1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */ 3 4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 5 6 #include <linux/etherdevice.h> 7 #include <linux/ip.h> 8 #include <linux/ipv6.h> 9 #include <linux/udp.h> 10 #include <linux/in.h> 11 #include <linux/if_arp.h> 12 #include <linux/if_ether.h> 13 #include <linux/if_vlan.h> 14 #include <linux/in6.h> 15 #include <linux/tcp.h> 16 #include <linux/icmp.h> 17 #include <linux/icmpv6.h> 18 #include <linux/uaccess.h> 19 #include <linux/errno.h> 20 #include <net/ndisc.h> 21 22 #include "gdm_lte.h" 23 #include "netlink_k.h" 24 #include "hci.h" 25 #include "hci_packet.h" 26 #include "gdm_endian.h" 27 28 /* 29 * Netlink protocol number 30 */ 31 #define NETLINK_LTE 30 32 33 /* 34 * Default MTU Size 35 */ 36 #define DEFAULT_MTU_SIZE 1500 37 38 #define IP_VERSION_4 4 39 #define IP_VERSION_6 6 40 41 static struct { 42 int ref_cnt; 43 struct sock *sock; 44 } lte_event; 45 46 static struct device_type wwan_type = { 47 .name = "wwan", 48 }; 49 50 static int gdm_lte_open(struct net_device *dev) 51 { 52 netif_start_queue(dev); 53 return 0; 54 } 55 56 static int gdm_lte_close(struct net_device *dev) 57 { 58 netif_stop_queue(dev); 59 return 0; 60 } 61 62 static int gdm_lte_set_config(struct net_device *dev, struct ifmap *map) 63 { 64 if (dev->flags & IFF_UP) 65 return -EBUSY; 66 return 0; 67 } 68 69 static void tx_complete(void *arg) 70 { 71 struct nic *nic = arg; 72 73 if (netif_queue_stopped(nic->netdev)) 74 netif_wake_queue(nic->netdev); 75 } 76 77 static int gdm_lte_rx(struct sk_buff *skb, struct nic *nic, int nic_type) 78 { 79 int ret, len; 80 81 len = skb->len + ETH_HLEN; 82 ret = netif_rx(skb); 83 if (ret == NET_RX_DROP) { 84 nic->stats.rx_dropped++; 85 } else { 86 nic->stats.rx_packets++; 87 nic->stats.rx_bytes += len; 88 } 89 90 return 0; 91 } 92 93 static int gdm_lte_emulate_arp(struct sk_buff *skb_in, u32 nic_type) 94 { 95 struct nic *nic = netdev_priv(skb_in->dev); 96 struct sk_buff *skb_out; 97 struct ethhdr eth; 98 struct vlan_ethhdr vlan_eth; 99 struct arphdr *arp_in; 100 struct arphdr *arp_out; 101 struct arpdata { 102 u8 ar_sha[ETH_ALEN]; 103 u8 ar_sip[4]; 104 u8 ar_tha[ETH_ALEN]; 105 u8 ar_tip[4]; 106 }; 107 struct arpdata *arp_data_in; 108 struct arpdata *arp_data_out; 109 u8 arp_temp[60]; 110 void *mac_header_data; 111 u32 mac_header_len; 112 113 /* Check for skb->len, discard if empty */ 114 if (skb_in->len == 0) 115 return -ENODATA; 116 117 /* Format the mac header so that it can be put to skb */ 118 if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) { 119 memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr)); 120 mac_header_data = &vlan_eth; 121 mac_header_len = VLAN_ETH_HLEN; 122 } else { 123 memcpy(ð, skb_in->data, sizeof(struct ethhdr)); 124 mac_header_data = ð 125 mac_header_len = ETH_HLEN; 126 } 127 128 /* Get the pointer of the original request */ 129 arp_in = (struct arphdr *)(skb_in->data + mac_header_len); 130 arp_data_in = (struct arpdata *)(skb_in->data + mac_header_len + 131 sizeof(struct arphdr)); 132 133 /* Get the pointer of the outgoing response */ 134 arp_out = (struct arphdr *)arp_temp; 135 arp_data_out = (struct arpdata *)(arp_temp + sizeof(struct arphdr)); 136 137 /* Copy the arp header */ 138 