From 42c11ccfe844c1df91599428d87101e07e389901 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Mon, 7 Sep 2020 12:56:10 +0300 Subject: [PATCH] net: bridge: mcast: add support for group query retransmit We need to be able to retransmit group-specific and group-and-source specific queries. The new timer takes care of those. v3: add IPv6 support Signed-off-by: Nikolay Aleksandrov Signed-off-by: Jakub Kicinski --- net/bridge/br_multicast.c | 73 +++++++++++++++++++++++++++++++++------ net/bridge/br_private.h | 8 +++++ 2 files changed, 71 insertions(+), 10 deletions(-) diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index cfb9533447c7..ab3ab75f954d 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -50,6 +50,7 @@ static void br_ip4_multicast_leave_group(struct net_bridge *br, __be32 group, __u16 vid, const unsigned char *src); +static void br_multicast_port_group_rexmit(struct timer_list *t); static void __del_port_router(struct net_bridge_port *p); #if IS_ENABLED(CONFIG_IPV6) @@ -184,6 +185,7 @@ void br_multicast_del_pg(struct net_bridge_mdb_entry *mp, rcu_assign_pointer(*pp, pg->next); hlist_del_init(&pg->mglist); del_timer(&pg->timer); + del_timer(&pg->rexmit_timer); hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) br_multicast_del_group_src(ent); br_mdb_notify(br->dev, pg->port, &pg->addr, RTM_DELMDB, pg->flags); @@ -237,7 +239,8 @@ static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, struct net_bridge_port_group *pg, __be32 ip_dst, __be32 group, bool with_srcs, bool over_lmqt, - u8 sflag, u8 *igmp_type) + u8 sflag, u8 *igmp_type, + bool *need_rexmit) { struct net_bridge_port *p = pg ? pg->port : NULL; struct net_bridge_group_src *ent; @@ -352,6 +355,8 @@ static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br, ent->src_query_rexmit_cnt > 0) { ihv3->srcs[lmqt_srcs++] = ent->addr.u.ip4; ent->src_query_rexmit_cnt--; + if (need_rexmit && ent->src_query_rexmit_cnt) + *need_rexmit = true; } } if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) { @@ -380,7 +385,8 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, const struct in6_addr *ip6_dst, const struct in6_addr *group, bool with_srcs, bool over_llqt, - u8 sflag, u8 *igmp_type) + u8 sflag, u8 *igmp_type, + bool *need_rexmit) { struct net_bridge_port *p = pg ? pg->port : NULL; struct net_bridge_group_src *ent; @@ -510,6 +516,8 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, ent->src_query_rexmit_cnt > 0) { mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.u.ip6; ent->src_query_rexmit_cnt--; + if (need_rexmit && ent->src_query_rexmit_cnt) + *need_rexmit = true; } } if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) { @@ -540,7 +548,8 @@ static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, struct br_ip *ip_dst, struct br_ip *group, bool with_srcs, bool over_lmqt, - u8 sflag, u8 *igmp_type) + u8 sflag, u8 *igmp_type, + bool *need_rexmit) { __be32 ip4_dst; @@ -550,7 +559,8 @@ static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, return br_ip4_multicast_alloc_query(br, pg, ip4_dst, group->u.ip4, with_srcs, over_lmqt, - sflag, igmp_type); + sflag, igmp_type, + need_rexmit); #if IS_ENABLED(CONFIG_IPV6) case htons(ETH_P_IPV6): { struct in6_addr ip6_dst; @@ -564,7 +574,8 @@ static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br, return br_ip6_multicast_alloc_query(br, pg, &ip6_dst, &group->u.ip6, with_srcs, over_lmqt, - sflag, igmp_type); + sflag, igmp_type, + need_rexmit); } #endif } @@ -708,8 +719,9 @@ struct net_bridge_port_group *br_multicast_new_port_group( p->filter_mode = filter_mode; INIT_HLIST_HEAD(&p->src_list); rcu_assign_pointer(p->next, next); - hlist_add_head(&p->mglist, &port->mglist); timer_setup(&p->timer, br_multicast_port_group_expired, 0); + timer_setup(&p->rexmit_timer, br_multicast_port_group_rexmit, 0); + hlist_add_head(&p->mglist, &port->mglist); if (src) memcpy(p->eth_addr, src, ETH_ALEN); @@ -943,7 +955,8 @@ static void __br_multicast_send_query(struct net_bridge *br, struct br_ip *ip_dst, struct br_ip *group, bool with_srcs, - u8 sflag) + u8 sflag, + bool *need_rexmit) { bool over_lmqt = !!sflag; struct sk_buff *skb; @@ -951,7 +964,8 @@ static void __br_multicast_send_query(struct net_bridge *br, again_under_lmqt: skb = br_multicast_alloc_query(br, pg, ip_dst, group, with_srcs, - over_lmqt, sflag, &igmp_type); + over_lmqt, sflag, &igmp_type, + need_rexmit); if (!skb) return; @@ -1004,7 +1018,8 @@ static void br_multicast_send_query(struct net_bridge *br, if (!other_query || timer_pending(&other_query->timer)) return; - __br_multicast_send_query(br, port, NULL, NULL, &br_group, false, 0); + __br_multicast_send_query(br, port, NULL, NULL, &br_group, false, 0, + NULL); time = jiffies; time += own_query->startup_sent < br->multicast_startup_query_count ? @@ -1049,6 +1064,44 @@ static void br_ip6_multicast_port_query_expired(struct timer_list *t) } #endif +static void br_multicast_port_group_rexmit(struct timer_list *t) +{ + struct net_bridge_port_group *pg = from_timer(pg, t, rexmit_timer); + struct bridge_mcast_other_query *other_query = NULL; + struct net_bridge *br = pg->port->br; + bool need_rexmit = false; + + spin_lock(&br->multicast_lock); + if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || + !br_opt_get(br, BROPT_MULTICAST_ENABLED) || + !br_opt_get(br, BROPT_MULTICAST_QUERIER)) + goto out; + + if (pg->addr.proto == htons(ETH_P_IP)) + other_query = &br->ip4_other_query; +#if IS_ENABLED(CONFIG_IPV6) + else + other_query = &br->ip6_other_query; +#endif + + if (!other_query || timer_pending(&other_query->timer)) + goto out; + + if (pg->grp_query_rexmit_cnt) { + pg->grp_query_rexmit_cnt--; + __br_multicast_send_query(br, pg->port, pg, &pg->addr, + &pg->addr, false, 1, NULL); + } + __br_multicast_send_query(br, pg->port, pg, &pg->addr, + &pg->addr, true, 0, &need_rexmit); + + if (pg->grp_query_rexmit_cnt || need_rexmit) + mod_timer(&pg->rexmit_timer, jiffies + + br->multicast_last_member_interval); +out: + spin_unlock(&br->multicast_lock); +} + static void br_mc_disabled_update(struct net_device *dev, bool value) { struct switchdev_attr attr = { @@ -1658,7 +1711,7 @@ br_multicast_leave_group(struct net_bridge *br, if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { __br_multicast_send_query(br, port, NULL, NULL, &mp->addr, - false, 0); + false, 0, NULL); time = jiffies + br->multicast_last_member_count * br->multicast_last_member_interval; diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index e0632721b1ef..da8df273dd4a 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -240,10 +240,12 @@ struct net_bridge_port_group { unsigned char eth_addr[ETH_ALEN] __aligned(2); unsigned char flags; unsigned char filter_mode; + unsigned char grp_query_rexmit_cnt; struct hlist_head src_list; unsigned int src_ents; struct timer_list timer; + struct timer_list rexmit_timer; struct hlist_node mglist; struct rcu_head rcu; @@ -868,6 +870,12 @@ static inline int br_multicast_igmp_type(const struct sk_buff *skb) { return BR_INPUT_SKB_CB(skb)->igmp; } + +static inline unsigned long br_multicast_lmqt(const struct net_bridge *br) +{ + return br->multicast_last_member_interval * + br->multicast_last_member_count; +} #else static inline int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,