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![Vladimir Oltean](/assets/img/avatar_default.png)
When creating a new multicast port group, there is implicit conversion between the __u8 state member of struct br_mdb_entry and the unsigned char flags member of struct net_bridge_port_group. This implicit conversion relies on the fact that MDB_PERMANENT is equal to MDB_PG_FLAGS_PERMANENT. Let's be more explicit and convert the state to flags manually. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20201028234815.613226-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1138 lines
27 KiB
C
1138 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/err.h>
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#include <linux/igmp.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/if_ether.h>
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#include <net/ip.h>
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#include <net/netlink.h>
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#include <net/switchdev.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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#endif
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#include "br_private.h"
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static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
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struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p;
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struct nlattr *nest, *port_nest;
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if (!br->multicast_router || hlist_empty(&br->router_list))
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return 0;
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nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
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if (nest == NULL)
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return -EMSGSIZE;
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hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
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if (!p)
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continue;
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port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
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if (!port_nest)
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goto fail;
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if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
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nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
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br_timer_value(&p->multicast_router_timer)) ||
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nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
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p->multicast_router)) {
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nla_nest_cancel(skb, port_nest);
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goto fail;
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}
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nla_nest_end(skb, port_nest);
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}
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nla_nest_end(skb, nest);
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return 0;
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fail:
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nla_nest_cancel(skb, nest);
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return -EMSGSIZE;
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}
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static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
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{
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e->state = flags & MDB_PG_FLAGS_PERMANENT;
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e->flags = 0;
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if (flags & MDB_PG_FLAGS_OFFLOAD)
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e->flags |= MDB_FLAGS_OFFLOAD;
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if (flags & MDB_PG_FLAGS_FAST_LEAVE)
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e->flags |= MDB_FLAGS_FAST_LEAVE;
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if (flags & MDB_PG_FLAGS_STAR_EXCL)
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e->flags |= MDB_FLAGS_STAR_EXCL;
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if (flags & MDB_PG_FLAGS_BLOCKED)
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e->flags |= MDB_FLAGS_BLOCKED;
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}
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static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip,
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struct nlattr **mdb_attrs)
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{
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memset(ip, 0, sizeof(struct br_ip));
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ip->vid = entry->vid;
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ip->proto = entry->addr.proto;
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switch (ip->proto) {
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case htons(ETH_P_IP):
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ip->dst.ip4 = entry->addr.u.ip4;
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if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
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ip->src.ip4 = nla_get_in_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case htons(ETH_P_IPV6):
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ip->dst.ip6 = entry->addr.u.ip6;
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if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
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ip->src.ip6 = nla_get_in6_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
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break;
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#endif
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default:
