/* * Wireless utility functions * * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> */#include <linux/export.h>#include <linux/bitops.h>#include <linux/etherdevice.h>#include <linux/slab.h>#include <net/cfg80211.h>#include <net/ip.h>#include <net/dsfield.h>#include <linux/if_vlan.h>#include "core.h"#include "rdev-ops.h" struct ieee80211_rate *ieee80211_get_response_rate(struct ieee80211_supported_band *sband, u32 basic_rates, int bitrate){ struct ieee80211_rate *result = &sband->bitrates[0]; int i; for (i = 0; i < sband->n_bitrates; i++) { if (!(basic_rates & BIT(i))) continue; if (sband->bitrates[i].bitrate > bitrate) continue; result = &sband->bitrates[i]; } return result;}EXPORT_SYMBOL(ieee80211_get_response_rate); u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband, enum nl80211_bss_scan_width scan_width){ struct ieee80211_rate *bitrates; u32 mandatory_rates = 0; enum ieee80211_rate_flags mandatory_flag; int i; if (WARN_ON(!sband)) return 1; if (sband->band == IEEE80211_BAND_2GHZ) { if (scan_width == NL80211_BSS_CHAN_WIDTH_5 || scan_width == NL80211_BSS_CHAN_WIDTH_10) mandatory_flag = IEEE80211_RATE_MANDATORY_G; else mandatory_flag = IEEE80211_RATE_MANDATORY_B; } else { mandatory_flag = IEEE80211_RATE_MANDATORY_A; } bitrates = sband->bitrates; for (i = 0; i < sband->n_bitrates; i++) if (bitrates[i].flags & mandatory_flag) mandatory_rates |= BIT(i); return mandatory_rates;}EXPORT_SYMBOL(ieee80211_mandatory_rates); int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band){ /* see 802.11 17.3.8.3.2 and Annex J * there are overlapping channel numbers in 5GHz and 2GHz bands */ if (chan <= 0) return 0; /* not supported */ switch (band) { case IEEE80211_BAND_2GHZ: if (chan == 14) return 2484; else if (chan < 14) return 2407 + chan * 5; break; case IEEE80211_BAND_5GHZ: if (chan >= 182 && chan <= 196) return 4000 + chan * 5; else return 5000 + chan * 5; break; case IEEE80211_BAND_60GHZ: if (chan < 5) return 56160 + chan * 2160; break; default: ; } return 0; /* not supported */}EXPORT_SYMBOL(ieee80211_channel_to_frequency); int ieee80211_frequency_to_channel(int freq){ /* see 802.11 17.3.8.3.2 and Annex J */ if (freq == 2484) return 14; else if (freq < 2484) return (freq - 2407) / 5; else if (freq >= 4910 && freq <= 4980) return (freq - 4000) / 5; else if (freq <= 45000) /* DMG band lower limit */ return (freq - 5000) / 5; else if (freq >= 58320 && freq <= 64800) return (freq - 56160) / 2160; else return 0;}EXPORT_SYMBOL(ieee80211_frequency_to_channel); struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, int freq){ enum ieee80211_band band; struct ieee80211_supported_band *sband; int i; for (band = 0; band < IEEE80211_NUM_BANDS; band++) { sband = wiphy->bands[band]; if (!sband) continue; for (i = 0; i < sband->n_channels; i++) { if (sband->channels[i].center_freq == freq) return &sband->channels[i]; } } return NULL;}EXPORT_SYMBOL(__ieee80211_get_channel); static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, enum ieee80211_band band){ int i, want; switch (band) { case IEEE80211_BAND_5GHZ: want = 3; for (i = 0; i < sband->n_bitrates; i++) { if (sband->bitrates[i].bitrate == 60 || sband->bitrates[i].bitrate == 120 || sband->bitrates[i].bitrate == 240) { sband->bitrates[i].flags |= IEEE80211_RATE_MANDATORY_A; want--; } } WARN_ON(want); break; case IEEE80211_BAND_2GHZ: want = 7; for (i = 0; i < sband->n_bitrates; i++) { if (sband->bitrates[i].bitrate == 10) { sband->bitrates[i].flags |= IEEE80211_RATE_MANDATORY_B | IEEE80211_RATE_MANDATORY_G; want--; } if (sband->bitrates[i].bitrate == 20 || sband->bitrates[i].bitrate == 55 || sband->bitrates[i].bitrate == 110 || sband->bitrates[i].bitrate == 60 || sband->bitrates[i].bitrate == 120 || sband->bitrates[i].bitrate == 240) { sband->bitrates[i].flags |= IEEE80211_RATE_MANDATORY_G; want--; } if (sband->bitrates[i].bitrate != 10 && sband->bitrates[i].bitrate != 20 && sband->bitrates[i].bitrate != 55 && sband->bitrates[i].bitrate != 110) sband->bitrates[i].flags |= IEEE80211_RATE_ERP_G; } WARN_ON(want != 0 && want != 3 && want != 6); break; case IEEE80211_BAND_60GHZ: /* check for mandatory HT MCS 1..4 */ WARN_ON(!sband->ht_cap.ht_supported); WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e); break; case IEEE80211_NUM_BANDS: WARN_ON(1); break; }} void ieee80211_set_bitrate_flags(struct wiphy *wiphy){ enum ieee80211_band band; for (band = 0; band < IEEE80211_NUM_BANDS; band++) if (wiphy->bands[band]) set_mandatory_flags_band(wiphy->bands[band], band);} bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher){ int i; for (i = 0; i < wiphy->n_cipher_suites; i++) if (cipher == wiphy->cipher_suites[i]) return true; return false;} int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, struct key_params *params, int key_idx, bool pairwise, const u8 *mac_addr){ if (key_idx > 5) return -EINVAL; if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)) return -EINVAL; if (pairwise && !mac_addr) return -EINVAL; /* * Disallow pairwise keys with non-zero index unless it's WEP * or a vendor specific cipher (because current deployments use * pairwise WEP keys with non-zero indices and for vendor specific * ciphers this should be validated in the driver or hardware level * - but 802.11i clearly specifies to use zero) */ if (pairwise && key_idx && ((params->cipher == WLAN_CIPHER_SUITE_TKIP) || (params->cipher == WLAN_CIPHER_SUITE_CCMP) || (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC))) return -EINVAL; switch (params->cipher) { case WLAN_CIPHER_SUITE_WEP40: if (params->key_len != WLAN_KEY_LEN_WEP40) return -EINVAL; break; case WLAN_CIPHER_SUITE_TKIP: if (params->key_len != WLAN_KEY_LEN_TKIP) return -EINVAL; break; case WLAN_CIPHER_SUITE_CCMP: if (params->key_len != WLAN_KEY_LEN_CCMP) return -EINVAL; break; case WLAN_CIPHER_SUITE_WEP104: if (params->key_len != WLAN_KEY_LEN_WEP104) return -EINVAL; break; case WLAN_CIPHER_SUITE_AES_CMAC: if (params->key_len != WLAN_KEY_LEN_AES_CMAC) return -EINVAL; break; default: /* * We don't know anything about this algorithm, * allow using it -- but the driver must check * all parameters! We still check below whether * or not the driver supports this algorithm, * of course. */ break; } if (params->seq) { switch (params->cipher) { case WLAN_CIPHER_SUITE_WEP40: case WLAN_CIPHER_SUITE_WEP104: /* These ciphers do not use key sequence */ return -EINVAL; case WLAN_CIPHER_SUITE_TKIP: case WLAN_CIPHER_SUITE_CCMP: case WLAN_CIPHER_SUITE_AES_CMAC: if (params->seq_len != 6) return -EINVAL; break; } } if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher)) return -EINVAL; return 0;} unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc){ unsigned int hdrlen = 24; if (ieee80211_is_data(fc)) { if (ieee80211_has_a4(fc)) hdrlen = 30; if (ieee80211_is_data_qos(fc)) { hdrlen += IEEE80211_QOS_CTL_LEN; if (ieee80211_has_order(fc)) hdrlen += IEEE80211_HT_CTL_LEN; } goto out; } if (ieee80211_is_ctl(fc)) { /* * ACK and CTS are 10 bytes, all others 16. To see how * to get this condition consider * subtype mask: 0b0000000011110000 (0x00F0) * ACK subtype: 0b0000000011010000 (0x00D0) * CTS subtype: 0b0000000011000000 (0x00C0) * bits that matter: ^^^ (0x00E0) * value of those: 0b0000000011000000 (0x00C0) */ if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) hdrlen = 10; else hdrlen = 16; }out: return hdrlen;}EXPORT_SYMBOL(ieee80211_hdrlen); unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb){ const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data; unsigned int hdrlen; if (unlikely(skb->len < 10)) return 0; hdrlen = ieee80211_hdrlen(hdr->frame_control); if (unlikely(hdrlen > skb->len)) return 0; return hdrlen;}EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr){ int ae = meshhdr->flags & MESH_FLAGS_AE; /* 802.11-2012, 8.2.4.7.3 */ switch (ae) { default: case 0: return 6; case MESH_FLAGS_AE_A4: return 12; case MESH_FLAGS_AE_A5_A6: return 18; }}EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen); int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, enum nl80211_iftype iftype){ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; u16 hdrlen, ethertype; u8 *payload; u8 dst[ETH_ALEN]; u8 src[ETH_ALEN] __aligned(2); if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) return -1; hdrlen = ieee80211_hdrlen(hdr->frame_control); /* convert IEEE 802.11 header + possible LLC headers into Ethernet * header * IEEE 802.11 address fields: * ToDS FromDS Addr1 Addr2 Addr3 Addr4 * 0 0 DA SA BSSID n/a * 0 1 DA BSSID SA n/a * 1 0 BSSID SA DA n/a * 1 1 RA TA DA SA */ memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); switch (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { case cpu_to_le16(IEEE80211_FCTL_TODS): if (unlikely(iftype != NL80211_IFTYPE_AP && iftype != NL80211_IFTYPE_AP_VLAN && iftype != NL80211_IFTYPE_P2P_GO)) return -1; break; case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): if (unlikely(iftype != NL80211_IFTYPE_WDS && iftype != NL80211_IFTYPE_MESH_POINT && iftype != NL80211_IFTYPE_AP_VLAN && iftype != NL80211_IFTYPE_STATION)) return -1; if (iftype == NL80211_IFTYPE_MESH_POINT) { struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); /* make sure meshdr->flags is on the linear part */ if (!pskb_may_pull(skb, hdrlen + 1)) return -1; if (meshdr->flags & MESH_FLAGS_AE_A4) return -1; if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), dst, ETH_ALEN); skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr2), src, ETH_ALEN); } hdrlen += ieee80211_get_mesh_hdrlen(meshdr); } break; case cpu_to_le16(IEEE80211_FCTL_FROMDS): if ((iftype != NL80211_IFTYPE_STATION && iftype != NL80211_IFTYPE_P2P_CLIENT && iftype != NL80211_IFTYPE_MESH_POINT) || (is_multicast_ether_addr(dst) && ether_addr_equal(src, addr))) return -1; if (iftype == NL80211_IFTYPE_MESH_POINT) { struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); /* make sure meshdr->flags is on the linear part */ if (!pskb_may_pull(skb, hdrlen + 1)) return -1; if (meshdr->flags & MESH_FLAGS_AE_A5_A6) return -1; if (meshdr->flags & MESH_FLAGS_AE_A4) skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), src, ETH_ALEN); hdrlen += ieee80211_get_mesh_hdrlen(meshdr); } break; case cpu_to_le16(0): if (iftype != NL80211_IFTYPE_ADHOC && iftype != NL80211_IFTYPE_STATION) return -1; break; } if (!pskb_may_pull(skb, hdrlen + 8)) return -1; payload = skb->data + hdrlen; ethertype = (payload[6] << 8) | payload[7]; if (likely((ether_addr_equal(payload, rfc1042_header) && ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || ether_addr_equal(payload, bridge_tunnel_header))) { /* remove RFC1042 or Bridge-Tunnel encapsulation and * replace EtherType */ skb_pull(skb, hdrlen + 6); memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); } else { struct ethhdr *ehdr; __be16 len; skb_pull(skb, hdrlen); len = htons(skb->len); ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); memcpy(ehdr->h_dest, dst, ETH_ALEN); memcpy(ehdr->h_source, src, ETH_ALEN); ehdr->h_proto = len; } return 0;}EXPORT_SYMBOL(ieee80211_data_to_8023); int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, enum nl80211_iftype iftype, u8 *bssid, bool qos){ struct ieee80211_hdr hdr; u16 hdrlen, ethertype; __le16 fc; const u8 *encaps_data; int encaps_len, skip_header_bytes; int nh_pos, h_pos; int head_need; if (unlikely(skb->len < ETH_HLEN)) return -EINVAL; nh_pos = skb_network_header(skb) - skb->data; h_pos = skb_transport_header(skb) - skb->data; /* convert Ethernet header to proper 802.11 header (based on * operation mode) */ ethertype = (skb->data[12] << 8) | skb->data[13]; fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); switch (iftype) { case NL80211_IFTYPE_AP:Lines 1–500 of 1474. 