As Stephen mentioned, we need to monitor the mdb changes in user-space, so add notifications via netlink too. Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Graf <tgraf@suug.ch> Signed-off-by: Cong Wang <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
241 lines
5.1 KiB
C
241 lines
5.1 KiB
C
#include <linux/err.h>
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#include <linux/igmp.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <net/ip.h>
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#include <net/netlink.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#endif
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#include "br_private.h"
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static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
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struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p;
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struct hlist_node *n;
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struct nlattr *nest;
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if (!br->multicast_router || hlist_empty(&br->router_list))
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return 0;
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nest = nla_nest_start(skb, MDBA_ROUTER);
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if (nest == NULL)
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return -EMSGSIZE;
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hlist_for_each_entry_rcu(p, n, &br->router_list, rlist) {
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if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
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goto fail;
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}
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nla_nest_end(skb, nest);
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return 0;
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fail:
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nla_nest_cancel(skb, nest);
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return -EMSGSIZE;
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}
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static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
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struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_mdb_htable *mdb;
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struct nlattr *nest, *nest2;
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int i, err = 0;
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int idx = 0, s_idx = cb->args[1];
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if (br->multicast_disabled)
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return 0;
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mdb = rcu_dereference(br->mdb);
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if (!mdb)
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return 0;
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nest = nla_nest_start(skb, MDBA_MDB);
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if (nest == NULL)
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return -EMSGSIZE;
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for (i = 0; i < mdb->max; i++) {
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struct hlist_node *h;
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struct net_bridge_mdb_entry *mp;
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struct net_bridge_port_group *p, **pp;
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struct net_bridge_port *port;
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hlist_for_each_entry_rcu(mp, h, &mdb->mhash[i], hlist[mdb->ver]) {
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if (idx < s_idx)
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goto skip;
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nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
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if (nest2 == NULL) {
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err = -EMSGSIZE;
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goto out;
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}
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for (pp = &mp->ports;
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(p = rcu_dereference(*pp)) != NULL;
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pp = &p->next) {
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port = p->port;
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if (port) {
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struct br_mdb_entry e;
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e.ifindex = port->dev->ifindex;
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e.addr.u.ip4 = p->addr.u.ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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e.addr.u.ip6 = p->addr.u.ip6;
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#endif
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e.addr.proto = p->addr.proto;
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if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
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nla_nest_cancel(skb, nest2);
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err = -EMSGSIZE;
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goto out;
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}
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}
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}
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nla_nest_end(skb, nest2);
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skip:
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idx++;
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}
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}
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out:
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cb->args[1] = idx;
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nla_nest_end(skb, nest);
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return err;
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}
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static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct net_device *dev;
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struct net *net = sock_net(skb->sk);
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struct nlmsghdr *nlh = NULL;
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int idx = 0, s_idx;
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s_idx = cb->args[0];
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rcu_read_lock();
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/* In theory this could be wrapped to 0... */
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cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
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for_each_netdev_rcu(net, dev) {
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if (dev->priv_flags & IFF_EBRIDGE) {
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struct br_port_msg *bpm;
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if (idx < s_idx)
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goto skip;
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nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, RTM_GETMDB,
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sizeof(*bpm), NLM_F_MULTI);
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if (nlh == NULL)
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break;
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bpm = nlmsg_data(nlh);
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bpm->ifindex = dev->ifindex;
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if (br_mdb_fill_info(skb, cb, dev) < 0)
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goto out;
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if (br_rports_fill_info(skb, cb, dev) < 0)
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goto out;
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cb->args[1] = 0;
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nlmsg_end(skb, nlh);
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skip:
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idx++;
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}
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}
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out:
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if (nlh)
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nlmsg_end(skb, nlh);
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rcu_read_unlock();
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cb->args[0] = idx;
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return skb->len;
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}
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static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
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struct net_device *dev,
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struct br_mdb_entry *entry, u32 pid,
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u32 seq, int type, unsigned int flags)
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{
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struct nlmsghdr *nlh;
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struct br_port_msg *bpm;
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struct nlattr *nest, *nest2;
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nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
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if (!nlh)
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return -EMSGSIZE;
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bpm = nlmsg_data(nlh);
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bpm->family = AF_BRIDGE;
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bpm->ifindex = dev->ifindex;
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nest = nla_nest_start(skb, MDBA_MDB);
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if (nest == NULL)
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goto cancel;
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nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
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if (nest2 == NULL)
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goto end;
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if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
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goto end;
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nla_nest_end(skb, nest2);
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nla_nest_end(skb, nest);
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return nlmsg_end(skb, nlh);
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end:
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nla_nest_end(skb, nest);
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cancel:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static inline size_t rtnl_mdb_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct br_port_msg))
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+ nla_total_size(sizeof(struct br_mdb_entry));
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}
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static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
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int type)
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{
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struct net *net = dev_net(dev);
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struct sk_buff *skb;
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int err = -ENOBUFS;
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skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
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if (!skb)
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goto errout;
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err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
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if (err < 0) {
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
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return;
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errout:
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rtnl_set_sk_err(net, RTNLGRP_MDB, err);
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}
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void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
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struct br_ip *group, int type)
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{
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struct br_mdb_entry entry;
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entry.ifindex = port->dev->ifindex;
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entry.addr.proto = group->proto;
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entry.addr.u.ip4 = group->u.ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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entry.addr.u.ip6 = group->u.ip6;
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#endif
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__br_mdb_notify(dev, &entry, type);
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}
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void br_mdb_init(void)
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{
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rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
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}
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