memcpy(arp_out, arp_in, sizeof(struct arphdr)); 139 arp_out->ar_op = htons(ARPOP_REPLY); 140 141 /* Copy the arp payload: based on 2 bytes of mac and fill the IP */ 142 arp_data_out->ar_sha[0] = arp_data_in->ar_sha[0]; 143 arp_data_out->ar_sha[1] = arp_data_in->ar_sha[1]; 144 memcpy(&arp_data_out->ar_sha[2], &arp_data_in->ar_tip[0], 4); 145 memcpy(&arp_data_out->ar_sip[0], &arp_data_in->ar_tip[0], 4); 146 memcpy(&arp_data_out->ar_tha[0], &arp_data_in->ar_sha[0], 6); 147 memcpy(&arp_data_out->ar_tip[0], &arp_data_in->ar_sip[0], 4); 148 149 /* Fill the destination mac with source mac of the received packet */ 150 memcpy(mac_header_data, mac_header_data + ETH_ALEN, ETH_ALEN); 151 /* Fill the source mac with nic's source mac */ 152 memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN); 153 154 /* Alloc skb and reserve align */ 155 skb_out = dev_alloc_skb(skb_in->len); 156 if (!skb_out) 157 return -ENOMEM; 158 skb_reserve(skb_out, NET_IP_ALIGN); 159 160 skb_put_data(skb_out, mac_header_data, mac_header_len); 161 skb_put_data(skb_out, arp_out, sizeof(struct arphdr)); 162 skb_put_data(skb_out, arp_data_out, sizeof(struct arpdata)); 163 164 skb_out->protocol = ((struct ethhdr *)mac_header_data)->h_proto; 165 skb_out->dev = skb_in->dev; 166 skb_reset_mac_header(skb_out); 167 skb_pull(skb_out, ETH_HLEN); 168 169 gdm_lte_rx(skb_out, nic, nic_type); 170 171 return 0; 172 } 173 174 static __sum16 icmp6_checksum(struct ipv6hdr *ipv6, u16 *ptr, int len) 175 { 176 unsigned short *w; 177 __wsum sum = 0; 178 int i; 179 u16 pa; 180 181 union { 182 struct { 183 u8 ph_src[16]; 184 u8 ph_dst[16]; 185 u32 ph_len; 186 u8 ph_zero[3]; 187 u8 ph_nxt; 188 } ph __packed; 189 u16 pa[20]; 190 } pseudo_header; 191 192 memset(&pseudo_header, 0, sizeof(pseudo_header)); 193 memcpy(&pseudo_header.ph.ph_src, &ipv6->saddr.in6_u.u6_addr8, 16); 194 memcpy(&pseudo_header.ph.ph_dst, &ipv6->daddr.in6_u.u6_addr8, 16); 195 pseudo_header.ph.ph_len = be16_to_cpu(ipv6->payload_len); 196 pseudo_header.ph.ph_nxt = ipv6->nexthdr; 197 198 for (i = 0; i < ARRAY_SIZE(pseudo_header.pa); i++) { 199 pa = pseudo_header.pa[i]; 200 sum = csum_add(sum, csum_unfold((__force __sum16)pa)); 201 } 202 203 w = ptr; 204 while (len > 1) { 205 sum = csum_add(sum, csum_unfold((__force __sum16)*w++)); 206 len -= 2; 207 } 208 209 return csum_fold(sum); 210 } 211 212 static int gdm_lte_emulate_ndp(struct sk_buff *skb_in, u32 nic_type) 213 { 214 struct nic *nic = netdev_priv(skb_in->dev); 215 struct sk_buff *skb_out; 216 struct ethhdr eth; 217 struct vlan_ethhdr vlan_eth; 218 struct neighbour_advertisement { 219 u8 target_address[16]; 220 u8 type; 221 u8 length; 222 u8 link_layer_address[6]; 223 }; 224 struct neighbour_advertisement na; 225 struct neighbour_solicitation { 226 u8 target_address[16]; 227 }; 228 struct neighbour_solicitation *ns; 229 struct ipv6hdr *ipv6_in; 230 struct ipv6hdr ipv6_out; 231 struct icmp6hdr *icmp6_in; 232 struct icmp6hdr icmp6_out; 233 234 void *mac_header_data; 235 u32 mac_header_len; 236 237 /* Format the mac header so that it can be put to skb */ 238 if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) { 239 memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr)); 240 if (ntohs(vlan_eth.h_vlan_encapsulated_proto) != ETH_P_IPV6) 241 