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rtw_br_ext.c
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/******************************************************************************
*
* Copyright(c) 2007 - 2011 Realtek Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
*
******************************************************************************/
#define _RTW_BR_EXT_C_
#ifdef __KERNEL__
#include <linux/if_arp.h>
#include <linux/version.h>
#include <net/ip.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0))
#include <net/ipx.h>
#endif
#include <linux/atalk.h>
#include <linux/udp.h>
#include <linux/if_pppox.h>
#endif
#if 1 // rtw_wifi_driver
#include <drv_types.h>
#else // rtw_wifi_driver
#include "./8192cd_cfg.h"
#ifndef __KERNEL__
#include "./sys-support.h"
#endif
#include "./8192cd.h"
#include "./8192cd_headers.h"
#include "./8192cd_br_ext.h"
#include "./8192cd_debug.h"
#endif // rtw_wifi_driver
#ifdef CL_IPV6_PASS
#ifdef __KERNEL__
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <net/ndisc.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24))
#include <net/ip6_checksum.h>
#else
#include <net/checksum.h>
#endif
#endif
#endif
#ifdef CONFIG_BR_EXT
//#define BR_EXT_DEBUG
#define NAT25_IPV4 01
#define NAT25_IPV6 02
#define NAT25_IPX 03
#define NAT25_APPLE 04
#define NAT25_PPPOE 05
#define RTL_RELAY_TAG_LEN (ETH_ALEN)
#define TAG_HDR_LEN 4
#define MAGIC_CODE 0x8186
#define MAGIC_CODE_LEN 2
#define WAIT_TIME_PPPOE 5 // waiting time for pppoe server in sec
/*-----------------------------------------------------------------
How database records network address:
0 1 2 3 4 5 6 7 8 9 10
|----|----|----|----|----|----|----|----|----|----|----|
IPv4 |type| | IP addr |
IPX |type| Net addr | Node addr |
IPX |type| Net addr |Sckt addr|
Apple |type| Network |node|
PPPoE |type| SID | AC MAC |
-----------------------------------------------------------------*/
//Find a tag in pppoe frame and return the pointer
static __inline__ unsigned char *__nat25_find_pppoe_tag(struct pppoe_hdr *ph, unsigned short type)
{
unsigned char *cur_ptr, *start_ptr;
unsigned short tagLen, tagType;
start_ptr = cur_ptr = (unsigned char *)ph->tag;
while((cur_ptr - start_ptr) < ntohs(ph->length)) {
// prevent un-alignment access
tagType = (unsigned short)((cur_ptr[0] << 8) + cur_ptr[1]);
tagLen = (unsigned short)((cur_ptr[2] << 8) + cur_ptr[3]);
if(tagType == type)
return cur_ptr;
cur_ptr = cur_ptr + TAG_HDR_LEN + tagLen;
}
return 0;
}
static __inline__ int __nat25_add_pppoe_tag(struct sk_buff *skb, struct pppoe_tag *tag)
{
struct pppoe_hdr *ph = (struct pppoe_hdr *)(skb->data + ETH_HLEN);
int data_len;
data_len = tag->tag_len + TAG_HDR_LEN;
if (skb_tailroom(skb) < data_len) {
_DEBUG_ERR("skb_tailroom() failed in add SID tag!\n");
return -1;
}
skb_put(skb, data_len);
// have a room for new tag
memmove(((unsigned char *)ph->tag + data_len), (unsigned char *)ph->tag, ntohs(ph->length));
ph->length = htons(ntohs(ph->length) + data_len);
memcpy((unsigned char *)ph->tag, tag, data_len);
return data_len;
}
static int skb_pull_and_merge(struct sk_buff *skb, unsigned char *src, int len)
{
int tail_len;
unsigned long end, tail;
if ((src+len) > skb_tail_pointer(skb) || skb->len < len)
return -1;
tail = (unsigned long)skb_tail_pointer(skb);
end = (unsigned long)src+len;
if (tail < end)
return -1;
tail_len = (int)(tail-end);
if (tail_len > 0)
memmove(src, src+len, tail_len);
skb_trim(skb, skb->len-len);
