net/hsr/hsr_forward.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright 2011-2014 Autronica Fire and Security AS
   3  *
   4  * Author(s):
   5  *      2011-2014 Arvid Brodin, arvid.brodin@alten.se
   6  *
   7  * Frame router for HSR and PRP.
   8  */
   9
  10 #include "hsr_forward.h"
  11 #include <linux/types.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/if_vlan.h>
  15 #include "hsr_main.h"
  16 #include "hsr_framereg.h"
  17
  18 struct hsr_node;
  19
  20 /* The uses I can see for these HSR supervision frames are:
  21  * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
  22  *    22") to reset any sequence_nr counters belonging to that node. Useful if
  23  *    the other node's counter has been reset for some reason.
  24  *    --
  25  *    Or not - resetting the counter and bridging the frame would create a
  26  *    loop, unfortunately.
  27  *
  28  * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
  29  *    frame is received from a particular node, we know something is wrong.
  30  *    We just register these (as with normal frames) and throw them away.
  31  *
  32  * 3) Allow different MAC addresses for the two slave interfaces, using the
  33  *    MacAddressA field.
  34  */
  35 static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
  36 {
  37         struct ethhdr *eth_hdr;
  38         struct hsr_sup_tag *hsr_sup_tag;
  39         struct hsrv1_ethhdr_sp *hsr_V1_hdr;
  40         struct hsr_sup_tlv *hsr_sup_tlv;
  41         u16 total_length = 0;
  42
  43         WARN_ON_ONCE(!skb_mac_header_was_set(skb));
  44         eth_hdr = (struct ethhdr *)skb_mac_header(skb);
  45
  46         /* Correct addr? */
  47         if (!ether_addr_equal(eth_hdr->h_dest,
  48                               hsr->sup_multicast_addr))
  49                 return false;
  50
  51         /* Correct ether type?. */
  52         if (!(eth_hdr->h_proto == htons(ETH_P_PRP) ||
  53               eth_hdr->h_proto == htons(ETH_P_HSR)))
  54                 return false;
  55
  56         /* Get the supervision header from correct location. */
  57         if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
  58                 total_length = sizeof(struct hsrv1_ethhdr_sp);
  59                 if (!pskb_may_pull(skb, total_length))
  60                         return false;
  61
  62                 hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb);
  63                 if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP))
  64                         return false;
  65
  66                 hsr_sup_tag = &hsr_V1_hdr->hsr_sup;
  67         } else {
  68                 total_length = sizeof(struct hsrv0_ethhdr_sp);
  69                 if (!pskb_may_pull(skb, total_length))
  70                         return false;
  71
  72                 hsr_sup_tag =
  73                      &((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup;
  74         }
  75
  76         if (hsr_sup_tag->tlv.HSR_TLV_type != HSR_TLV_ANNOUNCE &&
  77             hsr_sup_tag->tlv.HSR_TLV_type != HSR_TLV_LIFE_CHECK &&
  78             hsr_sup_tag->tlv.HSR_TLV_type != PRP_TLV_LIFE_CHECK_DD &&
  79             hsr_sup_tag->tlv.HSR_TLV_type != PRP_TLV_LIFE_CHECK_DA)
  80                 return false;
  81         if (hsr_sup_tag->tlv.HSR_TLV_length != 12 &&
  82             hsr_sup_tag->tlv.HSR_TLV_length != sizeof(struct hsr_sup_payload))
  83                 return false;
  84
  85         /* Get next tlv */
  86         total_length += hsr_sup_tag->tlv.HSR_TLV_length;
  87         if (!pskb_may_pull(skb, total_length))
  88                 return false;
  89         skb_pull(skb, total_length);
  90         hsr_sup_tlv = (struct hsr_sup_tlv *)skb->data;
  91         skb_push(skb, total_length);
  92
  93         /* if this is a redbox supervision frame we need to verify
  94          * that more data is available
  95          */
  96         if (hsr_sup_tlv->HSR_TLV_type == PRP_TLV_REDBOX_MAC) {
  97                 /* tlv length must be a length of a mac address */
  98                 if (hsr_sup_tlv->HSR_TLV_length != sizeof(struct hsr_sup_payload))
  99                         return false;
 100
 101                 /* make sure another tlv follows */
