Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2012 Smith Micro Software, Inc. |
| 3 | * Copyright (c) 2012 Bjørn Mork <bjorn@mork.no> |
| 4 | * |
| 5 | * This driver is based on and reuse most of cdc_ncm, which is |
| 6 | * Copyright (C) ST-Ericsson 2010-2012 |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * version 2 as published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/netdevice.h> |
| 15 | #include <linux/ethtool.h> |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 16 | #include <linux/if_vlan.h> |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 17 | #include <linux/ip.h> |
| 18 | #include <linux/mii.h> |
| 19 | #include <linux/usb.h> |
| 20 | #include <linux/usb/cdc.h> |
| 21 | #include <linux/usb/usbnet.h> |
| 22 | #include <linux/usb/cdc-wdm.h> |
| 23 | #include <linux/usb/cdc_ncm.h> |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 24 | #include <net/ipv6.h> |
| 25 | #include <net/addrconf.h> |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 26 | |
| 27 | /* driver specific data - must match cdc_ncm usage */ |
| 28 | struct cdc_mbim_state { |
| 29 | struct cdc_ncm_ctx *ctx; |
| 30 | atomic_t pmcount; |
| 31 | struct usb_driver *subdriver; |
| 32 | struct usb_interface *control; |
| 33 | struct usb_interface *data; |
| 34 | }; |
| 35 | |
| 36 | /* using a counter to merge subdriver requests with our own into a combined state */ |
| 37 | static int cdc_mbim_manage_power(struct usbnet *dev, int on) |
| 38 | { |
| 39 | struct cdc_mbim_state *info = (void *)&dev->data; |
| 40 | int rv = 0; |
| 41 | |
| 42 | dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on); |
| 43 | |
| 44 | if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) { |
| 45 | /* need autopm_get/put here to ensure the usbcore sees the new value */ |
| 46 | rv = usb_autopm_get_interface(dev->intf); |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 47 | dev->intf->needs_remote_wakeup = on; |
Bjørn Mork | 04d948a | 2013-11-01 14:18:52 +0100 | [diff] [blame] | 48 | if (!rv) |
| 49 | usb_autopm_put_interface(dev->intf); |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 50 | } |
Bjørn Mork | 04d948a | 2013-11-01 14:18:52 +0100 | [diff] [blame] | 51 | return 0; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status) |
| 55 | { |
| 56 | struct usbnet *dev = usb_get_intfdata(intf); |
| 57 | |
| 58 | /* can be called while disconnecting */ |
| 59 | if (!dev) |
| 60 | return 0; |
| 61 | |
| 62 | return cdc_mbim_manage_power(dev, status); |
| 63 | } |
| 64 | |
| 65 | |
| 66 | static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf) |
| 67 | { |
| 68 | struct cdc_ncm_ctx *ctx; |
| 69 | struct usb_driver *subdriver = ERR_PTR(-ENODEV); |
| 70 | int ret = -ENODEV; |
Bjørn Mork | 1e8bbe6 | 2013-03-14 01:05:13 +0000 | [diff] [blame] | 71 | u8 data_altsetting = cdc_ncm_select_altsetting(dev, intf); |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 72 | struct cdc_mbim_state *info = (void *)&dev->data; |
| 73 | |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 74 | /* Probably NCM, defer for cdc_ncm_bind */ |
| 75 | if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) |
| 76 | goto err; |
| 77 | |
| 78 | ret = cdc_ncm_bind_common(dev, intf, data_altsetting); |
| 79 | if (ret) |
| 80 | goto err; |
| 81 | |
| 82 | ctx = info->ctx; |
| 83 | |
| 84 | /* The MBIM descriptor and the status endpoint are required */ |
| 85 | if (ctx->mbim_desc && dev->status) |
| 86 | subdriver = usb_cdc_wdm_register(ctx->control, |
| 87 | &dev->status->desc, |
| 88 | le16_to_cpu(ctx->mbim_desc->wMaxControlMessage), |
| 89 | cdc_mbim_wdm_manage_power); |
| 90 | if (IS_ERR(subdriver)) { |
| 91 | ret = PTR_ERR(subdriver); |
| 92 | cdc_ncm_unbind(dev, intf); |
| 93 | goto err; |
| 94 | } |
| 95 | |