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ether_addr_copy(ip->dst.mac_addr, entry->addr.u.mac_addr);
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}
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}
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static int __mdb_fill_srcs(struct sk_buff *skb,
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struct net_bridge_port_group *p)
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{
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struct net_bridge_group_src *ent;
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struct nlattr *nest, *nest_ent;
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if (hlist_empty(&p->src_list))
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return 0;
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nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST);
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if (!nest)
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return -EMSGSIZE;
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hlist_for_each_entry_rcu(ent, &p->src_list, node,
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lockdep_is_held(&p->key.port->br->multicast_lock)) {
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nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY);
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if (!nest_ent)
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goto out_cancel_err;
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switch (ent->addr.proto) {
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case htons(ETH_P_IP):
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if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
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ent->addr.src.ip4)) {
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nla_nest_cancel(skb, nest_ent);
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goto out_cancel_err;
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}
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case htons(ETH_P_IPV6):
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if (nla_put_in6_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
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&ent->addr.src.ip6)) {
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nla_nest_cancel(skb, nest_ent);
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goto out_cancel_err;
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}
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break;
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#endif
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default:
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nla_nest_cancel(skb, nest_ent);
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continue;
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}
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if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER,
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br_timer_value(&ent->timer))) {
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nla_nest_cancel(skb, nest_ent);
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goto out_cancel_err;
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}
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nla_nest_end(skb, nest_ent);
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}
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nla_nest_end(skb, nest);
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return 0;
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out_cancel_err:
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nla_nest_cancel(skb, nest);
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return -EMSGSIZE;
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}
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static int __mdb_fill_info(struct sk_buff *skb,
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struct net_bridge_mdb_entry *mp,
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struct net_bridge_port_group *p)
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{
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bool dump_srcs_mode = false;
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struct timer_list *mtimer;
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struct nlattr *nest_ent;
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struct br_mdb_entry e;
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u8 flags = 0;
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int ifindex;
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memset(&e, 0, sizeof(e));
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if (p) {
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ifindex = p->key.port->dev->ifindex;
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mtimer = &p->timer;
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flags = p->flags;
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} else {
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ifindex = mp->br->dev->ifindex;
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mtimer = &mp->timer;
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}
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__mdb_entry_fill_flags(&e, flags);
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e.ifindex = ifindex;
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e.vid = mp->addr.vid;
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if (mp->addr.proto == htons(ETH_P_IP))
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e.addr.u.ip4 = mp->addr.dst.ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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else if (mp->addr.proto == htons(ETH_P_IPV6))
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e.addr.u.ip6 = mp->addr.dst.ip6;
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#endif
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else
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ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
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e.addr.proto = mp->addr.proto;
