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esp_utils.c
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/* Copyright (c) 2008 -2014 Espressif System.
*
* 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.
*
*/
#include "linux/types.h"
#include "linux/kernel.h"
#include <linux/ieee80211.h>
#include <net/mac80211.h>
#include <linux/skbuff.h>
#include <net/tcp.h>
#include <linux/ip.h>
#include <asm/checksum.h>
#include "esp_pub.h"
#include "esp_utils.h"
#include "esp_wmac.h"
#include "esp_debug.h"
/*
* Convert IEEE channel number to MHz frequency.
*/
u32 esp_ieee2mhz(u8 chan)
{
if (chan == 14)
return 2484;
if (chan < 14)
return 2407 + chan*5;
else
return 2512 + ((chan-15)*20);
//TODO, add 5GHz
}
enum {
ESP_RATE_1_LONG = 0x0,
ESP_RATE_2_LONG = 0x1,
ESP_RATE_2_SHORT = 0x5,
ESP_RATE_5_SHORT = 0x6,
ESP_RATE_5_LONG = 0x2,
ESP_RATE_11_SHORT = 0x7,
ESP_RATE_11_LONG = 0x3,
ESP_RATE_6 = 0xb,
ESP_RATE_9 = 0xf,
ESP_RATE_12 = 0xa,
ESP_RATE_18 = 0xe,
ESP_RATE_24 = 0x9,
ESP_RATE_36 = 0xd,
ESP_RATE_48 = 0x8,
ESP_RATE_54 = 0xc,
/* ESP_RATE_MCS0 =0x10,
ESP_RATE_MCS1 =0x11,
ESP_RATE_MCS2 =0x12,
ESP_RATE_MCS3 =0x13,
ESP_RATE_MCS4 =0x14,
ESP_RATE_MCS5 =0x15,
ESP_RATE_MCS6 =0x16,
ESP_RATE_MCS7 =0x17,
*/
};
static u8 esp_rate_table[20] = {
ESP_RATE_1_LONG,
ESP_RATE_2_SHORT,
ESP_RATE_5_SHORT,
ESP_RATE_11_SHORT,
ESP_RATE_6,
ESP_RATE_9,
ESP_RATE_12,
ESP_RATE_18,
ESP_RATE_24,
ESP_RATE_36,
ESP_RATE_48,
ESP_RATE_54,
/* ESP_RATE_MCS0,
ESP_RATE_MCS1,
ESP_RATE_MCS2,
ESP_RATE_MCS3,
ESP_RATE_MCS4,
ESP_RATE_MCS5,
ESP_RATE_MCS6,
ESP_RATE_MCS7,
*/
};
s8 esp_wmac_rate2idx(u8 rate)
{
int i;
if (rate == ESP_RATE_2_LONG)
return 1;
if (rate == ESP_RATE_5_LONG)
return 2;
if (rate == ESP_RATE_11_LONG)
return 3;
for (i = 0; i < 20; i++) {
if (rate == esp_rate_table[i])
return i;
}
esp_dbg(ESP_DBG_ERROR,"%s unknown rate 0x%02x \n", __func__, rate);
return 0;
}
bool esp_wmac_rxsec_error(u8 error)
{
return (error >= RX_SECOV_ERR && error <= RX_SECFIFO_TIMEOUT) || (error >= RX_WEPICV_ERR && error <= RX_WAPIMIC_ERR);
}
int esp_cipher2alg(int cipher)
{
if (cipher == WLAN_CIPHER_SUITE_TKIP)
return ALG_TKIP;
if (cipher == WLAN_CIPHER_SUITE_CCMP)
return ALG_CCMP;
if (cipher == WLAN_CIPHER_SUITE_WEP40 || cipher == WLAN_CIPHER_SUITE_WEP104)
return ALG_WEP;
if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
return ALG_AES_CMAC;
//printk("%s wrong cipher 0x%x!\n",__func__,cipher);
return -1;
}
#ifdef RX_CHECKSUM_TEST
atomic_t g_iv_len;
void esp_rx_checksum_test(struct sk_buff *skb)
{
static u32 ip_err = 0;
static u32 tcp_err = 0;
struct ieee80211_hdr *pwh = (struct ieee80211_hdr *)skb->data;
int hdrlen = ieee80211_hdrlen(pwh->frame_control);
if(ieee80211_has_protected(pwh->frame_control))
hdrlen += atomic_read(&g_iv_len);
if (ieee80211_is_data(pwh->frame_control)) {
struct llc_snap_hdr * llc = (struct llc_snap_hdr *)(skb->data + hdrlen);
if (ntohs(llc->eth_type) == ETH_P_IP) {
int llclen = sizeof(struct llc_snap_hdr);
struct iphdr *iph = (struct iphdr *)(skb->data + hdrlen + llclen);
__sum16 csum_bak = iph->check;
iph->check = 0;
iph->check = ip_fast_csum(iph, iph->ihl);
if (iph->check != csum_bak) {
esp_dbg(ESP_DBG_ERROR, "total ip checksum error %d\n", ++ip_err);
}
iph->check = csum_bak;
if (iph->protocol == 0x06) {
struct tcphdr *tcph = (struct tcphdr *)(skb->data + hdrlen + llclen + iph->ihl * 4);
int datalen = skb->len - (hdrlen + llclen + iph->ihl * 4);
csum_bak = tcph->check;
tcph->check = 0;
tcph->check = tcp_v4_check(datalen, iph->saddr, iph->daddr, csum_partial((char *)tcph, datalen, 0));
if (tcph->check != csum_bak)
{
esp_dbg(ESP_DBG_ERROR, "total tcp checksum error %d\n", ++tcp_err);
}
tcph->check = csum_bak;
}
}
}
}
#endif
#ifdef GEN_ERR_CHECKSUM
void esp_gen_err_checksum(struct sk_buff *skb)
{
static u32 tx_seq = 0;
if ((tx_seq++ % 16) == 0)
{
struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data;
int hdrlen = ieee80211_hdrlen(hdr->frame_control);
if(ieee80211_has_protected(pwh->frame_control))
hdrlen += IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
struct llc_snap_hdr * llc = (struct llc_snap_hdr *)(skb->data + hdrlen);
if (ntohs(llc->eth_type) == ETH_P_IP) {
int llclen = sizeof(struct llc_snap_hdr);
struct iphdr *iph = (struct iphdr *)(skb->data + hdrlen + llclen);
iph->check = ~iph->check;
if (iph->protocol == 0x06) {
struct tcphdr *tcph = (struct tcphdr *)(skb->data + hdrlen + llclen + iph->ihl * 4);
tcph->check = ~tcph->check;
}
}
}
}
#endif
bool esp_is_ip_pkt(struct sk_buff *skb)
{
struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data;
int hdrlen;
struct llc_snap_hdr * llc;
if (!ieee80211_is_data(hdr->frame_control))
return false;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if(ieee80211_has_protected(hdr->frame_control))
hdrlen += IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
#ifdef RX_CHECKSUM_TEST
atomic_set(&g_iv_len, IEEE80211_SKB_CB(skb)->control.hw_key->iv_len);
#endif
if(skb->len < hdrlen + sizeof(struct llc_snap_hdr))
return false;
llc = (struct llc_snap_hdr *)(skb->data + hdrlen);
if (ntohs(llc->eth_type) != ETH_P_IP)
return false;
else
return true;
}