microsoft
/
WSL2-Linux-Kernel
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WSL2-Linux-Kernel/net/bridge/br_mdb.c

1160 строки
28 KiB
C
Исходник Ответственный История

// 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.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) {
/* don't allow any flags for host-joined groups */
if (entry->state) {
NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups");
return -EINVAL;
}
if (!br_multicast_is_star_g(&group)) {
NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined");
return -EINVAL;
}
}
if (br_group_is_l2(&group) && entry->state != MDB_PERMANENT) {
NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed");
return -EINVAL;
}
mp = br_mdb_ip_get(br, &group);
if (!mp) {
mp = br_multicast_new_group(br, &group);
err = PTR_ERR_OR_ZERO(mp);
if (err)
return err;
}
/* host join */
if (!port) {
if (mp->host_joined) {
NL_SET_ERR_MSG_MOD(extack, "Group is already joined by host");
return -EEXIST;
}
br_multicast_host_join(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) {
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);
}
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