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nest_ent = nla_nest_start_noflag(skb,
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MDBA_MDB_ENTRY_INFO);
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if (!nest_ent)
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return -EMSGSIZE;
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if (nla_put_nohdr(skb, sizeof(e), &e) ||
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nla_put_u32(skb,
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MDBA_MDB_EATTR_TIMER,
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br_timer_value(mtimer)))
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goto nest_err;
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switch (mp->addr.proto) {
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case htons(ETH_P_IP):
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dump_srcs_mode = !!(mp->br->multicast_igmp_version == 3);
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if (mp->addr.src.ip4) {
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if (nla_put_in_addr(skb, MDBA_MDB_EATTR_SOURCE,
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mp->addr.src.ip4))
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goto nest_err;
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break;
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}
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case htons(ETH_P_IPV6):
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dump_srcs_mode = !!(mp->br->multicast_mld_version == 2);
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if (!ipv6_addr_any(&mp->addr.src.ip6)) {
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if (nla_put_in6_addr(skb, MDBA_MDB_EATTR_SOURCE,
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&mp->addr.src.ip6))
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goto nest_err;
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break;
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}
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break;
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#endif
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default:
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ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
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}
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if (p) {
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if (nla_put_u8(skb, MDBA_MDB_EATTR_RTPROT, p->rt_protocol))
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goto nest_err;
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if (dump_srcs_mode &&
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(__mdb_fill_srcs(skb, p) ||
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nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE,
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p->filter_mode)))
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goto nest_err;
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}
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nla_nest_end(skb, nest_ent);
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return 0;
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nest_err:
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nla_nest_cancel(skb, nest_ent);
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return -EMSGSIZE;
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}
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static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
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struct net_device *dev)
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{
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int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2];
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_mdb_entry *mp;
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struct nlattr *nest, *nest2;
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if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
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return 0;
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nest = nla_nest_start_noflag(skb, MDBA_MDB);
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if (nest == NULL)
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return -EMSGSIZE;
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hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) {
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struct net_bridge_port_group *p;
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struct net_bridge_port_group __rcu **pp;
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if (idx < s_idx)
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goto skip;
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nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
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if (!nest2) {
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err = -EMSGSIZE;
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break;
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}
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if (!s_pidx && mp->host_joined) {
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err = __mdb_fill_info(skb, mp, NULL);
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if (err) {
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nla_nest_cancel(skb, nest2);
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break;
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}
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}
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for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL;
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pp = &p->next) {
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if (!p->key.port)
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continue;
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if (pidx < s_pidx)
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goto skip_pg;
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err = __mdb_fill_info(skb, mp, p);
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if (err) {