 102                 total_length += sizeof(struct hsr_sup_tlv) + hsr_sup_tlv->HSR_TLV_length;
 103                 if (!pskb_may_pull(skb, total_length))
 104                         return false;
 105
 106                 /* get next tlv */
 107                 skb_pull(skb, total_length);
 108                 hsr_sup_tlv = (struct hsr_sup_tlv *)skb->data;
 109                 skb_push(skb, total_length);
 110         }
 111
 112         /* end of tlvs must follow at the end */
 113         if (hsr_sup_tlv->HSR_TLV_type == HSR_TLV_EOT &&
 114             hsr_sup_tlv->HSR_TLV_length != 0)
 115                 return false;
 116
 117         return true;
 118 }
 119
 120 static bool is_proxy_supervision_frame(struct hsr_priv *hsr,
 121                                        struct sk_buff *skb)
 122 {
 123         struct hsr_sup_payload *payload;
 124         struct ethhdr *eth_hdr;
 125         u16 total_length = 0;
 126
 127         eth_hdr = (struct ethhdr *)skb_mac_header(skb);
 128
 129         /* Get the HSR protocol revision. */
 130         if (eth_hdr->h_proto == htons(ETH_P_HSR))
 131                 total_length = sizeof(struct hsrv1_ethhdr_sp);
 132         else
 133                 total_length = sizeof(struct hsrv0_ethhdr_sp);
 134
 135         if (!pskb_may_pull(skb, total_length + sizeof(struct hsr_sup_payload)))
 136                 return false;
 137
 138         skb_pull(skb, total_length);
 139         payload = (struct hsr_sup_payload *)skb->data;
 140         skb_push(skb, total_length);
 141
 142         /* For RedBox (HSR-SAN) check if we have received the supervision
 143          * frame with MAC addresses from own ProxyNodeTable.
 144          */
 145         return hsr_is_node_in_db(&hsr->proxy_node_db,
 146                                  payload->macaddress_A);
 147 }
 148
 149 static struct sk_buff *create_stripped_skb_hsr(struct sk_buff *skb_in,
 150                                                struct hsr_frame_info *frame)
 151 {
 152         struct sk_buff *skb;
 153         int copylen;
 154         unsigned char *dst, *src;
 155
 156         skb_pull(skb_in, HSR_HLEN);
 157         skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
 158         skb_push(skb_in, HSR_HLEN);
 159         if (!skb)
 160                 return NULL;
 161
 162         skb_reset_mac_header(skb);
 163
 164         if (skb->ip_summed == CHECKSUM_PARTIAL)
 165                 skb->csum_start -= HSR_HLEN;
 166
 167         copylen = 2 * ETH_ALEN;
 168         if (frame->is_vlan)
 169                 copylen += VLAN_HLEN;
 170         src = skb_mac_header(skb_in);
 171         dst = skb_mac_header(skb);
 172         memcpy(dst, src, copylen);
 173
 174         skb->protocol = eth_hdr(skb)->h_proto;
 175         return skb;
 176 }
 177
 178 struct sk_buff *hsr_get_untagged_frame(struct hsr_frame_info *frame,
 179                                        struct hsr_port *port)
 180 {
 181         if (!frame->skb_std) {
 182                 if (frame->skb_hsr)
 183                         frame->skb_std =
 184                                 create_stripped_skb_hsr(frame->skb_hsr, frame);
 185                 else
 186                         netdev_warn_once(port->dev,
 187                                          "Unexpected frame received in hsr_get_untagged_frame()\n");
 188
 189                 if (!frame->skb_std)
 190                         return NULL;
 191         }
 192
 193         return skb_clone(frame->skb_std, GFP_ATOMIC);
 194 }
 195
 196 struct sk_buff *prp_get_untagged_frame(struct hsr_frame_info *frame,
 197                                        struct hsr_port *port)
 198 {
 199         if (!frame->skb_std) {
 200                 if (frame->skb_prp) {
 201                         /* trim the skb by len - HSR_HLEN to exclude RCT */
 202                         skb_trim(frame->skb_prp,
 203                                  frame->skb_prp->len - HSR_HLEN);
 204                         frame->skb_std =
 205                                 __pskb_copy(frame->skb_prp,
 206                                             skb_headroom(frame->skb_prp),
 207                                             GFP_ATOMIC);
