// 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_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;
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;
}
int br_mdb_dump(struct net_device *dev, struct sk_buff *skb,
struct netlink_callback *cb)
{
struct net_bridge *br = netdev_priv(dev);
struct br_port_msg *bpm;
struct nlmsghdr *nlh;
int err;
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, RTM_GETMDB, sizeof(*bpm),
NLM_F_MULTI);
if (!nlh)
return -EMSGSIZE;
bpm = nlmsg_data(nlh);
memset(bpm, 0, sizeof(*bpm));
bpm->ifindex = dev->ifindex;
rcu_read_lock();
err = br_mdb_fill_info(skb, cb, dev);
if (err)
goto out;
err = br_rports_fill_info(skb, &br->multicast_ctx);
if (err)
goto out;
out:
rcu_read_unlock();
nlmsg_end(skb, nlh);
return err;
}
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_pg_size(const struct net_bridge_port_group *pg)
{
struct net_bridge_group_src *ent;
size_t nlmsg_size, addr_size = 0;
/* MDBA_MDB_ENTRY_INFO */
nlmsg_size = nla_total_size(sizeof(struct br_mdb_entry)) +
/* MDBA_MDB_EATTR_TIMER */
nla_total_size(sizeof(u32));
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;
}
static size_t rtnl_mdb_nlmsg_size(const struct net_bridge_port_group *pg)
{
return NLMSG_ALIGN(sizeof(struct br_port_msg)) +
/* MDBA_MDB */
nla_total_size(0) +
/* MDBA_MDB_ENTRY */
nla_total_size(0) +
/* Port group entry */
rtnl_mdb_nlmsg_pg_size(pg);
}
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 const struct nla_policy
br_mdbe_src_list_entry_pol[MDBE_SRCATTR_MAX + 1] = {
[MDBE_SRCATTR_ADDRESS] = NLA_POLICY_RANGE(NLA_BINARY,
sizeof(struct in_addr),
sizeof(struct in6_addr)),
};
static const struct nla_policy
br_mdbe_src_list_pol[MDBE_SRC_LIST_MAX + 1] = {
[MDBE_SRC_LIST_ENTRY] = NLA_POLICY_NESTED(br_mdbe_src_list_entry_pol),
};
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)),
[MDBE_ATTR_GROUP_MODE] = NLA_POLICY_RANGE(NLA_U8, MCAST_EXCLUDE,
MCAST_INCLUDE),
[MDBE_ATTR_SRC_LIST] = NLA_POLICY_NESTED(br_mdbe_src_list_pol),
[MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
};
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 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_replace_group_sg(const struct br_mdb_config *cfg,
struct net_bridge_mdb_entry *mp,
struct net_bridge_port_group *pg,
struct net_bridge_mcast *brmctx,
unsigned char flags)
{
unsigned long now = jiffies;
pg->flags = flags;
pg->rt_protocol = cfg->rt_protocol;
if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry)
mod_timer(&pg->timer,
now + brmctx->multicast_membership_interval);
else
del_timer(&pg->timer);
br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB);
return 0;
}
static int br_mdb_add_group_sg(const struct br_mdb_config *cfg,
struct net_bridge_mdb_entry *mp,
struct net_bridge_mcast *brmctx,
unsigned char flags,
struct netlink_ext_ack *extack)
{
struct net_bridge_port_group __rcu **pp;
struct net_bridge_port_group *p;
unsigned long now = jiffies;
for (pp = &mp->ports;
(p = mlock_dereference(*pp, cfg->br)) != NULL;
pp = &p->next) {
if (p->key.port == cfg->p) {
if (!(cfg->nlflags & NLM_F_REPLACE)) {
NL_SET_ERR_MSG_MOD(extack, "(S, G) group is already joined by port");
return -EEXIST;
}
return br_mdb_replace_group_sg(cfg, mp, p, brmctx,
flags);
}
if ((unsigned long)p->key.port < (unsigned long)cfg->p)
break;
}
p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
MCAST_INCLUDE, cfg->rt_protocol, extack);
if (unlikely(!p))
return -ENOMEM;
rcu_assign_pointer(*pp, p);
if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry)
mod_timer(&p->timer,
now + brmctx->multicast_membership_interval);
br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB);
/* All of (*, G) EXCLUDE ports need to be added to the new (S, G) for
* proper replication.
