]> git.karo-electronics.de Git - linux-beck.git/blob - drivers/staging/gdm724x/gdm_lte.c
Merge 3.14-rc7 into staging-next
[linux-beck.git] / drivers / staging / gdm724x / gdm_lte.c
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(&eth, skb_in->data, sizeof(struct ethhdr));
128                 mac_header_data = &eth;
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         memcpy(skb_put(skb_out, mac_header_len), mac_header_data,
165                 mac_header_len);
166         memcpy(skb_put(skb_out, sizeof(struct arphdr)), arp_out,
167                 sizeof(struct arphdr));
168         memcpy(skb_put(skb_out, sizeof(struct arpdata)), arp_data_out,
169                 sizeof(struct arpdata));
170
171         skb_out->protocol = ((struct ethhdr *)mac_header_data)->h_proto;
172         skb_out->dev = skb_in->dev;
173         skb_reset_mac_header(skb_out);
174         skb_pull(skb_out, ETH_HLEN);
175
176         gdm_lte_rx(skb_out, nic, nic_type);
177
178         return 0;
179 }
180
181 static int icmp6_checksum(struct ipv6hdr *ipv6, u16 *ptr, int len)
182 {
183         unsigned short *w = ptr;
184         int sum = 0;
185         int i;
186
187         union {
188                 struct {
189                         u8 ph_src[16];
190                         u8 ph_dst[16];
191                         u32 ph_len;
192                         u8 ph_zero[3];
193                         u8 ph_nxt;
194                 } ph __packed;
195                 u16 pa[20];
196         } pseudo_header;
197
198         memset(&pseudo_header, 0, sizeof(pseudo_header));
199         memcpy(&pseudo_header.ph.ph_src, &ipv6->saddr.in6_u.u6_addr8, 16);
200         memcpy(&pseudo_header.ph.ph_dst, &ipv6->daddr.in6_u.u6_addr8, 16);
201         pseudo_header.ph.ph_len = ipv6->payload_len;
202         pseudo_header.ph.ph_nxt = ipv6->nexthdr;
203
204         w = (u16 *)&pseudo_header;
205         for (i = 0; i < ARRAY_SIZE(pseudo_header.pa); i++)
206                 sum += pseudo_header.pa[i];
207
208         w = ptr;
209         while (len > 1) {
210                 sum += *w++;
211                 len -= 2;
212         }
213
214         sum = (sum >> 16) + (sum & 0xFFFF);
215         sum += (sum >> 16);
216         sum = ~sum & 0xffff;
217
218         return sum;
219 }
220
221 static int gdm_lte_emulate_ndp(struct sk_buff *skb_in, u32 nic_type)
222 {
223         struct nic *nic = netdev_priv(skb_in->dev);
224         struct sk_buff *skb_out;
225         struct ethhdr eth;
226         struct vlan_ethhdr vlan_eth;
227         struct neighbour_advertisement {
228                 u8 target_address[16];
229                 u8 type;
230                 u8 length;
231                 u8 link_layer_address[6];
232         };
233         struct neighbour_advertisement na;
234         struct neighbour_solicitation {
235                 u8 target_address[16];
236         };
237         struct neighbour_solicitation *ns;
238         struct ipv6hdr *ipv6_in;
239         struct ipv6hdr ipv6_out;
240         struct icmp6hdr *icmp6_in;
241         struct icmp6hdr icmp6_out;
242
243         void *mac_header_data;
244         u32 mac_header_len;
245
246         /* Format the mac header so that it can be put to skb */
247         if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) {
248                 memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr));
249                 if (ntohs(vlan_eth.h_vlan_encapsulated_proto) != ETH_P_IPV6)
250                         return -1;
251                 mac_header_data = &vlan_eth;
252                 mac_header_len = VLAN_ETH_HLEN;
253         } else {
254                 memcpy(&eth, skb_in->data, sizeof(struct ethhdr));
255                 if (ntohs(eth.h_proto) != ETH_P_IPV6)
256                         return -1;
257                 mac_header_data = &eth;
258                 mac_header_len = ETH_HLEN;
259         }
260
261         /* Check if this is IPv6 ICMP packet */
262         ipv6_in = (struct ipv6hdr *)(skb_in->data + mac_header_len);
263         if (ipv6_in->version != 6 || ipv6_in->nexthdr != IPPROTO_ICMPV6)
264                 return -1;
265
266         /* Check if this is NDP packet */
267         icmp6_in = (struct icmp6hdr *)(skb_in->data + mac_header_len +
268                                         sizeof(struct ipv6hdr));