return -EPROTONOSUPPORT; 242 mac_header_data = &vlan_eth; 243 mac_header_len = VLAN_ETH_HLEN; 244 } else { 245 memcpy(ð, skb_in->data, sizeof(struct ethhdr)); 246 if (ntohs(eth.h_proto) != ETH_P_IPV6) 247 return -EPROTONOSUPPORT; 248 mac_header_data = ð 249 mac_header_len = ETH_HLEN; 250 } 251 252 /* Check if this is IPv6 ICMP packet */ 253 ipv6_in = (struct ipv6hdr *)(skb_in->data + mac_header_len); 254 if (ipv6_in->version != 6 || ipv6_in->nexthdr != IPPROTO_ICMPV6) 255 return -EPROTONOSUPPORT; 256 257 /* Check if this is NDP packet */ 258 icmp6_in = (struct icmp6hdr *)(skb_in->data + mac_header_len + 259 sizeof(struct ipv6hdr)); 260 if (icmp6_in->icmp6_type == NDISC_ROUTER_SOLICITATION) { /* Check RS */ 261 return -EPROTONOSUPPORT; 262 } else if (icmp6_in->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { 263 /* Check NS */ 264 u8 icmp_na[sizeof(struct icmp6hdr) + 265 sizeof(struct neighbour_advertisement)]; 266 u8 zero_addr8[16] = {0,}; 267 268 if (memcmp(ipv6_in->saddr.in6_u.u6_addr8, zero_addr8, 16) == 0) 269 /* Duplicate Address Detection: Source IP is all zero */ 270 return 0; 271 272 icmp6_out.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 273 icmp6_out.icmp6_code = 0; 274 icmp6_out.icmp6_cksum = 0; 275 /* R=0, S=1, O=1 */ 276 icmp6_out.icmp6_dataun.un_data32[0] = htonl(0x60000000); 277 278 ns = (struct neighbour_solicitation *) 279 (skb_in->data + mac_header_len + 280 sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr)); 281 memcpy(&na.target_address, ns->target_address, 16); 282 na.type = 0x02; 283 na.length = 1; 284 na.link_layer_address[0] = 0x00; 285 na.link_layer_address[1] = 0x0a; 286 na.link_layer_address[2] = 0x3b; 287 na.link_layer_address[3] = 0xaf; 288 na.link_layer_address[4] = 0x63; 289 na.link_layer_address[5] = 0xc7; 290 291 memcpy(&ipv6_out, ipv6_in, sizeof(struct ipv6hdr)); 292 memcpy(ipv6_out.saddr.in6_u.u6_addr8, &na.target_address, 16); 293 memcpy(ipv6_out.daddr.in6_u.u6_addr8, 294 ipv6_in->saddr.in6_u.u6_addr8, 16); 295 ipv6_out.payload_len = htons(sizeof(struct icmp6hdr) + 296 sizeof(struct neighbour_advertisement)); 297 298 memcpy(icmp_na, &icmp6_out, sizeof(struct icmp6hdr)); 299 memcpy(icmp_na + sizeof(struct icmp6hdr), &na, 300 sizeof(struct neighbour_advertisement)); 301 302 icmp6_out.icmp6_cksum = icmp6_checksum(&ipv6_out, 303 (u16 *)icmp_na, 304 sizeof(icmp_na)); 305 } else { 306 return -EINVAL; 307 } 308 309 /* Fill the destination mac with source mac of the received packet */ 310 memcpy(mac_header_data, mac_header_data + ETH_ALEN, ETH_ALEN); 311 /* Fill the source mac with nic's source mac */ 312 memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN); 313 314 /* Alloc skb and reserve align */ 315 skb_out = dev_alloc_skb(skb_in->len); 316 if (!skb_out) 317 return -ENOMEM; 318 skb_reserve(skb_out, NET_IP_ALIGN); 319 320 skb_put_data(skb_out, mac_header_data, mac_header_len); 321 skb_put_data(skb_out, &ipv6_out, sizeof(struct ipv6hdr)); 322 skb_put_data(skb_out, &icmp6_out, sizeof(struct icmp6hdr)); 323 skb_put_data(skb_out, &na, sizeof(struct neighbour_advertisement)); 324 325 skb_out->protocol = ((struct ethhdr *)mac_header_data)->h_proto; 326 skb_out->dev = skb_in->dev; 327 skb_reset_mac_header(skb_out); 328 skb_pull(skb_out, ETH_HLEN); 