*/
if (br_multicast_should_handle_mode(brmctx, cfg->group.proto)) {
struct net_bridge_mdb_entry *star_mp;
struct br_ip star_group;
star_group = p->key.addr;
memset(&star_group.src, 0, sizeof(star_group.src));
star_mp = br_mdb_ip_get(cfg->br, &star_group);
if (star_mp)
br_multicast_sg_add_exclude_ports(star_mp, p);
}
return 0;
}
static int br_mdb_add_group_src_fwd(const struct br_mdb_config *cfg,
struct br_ip *src_ip,
struct net_bridge_mcast *brmctx,
struct netlink_ext_ack *extack)
{
struct net_bridge_mdb_entry *sgmp;
struct br_mdb_config sg_cfg;
struct br_ip sg_ip;
u8 flags = 0;
sg_ip = cfg->group;
sg_ip.src = src_ip->src;
sgmp = br_multicast_new_group(cfg->br, &sg_ip);
if (IS_ERR(sgmp)) {
NL_SET_ERR_MSG_MOD(extack, "Failed to add (S, G) MDB entry");
return PTR_ERR(sgmp);
}
if (cfg->entry->state == MDB_PERMANENT)
flags |= MDB_PG_FLAGS_PERMANENT;
if (cfg->filter_mode == MCAST_EXCLUDE)
flags |= MDB_PG_FLAGS_BLOCKED;
memset(&sg_cfg, 0, sizeof(sg_cfg));
sg_cfg.br = cfg->br;
sg_cfg.p = cfg->p;
sg_cfg.entry = cfg->entry;
sg_cfg.group = sg_ip;
sg_cfg.src_entry = true;
sg_cfg.filter_mode = MCAST_INCLUDE;
sg_cfg.rt_protocol = cfg->rt_protocol;
sg_cfg.nlflags = cfg->nlflags;
return br_mdb_add_group_sg(&sg_cfg, sgmp, brmctx, flags, extack);
}
static int br_mdb_add_group_src(const struct br_mdb_config *cfg,
struct net_bridge_port_group *pg,
struct net_bridge_mcast *brmctx,
struct br_mdb_src_entry *src,
struct netlink_ext_ack *extack)
{
struct net_bridge_group_src *ent;
unsigned long now = jiffies;
int err;
ent = br_multicast_find_group_src(pg, &src->addr);
if (!ent) {
ent = br_multicast_new_group_src(pg, &src->addr);
if (!ent) {
NL_SET_ERR_MSG_MOD(extack, "Failed to add new source entry");
return -ENOSPC;
}
} else if (!(cfg->nlflags & NLM_F_REPLACE)) {
NL_SET_ERR_MSG_MOD(extack, "Source entry already exists");
return -EEXIST;
}
if (cfg->filter_mode == MCAST_INCLUDE &&
cfg->entry->state == MDB_TEMPORARY)
mod_timer(&ent->timer, now + br_multicast_gmi(brmctx));
else
del_timer(&ent->timer);
/* Install a (S, G) forwarding entry for the source. */
err = br_mdb_add_group_src_fwd(cfg, &src->addr, brmctx, extack);
if (err)
goto err_del_sg;
ent->flags = BR_SGRP_F_INSTALLED | BR_SGRP_F_USER_ADDED;
return 0;
err_del_sg:
__br_multicast_del_group_src(ent);
return err;
}
static void br_mdb_del_group_src(struct net_bridge_port_group *pg,
struct br_mdb_src_entry *src)
{
struct net_bridge_group_src *ent;
ent = br_multicast_find_group_src(pg, &src->addr);
if (WARN_ON_ONCE(!ent))
return;
br_multicast_del_group_src(ent, false);
}
static int br_mdb_add_group_srcs(const struct br_mdb_config *cfg,
struct net_bridge_port_group *pg,
struct net_bridge_mcast *brmctx,
struct netlink_ext_ack *extack)
{
int i, err;
for (i = 0; i < cfg->num_src_entries; i++) {
err = br_mdb_add_group_src(cfg, pg, brmctx,
&cfg->src_entries[i], extack);
if (err)
goto err_del_group_srcs;
}
return 0;
err_del_group_srcs:
for (i--; i >= 0; i--)
br_mdb_del_group_src(pg, &cfg->src_entries[i]);
return err;
}
static int br_mdb_replace_group_srcs(const struct br_mdb_config *cfg,
struct net_bridge_port_group *pg,
struct net_bridge_mcast *brmctx,
struct netlink_ext_ack *extack)
{
struct net_bridge_group_src *ent;
struct hlist_node *tmp;
int err;
hlist_for_each_entry(ent, &pg->src_list, node)