 208                 } else {
 209                         /* Unexpected */
 210                         WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",
 211                                   __FILE__, __LINE__, port->dev->name);
 212                         return NULL;
 213                 }
 214         }
 215
 216         return skb_clone(frame->skb_std, GFP_ATOMIC);
 217 }
 218
 219 static void prp_set_lan_id(struct prp_rct *trailer,
 220                            struct hsr_port *port)
 221 {
 222         int lane_id;
 223
 224         if (port->type == HSR_PT_SLAVE_A)
 225                 lane_id = 0;
 226         else
 227                 lane_id = 1;
 228
 229         /* Add net_id in the upper 3 bits of lane_id */
 230         lane_id |= port->hsr->net_id;
 231         set_prp_lan_id(trailer, lane_id);
 232 }
 233
 234 /* Tailroom for PRP rct should have been created before calling this */
 235 static struct sk_buff *prp_fill_rct(struct sk_buff *skb,
 236                                     struct hsr_frame_info *frame,
 237                                     struct hsr_port *port)
 238 {
 239         struct prp_rct *trailer;
 240         int min_size = ETH_ZLEN;
 241         int lsdu_size;
 242
 243         if (!skb)
 244                 return skb;
 245
 246         if (frame->is_vlan)
 247                 min_size = VLAN_ETH_ZLEN;
 248
 249         if (skb_put_padto(skb, min_size))
 250                 return NULL;
 251
 252         trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN);
 253         lsdu_size = skb->len - 14;
 254         if (frame->is_vlan)
 255                 lsdu_size -= 4;
 256         prp_set_lan_id(trailer, port);
 257         set_prp_LSDU_size(trailer, lsdu_size);
 258         trailer->sequence_nr = htons(frame->sequence_nr);
 259         trailer->PRP_suffix = htons(ETH_P_PRP);
 260         skb->protocol = eth_hdr(skb)->h_proto;
 261
 262         return skb;
 263 }
 264
 265 static void hsr_set_path_id(struct hsr_ethhdr *hsr_ethhdr,
 266                             struct hsr_port *port)
 267 {
 268         int path_id;
 269
 270         if (port->type == HSR_PT_SLAVE_A)
 271                 path_id = 0;
 272         else
 273                 path_id = 1;
 274
 275         set_hsr_tag_path(&hsr_ethhdr->hsr_tag, path_id);
 276 }
 277
 278 static struct sk_buff *hsr_fill_tag(struct sk_buff *skb,
 279                                     struct hsr_frame_info *frame,
 280                                     struct hsr_port *port, u8 proto_version)
 281 {
 282         struct hsr_ethhdr *hsr_ethhdr;
 283         unsigned char *pc;
 284         int lsdu_size;
 285
 286         /* pad to minimum packet size which is 60 + 6 (HSR tag) */
 287         if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
 288                 return NULL;
 289
 290         lsdu_size = skb->len - 14;
 291         if (frame->is_vlan)
 292                 lsdu_size -= 4;
 293
 294         pc = skb_mac_header(skb);
 295         if (frame->is_vlan)
 296                 /* This 4-byte shift (size of a vlan tag) does not
 297                  * mean that the ethhdr starts there. But rather it
 298                  * provides the proper environment for accessing
 299                  * the fields, such as hsr_tag etc., just like
 300                  * when the vlan tag is not there. This is because
 301                  * the hsr tag is after the vlan tag.
 302                  */
 303                 hsr_ethhdr = (struct hsr_ethhdr *)(pc + VLAN_HLEN);
 304         else
 305                 hsr_ethhdr = (struct hsr_ethhdr *)pc;
 306
 307         hsr_set_path_id(hsr_ethhdr, port);
 308         set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
 309         hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
 310         hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
 311         hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
 312                         ETH_P_HSR : ETH_P_PRP);
 313         skb->protocol = hsr_ethhdr->ethhdr.h_proto;
 314
 315         return skb;
 316 }
 317
 318 /* If the original frame was an HSR tagged frame, just clone it to be sent
 319  * unchanged. Otherwise, create a private frame especially tagged for 'port'.