return 0;
}
static __inline__ unsigned long __nat25_timeout(_adapter *priv)
{
unsigned long timeout;
timeout = jiffies - NAT25_AGEING_TIME*HZ;
return timeout;
}
static __inline__ int __nat25_has_expired(_adapter *priv,
struct nat25_network_db_entry *fdb)
{
if(time_before_eq(fdb->ageing_timer, __nat25_timeout(priv)))
return 1;
return 0;
}
static __inline__ void __nat25_generate_ipv4_network_addr(unsigned char *networkAddr,
unsigned int *ipAddr)
{
memset(networkAddr, 0, MAX_NETWORK_ADDR_LEN);
networkAddr[0] = NAT25_IPV4;
memcpy(networkAddr+7, (unsigned char *)ipAddr, 4);
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0))
static __inline__ void __nat25_generate_ipx_network_addr_with_node(unsigned char *networkAddr,
unsigned int *ipxNetAddr, unsigned char *ipxNodeAddr)
{
memset(networkAddr, 0, MAX_NETWORK_ADDR_LEN);
networkAddr[0] = NAT25_IPX;
memcpy(networkAddr+1, (unsigned char *)ipxNetAddr, 4);
memcpy(networkAddr+5, ipxNodeAddr, 6);
}
static __inline__ void __nat25_generate_ipx_network_addr_with_socket(unsigned char *networkAddr,
unsigned int *ipxNetAddr, unsigned short *ipxSocketAddr)
{
memset(networkAddr, 0, MAX_NETWORK_ADDR_LEN);
networkAddr[0] = NAT25_IPX;
memcpy(networkAddr+1, (unsigned char *)ipxNetAddr, 4);
memcpy(networkAddr+5, (unsigned char *)ipxSocketAddr, 2);
}
#endif
static __inline__ void __nat25_generate_apple_network_addr(unsigned char *networkAddr,
unsigned short *network, unsigned char *node)
{
memset(networkAddr, 0, MAX_NETWORK_ADDR_LEN);
networkAddr[0] = NAT25_APPLE;
memcpy(networkAddr+1, (unsigned char *)network, 2);
networkAddr[3] = *node;
}
static __inline__ void __nat25_generate_pppoe_network_addr(unsigned char *networkAddr,
unsigned char *ac_mac, unsigned short *sid)
{
memset(networkAddr, 0, MAX_NETWORK_ADDR_LEN);
networkAddr[0] = NAT25_PPPOE;
memcpy(networkAddr+1, (unsigned char *)sid, 2);
memcpy(networkAddr+3, (unsigned char *)ac_mac, 6);
}
#ifdef CL_IPV6_PASS
static void __nat25_generate_ipv6_network_addr(unsigned char *networkAddr,
unsigned int *ipAddr)
{
memset(networkAddr, 0, MAX_NETWORK_ADDR_LEN);
networkAddr[0] = NAT25_IPV6;
memcpy(networkAddr+1, (unsigned char *)ipAddr, 16);
}
static unsigned char *scan_tlv(unsigned char *data, int len, unsigned char tag, unsigned char len8b)
{
while (len > 0) {
if (*data == tag && *(data+1) == len8b && len >= len8b*8)
return data+2;
len -= (*(data+1))*8;
data += (*(data+1))*8;
}
return NULL;
}
static int update_nd_link_layer_addr(unsigned char *data, int len, unsigned char *replace_mac)
{
struct icmp6hdr *icmphdr = (struct icmp6hdr *)data;
unsigned char *mac;
if (icmphdr->icmp6_type == NDISC_ROUTER_SOLICITATION) {
if (len >= 8) {
mac = scan_tlv(&data[8], len-8, 1, 1);
if (mac) {
DBG_871X("Router Solicitation, replace MAC From: %02x:%02x:%02x:%02x:%02x:%02x, To: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0],mac[1],mac[2],mac[3],mac[4],mac[5],
replace_mac[0],replace_mac[1],replace_mac[2],replace_mac[3],replace_mac[4],replace_mac[5]);
memcpy(mac, replace_mac, 6);
return 1;
}
}
}
else if (icmphdr->icmp6_type == NDISC_ROUTER_ADVERTISEMENT) {
if (len >= 16) {
mac = scan_tlv(&data[16], len-16, 1, 1);
if (mac) {
DBG_871X("Router Advertisement, replace MAC From: %02x:%02x:%02x:%02x:%02x:%02x, To: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0],mac[1],mac[2],mac[3],mac[4],mac[5],
replace_mac[0],replace_mac[1],replace_mac[2],replace_mac[3],replace_mac[4],replace_mac[5]);
memcpy(mac, replace_mac, 6);
return 1;
