net/bridge/br_netlink_tunnel.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      Bridge per vlan tunnel port dst_metadata netlink control interface
   4  *
   5  *      Authors:
   6  *      Roopa Prabhu            <roopa@cumulusnetworks.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/etherdevice.h>
  12 #include <net/rtnetlink.h>
  13 #include <net/net_namespace.h>
  14 #include <net/sock.h>
  15 #include <uapi/linux/if_bridge.h>
  16 #include <net/dst_metadata.h>
  17
  18 #include "br_private.h"
  19 #include "br_private_tunnel.h"
  20
  21 static size_t __get_vlan_tinfo_size(void)
  22 {
  23         return nla_total_size(0) + /* nest IFLA_BRIDGE_VLAN_TUNNEL_INFO */
  24                   nla_total_size(sizeof(u32)) + /* IFLA_BRIDGE_VLAN_TUNNEL_ID */
  25                   nla_total_size(sizeof(u16)) + /* IFLA_BRIDGE_VLAN_TUNNEL_VID */
  26                   nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_VLAN_TUNNEL_FLAGS */
  27 }
  28
  29 bool vlan_tunid_inrange(const struct net_bridge_vlan *v_curr,
  30                         const struct net_bridge_vlan *v_last)
  31 {
  32         __be32 tunid_curr = tunnel_id_to_key32(v_curr->tinfo.tunnel_id);
  33         __be32 tunid_last = tunnel_id_to_key32(v_last->tinfo.tunnel_id);
  34
  35         return (be32_to_cpu(tunid_curr) - be32_to_cpu(tunid_last)) == 1;
  36 }
  37
  38 static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
  39 {
  40         struct net_bridge_vlan *v, *vtbegin = NULL, *vtend = NULL;
  41         int num_tinfos = 0;
  42
  43         /* Count number of vlan infos */
  44         list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
  45                 /* only a context, bridge vlan not activated */
  46                 if (!br_vlan_should_use(v) || !v->tinfo.tunnel_id)
  47                         continue;
  48
  49                 if (!vtbegin) {
  50                         goto initvars;
  51                 } else if ((v->vid - vtend->vid) == 1 &&
  52                            vlan_tunid_inrange(v, vtend)) {
  53                         vtend = v;
  54                         continue;
  55                 } else {
  56                         if ((vtend->vid - vtbegin->vid) > 0)
  57                                 num_tinfos += 2;
  58                         else
  59                                 num_tinfos += 1;
  60                 }
  61 initvars:
  62                 vtbegin = v;
  63                 vtend = v;
  64         }
  65
  66         if (vtbegin && vtend) {
  67                 if ((vtend->vid - vtbegin->vid) > 0)
  68                         num_tinfos += 2;
  69                 else
  70                         num_tinfos += 1;
  71         }
  72
  73         return num_tinfos;
  74 }
  75
  76 int br_get_vlan_tunnel_info_size(struct net_bridge_vlan_group *vg)
  77 {
  78         int num_tinfos;
  79
  80         if (!vg)
  81                 return 0;
  82
  83         rcu_read_lock();
  84         num_tinfos = __get_num_vlan_tunnel_infos(vg);
  85         rcu_read_unlock();
  86
  87         return num_tinfos * __get_vlan_tinfo_size();
  88 }
  89
  90 static int br_fill_vlan_tinfo(struct sk_buff *skb, u16 vid,
  91                               __be64 tunnel_id, u16 flags)
  92 {
  93         __be32 tid = tunnel_id_to_key32(tunnel_id);
  94         struct nlattr *tmap;
  95
  96         tmap = nla_nest_start_noflag(skb, IFLA_BRIDGE_VLAN_TUNNEL_INFO);
  97         if (!tmap)
  98                 return -EMSGSIZE;
  99         if (nla_put_u32(skb, IFLA_BRIDGE_VLAN_TUNNEL_ID,
 100                         be32_to_cpu(tid)))
 101                 goto nla_put_failure;
 102         if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_VID,
 103                         vid))
 104                 goto nla_put_failure;
 105         if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_FLAGS,
 106                         flags))
 107                 goto nla_put_failure;
 108         nla_nest_end(skb, tmap);
 109
 110         return 0;
 111
 112 nla_put_failure:
 113         nla_nest_cancel(skb, tmap);
 114
 115         return -EMSGSIZE;
 116 }
 117
 118 static int br_fill_vlan_tinfo_range(struct sk_buff *skb,
 119                                     struct net_bridge_vlan *vtbegin,
 120                                     struct net_bridge_vlan *vtend)
 121 {
 122         int err;
 123
 124         if (vtend && (vtend->vid - vtbegin->vid) > 0) {
 125                 /* add range to skb */
 126                 err = br_fill_vlan_tinfo(skb, vtbegin->vid,
 127                                          vtbegin->tinfo.tunnel_id,
 128                                          BRIDGE_VLAN_INFO_RANGE_BEGIN);
 129                 if (err)
 130                         return err;
 131
 132                 err = br_fill_vlan_tinfo(skb, vtend->vid,
 133                                          vtend->tinfo.tunnel_id,
 134                                          BRIDGE_VLAN_INFO_RANGE_END);
 135                 if (err)
 136                         return err;
 137         } else {
 138                 err = br_fill_vlan_tinfo(skb, vtbegin->vid,
 139                                          vtbegin->tinfo.tunnel_id,
 140                                          0);
 141                 if (err)
 142                         return err;
 143         }
 144
 145         return 0;
 146 }
 147
 148 int br_fill_vlan_tunnel_info(struct sk_buff *skb,
 149                              struct net_bridge_vlan_group *vg)
 150 {
 151         struct net_bridge_vlan *vtbegin = NULL;
 152         struct net_bridge_vlan *vtend = NULL;
 153         struct net_bridge_vlan *v;
 154         int err;
 155
 156         /* Count number of vlan infos */
 157         list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
 158                 /* only a context, bridge vlan not activated */
 159                 if (!br_vlan_should_use(v))
 160                         continue;
 161
 162                 if (!v->tinfo.tunnel_dst)
 163                         continue;
 164
 165                 if (!vtbegin) {
 166                         goto initvars;
 167                 } else if ((v->vid - vtend->vid) == 1 &&
 168                             vlan_tunid_inrange(v, vtend)) {
 169                         vtend = v;
 170                         continue;
 171                 } else {
 172                         err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
 173                         if (err)
 174                                 return err;
 175                 }
 176 initvars:
 177                 vtbegin = v;
 178                 vtend = v;
 179         }
 180
 181         if (vtbegin) {
 182                 err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
 183                 if (err)
 184                         return err;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static const struct nla_policy vlan_tunnel_policy[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1] = {
 191         [IFLA_BRIDGE_VLAN_TUNNEL_UNSPEC] = {
 192                 .strict_start_type = IFLA_BRIDGE_VLAN_TUNNEL_FLAGS + 1
 193         },
 194         [IFLA_BRIDGE_VLAN_TUNNEL_ID] = { .type = NLA_U32 },
 195         [IFLA_BRIDGE_VLAN_TUNNEL_VID] = { .type = NLA_U16 },
 196         [IFLA_BRIDGE_VLAN_TUNNEL_FLAGS] = { .type = NLA_U16 },
 197 };
 198
 199 int br_vlan_tunnel_info(const struct net_bridge_port *p, int cmd,
 200                         u16 vid, u32 tun_id, bool *changed)
 201 {
 202         int err = 0;
 203
 204         if (!p)
 205                 return -EINVAL;
 206
 207         switch (cmd) {
 208         case RTM_SETLINK:
 209                 err = nbp_vlan_tunnel_info_add(p, vid, tun_id);
 210                 if (!err)
 211                         *changed = true;
 212                 break;
 213         case RTM_DELLINK:
 214                 if (!nbp_vlan_tunnel_info_delete(p, vid))
 215                         *changed = true;
 216                 break;
 217         }
 218
 219         return err;
 220 }
 221
 222 int br_parse_vlan_tunnel_info(struct nlattr *attr,
 223                               struct vtunnel_info *tinfo)
 224 {
 225         struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
 226         u32 tun_id;
 227         u16 vid, flags = 0;
 228         int err;
 229
 230         memset(tinfo, 0, sizeof(*tinfo));
 231
 232         err = nla_parse_nested_deprecated(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
 233                                           attr, vlan_tunnel_policy, NULL);
 234         if (err < 0)
 235                 return err;
 236
 237         if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] ||
 238             !tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
 239                 return -EINVAL;
 240
 241         tun_id = nla_get_u32(tb[IFLA_BRIDGE_VLAN_TUNNEL_ID]);
 242         vid = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_VID]);
 243         if (vid >= VLAN_VID_MASK)
 244                 return -ERANGE;
 245
 246         if (tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS])
 247                 flags = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS]);
 248
 249         tinfo->tunid = tun_id;
 250         tinfo->vid = vid;
 251         tinfo->flags = flags;
 252
 253         return 0;
 254 }
 255
 256 /* send a notification if v_curr can't enter the range and start a new one */
 257 static void __vlan_tunnel_handle_range(const struct net_bridge_port *p,
 258                                        struct net_bridge_vlan **v_start,
 259                                        struct net_bridge_vlan **v_end,
 260                                        int v_curr, bool curr_change)
 261 {
 262         struct net_bridge_vlan_group *vg;
 263         struct net_bridge_vlan *v;
 264
 265         vg = nbp_vlan_group(p);
 266         if (!vg)
 267                 return;
 268
 269         v = br_vlan_find(vg, v_curr);
 270
 271         if (!*v_start)
 272                 goto out_init;
 273
 274         if (v && curr_change && br_vlan_can_enter_range(v, *v_end)) {
 275                 *v_end = v;
 276                 return;
 277         }
 278
 279         br_vlan_notify(p->br, p, (*v_start)->vid, (*v_end)->vid, RTM_NEWVLAN);
 280 out_init:
 281         /* we start a range only if there are any changes to notify about */
 282         *v_start = curr_change ? v : NULL;
 283         *v_end = *v_start;
 284 }
 285
 286 int br_process_vlan_tunnel_info(const struct net_bridge *br,
 287                                 const struct net_bridge_port *p, int cmd,
 288                                 struct vtunnel_info *tinfo_curr,
 289                                 struct vtunnel_info *tinfo_last,
 290                                 bool *changed)
 291 {
 292         int err;
 293
 294         if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 295                 if (tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
 296                         return -EINVAL;
 297                 memcpy(tinfo_last, tinfo_curr, sizeof(struct vtunnel_info));
 298         } else if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END) {
 299                 struct net_bridge_vlan *v_start = NULL, *v_end = NULL;
 300                 int t, v;
 301
 302                 if (!(tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN))
 303                         return -EINVAL;
 304                 if ((tinfo_curr->vid - tinfo_last->vid) !=
 305                     (tinfo_curr->tunid - tinfo_last->tunid))
 306                         return -EINVAL;
 307                 t = tinfo_last->tunid;
 308                 for (v = tinfo_last->vid; v <= tinfo_curr->vid; v++) {
 309                         bool curr_change = false;
 310
 311                         err = br_vlan_tunnel_info(p, cmd, v, t, &curr_change);
 312                         if (err)
 313                                 break;
 314                         t++;
 315
 316                         if (curr_change)
 317                                 *changed = curr_change;
 318                          __vlan_tunnel_handle_range(p, &v_start, &v_end, v,
 319                                                     curr_change);
 320                 }
 321                 if (v_start && v_end)
 322                         br_vlan_notify(br, p, v_start->vid, v_end->vid,
 323                                        RTM_NEWVLAN);
 324                 if (err)
 325                         return err;
 326
 327                 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
 328                 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
 329         } else {
 330                 if (tinfo_last->flags)
 331                         return -EINVAL;
 332                 err = br_vlan_tunnel_info(p, cmd, tinfo_curr->vid,
 333                                           tinfo_curr->tunid, changed);
 334                 if (err)
 335                         return err;
 336                 br_vlan_notify(br, p, tinfo_curr->vid, 0, RTM_NEWVLAN);
 337                 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
 338                 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
 339         }
 340
 341         return 0;
 342 }