ent->flags |= BR_SGRP_F_DELETE;
err = br_mdb_add_group_srcs(cfg, pg, brmctx, extack);
if (err)
goto err_clear_delete;
hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) {
if (ent->flags & BR_SGRP_F_DELETE)
br_multicast_del_group_src(ent, false);
}
return 0;
err_clear_delete:
hlist_for_each_entry(ent, &pg->src_list, node)
ent->flags &= ~BR_SGRP_F_DELETE;
return err;
}
static int br_mdb_replace_group_star_g(const struct br_mdb_config *cfg,
struct net_bridge_mdb_entry *mp,
struct net_bridge_port_group *pg,
struct net_bridge_mcast *brmctx,
unsigned char flags,
struct netlink_ext_ack *extack)
{
unsigned long now = jiffies;
int err;
err = br_mdb_replace_group_srcs(cfg, pg, brmctx, extack);
if (err)
return err;
pg->flags = flags;
pg->filter_mode = cfg->filter_mode;
pg->rt_protocol = cfg->rt_protocol;
if (!(flags & MDB_PG_FLAGS_PERMANENT) &&
cfg->filter_mode == MCAST_EXCLUDE)
mod_timer(&pg->timer,
now + brmctx->multicast_membership_interval);
else
del_timer(&pg->timer);
br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB);
if (br_multicast_should_handle_mode(brmctx, cfg->group.proto))
br_multicast_star_g_handle_mode(pg, cfg->filter_mode);
return 0;
}
static int br_mdb_add_group_star_g(const struct br_mdb_config *cfg,
struct net_bridge_mdb_entry *mp,
struct net_bridge_mcast *brmctx,
unsigned char flags,
struct netlink_ext_ack *extack)
{
struct net_bridge_port_group __rcu **pp;
struct net_bridge_port_group *p;
unsigned long now = jiffies;
int err;
for (pp = &mp->ports;
(p = mlock_dereference(*pp, cfg->br)) != NULL;
pp = &p->next) {
if (p->key.port == cfg->p) {
if (!(cfg->nlflags & NLM_F_REPLACE)) {
NL_SET_ERR_MSG_MOD(extack, "(*, G) group is already joined by port");
return -EEXIST;
}
return br_mdb_replace_group_star_g(cfg, mp, p, brmctx,
flags, extack);
}
if ((unsigned long)p->key.port < (unsigned long)cfg->p)
break;
}
p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
cfg->filter_mode, cfg->rt_protocol,
extack);
if (unlikely(!p))
return -ENOMEM;
err = br_mdb_add_group_srcs(cfg, p, brmctx, extack);
if (err)
goto err_del_port_group;
rcu_assign_pointer(*pp, p);
if (!(flags & MDB_PG_FLAGS_PERMANENT) &&
cfg->filter_mode == MCAST_EXCLUDE)
mod_timer(&p->timer,
now + brmctx->multicast_membership_interval);
br_mdb_notify(cfg->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 (br_multicast_should_handle_mode(brmctx, cfg->group.proto) &&
cfg->filter_mode == MCAST_EXCLUDE)
br_multicast_star_g_handle_mode(p, MCAST_EXCLUDE);
return 0;
err_del_port_group:
br_multicast_del_port_group(p);
return err;
}
static int br_mdb_add_group(const struct br_mdb_config *cfg,
struct netlink_ext_ack *extack)
{
struct br_mdb_entry *entry = cfg->entry;
struct net_bridge_port *port = cfg->p;
struct net_bridge_mdb_entry *mp;
struct net_bridge *br = cfg->br;
struct net_bridge_mcast *brmctx;
struct br_ip group = cfg->group;
unsigned char flags = 0;
brmctx = __br_mdb_choose_context(br, entry, extack);
if (!brmctx)
return -EINVAL;
mp = br_multicast_new_group(br, &group);
if (IS_ERR(mp))
return PTR_ERR(mp);
/* 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;
}
if (entry->state == MDB_PERMANENT)
flags |= MDB_PG_FLAGS_PERMANENT;
if (br_multicast_is_star_g(&group))
return br_mdb_add_group_star_g(cfg, mp, brmctx, flags, extack);
else
