/* * lib80211 crypt: host-based WEP encryption implementation for lib80211 * * Copyright (c) 2002-2004, Jouni Malinen * Copyright (c) 2008, John W. Linville * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. See README and COPYING for * more details. */ #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Jouni Malinen"); MODULE_DESCRIPTION("lib80211 crypt: WEP"); MODULE_LICENSE("GPL"); struct lib80211_wep_data { u32 iv; #define WEP_KEY_LEN 13 u8 key[WEP_KEY_LEN + 1]; u8 key_len; u8 key_idx; struct crypto_skcipher *tx_tfm; struct crypto_skcipher *rx_tfm; }; static void *lib80211_wep_init(int keyidx) { struct lib80211_wep_data *priv; priv = kzalloc(sizeof(*priv), GFP_ATOMIC); if (priv == NULL) goto fail; priv->key_idx = keyidx; priv->tx_tfm = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); if (IS_ERR(priv->tx_tfm)) { priv->tx_tfm = NULL; goto fail; } priv->rx_tfm = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); if (IS_ERR(priv->rx_tfm)) { priv->rx_tfm = NULL; goto fail; } /* start WEP IV from a random value */ get_random_bytes(&priv->iv, 4); return priv; fail: if (priv) { crypto_free_skcipher(priv->tx_tfm); crypto_free_skcipher(priv->rx_tfm); kfree(priv); } return NULL; } static void lib80211_wep_deinit(void *priv) { struct lib80211_wep_data *_priv = priv; if (_priv) { crypto_free_skcipher(_priv->tx_tfm); crypto_free_skcipher(_priv->rx_tfm); } kfree(priv); } /* Add WEP IV/key info to a frame that has at least 4 bytes of headroom */ static int lib80211_wep_build_iv(struct sk_buff *skb, int hdr_len, u8 *key, int keylen, void *priv) { struct lib80211_wep_data *wep = priv; u32 klen; u8 *pos; if (skb_headroom(skb) < 4 || skb->len < hdr_len) return -1; pos = skb_push(skb, 4); memmove(pos, pos + 4, hdr_len); pos += hdr_len; klen = 3 + wep->key_len; wep->iv++; /* Fluhrer, Mantin, and Shamir have reported weaknesses in the key * scheduling algorithm of RC4. At least IVs (KeyByte + 3, 0xff, N) * can be used to speedup attacks, so avoid using them. */ if ((wep->iv & 0xff00) == 0xff00) { u8 B = (wep->iv >> 16) & 0xff; if (B >= 3 && B < klen) wep->iv += 0x0100; } /* Prepend 24-bit IV to RC4 key and TX frame */ *pos++ = (wep->iv >> 16) & 0xff; *pos++ = (wep->iv >> 8) & 0xff; *pos++ = wep->iv & 0xff; *pos++ = wep->key_idx << 6; return 0; } /* Perform WEP encryption on given skb that has at least 4 bytes of headroom * for IV and 4 bytes of tailroom for ICV. Both IV and ICV will be transmitted, * so the payload length increases with 8 bytes. * * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data)) */ static int lib80211_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv) { struct lib80211_wep_data *wep = priv; SKCIPHER_REQUEST_ON_STACK(req, wep->tx_tfm); u32 crc, klen, len; u8 *pos, *icv; struct scatterlist sg; u8 key[WEP_KEY_LEN + 3]; int err; /* other checks are in lib80211_wep_build_iv */ if (skb_tailroom(skb) < 4) return -1; /* add the IV to the frame */ if (lib80211_wep_build_iv(skb, hdr_len, NULL, 0, priv)) return -1; /* Copy the IV into the first 3 bytes of the key */ skb_copy_from_linear_data_offset(skb, hdr_len, key, 3); /* Copy rest of the WEP key (the secret part) */ memcpy(key + 3, wep->key, wep->key_len); len = skb->len - hdr_len - 4; pos = skb->data + hdr_len + 4; klen = 3 + wep->key_len; /* Append little-endian CRC32 over only the data and encrypt it to produce ICV */ crc = ~crc32_le(~0, pos, len); icv = skb_put(skb, 4); icv[0] = crc; icv[1] = crc >> 8; icv[2] = crc >> 16; icv[3] = crc >> 24; crypto_skcipher_setkey(wep->tx_tfm, key, klen); sg_init_one(&sg, pos, len + 4); skcipher_request_set_tfm(req, wep->tx_tfm); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, &sg, &sg, len + 4, NULL); err = crypto_skcipher_encrypt(req); skcipher_request_zero(req); return err; } /* Perform WEP decryption on given buffer. Buffer includes whole WEP part of * the frame: IV (4 bytes), encrypted payload (including SNAP header), * ICV (4 bytes). len includes both IV and ICV. * * Returns 0 if frame was decrypted successfully and ICV was correct and -1 on * failure. If frame is OK, IV and ICV will be removed. */ static int lib80211_wep_decrypt(struct sk_buff *skb, int hdr_len, void *priv) { struct lib80211_wep_data *wep = priv; SKCIPHER_REQUEST_ON_STACK(req, wep->rx_tfm); u32 crc, klen, plen; u8 key[WEP_KEY_LEN + 3]; u8 keyidx, *pos, icv[4]; struct