Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Wireless utility functions |
| 3 | * |
Johannes Berg | d323655 | 2009-04-20 14:31:42 +0200 | [diff] [blame] | 4 | * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 5 | */ |
Johannes Berg | d323655 | 2009-04-20 14:31:42 +0200 | [diff] [blame] | 6 | #include <linux/bitops.h> |
Zhu Yi | e31a16d | 2009-05-21 21:47:03 +0800 | [diff] [blame] | 7 | #include <linux/etherdevice.h> |
Johannes Berg | d323655 | 2009-04-20 14:31:42 +0200 | [diff] [blame] | 8 | #include <net/cfg80211.h> |
Zhu Yi | e31a16d | 2009-05-21 21:47:03 +0800 | [diff] [blame] | 9 | #include <net/ip.h> |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 10 | #include "core.h" |
| 11 | |
Johannes Berg | bd81525 | 2008-10-29 20:00:45 +0100 | [diff] [blame] | 12 | struct ieee80211_rate * |
| 13 | ieee80211_get_response_rate(struct ieee80211_supported_band *sband, |
Johannes Berg | 881d948 | 2009-01-21 15:13:48 +0100 | [diff] [blame] | 14 | u32 basic_rates, int bitrate) |
Johannes Berg | bd81525 | 2008-10-29 20:00:45 +0100 | [diff] [blame] | 15 | { |
| 16 | struct ieee80211_rate *result = &sband->bitrates[0]; |
| 17 | int i; |
| 18 | |
| 19 | for (i = 0; i < sband->n_bitrates; i++) { |
| 20 | if (!(basic_rates & BIT(i))) |
| 21 | continue; |
| 22 | if (sband->bitrates[i].bitrate > bitrate) |
| 23 | continue; |
| 24 | result = &sband->bitrates[i]; |
| 25 | } |
| 26 | |
| 27 | return result; |
| 28 | } |
| 29 | EXPORT_SYMBOL(ieee80211_get_response_rate); |
| 30 | |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 31 | int ieee80211_channel_to_frequency(int chan) |
| 32 | { |
| 33 | if (chan < 14) |
| 34 | return 2407 + chan * 5; |
| 35 | |
| 36 | if (chan == 14) |
| 37 | return 2484; |
| 38 | |
| 39 | /* FIXME: 802.11j 17.3.8.3.2 */ |
| 40 | return (chan + 1000) * 5; |
| 41 | } |
| 42 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); |
| 43 | |
| 44 | int ieee80211_frequency_to_channel(int freq) |
| 45 | { |
| 46 | if (freq == 2484) |
| 47 | return 14; |
| 48 | |
| 49 | if (freq < 2484) |
| 50 | return (freq - 2407) / 5; |
| 51 | |
| 52 | /* FIXME: 802.11j 17.3.8.3.2 */ |
| 53 | return freq/5 - 1000; |
| 54 | } |
| 55 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); |
| 56 | |
Johannes Berg | 6c507cd | 2008-03-26 14:14:55 +0100 | [diff] [blame] | 57 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
| 58 | int freq) |
Johannes Berg | 906c730 | 2008-03-16 18:34:33 +0100 | [diff] [blame] | 59 | { |
| 60 | enum ieee80211_band band; |
| 61 | struct ieee80211_supported_band *sband; |
| 62 | int i; |
| 63 | |
| 64 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| 65 | sband = wiphy->bands[band]; |
| 66 | |
| 67 | if (!sband) |
| 68 | continue; |
| 69 | |
| 70 | for (i = 0; i < sband->n_channels; i++) { |
| 71 | if (sband->channels[i].center_freq == freq) |
| 72 | return &sband->channels[i]; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | return NULL; |
| 77 | } |
Johannes Berg | 6c507cd | 2008-03-26 14:14:55 +0100 | [diff] [blame] | 78 | EXPORT_SYMBOL(__ieee80211_get_channel); |
Johannes Berg | 906c730 | 2008-03-16 18:34:33 +0100 | [diff] [blame] | 79 | |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 80 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
| 81 | enum ieee80211_band band) |
| 82 | { |
| 83 | int i, want; |
| 84 | |
| 85 | switch (band) { |
| 86 | case IEEE80211_BAND_5GHZ: |
| 87 | want = 3; |
| 88 | for (i = 0; i < sband->n_bitrates; i++) { |
| 89 | if (sband->bitrates[i].bitrate == 60 || |
| 90 | sband->bitrates[i].bitrate == 120 || |
| 91 | sband->bitrates[i].bitrate == 240) { |
| 92 | sband->bitrates[i].flags |= |
| 93 | IEEE80211_RATE_MANDATORY_A; |
| 94 | want--; |
| 95 | } |
| 96 | } |
| 97 | WARN_ON(want); |
| 98 | break; |
