diff options
-rw-r--r-- | include/linux/if_bridge.h | 1 | ||||
-rw-r--r-- | include/uapi/linux/if_link.h | 1 | ||||
-rw-r--r-- | net/bridge/br_forward.c | 39 | ||||
-rw-r--r-- | net/bridge/br_mdb.c | 2 | ||||
-rw-r--r-- | net/bridge/br_multicast.c | 90 | ||||
-rw-r--r-- | net/bridge/br_netlink.c | 5 | ||||
-rw-r--r-- | net/bridge/br_private.h | 3 | ||||
-rw-r--r-- | net/bridge/br_sysfs_if.c | 2 |
8 files changed, 114 insertions, 29 deletions
diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h index c6587c01d951..debc9d5904e5 100644 --- a/include/linux/if_bridge.h +++ b/include/linux/if_bridge.h @@ -46,6 +46,7 @@ struct br_ip_list { #define BR_LEARNING_SYNC BIT(9) #define BR_PROXYARP_WIFI BIT(10) #define BR_MCAST_FLOOD BIT(11) +#define BR_MULTICAST_TO_UNICAST BIT(12) #define BR_DEFAULT_AGEING_TIME (300 * HZ) diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 184b16ed2b84..b9aa5641ebe5 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -321,6 +321,7 @@ enum { IFLA_BRPORT_MULTICAST_ROUTER, IFLA_BRPORT_PAD, IFLA_BRPORT_MCAST_FLOOD, + IFLA_BRPORT_MCAST_TO_UCAST, __IFLA_BRPORT_MAX }; #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1) diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index 7cb41aee4c82..a0f9d0037d24 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -174,6 +174,31 @@ out: return p; } +static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb, + const unsigned char *addr, bool local_orig) +{ + struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev; + const unsigned char *src = eth_hdr(skb)->h_source; + + if (!should_deliver(p, skb)) + return; + + /* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */ + if (skb->dev == p->dev && ether_addr_equal(src, addr)) + return; + + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) { + dev->stats.tx_dropped++; + return; + } + + if (!is_broadcast_ether_addr(addr)) + memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN); + + __br_forward(p, skb, local_orig); +} + /* called under rcu_read_lock */ void br_flood(struct net_bridge *br, struct sk_buff *skb, enum br_pkt_type pkt_type, bool local_rcv, bool local_orig) @@ -241,10 +266,20 @@ void br_multicast_flood(struct net_bridge_mdb_entry *mdst, rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) : NULL; - port = (unsigned long)lport > (unsigned long)rport ? - lport : rport; + if ((unsigned long)lport > (unsigned long)rport) { + port = lport; + + if (port->flags & BR_MULTICAST_TO_UNICAST) { + maybe_deliver_addr(lport, skb, p->eth_addr, + local_orig); + goto delivered; + } + } else { + port = rport; + } prev = maybe_deliver(prev, port, skb, local_orig); +delivered: if (IS_ERR(prev)) goto out; if (prev == port) diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c index 7dbc80d01eb0..056e6ac49d8f 100644 --- a/net/bridge/br_mdb.c +++ b/net/bridge/br_mdb.c @@ -531,7 +531,7 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, break; } - p = br_multicast_new_port_group(port, group, *pp, state); + p = br_multicast_new_port_group(port, group, *pp, state, NULL); if (unlikely(!p)) return -ENOMEM; rcu_assign_pointer(*pp, p); diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index f66346122dc4..1de3438e36bf 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -43,12 +43,14 @@ static void br_multicast_add_router(struct net_bridge *br, static void br_ip4_multicast_leave_group(struct net_bridge *br, struct net_bridge_port *port, __be32 group, - __u16 vid); + __u16 vid, + const unsigned char *src); + #if IS_ENABLED(CONFIG_IPV6) static void br_ip6_multicast_leave_group(struct net_bridge *br, struct net_bridge_port *port, const struct in6_addr *group, - __u16 vid); + __u16 vid, const unsigned char *src); #endif unsigned int br_mdb_rehash_seq; @@ -711,7 +713,8 @@ struct net_bridge_port_group *br_multicast_new_port_group( struct net_bridge_port *port, struct br_ip *group, struct net_bridge_port_group __rcu *next, - unsigned char flags) + unsigned char flags, + const unsigned char *src) { struct net_bridge_port_group *p; @@ -726,12 +729,32 @@ struct net_bridge_port_group *br_multicast_new_port_group( hlist_add_head(&p->mglist, &port->mglist); setup_timer(&p->timer, br_multicast_port_group_expired, (unsigned long)p); + + if (src) + memcpy(p->eth_addr, src, ETH_ALEN); + else + memset(p->eth_addr, 0xff, ETH_ALEN); + return p; } +static bool br_port_group_equal(struct net_bridge_port_group *p, + struct net_bridge_port *port, + const unsigned char *src) +{ + if (p->port != port) + return false; + + if (!