drivers/staging/gdm724x/gdm

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This source file includes following definitions.
gdm_lte_open
gdm_lte_close
gdm_lte_set_config
tx_complete
gdm_lte_rx
gdm_lte_emulate_arp
icmp6_checksum
gdm_lte_emulate_ndp
gdm_lte_tx_nic_type
gdm_lte_tx
gdm_lte_stats
gdm_lte_event_send
gdm_lte_event_rcv
gdm_lte_event_init
gdm_lte_event_exit
find_dev_index
gdm_lte_netif_rx
gdm_lte_multi_sdu_pkt
gdm_lte_pdn_table
gdm_lte_receive_pkt
rx_complete
start_rx_proc
form_mac_address
validate_mac_address
register_lte_device
unregister_lte_device
   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;
  80 
  81         ret = netif_rx_ni(skb);
  82         if (ret == NET_RX_DROP) {
  83                 nic->stats.rx_dropped++;
  84         } else {
  85                 nic->stats.rx_packets++;
  86                 nic->stats.rx_bytes += skb->len + ETH_HLEN;
  87         }
  88 
  89         return 0;
  90 }
  91 
  92 static int gdm_lte_emulate_arp(struct sk_buff *skb_in, u32 nic_type)
  93 {
  94         struct nic *nic = netdev_priv(skb_in->dev);
  95         struct sk_buff *skb_out;
  96         struct ethhdr eth;
  97         struct vlan_ethhdr vlan_eth;
  98         struct arphdr *arp_in;
  99         struct arphdr *arp_out;
 100         struct arpdata {
 101                 u8 ar_sha[ETH_ALEN];
 102                 u8 ar_sip[4];
 103                 u8 ar_tha[ETH_ALEN];
 104                 u8 ar_tip[4];
 105         };
 106         struct arpdata *arp_data_in;
 107         struct arpdata *arp_data_out;
 108         u8 arp_temp[60];
 109         void *mac_header_data;
 110         u32 mac_header_len;
 111 
 112         /* Check for skb->len, discard if empty */
 113         if (skb_in->len == 0)
 114                 return -ENODATA;
 115 
 116         /* Format the mac header so that it can be put to skb */
 117         if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) {
 118                 memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr));
 119                 mac_header_data = &vlan_eth;
 120                 mac_header_len = VLAN_ETH_HLEN;
 121         } else {
 122                 memcpy(&eth, skb_in->data, sizeof(struct ethhdr));
 123                 mac_header_data = &eth;
 124                 mac_header_len = ETH_HLEN;
 125         }
 126 
 127         /* Get the pointer of the original request */
 128         arp_in = (struct arphdr *)(skb_in->data + mac_header_len);
 129         arp_data_in = (struct arpdata *)(skb_in->data + mac_header_len +
 130                                         sizeof(struct arphdr));
 131 
 132         /* Get the pointer of the outgoing response */
 133         arp_out = (struct arphdr *)arp_temp;
 134         arp_data_out = (struct arpdata *)(arp_temp + sizeof(struct arphdr));
 135 
 136         /* Copy the arp header */
 137         memcpy(arp_out, arp_in, sizeof(struct arphdr));
 138         arp_out->ar_op = htons(ARPOP_REPLY);
 139 
 140         /* Copy the arp payload: based on 2 bytes of mac and fill the IP */
 141         arp_data_out->ar_sha[0] = arp_data_in->ar_sha[0];
 142         arp_data_out->ar_sha[1] = arp_data_in->ar_sha[1];
 143         memcpy(&arp_data_out->ar_sha[2], &arp_data_in->ar_tip[0], 4);
 144         memcpy(&arp_data_out->ar_sip[0], &arp_data_in->ar_tip[0], 4);
 145         memcpy(&arp_data_out->ar_tha[0], &arp_data_in->ar_sha[0], 6);
 146         memcpy(&arp_data_out->ar_tip[0], &arp_data_in->ar_sip[0], 4);
 147 
 148         /* Fill the destination mac with source mac of the received packet */
 149         memcpy(mac_header_data, mac_header_data + ETH_ALEN, ETH_ALEN);
 150         /* Fill the source mac with nic's source mac */
 151         memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN);
 152 
 153         /* Alloc skb and reserve align */
 154         skb_out = dev_alloc_skb(skb_in->len);
 155         if (!skb_out)
 156                 return -ENOMEM;
 157         skb_reserve(skb_out, NET_IP_ALIGN);
 158 
 159         skb_put_data(skb_out, mac_header_data, mac_header_len);
 160         skb_put_data(skb_out, arp_out, sizeof(struct arphdr));
 161         skb_put_data(skb_out, arp_data_out, sizeof(struct arpdata));
 162 
 163         skb_out->protocol = ((struct ethhdr *)mac_header_data)->h_proto;
 164         skb_out->dev = skb_in->dev;
 165         skb_reset_mac_header(skb_out);
 166         skb_pull(skb_out, ETH_HLEN);
 167 
 168         gdm_lte_rx(skb_out, nic, nic_type);
 169 
 170         return 0;