| 99 | case IEEE80211_BAND_2GHZ: |
| 100 | want = 7; |
| 101 | for (i = 0; i < sband->n_bitrates; i++) { |
| 102 | if (sband->bitrates[i].bitrate == 10) { |
| 103 | sband->bitrates[i].flags |= |
| 104 | IEEE80211_RATE_MANDATORY_B | |
| 105 | IEEE80211_RATE_MANDATORY_G; |
| 106 | want--; |
| 107 | } |
| 108 | |
| 109 | if (sband->bitrates[i].bitrate == 20 || |
| 110 | sband->bitrates[i].bitrate == 55 || |
| 111 | sband->bitrates[i].bitrate == 110 || |
| 112 | sband->bitrates[i].bitrate == 60 || |
| 113 | sband->bitrates[i].bitrate == 120 || |
| 114 | sband->bitrates[i].bitrate == 240) { |
| 115 | sband->bitrates[i].flags |= |
| 116 | IEEE80211_RATE_MANDATORY_G; |
| 117 | want--; |
| 118 | } |
| 119 | |
Johannes Berg | aac09fb | 2008-01-30 17:36:10 +0100 | [diff] [blame] | 120 | if (sband->bitrates[i].bitrate != 10 && |
| 121 | sband->bitrates[i].bitrate != 20 && |
| 122 | sband->bitrates[i].bitrate != 55 && |
| 123 | sband->bitrates[i].bitrate != 110) |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 124 | sband->bitrates[i].flags |= |
| 125 | IEEE80211_RATE_ERP_G; |
| 126 | } |
Ivo van Doorn | 406f238 | 2008-02-02 23:53:10 +0100 | [diff] [blame] | 127 | WARN_ON(want != 0 && want != 3 && want != 6); |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 128 | break; |
| 129 | case IEEE80211_NUM_BANDS: |
| 130 | WARN_ON(1); |
| 131 | break; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) |
| 136 | { |
| 137 | enum ieee80211_band band; |
| 138 | |
| 139 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) |
| 140 | if (wiphy->bands[band]) |
| 141 | set_mandatory_flags_band(wiphy->bands[band], band); |
| 142 | } |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 143 | |
| 144 | int cfg80211_validate_key_settings(struct key_params *params, int key_idx, |
| 145 | const u8 *mac_addr) |
| 146 | { |
| 147 | if (key_idx > 5) |
| 148 | return -EINVAL; |
| 149 | |
| 150 | /* |
| 151 | * Disallow pairwise keys with non-zero index unless it's WEP |
| 152 | * (because current deployments use pairwise WEP keys with |
| 153 | * non-zero indizes but 802.11i clearly specifies to use zero) |
| 154 | */ |
| 155 | if (mac_addr && key_idx && |
| 156 | params->cipher != WLAN_CIPHER_SUITE_WEP40 && |
| 157 | params->cipher != WLAN_CIPHER_SUITE_WEP104) |
| 158 | return -EINVAL; |
| 159 | |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 160 | switch (params->cipher) { |
| 161 | case WLAN_CIPHER_SUITE_WEP40: |
Johannes Berg | 8fc0fee | 2009-05-24 16:57:19 +0200 | [diff] [blame] | 162 | if (params->key_len != WLAN_KEY_LEN_WEP40) |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 163 | return -EINVAL; |
| 164 | break; |
| 165 | case WLAN_CIPHER_SUITE_TKIP: |
Johannes Berg | 8fc0fee | 2009-05-24 16:57:19 +0200 | [diff] [blame] | 166 | if (params->key_len != WLAN_KEY_LEN_TKIP) |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 167 | return -EINVAL; |
| 168 | break; |
| 169 | case WLAN_CIPHER_SUITE_CCMP: |
Johannes Berg | 8fc0fee | 2009-05-24 16:57:19 +0200 | [diff] [blame] | 170 | if (params->key_len != WLAN_KEY_LEN_CCMP) |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 171 | return -EINVAL; |
| 172 | break; |
| 173 | case WLAN_CIPHER_SUITE_WEP104: |
Johannes Berg | 8fc0fee | 2009-05-24 16:57:19 +0200 | [diff] [blame] | 174 | if (params->key_len != WLAN_KEY_LEN_WEP104) |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 175 | return -EINVAL; |
| 176 | break; |
| 177 | case WLAN_CIPHER_SUITE_AES_CMAC: |
Johannes Berg | 8fc0fee | 2009-05-24 16:57:19 +0200 | [diff] [blame] | 178 | if (params->key_len != WLAN_KEY_LEN_AES_CMAC) |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 179 | return -EINVAL; |
| 180 | break; |
| 181 | default: |
| 182 | return -EINVAL; |
| 183 | } |