| 96 | /* can't let usbnet use the interrupt endpoint */ |
| 97 | dev->status = NULL; |
| 98 | info->subdriver = subdriver; |
| 99 | |
| 100 | /* MBIM cannot do ARP */ |
| 101 | dev->net->flags |= IFF_NOARP; |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 102 | |
| 103 | /* no need to put the VLAN tci in the packet headers */ |
Patrick McHardy | f646968 | 2013-04-19 02:04:27 +0000 | [diff] [blame] | 104 | dev->net->features |= NETIF_F_HW_VLAN_CTAG_TX; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 105 | err: |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | static void cdc_mbim_unbind(struct usbnet *dev, struct usb_interface *intf) |
| 110 | { |
| 111 | struct cdc_mbim_state *info = (void *)&dev->data; |
| 112 | struct cdc_ncm_ctx *ctx = info->ctx; |
| 113 | |
| 114 | /* disconnect subdriver from control interface */ |
| 115 | if (info->subdriver && info->subdriver->disconnect) |
| 116 | info->subdriver->disconnect(ctx->control); |
| 117 | info->subdriver = NULL; |
| 118 | |
| 119 | /* let NCM unbind clean up both control and data interface */ |
| 120 | cdc_ncm_unbind(dev, intf); |
| 121 | } |
| 122 | |
Bjørn Mork | 6b5eeb7 | 2014-05-09 14:45:00 +0200 | [diff] [blame] | 123 | /* verify that the ethernet protocol is IPv4 or IPv6 */ |
| 124 | static bool is_ip_proto(__be16 proto) |
| 125 | { |
| 126 | switch (proto) { |
| 127 | case htons(ETH_P_IP): |
| 128 | case htons(ETH_P_IPV6): |
| 129 | return true; |
| 130 | } |
| 131 | return false; |
| 132 | } |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 133 | |
| 134 | static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
| 135 | { |
| 136 | struct sk_buff *skb_out; |
| 137 | struct cdc_mbim_state *info = (void *)&dev->data; |
| 138 | struct cdc_ncm_ctx *ctx = info->ctx; |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 139 | __le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN); |
| 140 | u16 tci = 0; |
Bjørn Mork | 6b5eeb7 | 2014-05-09 14:45:00 +0200 | [diff] [blame] | 141 | bool is_ip; |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 142 | u8 *c; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 143 | |
| 144 | if (!ctx) |
| 145 | goto error; |
| 146 | |
| 147 | if (skb) { |
Bjørn Mork | 32b161a | 2013-04-16 00:17:07 +0000 | [diff] [blame] | 148 | if (skb->len <= ETH_HLEN) |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 149 | goto error; |
| 150 | |
Bjørn Mork | 6b5eeb7 | 2014-05-09 14:45:00 +0200 | [diff] [blame] | 151 | /* Some applications using e.g. packet sockets will |
| 152 | * bypass the VLAN acceleration and create tagged |
| 153 | * ethernet frames directly. We primarily look for |
| 154 | * the accelerated out-of-band tag, but fall back if |
| 155 | * required |
| 156 | */ |
| 157 | skb_reset_mac_header(skb); |
| 158 | if (vlan_get_tag(skb, &tci) < 0 && skb->len > VLAN_ETH_HLEN && |
| 159 | __vlan_get_tag(skb, &tci) == 0) { |
| 160 | is_ip = is_ip_proto(vlan_eth_hdr(skb)->h_vlan_encapsulated_proto); |
| 161 | skb_pull(skb, VLAN_ETH_HLEN); |
| 162 | } else { |
| 163 | is_ip = is_ip_proto(eth_hdr(skb)->h_proto); |
| 164 | skb_pull(skb, ETH_HLEN); |
| 165 | } |
| 166 | |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 167 | /* mapping VLANs to MBIM sessions: |
| 168 | * no tag => IPS session <0> |
| 169 | * 1 - 255 => IPS session <vlanid> |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 170 | * 256 - 511 => DSS session <vlanid - 256> |
| 171 | * 512 - 4095 => unsupported, drop |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 172 | */ |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 173 | switch (tci & 0x0f00) { |
| 174 | case 0x0000: /* VLAN ID 0 - 255 */ |