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nla_nest_end(skb, nest2);
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goto out;
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}
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skip_pg:
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pidx++;
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}
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pidx = 0;
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s_pidx = 0;
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nla_nest_end(skb, nest2);
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skip:
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idx++;
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}
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out:
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cb->args[1] = idx;
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cb->args[2] = pidx;
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nla_nest_end(skb, nest);
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return err;
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}
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static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack)
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{
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struct br_port_msg *bpm;
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if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request");
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return -EINVAL;
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}
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bpm = nlmsg_data(nlh);
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if (bpm->ifindex) {
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NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request");
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return -EINVAL;
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}
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if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
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NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
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return -EINVAL;
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}
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return 0;
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}
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static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct net_device *dev;
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struct net *net = sock_net(skb->sk);
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struct nlmsghdr *nlh = NULL;
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int idx = 0, s_idx;
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if (cb->strict_check) {
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int err = br_mdb_valid_dump_req(cb->nlh, cb->extack);
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if (err < 0)
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return err;
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}
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s_idx = cb->args[0];
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rcu_read_lock();
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cb->seq = net->dev_base_seq;
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for_each_netdev_rcu(net, dev) {
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if (dev->priv_flags & IFF_EBRIDGE) {
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struct br_port_msg *bpm;
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if (idx < s_idx)
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goto skip;
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nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, RTM_GETMDB,
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sizeof(*bpm), NLM_F_MULTI);
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if (nlh == NULL)
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break;
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bpm = nlmsg_data(nlh);
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memset(bpm, 0, sizeof(*bpm));
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bpm->ifindex = dev->ifindex;
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if (br_mdb_fill_info(skb, cb, dev) < 0)
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goto out;
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if (br_rports_fill_info(skb, cb, dev) < 0)
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goto out;
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cb->args[1] = 0;
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nlmsg_end(skb, nlh);
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skip:
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idx++;
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}
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}
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out:
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if (nlh)
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nlmsg_end(skb, nlh);
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rcu_read_unlock();
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cb->args[0] = idx;
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return skb->len;
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}
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static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
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struct net_device *dev,
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struct net_bridge_mdb_entry *mp,
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struct net_bridge_port_group *pg,
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int type)
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{
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struct nlmsghdr *nlh;
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struct br_port_msg *bpm;