 320  */
 321 struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,
 322                                         struct hsr_port *port)
 323 {
 324         unsigned char *dst, *src;
 325         struct sk_buff *skb;
 326         int movelen;
 327
 328         if (frame->skb_hsr) {
 329                 struct hsr_ethhdr *hsr_ethhdr =
 330                         (struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);
 331
 332                 /* set the lane id properly */
 333                 hsr_set_path_id(hsr_ethhdr, port);
 334                 return skb_clone(frame->skb_hsr, GFP_ATOMIC);
 335         } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) {
 336                 return skb_clone(frame->skb_std, GFP_ATOMIC);
 337         }
 338
 339         /* Create the new skb with enough headroom to fit the HSR tag */
 340         skb = __pskb_copy(frame->skb_std,
 341                           skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);
 342         if (!skb)
 343                 return NULL;
 344         skb_reset_mac_header(skb);
 345
 346         if (skb->ip_summed == CHECKSUM_PARTIAL)
 347                 skb->csum_start += HSR_HLEN;
 348
 349         movelen = ETH_HLEN;
 350         if (frame->is_vlan)
 351                 movelen += VLAN_HLEN;
 352
 353         src = skb_mac_header(skb);
 354         dst = skb_push(skb, HSR_HLEN);
 355         memmove(dst, src, movelen);
 356         skb_reset_mac_header(skb);
 357
 358         /* skb_put_padto free skb on error and hsr_fill_tag returns NULL in
 359          * that case
 360          */
 361         return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
 362 }
 363
 364 struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,
 365                                         struct hsr_port *port)
 366 {
 367         struct sk_buff *skb;
 368
 369         if (frame->skb_prp) {
 370                 struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);
 371
 372                 if (trailer) {
 373                         prp_set_lan_id(trailer, port);
 374                 } else {
 375                         WARN_ONCE(!trailer, "errored PRP skb");
 376                         return NULL;
 377                 }
 378                 return skb_clone(frame->skb_prp, GFP_ATOMIC);
 379         } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) {
 380                 return skb_clone(frame->skb_std, GFP_ATOMIC);
 381         }
 382
 383         skb = skb_copy_expand(frame->skb_std, skb_headroom(frame->skb_std),
 384                               skb_tailroom(frame->skb_std) + HSR_HLEN,
 385                               GFP_ATOMIC);
 386         return prp_fill_rct(skb, frame, port);
 387 }
 388
 389 static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
 390                                struct hsr_node *node_src)
 391 {
 392         bool was_multicast_frame;
 393         int res, recv_len;
 394
 395         was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
 396         hsr_addr_subst_source(node_src, skb);
 397         skb_pull(skb, ETH_HLEN);
 398         recv_len = skb->len;
 399         res = netif_rx(skb);
 400         if (res == NET_RX_DROP) {
 401                 dev->stats.rx_dropped++;
 402         } else {
 403                 dev->stats.rx_packets++;
 404                 dev->stats.rx_bytes += recv_len;
 405                 if (was_multicast_frame)
 406                         dev->stats.multicast++;
 407         }
 408 }
 409
 410 static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
 411                     struct hsr_frame_info *frame)
 412 {
 413         if (frame->port_rcv->type == HSR_PT_MASTER) {
 414                 hsr_addr_subst_dest(frame->node_src, skb, port);
 415
 416                 /* Address substitution (IEC62439-3 pp 26, 50): replace mac
 417                  * address of outgoing frame with that of the outgoing slave's.
