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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/bridge/br_mdb.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/bridge/br_mdb.c')
-rw-r--r--net/bridge/br_mdb.c1164
1 files changed, 1164 insertions, 0 deletions
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
new file mode 100644
index 000000000..589ff497d
--- /dev/null
+++ b/net/bridge/br_mdb.c
@@ -0,0 +1,1164 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/err.h>
+#include <linux/igmp.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/rculist.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+#include <net/ip.h>
+#include <net/netlink.h>
+#include <net/switchdev.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/addrconf.h>
+#endif
+
+#include "br_private.h"
+
+static bool
+br_ip4_rports_get_timer(struct net_bridge_mcast_port *pmctx,
+ unsigned long *timer)
+{
+ *timer = br_timer_value(&pmctx->ip4_mc_router_timer);
+ return !hlist_unhashed(&pmctx->ip4_rlist);
+}
+
+static bool
+br_ip6_rports_get_timer(struct net_bridge_mcast_port *pmctx,
+ unsigned long *timer)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ *timer = br_timer_value(&pmctx->ip6_mc_router_timer);
+ return !hlist_unhashed(&pmctx->ip6_rlist);
+#else
+ *timer = 0;
+ return false;
+#endif
+}
+
+static size_t __br_rports_one_size(void)
+{
+ return nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PORT */
+ nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_TIMER */
+ nla_total_size(sizeof(u8)) + /* MDBA_ROUTER_PATTR_TYPE */
+ nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET_TIMER */
+ nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET6_TIMER */
+ nla_total_size(sizeof(u32)); /* MDBA_ROUTER_PATTR_VID */
+}
+
+size_t br_rports_size(const struct net_bridge_mcast *brmctx)
+{
+ struct net_bridge_mcast_port *pmctx;
+ size_t size = nla_total_size(0); /* MDBA_ROUTER */
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list,
+ ip4_rlist)
+ size += __br_rports_one_size();
+
+#if IS_ENABLED(CONFIG_IPV6)
+ hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list,
+ ip6_rlist)
+ size += __br_rports_one_size();
+#endif
+ rcu_read_unlock();
+
+ return size;
+}
+
+int br_rports_fill_info(struct sk_buff *skb,
+ const struct net_bridge_mcast *brmctx)
+{
+ u16 vid = brmctx->vlan ? brmctx->vlan->vid : 0;
+ bool have_ip4_mc_rtr, have_ip6_mc_rtr;
+ unsigned long ip4_timer, ip6_timer;
+ struct nlattr *nest, *port_nest;
+ struct net_bridge_port *p;
+
+ if (!brmctx->multicast_router || !br_rports_have_mc_router(brmctx))
+ return 0;
+
+ nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
+ if (nest == NULL)
+ return -EMSGSIZE;
+
+ list_for_each_entry_rcu(p, &brmctx->br->port_list, list) {
+ struct net_bridge_mcast_port *pmctx;
+
+ if (vid) {
+ struct net_bridge_vlan *v;
+
+ v = br_vlan_find(nbp_vlan_group(p), vid);
+ if (!v)
+ continue;
+ pmctx = &v->port_mcast_ctx;
+ } else {
+ pmctx = &p->multicast_ctx;
+ }
+
+ have_ip4_mc_rtr = br_ip4_rports_get_timer(pmctx, &ip4_timer);
+ have_ip6_mc_rtr = br_ip6_rports_get_timer(pmctx, &ip6_timer);
+
+ if (!have_ip4_mc_rtr && !have_ip6_mc_rtr)
+ continue;
+
+ port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
+ if (!port_nest)
+ goto fail;
+
+ if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
+ nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
+ max(ip4_timer, ip6_timer)) ||
+ nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
+ p->multicast_ctx.multicast_router) ||
+ (have_ip4_mc_rtr &&
+ nla_put_u32(skb, MDBA_ROUTER_PATTR_INET_TIMER,
+ ip4_timer)) ||
+ (have_ip6_mc_rtr &&
+ nla_put_u32(skb, MDBA_ROUTER_PATTR_INET6_TIMER,
+ ip6_timer)) ||
+ (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid))) {
+ nla_nest_cancel(skb, port_nest);
+ goto fail;
+ }
+ nla_nest_end(skb, port_nest);
+ }
+
+ nla_nest_end(skb, nest);
+ return 0;
+fail:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
+static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
+{
+ e->state = flags & MDB_PG_FLAGS_PERMANENT;
+ e->flags = 0;
+ if (flags & MDB_PG_FLAGS_OFFLOAD)
+ e->flags |= MDB_FLAGS_OFFLOAD;
+ if (flags & MDB_PG_FLAGS_FAST_LEAVE)
+ e->flags |= MDB_FLAGS_FAST_LEAVE;
+ if (flags & MDB_PG_FLAGS_STAR_EXCL)
+ e->flags |= MDB_FLAGS_STAR_EXCL;
+ if (flags & MDB_PG_FLAGS_BLOCKED)
+ e->flags |= MDB_FLAGS_BLOCKED;
+}
+
+static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip,
+ struct nlattr **mdb_attrs)
+{
+ memset(ip, 0, sizeof(struct br_ip));
+ ip->vid = entry->vid;
+ ip->proto = entry->addr.proto;
+ switch (ip->proto) {
+ case htons(ETH_P_IP):
+ ip->dst.ip4 = entry->addr.u.ip4;
+ if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
+ ip->src.ip4 = nla_get_in_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ ip->dst.ip6 = entry->addr.u.ip6;
+ if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
+ ip->src.ip6 = nla_get_in6_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
+ break;
+#endif
+ default:
+ ether_addr_copy(ip->dst.mac_addr, entry->addr.u.mac_addr);
+ }
+
+}
+
+static int __mdb_fill_srcs(struct sk_buff *skb,
+ struct net_bridge_port_group *p)
+{
+ struct net_bridge_group_src *ent;
+ struct nlattr *nest, *nest_ent;
+
+ if (hlist_empty(&p->src_list))
+ return 0;
+
+ nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST);
+ if (!nest)
+ return -EMSGSIZE;
+
+ hlist_for_each_entry_rcu(ent, &p->src_list, node,
+ lockdep_is_held(&p->key.port->br->multicast_lock)) {
+ nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY);
+ if (!nest_ent)
+ goto out_cancel_err;
+ switch (ent->addr.proto) {
+ case htons(ETH_P_IP):
+ if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
+ ent->addr.src.ip4)) {
+ nla_nest_cancel(skb, nest_ent);
+ goto out_cancel_err;
+ }
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ if (nla_put_in6_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
+ &ent->addr.src.ip6)) {
+ nla_nest_cancel(skb, nest_ent);
+ goto out_cancel_err;
+ }
+ break;
+#endif
+ default:
+ nla_nest_cancel(skb, nest_ent);
+ continue;
+ }
+ if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER,
+ br_timer_value(&ent->timer))) {
+ nla_nest_cancel(skb, nest_ent);
+ goto out_cancel_err;
+ }
+ nla_nest_end(skb, nest_ent);
+ }
+
+ nla_nest_end(skb, nest);
+
+ return 0;
+
+out_cancel_err:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
+static int __mdb_fill_info(struct sk_buff *skb,
+ struct net_bridge_mdb_entry *mp,
+ struct net_bridge_port_group *p)
+{
+ bool dump_srcs_mode = false;
+ struct timer_list *mtimer;
+ struct nlattr *nest_ent;
+ struct br_mdb_entry e;
+ u8 flags = 0;
+ int ifindex;
