Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Bridge netlink control interface |
| 3 | * |
| 4 | * Authors: |
| 5 | * Stephen Hemminger <shemminger@osdl.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 15 | #include <linux/etherdevice.h> |
Thomas Graf | 32fe21c | 2007-03-22 11:59:03 -0700 | [diff] [blame] | 16 | #include <net/rtnetlink.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 17 | #include <net/net_namespace.h> |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 18 | #include <net/sock.h> |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 19 | |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 20 | #include "br_private.h" |
| 21 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 22 | static inline size_t br_nlmsg_size(void) |
| 23 | { |
| 24 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) |
| 25 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ |
| 26 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ |
| 27 | + nla_total_size(4) /* IFLA_MASTER */ |
| 28 | + nla_total_size(4) /* IFLA_MTU */ |
| 29 | + nla_total_size(4) /* IFLA_LINK */ |
| 30 | + nla_total_size(1) /* IFLA_OPERSTATE */ |
| 31 | + nla_total_size(1); /* IFLA_PROTINFO */ |
| 32 | } |
| 33 | |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 34 | /* |
| 35 | * Create one netlink message for one interface |
| 36 | * Contains port and master info as well as carrier and bridge state. |
| 37 | */ |
| 38 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, |
| 39 | u32 pid, u32 seq, int event, unsigned int flags) |
| 40 | { |
| 41 | const struct net_bridge *br = port->br; |
| 42 | const struct net_device *dev = port->dev; |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 43 | struct ifinfomsg *hdr; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 44 | struct nlmsghdr *nlh; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 45 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 46 | |
stephen hemminger | 28a16c9 | 2010-05-10 09:31:09 +0000 | [diff] [blame] | 47 | br_debug(br, "br_fill_info event %d port %s master %s\n", |
| 48 | event, dev->name, br->dev->name); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 49 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 50 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
| 51 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 52 | return -EMSGSIZE; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 53 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 54 | hdr = nlmsg_data(nlh); |
| 55 | hdr->ifi_family = AF_BRIDGE; |
| 56 | hdr->__ifi_pad = 0; |
| 57 | hdr->ifi_type = dev->type; |
| 58 | hdr->ifi_index = dev->ifindex; |
| 59 | hdr->ifi_flags = dev_get_flags(dev); |
| 60 | hdr->ifi_change = 0; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 61 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 62 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
| 63 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); |
| 64 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); |
| 65 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 66 | |
| 67 | if (dev->addr_len) |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 68 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 69 | |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 70 | if (dev->ifindex != dev->iflink) |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 71 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 72 | |
| 73 | if (event == RTM_NEWLINK) |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 74 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 75 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 76 | return nlmsg_end(skb, nlh); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 77 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 78 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 79 | nlmsg_cancel(skb, nlh); |
| 80 | return -EMSGSIZE; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | /* |
| 84 | * Notify listeners of a change in port information |
| 85 | */ |
| 86 | void br_ifinfo_notify(int event, struct net_bridge_port *port) |
| 87 | { |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame] | 88 | struct net *net = dev_net(port->dev); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 89 | struct sk_buff *skb; |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 90 | int err = -ENOBUFS; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 91 | |
stephen hemminger | 28a16c9 | 2010-05-10 09:31:09 +0000 | [diff] [blame] | 92 | br_debug(port->br, "port %u(%s) event %d\n", |
| 93 | (unsigned)port->port_no, port->dev->name, event); |
| 94 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 95 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 96 | if (skb == NULL) |
| 97 | goto errout; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 98 | |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 99 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 100 | if (err < 0) { |
| 101 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ |
| 102 | WARN_ON(err == -EMSGSIZE); |
| 103 | kfree_skb(skb); |
| 104 | goto errout; |
| 105 | } |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 106 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
| 107 | return; |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 108 | errout: |
Stephen Hemminger | bea1b42 | 2006-08-03 16:24:02 -0700 | [diff] [blame] | 109 | if (err < 0) |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame] | 110 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Dump information about all ports, in response to GETLINK |
| 115 | */ |
| 116 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
| 117 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 118 | struct net *net = sock_net(skb->sk); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 119 | struct net_device *dev; |
| 120 | int idx; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 121 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 122 | idx = 0; |
Eric Dumazet | e67f88d | 2011-04-27 22:56:07 +0000 | [diff] [blame] | 123 | rcu_read_lock(); |
| 124 | for_each_netdev_rcu(net, dev) { |
| 125 | struct net_bridge_port *port = br_port_get_rcu(dev); |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 126 | |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 127 | /* not a bridge port */ |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 128 | if (!port || idx < cb->args[0]) |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 129 | goto skip; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 130 | |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 131 | if (br_fill_ifinfo(skb, port, |
