cregit-Linux how code gets into the kernel

Release 4.8 net/wireless/util.c

Directory: net/wireless
/*
 * Wireless utility functions
 *
 * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 */
#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 <linux/mpls.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; }

Contributors

PersonTokensPropCommitsCommitProp
johannes bergjohannes berg91100.00%2100.00%
Total91100.00%2100.00%

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 == NL80211_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; }

Contributors

PersonTokensPropCommitsCommitProp
ashok nagarajanashok nagarajan9680.00%133.33%
simon wunderlichsimon wunderlich2319.17%133.33%
johannes bergjohannes berg10.83%133.33%
Total120100.00%3100.00%

EXPORT_SYMBOL(ieee80211_mandatory_rates);
int ieee80211_channel_to_frequency(int chan, enum nl80211_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 NL80211_BAND_2GHZ: if (chan == 14) return 2484; else if (chan < 14) return 2407 + chan * 5; break; case NL80211_BAND_5GHZ: if (chan >= 182 && chan <= 196) return 4000 + chan * 5; else return 5000 + chan * 5; break; case NL80211_BAND_60GHZ: if (chan < 5) return 56160 + chan * 2160; break; default: ; } return 0; /* not supported */ }

Contributors

PersonTokensPropCommitsCommitProp
vladimir kondratievvladimir kondratiev4844.44%125.00%
bruno randolfbruno randolf3532.41%125.00%
johannes bergjohannes berg2523.15%250.00%
Total108100.00%4100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
johannes bergjohannes berg3840.00%133.33%
vladimir kondratievvladimir kondratiev3233.68%133.33%
bruno randolfbruno randolf2526.32%133.33%
Total95100.00%3100.00%

EXPORT_SYMBOL(ieee80211_frequency_to_channel);
struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, int freq) { enum nl80211_band band; struct ieee80211_supported_band *sband; int i; for (band = 0; band < NUM_NL80211_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; }

Contributors

PersonTokensPropCommitsCommitProp
johannes bergjohannes berg99100.00%3100.00%
Total99100.00%3100.00%

EXPORT_SYMBOL(__ieee80211_get_channel);
static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, enum nl80211_band band) { int i, want; switch (band) { case NL80211_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 NL80211_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 NL80211_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 NUM_NL80211_BANDS: WARN_ON(1); break; } }

Contributors

PersonTokensPropCommitsCommitProp
johannes bergjohannes berg32589.53%360.00%
vladimir kondratievvladimir kondratiev349.37%120.00%
ivo van doornivo van doorn41.10%120.00%
Total363100.00%5100.00%


void ieee80211_set_bitrate_flags(struct wiphy *wiphy) { enum nl80211_band band; for (band = 0; band < NUM_NL80211_BANDS; band++) if (wiphy->bands[band]) set_mandatory_flags_band(wiphy->bands[band], band); }

Contributors

PersonTokensPropCommitsCommitProp
johannes bergjohannes berg48100.00%2100.00%
Total48100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
jouni malinenjouni malinen48100.00%1100.00%
Total48100.00%1100.00%


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; switch (params->cipher) { case WLAN_CIPHER_SUITE_TKIP: case WLAN_CIPHER_SUITE_CCMP: case WLAN_CIPHER_SUITE_CCMP_256: case WLAN_CIPHER_SUITE_GCMP: case WLAN_CIPHER_SUITE_GCMP_256: /* 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) return -EINVAL; break; case WLAN_CIPHER_SUITE_AES_CMAC: case WLAN_CIPHER_SUITE_BIP_CMAC_256: case WLAN_CIPHER_SUITE_BIP_GMAC_128: case WLAN_CIPHER_SUITE_BIP_GMAC_256: /* Disallow BIP (group-only) cipher as pairwise cipher */ if (pairwise) return -EINVAL; break; default: break; } 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_CCMP_256: if (params->key_len != WLAN_KEY_LEN_CCMP_256) return -EINVAL; break; case WLAN_CIPHER_SUITE_GCMP: if (params->key_len != WLAN_KEY_LEN_GCMP) return -EINVAL; break; case WLAN_CIPHER_SUITE_GCMP_256: if (params->key_len != WLAN_KEY_LEN_GCMP_256) 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; case WLAN_CIPHER_SUITE_BIP_CMAC_256: if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256) return -EINVAL; break; case WLAN_CIPHER_SUITE_BIP_GMAC_128: if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128) return -EINVAL; break; case WLAN_CIPHER_SUITE_BIP_GMAC_256: if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256) 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_CCMP_256: case WLAN_CIPHER_SUITE_GCMP: case WLAN_CIPHER_SUITE_GCMP_256: case WLAN_CIPHER_SUITE_AES_CMAC: case WLAN_CIPHER_SUITE_BIP_CMAC_256: case WLAN_CIPHER_SUITE_BIP_GMAC_128: case WLAN_CIPHER_SUITE_BIP_GMAC_256: if (params->seq_len != 6) return -EINVAL; break; } } if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher)) return -EINVAL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jouni malinenjouni malinen21853.96%440.00%
johannes bergjohannes berg18345.30%550.00%
juuso oikarinenjuuso oikarinen30.74%110.00%
Total404100.00%10100.00%


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_mgmt(fc)) { 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; }

Contributors

PersonTokensPropCommitsCommitProp
yi zhuyi zhu8970.63%125.00%
fred choufred chou2318.25%125.00%
andriy tkachukandriy tkachuk1310.32%125.00%
johannes bergjohannes berg10.79%125.00%
Total126100.00%4100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
yi zhuyi zhu72100.00%1100.00%
Total72100.00%1100.00%

EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags) { int ae = 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; } }