+
+ memset(&e, 0, sizeof(e));
+ if (p) {
+ ifindex = p->key.port->dev->ifindex;
+ mtimer = &p->timer;
+ flags = p->flags;
+ } else {
+ ifindex = mp->br->dev->ifindex;
+ mtimer = &mp->timer;
+ }
+
+ __mdb_entry_fill_flags(&e, flags);
+ e.ifindex = ifindex;
+ e.vid = mp->addr.vid;
+ if (mp->addr.proto == htons(ETH_P_IP)) {
+ e.addr.u.ip4 = mp->addr.dst.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (mp->addr.proto == htons(ETH_P_IPV6)) {
+ e.addr.u.ip6 = mp->addr.dst.ip6;
+#endif
+ } else {
+ ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
+ e.state = MDB_PG_FLAGS_PERMANENT;
+ }
+ e.addr.proto = mp->addr.proto;
+ nest_ent = nla_nest_start_noflag(skb,
+ MDBA_MDB_ENTRY_INFO);
+ if (!nest_ent)
+ return -EMSGSIZE;
+
+ if (nla_put_nohdr(skb, sizeof(e), &e) ||
+ nla_put_u32(skb,
+ MDBA_MDB_EATTR_TIMER,
+ br_timer_value(mtimer)))
+ goto nest_err;
+
+ switch (mp->addr.proto) {
+ case htons(ETH_P_IP):
+ dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_igmp_version == 3);
+ if (mp->addr.src.ip4) {
+ if (nla_put_in_addr(skb, MDBA_MDB_EATTR_SOURCE,
+ mp->addr.src.ip4))
+ goto nest_err;
+ break;
+ }
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_mld_version == 2);
+ if (!ipv6_addr_any(&mp->addr.src.ip6)) {
+ if (nla_put_in6_addr(skb, MDBA_MDB_EATTR_SOURCE,
+ &mp->addr.src.ip6))
+ goto nest_err;
+ break;
+ }
+ break;
+#endif
+ default:
+ ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
+ }
+ if (p) {
+ if (nla_put_u8(skb, MDBA_MDB_EATTR_RTPROT, p->rt_protocol))
+ goto nest_err;
+ if (dump_srcs_mode &&
+ (__mdb_fill_srcs(skb, p) ||
+ nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE,
+ p->filter_mode)))
+ goto nest_err;
+ }
+ nla_nest_end(skb, nest_ent);
+
+ return 0;
+
+nest_err:
+ nla_nest_cancel(skb, nest_ent);
+ return -EMSGSIZE;
+}
+
+static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev)
+{
+ int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2];
+ struct net_bridge *br = netdev_priv(dev);
+ struct net_bridge_mdb_entry *mp;
+ struct nlattr *nest, *nest2;
+
+ if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
+ return 0;
+
+ nest = nla_nest_start_noflag(skb, MDBA_MDB);
+ if (nest == NULL)
+ return -EMSGSIZE;
+
+ hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) {
+ struct net_bridge_port_group *p;
+ struct net_bridge_port_group __rcu **pp;
+
+ if (idx < s_idx)
+ goto skip;
+
+ nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
+ if (!nest2) {
+ err = -EMSGSIZE;
+ break;
+ }
+
+ if (!s_pidx && mp->host_joined) {
+ err = __mdb_fill_info(skb, mp, NULL);
+ if (err) {
+ nla_nest_cancel(skb, nest2);
+ break;
+ }
+ }
+
+ for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL;
+ pp = &p->next) {
+ if (!p->key.port)
+ continue;
+ if (pidx < s_pidx)
+ goto skip_pg;
+
+ err = __mdb_fill_info(skb, mp, p);
+ if (err) {
+ nla_nest_end(skb, nest2);
+ goto out;
+ }
+skip_pg:
+ pidx++;
+ }
+ pidx = 0;
+ s_pidx = 0;
+ nla_nest_end(skb, nest2);
+skip:
+ idx++;
+ }
+
+out:
+ cb->args[1] = idx;
+ cb->args[2] = pidx;
+ nla_nest_end(skb, nest);
+ return err;
+}
+
+static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct br_port_msg *bpm;
+
+ if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
+ NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request");
+ return -EINVAL;
+ }
+