scatterlist sg; int err; if (skb->len < hdr_len + 8) return -1; pos = skb->data + hdr_len; key[0] = *pos++; key[1] = *pos++; key[2] = *pos++; keyidx = *pos++ >> 6; if (keyidx != wep->key_idx) return -1; klen = 3 + wep->key_len; /* Copy rest of the WEP key (the secret part) */ memcpy(key + 3, wep->key, wep->key_len); /* Apply RC4 to data and compute CRC32 over decrypted data */ plen = skb->len - hdr_len - 8; crypto_skcipher_setkey(wep->rx_tfm, key, klen); sg_init_one(&sg, pos, plen + 4); skcipher_request_set_tfm(req, wep->rx_tfm); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, &sg, &sg, plen + 4, NULL); err = crypto_skcipher_decrypt(req); skcipher_request_zero(req); if (err) return -7; crc = ~crc32_le(~0, pos, plen); icv[0] = crc; icv[1] = crc >> 8; icv[2] = crc >> 16; icv[3] = crc >> 24; if (memcmp(icv, pos + plen, 4) != 0) { /* ICV mismatch - drop frame */ return -2; } /* Remove IV and ICV */ memmove(skb->data + 4, skb->data, hdr_len); skb_pull(skb, 4); skb_trim(skb, skb->len - 4); return 0; } static int lib80211_wep_set_key(void *key, int len, u8 * seq, void *priv) { struct lib80211_wep_data *wep = priv; if (len < 0 || len > WEP_KEY_LEN) return -1; memcpy(wep->key, key, len); wep->key_len = len; return 0; } static int lib80211_wep_get_key(void *key, int len, u8 * seq, void *priv) { struct lib80211_wep_data *wep = priv; if (len < wep->key_len) return -1; memcpy(key, wep->key, wep->key_len); return wep->key_len; } static void lib80211_wep_print_stats(struct seq_file *m, void *priv) { struct lib80211_wep_data *wep = priv; seq_printf(m, "key[%d] alg=WEP len=%d\n", wep->key_idx, wep->key_len); } static struct lib80211_crypto_ops lib80211_crypt_wep = { .name = "WEP", .init = lib80211_wep_init, .deinit = lib80211_wep_deinit, .encrypt_mpdu = lib80211_wep_encrypt, .decrypt_mpdu = lib80211_wep_decrypt, .encrypt_msdu = NULL, .decrypt_msdu = NULL, .set_key = lib80211_wep_set_key, .get_key = lib80211_wep_get_key, .print_stats = lib80211_wep_print_stats, .extra_mpdu_prefix_len = 4, /* IV */ .extra_mpdu_postfix_len = 4, /* ICV */ .owner = THIS_MODULE, }; static int __init lib80211_crypto_wep_init(void) { return lib80211_register_crypto_ops(&lib80211_crypt_wep); } static void __exit lib80211_crypto_wep_exit(void) { lib80211_unregister_crypto_ops(&lib80211_crypt_wep); } module_init(lib80211_crypto_wep_init); module_exit(lib80211_crypto_wep_exit); cgi/linux/net-next.git/plain/include/drm/drm_bridge.h?id=a8496eb81342393e4c8280a5ec27e1872a3fb9fd'>plain -rw-r--r--drm_cache.h1763logplain -rw-r--r--drm_color_mgmt.h2166logplain -rw-r--r--drm_connector.h28975logplain -rw-r--r--drm_crtc.h28999logplain -rw-r--r--drm_crtc_helper.h3301logplain -rw-r--r--drm_debugfs_crc.h2670logplain -rw-r--r--drm_displayid.h2850logplain -rw-r--r--drm_dp_dual_mode_helper.h4532logplain -rw-r--r--drm_dp_helper.h30638logplain -rw-r--r--drm_dp_mst_helper.h16260logplain -rw-r--r--drm_drv.h14861logplain -rw-r--r--drm_edid.h14335logplain -rw-r--r--drm_encoder.h8160logplain -rw-r--r--drm_encoder_slave.h6583logplain -rw-r--r--drm_fb_cma_helper.h1929logplain -rw-r--r--drm_fb_helper.h15125logplain -rw-r--r--drm_fixed.h4825logplain -rw-r--r--drm_flip_work.h3071logplain -rw-r--r--drm_fourcc.h2748logplain -rw-r--r--drm_framebuffer.h9623logplain -rw-r--r--drm_gem.h8052logplain -rw-r--r--drm_gem_cma_helper.h2286logplain -rw-r--r--drm_global.h2011logplain -rw-r--r--drm_hashtab.h3139logplain -rw-r--r--drm_irq.h6323logplain -rw-r--r--drm_legacy.h6933logplain -rw-r--r--drm_mem_util.h2468logplain -rw-r--r--drm_mipi_dsi.h10327logplain -rw-r--r--drm_mm.h11462logplain -rw-r--r--drm_mode_config.h23728logplain -rw-r--r--drm_mode_object.h4911logplain -rw-r--r--drm_modes.h17078logplain -rw-r--r--drm_modeset_helper.h1576logplain -rw-r--r--drm_modeset_helper_vtables.h41180logplain -rw-r--r--drm_modeset_lock.h4241logplain -rw-r--r--drm_of.h2034logplain -rw-r--r--drm_os_linux.h2230logplain -rw-r--r--drm_panel.h7079logplain -rw-r--r--drm_pciids.h68035logplain -rw-r--r--drm_plane.h19435logplain -rw-r--r--drm_plane_helper.h3186logplain -rw-r--r--drm_print.h3232logplain -rw-r--r--drm_property.h11460logplain -rw-r--r--drm_rect.h5103logplain -rw-r--r--drm_simple_kms_helper.h4090logplain -rw-r--r--drm_sysfs.h300logplain -rw-r--r--drm_vma_manager.h7840logplain -rw-r--r--gma_drm.h1033logplain d---------i2c109logplain