| 184 | |
Jouni Malinen | 9f26a95 | 2009-05-15 12:38:32 +0300 | [diff] [blame] | 185 | if (params->seq) { |
| 186 | switch (params->cipher) { |
| 187 | case WLAN_CIPHER_SUITE_WEP40: |
| 188 | case WLAN_CIPHER_SUITE_WEP104: |
| 189 | /* These ciphers do not use key sequence */ |
| 190 | return -EINVAL; |
| 191 | case WLAN_CIPHER_SUITE_TKIP: |
| 192 | case WLAN_CIPHER_SUITE_CCMP: |
| 193 | case WLAN_CIPHER_SUITE_AES_CMAC: |
| 194 | if (params->seq_len != 6) |
| 195 | return -EINVAL; |
| 196 | break; |
| 197 | } |
| 198 | } |
| 199 | |
Johannes Berg | 0864512 | 2009-05-11 13:54:58 +0200 | [diff] [blame] | 200 | return 0; |
| 201 | } |
Zhu Yi | e31a16d | 2009-05-21 21:47:03 +0800 | [diff] [blame] | 202 | |
| 203 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ |
| 204 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ |
| 205 | const unsigned char rfc1042_header[] __aligned(2) = |
| 206 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; |
| 207 | EXPORT_SYMBOL(rfc1042_header); |
| 208 | |
| 209 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ |
| 210 | const unsigned char bridge_tunnel_header[] __aligned(2) = |
| 211 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; |
| 212 | EXPORT_SYMBOL(bridge_tunnel_header); |
| 213 | |
| 214 | unsigned int ieee80211_hdrlen(__le16 fc) |
| 215 | { |
| 216 | unsigned int hdrlen = 24; |
| 217 | |
| 218 | if (ieee80211_is_data(fc)) { |
| 219 | if (ieee80211_has_a4(fc)) |
| 220 | hdrlen = 30; |
| 221 | if (ieee80211_is_data_qos(fc)) |
| 222 | hdrlen += IEEE80211_QOS_CTL_LEN; |
| 223 | goto out; |
| 224 | } |
| 225 | |
| 226 | if (ieee80211_is_ctl(fc)) { |
| 227 | /* |
| 228 | * ACK and CTS are 10 bytes, all others 16. To see how |
| 229 | * to get this condition consider |
| 230 | * subtype mask: 0b0000000011110000 (0x00F0) |
| 231 | * ACK subtype: 0b0000000011010000 (0x00D0) |
| 232 | * CTS subtype: 0b0000000011000000 (0x00C0) |
| 233 | * bits that matter: ^^^ (0x00E0) |
| 234 | * value of those: 0b0000000011000000 (0x00C0) |
| 235 | */ |
| 236 | if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) |
| 237 | hdrlen = 10; |
| 238 | else |
| 239 | hdrlen = 16; |
| 240 | } |
| 241 | out: |
| 242 | return hdrlen; |
| 243 | } |
| 244 | EXPORT_SYMBOL(ieee80211_hdrlen); |
| 245 | |
| 246 | unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) |
| 247 | { |
| 248 | const struct ieee80211_hdr *hdr = |
| 249 | (const struct ieee80211_hdr *)skb->data; |
| 250 | unsigned int hdrlen; |
| 251 | |
| 252 | if (unlikely(skb->len < 10)) |
| 253 | return 0; |
| 254 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 255 | if (unlikely(hdrlen > skb->len)) |
| 256 | return 0; |
| 257 | return hdrlen; |
| 258 | } |
| 259 | EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); |
| 260 | |
| 261 | int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) |
| 262 | { |
| 263 | int ae = meshhdr->flags & MESH_FLAGS_AE; |
| 264 | /* 7.1.3.5a.2 */ |
| 265 | switch (ae) { |
| 266 | case 0: |
| 267 | return 6; |
| 268 | case 1: |
| 269 | return 12; |
| 270 | case 2: |
| 271 | return 18; |
| 272 | case 3: |
| 273 | return 24; |
| 274 | default: |
| 275 | return 6; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | int ieee80211_data_to_8023(struct sk_buff *skb, u8 *addr, |
| 280 | enum nl80211_iftype iftype) |
| 281 | { |
| 282 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 283 | u16 hdrlen, ethertype; |
| 284 | u8 *payload; |
| 285 | u8 dst[ETH_ALEN]; |
| 286 | u8 src[ETH_ALEN] __aligned(2); |
| 287 | |
| 288 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
| 289 | return -1; |
| 290 | |
| 291 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 292 | |
| 293 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet |
| 294 | * header |