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struct nlattr *nest, *nest2;
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nlh = nlmsg_put(skb, 0, 0, type, sizeof(*bpm), 0);
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if (!nlh)
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return -EMSGSIZE;
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bpm = nlmsg_data(nlh);
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memset(bpm, 0, sizeof(*bpm));
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bpm->family = AF_BRIDGE;
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bpm->ifindex = dev->ifindex;
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nest = nla_nest_start_noflag(skb, MDBA_MDB);
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if (nest == NULL)
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goto cancel;
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nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
|
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if (nest2 == NULL)
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goto end;
|
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|
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if (__mdb_fill_info(skb, mp, pg))
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goto end;
|
|
|
|
nla_nest_end(skb, nest2);
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nla_nest_end(skb, nest);
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nlmsg_end(skb, nlh);
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return 0;
|
|
|
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end:
|
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nla_nest_end(skb, nest);
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cancel:
|
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
|
|
|
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static size_t rtnl_mdb_nlmsg_size(struct net_bridge_port_group *pg)
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{
|
|
size_t nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
|
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nla_total_size(sizeof(struct br_mdb_entry)) +
|
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nla_total_size(sizeof(u32));
|
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struct net_bridge_group_src *ent;
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size_t addr_size = 0;
|
|
|
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if (!pg)
|
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goto out;
|
|
|
|
/* MDBA_MDB_EATTR_RTPROT */
|
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nlmsg_size += nla_total_size(sizeof(u8));
|
|
|
|
switch (pg->key.addr.proto) {
|
|
case htons(ETH_P_IP):
|
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/* MDBA_MDB_EATTR_SOURCE */
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|
if (pg->key.addr.src.ip4)
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|
nlmsg_size += nla_total_size(sizeof(__be32));
|
|
if (pg->key.port->br->multicast_igmp_version == 2)
|
|
goto out;
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|
addr_size = sizeof(__be32);
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|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
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|
case htons(ETH_P_IPV6):
|
|
/* MDBA_MDB_EATTR_SOURCE */
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|
if (!ipv6_addr_any(&pg->key.addr.src.ip6))
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nlmsg_size += nla_total_size(sizeof(struct in6_addr));
|
|
if (pg->key.port->br->multicast_mld_version == 1)
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goto out;
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|
addr_size = sizeof(struct in6_addr);
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|
break;
|
|
#endif
|
|
}
|
|
|
|
/* MDBA_MDB_EATTR_GROUP_MODE */
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nlmsg_size += nla_total_size(sizeof(u8));
|
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|
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/* MDBA_MDB_EATTR_SRC_LIST nested attr */
|
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if (!hlist_empty(&pg->src_list))
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nlmsg_size += nla_total_size(0);
|
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|
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hlist_for_each_entry(ent, &pg->src_list, node) {
|
|
/* MDBA_MDB_SRCLIST_ENTRY nested attr +
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* MDBA_MDB_SRCATTR_ADDRESS + MDBA_MDB_SRCATTR_TIMER
|
|
*/
|
|
nlmsg_size += nla_total_size(0) +
|
|
nla_total_size(addr_size) +
|
|
nla_total_size(sizeof(u32));
|
|
}
|
|
out:
|
|
return nlmsg_size;
|
|
}
|
|
|
|
struct br_mdb_complete_info {
|
|
struct net_bridge_port *port;
|
|
struct br_ip ip;
|
|
};
|
|
|
|
static void br_mdb_complete(struct net_device *dev, int err, void *priv)
|
|
{
|
|
struct br_mdb_complete_info *data = priv;
|
|
struct net_bridge_port_group __rcu **pp;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct net_bridge_port *port = data->port;
|
|
struct net_bridge *br = port->br;
|
|
|
|
if (err)
|
|
goto err;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
mp = br_mdb_ip_get(br, &data->ip);
|
|
if (!mp)
|
|
goto out;
|
|
for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
|
|
pp = &p->next) {
|
|
if (p->key.port != port)
|
|
continue;
|
|
p->flags |= MDB_PG_FLAGS_OFFLOAD;
|
|
}
|
|
out:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
err:
|
|
kfree(priv);
|
|
}
|
|
|
|
static void br_mdb_switchdev_host_port(struct net_device *dev,
|
|
struct net_device *lower_dev,
|
|
struct net_bridge_mdb_entry *mp,
|
|
int type)
|
|
{
|
|
struct switchdev_obj_port_mdb mdb = {
|
|
.obj = {
|
|
.id = SWITCHDEV_OBJ_ID_HOST_MDB,
|
|
.flags = SWITCHDEV_F_DEFER,
|
|
},
|
|
.vid = mp->addr.vid,
|
|
};
|
|
|
|
if (mp->addr.proto == htons(ETH_P_IP))
|
|
ip_eth_mc_map(mp->addr.dst.ip4, mdb.addr);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else
|
|
ipv6_eth_mc_map(&mp->addr.dst.ip6, mdb.addr);
|
|
#endif
|
|
|
|
mdb.obj.orig_dev = dev;
|
|
switch (type) {
|
|
case RTM_NEWMDB:
|
|
switchdev_port_obj_add(lower_dev, &mdb.obj, NULL);
|
|
break;
|
|