}
}
}
else if (icmphdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
if (len >= 24) {
mac = scan_tlv(&data[24], len-24, 1, 1);
if (mac) {
DBG_871X("Neighbor Solicitation, replace MAC From: %02x:%02x:%02x:%02x:%02x:%02x, To: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0],mac[1],mac[2],mac[3],mac[4],mac[5],
replace_mac[0],replace_mac[1],replace_mac[2],replace_mac[3],replace_mac[4],replace_mac[5]);
memcpy(mac, replace_mac, 6);
return 1;
}
}
}
else if (icmphdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
if (len >= 24) {
mac = scan_tlv(&data[24], len-24, 2, 1);
if (mac) {
DBG_871X("Neighbor Advertisement, replace MAC From: %02x:%02x:%02x:%02x:%02x:%02x, To: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0],mac[1],mac[2],mac[3],mac[4],mac[5],
replace_mac[0],replace_mac[1],replace_mac[2],replace_mac[3],replace_mac[4],replace_mac[5]);
memcpy(mac, replace_mac, 6);
return 1;
}
}
}
else if (icmphdr->icmp6_type == NDISC_REDIRECT) {
if (len >= 40) {
mac = scan_tlv(&data[40], len-40, 2, 1);
if (mac) {
DBG_871X("Redirect, replace MAC From: %02x:%02x:%02x:%02x:%02x:%02x, To: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0],mac[1],mac[2],mac[3],mac[4],mac[5],
replace_mac[0],replace_mac[1],replace_mac[2],replace_mac[3],replace_mac[4],replace_mac[5]);
memcpy(mac, replace_mac, 6);
return 1;
}
}
}
return 0;
}
static void convert_ipv6_mac_to_mc(struct sk_buff *skb)
{
struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + ETH_HLEN);
unsigned char *dst_mac = skb->data;
//dst_mac[0] = 0xff;
//dst_mac[1] = 0xff;
/*modified by qinjunjie,ipv6 multicast address ix 0x33-33-xx-xx-xx-xx*/
dst_mac[0] = 0x33;
dst_mac[1] = 0x33;
memcpy(&dst_mac[2], &iph->daddr.s6_addr32[3], 4);
#if defined(__LINUX_2_6__)
/*modified by qinjunjie,warning:should not remove next line*/
skb->pkt_type = PACKET_MULTICAST;
#endif
}
#endif /* CL_IPV6_PASS */
static __inline__ int __nat25_network_hash(unsigned char *networkAddr)
{
if(networkAddr[0] == NAT25_IPV4)
{
unsigned long x;
x = networkAddr[7] ^ networkAddr[8] ^ networkAddr[9] ^ networkAddr[10];
return x & (NAT25_HASH_SIZE - 1);
}
else if(networkAddr[0] == NAT25_IPX)
{
unsigned long x;
x = networkAddr[1] ^ networkAddr[2] ^ networkAddr[3] ^ networkAddr[4] ^ networkAddr[5] ^
networkAddr[6] ^ networkAddr[7] ^ networkAddr[8] ^ networkAddr[9] ^ networkAddr[10];
return x & (NAT25_HASH_SIZE - 1);
}
else if(networkAddr[0] == NAT25_APPLE)
{
unsigned long x;
x = networkAddr[1] ^ networkAddr[2] ^ networkAddr[3];
return x & (NAT25_HASH_SIZE - 1);
}
else if(networkAddr[0] == NAT25_PPPOE)
{
unsigned long x;
x = networkAddr[0] ^ networkAddr[1] ^ networkAddr[2] ^ networkAddr[3] ^ networkAddr[4] ^ networkAddr[5] ^ networkAddr[6] ^ networkAddr[7] ^ networkAddr[8];
return x & (NAT25_HASH_SIZE - 1);
}
#ifdef CL_IPV6_PASS
else if(networkAddr[0] == NAT25_IPV6)
{
unsigned long x;
x = networkAddr[1] ^ networkAddr[2] ^ networkAddr[3] ^ networkAddr[4] ^ networkAddr[5] ^
networkAddr[6] ^ networkAddr[7] ^ networkAddr[8] ^ networkAddr[9] ^ networkAddr[10] ^
networkAddr[11] ^ networkAddr[12] ^ networkAddr[13] ^ networkAddr[14] ^ networkAddr[15] ^
networkAddr[16];
return x & (NAT25_HASH_SIZE - 1);
}
#endif
else
{
unsigned long x = 0;
int i;
for (i=0; i<MAX_NETWORK_ADDR_LEN; i++)
x ^= networkAddr[i];
return x & (NAT25_HASH_SIZE - 1);
}
}
static __inline__ void __network_hash_link(_adapter *priv,
struct nat25_network_db_entry *ent, int hash)
{
// Caller must _enter_critical_bh already!