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/* * Wireless utility functions * * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> */ #include <linux/export.h> #include <linux/bitops.h> #include <linux/etherdevice.h> #include <linux/slab.h> #include <net/cfg80211.h> #include <net/ip.h> #include <net/dsfield.h> #include <linux/if_vlan.h> #include "core.h" #include "rdev-ops.h" struct ieee80211_rate * ieee80211_get_response_rate(struct ieee80211_supported_band *sband, u32 basic_rates, int bitrate) { struct ieee80211_rate *result = &sband->bitrates[0]; int i; for (i = 0; i < sband->n_bitrates; i++) { if (!(basic_rates & BIT(i))) continue; if (sband->bitrates[i].bitrate > bitrate) continue; result = &sband->bitrates[i]; } return result; } EXPORT_SYMBOL(ieee80211_get_response_rate); u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband, enum nl80211_bss_scan_width scan_width) { struct ieee80211_rate *bitrates; u32 mandatory_rates = 0; enum ieee80211_rate_flags mandatory_flag; int i; if (WARN_ON(!sband)) return 1; if (sband->band == IEEE80211_BAND_2GHZ) { if (scan_width == NL80211_BSS_CHAN_WIDTH_5 || scan_width == NL80211_BSS_CHAN_WIDTH_10) mandatory_flag = IEEE80211_RATE_MANDATORY_G; else mandatory_flag = IEEE80211_RATE_MANDATORY_B; } else { mandatory_flag = IEEE80211_RATE_MANDATORY_A; } bitrates = sband->bitrates; for (i = 0; i < sband->n_bitrates; i++) if (bitrates[i].flags & mandatory_flag) mandatory_rates |= BIT(i); return mandatory_rates; } EXPORT_SYMBOL(ieee80211_mandatory_rates); int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band) { /* see 802.11 17.3.8.3.2 and Annex J * there are overlapping channel numbers in 5GHz and 2GHz bands */ if (chan <= 0) return 0; /* not supported */ switch (band) { case IEEE80211_BAND_2GHZ: if (chan == 14) return 2484; else if (chan < 14) return 2407 + chan * 5; break; case IEEE80211_BAND_5GHZ: if (chan >= 182 && chan <= 196) return 4000 + chan * 5; else return 5000 + chan * 5; break; case IEEE80211_BAND_60GHZ: if (chan < 5) return 56160 + chan * 2160; break; default: ; } return 0; /* not supported */ } EXPORT_SYMBOL(ieee80211_channel_to_frequency); int ieee80211_frequency_to_channel(int freq) { /* see 802.11 17.3.8.3.2 and Annex J */ if (freq == 2484) return 14; else if (freq < 2484) return (freq - 2407) / 5; else if (freq >= 4910 && freq <= 4980) return (freq - 4000) / 5; else if (freq <= 45000) /* DMG band lower limit */ return (freq - 5000) / 5; else if (freq >= 58320 && freq <= 64800) return (freq - 56160) / 2160; else return 0; } EXPORT_SYMBOL(ieee80211_frequency_to_channel); struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, int freq) { enum ieee80211_band band; struct ieee80211_supported_band *sband; int i; for (band = 0; band < IEEE80211_NUM_BANDS; band++) { sband = wiphy->bands[band]; if (!sband) continue; for (i = 0; i < sband->n_channels; i++) { if (sband->channels[i].center_freq == freq) return &sband->channels[i]; } } return NULL; } EXPORT_SYMBOL(__ieee80211_get_channel); static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, enum ieee80211_band band) { int i, want; switch (band) { case IEEE80211_BAND_5GHZ: want = 3; for (i = 0; i < sband->n_bitrates; i++) { if (sband->bitrates[i].bitrate == 60 || sband->bitrates[i].bitrate == 120 || sband->bitrates[i].bitrate == 240) { sband->bitrates[i].flags |= IEEE80211_RATE_MANDATORY_A; want--; } } WARN_ON(want); break; case IEEE80211_BAND_2GHZ: want = 7; for (i = 0; i < sband->n_bitrates; i++) { if (sband->bitrates[i].bitrate == 10) { sband->bitrates[i].flags |= IEEE80211_RATE_MANDATORY_B | IEEE80211_RATE_MANDATORY_G; want--; } if (sband->bitrates[i].bitrate == 20 || sband->bitrates[i].bitrate == 55 || sband->bitrates[i].bitrate == 110 || sband->bitrates[i].bitrate == 60 || sband->bitrates[i].bitrate == 120 || sband->bitrates[i].bitrate == 240) { sband->bitrates[i].flags |= IEEE80211_RATE_MANDATORY_G; want--; } if (sband->bitrates[i].bitrate != 