269         if (icmp6_in->icmp6_type == NDISC_ROUTER_SOLICITATION) { /* Check RS */
270                 return -1;
271         } else if (icmp6_in->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
272                 /* Check NS */
273                 u8 icmp_na[sizeof(struct icmp6hdr) +
274                         sizeof(struct neighbour_advertisement)];
275                 u8 zero_addr8[16] = {0,};
276
277                 if (memcmp(ipv6_in->saddr.in6_u.u6_addr8, zero_addr8, 16) == 0)
278                         /* Duplicate Address Detection: Source IP is all zero */
279                         return 0;
280
281                 icmp6_out.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
282                 icmp6_out.icmp6_code = 0;
283                 icmp6_out.icmp6_cksum = 0;
284                 icmp6_out.icmp6_dataun.un_data32[0] = htonl(0x60000000); /* R=0, S=1, O=1 */
285
286                 ns = (struct neighbour_solicitation *)
287                         (skb_in->data + mac_header_len +
288                          sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr));
289                 memcpy(&na.target_address, ns->target_address, 16);
290                 na.type = 0x02;
291                 na.length = 1;
292                 na.link_layer_address[0] = 0x00;
293                 na.link_layer_address[1] = 0x0a;
294                 na.link_layer_address[2] = 0x3b;
295                 na.link_layer_address[3] = 0xaf;
296                 na.link_layer_address[4] = 0x63;
297                 na.link_layer_address[5] = 0xc7;
298
299                 memcpy(&ipv6_out, ipv6_in, sizeof(struct ipv6hdr));
300                 memcpy(ipv6_out.saddr.in6_u.u6_addr8, &na.target_address, 16);
301                 memcpy(ipv6_out.daddr.in6_u.u6_addr8,
302                         ipv6_in->saddr.in6_u.u6_addr8, 16);
303                 ipv6_out.payload_len = htons(sizeof(struct icmp6hdr) +
304                                 sizeof(struct neighbour_advertisement));
305
306                 memcpy(icmp_na, &icmp6_out, sizeof(struct icmp6hdr));
307                 memcpy(icmp_na + sizeof(struct icmp6hdr), &na,
308                         sizeof(struct neighbour_advertisement));
309
310                 icmp6_out.icmp6_cksum = icmp6_checksum(&ipv6_out,
311                                         (u16 *)icmp_na, sizeof(icmp_na));
312         } else {
313                 return -1;
314         }
315
316         /* Fill the destination mac with source mac of the received packet */
317         memcpy(mac_header_data, mac_header_data + ETH_ALEN, ETH_ALEN);
318         /* Fill the source mac with nic's source mac */
319         memcpy(mac_header_data + ETH_ALEN, nic->src_mac_addr, ETH_ALEN);
320
321         /* Alloc skb and reserve align */
322         skb_out = dev_alloc_skb(skb_in->len);
323         if (!skb_out)
324                 return -ENOMEM;
325         skb_reserve(skb_out, NET_IP_ALIGN);
326
327         memcpy(skb_put(skb_out, mac_header_len), mac_header_data,
328                 mac_header_len);
329         memcpy(skb_put(skb_out, sizeof(struct ipv6hdr)), &ipv6_out,
330                 sizeof(struct ipv6hdr));
331         memcpy(skb_put(skb_out, sizeof(struct icmp6hdr)), &icmp6_out,
332                 sizeof(struct icmp6hdr));
333         memcpy(skb_put(skb_out, sizeof(struct neighbour_advertisement)), &na,
334                 sizeof(struct neighbour_advertisement));
335
336         skb_out->protocol = ((struct ethhdr *)mac_header_data)->h_proto;
337         skb_out->dev = skb_in->dev;
338         skb_reset_mac_header(skb_out);
339         skb_pull(skb_out, ETH_HLEN);
340
341         gdm_lte_rx(skb_out, nic, nic_type);
342
343         return 0;
344 }
345
346 static s32 gdm_lte_tx_nic_type(struct net_device *dev, struct sk_buff *skb)
347 {
348         struct nic *nic = netdev_priv(dev);
349         struct ethhdr *eth;
350         struct vlan_ethhdr *vlan_eth;
351         struct iphdr *ip;
352         struct ipv6hdr *ipv6;
353         int mac_proto;
354         void *network_data;
355         u32 nic_type = 0;
356
357         /* NIC TYPE is based on the nic_id of this net_device */
358         nic_type = 0x00000010 | nic->nic_id;
359
360         /* Get ethernet protocol */
361         eth = (struct ethhdr *)skb->data;
362         if (ntohs(eth->h_proto) == ETH_P_8021Q) {
363                 vlan_eth = (struct vlan_ethhdr *)skb->data;
364                 mac_proto = ntohs(vlan_eth->h_vlan_encapsulated_proto);
365                 network_data = skb->data + VLAN_ETH_HLEN;
366                 nic_type |= NIC_TYPE_F_VLAN;
367         } else {
368                 mac_proto = ntohs(eth->h_proto);
369                 network_data = skb->data + ETH_HLEN;
370         }
371
372         /* Process packet for nic type */
373         switch (mac_proto) {
374         case ETH_P_ARP:
375                 nic_type |= NIC_TYPE_ARP;
376                 break;
377         case ETH_P_IP:
378                 nic_type |= NIC_TYPE_F_IPV4;
379                 ip = (struct iphdr *)network_data;
380
381                 /* Check DHCPv4 */
382                 if (ip->protocol == IPPROTO_UDP) {
383                         struct udphdr *udp = (struct udphdr *)
384                                         (network_data + sizeof(struct iphdr));
385                         if (ntohs(udp->dest) == 67 || ntohs(udp->dest) == 68)
386                                 nic_type |= NIC_TYPE_F_DHCP;
387                 }
388                 break;
389         case ETH_P_IPV6:
390                 nic_type |= NIC_TYPE_F_IPV6;
391                 ipv6 = (struct ipv6hdr *)network_data;
392
393                 if (ipv6->nexthdr == IPPROTO_ICMPV6) /* Check NDP request */ {
394                         struct icmp6hdr *icmp6 = (struct icmp6hdr *)
395                                         (network_data + sizeof(struct ipv6hdr));
396                         if (icmp6->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
397                                 nic_type |= NIC_TYPE_ICMPV6;
398                 } else if (ipv6->nexthdr == IPPROTO_UDP) /* Check DHCPv6 */ {
399                         struct udphdr *udp = (struct udphdr *)
400                                         (network_data + sizeof(struct ipv6hdr));
401                         if (ntohs(udp->dest) == 546 || ntohs(udp->dest) == 547)
402                                 nic_type |= NIC_TYPE_F_DHCP;
403                 }
404                 break;
405         default:
406                 break;
407         }
408
409         return nic_type;
410 }
411
412 static int gdm_lte_tx(struct sk_buff *skb, struct net_device *dev)
413 {
414         struct nic *nic = netdev_priv(dev);
415         u32 nic_type;
416         void *data_buf;
417         int data_len;
418         int idx;
419         int ret = 0;
420
421         nic_type = gdm_lte_tx_nic_type(dev, skb);
422         if (nic_type == 0) {
423                 netdev_err(dev, "tx - invalid nic_type\n");
424                 return -1;
425         }
426
427         if (nic_type & NIC_TYPE_ARP) {
428                 if (gdm_lte_emulate_arp(skb, nic_type) == 0) {
429                         dev_kfree_skb(skb);
430                         return 0;
431                 }
432         }
433
434         if (nic_type & NIC_TYPE_ICMPV6) {
435                 if (gdm_lte_emulate_ndp(skb, nic_type) == 0) {
436                         dev_kfree_skb(skb);
437                         return 0;
438                 }
439         }
440
441         /*
442          * Need byte shift (that is, remove VLAN tag) if there is one
443          * For the case of ARP, this breaks the offset as vlan_ethhdr+4
444          * is treated as ethhdr However, it shouldn't be a problem as
445          * the response starts from arp_hdr and ethhdr is created by this
446          * driver based on the NIC mac
447          */
448         if (nic_type & NIC_TYPE_F_VLAN) {
449                 struct vlan_ethhdr *vlan_eth = (struct vlan_ethhdr *)skb->data;
450                 nic->vlan_id = ntohs(vlan_eth->h_vlan_TCI) & VLAN_VID_MASK;
451                 data_buf = skb->data + (VLAN_ETH_HLEN - ETH_HLEN);
452                 data_len = skb->len - (VLAN_ETH_HLEN - ETH_HLEN);
453         } else {
454                 nic->vlan_id = 0;
455                 data_buf = skb->data;
456                 data_len = skb->len;
457         }
458
459         /* If it is a ICMPV6 packet, clear all the other bits :
460          * for backward compatibility with the firmware
461          */
462         if (nic_type & NIC_TYPE_ICMPV6)
463                 nic_type = NIC_TYPE_ICMPV6;
464
465         /* If it is not a dhcp packet, clear all the flag bits :
466          * original NIC, otherwise the special flag (IPVX | DHCP)
467          */
468         if (!(nic_type & NIC_TYPE_F_DHCP))
469                 nic_type &= NIC_TYPE_MASK;
470
471         sscanf(dev->name, "lte%d", &idx);
472
473         ret = nic->phy_dev->send_sdu_func(nic->phy_dev->priv_dev,
474                                           data_buf, data_len,
475                                           nic->pdn_table.dft_eps_id, 0,
476                                           tx_complete, nic, idx,
477                                           nic_type);
478
479         if (ret == TX_NO_BUFFER || ret == TX_NO_SPC) {
480                 netif_stop_queue(dev);
481                 if (ret == TX_NO_BUFFER)
482                         ret = 0;
483                 else
484                         ret = -ENOSPC;
485         } else if (ret == TX_NO_DEV) {
486                 ret = -ENODEV;
487         }
488
489         /* Updates tx stats */
490         if (ret) {
491                 nic->stats.tx_dropped++;
492         } else {
493                 nic->stats.tx_packets++;
494                 nic->stats.tx_bytes += data_len;
495         }
496         dev_kfree_skb(skb);
497
498         return 0;
499 }
500
501 static struct net_device_stats *gdm_lte_stats(struct net_device *dev)
502 {
503         struct nic *nic = netdev_priv(dev);
504         return &nic->stats;
505 }
506
507 static int gdm_lte_event_send(struct net_device *dev, char *buf, int len)
508 {
509         struct nic *nic = netdev_priv(dev);
510         struct hci_packet *hci = (struct hci_packet *)buf;
511         int idx;
512
513         sscanf(dev->name, "lte%d", &idx);
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                 netlink_exit(lte_event.sock);
549                 lte_event.sock = NULL;
550         }
551 }
552
553 static u8 find_dev_index(u32 nic_type)
554 {
555         u8 index;
556
557         index = (u8)(nic_type & 0x0000000f);
558         if (index > MAX_NIC_TYPE)
559                 index = 0;
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                         memcpy(nic->dest_mac_addr, addr, ETH_ALEN);
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 *)&eth;
629                 mac_header_len = ETH_HLEN;
630         }
631
632         /* Format the data so that it can be put to skb */
633         memcpy(mac_header_data, nic->dest_mac_addr, ETH_ALEN);
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         memcpy(skb_put(skb, mac_header_len), mac_header_data, mac_header_len);
666         memcpy(skb_put(skb, len), 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         u8 *data = (u8 *)multi_sdu->data;
682         u16 i = 0;
683         u16 num_packet;
684         u16 hci_len;
685         u16 cmd_evt;
686         u32 nic_type;
687         u8 index;
688
689         hci_len = gdm_dev16_to_cpu(phy_dev->get_endian(phy_dev->priv_dev),
690                                 multi_sdu->len);
691         num_packet = gdm_dev16_to_cpu(phy_dev->get_endian(phy_dev->priv_dev),
692                                 multi_sdu->num_packet);
693
694         for (i = 0; i < num_packet; i++) {
695                 sdu = (struct sdu *)data;
696
697                 cmd_evt = gdm_dev16_to_cpu(phy_dev->
698                                 get_endian(phy_dev->priv_dev), sdu->cmd_evt);
699                 hci_len = gdm_dev16_to_cpu(phy_dev->
700                                 get_endian(phy_dev->priv_dev), sdu->len);
701                 nic_type = gdm_dev32_to_cpu(phy_dev->
702                                 get_endian(phy_dev->priv_dev), sdu->nic_type);
703
704                 if (cmd_evt != LTE_RX_SDU) {
705                         pr_err("rx sdu wrong hci %04x\n", cmd_evt);
706                         return;
707                 }
708                 if (hci_len < 12) {
709                         pr_err("rx sdu invalid len %d\n", hci_len);
710                         return;
711                 }
712
713                 index = find_dev_index(nic_type);
714                 if (index < MAX_NIC_TYPE) {
715                         dev = phy_dev->dev[index];
716                         gdm_lte_netif_rx(dev, (char *)sdu->data,
717                                         (int)(hci_len-12), nic_type);
718                 } else {
719                         pr_err("rx sdu invalid nic_type :%x\n", nic_type);
720                 }
721
722                 data += ((hci_len+3) & 0xfffc) + HCI_HEADER_SIZE;
723         }
724 }
725
726 static void gdm_lte_pdn_table(struct net_device *dev, char *buf, int len)
727 {
728         struct nic *nic = netdev_priv(dev);
729         struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf;
730
731         if (pdn_table->activate) {
732                 nic->pdn_table.activate = pdn_table->activate;
733                 nic->pdn_table.dft_eps_id = gdm_dev32_to_cpu(
734                                                 nic->phy_dev->get_endian(
735                                                         nic->phy_dev->priv_dev),
736                                                 pdn_table->dft_eps_id);
737                 nic->pdn_table.nic_type = gdm_dev32_to_cpu(
738                                                 nic->phy_dev->get_endian(
739                                                         nic->phy_dev->priv_dev),
740                                                 pdn_table->nic_type);
741
742                 netdev_info(dev, "pdn activated, nic_type=0x%x\n",
743                             nic->pdn_table.nic_type);
744         } else {
745                 memset(&nic->pdn_table, 0x00, sizeof(struct pdn_table));
746                 netdev_info(dev, "pdn deactivated\n");
747         }
748 }
749
750 static int gdm_lte_receive_pkt(struct phy_dev *phy_dev, char *buf, int len)
751 {
752         struct hci_packet *hci = (struct hci_packet *)buf;
753         struct hci_pdn_table_ind *pdn_table = (struct hci_pdn_table_ind *)buf;
754         struct sdu *sdu;
755         struct net_device *dev;
756         int ret = 0;
757         u16 cmd_evt;
758         u32 nic_type;
759         u8 index;
760
761         if (!len)
762                 return ret;
763
764         cmd_evt = gdm_dev16_to_cpu(phy_dev->get_endian(phy_dev->priv_dev),
765                                 hci->cmd_evt);
766
767         dev = phy_dev->dev[0];
768         if (dev == NULL)
769                 return 0;
770
771         switch (cmd_evt) {
772         case LTE_RX_SDU:
773                 sdu = (struct sdu *)hci->data;
774                 nic_type = gdm_dev32_to_cpu(phy_dev->
775                                 get_endian(phy_dev->priv_dev), sdu->nic_type);
776                 index = find_dev_index(nic_type);
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(phy_dev->
791                                 get_endian(phy_dev->priv_dev),
792                                 pdn_table->nic_type);
793                 index = find_dev_index(nic_type);
794                 dev = phy_dev->dev[index];
795                 gdm_lte_pdn_table(dev, buf, len);
796                 /* Fall through */
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 = (struct phy_dev *)arg;
808
809         return gdm_lte_receive_pkt(phy_dev, (char *)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 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                 memcpy(dev_addr, gdm_lte_macaddr, ETH_ALEN);
837         else
838                 memcpy(dev_addr, mac_address, ETH_ALEN);
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         random_ether_addr(nic_src);
849         memcpy(nic_src, dev_addr, 3);
850
851         /* Copy the nic_dest from dev_addr*/
852         memcpy(nic_dest, dev_addr, ETH_ALEN);
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         int ret = 0;
871         u8 index;
872
873         validate_mac_address(mac_address);
874
875         for (index = 0; index < MAX_NIC_TYPE; index++) {
876                 /* Create device name lteXpdnX */
877                 sprintf(pdn_dev_name, "lte%%dpdn%d", index);
878
879                 /* Allocate netdev */
880                 net = alloc_netdev(sizeof(struct nic), pdn_dev_name,
881                                 ether_setup);
882                 if (net == NULL) {
883                         pr_err("alloc_netdev failed\n");
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(
898                                 net->dev_addr,
899                                 nic->src_mac_addr,
900                                 nic->dest_mac_addr,
901                                 mac_address,
902                                 index);
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 == NULL)
932                         continue;
933
934                 unregister_netdev(net);
935                 free_netdev(net);
936         }
937 }