329 330 gdm_lte_rx(skb_out, nic, nic_type); 331 332 return 0; 333 } 334 335 static s32 gdm_lte_tx_nic_type(struct net_device *dev, struct sk_buff *skb) 336 { 337 struct nic *nic = netdev_priv(dev); 338 struct ethhdr *eth; 339 struct vlan_ethhdr *vlan_eth; 340 struct iphdr *ip; 341 struct ipv6hdr *ipv6; 342 int mac_proto; 343 void *network_data; 344 u32 nic_type; 345 346 /* NIC TYPE is based on the nic_id of this net_device */ 347 nic_type = 0x00000010 | nic->nic_id; 348 349 /* Get ethernet protocol */ 350 eth = (struct ethhdr *)skb->data; 351 if (ntohs(eth->h_proto) == ETH_P_8021Q) { 352 vlan_eth = (struct vlan_ethhdr *)skb->data; 353 mac_proto = ntohs(vlan_eth->h_vlan_encapsulated_proto); 354 network_data = skb->data + VLAN_ETH_HLEN; 355 nic_type |= NIC_TYPE_F_VLAN; 356 } else { 357 mac_proto = ntohs(eth->h_proto); 358 network_data = skb->data + ETH_HLEN; 359 } 360 361 /* Process packet for nic type */ 362 switch (mac_proto) { 363 case ETH_P_ARP: 364 nic_type |= NIC_TYPE_ARP; 365 break; 366 case ETH_P_IP: 367 nic_type |= NIC_TYPE_F_IPV4; 368 ip = network_data; 369 370 /* Check DHCPv4 */ 371 if (ip->protocol == IPPROTO_UDP) { 372 struct udphdr *udp = 373 network_data + sizeof(struct iphdr); 374 if (ntohs(udp->dest) == 67 || ntohs(udp->dest) == 68) 375 nic_type |= NIC_TYPE_F_DHCP; 376 } 377 break; 378 case ETH_P_IPV6: 379 nic_type |= NIC_TYPE_F_IPV6; 380 ipv6 = network_data; 381 382 if (ipv6->nexthdr == IPPROTO_ICMPV6) /* Check NDP request */ { 383 struct icmp6hdr *icmp6 = 384 network_data + sizeof(struct ipv6hdr); 385 if (icmp6->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 386 nic_type |= NIC_TYPE_ICMPV6; 387 } else if (ipv6->nexthdr == IPPROTO_UDP) /* Check DHCPv6 */ { 388 struct udphdr *udp = 389 network_data + sizeof(struct ipv6hdr); 390 if (ntohs(udp->dest) == 546 || ntohs(udp->dest) == 547) 391 nic_type |= NIC_TYPE_F_DHCP; 392 } 393 break; 394 default: 395 break; 396 } 397 398 return nic_type; 399 } 400 401 static netdev_tx_t gdm_lte_tx(struct sk_buff *skb, struct net_device *dev) 402 { 403 struct nic *nic = netdev_priv(dev); 404 u32 nic_type; 405 void *data_buf; 406 int data_len; 407 int idx; 408 int ret = 0; 409 410 nic_type = gdm_lte_tx_nic_type(dev, skb); 411 if (nic_type == 0) { 412 netdev_err(dev, "tx - invalid nic_type\n"); 413 return -EMEDIUMTYPE; 414 } 415 416 if (nic_type & NIC_TYPE_ARP) { 417 if (gdm_lte_emulate_arp(skb, nic_type) == 0) { 418 dev_kfree_skb(skb); 419 return 0; 420 } 421 } 422 423 if (nic_type & NIC_TYPE_ICMPV6) { 424 if (gdm_lte_emulate_ndp(skb, nic_type) == 0) { 425 dev_kfree_skb(skb); 426 return 0; 427 } 428 } 429 430 /* 431 * Need byte shift (that is, remove VLAN tag) if there is one 432 * For the case of ARP, this breaks the offset as vlan_ethhdr+4 433 * is treated as ethhdr However, it shouldn't be a problem as 434 * the response starts from arp_hdr and ethhdr is created by this 435 * driver based on the NIC mac 436 */ 437 if (nic_type & NIC_TYPE_F_VLAN) { 438 struct vlan_ethhdr *vlan_eth = (struct vlan_ethhdr *)skb->data; 439 440 nic->vlan_id = ntohs(vlan_eth->h_vlan_TCI) & VLAN_VID_MASK; 441 data_buf = skb->data + (VLAN_ETH_HLEN - ETH_HLEN); 442 data_len = skb->len - (VLAN_ETH_HLEN - ETH_HLEN); 443 } else { 444 nic->vlan_id = 0; 445 data_buf = skb->data; 446 data_len = skb->len; 447 } 448 449 /* If it is a ICMPV6 packet, clear all the other bits : 450 * for backward compatibility with the firmware 451 */ 452 if (nic_type & NIC_TYPE_ICMPV6) 453 nic_type = NIC_TYPE_ICMPV6; 454 455 /* If it is not a dhcp packet, clear all the flag bits : 456 * original NIC, otherwise the special flag (IPVX | DHCP) 457 */ 458 if (!