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