Pileus Git - ~andy/linux/blob - net/bridge/br_netlink.c

   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>
  14 #include <linux/slab.h>
  15 #include <linux/etherdevice.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/net_namespace.h>
  18 #include <net/sock.h>
  19 #include <uapi/linux/if_bridge.h>
  20
  21 #include "br_private.h"
  22 #include "br_private_stp.h"
  23
  24 static inline size_t br_port_info_size(void)
  25 {
  26         return nla_total_size(1)        /* IFLA_BRPORT_STATE  */
  27                 + nla_total_size(2)     /* IFLA_BRPORT_PRIORITY */
  28                 + nla_total_size(4)     /* IFLA_BRPORT_COST */
  29                 + nla_total_size(1)     /* IFLA_BRPORT_MODE */
  30                 + nla_total_size(1)     /* IFLA_BRPORT_GUARD */
  31                 + nla_total_size(1)     /* IFLA_BRPORT_PROTECT */
  32                 + 0;
  33 }
  34
  35 static inline size_t br_nlmsg_size(void)
  36 {
  37         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
  38                 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
  39                 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
  40                 + nla_total_size(4) /* IFLA_MASTER */
  41                 + nla_total_size(4) /* IFLA_MTU */
  42                 + nla_total_size(4) /* IFLA_LINK */
  43                 + nla_total_size(1) /* IFLA_OPERSTATE */
  44                 + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
  45 }
  46
  47 static int br_port_fill_attrs(struct sk_buff *skb,
  48                               const struct net_bridge_port *p)
  49 {
  50         u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
  51
  52         if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
  53             nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
  54             nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
  55             nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
  56             nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
  57             nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
  58             nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)))
  59                 return -EMSGSIZE;
  60
  61         return 0;
  62 }
  63
  64 /*
  65  * Create one netlink message for one interface
  66  * Contains port and master info as well as carrier and bridge state.
  67  */
  68 static int br_fill_ifinfo(struct sk_buff *skb,
  69                           const struct net_bridge_port *port,
  70                           u32 pid, u32 seq, int event, unsigned int flags,
  71                           u32 filter_mask, const struct net_device *dev)
  72 {
  73         const struct net_bridge *br;
  74         struct ifinfomsg *hdr;
  75         struct nlmsghdr *nlh;
  76         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
  77
  78         if (port)
  79                 br = port->br;
  80         else
  81                 br = netdev_priv(dev);
  82
  83         br_debug(br, "br_fill_info event %d port %s master %s\n",
  84                      event, dev->name, br->dev->name);
  85
  86         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
  87         if (nlh == NULL)
  88                 return -EMSGSIZE;
  89
  90         hdr = nlmsg_data(nlh);
  91         hdr->ifi_family = AF_BRIDGE;
  92         hdr->__ifi_pad = 0;
  93         hdr->ifi_type = dev->type;
  94         hdr->ifi_index = dev->ifindex;
  95         hdr->ifi_flags = dev_get_flags(dev);
  96         hdr->ifi_change = 0;
  97
  98         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
  99             nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
 100             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 101             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
 102             (dev->addr_len &&
 103              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
 104             (dev->ifindex != dev->iflink &&
 105              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
 106                 goto nla_put_failure;
 107
 108         if (event == RTM_NEWLINK && port) {
 109                 struct nlattr *nest
 110                         = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
 111
 112                 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
 113                         goto nla_put_failure;
 114                 nla_nest_end(skb, nest);
 115         }
 116
 117         /* Check if  the VID information is requested */
 118         if (filter_mask & RTEXT_FILTER_BRVLAN) {
 119                 struct nlattr *af;
 120                 const struct net_port_vlans *pv;
 121                 struct bridge_vlan_info vinfo;
 122                 u16 vid;
 123                 u16 pvid;
 124
 125                 if (port)
 126                         pv = nbp_get_vlan_info(port);
 127                 else
 128                         pv = br_get_vlan_info(br);
 129
 130                 if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN))
 131                         goto done;
 132
 133                 af = nla_nest_start(skb, IFLA_AF_SPEC);
 134                 if (!af)
 135                         goto nla_put_failure;
 136
 137                 pvid = br_get_pvid(pv);
 138                 for (vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
 139                      vid < BR_VLAN_BITMAP_LEN;
 140                      vid = find_next_bit(pv->vlan_bitmap,
 141                                          BR_VLAN_BITMAP_LEN, vid+1)) {
 142                         vinfo.vid = vid;
 143                         vinfo.flags = 0;
 144                         if (vid == pvid)
 145                                 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
 146                         if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 147                                     sizeof(vinfo), &vinfo))
 148                                 goto nla_put_failure;
 149                 }
 150
 151                 nla_nest_end(skb, af);
 152         }
 153
 154 done:
 155         return nlmsg_end(skb, nlh);
 156
 157 nla_put_failure:
 158         nlmsg_cancel(skb, nlh);
 159         return -EMSGSIZE;
 160 }
 161
 162 /*
 163  * Notify listeners of a change in port information
 164  */
 165 void br_ifinfo_notify(int event, struct net_bridge_port *port)
 166 {
 167         struct net *net;
 168         struct sk_buff *skb;
 169         int err = -ENOBUFS;
 170
 171         if (!port)
 172                 return;
 173
 174         net = dev_net(port->dev);
 175         br_debug(port->br, "port %u(%s) event %d\n",
 176                  (unsigned int)port->port_no, port->dev->name, event);
 177
 178         skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
 179         if (skb == NULL)
 180                 goto errout;
 181
 182         err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
 183         if (err < 0) {
 184                 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
 185                 WARN_ON(err == -EMSGSIZE);
 186                 kfree_skb(skb);
 187                 goto errout;
 188         }
 189         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 190         return;
 191 errout:
 192         if (err < 0)
 193                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 194 }
 195
 196
 197 /*
 198  * Dump information about all ports, in response to GETLINK
 199  */
 200 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 201                struct net_device *dev, u32 filter_mask)
 202 {
 203         int err = 0;
 204         struct net_bridge_port *port = br_port_get_rcu(dev);
 205
 206         /* not a bridge port and  */
 207         if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
 208                 goto out;
 209
 210         err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
 211                              filter_mask, dev);
 212 out:
 213         return err;
 214 }
 215
 216 const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
 217         [IFLA_BRIDGE_FLAGS]     = { .type = NLA_U16 },
 218         [IFLA_BRIDGE_MODE]      = { .type = NLA_U16 },
 219         [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
 220                                     .len = sizeof(struct bridge_vlan_info), },
 221 };
 222
 223 static int br_afspec(struct net_bridge *br,
 224                      struct net_bridge_port *p,
 225                      struct nlattr *af_spec,
 226                      int cmd)
 227 {
 228         struct nlattr *tb[IFLA_BRIDGE_MAX+1];
 229         int err = 0;
 230
 231         err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
 232         if (err)
 233                 return err;
 234
 235         if (tb[IFLA_BRIDGE_VLAN_INFO]) {
 236                 struct bridge_vlan_info *vinfo;
 237
 238                 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
 239
 240                 if (vinfo->vid >= VLAN_N_VID)
 241                         return -EINVAL;
 242
 243                 switch (cmd) {
 244                 case RTM_SETLINK:
 245                         if (p) {
 246                                 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
 247                                 if (err)
 248                                         break;
 249
 250                                 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 251                                         err = br_vlan_add(p->br, vinfo->vid,
 252                                                           vinfo->flags);
 253                         } else
 254                                 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
 255
 256                         if (err)
 257                                 break;
 258
 259                         break;
 260
 261                 case RTM_DELLINK:
 262                         if (p) {
 263                                 nbp_vlan_delete(p, vinfo->vid);
 264                                 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 265                                         br_vlan_delete(p->br, vinfo->vid);
 266                         } else
 267                                 br_vlan_delete(br, vinfo->vid);
 268                         break;
 269                 }
 270         }
 271
 272         return err;
 273 }
 274
 275 static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
 276         [IFLA_BRPORT_STATE]     = { .type = NLA_U8 },
 277         [IFLA_BRPORT_COST]      = { .type = NLA_U32 },
 278         [IFLA_BRPORT_PRIORITY]  = { .type = NLA_U16 },
 279         [IFLA_BRPORT_MODE]      = { .type = NLA_U8 },
 280         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
 281         [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
 282 };
 283
 284 /* Change the state of the port and notify spanning tree */
 285 static int br_set_port_state(struct net_bridge_port *p, u8 state)
 286 {
 287         if (state > BR_STATE_BLOCKING)
 288                 return -EINVAL;
 289
 290         /* if kernel STP is running, don't allow changes */
 291         if (p->br->stp_enabled == BR_KERNEL_STP)
 292                 return -EBUSY;
 293
 294         /* if device is not up, change is not allowed
 295          * if link is not present, only allowable state is disabled
 296          */
 297         if (!netif_running(p->dev) ||
 298             (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
 299                 return -ENETDOWN;
 300
 301         p->state = state;
 302         br_log_state(p);
 303         br_port_state_selection(p->br);
 304         return 0;
 305 }
 306
 307 /* Set/clear or port flags based on attribute */
 308 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 309                            int attrtype, unsigned long mask)
 310 {
 311         if (tb[attrtype]) {
 312                 u8 flag = nla_get_u8(tb[attrtype]);
 313                 if (flag)
 314                         p->flags |= mask;
 315                 else
 316                         p->flags &= ~mask;
 317         }
 318 }
 319
 320 /* Process bridge protocol info on port */
 321 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 322 {
 323         int err;
 324
 325         br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
 326         br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
 327         br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
 328
 329         if (tb[IFLA_BRPORT_COST]) {
 330                 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
 331                 if (err)
 332                         return err;
 333         }
 334
 335         if (tb[IFLA_BRPORT_PRIORITY]) {
 336                 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
 337                 if (err)
 338                         return err;
 339         }
 340
 341         if (tb[IFLA_BRPORT_STATE]) {
 342                 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
 343                 if (err)
 344                         return err;
 345         }
 346         return 0;
 347 }
 348
 349 /* Change state and parameters on port. */
 350 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
 351 {
 352         struct ifinfomsg *ifm;
 353         struct nlattr *protinfo;
 354         struct nlattr *afspec;
 355         struct net_bridge_port *p;
 356         struct nlattr *tb[IFLA_BRPORT_MAX + 1];
 357         int err;
 358
 359         ifm = nlmsg_data(nlh);
 360
 361         protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
 362         afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
 363         if (!protinfo && !afspec)
 364                 return 0;
 365
 366         p = br_port_get_rtnl(dev);
 367         /* We want to accept dev as bridge itself if the AF_SPEC
 368          * is set to see if someone is setting vlan info on the brigde
 369          */
 370         if (!p && ((dev->priv_flags & IFF_EBRIDGE) && !afspec))
 371                 return -EINVAL;
 372
 373         if (p && protinfo) {
 374                 if (protinfo->nla_type & NLA_F_NESTED) {
 375                         err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
 376                                                protinfo, ifla_brport_policy);
 377                         if (err)
 378                                 return err;
 379
 380                         spin_lock_bh(&p->br->lock);
 381                         err = br_setport(p, tb);
 382                         spin_unlock_bh(&p->br->lock);
 383                 } else {
 384                         /* Binary compatability with old RSTP */
 385                         if (nla_len(protinfo) < sizeof(u8))
 386                                 return -EINVAL;
 387
 388                         spin_lock_bh(&p->br->lock);
 389                         err = br_set_port_state(p, nla_get_u8(protinfo));
 390                         spin_unlock_bh(&p->br->lock);
 391                 }
 392                 if (err)
 393                         goto out;
 394         }
 395
 396         if (afspec) {
 397                 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 398                                 afspec, RTM_SETLINK);
 399         }
 400
 401         if (err == 0)
 402                 br_ifinfo_notify(RTM_NEWLINK, p);
 403
 404 out:
 405         return err;
 406 }
 407
 408 /* Delete port information */
 409 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
 410 {
 411         struct ifinfomsg *ifm;
 412         struct nlattr *afspec;
 413         struct net_bridge_port *p;
 414         int err;
 415
 416         ifm = nlmsg_data(nlh);
 417
 418         afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
 419         if (!afspec)
 420                 return 0;
 421
 422         p = br_port_get_rtnl(dev);
 423         /* We want to accept dev as bridge itself as well */
 424         if (!p && !(dev->priv_flags & IFF_EBRIDGE))
 425                 return -EINVAL;
 426
 427         err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 428                         afspec, RTM_DELLINK);
 429
 430         return err;
 431 }
 432 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
 433 {
 434         if (tb[IFLA_ADDRESS]) {
 435                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 436                         return -EINVAL;
 437                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 438                         return -EADDRNOTAVAIL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static size_t br_get_link_af_size(const struct net_device *dev)
 445 {
 446         struct net_port_vlans *pv;
 447
 448         if (br_port_exists(dev))
 449                 pv = nbp_get_vlan_info(br_port_get_rcu(dev));
 450         else if (dev->priv_flags & IFF_EBRIDGE)
 451                 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
 452         else
 453                 return 0;
 454
 455         if (!pv)
 456                 return 0;
 457
 458         /* Each VLAN is returned in bridge_vlan_info along with flags */
 459         return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
 460 }
 461
 462 struct rtnl_af_ops br_af_ops = {
 463         .family                 = AF_BRIDGE,
 464         .get_link_af_size       = br_get_link_af_size,
 465 };
 466
 467 struct rtnl_link_ops br_link_ops __read_mostly = {
 468         .kind           = "bridge",
 469         .priv_size      = sizeof(struct net_bridge),
 470         .setup          = br_dev_setup,
 471         .validate       = br_validate,
 472         .dellink        = br_dev_delete,
 473 };
 474
 475 int __init br_netlink_init(void)
 476 {
 477         int err;
 478
 479         br_mdb_init();
 480         err = rtnl_af_register(&br_af_ops);
 481         if (err)
 482                 goto out;
 483
 484         err = rtnl_link_register(&br_link_ops);
 485         if (err)
 486                 goto out_af;
 487
 488         return 0;
 489
 490 out_af:
 491         rtnl_af_unregister(&br_af_ops);
 492 out:
 493         br_mdb_uninit();
 494         return err;
 495 }
 496
 497 void __exit br_netlink_fini(void)
 498 {
 499         br_mdb_uninit();
 500         rtnl_af_unregister(&br_af_ops);
 501         rtnl_link_unregister(&br_link_ops);
 502 }