 418                  */
 419                 ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
 420         }
 421
 422         /* When HSR node is used as RedBox - the frame received from HSR ring
 423          * requires source MAC address (SA) replacement to one which can be
 424          * recognized by SAN devices (otherwise, frames are dropped by switch)
 425          */
 426         if (port->type == HSR_PT_INTERLINK)
 427                 ether_addr_copy(eth_hdr(skb)->h_source,
 428                                 port->hsr->macaddress_redbox);
 429
 430         return dev_queue_xmit(skb);
 431 }
 432
 433 bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
 434 {
 435         return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&
 436                  port->type == HSR_PT_SLAVE_B) ||
 437                 (frame->port_rcv->type == HSR_PT_SLAVE_B &&
 438                  port->type == HSR_PT_SLAVE_A));
 439 }
 440
 441 bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
 442 {
 443         struct sk_buff *skb;
 444
 445         if (port->dev->features & NETIF_F_HW_HSR_FWD)
 446                 return prp_drop_frame(frame, port);
 447
 448         /* RedBox specific frames dropping policies
 449          *
 450          * Do not send HSR supervisory frames to SAN devices
 451          */
 452         if (frame->is_supervision && port->type == HSR_PT_INTERLINK)
 453                 return true;
 454
 455         /* Do not forward to other HSR port (A or B) unicast frames which
 456          * are addressed to interlink port (and are in the ProxyNodeTable).
 457          */
 458         skb = frame->skb_hsr;
 459         if (skb && prp_drop_frame(frame, port) &&
 460             is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
 461             hsr_is_node_in_db(&port->hsr->proxy_node_db,
 462                               eth_hdr(skb)->h_dest)) {
 463                 return true;
 464         }
 465
 466         /* Do not forward to port C (Interlink) frames from nodes A and B
 467          * if DA is in NodeTable.
 468          */
 469         if ((frame->port_rcv->type == HSR_PT_SLAVE_A ||
 470              frame->port_rcv->type == HSR_PT_SLAVE_B) &&
 471             port->type == HSR_PT_INTERLINK) {
 472                 skb = frame->skb_hsr;
 473                 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
 474                     hsr_is_node_in_db(&port->hsr->node_db,
 475                                       eth_hdr(skb)->h_dest)) {
 476                         return true;
 477                 }
 478         }
 479
 480         /* Do not forward to port A and B unicast frames received on the
 481          * interlink port if it is addressed to one of nodes registered in
 482          * the ProxyNodeTable.
 483          */
 484         if ((port->type == HSR_PT_SLAVE_A || port->type == HSR_PT_SLAVE_B) &&
 485             frame->port_rcv->type == HSR_PT_INTERLINK) {
 486                 skb = frame->skb_std;
 487                 if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
 488                     hsr_is_node_in_db(&port->hsr->proxy_node_db,
 489                                       eth_hdr(skb)->h_dest)) {
 490                         return true;
 491                 }
 492         }
 493
 494         return false;
 495 }
 496
 497 /* Forward the frame through all devices except:
 498  * - Back through the receiving device
 499  * - If it's a HSR frame: through a device where it has passed before
 500  * - if it's a PRP frame: through another PRP slave device (no bridge)
 501  * - To the local HSR master only if the frame is directly addressed to it, or
 502  *   a non-supervision multicast or broadcast frame.
 503  *
 504  * HSR slave devices should insert a HSR tag into the frame, or forward the
 505  * frame unchanged if it's already tagged. Interlink devices should strip HSR
 506  * tags if they're of the non-HSR type (but only after duplicate discard). The
 507  * master device always strips HSR tags.
 508  */
 509 static void hsr_forward_do(struct hsr_frame_info *frame)
 510 {
 511         struct hsr_port *port;
 512         struct sk_buff *skb;
 513         bool sent = false;
 514
 515         hsr_for_each_port(frame->port_rcv->hsr, port) {
 516                 struct hsr_priv *hsr = port->hsr;
 517                 /* Don't send frame back the way it came */
 518                 if (port == frame->port_rcv)
 519                         continue;
 520
 521                 /* Don't deliver locally unless we should */
 522                 if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
 523                         continue;
 524
 525                 /* Deliver frames directly addressed to us to master only */
 526                 if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
 527                         continue;
 528
 529                 /* If hardware duplicate generation is enabled, only send out
 530                  * one port.