 171 }
 172 
 173 static __sum16 icmp6_checksum(struct ipv6hdr *ipv6, u16 *ptr, int len)
 174 {
 175         unsigned short *w = ptr;
 176         __wsum sum = 0;
 177         int i;
 178         u16 pa;
 179 
 180         union {
 181                 struct {
 182                         u8 ph_src[16];
 183                         u8 ph_dst[16];
 184                         u32 ph_len;
 185                         u8 ph_zero[3];
 186                         u8 ph_nxt;
 187                 } ph __packed;
 188                 u16 pa[20];
 189         } pseudo_header;
 190 
 191         memset(&pseudo_header, 0, sizeof(pseudo_header));
 192         memcpy(&pseudo_header.ph.ph_src, &ipv6->saddr.in6_u.u6_addr8, 16);
 193         memcpy(&pseudo_header.ph.ph_dst, &ipv6->daddr.in6_u.u6_addr8, 16);
 194         pseudo_header.ph.ph_len = be16_to_cpu(ipv6->payload_len);
 195         pseudo_header.ph.ph_nxt = ipv6->nexthdr;
 196 
 197         w = (u16 *)&pseudo_header;
 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(&eth, skb_in->data, sizeof(struct ethhdr));
 246                 if (ntohs(eth.h_proto) != ETH_P_IPV6)
 247                         return -EPROTONOSUPPORT;
 248                 mac_header_data = &eth;
 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);
 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                         void *addr = buf + sizeof(struct iphdr) +
 615                                 sizeof(struct udphdr) +
 616                                 offsetof(struct dhcp_packet, chaddr);
 617                         ether_addr_copy(nic->dest_mac_addr, addr);
 618                 }
 619         }
 620 
 621         if (nic->vlan_id > 0) {
 622                 mac_header_data = (void *)&vlan_eth;
 623                 mac_header_len = VLAN_ETH_HLEN;
 624         } else {
 625                 mac_header_data = (void *)&eth;
 626                 mac_header_len = ETH_HLEN;
 627         }
 628 
 629         /* Format the data so that it can be put to skb */
 630         ether_addr_copy(mac_header_data, nic->dest_mac_addr);
 631         memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN);
 632 
 633         vlan_eth.h_vlan_TCI = htons(nic->vlan_id);
 634         vlan_eth.h_vlan_proto = htons(ETH_P_8021Q);
 635 
 636         if (nic_type == NIC_TYPE_ARP) {
 637                 /* Should be response: Only happens because
 638                  * there was a request from the host
 639                  */
 640                 eth.h_proto = htons(ETH_P_ARP);
 641                 vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_ARP);
 642         } else {
 643                 ip_version = buf[0] >> 4;
 644                 if (ip_version == IP_VERSION_4) {
 645                         eth.h_proto = htons(ETH_P_IP);
 646                         vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_IP);
 647                 } else if (ip_version == IP_VERSION_6) {
 648                         eth.h_proto = htons(ETH_P_IPV6);
 649                         vlan_eth.h_vlan_encapsulated_proto = htons(ETH_P_IPV6);
 650                 } else {
 651                         netdev_err(dev, "Unknown IP version %d\n", ip_version);
 652                         return;
 653                 }
 654         }
 655 
 656         /* Alloc skb and reserve align */
 657         skb = dev_alloc_skb(len + mac_header_len + NET_IP_ALIGN);
 658         if (!skb)
 659                 return;
 660         skb_reserve(skb, NET_IP_ALIGN);
 661 
 662         skb_put_data(skb, mac_header_data, mac_header_len);
 663         skb_put_data(skb, buf, len);
 664 
 665         skb->protocol = ((struct ethhdr *)mac_header_data)->h_proto;
 666         skb->dev = dev;
 667         skb_reset_mac_header(skb);
 668         skb_pull(skb, ETH_HLEN);
 669 
 670         gdm_lte_rx(skb, nic, nic_type);
 671 }
 672 
 673 static void gdm_lte_multi_sdu_pkt(struct phy_dev *phy_dev, char *buf, int len)
 674 {
 675         struct net_device *dev;
 676         struct multi_sdu *multi_sdu = (struct multi_sdu *)buf;
 677         struct sdu *sdu = NULL;
 678         u8 endian = phy_dev->get_endian(phy_dev->priv_dev);
 679         u8 *data = (u8 *)multi_sdu->data;
 680         u16 i = 0;
 681         u16 num_packet;
 682         u16 hci_len;
 683         u16 cmd_evt;
 684         u32 nic_type;
 685         int index;
 686 
 687         hci_len = gdm_dev16_to_cpu(endian, multi_sdu->len);
 688         num_packet = gdm_dev16_to_cpu(endian, multi_sdu->num_packet);