Contributors

PersonTokensPropCommitsCommitProp
yi zhuyi zhu3479.07%120.00%
felix fietkaufelix fietkau49.30%120.00%
johannes bergjohannes berg36.98%240.00%
javier cardonajavier cardona24.65%120.00%
Total43100.00%5100.00%


unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) { return __ieee80211_get_mesh_hdrlen(meshhdr->flags); }

Contributors

PersonTokensPropCommitsCommitProp
felix fietkaufelix fietkau19100.00%1100.00%
Total19100.00%1100.00%

EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
static int __ieee80211_data_to_8023(struct sk_buff *skb, struct ethhdr *ehdr, const u8 *addr, enum nl80211_iftype iftype) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; struct { u8 hdr[ETH_ALEN] __aligned(2); __be16 proto; } payload; struct ethhdr tmp; u16 hdrlen; u8 mesh_flags = 0; if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) return -1; hdrlen = ieee80211_hdrlen(hdr->frame_control); if (skb->len < hdrlen + 8) return -1; /* 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(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN); memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN); if (iftype == NL80211_IFTYPE_MESH_POINT) skb_copy_bits(skb, hdrlen, &mesh_flags, 1); 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) { if (mesh_flags & MESH_FLAGS_AE_A4) return -1; if (mesh_flags & MESH_FLAGS_AE_A5_A6) { skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), tmp.h_dest, 2 * ETH_ALEN); } hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags); } 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(tmp.h_dest) && ether_addr_equal(tmp.h_source, addr))) return -1; if (iftype == NL80211_IFTYPE_MESH_POINT) { if (mesh_flags & MESH_FLAGS_AE_A5_A6) return -1; if (mesh_flags & MESH_FLAGS_AE_A4) skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), tmp.h_source, ETH_ALEN); hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags); } break; case cpu_to_le16(0): if (iftype != NL80211_IFTYPE_ADHOC && iftype != NL80211_IFTYPE_STATION && iftype != NL80211_IFTYPE_OCB) return -1; break; } skb_copy_bits(skb, hdrlen, &payload, sizeof(payload)); tmp.h_proto = payload.proto; if (likely((ether_addr_equal(payload.hdr, rfc1042_header) && tmp.h_proto != htons(ETH_P_AARP) && tmp.h_proto != htons(ETH_P_IPX)) || ether_addr_equal(payload.hdr, bridge_tunnel_header))) /* remove RFC1042 or Bridge-Tunnel encapsulation and * replace EtherType */ hdrlen += ETH_ALEN + 2; else tmp.h_proto = htons(skb->len - hdrlen); pskb_pull(skb, hdrlen); if (!ehdr) ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); memcpy(ehdr, &tmp, sizeof(tmp)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
yi zhuyi zhu32860.29%325.00%
felix fietkaufelix fietkau15528.49%325.00%
johannes bergjohannes berg264.78%216.67%
javier cardonajavier cardona244.41%18.33%
arik nemtsovarik nemtsov40.74%18.33%
rostislav lisovyrostislav lisovy40.74%18.33%
joe perchesjoe perches30.55%18.33%
Total544100.00%12100.00%


int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, enum nl80211_iftype iftype) { return __ieee80211_data_to_8023(skb, NULL, addr, iftype); }

Contributors

PersonTokensPropCommitsCommitProp
felix fietkaufelix fietkau2580.65%150.00%
yi zhuyi zhu619.35%150.00%
Total31100.00%2100.00%

EXPORT_SYMBOL(ieee80211_data_to_8023);
int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, enum nl80211_iftype iftype, const 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: case NL80211_IFTYPE_AP_VLAN: case NL80211_IFTYPE_P2P_GO: fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); /* DA BSSID SA */ memcpy(hdr.addr1, skb->data, ETH_ALEN); memcpy(hdr.addr2, addr, ETH_ALEN); memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); hdrlen = 24; break; case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_P2P_CLIENT: fc |= cpu_to_le16(IEEE80211_FCTL_TODS); /* BSSID SA DA */ memcpy(hdr.addr1, bssid, ETH_ALEN); memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); memcpy(hdr.addr3, skb->data, ETH_ALEN); hdrlen = 24; break; case NL80211_IFTYPE_OCB: case NL80211_IFTYPE_ADHOC: /* DA SA BSSID */ memcpy(hdr.addr1, skb->data, ETH_ALEN); memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); memcpy(hdr.addr3, bssid, ETH_ALEN); hdrlen = 24; break; default: return -EOPNOTSUPP; } if (qos) { fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); hdrlen += 2; } hdr.frame_control = fc; hdr.duration_id = 0; hdr.seq_ctrl = 0; skip_header_bytes = ETH_HLEN; if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { encaps_data = bridge_tunnel_header; encaps_len = sizeof(bridge_tunnel_header); skip_header_bytes -= 2; } else if (ethertype >= ETH_P_802_3_MIN) { encaps_data = rfc1042_header; encaps_len = sizeof(rfc1042_header); skip_header_bytes -= 2; } else { encaps_data = NULL; encaps_len = 0; } skb_pull(skb, skip_header_bytes); nh_pos -= skip_header_bytes; h_pos -= skip_header_bytes; head_need = hdrlen + encaps_len - skb_headroom(skb); if (head_need > 0 || skb_cloned(skb)) { head_need = max(head_need, 0); if (head_need) skb_orphan(skb); if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) return -ENOMEM; skb->truesize += head_need; } if (encaps_data) { memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); nh_pos += encaps_len; h_pos += encaps_len; } memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); nh_pos += hdrlen; h_pos += hdrlen; /* Update skb pointers to various headers since this modified frame * is going to go through Linux networking code that may potentially * need things like pointer to IP header. */ skb_reset_mac_header(skb); skb_set_network_header(skb, nh_pos); skb_set_transport_header(skb, h_pos); return