Cong Wang | ee07c6e | 2012-12-07 00:04:48 +0000 | [diff] [blame] | 1 | #include <linux/err.h> |
| 2 | #include <linux/igmp.h> |
| 3 | #include <linux/kernel.h> |
| 4 | #include <linux/netdevice.h> |
| 5 | #include <linux/rculist.h> |
| 6 | #include <linux/skbuff.h> |
| 7 | #include <net/ip.h> |
| 8 | #include <net/netlink.h> |
| 9 | #if IS_ENABLED(CONFIG_IPV6) |
| 10 | #include <net/ipv6.h> |
| 11 | #endif |
| 12 | |
| 13 | #include "br_private.h" |
| 14 | |
| 15 | static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb, |
| 16 | struct net_device *dev) |
| 17 | { |
| 18 | struct net_bridge *br = netdev_priv(dev); |
| 19 | struct net_bridge_port *p; |
| 20 | struct hlist_node *n; |
| 21 | struct nlattr *nest; |
| 22 | |
| 23 | if (!br->multicast_router || hlist_empty(&br->router_list)) |
| 24 | return 0; |
| 25 | |
| 26 | nest = nla_nest_start(skb, MDBA_ROUTER); |
| 27 | if (nest == NULL) |
| 28 | return -EMSGSIZE; |
| 29 | |
| 30 | hlist_for_each_entry_rcu(p, n, &br->router_list, rlist) { |
| 31 | if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex)) |
| 32 | goto fail; |
| 33 | } |
| 34 | |
| 35 | nla_nest_end(skb, nest); |
| 36 | return 0; |
| 37 | fail: |
| 38 | nla_nest_cancel(skb, nest); |
| 39 | return -EMSGSIZE; |
| 40 | } |
| 41 | |
| 42 | static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, |
| 43 | struct net_device *dev) |
| 44 | { |
| 45 | struct net_bridge *br = netdev_priv(dev); |
| 46 | struct net_bridge_mdb_htable *mdb; |
| 47 | struct nlattr *nest, *nest2; |
| 48 | int i, err = 0; |
| 49 | int idx = 0, s_idx = cb->args[1]; |
| 50 | |
| 51 | if (br->multicast_disabled) |
| 52 | return 0; |
| 53 | |
| 54 | mdb = rcu_dereference(br->mdb); |
| 55 | if (!mdb) |
| 56 | return 0; |
| 57 | |
| 58 | nest = nla_nest_start(skb, MDBA_MDB); |
| 59 | if (nest == NULL) |
| 60 | return -EMSGSIZE; |
| 61 | |
| 62 | for (i = 0; i < mdb->max; i++) { |
| 63 | struct hlist_node *h; |
| 64 | struct net_bridge_mdb_entry *mp; |
| 65 | struct net_bridge_port_group *p, **pp; |
| 66 | struct net_bridge_port *port; |
| 67 | |
| 68 | hlist_for_each_entry_rcu(mp, h, &mdb->mhash[i], hlist[mdb->ver]) { |
| 69 | if (idx < s_idx) |
| 70 | goto skip; |
| 71 | |
| 72 | nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); |
| 73 | if (nest2 == NULL) { |
| 74 | err = -EMSGSIZE; |
| 75 | goto out; |
| 76 | } |
| 77 | |
| 78 | for (pp = &mp->ports; |
| 79 | (p = rcu_dereference(*pp)) != NULL; |
| 80 | pp = &p->next) { |
| 81 | port = p->port; |
| 82 | if (port) { |
| 83 | struct br_mdb_entry e; |
| 84 | e.ifindex = port->dev->ifindex; |
| 85 | e.addr.u.ip4 = p->addr.u.ip4; |
| 86 | #if IS_ENABLED(CONFIG_IPV6) |
| 87 | e.addr.u.ip6 = p->addr.u.ip6; |
| 88 | #endif |
| 89 | e.addr.proto = p->addr.proto; |
| 90 | if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) { |
| 91 | nla_nest_cancel(skb, nest2); |
| 92 | err = -EMSGSIZE; |
| 93 | goto out; |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | nla_nest_end(skb, nest2); |
| 98 | skip: |
| 99 | idx++; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | out: |
| 104 | cb->args[1] = idx; |
| 105 | nla_nest_end(skb, nest); |
| 106 | return err; |
| 107 | } |
| 108 | |
| 109 | static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 110 | { |
| 111 | struct net_device *dev; |
| 112 | struct net *net = sock_net(skb->sk); |
| 113 | struct nlmsghdr *nlh = NULL; |
| 114 | int idx = 0, s_idx; |
| 115 | |
| 116 | s_idx = cb->args[0]; |
| 117 | |
| 118 | rcu_read_lock(); |
| 119 | |
Cong Wang | 2ce297f | 2012-12-10 02:15:35 +0000 | [diff] [blame] | 120 | /* In theory this could be wrapped to 0... */ |
| 121 | cb->seq = net->dev_base_seq + br_mdb_rehash_seq; |
