[Bridge] [PATCH net-next v3 10/15] net: bridge: mcast: support for IGMPv3/MLDv2 ALLOW_NEW_SOURCES report
Nikolay Aleksandrov
nikolay at cumulusnetworks.com
Sat Sep 5 08:24:05 UTC 2020
This patch adds handling for the ALLOW_NEW_SOURCES IGMPv3/MLDv2 report
types and limits them only when multicast_igmp_version == 3 or
multicast_mld_version == 2 respectively. Now that IGMPv3/MLDv2 handling
functions will be managing timers we need to delay their activation, thus
a new argument is added which controls if the timer should be updated.
We also disable host IGMPv3/MLDv2 handling as it's not yet implemented and
could cause inconsistent group state, the host can only join a group as
EXCLUDE {} or leave it.
v3: Add IPv6/MLDv2 support
Signed-off-by: Nikolay Aleksandrov <nikolay at cumulusnetworks.com>
---
net/bridge/br_multicast.c | 163 ++++++++++++++++++++++++++++++++------
net/bridge/br_private.h | 7 ++
2 files changed, 144 insertions(+), 26 deletions(-)
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index e8d2f653344f..da9f36a75473 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -787,7 +787,8 @@ static int br_multicast_add_group(struct net_bridge *br,
struct net_bridge_port *port,
struct br_ip *group,
const unsigned char *src,
- u8 filter_mode)
+ u8 filter_mode,
+ bool update_timer)
{
struct net_bridge_port_group __rcu **pp;
struct net_bridge_port_group *p;
@@ -826,7 +827,8 @@ static int br_multicast_add_group(struct net_bridge *br,
br_mdb_notify(br->dev, mp, p, RTM_NEWMDB);
found:
- mod_timer(&p->timer, now + br->multicast_membership_interval);
+ if (update_timer)
+ mod_timer(&p->timer, now + br->multicast_membership_interval);
out:
err = 0;
@@ -840,7 +842,8 @@ static int br_ip4_multicast_add_group(struct net_bridge *br,
struct net_bridge_port *port,
__be32 group,
__u16 vid,
- const unsigned char *src)
+ const unsigned char *src,
+ bool update_timer)
{
struct br_ip br_group;
u8 filter_mode;
@@ -855,7 +858,8 @@ static int br_ip4_multicast_add_group(struct net_bridge *br,
filter_mode = br->multicast_igmp_version == 3 ? MCAST_INCLUDE :
MCAST_EXCLUDE;
- return br_multicast_add_group(br, port, &br_group, src, filter_mode);
+ return br_multicast_add_group(br, port, &br_group, src, filter_mode,
+ update_timer);
}
#if IS_ENABLED(CONFIG_IPV6)
@@ -863,7 +867,8 @@ static int br_ip6_multicast_add_group(struct net_bridge *br,
struct net_bridge_port *port,
const struct in6_addr *group,
__u16 vid,
- const unsigned char *src)
+ const unsigned char *src,
+ bool update_timer)
{
struct br_ip br_group;
u8 filter_mode;
@@ -878,7 +883,8 @@ static int br_ip6_multicast_add_group(struct net_bridge *br,
filter_mode = br->multicast_mld_version == 2 ? MCAST_INCLUDE :
MCAST_EXCLUDE;
- return br_multicast_add_group(br, port, &br_group, src, filter_mode);
+ return br_multicast_add_group(br, port, &br_group, src, filter_mode,
+ update_timer);
}
#endif
@@ -1225,20 +1231,72 @@ void br_multicast_disable_port(struct net_bridge_port *port)
spin_unlock(&br->multicast_lock);
}
+/* State Msg type New state Actions
+ * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
+ * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
+ * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
+ */
+static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg,
+ void *srcs, u32 nsrcs, size_t src_size)
+{
+ struct net_bridge *br = pg->port->br;
+ struct net_bridge_group_src *ent;
+ unsigned long now = jiffies;
+ bool changed = false;
+ struct br_ip src_ip;
+ u32 src_idx;
+
+ memset(&src_ip, 0, sizeof(src_ip));
+ src_ip.proto = pg->addr.proto;
+ for (src_idx = 0; src_idx < nsrcs; src_idx++) {
+ memcpy(&src_ip.u, srcs, src_size);
+ ent = br_multicast_find_group_src(pg, &src_ip);
+ if (!ent) {
+ ent = br_multicast_new_group_src(pg, &src_ip);
+ if (ent)
+ changed = true;
+ }
+
+ if (ent)
+ mod_timer(&ent->timer, now + br_multicast_gmi(br));
+ srcs += src_size;
+ }
+
+ return changed;
+}
+
+static struct net_bridge_port_group *
+br_multicast_find_port(struct net_bridge_mdb_entry *mp,
+ struct net_bridge_port *p,
+ const unsigned char *src)
+{
+ struct net_bridge_port_group *pg;
+ struct net_bridge *br = mp->br;
+
+ for (pg = mlock_dereference(mp->ports, br);
+ pg;
+ pg = mlock_dereference(pg->next, br))
+ if (br_port_group_equal(pg, p, src))
+ return pg;
+
+ return NULL;
+}
+
static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb,
u16 vid)
{
+ bool igmpv2 = br->multicast_igmp_version == 2;
+ struct net_bridge_mdb_entry *mdst;
+ struct net_bridge_port_group *pg;
const unsigned char *src;
struct igmpv3_report *ih;
struct igmpv3_grec *grec;
- int i;
- int len;
- int num;
- int type;
- int err = 0;
+ int i, len, num, type;