10 && sband->bitrates[i].bitrate != 20 && sband->bitrates[i].bitrate != 55 && sband->bitrates[i].bitrate != 110) sband->bitrates[i].flags |= IEEE80211_RATE_ERP_G; } WARN_ON(want != 0 && want != 3 && want != 6); break; case IEEE80211_BAND_60GHZ: /* check for mandatory HT MCS 1..4 */ WARN_ON(!sband->ht_cap.ht_supported); WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e); break; case IEEE80211_NUM_BANDS: WARN_ON(1); break; } } void ieee80211_set_bitrate_flags(struct wiphy *wiphy) { enum ieee80211_band band; for (band = 0; band < IEEE80211_NUM_BANDS; band++) if (wiphy->bands[band]) set_mandatory_flags_band(wiphy->bands[band], band); } bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher) { int i; for (i = 0; i < wiphy->n_cipher_suites; i++) if (cipher == wiphy->cipher_suites[i]) return true; return false; } int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, struct key_params *params, int key_idx, bool pairwise, const u8 *mac_addr) { if (key_idx > 5) return -EINVAL; if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)) return -EINVAL; if (pairwise && !mac_addr) return -EINVAL; /* * Disallow pairwise keys with non-zero index unless it's WEP * or a vendor specific cipher (because current deployments use * pairwise WEP keys with non-zero indices and for vendor specific * ciphers this should be validated in the driver or hardware level * - but 802.11i clearly specifies to use zero) */ if (pairwise && key_idx && ((params->cipher == WLAN_CIPHER_SUITE_TKIP) || (params->cipher == WLAN_CIPHER_SUITE_CCMP) || (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC))) return -EINVAL; switch (params->cipher) { case WLAN_CIPHER_SUITE_WEP40: if (params->key_len != WLAN_KEY_LEN_WEP40) return -EINVAL; break; case WLAN_CIPHER_SUITE_TKIP: if (params->key_len != WLAN_KEY_LEN_TKIP) return -EINVAL; break; case WLAN_CIPHER_SUITE_CCMP: if (params->key_len != WLAN_KEY_LEN_CCMP) return -EINVAL; break; case WLAN_CIPHER_SUITE_WEP104: if (params->key_len != WLAN_KEY_LEN_WEP104) return -EINVAL; break; case WLAN_CIPHER_SUITE_AES_CMAC: if (params->key_len != WLAN_KEY_LEN_AES_CMAC) return -EINVAL; break; default: /* * We don't know anything about this algorithm, * allow using it -- but the driver must check * all parameters! We still check below whether * or not the driver supports this algorithm, * of course. */ break; } if (params->seq) { switch (params->cipher) { case WLAN_CIPHER_SUITE_WEP40: case WLAN_CIPHER_SUITE_WEP104: /* These ciphers do not use key sequence */ return -EINVAL; case WLAN_CIPHER_SUITE_TKIP: case WLAN_CIPHER_SUITE_CCMP: case WLAN_CIPHER_SUITE_AES_CMAC: if (params->seq_len != 6) return -EINVAL; break; } } if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher)) return -EINVAL; return 0; } unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc) { unsigned int hdrlen = 24; if (ieee80211_is_data(fc)) { if (ieee80211_has_a4(fc)) hdrlen = 30; if (ieee80211_is_data_qos(fc)) { hdrlen += IEEE80211_QOS_CTL_LEN; if (ieee80211_has_order(fc)) hdrlen += IEEE80211_HT_CTL_LEN; } goto out; } if (ieee80211_is_ctl(fc)) { /* * ACK and CTS are 10 bytes, all others 16. To see how * to get this condition consider * subtype mask: 0b0000000011110000 (0x00F0) * ACK subtype: 0b0000000011010000 (0x00D0) * CTS subtype: 0b0000000011000000 (0x00C0) * bits that matter: ^^^ (0x00E0) * value of those: 0b0000000011000000 (0x00C0) */ if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) hdrlen = 10; else hdrlen = 16; } out: return hdrlen; } EXPORT_SYMBOL(ieee80211_hdrlen); unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) { const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data; unsigned int hdrlen; if (unlikely(skb->len < 10)) return 0; hdrlen = ieee80211_hdrlen(hdr->frame_control); if (unlikely(hdrlen > skb->len)) return 0; return hdrlen; } EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) { int ae = meshhdr->flags & MESH_FLAGS_AE; /* 