Bjørn Mork | 6b5eeb7 | 2014-05-09 14:45:00 +0200 | [diff] [blame] | 175 | if (!is_ip) |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 176 | goto error; |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 177 | c = (u8 *)&sign; |
| 178 | c[3] = tci; |
| 179 | break; |
| 180 | case 0x0100: /* VLAN ID 256 - 511 */ |
| 181 | sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN); |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 182 | c = (u8 *)&sign; |
| 183 | c[3] = tci; |
| 184 | break; |
| 185 | default: |
| 186 | netif_err(dev, tx_err, dev->net, |
| 187 | "unsupported tci=0x%04x\n", tci); |
| 188 | goto error; |
| 189 | } |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | spin_lock_bh(&ctx->mtx); |
Bjørn Mork | bed6f76 | 2013-11-01 11:16:42 +0100 | [diff] [blame] | 193 | skb_out = cdc_ncm_fill_tx_frame(dev, skb, sign); |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 194 | spin_unlock_bh(&ctx->mtx); |
| 195 | return skb_out; |
| 196 | |
| 197 | error: |
| 198 | if (skb) |
| 199 | dev_kfree_skb_any(skb); |
| 200 | |
| 201 | return NULL; |
| 202 | } |
| 203 | |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 204 | /* Some devices are known to send Neigbor Solicitation messages and |
| 205 | * require Neigbor Advertisement replies. The IPv6 core will not |
| 206 | * respond since IFF_NOARP is set, so we must handle them ourselves. |
| 207 | */ |
| 208 | static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci) |
| 209 | { |
| 210 | struct ipv6hdr *iph = (void *)buf; |
| 211 | struct nd_msg *msg = (void *)(iph + 1); |
| 212 | struct net_device *netdev; |
| 213 | struct inet6_dev *in6_dev; |
| 214 | bool is_router; |
| 215 | |
| 216 | /* we'll only respond to requests from unicast addresses to |
| 217 | * our solicited node addresses. |
| 218 | */ |
| 219 | if (!ipv6_addr_is_solict_mult(&iph->daddr) || |
| 220 | !(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST)) |
| 221 | return; |
| 222 | |
| 223 | /* need to send the NA on the VLAN dev, if any */ |
Bjørn Mork | 4f4178f | 2014-05-03 16:12:47 +0200 | [diff] [blame] | 224 | rcu_read_lock(); |
| 225 | if (tci) { |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 226 | netdev = __vlan_find_dev_deep(dev->net, htons(ETH_P_8021Q), |
| 227 | tci); |
Bjørn Mork | 4f4178f | 2014-05-03 16:12:47 +0200 | [diff] [blame] | 228 | if (!netdev) { |
| 229 | rcu_read_unlock(); |
| 230 | return; |
| 231 | } |
| 232 | } else { |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 233 | netdev = dev->net; |
Bjørn Mork | 4f4178f | 2014-05-03 16:12:47 +0200 | [diff] [blame] | 234 | } |
| 235 | dev_hold(netdev); |
| 236 | rcu_read_unlock(); |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 237 | |
| 238 | in6_dev = in6_dev_get(netdev); |
| 239 | if (!in6_dev) |
Bjørn Mork | 4f4178f | 2014-05-03 16:12:47 +0200 | [diff] [blame] | 240 | goto out; |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 241 | is_router = !!in6_dev->cnf.forwarding; |
| 242 | in6_dev_put(in6_dev); |
| 243 | |
| 244 | /* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */ |
| 245 | ipv6_stub->ndisc_send_na(netdev, NULL, &iph->saddr, &msg->target, |
| 246 | is_router /* router */, |
| 247 | true /* solicited */, |
| 248 | false /* override */, |
| 249 | true /* inc_opt */); |
Bjørn Mork | 4f4178f | 2014-05-03 16:12:47 +0200 | [diff] [blame] | 250 | out: |
| 251 | dev_put(netdev); |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | static bool is_neigh_solicit(u8 *buf, size_t len) |
| 255 | { |
| 256 | struct ipv6hdr *iph = (void *)buf; |
| 257 | struct nd_msg *msg = (void *)(iph + 1); |
| 258 | |
| 259 | return (len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) && |
| 260 | iph->nexthdr == IPPROTO_ICMPV6 && |
| 261 | msg->icmph.icmp6_code == 0 && |
| 262 | msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION); |
| 263 | } |
| 264 | |