Cong Wang | ee07c6e | 2012-12-07 00:04:48 +0000 | [diff] [blame] | 122 | |
| 123 | for_each_netdev_rcu(net, dev) { |
| 124 | if (dev->priv_flags & IFF_EBRIDGE) { |
| 125 | struct br_port_msg *bpm; |
| 126 | |
| 127 | if (idx < s_idx) |
| 128 | goto skip; |
| 129 | |
| 130 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
| 131 | cb->nlh->nlmsg_seq, RTM_GETMDB, |
| 132 | sizeof(*bpm), NLM_F_MULTI); |
| 133 | if (nlh == NULL) |
| 134 | break; |
| 135 | |
| 136 | bpm = nlmsg_data(nlh); |
| 137 | bpm->ifindex = dev->ifindex; |
| 138 | if (br_mdb_fill_info(skb, cb, dev) < 0) |
| 139 | goto out; |
| 140 | if (br_rports_fill_info(skb, cb, dev) < 0) |
| 141 | goto out; |
| 142 | |
| 143 | cb->args[1] = 0; |
| 144 | nlmsg_end(skb, nlh); |
| 145 | skip: |
| 146 | idx++; |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | out: |
| 151 | if (nlh) |
| 152 | nlmsg_end(skb, nlh); |
| 153 | rcu_read_unlock(); |
| 154 | cb->args[0] = idx; |
| 155 | return skb->len; |
| 156 | } |
| 157 | |
Cong Wang | 37a393b | 2012-12-11 22:23:07 +0000 | [diff] [blame^] | 158 | static int nlmsg_populate_mdb_fill(struct sk_buff *skb, |
| 159 | struct net_device *dev, |
| 160 | struct br_mdb_entry *entry, u32 pid, |
| 161 | u32 seq, int type, unsigned int flags) |
| 162 | { |
| 163 | struct nlmsghdr *nlh; |
| 164 | struct br_port_msg *bpm; |
| 165 | struct nlattr *nest, *nest2; |
| 166 | |
| 167 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI); |
| 168 | if (!nlh) |
| 169 | return -EMSGSIZE; |
| 170 | |
| 171 | bpm = nlmsg_data(nlh); |
| 172 | bpm->family = AF_BRIDGE; |
| 173 | bpm->ifindex = dev->ifindex; |
| 174 | nest = nla_nest_start(skb, MDBA_MDB); |
| 175 | if (nest == NULL) |
| 176 | goto cancel; |
| 177 | nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY); |
| 178 | if (nest2 == NULL) |
| 179 | goto end; |
| 180 | |
| 181 | if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry)) |
| 182 | goto end; |
| 183 | |
| 184 | nla_nest_end(skb, nest2); |
| 185 | nla_nest_end(skb, nest); |
| 186 | return nlmsg_end(skb, nlh); |
| 187 | |
| 188 | end: |
| 189 | nla_nest_end(skb, nest); |
| 190 | cancel: |
| 191 | nlmsg_cancel(skb, nlh); |
| 192 | return -EMSGSIZE; |
| 193 | } |
| 194 | |
| 195 | static inline size_t rtnl_mdb_nlmsg_size(void) |
| 196 | { |
| 197 | return NLMSG_ALIGN(sizeof(struct br_port_msg)) |
| 198 | + nla_total_size(sizeof(struct br_mdb_entry)); |
| 199 | } |
| 200 | |
| 201 | static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry, |
| 202 | int type) |
| 203 | { |
| 204 | struct net *net = dev_net(dev); |
| 205 | struct sk_buff *skb; |
| 206 | int err = -ENOBUFS; |
| 207 | |
| 208 | skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC); |
| 209 | if (!skb) |
| 210 | goto errout; |
| 211 | |
| 212 | err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF); |
| 213 | if (err < 0) { |
| 214 | kfree_skb(skb); |
| 215 | goto errout; |
| 216 | } |
| 217 | |
| 218 | rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); |
| 219 | return; |
| 220 | errout: |
| 221 | rtnl_set_sk_err(net, RTNLGRP_MDB, err); |
| 222 | } |
| 223 | |
| 224 | void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, |
| 225 | struct br_ip *group, int type) |
| 226 | { |
| 227 | struct br_mdb_entry entry; |
| 228 | |
| 229 | entry.ifindex = port->dev->ifindex; |
| 230 | entry.addr.proto = group->proto; |
| 231 | entry.addr.u.ip4 = group->u.ip4; |
| 232 | #if IS_ENABLED(CONFIG_IPV6) |
| 233 | entry.addr.u.ip6 = group->u.ip6; |
| 234 | #endif |
| 235 | __br_mdb_notify(dev, &entry, type); |
| 236 | } |
| 237 | |
Cong Wang | ee07c6e | 2012-12-07 00:04:48 +0000 | [diff] [blame] | 238 | void br_mdb_init(void) |
| 239 | { |
| 240 | rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL); |
| 241 | } |