| 295 | * IEEE 802.11 address fields: |
| 296 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 |
| 297 | * 0 0 DA SA BSSID n/a |
| 298 | * 0 1 DA BSSID SA n/a |
| 299 | * 1 0 BSSID SA DA n/a |
| 300 | * 1 1 RA TA DA SA |
| 301 | */ |
| 302 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
| 303 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); |
| 304 | |
| 305 | switch (hdr->frame_control & |
| 306 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { |
| 307 | case cpu_to_le16(IEEE80211_FCTL_TODS): |
| 308 | if (unlikely(iftype != NL80211_IFTYPE_AP && |
| 309 | iftype != NL80211_IFTYPE_AP_VLAN)) |
| 310 | return -1; |
| 311 | break; |
| 312 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
| 313 | if (unlikely(iftype != NL80211_IFTYPE_WDS && |
| 314 | iftype != NL80211_IFTYPE_MESH_POINT)) |
| 315 | return -1; |
| 316 | if (iftype == NL80211_IFTYPE_MESH_POINT) { |
| 317 | struct ieee80211s_hdr *meshdr = |
| 318 | (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| 319 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); |
| 320 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { |
| 321 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); |
| 322 | memcpy(src, meshdr->eaddr2, ETH_ALEN); |
| 323 | } |
| 324 | } |
| 325 | break; |
| 326 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): |
| 327 | if (iftype != NL80211_IFTYPE_STATION || |
| 328 | (is_multicast_ether_addr(dst) && |
| 329 | !compare_ether_addr(src, addr))) |
| 330 | return -1; |
| 331 | break; |
| 332 | case cpu_to_le16(0): |
| 333 | if (iftype != NL80211_IFTYPE_ADHOC) |
| 334 | return -1; |
| 335 | break; |
| 336 | } |
| 337 | |
| 338 | if (unlikely(skb->len - hdrlen < 8)) |
| 339 | return -1; |
| 340 | |
| 341 | payload = skb->data + hdrlen; |
| 342 | ethertype = (payload[6] << 8) | payload[7]; |
| 343 | |
| 344 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && |
| 345 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
| 346 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { |
| 347 | /* remove RFC1042 or Bridge-Tunnel encapsulation and |
| 348 | * replace EtherType */ |
| 349 | skb_pull(skb, hdrlen + 6); |
| 350 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); |
| 351 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); |
| 352 | } else { |
| 353 | struct ethhdr *ehdr; |
| 354 | __be16 len; |
| 355 | |
| 356 | skb_pull(skb, hdrlen); |
| 357 | len = htons(skb->len); |
| 358 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); |
| 359 | memcpy(ehdr->h_dest, dst, ETH_ALEN); |
| 360 | memcpy(ehdr->h_source, src, ETH_ALEN); |
| 361 | ehdr->h_proto = len; |
| 362 | } |
| 363 | return 0; |
| 364 | } |
| 365 | EXPORT_SYMBOL(ieee80211_data_to_8023); |
| 366 | |
| 367 | int ieee80211_data_from_8023(struct sk_buff *skb, u8 *addr, |
| 368 | enum nl80211_iftype iftype, u8 *bssid, bool qos) |
| 369 | { |
| 370 | struct ieee80211_hdr hdr; |
| 371 | u16 hdrlen, ethertype; |
| 372 | __le16 fc; |
| 373 | const u8 *encaps_data; |
| 374 | int encaps_len, skip_header_bytes; |
| 375 | int nh_pos, h_pos; |
| 376 | int head_need; |
| 377 | |
| 378 | if (unlikely(skb->len < ETH_HLEN)) |
| 379 | return -EINVAL; |
| 380 | |
| 381 | nh_pos = skb_network_header(skb) - skb->data; |
| 382 | h_pos = skb_transport_header(skb) - skb->data; |
| 383 | |
| 384 | /* convert Ethernet header to proper 802.11 header (based on |
| 385 | * operation mode) */ |
| 386 | ethertype = (skb->data[12] << 8) | skb->data[13]; |
| 387 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); |
| 388 | |
| 389 | switch (iftype) { |
| 390 | case NL80211_IFTYPE_AP: |
| 391 | case NL80211_IFTYPE_AP_VLAN: |
| 392 | fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); |
| 393 | /* DA BSSID SA */ |