case RTM_DELMDB:
|
|
switchdev_port_obj_del(lower_dev, &mdb.obj);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void br_mdb_switchdev_host(struct net_device *dev,
|
|
struct net_bridge_mdb_entry *mp, int type)
|
|
{
|
|
struct net_device *lower_dev;
|
|
struct list_head *iter;
|
|
|
|
netdev_for_each_lower_dev(dev, lower_dev, iter)
|
|
br_mdb_switchdev_host_port(dev, lower_dev, mp, type);
|
|
}
|
|
|
|
void br_mdb_notify(struct net_device *dev,
|
|
struct net_bridge_mdb_entry *mp,
|
|
struct net_bridge_port_group *pg,
|
|
int type)
|
|
{
|
|
struct br_mdb_complete_info *complete_info;
|
|
struct switchdev_obj_port_mdb mdb = {
|
|
.obj = {
|
|
.id = SWITCHDEV_OBJ_ID_PORT_MDB,
|
|
.flags = SWITCHDEV_F_DEFER,
|
|
},
|
|
.vid = mp->addr.vid,
|
|
};
|
|
struct net *net = dev_net(dev);
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
if (pg) {
|
|
if (mp->addr.proto == htons(ETH_P_IP))
|
|
ip_eth_mc_map(mp->addr.dst.ip4, mdb.addr);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else if (mp->addr.proto == htons(ETH_P_IPV6))
|
|
ipv6_eth_mc_map(&mp->addr.dst.ip6, mdb.addr);
|
|
#endif
|
|
else
|
|
ether_addr_copy(mdb.addr, mp->addr.dst.mac_addr);
|
|
|
|
mdb.obj.orig_dev = pg->key.port->dev;
|
|
switch (type) {
|
|
case RTM_NEWMDB:
|
|
complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
|
|
if (!complete_info)
|
|
break;
|
|
complete_info->port = pg->key.port;
|
|
complete_info->ip = mp->addr;
|
|
mdb.obj.complete_priv = complete_info;
|
|
mdb.obj.complete = br_mdb_complete;
|
|
if (switchdev_port_obj_add(pg->key.port->dev, &mdb.obj, NULL))
|
|
kfree(complete_info);
|
|
break;
|
|
case RTM_DELMDB:
|
|
switchdev_port_obj_del(pg->key.port->dev, &mdb.obj);
|
|
break;
|
|
}
|
|
} else {
|
|
br_mdb_switchdev_host(dev, mp, type);
|
|
}
|
|
|
|
skb = nlmsg_new(rtnl_mdb_nlmsg_size(pg), GFP_ATOMIC);
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = nlmsg_populate_mdb_fill(skb, dev, mp, pg, type);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
|
|
rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
|
|
return;
|
|
errout:
|
|
rtnl_set_sk_err(net, RTNLGRP_MDB, err);
|
|
}
|
|
|
|
static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
|
|
struct net_device *dev,
|
|
int ifindex, u32 pid,
|
|
u32 seq, int type, unsigned int flags)
|
|
{
|
|
struct br_port_msg *bpm;
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *nest;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
bpm = nlmsg_data(nlh);
|
|
memset(bpm, 0, sizeof(*bpm));
|
|
bpm->family = AF_BRIDGE;
|
|
bpm->ifindex = dev->ifindex;
|
|
nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
|
|
if (!nest)
|
|
goto cancel;
|
|
|
|
if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
|
|
goto end;
|
|
|
|
nla_nest_end(skb, nest);
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
end:
|
|
nla_nest_end(skb, nest);
|
|
cancel:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static inline size_t rtnl_rtr_nlmsg_size(void)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct br_port_msg))
|
|
+ nla_total_size(sizeof(__u32));
|
|
}
|
|
|
|
void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
|
|
int type)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
int ifindex;
|
|
|
|
ifindex = port ? port->dev->ifindex : 0;
|
|
skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
|
|
rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
|
|
return;
|
|
|
|
errout:
|
|
rtnl_set_sk_err(net, RTNLGRP_MDB, err);
|
|
}
|
|
|
|
static bool is_valid_mdb_entry(struct br_mdb_entry *entry,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (entry->ifindex == 0) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Zero entry ifindex is not allowed");
|
|
return false;
|
|
}
|
|
|
|
if (entry->addr.proto == htons(ETH_P_IP)) {
|
|
if (!ipv4_is_multicast(entry->addr.u.ip4)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is not multicast");
|
|
return false;
|
|
}
|
|
if (ipv4_is_local_multicast(entry->addr.u.ip4)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is local multicast");
|
|
return false;
|
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
|
|
if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "IPv6 entry group address is link-local all nodes");
|
|
return false;
|
|
}
|
|
#endif
|
|
} else if (entry->addr.proto == 0) {
|
|
/* L2 mdb */
|
|
if (!is_multicast_ether_addr(entry->addr.u.mac_addr)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "L2 entry group is not multicast");
|
|
return false;
|
|
}
|
|
} else {
|
|
NL_SET_ERR_MSG_MOD(extack, "Unknown entry protocol");
|
|
return false;
|
|
}
|
|
|
|
if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Unknown entry state");
|
|
return false;
|
|
}
|
|
if (entry->vid >= VLAN_VID_MASK) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Invalid entry VLAN id");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool is_valid_mdb_source(struct nlattr *attr, __be16 proto,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
switch (proto) {
|
|
case htons(ETH_P_IP):
|
|
if (nla_len(attr) != sizeof(struct in_addr)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "IPv4 invalid source address length");
|
|
return false;
|
|
}
|
|
if (ipv4_is_multicast(nla_get_in_addr(attr))) {
|
|
NL_SET_ERR_MSG_MOD(extack, "IPv4 multicast source address is not allowed");
|
|
return false;
|
|
}
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case htons(ETH_P_IPV6): {
|
|
struct in6_addr src;
|
|
|
|
if (nla_len(attr) != sizeof(struct in6_addr)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "IPv6 invalid source address length");
|
|
return false;
|
|
}
|
|
src = nla_get_in6_addr(attr);
|
|
if (ipv6_addr_is_multicast(&src)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "IPv6 multicast source address is not allowed");
|
|
return false;
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
NL_SET_ERR_MSG_MOD(extack, "Invalid protocol used with source address");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = {
|
|
[MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
|
|
sizeof(struct in_addr),
|
|
sizeof(struct in6_addr)),
|
|
};
|
|
|
|
static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct net_device **pdev, struct br_mdb_entry **pentry,
|
|
struct nlattr **mdb_attrs, struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct br_mdb_entry *entry;
