diff options
Diffstat (limited to 'net/bridge/br_mdb.c')
| -rw-r--r-- | net/bridge/br_mdb.c | 1114 |
1 files changed, 1114 insertions, 0 deletions
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c new file mode 100644 index 000000000..e15bab19a --- /dev/null +++ b/net/bridge/br_mdb.c @@ -0,0 +1,1114 @@ +// 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 int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb, + struct net_device *dev) +{ + struct net_bridge *br = netdev_priv(dev); + struct net_bridge_port *p; + struct nlattr *nest, *port_nest; + + if (!br->multicast_router || hlist_empty(&br->router_list)) + return 0; + + nest = nla_nest_start_noflag(skb, MDBA_ROUTER); + if (nest == NULL) + return -EMSGSIZE; + + hlist_for_each_entry_rcu(p, &br->router_list, rlist) { + if (!p) + 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, + br_timer_value(&p->multicast_router_timer)) || + nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE, + p->multicast_router)) { + 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 + } + +} + +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) + if (mp->addr.proto == htons(ETH_P_IPV6)) + e.addr.u.ip6 = mp->addr.dst.ip6; +#endif + 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_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_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 + } + 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 (dev->priv_flags & IFF_EBRIDGE) { + 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, cb, dev) < 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_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_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; +} + +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 + ipv6_eth_mc_map(&mp->addr.dst.ip6, mdb.addr); +#endif + 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 { + 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; + 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; + } + } + + 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; + + p = br_multicast_new_port_group(port, &group, *pp, entry->state, 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); +} |