(nic_type & NIC_TYPE_F_DHCP)) 459 nic_type &= NIC_TYPE_MASK; 460 461 ret = sscanf(dev->name, "lte%d", &idx); 462 if (ret != 1) { 463 dev_kfree_skb(skb); 464 return -EINVAL; 465 } 466 467 ret = nic->phy_dev->send_sdu_func(nic->phy_dev->priv_dev, 468 data_buf, data_len, 469 nic->pdn_table.dft_eps_id, 0, 470 tx_complete, nic, idx, 471 nic_type); 472 473 if (ret == TX_NO_BUFFER || ret == TX_NO_SPC) { 474 netif_stop_queue(dev); 475 if (ret == TX_NO_BUFFER) 476 ret = 0; 477 else 478 ret = -ENOSPC; 479 } else if (ret == TX_NO_DEV) { 480 ret = -ENODEV; 481 } 482 483 /* Updates tx stats */ 484 if (ret) { 485 nic->stats.tx_dropped++; 486 } else { 487 nic->stats.tx_packets++; 488 nic->stats.tx_bytes += data_len; 489 } 490 dev_kfree_skb(skb); 491 492 return 0; 493 } 494 495 static struct net_device_stats *gdm_lte_stats(struct net_device *dev) 496 { 497 struct nic *nic = netdev_priv(dev); 498 499 return &nic->stats; 500 } 501 502 static int gdm_lte_event_send(struct net_device *dev, char *buf, int len) 503 { 504 struct phy_dev *phy_dev = ((struct nic *)netdev_priv(dev))->phy_dev; 505 struct hci_packet *hci = (struct hci_packet *)buf; 506 int length; 507 int idx; 508 int ret; 509 510 ret = sscanf(dev->name, "lte%d", &idx); 511 if (ret != 1) 512 return -EINVAL; 513 514 length = gdm_dev16_to_cpu(phy_dev->get_endian(phy_dev->priv_dev), 515 hci->len) + HCI_HEADER_SIZE; 516 return netlink_send(lte_event.sock, idx, 0, buf, length, dev); 517 } 518 519 static void gdm_lte_event_rcv(struct net_device *dev, u16 type, 520 void *msg, int len) 521 { 522 struct nic *nic = netdev_priv(dev); 523 524 nic->phy_dev->send_hci_func(nic->phy_dev->priv_dev, msg, len, NULL, 525 NULL); 526 } 527 528 int gdm_lte_event_init(void) 529 { 530 if (lte_event.ref_cnt == 0) 531 lte_event.sock = netlink_init(NETLINK_LTE, gdm_lte_event_rcv); 532 533 if (lte_event.sock) { 534 lte_event.ref_cnt++; 535 return 0; 536 } 537 538 pr_err("event init failed\n"); 539 return -ENODATA; 540 } 541 542 void gdm_lte_event_exit(void) 543 { 544 if (lte_event.sock && --lte_event.ref_cnt == 0) { 545 sock_release(lte_event.sock->sk_socket); 546 lte_event.sock = NULL; 547 } 548 } 549 550 static int find_dev_index(u32 nic_type) 551 { 552 u8 index; 553 554 index = (u8)(nic_type & 0x0000000f); 555 if (index >= MAX_NIC_TYPE) 556 return -EINVAL; 557 558 return index; 559 } 560 561 static void gdm_lte_netif_rx(struct net_device *dev, char *buf, 562 int len, int flagged_nic_type) 563 { 564 u32 nic_type; 565 struct nic *nic; 566 struct sk_buff *skb; 567 struct ethhdr eth; 568 struct vlan_ethhdr vlan_eth; 569 void *mac_header_data; 570 u32 mac_header_len; 571 char ip_version = 0; 572 573 nic_type = flagged_nic_type & NIC_TYPE_MASK; 574 nic = netdev_priv(dev); 575 576 if (flagged_nic_type & NIC_TYPE_F_DHCP) { 577 /* Change the destination mac address 578 * with the one requested the IP 579 */ 580 if (flagged_nic_type & NIC_TYPE_F_IPV4) { 581 struct dhcp_packet { 582 u8 op; /* BOOTREQUEST or BOOTREPLY */ 583 u8 htype; /* hardware address type. 584 * 1 = 10mb ethernet 585 */ 586 u8 hlen; /* hardware address length */ 587 u8 hops; /* used by relay agents only */ 588 u32 xid; /* unique id */ 589 u16 secs; /* elapsed since client began 590 * acquisition/renewal 591 */ 592 u16 flags; /* only one flag so far: */ 593 #define BROADCAST_FLAG 0x8000 594 /* "I need broadcast replies" */ 595 u32 ciaddr; /* client IP (if client is in 596 * BOUND, RENEW or REBINDING state) 597 */ 598 u32 yiaddr; /* 'your' (client) IP address */ 599 /* IP address of next server to use in 600 * bootstrap, returned in DHCPOFFER, 601 * DHCPACK by server 602 */ 603 u32 siaddr_nip; 604 u32 gateway_nip; /* relay agent IP address */ 605 u8 chaddr[16]; /* link-layer client hardware 606 * address (MAC) 607 */ 608 u8 sname[64]; /* server host name (ASCIZ) */ 609 u8 file[128]; /* boot file name (ASCIZ) */ 610 u32 cookie; /* fixed first four option 611 * bytes (99,130,83,99 dec) 612 */ 613 } __packed; 614 int offset = sizeof(struct iphdr) + 615 sizeof(struct udphdr) + 616 offsetof(struct dhcp_packet, chaddr); 617 if (offset + ETH_ALEN > len) 618 return; 619 ether_addr_copy(nic->dest_mac_addr, buf + offset); 620 } 621 } 622 623 if (nic->vlan_id > 0) { 624 mac_header_data = (void *)&vlan_eth; 625 mac_header_len = VLAN_ETH_HLEN; 626 } else { 627 mac_header_data = (void *)ð 628 mac_header_len = ETH_HLEN; 629 } 630 631 /* Format the data so that it can be put to skb */ 632 ether_addr_copy(mac_header_data, nic->dest_mac_addr); 633 memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN); 634 635 vlan_eth.h_vlan_TCI = htons(nic->vlan_id); 636 vlan_eth.h_vlan_proto = htons(ETH_P_8021Q); 637 638 if (nic_type == NIC_TYPE_ARP) { 639 /* Should be response: Only happens because 640 * there was a request from the host 641 */ 642 eth.h_proto = htons(ETH_P_ARP); 643 vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_ARP); 644 } else { 645 ip_version = buf[0] >> 4; 646 if (ip_version == IP_VERSION_4) { 647 eth.h_proto = htons(ETH_P_IP); 648 vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_IP); 649 } else if (ip_version == IP_VERSION_6) { 650 eth.h_proto = htons(ETH_P_IPV6); 651 vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_IPV6); 652 } else { 653 netdev_err(dev, "Unknown IP version %d\n", ip_version); 654 return; 655 } 656 } 657 658 /* Alloc skb and reserve align */ 659 skb = dev_alloc_skb(len + mac_header_len + NET_IP_ALIGN); 660 if (!skb) 661 return; 662 skb_reserve(skb, NET_IP_ALIGN); 663 664 skb_put_data(skb, mac_header_data, mac_header_len); 665 skb_put_data(skb, buf, len); 666 667 skb->protocol = ((struct ethhdr *)mac_header_data)->h_proto; 668 skb->dev = dev; 669 skb_reset_mac_header(skb); 670 skb_pull(skb, ETH_HLEN); 671 672 gdm_lte_rx(skb, nic, nic_type); 673 } 674 675 static void gdm_lte_multi_sdu_pkt(struct phy_dev *phy_dev, char *buf, int len) 676 { 677 struct net_device *dev; 678 struct multi_sdu *multi_sdu = (struct multi_sdu *)buf; 679 struct sdu *sdu = NULL; 680 u8 endian = phy_dev->get_endian(phy_dev->priv_dev); 681 u8 *data = (u8 *)multi_sdu->data; 682 int copied; 683 u16 i = 0; 684 u16 num_packet; 685 u16 hci_len; 686 u16 cmd_evt; 687 u32 nic_type; 688 int index; 689 690 num_packet = gdm_dev16_to_cpu(endian, multi_sdu->num_packet); 691 692 for (i = 0; i < num_packet; i++) { 693 copied = data - multi_sdu->data; 694 if (len < copied + sizeof(*sdu)) { 695 pr_err("rx prevent buffer overflow"); 696 return; 697 } 698 699 sdu = (struct sdu *)data; 700 701 cmd_evt = gdm_dev16_to_cpu(endian, sdu->cmd_evt); 702 hci_len = gdm_dev16_to_cpu(endian, sdu->len); 703 nic_type = gdm_dev32_to_cpu(endian, sdu->nic_type); 704 705 if (cmd_evt != LTE_RX_SDU) { 706 pr_err("rx sdu wrong hci %04x\n", cmd_evt); 707 return; 708 } 709 if (hci_len < 12 || 710 len < copied + sizeof(*sdu) + (hci_len - 12)) { 711 pr_err("rx sdu invalid len %d\n", hci_len); 712 return; 713 } 714 715 index = find_dev_index(nic_type); 716 if (index < 0) { 717 pr_err("rx sdu invalid nic_type :%x\n", nic_type); 718 return; 719 } 720 dev = phy_dev->dev[index]; 721 gdm_lte_netif_rx(dev, (char *)sdu->data, 722 (int)(hci_len - 12), nic_type); 723 724 data += ((hci_len + 3) & 0xfffc) + HCI_HEADER_SIZE; 725 } 726 } 727 728 static void gdm_lte_pdn_table(struct net_device *dev, char *buf, int len) 729 { 730 struct nic *nic = netdev_priv(dev); 731 struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf; 732 u8 ed = nic->phy_dev->get_endian(nic->phy_dev->priv_dev); 733 734 if (!pdn_table->activate) { 735 memset(&nic->pdn_table, 0x00, sizeof(struct pdn_table)); 736 netdev_info(dev, "pdn deactivated\n"); 737 738 return; 739 } 740 741 nic->pdn_table.activate = pdn_table->activate; 742 nic->pdn_table.dft_eps_id = gdm_dev32_to_cpu(ed, pdn_table->dft_eps_id); 743 nic->pdn_table.nic_type = gdm_dev32_to_cpu(ed, pdn_table->nic_type); 744 745 netdev_info(dev, "pdn activated, nic_type=0x%x\n", 746 nic->pdn_table.nic_type); 747 } 748 749 static int gdm_lte_receive_pkt(struct phy_dev *phy_dev, char *buf, int len) 750 { 751 struct hci_packet *hci = (struct hci_packet *)buf; 752 struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf; 753 struct sdu *sdu; 754 struct net_device *dev; 755 u8 endian = phy_dev->get_endian(phy_dev->priv_dev); 756 int ret = 0; 757 u16 cmd_evt; 758 u32 nic_type; 759 int index; 760 761 if (!len) 762 return ret; 763 764 cmd_evt = gdm_dev16_to_cpu(endian, hci->cmd_evt); 765 766 dev = phy_dev->dev[0]; 767 if (!dev) 768 return 0; 769 770 switch (cmd_evt) { 771 case LTE_RX_SDU: 772 sdu = (struct sdu *)hci->data; 773 nic_type = gdm_dev32_to_cpu(endian, sdu->nic_type); 774 index = find_dev_index(nic_type); 775 if (index < 0) 776 return index; 777 dev = phy_dev->dev[index]; 778 gdm_lte_netif_rx(dev, hci->data, len, nic_type); 779 break; 780 case LTE_RX_MULTI_SDU: 781 gdm_lte_multi_sdu_pkt(phy_dev, buf, len); 782 break; 783 case LTE_LINK_ON_OFF_INDICATION: 784 netdev_info(dev, "link %s\n", 785 ((struct hci_connect_ind *)buf)->connect 786 ? "on" : "off"); 787 break; 788 case LTE_PDN_TABLE_IND: 789 pdn_table = (struct hci_pdn_table_ind *)buf; 790 nic_type = gdm_dev32_to_cpu(endian, pdn_table->nic_type); 791 index = find_dev_index(nic_type); 792 if (index < 0) 793 return index; 794 dev = phy_dev->dev[index]; 795 gdm_lte_pdn_table(dev, buf, len); 796 fallthrough; 797 default: 798 ret = gdm_lte_event_send(dev, buf, len); 799 break; 800 } 801 802 return ret; 803 } 804 805 static