+ bpm = nlmsg_data(nlh);
+ if (bpm->ifindex) {
+ NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request");
+ return -EINVAL;
+ }
+ if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
+ NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net_device *dev;
+ struct net *net = sock_net(skb->sk);
+ struct nlmsghdr *nlh = NULL;
+ int idx = 0, s_idx;
+
+ if (cb->strict_check) {
+ int err = br_mdb_valid_dump_req(cb->nlh, cb->extack);
+
+ if (err < 0)
+ return err;
+ }
+
+ s_idx = cb->args[0];
+
+ rcu_read_lock();
+
+ cb->seq = net->dev_base_seq;
+
+ for_each_netdev_rcu(net, dev) {
+ if (netif_is_bridge_master(dev)) {
+ struct net_bridge *br = netdev_priv(dev);
+ struct br_port_msg *bpm;
+
+ if (idx < s_idx)
+ goto skip;
+
+ nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, RTM_GETMDB,
+ sizeof(*bpm), NLM_F_MULTI);
+ if (nlh == NULL)
+ break;
+
+ bpm = nlmsg_data(nlh);
+ memset(bpm, 0, sizeof(*bpm));
+ bpm->ifindex = dev->ifindex;
+ if (br_mdb_fill_info(skb, cb, dev) < 0)
+ goto out;
+ if (br_rports_fill_info(skb, &br->multicast_ctx) < 0)
+ goto out;
+
+ cb->args[1] = 0;
+ nlmsg_end(skb, nlh);
+ skip:
+ idx++;
+ }
+ }
+
+out:
+ if (nlh)
+ nlmsg_end(skb, nlh);
+ rcu_read_unlock();
+ cb->args[0] = idx;
+ return skb->len;
+}
+
+static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
+ struct net_device *dev,
+ struct net_bridge_mdb_entry *mp,
+ struct net_bridge_port_group *pg,
+ int type)
+{
+ struct nlmsghdr *nlh;
+ struct br_port_msg *bpm;
+ struct nlattr *nest, *nest2;
+
+ nlh = nlmsg_put(skb, 0, 0, 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_MDB);
+ if (nest == NULL)
+ goto cancel;
+ nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
+ if (nest2 == NULL)
+ goto end;
+
+ if (__mdb_fill_info(skb, mp, pg))
+ goto end;
+
+ nla_nest_end(skb, nest2);
+ 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 size_t rtnl_mdb_nlmsg_size(struct net_bridge_port_group *pg)
+{
+ size_t nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
+ nla_total_size(sizeof(struct br_mdb_entry)) +
+ nla_total_size(sizeof(u32));
+ struct net_bridge_group_src *ent;
+ size_t addr_size = 0;
+
+ if (!pg)
+ goto out;
+
+ /* MDBA_MDB_EATTR_RTPROT */
+ nlmsg_size += nla_total_size(sizeof(u8));
+
+ switch (pg->key.addr.proto) {
+ case htons(ETH_P_IP):
+ /* MDBA_MDB_EATTR_SOURCE */
+ if (pg->key.addr.src.ip4)
+ nlmsg_size += nla_total_size(sizeof(__be32));
+ if (pg->key.port->br->multicast_ctx.multicast_igmp_version == 2)
+ goto out;
+ addr_size = sizeof(__be32);
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ /* MDBA_MDB_EATTR_SOURCE */
+ if (!ipv6_addr_any(&pg->key.addr.src.ip6))
+ nlmsg_size += nla_total_size(sizeof(struct in6_addr));
+ if (pg->key.port->br->multicast_ctx.multicast_mld_version == 1)
+ goto out;
+ addr_size = sizeof(struct in6_addr);
+ break;
+#endif
+ }
+
+ /* MDBA_MDB_EATTR_GROUP_MODE */
+ nlmsg_size += nla_total_size(sizeof(u8));
+
+ /* MDBA_MDB_EATTR_SRC_LIST nested attr */
+ if (!hlist_empty(&pg->src_list))
+ nlmsg_size += nla_total_size(0);
+
+ hlist_for_each_entry(ent, &pg->src_list, node) {
+ /* MDBA_MDB_SRCLIST_ENTRY nested attr +
+ * 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;
+}
+
+void br_mdb_notify(struct net_device *dev,
+ struct net_bridge_mdb_entry *mp,
+ struct net_bridge_port_group *pg,