return br_mdb_add_group_sg(cfg, mp, brmctx, flags, extack);
}
static int __br_mdb_add(const struct br_mdb_config *cfg,
struct netlink_ext_ack *extack)
{
int ret;
spin_lock_bh(&cfg->br->multicast_lock);
ret = br_mdb_add_group(cfg, extack);
spin_unlock_bh(&cfg->br->multicast_lock);
return ret;
}
static int br_mdb_config_src_entry_init(struct nlattr *src_entry,
struct br_mdb_src_entry *src,
__be16 proto,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[MDBE_SRCATTR_MAX + 1];
int err;
err = nla_parse_nested(tb, MDBE_SRCATTR_MAX, src_entry,
br_mdbe_src_list_entry_pol, extack);
if (err)
return err;
if (NL_REQ_ATTR_CHECK(extack, src_entry, tb, MDBE_SRCATTR_ADDRESS))
return -EINVAL;
if (!is_valid_mdb_source(tb[MDBE_SRCATTR_ADDRESS], proto, extack))
return -EINVAL;
src->addr.proto = proto;
nla_memcpy(&src->addr.src, tb[MDBE_SRCATTR_ADDRESS],
nla_len(tb[MDBE_SRCATTR_ADDRESS]));
return 0;
}
static int br_mdb_config_src_list_init(struct nlattr *src_list,
struct br_mdb_config *cfg,
struct netlink_ext_ack *extack)
{
struct nlattr *src_entry;
int rem, err;
int i = 0;
nla_for_each_nested(src_entry, src_list, rem)
cfg->num_src_entries++;
if (cfg->num_src_entries >= PG_SRC_ENT_LIMIT) {
NL_SET_ERR_MSG_FMT_MOD(extack, "Exceeded maximum number of source entries (%u)",
PG_SRC_ENT_LIMIT - 1);
return -EINVAL;
}
cfg->src_entries = kcalloc(cfg->num_src_entries,
sizeof(struct br_mdb_src_entry), GFP_KERNEL);
if (!cfg->src_entries)
return -ENOMEM;
nla_for_each_nested(src_entry, src_list, rem) {
err = br_mdb_config_src_entry_init(src_entry,
&cfg->src_entries[i],
cfg->entry->addr.proto,
extack);
if (err)
goto err_src_entry_init;
i++;
}
return 0;
err_src_entry_init:
kfree(cfg->src_entries);
return err;
}
static void br_mdb_config_src_list_fini(struct br_mdb_config *cfg)
{
kfree(cfg->src_entries);
}
static int br_mdb_config_attrs_init(struct nlattr *set_attrs,
struct br_mdb_config *cfg,
struct netlink_ext_ack *extack)
{
struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1];
int err;
err = nla_parse_nested(mdb_attrs, MDBE_ATTR_MAX, set_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],
cfg->entry->addr.proto, extack))
return -EINVAL;
__mdb_entry_to_br_ip(cfg->entry, &cfg->group, mdb_attrs);
if (mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
if (!cfg->p) {
NL_SET_ERR_MSG_MOD(extack, "Filter mode cannot be set for host groups");
return -EINVAL;
}
if (!br_multicast_is_star_g(&cfg->group)) {
NL_SET_ERR_MSG_MOD(extack, "Filter mode can only be set for (*, G) entries");
return -EINVAL;
}
cfg->filter_mode = nla_get_u8(mdb_attrs[MDBE_ATTR_GROUP_MODE]);
} else {
cfg->filter_mode = MCAST_EXCLUDE;
}
if (mdb_attrs[MDBE_ATTR_SRC_LIST]) {
if (!cfg->p) {
NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set for host groups");
return -EINVAL;
}
if (!br_multicast_is_star_g(&cfg->group)) {
NL_SET_ERR_MSG_MOD(extack, "Source list can only be set for (*, G) entries");
return -EINVAL;
}
if (!mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set without filter mode");
return -EINVAL;
}
err = br_mdb_config_src_list_init(mdb_attrs[MDBE_ATTR_SRC_LIST],
cfg, extack);
if (err)
return err;
}
if (!cfg->num_src_entries && cfg->filter_mode == MCAST_INCLUDE) {
NL_SET_ERR_MSG_MOD(extack, "Cannot add (*, G) INCLUDE with an empty source list");
return -EINVAL;