802.11-2012, 8.2.4.7.3 */ switch (ae) { default: case 0: return 6; case MESH_FLAGS_AE_A4: return 12; case MESH_FLAGS_AE_A5_A6: return 18; } } EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen); int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, enum nl80211_iftype iftype) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; u16 hdrlen, ethertype; u8 *payload; u8 dst[ETH_ALEN]; u8 src[ETH_ALEN] __aligned(2); if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) return -1; hdrlen = ieee80211_hdrlen(hdr->frame_control); /* convert IEEE 802.11 header + possible LLC headers into Ethernet * header * IEEE 802.11 address fields: * ToDS FromDS Addr1 Addr2 Addr3 Addr4 * 0 0 DA SA BSSID n/a * 0 1 DA BSSID SA n/a * 1 0 BSSID SA DA n/a * 1 1 RA TA DA SA */ memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); switch (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { case cpu_to_le16(IEEE80211_FCTL_TODS): if (unlikely(iftype != NL80211_IFTYPE_AP && iftype != NL80211_IFTYPE_AP_VLAN && iftype != NL80211_IFTYPE_P2P_GO)) return -1; break; case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): if (unlikely(iftype != NL80211_IFTYPE_WDS && iftype != NL80211_IFTYPE_MESH_POINT && iftype != NL80211_IFTYPE_AP_VLAN && iftype != NL80211_IFTYPE_STATION)) return -1; if (iftype == NL80211_IFTYPE_MESH_POINT) { struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); /* make sure meshdr->flags is on the linear part */ if (!pskb_may_pull(skb, hdrlen + 1)) return -1; if (meshdr->flags & MESH_FLAGS_AE_A4) return -1; if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), dst, ETH_ALEN); skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr2), src, ETH_ALEN); } hdrlen += ieee80211_get_mesh_hdrlen(meshdr); } break; case cpu_to_le16(IEEE80211_FCTL_FROMDS): if ((iftype != NL80211_IFTYPE_STATION && iftype != NL80211_IFTYPE_P2P_CLIENT && iftype != NL80211_IFTYPE_MESH_POINT) || (is_multicast_ether_addr(dst) && ether_addr_equal(src, addr))) return -1; if (iftype == NL80211_IFTYPE_MESH_POINT) { struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); /* make sure meshdr->flags is on the linear part */ if (!pskb_may_pull(skb, hdrlen + 1)) return -1; if (meshdr->flags & MESH_FLAGS_AE_A5_A6) return -1; if (meshdr->flags & MESH_FLAGS_AE_A4) skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), src, ETH_ALEN); hdrlen += ieee80211_get_mesh_hdrlen(meshdr); } break; case cpu_to_le16(0): if (iftype != NL80211_IFTYPE_ADHOC && iftype != NL80211_IFTYPE_STATION) return -1; break; } if (!pskb_may_pull(skb, hdrlen + 8)) return -1; payload = skb->data + hdrlen; ethertype = (payload[6] << 8) | payload[7]; if (likely((ether_addr_equal(payload, rfc1042_header) && ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || ether_addr_equal(payload, bridge_tunnel_header))) { /* remove RFC1042 or Bridge-Tunnel encapsulation and * replace EtherType */ skb_pull(skb, hdrlen + 6); memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); } else { struct ethhdr *ehdr; __be16 len; skb_pull(skb, hdrlen); len = htons(skb->len); ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); memcpy(ehdr->h_dest, dst, ETH_ALEN); memcpy(ehdr->h_source, src, ETH_ALEN); ehdr->h_proto = len; } return 0; } EXPORT_SYMBOL(ieee80211_data_to_8023); int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, enum nl80211_iftype iftype, u8 *bssid, bool qos) { struct ieee80211_hdr hdr; u16 hdrlen, ethertype; __le16 fc; const u8 *encaps_data; int encaps_len, skip_header_bytes; int nh_pos, h_pos; int head_need; if (unlikely(skb->len < ETH_HLEN)) return -EINVAL; nh_pos = skb_network_header(skb) - skb->data; h_pos = skb_transport_header(skb) - skb->data; /* convert Ethernet header to proper 802.11 header (based on * operation mode) */ ethertype = (skb->data[12] << 8) | skb->data[13]; fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); switch (iftype) { case NL80211_IFTYPE_AP: