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_ID] = { .type = NLA_U32 },
 192         [IFLA_BRIDGE_VLAN_TUNNEL_VID] = { .type = NLA_U16 },
 193         [IFLA_BRIDGE_VLAN_TUNNEL_FLAGS] = { .type = NLA_U16 },
 194 };
 195
 196 int br_vlan_tunnel_info(const struct net_bridge_port *p, int cmd,
 197                         u16 vid, u32 tun_id, bool *changed)
 198 {
 199         int err = 0;
 200
 201         if (!p)
 202                 return -EINVAL;
 203
 204         switch (cmd) {
 205         case RTM_SETLINK:
 206                 err = nbp_vlan_tunnel_info_add(p, vid, tun_id);
 207                 if (!err)
 208                         *changed = true;
 209                 break;
 210         case RTM_DELLINK:
 211                 if (!nbp_vlan_tunnel_info_delete(p, vid))
 212                         *changed = true;
 213                 break;
 214         }
 215
 216         return err;
 217 }
 218
 219 int br_parse_vlan_tunnel_info(struct nlattr *attr,
 220                               struct vtunnel_info *tinfo)
 221 {
 222         struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
 223         u32 tun_id;
 224         u16 vid, flags = 0;
 225         int err;
 226
 227         memset(tinfo, 0, sizeof(*tinfo));
 228
 229         err = nla_parse_nested_deprecated(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
 230                                           attr, vlan_tunnel_policy, NULL);
 231         if (err < 0)
 232                 return err;
 233
 234         if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] ||
 235             !tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
 236                 return -EINVAL;
 237
 238         tun_id = nla_get_u32(tb[IFLA_BRIDGE_VLAN_TUNNEL_ID]);
 239         vid = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_VID]);
 240         if (vid >= VLAN_VID_MASK)
 241                 return -ERANGE;
 242
 243         if (tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS])
 244                 flags = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS]);
 245
 246         tinfo->tunid = tun_id;
 247         tinfo->vid = vid;
 248         tinfo->flags = flags;
 249
 250         return 0;
 251 }
 252
 253 /* send a notification if v_curr can't enter the range and start a new one */
 254 static void __vlan_tunnel_handle_range(const struct net_bridge_port *p,
 255                                        struct net_bridge_vlan **v_start,
 256                                        struct net_bridge_vlan **v_end,
 257                                        int v_curr, bool curr_change)
 258 {
 259         struct net_bridge_vlan_group *vg;
 260         struct net_bridge_vlan *v;
 261
 262         vg = nbp_vlan_group(p);
 263         if (!vg)
 264                 return;
 265
 266         v = br_vlan_find(vg, v_curr);
 267
 268         if (!*v_start)
 269                 goto out_init;
 270
 271         if (v && curr_change && br_vlan_can_enter_range(v, *v_end)) {
 272                 *v_end = v;
 273                 return;
 274         }
 275
 276         br_vlan_notify(p->br, p, (*v_start)->vid, (*v_end)->vid, RTM_NEWVLAN);
 277 out_init:
 278         /* we start a range only if there are any changes to notify about */
 279         *v_start = curr_change ? v : NULL;
 280         *v_end = *v_start;
 281 }
 282
 283 int br_process_vlan_tunnel_info(const struct net_bridge *br,
 284                                 const struct net_bridge_port *p, int cmd,
 285                                 struct vtunnel_info *tinfo_curr,
 286                                 struct vtunnel_info *tinfo_last,
 287                                 bool *changed)
 288 {
 289         int err;
 290
 291         if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 292                 if (tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
 293                         return -EINVAL;
 294                 memcpy(tinfo_last, tinfo_curr, sizeof(struct vtunnel_info));
 295         } else if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END) {
 296                 struct net_bridge_vlan *v_start = NULL, *v_end = NULL;
 297                 int t, v;
 298
 299                 if (!(tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN))
 300                         return -EINVAL;
 301                 if ((tinfo_curr->vid - tinfo_last->vid) !=
 302                     (tinfo_curr->tunid - tinfo_last->tunid))
 303                         return -EINVAL;
 304                 t = tinfo_last->tunid;
 305                 for (v = tinfo_last->vid; v <= tinfo_curr->vid; v++) {
 306                         bool curr_change = false;
 307
 308                         err = br_vlan_tunnel_info(p, cmd, v, t, &curr_change);
 309                         if (err)
 310                                 break;
 311                         t++;
 312
 313                         if (curr_change)
 314                                 *changed = curr_change;
 315                          __vlan_tunnel_handle_range(p, &v_start, &v_end, v,
 316                                                     curr_change);
 317                 }
 318                 if (v_start && v_end)
 319                         br_vlan_notify(br, p, v_start->vid, v_end->vid,
 320                                        RTM_NEWVLAN);
 321                 if (err)
 322                         return err;
 323
 324                 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
 325                 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
 326         } else {
 327                 if (tinfo_last->flags)
 328                         return -EINVAL;
 329                 err = br_vlan_tunnel_info(p, cmd, tinfo_curr->vid,
 330                                           tinfo_curr->tunid, changed);
 331                 if (err)
 332                         return err;
 333                 br_vlan_notify(br, p, tinfo_curr->vid, 0, RTM_NEWVLAN);
 334                 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
 335                 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
 336         }
 337
 338         return 0;
 339 }