}
if (mdb_attrs[MDBE_ATTR_RTPROT]) {
if (!cfg->p) {
NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be set for host groups");
return -EINVAL;
}
cfg->rt_protocol = nla_get_u8(mdb_attrs[MDBE_ATTR_RTPROT]);
}
return 0;
}
static int br_mdb_config_init(struct br_mdb_config *cfg, struct net_device *dev,
struct nlattr *tb[], u16 nlmsg_flags,
struct netlink_ext_ack *extack)
{
struct net *net = dev_net(dev);
memset(cfg, 0, sizeof(*cfg));
cfg->filter_mode = MCAST_EXCLUDE;
cfg->rt_protocol = RTPROT_STATIC;
cfg->nlflags = nlmsg_flags;
cfg->br = netdev_priv(dev);
if (!netif_running(cfg->br->dev)) {
NL_SET_ERR_MSG_MOD(extack, "Bridge device is not running");
return -EINVAL;
}
if (!br_opt_get(cfg->br, BROPT_MULTICAST_ENABLED)) {
NL_SET_ERR_MSG_MOD(extack, "Bridge's multicast processing is disabled");
return -EINVAL;
}
cfg->entry = nla_data(tb[MDBA_SET_ENTRY]);
if (cfg->entry->ifindex != cfg->br->dev->ifindex) {
struct net_device *pdev;
pdev = __dev_get_by_index(net, cfg->entry->ifindex);
if (!pdev) {
NL_SET_ERR_MSG_MOD(extack, "Port net device doesn't exist");
return -ENODEV;
}
cfg->p = br_port_get_rtnl(pdev);
if (!cfg->p) {
NL_SET_ERR_MSG_MOD(extack, "Net device is not a bridge port");
return -EINVAL;
}
if (cfg->p->br != cfg->br) {
NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device");
return -EINVAL;
}
}
if (cfg->entry->addr.proto == htons(ETH_P_IP) &&
ipv4_is_zeronet(cfg->entry->addr.u.ip4)) {
NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address 0.0.0.0 is not allowed");
return -EINVAL;
}
if (tb[MDBA_SET_ENTRY_ATTRS])
return br_mdb_config_attrs_init(tb[MDBA_SET_ENTRY_ATTRS], cfg,
extack);
else
__mdb_entry_to_br_ip(cfg->entry, &cfg->group, NULL);
return 0;
}
static void br_mdb_config_fini(struct br_mdb_config *cfg)
{
br_mdb_config_src_list_fini(cfg);
}
int br_mdb_add(struct net_device *dev, struct nlattr *tb[], u16 nlmsg_flags,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
struct br_mdb_config cfg;
int err;
err = br_mdb_config_init(&cfg, dev, tb, nlmsg_flags, extack);
if (err)
return err;
err = -EINVAL;
/* host join errors which can happen before creating the group */
if (!cfg.p && !br_group_is_l2(&cfg.group)) {
/* don't allow any flags for host-joined IP groups */
if (cfg.entry->state) {
NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups");
goto out;
}
if (!br_multicast_is_star_g(&cfg.group)) {
NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined");
goto out;
}
}
if (br_group_is_l2(&cfg.group) && cfg.entry->state != MDB_PERMANENT) {
NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed");
goto out;
}
if (cfg.p) {
if (cfg.p->state == BR_STATE_DISABLED && cfg.entry->state != MDB_PERMANENT) {
NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state and entry is not permanent");
goto out;
}
vg = nbp_vlan_group(cfg.p);
} else {
vg = br_vlan_group(cfg.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(cfg.br->dev) && vg && cfg.entry->vid == 0) {
list_for_each_entry(v, &vg->vlan_list, vlist) {
cfg.entry->vid = v->vid;
cfg.group.vid = v->vid;
err = __br_mdb_add(&cfg, extack);
if (err)
break;
}
} else {
err = __br_mdb_add(&cfg, extack);
}
out:
br_mdb_config_fini(&cfg);
return err;
}
static int __br_mdb_del(const struct br_mdb_config *cfg)
{
struct br_mdb_entry *entry = cfg->entry;