(port->flags & BR_MULTICAST_TO_UNICAST)) + return true; + + return ether_addr_equal(src, p->eth_addr); +} + static int br_multicast_add_group(struct net_bridge *br, struct net_bridge_port *port, - struct br_ip *group) + struct br_ip *group, + const unsigned char *src) { struct net_bridge_port_group __rcu **pp; struct net_bridge_port_group *p; @@ -758,13 +781,13 @@ static int br_multicast_add_group(struct net_bridge *br, for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL; pp = &p->next) { - if (p->port == port) + if (br_port_group_equal(p, port, src)) goto found; if ((unsigned long)p->port < (unsigned long)port) break; } - p = br_multicast_new_port_group(port, group, *pp, 0); + p = br_multicast_new_port_group(port, group, *pp, 0, src); if (unlikely(!p)) goto err; rcu_assign_pointer(*pp, p); @@ -783,7 +806,8 @@ err: static int br_ip4_multicast_add_group(struct net_bridge *br, struct net_bridge_port *port, __be32 group, - __u16 vid) + __u16 vid, + const unsigned char *src) { struct br_ip br_group; @@ -794,14 +818,15 @@ static int br_ip4_multicast_add_group(struct net_bridge *br, br_group.proto = htons(ETH_P_IP); br_group.vid = vid; - return br_multicast_add_group(br, port, &br_group); + return br_multicast_add_group(br, port, &br_group, src); } #if IS_ENABLED(CONFIG_IPV6) static int br_ip6_multicast_add_group(struct net_bridge *br, struct net_bridge_port *port, const struct in6_addr *group, - __u16 vid) + __u16 vid, + const unsigned char *src) { struct br_ip br_group; @@ -812,7 +837,7 @@ static int br_ip6_multicast_add_group(struct net_bridge *br, br_group.proto = htons(ETH_P_IPV6); br_group.vid = vid; - return br_multicast_add_group(br, port, &br_group); + return br_multicast_add_group(br, port, &br_group, src); } #endif @@ -1081,6 +1106,7 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br, struct sk_buff *skb, u16 vid) { + const unsigned char *src; struct igmpv3_report *ih; struct igmpv3_grec *grec; int i; @@ -1121,12 +1147,14 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br, continue; } + src = eth_hdr(skb)->h_source; if ((type == IGMPV3_CHANGE_TO_INCLUDE || type == IGMPV3_MODE_IS_INCLUDE) && ntohs(grec->grec_nsrcs) == 0) { - br_ip4_multicast_leave_group(br, port, group, vid); + br_ip4_multicast_leave_group(br, port, group, vid, src); } else { - err = br_ip4_multicast_add_group(br, port, group, vid); + err = br_ip4_multicast_add_group(br, port, group, vid, + src); if (err) break; } @@ -1141,6 +1169,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br, struct sk_buff *skb, u16 vid) { + const unsigned char *src; struct icmp6hdr *icmp6h; struct mld2_grec *grec; int i; @@ -1188,14 +1217,16 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br, continue; } + src = eth_hdr(skb)->h_source; if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE || grec->grec_type == MLD2_MODE_IS_INCLUDE) && ntohs(*nsrcs) == 0) { br_ip6_multicast_leave_group(br, port, &grec->grec_mca, - vid); + vid, src); } else { err = br_ip6_multicast_add_group(br, port, - &grec->grec_mca, vid); + &grec->grec_mca, vid, + src); if (err) break; } @@ -1511,7 +1542,8 @@ br_multicast_leave_group(struct net_bridge *br, struct net_bridge_port *port, struct br_ip *group, struct bridge_mcast_other_query *other_query, - struct bridge_mcast_own_query *own_query) + struct bridge_mcast_own_query *own_query, + const unsigned char *src) { struct net_bridge_mdb_htable *mdb; struct net_bridge_mdb_entry *mp; @@ -1535,7 +1567,7 @@ br_multicast_leave_group(struct net_bridge *br, for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL; pp = &p->next) { - if (p->port != port) + if (!br_port_group_equal(p, port, src)) continue; rcu_assign_pointer(*pp, p->next); @@ -1566,7 +1598,7 @@ br_multicast_leave_group(struct net_bridge *br, for (p = mlock_dereference(mp->ports, br); p != NULL; p = mlock_dereference(p->next, br)) { - if (p->port != port) + if (!br_port_group_equal(p, port, src)) continue; if (!hlist_unhashed(&p->mglist) && @@ -1617,7 +1649,8 @@ out: static void br_ip4_multicast_leave_group(struct net_bridge *br, struct net_bridge_port *port, __be32 group, - __u16 vid) + __u16 vid, + const unsigned char *src) { struct br_ip br_group; struct bridge_mcast_own_query *own_query; @@ -1632,14 +1665,15 @@ static void br_ip4_multicast_leave_group(struct net_bridge *br, br_group.vid = vid; br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query, - own_query); + own_query, src); } #if IS_ENABLED(CONFIG_IPV6) static void br_ip6_multicast_leave_group(struct net_bridge *br, struct net_bridge_port *port, const struct in6_addr *group, - __u16 vid) + __u16 vid, + const unsigned char *src) { struct br_ip br_group; struct bridge_mcast_own_query *own_query; @@ -1654,7 +1688,7 @@ static void br_ip6_multicast_leave_group(struct net_bridge *br, br_group.vid = vid; br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query, - own_query); + own_query, src); } #endif @@ -1712,6 +1746,7 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br, u16 