+ bool changed = false;
__be32 group;
+ int err = 0;
u16 nsrcs;
ih = igmpv3_report_hdr(skb);
@@ -1259,7 +1317,6 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
if (!ip_mc_may_pull(skb, len))
return -EINVAL;
- /* We treat this as an IGMPv2 report for now. */
switch (type) {
case IGMPV3_MODE_IS_INCLUDE:
case IGMPV3_MODE_IS_EXCLUDE:
@@ -1274,16 +1331,42 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
}
src = eth_hdr(skb)->h_source;
- if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
- type == IGMPV3_MODE_IS_INCLUDE) &&
- nsrcs == 0) {
- br_ip4_multicast_leave_group(br, port, group, vid, src);
+ if (nsrcs == 0 &&
+ (type == IGMPV3_CHANGE_TO_INCLUDE ||
+ type == IGMPV3_MODE_IS_INCLUDE)) {
+ if (!port || igmpv2) {
+ br_ip4_multicast_leave_group(br, port, group, vid, src);
+ continue;
+ }
} else {
err = br_ip4_multicast_add_group(br, port, group, vid,
- src);
+ src, igmpv2);
if (err)
break;
}
+
+ if (!port || igmpv2)
+ continue;
+
+ spin_lock_bh(&br->multicast_lock);
+ mdst = br_mdb_ip4_get(br, group, vid);
+ if (!mdst)
+ goto unlock_continue;
+ pg = br_multicast_find_port(mdst, port, src);
+ if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
+ goto unlock_continue;
+ /* reload grec */
+ grec = (void *)(skb->data + len - sizeof(*grec) - (nsrcs * 4));
+ switch (type) {
+ case IGMPV3_ALLOW_NEW_SOURCES:
+ changed = br_multicast_isinc_allow(pg, grec->grec_src,
+ nsrcs, sizeof(__be32));
+ break;
+ }
+ if (changed)
+ br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
+unlock_continue:
+ spin_unlock_bh(&br->multicast_lock);
}
return err;
@@ -1295,14 +1378,16 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
struct sk_buff *skb,
u16 vid)
{
+ bool mldv1 = br->multicast_mld_version == 1;
+ struct net_bridge_mdb_entry *mdst;
+ struct net_bridge_port_group *pg;
unsigned int nsrcs_offset;
const unsigned char *src;
struct icmp6hdr *icmp6h;
struct mld2_grec *grec;
unsigned int grec_len;
- int i;
- int len;
- int num;
+ bool changed = false;
+ int i, len, num;
int err = 0;
if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
@@ -1336,7 +1421,6 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
grec = (struct mld2_grec *)(skb->data + len);
len += grec_len;
- /* We treat these as MLDv1 reports for now. */
switch (grec->grec_type) {
case MLD2_MODE_IS_INCLUDE:
case MLD2_MODE_IS_EXCLUDE:
@@ -1354,15 +1438,41 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
nsrcs == 0) {
- br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
- vid, src);
+ if (!port || mldv1) {
+ br_ip6_multicast_leave_group(br, port,
+ &grec->grec_mca,
+ vid, src);
+ continue;
+ }
} else {
err = br_ip6_multicast_add_group(br, port,
&grec->grec_mca, vid,
- src);
+ src, mldv1);
if (err)
break;
}
+
+ if (!port || mldv1)
+ continue;
+
+ spin_lock_bh(&br->multicast_lock);
+ mdst = br_mdb_ip6_get(br, &grec->grec_mca, vid);
+ if (!mdst)
+ goto unlock_continue;
+ pg = br_multicast_find_port(mdst, port, src);
+ if (!pg || (pg->flags & MDB_PG_FLAGS_PERMANENT))
+ goto unlock_continue;
+ switch (grec->grec_type) {
+ case MLD2_ALLOW_NEW_SOURCES:
+ changed = br_multicast_isinc_allow(pg, grec->grec_src,
+ nsrcs,
+ sizeof(struct in6_addr));
+ break;
+ }
+ if (changed)
+ br_mdb_notify(br->dev, mdst, pg, RTM_NEWMDB);
+unlock_continue:
+ spin_unlock_bh(&br->multicast_lock);
}
return err;
@@ -1931,7 +2041,8 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMPV2_HOST_MEMBERSHIP_REPORT:
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
- err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
+ err = br_ip4_multicast_add_group(br, port, ih->group, vid, src,
+ true);
break;
case IGMPV3_HOST_MEMBERSHIP_REPORT:
err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
@@ -2010,7 +2121,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
src = eth_hdr(skb)->h_source;
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
- src);
+ src, true);
break;
case ICMPV6_MLD2_REPORT:
err = br_ip6_multicast_mld2_report(br, port, skb, vid);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index b2a226070846..fb35a73fc559 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -876,6 +876,13 @@ static inline unsigned long br_multicast_lmqt(const struct net_bridge *br)
return br->multicast_last_member_interval *
br->multicast_last_member_count;
}
+
+static inline unsigned long br_multicast_gmi(const struct net_bridge *br)
+{
+ /* use the RFC default of 2 for QRV */
+ return 2 * br->multicast_query_interval +
+ br->multicast_query_response_interval;
+}
#else
static inline int br_multicast_rcv(struct net_bridge *br,
struct net_bridge_port *port,
--
2.25.4
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