struct net_bridge *br = cfg->br;
struct net_bridge_mdb_entry *mp;
struct net_bridge_port_group *p;
struct net_bridge_port_group __rcu **pp;
struct br_ip ip = cfg->group;
int err = -EINVAL;
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;
}
int br_mdb_del(struct net_device *dev, struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *v;
struct br_mdb_config cfg;
int err;
err = br_mdb_config_init(&cfg, dev, tb, 0, extack);
if (err)
return err;
if (cfg.p)
vg = nbp_vlan_group(cfg.p);
else
vg = br_vlan_group(cfg.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(cfg.br->dev) && vg && cfg.entry->vid == 0) {
list_for_each_entry(v, &vg->vlan_list, vlist) {
cfg.entry->vid = v->vid;
cfg.group.vid = v->vid;
err = __br_mdb_del(&cfg);
}
} else {
err = __br_mdb_del(&cfg);
}
br_mdb_config_fini(&cfg);
return err;
}
struct br_mdb_flush_desc {
u32 port_ifindex;
u16 vid;
u8 rt_protocol;
u8 state;
u8 state_mask;
};
static const struct nla_policy br_mdbe_attrs_del_bulk_pol[MDBE_ATTR_MAX + 1] = {
[MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
[MDBE_ATTR_STATE_MASK] = NLA_POLICY_MASK(NLA_U8, MDB_PERMANENT),
};
static int br_mdb_flush_desc_init(struct br_mdb_flush_desc *desc,
struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
struct br_mdb_entry *entry = nla_data(tb[MDBA_SET_ENTRY]);
struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
int err;
desc->port_ifindex = entry->ifindex;
desc->vid = entry->vid;
desc->state = entry->state;
if (!tb[MDBA_SET_ENTRY_ATTRS])
return 0;
err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX,
tb[MDBA_SET_ENTRY_ATTRS],
br_mdbe_attrs_del_bulk_pol, extack);
if (err)
return err;
if (mdbe_attrs[MDBE_ATTR_STATE_MASK])
desc->state_mask = nla_get_u8(mdbe_attrs[MDBE_ATTR_STATE_MASK]);
if (mdbe_attrs[MDBE_ATTR_RTPROT])
desc->rt_protocol = nla_get_u8(mdbe_attrs[MDBE_ATTR_RTPROT]);
return 0;
}
static void br_mdb_flush_host(struct net_bridge *br,
struct net_bridge_mdb_entry *mp,
const struct br_mdb_flush_desc *desc)
{
u8 state;
if (desc->port_ifindex && desc->port_ifindex != br->dev->ifindex)
return;
if (desc->rt_protocol)
return;
state = br_group_is_l2(&mp->addr) ? MDB_PERMANENT : 0;
if (desc->state_mask && (state & desc->state_mask) != desc->state)
return;
br_multicast_host_leave(mp, true);
if (!mp->ports && netif_running(br->dev))
mod_timer(&mp->timer, jiffies);
}
static void br_mdb_flush_pgs(struct net_bridge *br,
struct net_bridge_mdb_entry *mp,
const struct br_mdb_flush_desc *desc)
{
struct net_bridge_port_group __rcu **pp;
struct net_bridge_port_group *p;
for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;) {
u8 state;
if (desc->port_ifindex &&
desc->port_ifindex != p->key.port->dev->ifindex) {
pp = &p->next;
continue;
}
if (desc->rt_protocol && desc->rt_protocol != p->rt_protocol) {
pp = &p->next;
continue;
}
state = p->flags & MDB_PG_FLAGS_PERMANENT ? MDB_PERMANENT : 0;
if (desc->state_mask &&
(state & desc->state_mask) != desc->state) {
pp = &p->next;
continue;
}
br_multicast_del_pg(mp, p, pp);
}
}
static void br_mdb_flush(struct net_bridge *br,
const struct br_mdb_flush_desc *desc)
{
struct net_bridge_mdb_entry *mp;
spin_lock_bh(&br->multicast_lock);
/* Safe variant is not needed because entries are removed from the list
* upon group timer expiration or bridge deletion.