|
|
struct br_port_msg *bpm;
|
|
struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb,
|
|
MDBA_SET_ENTRY_MAX, NULL, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
bpm = nlmsg_data(nlh);
|
|
if (bpm->ifindex == 0) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Invalid bridge ifindex");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev = __dev_get_by_index(net, bpm->ifindex);
|
|
if (dev == NULL) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Bridge device doesn't exist");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!(dev->priv_flags & IFF_EBRIDGE)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
*pdev = dev;
|
|
|
|
if (!tb[MDBA_SET_ENTRY]) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Missing MDBA_SET_ENTRY attribute");
|
|
return -EINVAL;
|
|
}
|
|
if (nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Invalid MDBA_SET_ENTRY attribute length");
|
|
return -EINVAL;
|
|
}
|
|
|
|
entry = nla_data(tb[MDBA_SET_ENTRY]);
|
|
if (!is_valid_mdb_entry(entry, extack))
|
|
return -EINVAL;
|
|
*pentry = entry;
|
|
|
|
if (tb[MDBA_SET_ENTRY_ATTRS]) {
|
|
err = nla_parse_nested(mdb_attrs, MDBE_ATTR_MAX,
|
|
tb[MDBA_SET_ENTRY_ATTRS],
|
|
br_mdbe_attrs_pol, extack);
|
|
if (err)
|
|
return err;
|
|
if (mdb_attrs[MDBE_ATTR_SOURCE] &&
|
|
!is_valid_mdb_source(mdb_attrs[MDBE_ATTR_SOURCE],
|
|
entry->addr.proto, extack))
|
|
return -EINVAL;
|
|
} else {
|
|
memset(mdb_attrs, 0,
|
|
sizeof(struct nlattr *) * (MDBE_ATTR_MAX + 1));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
|
|
struct br_mdb_entry *entry,
|
|
struct nlattr **mdb_attrs,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net_bridge_mdb_entry *mp, *star_mp;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_port_group __rcu **pp;
|
|
struct br_ip group, star_group;
|
|
unsigned long now = jiffies;
|
|
unsigned char flags = 0;
|
|
u8 filter_mode;
|
|
int err;
|
|
|
|
__mdb_entry_to_br_ip(entry, &group, mdb_attrs);
|
|
|
|
/* host join errors which can happen before creating the group */
|
|
if (!port) {
|
|
/* don't allow any flags for host-joined groups */
|
|
if (entry->state) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups");
|
|
return -EINVAL;
|
|
}
|
|
if (!br_multicast_is_star_g(&group)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (br_group_is_l2(&group) && entry->state != MDB_PERMANENT) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mp = br_mdb_ip_get(br, &group);
|
|
if (!mp) {
|
|
mp = br_multicast_new_group(br, &group);
|
|
err = PTR_ERR_OR_ZERO(mp);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* host join */
|
|
if (!port) {
|
|
if (mp->host_joined) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Group is already joined by host");
|
|
return -EEXIST;
|
|
}
|
|
|
|
br_multicast_host_join(mp, false);
|
|
br_mdb_notify(br->dev, mp, NULL, RTM_NEWMDB);
|
|
|
|
return 0;
|
|
}
|
|
|
|
for (pp = &mp->ports;
|
|
(p = mlock_dereference(*pp, br)) != NULL;
|
|
pp = &p->next) {
|
|
if (p->key.port == port) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Group is already joined by port");
|
|
return -EEXIST;
|
|
}
|
|
if ((unsigned long)p->key.port < (unsigned long)port)
|
|
break;
|
|
}
|
|
|
|
filter_mode = br_multicast_is_star_g(&group) ? MCAST_EXCLUDE :
|
|
MCAST_INCLUDE;
|
|
|
|
if (entry->state == MDB_PERMANENT)
|
|
flags |= MDB_PG_FLAGS_PERMANENT;
|
|
|
|
p = br_multicast_new_port_group(port, &group, *pp, flags, NULL,
|
|
filter_mode, RTPROT_STATIC);
|
|
if (unlikely(!p)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group");
|
|
return -ENOMEM;
|
|
}
|
|
rcu_assign_pointer(*pp, p);
|
|
if (entry->state == MDB_TEMPORARY)
|
|
mod_timer(&p->timer, now + br->multicast_membership_interval);
|
|
br_mdb_notify(br->dev, mp, p, RTM_NEWMDB);
|
|
/* if we are adding a new EXCLUDE port group (*,G) it needs to be also
|
|
* added to all S,G entries for proper replication, if we are adding
|
|
* a new INCLUDE port (S,G) then all of *,G EXCLUDE ports need to be
|
|
* added to it for proper replication
|
|
*/
|
|
if (br_multicast_should_handle_mode(br, group.proto)) {
|
|
switch (filter_mode) {
|
|
case MCAST_EXCLUDE:
|
|
br_multicast_star_g_handle_mode(p, MCAST_EXCLUDE);
|
|
break;
|
|
case MCAST_INCLUDE:
|
|
star_group = p->key.addr;
|
|
memset(&star_group.src, 0, sizeof(star_group.src));
|
|
star_mp = br_mdb_ip_get(br, &star_group);
|
|
if (star_mp)
|
|
br_multicast_sg_add_exclude_ports(star_mp, p);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __br_mdb_add(struct net *net, struct net_bridge *br,
|
|
struct net_bridge_port *p,
|
|
struct br_mdb_entry *entry,
|
|
struct nlattr **mdb_attrs,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
ret = br_mdb_add_group(br, p, entry, mdb_attrs, extack);
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
struct net_bridge_vlan_group *vg;
|
|
struct net_bridge_port *p = NULL;
|
|
struct net_device *dev, *pdev;
|
|
struct br_mdb_entry *entry;
|
|
struct net_bridge_vlan *v;
|
|
struct net_bridge *br;
|
|
int err;
|
|
|
|
err = br_mdb_parse(skb, nlh, &dev, &entry, mdb_attrs, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
br = netdev_priv(dev);
|
|
|
|
if (!netif_running(br->dev)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Bridge device is not running");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Bridge's multicast processing is disabled");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (entry->ifindex != br->dev->ifindex) {
|
|
pdev = __dev_get_by_index(net, entry->ifindex);
|
|
if (!pdev) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Port net device doesn't exist");
|
|
return -ENODEV;
|
|
}
|
|
|
|
p = br_port_get_rtnl(pdev);
|
|
if (!p) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Net device is not a bridge port");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (p->br != br) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device");
|
|
return -EINVAL;
|
|
}
|
|
if (p->state == BR_STATE_DISABLED) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state");
|
|
return -EINVAL;
|
|
}
|
|
vg = nbp_vlan_group(p);
|
|
} else {
|
|
vg = br_vlan_group(br);
|
|
}
|
|
|
|
/* If vlan filtering is enabled and VLAN is not specified
|
|
* install mdb entry on all vlans configured on the port.