| 394 | memcpy(hdr.addr1, skb->data, ETH_ALEN); |
| 395 | memcpy(hdr.addr2, addr, ETH_ALEN); |
| 396 | memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); |
| 397 | hdrlen = 24; |
| 398 | break; |
| 399 | case NL80211_IFTYPE_STATION: |
| 400 | fc |= cpu_to_le16(IEEE80211_FCTL_TODS); |
| 401 | /* BSSID SA DA */ |
| 402 | memcpy(hdr.addr1, bssid, ETH_ALEN); |
| 403 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
| 404 | memcpy(hdr.addr3, skb->data, ETH_ALEN); |
| 405 | hdrlen = 24; |
| 406 | break; |
| 407 | case NL80211_IFTYPE_ADHOC: |
| 408 | /* DA SA BSSID */ |
| 409 | memcpy(hdr.addr1, skb->data, ETH_ALEN); |
| 410 | memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); |
| 411 | memcpy(hdr.addr3, bssid, ETH_ALEN); |
| 412 | hdrlen = 24; |
| 413 | break; |
| 414 | default: |
| 415 | return -EOPNOTSUPP; |
| 416 | } |
| 417 | |
| 418 | if (qos) { |
| 419 | fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
| 420 | hdrlen += 2; |
| 421 | } |
| 422 | |
| 423 | hdr.frame_control = fc; |
| 424 | hdr.duration_id = 0; |
| 425 | hdr.seq_ctrl = 0; |
| 426 | |
| 427 | skip_header_bytes = ETH_HLEN; |
| 428 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { |
| 429 | encaps_data = bridge_tunnel_header; |
| 430 | encaps_len = sizeof(bridge_tunnel_header); |
| 431 | skip_header_bytes -= 2; |
| 432 | } else if (ethertype > 0x600) { |
| 433 | encaps_data = rfc1042_header; |
| 434 | encaps_len = sizeof(rfc1042_header); |
| 435 | skip_header_bytes -= 2; |
| 436 | } else { |
| 437 | encaps_data = NULL; |
| 438 | encaps_len = 0; |
| 439 | } |
| 440 | |
| 441 | skb_pull(skb, skip_header_bytes); |
| 442 | nh_pos -= skip_header_bytes; |
| 443 | h_pos -= skip_header_bytes; |
| 444 | |
| 445 | head_need = hdrlen + encaps_len - skb_headroom(skb); |
| 446 | |
| 447 | if (head_need > 0 || skb_cloned(skb)) { |
| 448 | head_need = max(head_need, 0); |
| 449 | if (head_need) |
| 450 | skb_orphan(skb); |
| 451 | |
| 452 | if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) { |
| 453 | printk(KERN_ERR "failed to reallocate Tx buffer\n"); |
| 454 | return -ENOMEM; |
| 455 | } |
| 456 | skb->truesize += head_need; |
| 457 | } |
| 458 | |
| 459 | if (encaps_data) { |
| 460 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); |
| 461 | nh_pos += encaps_len; |
| 462 | h_pos += encaps_len; |
| 463 | } |
| 464 | |
| 465 | memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); |
| 466 | |
| 467 | nh_pos += hdrlen; |
| 468 | h_pos += hdrlen; |
| 469 | |
| 470 | /* Update skb pointers to various headers since this modified frame |
| 471 | * is going to go through Linux networking code that may potentially |
| 472 | * need things like pointer to IP header. */ |
| 473 | skb_set_mac_header(skb, 0); |
| 474 | skb_set_network_header(skb, nh_pos); |
| 475 | skb_set_transport_header(skb, h_pos); |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | EXPORT_SYMBOL(ieee80211_data_from_8023); |
| 480 | |
| 481 | /* Given a data frame determine the 802.1p/1d tag to use. */ |
| 482 | unsigned int cfg80211_classify8021d(struct sk_buff *skb) |
| 483 | { |
| 484 | unsigned int dscp; |
| 485 | |
| 486 | /* skb->priority values from 256->263 are magic values to |
| 487 | * directly indicate a specific 802.1d priority. This is used |
| 488 | * to allow 802.1d priority to be passed directly in from VLAN |
| 489 | * tags, etc. |
| 490 | */ |
| 491 | if (skb->priority >= 256 && skb->priority <= 263) |
| 492 | return skb->priority - 256; |
| 493 | |
| 494 | switch (skb->protocol) { |
| 495 | case htons(ETH_P_IP): |
| 496 | dscp = ip_hdr(skb)->tos & 0xfc; |
| 497 | break; |
| 498 | default: |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | return dscp >> 5; |
| 503 | } |
| 504 | EXPORT_SYMBOL(cfg80211_classify8021d); |