--- /dev/null
+#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>
+#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;
+
+ if (!br->multicast_router || hlist_empty(&br->router_list))
+ return 0;
+
+ nest = nla_nest_start(skb, MDBA_ROUTER);
+ if (nest == NULL)
+ return -EMSGSIZE;
+
+ hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
+ if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
+ goto fail;
+ }
+
+ nla_nest_end(skb, nest);
+ return 0;
+fail:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
+static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev)
+{
+ struct net_bridge *br = netdev_priv(dev);
+ struct net_bridge_mdb_htable *mdb;
+ struct nlattr *nest, *nest2;
+ int i, err = 0;
+ int idx = 0, s_idx = cb->args[1];
+
+ if (br->multicast_disabled)
+ return 0;
+
+ mdb = rcu_dereference(br->mdb);
+ if (!mdb)
+ return 0;
+
+ nest = nla_nest_start(skb, MDBA_MDB);
+ if (nest == NULL)
+ return -EMSGSIZE;
+
+ for (i = 0; i < mdb->max; i++) {
+ struct net_bridge_mdb_entry *mp;
+ struct net_bridge_port_group *p;
+ struct net_bridge_port_group __rcu **pp;
+ struct net_bridge_port *port;
+
+ hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
+ if (idx < s_idx)
+ goto skip;
+
+ nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
+ if (nest2 == NULL) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+
+ for (pp = &mp->ports;
+ (p = rcu_dereference(*pp)) != NULL;
+ pp = &p->next) {
+ port = p->port;
+ if (port) {
+ struct br_mdb_entry e;
+ memset(&e, 0, sizeof(e));
+ e.ifindex = port->dev->ifindex;
+ e.state = p->state;
+ if (p->addr.proto == htons(ETH_P_IP))
+ e.addr.u.ip4 = p->addr.u.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ if (p->addr.proto == htons(ETH_P_IPV6))
+ e.addr.u.ip6 = p->addr.u.ip6;
+#endif
+ e.addr.proto = p->addr.proto;
+ if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
+ nla_nest_cancel(skb, nest2);
+ err = -EMSGSIZE;
+ goto out;
+ }
+ }
+ }
+ nla_nest_end(skb, nest2);
+ skip:
+ idx++;
+ }
+ }
+
+out:
+ cb->args[1] = idx;
+ nla_nest_end(skb, nest);
+ return err;
+}
+
+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;
+
+ s_idx = cb->args[0];
+
+ rcu_read_lock();
+
+ /* In theory this could be wrapped to 0... */
+ cb->seq = net->dev_base_seq + br_mdb_rehash_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 br_mdb_entry *entry, u32 pid,
+ u32 seq, int type, unsigned int flags)
+{
+ struct nlmsghdr *nlh;
+ struct br_port_msg *bpm;
+ struct nlattr *nest, *nest2;
+
+ 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(skb, MDBA_MDB);
+ if (nest == NULL)
+ goto cancel;
+ nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
+ if (nest2 == NULL)
+ goto end;
+
+ if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
+ 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 inline size_t rtnl_mdb_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct br_port_msg))
+ + nla_total_size(sizeof(struct br_mdb_entry));
+}
+
+static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
+ int type)
+{
+ struct net *net = dev_net(dev);
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = nlmsg_populate_mdb_fill(skb, dev, entry, 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);
+}
+
+void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
+ struct br_ip *group, int type)
+{
+ struct br_mdb_entry entry;
+
+ memset(&entry, 0, sizeof(entry));
+ entry.ifindex = port->dev->ifindex;
+ entry.addr.proto = group->proto;
+ entry.addr.u.ip4 = group->u.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ entry.addr.u.ip6 = group->u.ip6;
+#endif
+ __br_mdb_notify(dev, &entry, type);
+}
+
+static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
+{
+ if (entry->ifindex == 0)
+ return false;
+
+ if (entry->addr.proto == htons(ETH_P_IP)) {
+ if (!ipv4_is_multicast(entry->addr.u.ip4))
+ return false;
+ if (ipv4_is_local_multicast(entry->addr.u.ip4))
+ 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))
+ return false;
+#endif
+ } else
+ return false;
+ if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
+ return false;
+
+ return true;
+}
+
+static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct net_device **pdev, struct br_mdb_entry **pentry)
+{
+ 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(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
+ if (err < 0)
+ return err;
+
+ bpm = nlmsg_data(nlh);
+ if (bpm->ifindex == 0) {
+ pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
+ return -EINVAL;
+ }
+
+ dev = __dev_get_by_index(net, bpm->ifindex);
+ if (dev == NULL) {
+ pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