*/
hlist_for_each_entry(mp, &br->mdb_list, mdb_node) {
if (desc->vid && desc->vid != mp->addr.vid)
continue;
br_mdb_flush_host(br, mp, desc);
br_mdb_flush_pgs(br, mp, desc);
}
spin_unlock_bh(&br->multicast_lock);
}
int br_mdb_del_bulk(struct net_device *dev, struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
struct net_bridge *br = netdev_priv(dev);
struct br_mdb_flush_desc desc = {};
int err;
err = br_mdb_flush_desc_init(&desc, tb, extack);
if (err)
return err;
br_mdb_flush(br, &desc);
return 0;
}
static const struct nla_policy br_mdbe_attrs_get_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_get_parse(struct net_device *dev, struct nlattr *tb[],
struct br_ip *group, struct netlink_ext_ack *extack)
{
struct br_mdb_entry *entry = nla_data(tb[MDBA_GET_ENTRY]);
struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
int err;
if (!tb[MDBA_GET_ENTRY_ATTRS]) {
__mdb_entry_to_br_ip(entry, group, NULL);
return 0;
}
err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX,
tb[MDBA_GET_ENTRY_ATTRS], br_mdbe_attrs_get_pol,
extack);
if (err)
return err;
if (mdbe_attrs[MDBE_ATTR_SOURCE] &&
!is_valid_mdb_source(mdbe_attrs[MDBE_ATTR_SOURCE],
entry->addr.proto, extack))
return -EINVAL;
__mdb_entry_to_br_ip(entry, group, mdbe_attrs);
return 0;
}
static struct sk_buff *
br_mdb_get_reply_alloc(const struct net_bridge_mdb_entry *mp)
{
struct net_bridge_port_group *pg;
size_t nlmsg_size;
nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
/* MDBA_MDB */
nla_total_size(0) +
/* MDBA_MDB_ENTRY */
nla_total_size(0);
if (mp->host_joined)
nlmsg_size += rtnl_mdb_nlmsg_pg_size(NULL);
for (pg = mlock_dereference(mp->ports, mp->br); pg;
pg = mlock_dereference(pg->next, mp->br))
nlmsg_size += rtnl_mdb_nlmsg_pg_size(pg);
return nlmsg_new(nlmsg_size, GFP_ATOMIC);
}
static int br_mdb_get_reply_fill(struct sk_buff *skb,
struct net_bridge_mdb_entry *mp, u32 portid,
u32 seq)
{
struct nlattr *mdb_nest, *mdb_entry_nest;
struct net_bridge_port_group *pg;
struct br_port_msg *bpm;
struct nlmsghdr *nlh;
int err;
nlh = nlmsg_put(skb, portid, seq, RTM_NEWMDB, sizeof(*bpm), 0);
if (!nlh)
return -EMSGSIZE;
bpm = nlmsg_data(nlh);
memset(bpm, 0, sizeof(*bpm));
bpm->family = AF_BRIDGE;
bpm->ifindex = mp->br->dev->ifindex;
mdb_nest = nla_nest_start_noflag(skb, MDBA_MDB);
if (!mdb_nest) {
err = -EMSGSIZE;
goto cancel;
}
mdb_entry_nest = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
if (!mdb_entry_nest) {
err = -EMSGSIZE;
goto cancel;
}
if (mp->host_joined) {
err = __mdb_fill_info(skb, mp, NULL);
if (err)
goto cancel;
}
for (pg = mlock_dereference(mp->ports, mp->br); pg;
pg = mlock_dereference(pg->next, mp->br)) {
err = __mdb_fill_info(skb, mp, pg);
if (err)
goto cancel;
}
nla_nest_end(skb, mdb_entry_nest);
nla_nest_end(skb, mdb_nest);
nlmsg_end(skb, nlh);
return 0;
cancel:
nlmsg_cancel(skb, nlh);
return err;
}
int br_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid, u32 seq,
struct netlink_ext_ack *extack)
{
struct net_bridge *br = netdev_priv(dev);
struct net_bridge_mdb_entry *mp;
struct sk_buff *skb;
struct br_ip group;
int err;
err = br_mdb_get_parse(dev, tb, &group, extack);
if (err)
return err;
/* Hold the multicast lock to ensure that the MDB entry does not change
* between the time the reply size is determined and when the reply is
* filled in.
*/
spin_lock_bh(&br->multicast_lock);
mp = br_mdb_ip_get(br, &group);
if (!mp || (!mp->ports && !mp->host_joined)) {
NL_SET_ERR_MSG_MOD(extack, "MDB entry not found");
err = -ENOENT;
goto unlock;
}
skb = br_mdb_get_reply_alloc(mp);
if (!skb) {
err = -ENOMEM;
goto unlock;
}
err = br_mdb_get_reply_fill(skb, mp, portid, seq);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to fill MDB get reply");
goto free;
}
spin_unlock_bh(&br->multicast_lock);
return rtnl_unicast(skb, dev_net(dev), portid);
free:
kfree_skb(skb);
unlock:
spin_unlock_bh(&br->multicast_lock);
return err;
}
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