int rx_complete(void *arg, void *data, int len, int context) 806 { 807 struct phy_dev *phy_dev = arg; 808 809 return gdm_lte_receive_pkt(phy_dev, data, len); 810 } 811 812 void start_rx_proc(struct phy_dev *phy_dev) 813 { 814 int i; 815 816 for (i = 0; i < MAX_RX_SUBMIT_COUNT; i++) 817 phy_dev->rcv_func(phy_dev->priv_dev, 818 rx_complete, phy_dev, USB_COMPLETE); 819 } 820 821 static const struct net_device_ops gdm_netdev_ops = { 822 .ndo_open = gdm_lte_open, 823 .ndo_stop = gdm_lte_close, 824 .ndo_set_config = gdm_lte_set_config, 825 .ndo_start_xmit = gdm_lte_tx, 826 .ndo_get_stats = gdm_lte_stats, 827 }; 828 829 static u8 gdm_lte_macaddr[ETH_ALEN] = {0x00, 0x0a, 0x3b, 0x00, 0x00, 0x00}; 830 831 static void form_mac_address(u8 *dev_addr, u8 *nic_src, u8 *nic_dest, 832 u8 *mac_address, u8 index) 833 { 834 /* Form the dev_addr */ 835 if (!mac_address) 836 ether_addr_copy(dev_addr, gdm_lte_macaddr); 837 else 838 ether_addr_copy(dev_addr, mac_address); 839 840 /* The last byte of the mac address 841 * should be less than or equal to 0xFC 842 */ 843 dev_addr[ETH_ALEN - 1] += index; 844 845 /* Create random nic src and copy the first 846 * 3 bytes to be the same as dev_addr 847 */ 848 eth_random_addr(nic_src); 849 memcpy(nic_src, dev_addr, 3); 850 851 /* Copy the nic_dest from dev_addr*/ 852 ether_addr_copy(nic_dest, dev_addr); 853 } 854 855 static void validate_mac_address(u8 *mac_address) 856 { 857 /* if zero address or multicast bit set, restore the default value */ 858 if (is_zero_ether_addr(mac_address) || (mac_address[0] & 0x01)) { 859 pr_err("MAC invalid, restoring default\n"); 860 memcpy(mac_address, gdm_lte_macaddr, 6); 861 } 862 } 863 864 int register_lte_device(struct phy_dev *phy_dev, 865 struct device *dev, u8 *mac_address) 866 { 867 struct nic *nic; 868 struct net_device *net; 869 char pdn_dev_name[16]; 870 u8 addr[ETH_ALEN]; 871 int ret = 0; 872 u8 index; 873 874 validate_mac_address(mac_address); 875 876 for (index = 0; index < MAX_NIC_TYPE; index++) { 877 /* Create device name lteXpdnX */ 878 sprintf(pdn_dev_name, "lte%%dpdn%d", index); 879 880 /* Allocate netdev */ 881 net = alloc_netdev(sizeof(struct nic), pdn_dev_name, 882 NET_NAME_UNKNOWN, ether_setup); 883 if (!net) { 884 ret = -ENOMEM; 885 goto err; 886 } 887 net->netdev_ops = &gdm_netdev_ops; 888 net->flags &= ~IFF_MULTICAST; 889 net->mtu = DEFAULT_MTU_SIZE; 890 891 nic = netdev_priv(net); 892 memset(nic, 0, sizeof(struct nic)); 893 nic->netdev = net; 894 nic->phy_dev = phy_dev; 895 nic->nic_id = index; 896 897 form_mac_address(addr, 898 nic->src_mac_addr, 899 nic->dest_mac_addr, 900 mac_address, 901 index); 902 eth_hw_addr_set(net, addr); 903 904 SET_NETDEV_DEV(net, dev); 905 SET_NETDEV_DEVTYPE(net, &wwan_type); 906 907 ret = register_netdev(net); 908 if (ret) 909 goto err; 910 911 netif_carrier_on(net); 912 913 phy_dev->dev[index] = net; 914 } 915 916 return 0; 917 918 err: 919 unregister_lte_device(phy_dev); 920 921 return ret; 922 } 923 924 void unregister_lte_device(struct phy_dev *phy_dev) 925 { 926 struct net_device *net; 927 int index; 928 929 for (index = 0; index < MAX_NIC_TYPE; index++) { 930 net = phy_dev->dev[index]; 931 if (!net) 932 continue; 933 934 unregister_netdev(net); 935 free_netdev(net); 936 } 937 } 938