 531                  */
 532                 if ((port->dev->features & NETIF_F_HW_HSR_DUP) && sent)
 533                         continue;
 534
 535                 /* Don't send frame over port where it has been sent before.
 536                  * Also for SAN, this shouldn't be done.
 537                  */
 538                 if (!frame->is_from_san &&
 539                     hsr_register_frame_out(port, frame->node_src,
 540                                            frame->sequence_nr))
 541                         continue;
 542
 543                 if (frame->is_supervision && port->type == HSR_PT_MASTER &&
 544                     !frame->is_proxy_supervision) {
 545                         hsr_handle_sup_frame(frame);
 546                         continue;
 547                 }
 548
 549                 /* Check if frame is to be dropped. Eg. for PRP no forward
 550                  * between ports, or sending HSR supervision to RedBox.
 551                  */
 552                 if (hsr->proto_ops->drop_frame &&
 553                     hsr->proto_ops->drop_frame(frame, port))
 554                         continue;
 555
 556                 if (port->type == HSR_PT_SLAVE_A ||
 557                     port->type == HSR_PT_SLAVE_B)
 558                         skb = hsr->proto_ops->create_tagged_frame(frame, port);
 559                 else
 560                         skb = hsr->proto_ops->get_untagged_frame(frame, port);
 561
 562                 if (!skb) {
 563                         frame->port_rcv->dev->stats.rx_dropped++;
 564                         continue;
 565                 }
 566
 567                 skb->dev = port->dev;
 568                 if (port->type == HSR_PT_MASTER) {
 569                         hsr_deliver_master(skb, port->dev, frame->node_src);
 570                 } else {
 571                         if (!hsr_xmit(skb, port, frame))
 572                                 if (port->type == HSR_PT_SLAVE_A ||
 573                                     port->type == HSR_PT_SLAVE_B)
 574                                         sent = true;
 575                 }
 576         }
 577 }
 578
 579 static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
 580                              struct hsr_frame_info *frame)
 581 {
 582         if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {
 583                 frame->is_local_exclusive = true;
 584                 skb->pkt_type = PACKET_HOST;
 585         } else {
 586                 frame->is_local_exclusive = false;
 587         }
 588
 589         if (skb->pkt_type == PACKET_HOST ||
 590             skb->pkt_type == PACKET_MULTICAST ||
 591             skb->pkt_type == PACKET_BROADCAST) {
 592                 frame->is_local_dest = true;
 593         } else {
 594                 frame->is_local_dest = false;
 595         }
 596 }
 597
 598 static void handle_std_frame(struct sk_buff *skb,
 599                              struct hsr_frame_info *frame)
 600 {
 601         struct hsr_port *port = frame->port_rcv;
 602         struct hsr_priv *hsr = port->hsr;
 603
 604         frame->skb_hsr = NULL;
 605         frame->skb_prp = NULL;
 606         frame->skb_std = skb;
 607
 608         if (port->type != HSR_PT_MASTER)
 609                 frame->is_from_san = true;
 610
 611         if (port->type == HSR_PT_MASTER ||
 612             port->type == HSR_PT_INTERLINK) {
 613                 /* Sequence nr for the master/interlink node */
 614                 lockdep_assert_held(&hsr->seqnr_lock);
 615                 frame->sequence_nr = hsr->sequence_nr;
 616                 hsr->sequence_nr++;
 617         }
 618 }
 619
 620 int hsr_fill_frame_info(__be16 proto, struct sk_buff *skb,
 621                         struct hsr_frame_info *frame)
 622 {
 623         struct hsr_port *port = frame->port_rcv;
 624         struct hsr_priv *hsr = port->hsr;
 625
 626         /* HSRv0 supervisory frames double as a tag so treat them as tagged. */
 627         if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) ||
 628             proto == htons(ETH_P_HSR)) {
 629                 /* Check if skb contains hsr_ethhdr */
 630                 if (skb->mac_len < sizeof(struct hsr_ethhdr))