Jiri Pirko | f350a0a8 | 2010-06-15 06:50:45 +0000 | [diff] [blame] | 132 | NETLINK_CB(cb->skb).pid, |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 133 | cb->nlh->nlmsg_seq, RTM_NEWLINK, |
| 134 | NLM_F_MULTI) < 0) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 135 | break; |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 136 | skip: |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 137 | ++idx; |
| 138 | } |
Eric Dumazet | e67f88d | 2011-04-27 22:56:07 +0000 | [diff] [blame] | 139 | rcu_read_unlock(); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 140 | cb->args[0] = idx; |
| 141 | |
| 142 | return skb->len; |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * Change state of port (ie from forwarding to blocking etc) |
| 147 | * Used by spanning tree in user space. |
| 148 | */ |
| 149 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
| 150 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 151 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 152 | struct ifinfomsg *ifm; |
| 153 | struct nlattr *protinfo; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 154 | struct net_device *dev; |
| 155 | struct net_bridge_port *p; |
| 156 | u8 new_state; |
| 157 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 158 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
| 159 | return -EINVAL; |
| 160 | |
| 161 | ifm = nlmsg_data(nlh); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 162 | if (ifm->ifi_family != AF_BRIDGE) |
| 163 | return -EPFNOSUPPORT; |
| 164 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 165 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
| 166 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 167 | return -EINVAL; |
| 168 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 169 | new_state = nla_get_u8(protinfo); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 170 | if (new_state > BR_STATE_BLOCKING) |
| 171 | return -EINVAL; |
| 172 | |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame] | 173 | dev = __dev_get_by_index(net, ifm->ifi_index); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 174 | if (!dev) |
| 175 | return -ENODEV; |
| 176 | |
Eric Dumazet | ec1e561 | 2010-11-15 06:38:14 +0000 | [diff] [blame] | 177 | p = br_port_get_rtnl(dev); |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 178 | if (!p) |
| 179 | return -EINVAL; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 180 | |
| 181 | /* if kernel STP is running, don't allow changes */ |
Stephen Hemminger | 9cde070 | 2007-03-21 14:22:44 -0700 | [diff] [blame] | 182 | if (p->br->stp_enabled == BR_KERNEL_STP) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 183 | return -EBUSY; |
| 184 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 185 | if (!netif_running(dev) || |
| 186 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 187 | return -ENETDOWN; |
| 188 | |
| 189 | p->state = new_state; |
| 190 | br_log_state(p); |
stephen hemminger | 4ecb961 | 2011-07-22 07:47:09 +0000 | [diff] [blame] | 191 | br_ifinfo_notify(RTM_NEWLINK, p); |
| 192 | |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 193 | return 0; |
| 194 | } |
| 195 | |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 196 | static int br_validate(struct nlattr *tb[], struct nlattr *data[]) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 197 | { |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 198 | if (tb[IFLA_ADDRESS]) { |
| 199 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 200 | return -EINVAL; |
| 201 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 202 | return -EADDRNOTAVAIL; |
| 203 | } |
Thomas Graf | 32fe21c | 2007-03-22 11:59:03 -0700 | [diff] [blame] | 204 | |
| 205 | return 0; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 206 | } |
| 207 | |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 208 | static struct rtnl_link_ops br_link_ops __read_mostly = { |
| 209 | .kind = "bridge", |
| 210 | .priv_size = sizeof(struct net_bridge), |
| 211 | .setup = br_dev_setup, |
| 212 | .validate = br_validate, |
stephen hemminger | 1ce5cce | 2011-10-06 11:19:41 +0000 | [diff] [blame] | 213 | .dellink = br_dev_delete, |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 214 | }; |
| 215 | |
| 216 | int __init br_netlink_init(void) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 217 | { |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 218 | int err; |
| 219 | |
| 220 | err = rtnl_link_register(&br_link_ops); |
| 221 | if (err < 0) |
| 222 | goto err1; |
| 223 | |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 224 | err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, |
| 225 | br_dump_ifinfo, NULL); |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 226 | if (err) |
| 227 | goto err2; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 228 | err = __rtnl_register(PF_BRIDGE, RTM_SETLINK, |
| 229 | br_rtm_setlink, NULL, NULL); |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 230 | if (err) |
| 231 | goto err3; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 232 | err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, |
| 233 | br_fdb_add, NULL, NULL); |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 234 | if (err) |
| 235 | goto err3; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 236 | err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, |
| 237 | br_fdb_delete, NULL, NULL); |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 238 | if (err) |
| 239 | goto err3; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 240 | err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH, |
| 241 | NULL, br_fdb_dump, NULL); |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 242 | if (err) |
| 243 | goto err3; |
| 244 | |
| 245 | return 0; |
| 246 | |
| 247 | err3: |
Thomas Graf | 32fe21c | 2007-03-22 11:59:03 -0700 | [diff] [blame] | 248 | rtnl_unregister_all(PF_BRIDGE); |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 249 | err2: |
| 250 | rtnl_link_unregister(&br_link_ops); |
| 251 | err1: |
| 252 | return err; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 253 | } |
| 254 | |
stephen hemminger | bb900b2 | 2011-04-04 14:03:32 +0000 | [diff] [blame] | 255 | void __exit br_netlink_fini(void) |
| 256 | { |
| 257 | rtnl_link_unregister(&br_link_ops); |
| 258 | rtnl_unregister_all(PF_BRIDGE); |
| 259 | } |