vid) { struct sk_buff *skb_trimmed = NULL; + const unsigned char *src; struct igmphdr *ih; int err; @@ -1731,13 +1766,14 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br, } ih = igmp_hdr(skb); + src = eth_hdr(skb)->h_source; BR_INPUT_SKB_CB(skb)->igmp = ih->type; switch (ih->type) { 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); + err = br_ip4_multicast_add_group(br, port, ih->group, vid, src); break; case IGMPV3_HOST_MEMBERSHIP_REPORT: err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid); @@ -1746,7 +1782,7 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br, err = br_ip4_multicast_query(br, port, skb_trimmed, vid); break; case IGMP_HOST_LEAVE_MESSAGE: - br_ip4_multicast_leave_group(br, port, ih->group, vid); + br_ip4_multicast_leave_group(br, port, ih->group, vid, src); break; } @@ -1766,6 +1802,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, u16 vid) { struct sk_buff *skb_trimmed = NULL; + const unsigned char *src; struct mld_msg *mld; int err; @@ -1785,8 +1822,10 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, switch (mld->mld_type) { case ICMPV6_MGM_REPORT: + 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); + err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid, + src); break; case ICMPV6_MLD2_REPORT: err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid); @@ -1795,7 +1834,8 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, err = br_ip6_multicast_query(br, port, skb_trimmed, vid); break; case ICMPV6_MGM_REDUCTION: - br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); + src = eth_hdr(skb)->h_source; + br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src); break; } diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 71c7453268c1..6c087cd049b9 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -123,6 +123,7 @@ static inline size_t br_port_info_size(void) + nla_total_size(1) /* IFLA_BRPORT_GUARD */ + nla_total_size(1) /* IFLA_BRPORT_PROTECT */ + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */ + + nla_total_size(1) /* IFLA_BRPORT_MCAST_TO_UCAST */ + nla_total_size(1) /* IFLA_BRPORT_LEARNING */ + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */ + nla_total_size(1) /* IFLA_BRPORT_PROXYARP */ @@ -173,6 +174,8 @@ static int br_port_fill_attrs(struct sk_buff *skb, !!(p->flags & BR_ROOT_BLOCK)) || nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) || + nla_put_u8(skb, IFLA_BRPORT_MCAST_TO_UCAST, + !!(p->flags & BR_MULTICAST_TO_UNICAST)) || nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) || nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) || @@ -586,6 +589,7 @@ static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = { [IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 }, [IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 }, [IFLA_BRPORT_MULTICAST_ROUTER] = { .type = NLA_U8 }, + [IFLA_BRPORT_MCAST_TO_UCAST] = { .type = NLA_U8 }, }; /* Change the state of the port and notify spanning tree */ @@ -636,6 +640,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING); br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD); br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD); + br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST, BR_MULTICAST_TO_UNICAST); br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP); br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI); diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 8ce621e8345c..0b82a227fc34 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -177,6 +177,7 @@ struct net_bridge_port_group { struct timer_list timer; struct br_ip addr; unsigned char flags; + unsigned char eth_addr[ETH_ALEN]; }; struct net_bridge_mdb_entry @@ -599,7 +600,7 @@ void br_multicast_free_pg(struct rcu_head *head); struct net_bridge_port_group * br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, struct net_bridge_port_group __rcu *next, - unsigned char flags); + unsigned char flags, const unsigned char *src); void br_mdb_init(void); void br_mdb_uninit(void); void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c index 8bd569695e76..05e8946ccc03 100644 --- a/net/bridge/br_sysfs_if.c +++ b/net/bridge/br_sysfs_if.c @@ -188,6 +188,7 @@ static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router, store_multicast_router); BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE); +BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST); #endif static const struct brport_attribute *brport_attrs[] = { @@ -214,6 +215,7 @@ static const struct brport_attribute *brport_attrs[] = { #ifdef CONFIG_BRIDGE_IGMP_SNOOPING &brport_attr_multicast_router, &brport_attr_multicast_fast_leave, + &brport_attr_multicast_to_unicast, #endif &brport_attr_proxyarp, &brport_attr_proxyarp_wifi, |