[Bridge] [PATCH net-next] net: bridge: extend MLD/IGMP query stats
Nikolay Aleksandrov
razor at blackwall.org
Wed Jul 6 19:12:21 UTC 2016
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 <linus.luessing at c0d3.blue>
Signed-off-by: Nikolay Aleksandrov <nikolay at cumulusnetworks.com>
---
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 @@ unlock:
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)
{
}
--
2.8.2
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