|
|
*/
|
|
if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
entry->vid = v->vid;
|
|
err = __br_mdb_add(net, br, p, entry, mdb_attrs, extack);
|
|
if (err)
|
|
break;
|
|
}
|
|
} else {
|
|
err = __br_mdb_add(net, br, p, entry, mdb_attrs, extack);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry,
|
|
struct nlattr **mdb_attrs)
|
|
{
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_port_group __rcu **pp;
|
|
struct br_ip ip;
|
|
int err = -EINVAL;
|
|
|
|
if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
|
|
return -EINVAL;
|
|
|
|
__mdb_entry_to_br_ip(entry, &ip, mdb_attrs);
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
mp = br_mdb_ip_get(br, &ip);
|
|
if (!mp)
|
|
goto unlock;
|
|
|
|
/* host leave */
|
|
if (entry->ifindex == mp->br->dev->ifindex && mp->host_joined) {
|
|
br_multicast_host_leave(mp, false);
|
|
err = 0;
|
|
br_mdb_notify(br->dev, mp, NULL, RTM_DELMDB);
|
|
if (!mp->ports && netif_running(br->dev))
|
|
mod_timer(&mp->timer, jiffies);
|
|
goto unlock;
|
|
}
|
|
|
|
for (pp = &mp->ports;
|
|
(p = mlock_dereference(*pp, br)) != NULL;
|
|
pp = &p->next) {
|
|
if (!p->key.port || p->key.port->dev->ifindex != entry->ifindex)
|
|
continue;
|
|
|
|
if (p->key.port->state == BR_STATE_DISABLED)
|
|
goto unlock;
|
|
|
|
br_multicast_del_pg(mp, p, pp);
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
return err;
|
|
}
|
|
|
|
static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
struct net_bridge_vlan_group *vg;
|
|
struct net_bridge_port *p = NULL;
|
|
struct net_device *dev, *pdev;
|
|
struct br_mdb_entry *entry;
|
|
struct net_bridge_vlan *v;
|
|
struct net_bridge *br;
|
|
int err;
|
|
|
|
err = br_mdb_parse(skb, nlh, &dev, &entry, mdb_attrs, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
br = netdev_priv(dev);
|
|
|
|
if (entry->ifindex != br->dev->ifindex) {
|
|
pdev = __dev_get_by_index(net, entry->ifindex);
|
|
if (!pdev)
|
|
return -ENODEV;
|
|
|
|
p = br_port_get_rtnl(pdev);
|
|
if (!p || p->br != br || p->state == BR_STATE_DISABLED)
|
|
return -EINVAL;
|
|
vg = nbp_vlan_group(p);
|
|
} else {
|
|
vg = br_vlan_group(br);
|
|
}
|
|
|
|
/* If vlan filtering is enabled and VLAN is not specified
|
|
* delete mdb entry on all vlans configured on the port.
|
|
*/
|
|
if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
|
|
list_for_each_entry(v, &vg->vlan_list, vlist) {
|
|
entry->vid = v->vid;
|
|
err = __br_mdb_del(br, entry, mdb_attrs);
|
|
}
|
|
} else {
|
|
err = __br_mdb_del(br, entry, mdb_attrs);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
void br_mdb_init(void)
|
|
{
|
|
rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
|
|
rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
|
|
rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
|
|
}
|
|
|
|
void br_mdb_uninit(void)
|
|
{
|
|
rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
|
|
rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
|
|
rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
|
|
}
|