 631                         return -EINVAL;
 632
 633                 /* HSR tagged frame :- Data or Supervision */
 634                 frame->skb_std = NULL;
 635                 frame->skb_prp = NULL;
 636                 frame->skb_hsr = skb;
 637                 frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
 638                 return 0;
 639         }
 640
 641         /* Standard frame or PRP from master port */
 642         handle_std_frame(skb, frame);
 643
 644         return 0;
 645 }
 646
 647 int prp_fill_frame_info(__be16 proto, struct sk_buff *skb,
 648                         struct hsr_frame_info *frame)
 649 {
 650         /* Supervision frame */
 651         struct prp_rct *rct = skb_get_PRP_rct(skb);
 652
 653         if (rct &&
 654             prp_check_lsdu_size(skb, rct, frame->is_supervision)) {
 655                 frame->skb_hsr = NULL;
 656                 frame->skb_std = NULL;
 657                 frame->skb_prp = skb;
 658                 frame->sequence_nr = prp_get_skb_sequence_nr(rct);
 659                 return 0;
 660         }
 661         handle_std_frame(skb, frame);
 662
 663         return 0;
 664 }
 665
 666 static int fill_frame_info(struct hsr_frame_info *frame,
 667                            struct sk_buff *skb, struct hsr_port *port)
 668 {
 669         struct hsr_priv *hsr = port->hsr;
 670         struct hsr_vlan_ethhdr *vlan_hdr;
 671         struct list_head *n_db;
 672         struct ethhdr *ethhdr;
 673         __be16 proto;
 674         int ret;
 675
 676         /* Check if skb contains ethhdr */
 677         if (skb->mac_len < sizeof(struct ethhdr))
 678                 return -EINVAL;
 679
 680         memset(frame, 0, sizeof(*frame));
 681         frame->is_supervision = is_supervision_frame(port->hsr, skb);
 682         if (frame->is_supervision && hsr->redbox)
 683                 frame->is_proxy_supervision =
 684                         is_proxy_supervision_frame(port->hsr, skb);
 685
 686         n_db = &hsr->node_db;
 687         if (port->type == HSR_PT_INTERLINK)
 688                 n_db = &hsr->proxy_node_db;
 689
 690         frame->node_src = hsr_get_node(port, n_db, skb,
 691                                        frame->is_supervision, port->type);
 692         if (!frame->node_src)
 693                 return -1; /* Unknown node and !is_supervision, or no mem */
 694
 695         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 696         frame->is_vlan = false;
 697         proto = ethhdr->h_proto;
 698
 699         if (proto == htons(ETH_P_8021Q))
 700                 frame->is_vlan = true;
 701
 702         if (frame->is_vlan) {
 703                 vlan_hdr = (struct hsr_vlan_ethhdr *)ethhdr;
 704                 proto = vlan_hdr->vlanhdr.h_vlan_encapsulated_proto;
 705         }
 706
 707         frame->is_from_san = false;
 708         frame->port_rcv = port;
 709         ret = hsr->proto_ops->fill_frame_info(proto, skb, frame);
 710         if (ret)
 711                 return ret;
 712
 713         check_local_dest(port->hsr, skb, frame);
 714
 715         return 0;
 716 }
 717
 718 /* Must be called holding rcu read lock (because of the port parameter) */
 719 void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
 720 {
 721         struct hsr_frame_info frame;
 722
 723         rcu_read_lock();
 724         if (fill_frame_info(&frame, skb, port) < 0)
 725                 goto out_drop;
 726
 727         hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
 728         hsr_forward_do(&frame);
 729         rcu_read_unlock();
 730         /* Gets called for ingress frames as well as egress from master port.
 731          * So check and increment stats for master port only here.
 732          */
 733         if (port->type == HSR_PT_MASTER || port->type == HSR_PT_INTERLINK) {
 734                 port->dev->stats.tx_packets++;
 735                 port->dev->stats.tx_bytes += skb->len;
 736         }
 737
 738         kfree_skb(frame.skb_hsr);
 739         kfree_skb(frame.skb_prp);
 740         kfree_skb(frame.skb_std);
 741         return;
 742
 743 out_drop:
 744         rcu_read_unlock();
 745         port->dev->stats.tx_dropped++;
 746         kfree_skb(skb);
 747 }