+ int type)
+{
+ struct net *net = dev_net(dev);
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ br_switchdev_mdb_notify(dev, mp, pg, 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, u16 vid, u32 pid,
+ u32 seq, int type, unsigned int flags)
+{
+ struct nlattr *nest, *port_nest;
+ struct br_port_msg *bpm;
+ struct nlmsghdr *nlh;
+
+ 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;
+
+ port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
+ if (!port_nest)
+ goto end;
+ if (nla_put_nohdr(skb, sizeof(u32), &ifindex)) {
+ nla_nest_cancel(skb, port_nest);
+ goto end;
+ }
+ if (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid)) {
+ nla_nest_cancel(skb, port_nest);
+ goto end;
+ }
+ nla_nest_end(skb, port_nest);
+
+ 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))
+ + nla_total_size(sizeof(u16));
+}
+
+void br_rtr_notify(struct net_device *dev, struct net_bridge_mcast_port *pmctx,
+ int type)
+{
+ struct net *net = dev_net(dev);
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+ int ifindex;
+ u16 vid;
+
+ ifindex = pmctx ? pmctx->port->dev->ifindex : 0;
+ vid = pmctx && br_multicast_port_ctx_is_vlan(pmctx) ? pmctx->vlan->vid :
+ 0;
+ skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = nlmsg_populate_rtr_fill(skb, dev, ifindex, vid, 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 (!netif_is_bridge_master(dev)) {
+ 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 struct net_bridge_mcast *
+__br_mdb_choose_context(struct net_bridge *br,
+ const struct br_mdb_entry *entry,
+ struct netlink_ext_ack *extack)
+{
+ struct net_bridge_mcast *brmctx = NULL;
+ struct net_bridge_vlan *v;
+
+ if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
+ brmctx = &br->multicast_ctx;
+ goto out;
+ }
+
+ if (!entry->vid) {
+ NL_SET_ERR_MSG_MOD(extack, "Cannot add an entry without a vlan when vlan snooping is enabled");
+ goto out;
+ }
+
+ v = br_vlan_find(br_vlan_group(br), entry->vid);
+ if (!v) {
+ NL_SET_ERR_MSG_MOD(extack, "Vlan is not configured");
+ goto out;
+ }
+ if (br_multicast_ctx_vlan_global_disabled(&v->br_mcast_ctx)) {
+ NL_SET_ERR_MSG_MOD(extack, "Vlan's multicast processing is disabled");
+ goto out;
+ }
+ brmctx = &v->br_mcast_ctx;
+out:
+ return brmctx;
+}
+
+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 __rcu **pp;
+ struct net_bridge_port_group *p;
+ struct net_bridge_mcast *brmctx;
+ 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);
+
+ brmctx = __br_mdb_choose_context(br, entry, extack);
+ if (!brmctx)
+ return -EINVAL;
+
+ /* host join errors which can happen before creating the group */
+ if (!port && !br_group_is_l2(&group)) {
+ /* don't allow any flags for host-joined IP 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(brmctx, 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 + brmctx->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(brmctx, 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 && entry->state != MDB_PERMANENT) {
+ NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state and entry is not permanent");
+ 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;
+
+ 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) {
+ 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;
+ }
+ 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);
+}