+ return -ENODEV;
+ }
+
+ if (!(dev->priv_flags & IFF_EBRIDGE)) {
+ pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
+ return -EOPNOTSUPP;
+ }
+
+ *pdev = dev;
+
+ if (!tb[MDBA_SET_ENTRY] ||
+ nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
+ pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
+ return -EINVAL;
+ }
+
+ entry = nla_data(tb[MDBA_SET_ENTRY]);
+ if (!is_valid_mdb_entry(entry)) {
+ pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
+ return -EINVAL;
+ }
+
+ *pentry = entry;
+ return 0;
+}
+
+static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
+ struct br_ip *group, unsigned char state)
+{
+ struct net_bridge_mdb_entry *mp;
+ struct net_bridge_port_group *p;
+ struct net_bridge_port_group __rcu **pp;
+ struct net_bridge_mdb_htable *mdb;
+ int err;
+
+ mdb = mlock_dereference(br->mdb, br);
+ mp = br_mdb_ip_get(mdb, group);
+ if (!mp) {
+ mp = br_multicast_new_group(br, port, group);
+ err = PTR_ERR(mp);
+ if (IS_ERR(mp))
+ return err;
+ }
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (p->port == port)
+ return -EEXIST;
+ if ((unsigned long)p->port < (unsigned long)port)
+ break;
+ }
+
+ p = br_multicast_new_port_group(port, group, *pp, state);
+ if (unlikely(!p))
+ return -ENOMEM;
+ rcu_assign_pointer(*pp, p);
+
+ br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
+ return 0;
+}
+
+static int __br_mdb_add(struct net *net, struct net_bridge *br,
+ struct br_mdb_entry *entry)
+{
+ struct br_ip ip;
+ struct net_device *dev;
+ struct net_bridge_port *p;
+ int ret;
+
+ if (!netif_running(br->dev) || br->multicast_disabled)
+ return -EINVAL;
+
+ dev = __dev_get_by_index(net, entry->ifindex);
+ if (!dev)
+ return -ENODEV;
+
+ p = br_port_get_rtnl(dev);
+ if (!p || p->br != br || p->state == BR_STATE_DISABLED)
+ return -EINVAL;
+
+ ip.proto = entry->addr.proto;
+ if (ip.proto == htons(ETH_P_IP))
+ ip.u.ip4 = entry->addr.u.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ else
+ ip.u.ip6 = entry->addr.u.ip6;
+#endif
+
+ spin_lock_bh(&br->multicast_lock);
+ ret = br_mdb_add_group(br, p, &ip, entry->state);
+ spin_unlock_bh(&br->multicast_lock);
+ return ret;
+}
+
+static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ struct net *net = sock_net(skb->sk);
+ struct br_mdb_entry *entry;
+ struct net_device *dev;
+ struct net_bridge *br;
+ int err;
+
+ err = br_mdb_parse(skb, nlh, &dev, &entry);
+ if (err < 0)
+ return err;
+
+ br = netdev_priv(dev);
+
+ err = __br_mdb_add(net, br, entry);
+ if (!err)
+ __br_mdb_notify(dev, entry, RTM_NEWMDB);
+ return err;
+}
+
+static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
+{
+ struct net_bridge_mdb_htable *mdb;
+ 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->multicast_disabled)
+ return -EINVAL;
+
+ ip.proto = entry->addr.proto;
+ if (ip.proto == htons(ETH_P_IP)) {
+ if (timer_pending(&br->ip4_other_query.timer))
+ return -EBUSY;
+
+ ip.u.ip4 = entry->addr.u.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ if (timer_pending(&br->ip6_other_query.timer))
+ return -EBUSY;
+
+ ip.u.ip6 = entry->addr.u.ip6;
+#endif
+ }
+
+ spin_lock_bh(&br->multicast_lock);
+ mdb = mlock_dereference(br->mdb, br);
+
+ mp = br_mdb_ip_get(mdb, &ip);
+ if (!mp)
+ goto unlock;
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (!p->port || p->port->dev->ifindex != entry->ifindex)
+ continue;
+
+ if (p->port->state == BR_STATE_DISABLED)
+ goto unlock;
+
+ rcu_assign_pointer(*pp, p->next);
+ hlist_del_init(&p->mglist);
+ del_timer(&p->timer);
+ call_rcu_bh(&p->rcu, br_multicast_free_pg);
+ err = 0;
+
+ if (!mp->ports && !mp->mglist &&
+ netif_running(br->dev))
+ mod_timer(&mp->timer, jiffies);
+ break;
+ }
+
+unlock:
+ spin_unlock_bh(&br->multicast_lock);
+ return err;
+}
+
+static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ struct net_device *dev;
+ struct br_mdb_entry *entry;
+ struct net_bridge *br;
+ int err;
+
+ err = br_mdb_parse(skb, nlh, &dev, &entry);
+ if (err < 0)
+ return err;
+
+ br = netdev_priv(dev);
+
+ err = __br_mdb_del(br, entry);
+ if (!err)
+ __br_mdb_notify(dev, entry, RTM_DELMDB);
+ return err;
+}
+
+void br_mdb_init(void)
+{
+ rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
+ rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
+ rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
+}
+
+void br_mdb_uninit(void)
+{
+ rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
+ rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
+ rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
+}
Code Review / kvmfornfv.git / blobdiff