 689 
 690         for (i = 0; i < num_packet; i++) {
 691                 sdu = (struct sdu *)data;
 692 
 693                 cmd_evt  = gdm_dev16_to_cpu(endian, sdu->cmd_evt);
 694                 hci_len  = gdm_dev16_to_cpu(endian, sdu->len);
 695                 nic_type = gdm_dev32_to_cpu(endian, sdu->nic_type);
 696 
 697                 if (cmd_evt != LTE_RX_SDU) {
 698                         pr_err("rx sdu wrong hci %04x\n", cmd_evt);
 699                         return;
 700                 }
 701                 if (hci_len < 12) {
 702                         pr_err("rx sdu invalid len %d\n", hci_len);
 703                         return;
 704                 }
 705 
 706                 index = find_dev_index(nic_type);
 707                 if (index < 0) {
 708                         pr_err("rx sdu invalid nic_type :%x\n", nic_type);
 709                         return;
 710                 }
 711                 dev = phy_dev->dev[index];
 712                 gdm_lte_netif_rx(dev, (char *)sdu->data,
 713                                  (int)(hci_len - 12), nic_type);
 714 
 715                 data += ((hci_len + 3) & 0xfffc) + HCI_HEADER_SIZE;
 716         }
 717 }
 718 
 719 static void gdm_lte_pdn_table(struct net_device *dev, char *buf, int len)
 720 {
 721         struct nic *nic = netdev_priv(dev);
 722         struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf;
 723         u8 ed = nic->phy_dev->get_endian(nic->phy_dev->priv_dev);
 724 
 725         if (!pdn_table->activate) {
 726                 memset(&nic->pdn_table, 0x00, sizeof(struct pdn_table));
 727                 netdev_info(dev, "pdn deactivated\n");
 728 
 729                 return;
 730         }
 731 
 732         nic->pdn_table.activate = pdn_table->activate;
 733         nic->pdn_table.dft_eps_id = gdm_dev32_to_cpu(ed, pdn_table->dft_eps_id);
 734         nic->pdn_table.nic_type = gdm_dev32_to_cpu(ed, pdn_table->nic_type);
 735 
 736         netdev_info(dev, "pdn activated, nic_type=0x%x\n",
 737                     nic->pdn_table.nic_type);
 738 }
 739 
 740 static int gdm_lte_receive_pkt(struct phy_dev *phy_dev, char *buf, int len)
 741 {
 742         struct hci_packet *hci = (struct hci_packet *)buf;
 743         struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf;
 744         struct sdu *sdu;
 745         struct net_device *dev;
 746         u8 endian = phy_dev->get_endian(phy_dev->priv_dev);
 747         int ret = 0;
 748         u16 cmd_evt;
 749         u32 nic_type;
 750         int index;
 751 
 752         if (!len)
 753                 return ret;
 754 
 755         cmd_evt = gdm_dev16_to_cpu(endian, hci->cmd_evt);
 756 
 757         dev = phy_dev->dev[0];
 758         if (!dev)
 759                 return 0;
 760 
 761         switch (cmd_evt) {
 762         case LTE_RX_SDU:
 763                 sdu = (struct sdu *)hci->data;
 764                 nic_type = gdm_dev32_to_cpu(endian, sdu->nic_type);
 765                 index = find_dev_index(nic_type);
 766                 if (index < 0)
 767                         return index;
 768                 dev = phy_dev->dev[index];
 769                 gdm_lte_netif_rx(dev, hci->data, len, nic_type);
 770                 break;
 771         case LTE_RX_MULTI_SDU:
 772                 gdm_lte_multi_sdu_pkt(phy_dev, buf, len);
 773                 break;
 774         case LTE_LINK_ON_OFF_INDICATION:
 775                 netdev_info(dev, "link %s\n",
 776                             ((struct hci_connect_ind *)buf)->connect
 777                             ? "on" : "off");
 778                 break;
 779         case LTE_PDN_TABLE_IND:
 780                 pdn_table = (struct hci_pdn_table_ind *)buf;
 781                 nic_type = gdm_dev32_to_cpu(endian, pdn_table->nic_type);
 782                 index = find_dev_index(nic_type);
 783                 if (index < 0)
 784                         return index;
 785                 dev = phy_dev->dev[index];
 786                 gdm_lte_pdn_table(dev, buf, len);
 787                 /* Fall through */
 788         default:
 789                 ret = gdm_lte_event_send(dev, buf, len);
 790                 break;
 791         }
 792 
 793         return ret;
 794 }
 795 
 796 static int rx_complete(void *arg, void *data, int len, int context)
 797 {
 798         struct phy_dev *phy_dev = arg;
 799 
 800         return gdm_lte_receive_pkt(phy_dev, data, len);
 801 }
 802 
 803 void start_rx_proc(struct phy_dev *phy_dev)
 804 {
 805         int i;
 806 
 807         for (i = 0; i < MAX_RX_SUBMIT_COUNT; i++)
 808                 phy_dev->rcv_func(phy_dev->priv_dev,
 809                                 rx_complete, phy_dev, USB_COMPLETE);
 810 }
 811 
 812 static const struct net_device_ops gdm_netdev_ops = {
 813         .ndo_open                       = gdm_lte_open,
 814         .ndo_stop                       = gdm_lte_close,
 815         .ndo_set_config                 = gdm_lte_set_config,
 816         .ndo_start_xmit                 = gdm_lte_tx,
 817         .ndo_get_stats                  = gdm_lte_stats,
 818 };
 819 
 820 static u8 gdm_lte_macaddr[ETH_ALEN] = {0x00, 0x0a, 0x3b, 0x00, 0x00, 0x00};
 821 
 822 static void form_mac_address(u8 *dev_addr, u8 *nic_src, u8 *nic_dest,
 823                              u8 *mac_address, u8 index)
 824 {
 825         /* Form the dev_addr */
 826         if (!mac_address)
 827                 ether_addr_copy(dev_addr, gdm_lte_macaddr);
 828         else
 829                 ether_addr_copy(dev_addr, mac_address);
 830 
 831         /* The last byte of the mac address
 832          * should be less than or equal to 0xFC
 833          */
 834         dev_addr[ETH_ALEN - 1] += index;
 835 
 836         /* Create random nic src and copy the first
 837          * 3 bytes to be the same as dev_addr
 838          */
 839         eth_random_addr(nic_src);
 840         memcpy(nic_src, dev_addr, 3);
 841 
 842         /* Copy the nic_dest from dev_addr*/
 843         ether_addr_copy(nic_dest, dev_addr);
 844 }
 845 
 846 static void validate_mac_address(u8 *mac_address)
 847 {
 848         /* if zero address or multicast bit set, restore the default value */
 849         if (is_zero_ether_addr(mac_address) || (mac_address[0] & 0x01)) {
 850                 pr_err("MAC invalid, restoring default\n");
 851                 memcpy(mac_address, gdm_lte_macaddr, 6);
 852         }
 853 }
 854 
 855 int register_lte_device(struct phy_dev *phy_dev,
 856                         struct device *dev, u8 *mac_address)
 857 {
 858         struct nic *nic;
 859         struct net_device *net;
 860         char pdn_dev_name[16];
 861         int ret = 0;
 862         u8 index;
 863 
 864         validate_mac_address(mac_address);
 865 
 866         for (index = 0; index < MAX_NIC_TYPE; index++) {
 867                 /* Create device name lteXpdnX */
 868                 sprintf(pdn_dev_name, "lte%%dpdn%d", index);
 869 
 870                 /* Allocate netdev */
 871                 net = alloc_netdev(sizeof(struct nic), pdn_dev_name,
 872                                    NET_NAME_UNKNOWN, ether_setup);
 873                 if (!net) {
 874                         ret = -ENOMEM;
 875                         goto err;
 876                 }
 877                 net->netdev_ops = &gdm_netdev_ops;
 878                 net->flags &= ~IFF_MULTICAST;
 879                 net->mtu = DEFAULT_MTU_SIZE;
 880 
 881                 nic = netdev_priv(net);
 882                 memset(nic, 0, sizeof(struct nic));
 883                 nic->netdev = net;
 884                 nic->phy_dev = phy_dev;
 885                 nic->nic_id = index;
 886 
 887                 form_mac_address(net->dev_addr,
 888                                  nic->src_mac_addr,
 889                                  nic->dest_mac_addr,
 890                                  mac_address,
 891                                  index);
 892 
 893                 SET_NETDEV_DEV(net, dev);
 894                 SET_NETDEV_DEVTYPE(net, &wwan_type);
 895 
 896                 ret = register_netdev(net);
 897                 if (ret)
 898                         goto err;
 899 
 900                 netif_carrier_on(net);
 901 
 902                 phy_dev->dev[index] = net;
 903         }
 904 
 905         return 0;
 906 
 907 err:
 908         unregister_lte_device(phy_dev);
 909 
 910         return ret;
 911 }
 912 
 913 void unregister_lte_device(struct phy_dev *phy_dev)
 914 {
 915         struct net_device *net;
 916         int index;
 917 
 918         for (index = 0; index < MAX_NIC_TYPE; index++) {
 919                 net = phy_dev->dev[index];
 920                 if (!net)
 921                         continue;
 922 
 923                 unregister_netdev(net);
 924                 free_netdev(net);
 925         }
 926 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/gdm724x/gdm_lte.c

DEFINITIONS