| 265 | |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 266 | static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci) |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 267 | { |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 268 | __be16 proto = htons(ETH_P_802_3); |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 269 | struct sk_buff *skb = NULL; |
| 270 | |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 271 | if (tci < 256) { /* IPS session? */ |
| 272 | if (len < sizeof(struct iphdr)) |
| 273 | goto err; |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 274 | |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 275 | switch (*buf & 0xf0) { |
| 276 | case 0x40: |
| 277 | proto = htons(ETH_P_IP); |
| 278 | break; |
| 279 | case 0x60: |
Bjørn Mork | 5b8f15f | 2013-10-31 15:56:10 +0100 | [diff] [blame] | 280 | if (is_neigh_solicit(buf, len)) |
| 281 | do_neigh_solicit(dev, buf, tci); |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 282 | proto = htons(ETH_P_IPV6); |
| 283 | break; |
| 284 | default: |
| 285 | goto err; |
| 286 | } |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | skb = netdev_alloc_skb_ip_align(dev->net, len + ETH_HLEN); |
| 290 | if (!skb) |
| 291 | goto err; |
| 292 | |
| 293 | /* add an ethernet header */ |
| 294 | skb_put(skb, ETH_HLEN); |
| 295 | skb_reset_mac_header(skb); |
| 296 | eth_hdr(skb)->h_proto = proto; |
| 297 | memset(eth_hdr(skb)->h_source, 0, ETH_ALEN); |
| 298 | memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN); |
| 299 | |
| 300 | /* add datagram */ |
| 301 | memcpy(skb_put(skb, len), buf, len); |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 302 | |
| 303 | /* map MBIM session to VLAN */ |
| 304 | if (tci) |
Patrick McHardy | 86a9bad | 2013-04-19 02:04:30 +0000 | [diff] [blame] | 305 | vlan_put_tag(skb, htons(ETH_P_8021Q), tci); |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 306 | err: |
| 307 | return skb; |
| 308 | } |
| 309 | |
| 310 | static int cdc_mbim_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) |
| 311 | { |
| 312 | struct sk_buff *skb; |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 313 | struct cdc_mbim_state *info = (void *)&dev->data; |
| 314 | struct cdc_ncm_ctx *ctx = info->ctx; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 315 | int len; |
| 316 | int nframes; |
| 317 | int x; |
| 318 | int offset; |
| 319 | struct usb_cdc_ncm_ndp16 *ndp16; |
| 320 | struct usb_cdc_ncm_dpe16 *dpe16; |
| 321 | int ndpoffset; |
| 322 | int loopcount = 50; /* arbitrary max preventing infinite loop */ |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 323 | u8 *c; |
| 324 | u16 tci; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 325 | |
| 326 | ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in); |
| 327 | if (ndpoffset < 0) |
| 328 | goto error; |
| 329 | |
| 330 | next_ndp: |
| 331 | nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset); |
| 332 | if (nframes < 0) |
| 333 | goto error; |
| 334 | |
| 335 | ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); |
| 336 | |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 337 | switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) { |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 338 | case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN): |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 339 | c = (u8 *)&ndp16->dwSignature; |
| 340 | tci = c[3]; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 341 | break; |
Bjørn Mork | 9f651ca | 2012-10-22 10:56:40 +0000 | [diff] [blame] | 342 | case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN): |
| 343 | c = (u8 *)&ndp16->dwSignature; |
| 344 | tci = c[3] + 256; |
| 345 | break; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 346 | default: |
| 347 | netif_dbg(dev, rx_err, dev->net, |
| 348 | "unsupported NDP signature <0x%08x>\n", |
| 349 | le32_to_cpu(ndp16->dwSignature)); |
| 350 | goto err_ndp; |
| 351 | |
| 352 | } |
| 353 | |
| 354 | dpe16 = ndp16->dpe16; |
| 355 | for (x = 0; x < nframes; x++, dpe16++) { |
| 356 | offset = le16_to_cpu(dpe16->wDatagramIndex); |
| 357 | len = le16_to_cpu(dpe16->wDatagramLength); |
| 358 | |
| 359 | /* |
| 360 | * CDC NCM ch. 3.7 |
| 361 | * All entries after first NULL entry are to be ignored |
| 362 | */ |
| 363 | if ((offset == 0) || (len == 0)) { |
| 364 | if (!x) |
| 365 | goto err_ndp; /* empty NTB */ |
| 366 | break; |
| 367 | } |
| 368 | |
| 369 | /* sanity checking */ |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 370 | if (((offset + len) > skb_in->len) || (len > ctx->rx_max)) { |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 371 | netif_dbg(dev, rx_err, dev->net, |
| 372 | "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n", |
| 373 | x, offset, len, skb_in); |
| 374 | if (!x) |
| 375 | goto err_ndp; |
| 376 | break; |
| 377 | } else { |
Bjørn Mork | a82c7ce | 2012-10-22 10:56:39 +0000 | [diff] [blame] | 378 | skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci); |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 379 | if (!skb) |
| 380 | goto error; |
| 381 | usbnet_skb_return(dev, skb); |
| 382 | } |
| 383 | } |
| 384 | err_ndp: |
| 385 | /* are there more NDPs to process? */ |
| 386 | ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); |
| 387 | if (ndpoffset && loopcount--) |
| 388 | goto next_ndp; |
| 389 | |
| 390 | return 1; |
| 391 | error: |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message) |
| 396 | { |
Bjørn Mork | e62416e | 2013-11-01 14:18:56 +0100 | [diff] [blame] | 397 | int ret = -ENODEV; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 398 | struct usbnet *dev = usb_get_intfdata(intf); |
| 399 | struct cdc_mbim_state *info = (void *)&dev->data; |
| 400 | struct cdc_ncm_ctx *ctx = info->ctx; |
| 401 | |
Bjørn Mork | e62416e | 2013-11-01 14:18:56 +0100 | [diff] [blame] | 402 | if (!ctx) |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 403 | goto error; |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 404 | |
Ming Lei | 9a44312 | 2013-03-15 12:08:56 +0800 | [diff] [blame] | 405 | /* |
| 406 | * Both usbnet_suspend() and subdriver->suspend() MUST return 0 |
| 407 | * in system sleep context, otherwise, the resume callback has |
| 408 | * to recover device from previous suspend failure. |
| 409 | */ |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 410 | ret = usbnet_suspend(intf, message); |
| 411 | if (ret < 0) |
| 412 | goto error; |
| 413 | |
| 414 | if (intf == ctx->control && info->subdriver && info->subdriver->suspend) |
| 415 | ret = info->subdriver->suspend(intf, message); |
| 416 | if (ret < 0) |
| 417 | usbnet_resume(intf); |
| 418 | |
| 419 | error: |
| 420 | return ret; |
| 421 | } |
| 422 | |
| 423 | static int cdc_mbim_resume(struct usb_interface *intf) |
| 424 | { |
| 425 | int ret = 0; |
| 426 | struct usbnet *dev = usb_get_intfdata(intf); |
| 427 | struct cdc_mbim_state *info = (void *)&dev->data; |
| 428 | struct cdc_ncm_ctx *ctx = info->ctx; |
| 429 | bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume); |
| 430 | |
| 431 | if (callsub) |
| 432 | ret = info->subdriver->resume(intf); |
| 433 | if (ret < 0) |
| 434 | goto err; |
| 435 | ret = usbnet_resume(intf); |
Bjørn Mork | c37ac9b | 2013-11-01 14:18:55 +0100 | [diff] [blame] | 436 | if (ret < 0 && callsub) |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 437 | info->subdriver->suspend(intf, PMSG_SUSPEND); |
| 438 | err: |
| 439 | return ret; |
| 440 | } |
| 441 | |
| 442 | static const struct driver_info cdc_mbim_info = { |
| 443 | .description = "CDC MBIM", |
Bjørn Mork | 844e88f | 2013-01-23 00:57:02 +0000 | [diff] [blame] | 444 | .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN, |
| 445 | .bind = cdc_mbim_bind, |
| 446 | .unbind = cdc_mbim_unbind, |
| 447 | .manage_power = cdc_mbim_manage_power, |
| 448 | .rx_fixup = cdc_mbim_rx_fixup, |
| 449 | .tx_fixup = cdc_mbim_tx_fixup, |
| 450 | }; |
| 451 | |
| 452 | /* MBIM and NCM devices should not need a ZLP after NTBs with |
Bjørn Mork | c1a2e954 | 2013-10-31 15:56:11 +0100 | [diff] [blame] | 453 | * dwNtbOutMaxSize length. Nevertheless, a number of devices from |
| 454 | * different vendor IDs will fail unless we send ZLPs, forcing us |
| 455 | * to make this the default. |
| 456 | * |
| 457 | * This default may cause a performance penalty for spec conforming |
| 458 | * devices wanting to take advantage of optimizations possible without |
| 459 | * ZLPs. A whitelist is added in an attempt to avoid this for devices |
| 460 | * known to conform to the MBIM specification. |
| 461 | * |
| 462 | * All known devices supporting NCM compatibility mode are also |
| 463 | * conforming to the NCM and MBIM specifications. For this reason, the |
| 464 | * NCM subclass entry is also in the ZLP whitelist. |
Bjørn Mork | 844e88f | 2013-01-23 00:57:02 +0000 | [diff] [blame] | 465 | */ |
| 466 | static const struct driver_info cdc_mbim_info_zlp = { |
| 467 | .description = "CDC MBIM", |
Bjørn Mork | 328d7b8 | 2013-01-21 05:50:39 +0000 | [diff] [blame] | 468 | .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP, |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 469 | .bind = cdc_mbim_bind, |
| 470 | .unbind = cdc_mbim_unbind, |
| 471 | .manage_power = cdc_mbim_manage_power, |
| 472 | .rx_fixup = cdc_mbim_rx_fixup, |
| 473 | .tx_fixup = cdc_mbim_tx_fixup, |
| 474 | }; |
| 475 | |
| 476 | static const struct usb_device_id mbim_devs[] = { |
| 477 | /* This duplicate NCM entry is intentional. MBIM devices can |
| 478 | * be disguised as NCM by default, and this is necessary to |
| 479 | * allow us to bind the correct driver_info to such devices. |
| 480 | * |
| 481 | * bind() will sort out this for us, selecting the correct |
| 482 | * entry and reject the other |
| 483 | */ |
| 484 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), |
| 485 | .driver_info = (unsigned long)&cdc_mbim_info, |
| 486 | }, |
Bjørn Mork | c1a2e954 | 2013-10-31 15:56:11 +0100 | [diff] [blame] | 487 | /* ZLP conformance whitelist: All Ericsson MBIM devices */ |
| 488 | { USB_VENDOR_AND_INTERFACE_INFO(0x0bdb, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 489 | .driver_info = (unsigned long)&cdc_mbim_info, |
| 490 | }, |
Bjørn Mork | c1a2e954 | 2013-10-31 15:56:11 +0100 | [diff] [blame] | 491 | /* default entry */ |
| 492 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), |
| 493 | .driver_info = (unsigned long)&cdc_mbim_info_zlp, |
| 494 | }, |
Greg Suarez | 9bf211a3 | 2012-10-22 10:56:36 +0000 | [diff] [blame] | 495 | { |
| 496 | }, |
| 497 | }; |
| 498 | MODULE_DEVICE_TABLE(usb, mbim_devs); |
| 499 | |
| 500 | static struct usb_driver cdc_mbim_driver = { |
| 501 | .name = "cdc_mbim", |
| 502 | .id_table = mbim_devs, |
| 503 | .probe = usbnet_probe, |
| 504 | .disconnect = usbnet_disconnect, |
| 505 | .suspend = cdc_mbim_suspend, |
| 506 | .resume = cdc_mbim_resume, |
| 507 | .reset_resume = cdc_mbim_resume, |
| 508 | .supports_autosuspend = 1, |
| 509 | .disable_hub_initiated_lpm = 1, |
| 510 | }; |
| 511 | module_usb_driver(cdc_mbim_driver); |
| 512 | |
| 513 | MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>"); |
| 514 | MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>"); |
| 515 | MODULE_DESCRIPTION("USB CDC MBIM host driver"); |
| 516 | MODULE_LICENSE("GPL"); |