld_v1reports[dir]++; @@ -2286,7 +2306,10 @@ static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, pstats->mstats.mld_v2reports[dir]++; break; case ICMPV6_MGM_QUERY: - pstats->mstats.mld_queries[dir]++; + if (t_len != sizeof(struct mld_msg)) + pstats->mstats.mld_v2queries[dir]++; + else + pstats->mstats.mld_v1queries[dir]++; break; case ICMPV6_MGM_REDUCTION: pstats->mstats.mld_leaves[dir]++; @@ -2299,7 +2322,7 @@ static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats, } void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, - __be16 proto, u8 type, u8 dir) + const struct sk_buff *skb, u8 type, u8 dir) { struct bridge_mcast_stats __percpu *stats; @@ -2314,7 +2337,7 @@ void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, if (WARN_ON(!stats)) return; - br_mcast_stats_add(stats, proto, type, dir); + br_mcast_stats_add(stats, skb, type, dir); } int br_multicast_init_stats(struct net_bridge *br) @@ -2359,14 +2382,17 @@ void br_multicast_get_stats(const struct net_bridge *br, memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); - mcast_stats_add_dir(tdst.igmp_queries, temp.igmp_queries); + mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); + mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries); + mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries); mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves); mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports); mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports); mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports); tdst.igmp_parse_errors += temp.igmp_parse_errors; - mcast_stats_add_dir(tdst.mld_queries, temp.mld_queries); + mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries); + mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries); mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves); mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports); mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports); diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 4dc851166ad1..40f200947ddc 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -586,7 +586,7 @@ void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, int type); void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, - __be16 proto, u8 type, u8 dir); + const struct sk_buff *skb, u8 type, u8 dir); int br_multicast_init_stats(struct net_bridge *br); void br_multicast_get_stats(const struct net_bridge *br, const struct net_bridge_port *p, @@ -719,7 +719,8 @@ static inline void br_mdb_uninit(void) static inline void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, - __be16 proto, u8 type, u8 dir) + const struct sk_buff *skb, + u8 type, u8 dir) { }