//_irqL irqL;
//_enter_critical_bh(&priv->br_ext_lock, &irqL);
ent->next_hash = priv->nethash[hash];
if(ent->next_hash != NULL)
ent->next_hash->pprev_hash = &ent->next_hash;
priv->nethash[hash] = ent;
ent->pprev_hash = &priv->nethash[hash];
//_exit_critical_bh(&priv->br_ext_lock, &irqL);
}
static __inline__ void __network_hash_unlink(struct nat25_network_db_entry *ent)
{
// Caller must _enter_critical_bh already!
//_irqL irqL;
//_enter_critical_bh(&priv->br_ext_lock, &irqL);
*(ent->pprev_hash) = ent->next_hash;
if(ent->next_hash != NULL)
ent->next_hash->pprev_hash = ent->pprev_hash;
ent->next_hash = NULL;
ent->pprev_hash = NULL;
//_exit_critical_bh(&priv->br_ext_lock, &irqL);
}
static int __nat25_db_network_lookup_and_replace(_adapter *priv,
struct sk_buff *skb, unsigned char *networkAddr)
{
struct nat25_network_db_entry *db;
_irqL irqL;
_enter_critical_bh(&priv->br_ext_lock, &irqL);
db = priv->nethash[__nat25_network_hash(networkAddr)];
while (db != NULL)
{
if(!memcmp(db->networkAddr, networkAddr, MAX_NETWORK_ADDR_LEN))
{
if(!__nat25_has_expired(priv, db))
{
// replace the destination mac address
memcpy(skb->data, db->macAddr, ETH_ALEN);
atomic_inc(&db->use_count);
#ifdef CL_IPV6_PASS
DBG_871X("NAT25: Lookup M:%02x%02x%02x%02x%02x%02x N:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x\n",
db->macAddr[0],
db->macAddr[1],
db->macAddr[2],
db->macAddr[3],
db->macAddr[4],
db->macAddr[5],
db->networkAddr[0],
db->networkAddr[1],
db->networkAddr[2],
db->networkAddr[3],
db->networkAddr[4],
db->networkAddr[5],
db->networkAddr[6],
db->networkAddr[7],
db->networkAddr[8],
db->networkAddr[9],
db->networkAddr[10],
db->networkAddr[11],
db->networkAddr[12],
db->networkAddr[13],
db->networkAddr[14],
db->networkAddr[15],
db->networkAddr[16]);
#else
DBG_871X("NAT25: Lookup M:%02x%02x%02x%02x%02x%02x N:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
db->macAddr[0],
db->macAddr[1],
db->macAddr[2],
db->macAddr[3],
db->macAddr[4],
db->macAddr[5],
db->networkAddr[0],
db->networkAddr[1],
db->networkAddr[2],
db->networkAddr[3],
db->networkAddr[4],
db->networkAddr[5],
db->networkAddr[6],
db->networkAddr[7],
db->networkAddr[8],
db->networkAddr[9],
db->networkAddr[10]);
#endif
}
_exit_critical_bh(&priv->br_ext_lock, &irqL);
return 1;
}
db = db->next_hash;
}
_exit_critical_bh(&priv->br_ext_lock, &irqL);
return 0;
}
static void __nat25_db_network_insert(_adapter *priv,
unsigned char *macAddr, unsigned char *networkAddr)
{
struct nat25_network_db_entry *db;
int hash;
_irqL irqL;
_enter_critical_bh(&priv->br_ext_lock, &irqL);
hash = __nat25_network_hash(networkAddr);
db = priv->nethash[hash];
while (db != NULL)
{
if(!memcmp(db->networkAddr, networkAddr, MAX_NETWORK_ADDR_LEN))
{
memcpy(db->macAddr, macAddr, ETH_ALEN);
db->ageing_timer = jiffies;
_exit_critical_bh(&priv->br_ext_lock, &irqL);
return;
}
db = db->next_hash;
}
db = (struct nat25_network_db_entry *) rtw_malloc(sizeof(*db));
if(db == NULL) {
_exit_critical_bh(&priv->br_ext_lock, &irqL);
return;
}
memcpy(db->networkAddr, networkAddr, MAX_NETWORK_ADDR_LEN);
memcpy(db->macAddr, macAddr, ETH_ALEN);
atomic_set(&db->use_count, 1);
db->ageing_timer = jiffies;
__network_hash_link(priv, db, hash);
_exit_critical_bh(&priv->br_ext_lock, &irqL);
}
static void __nat25_db_print(_adapter *priv)
{
_irqL irqL;
_enter_critical_bh(&priv->br_ext_lock, &irqL);
#ifdef BR_EXT_DEBUG
static int counter = 0;
int i, j;
struct nat25_network_db_entry *db;
counter++;
if((counter % 16) != 0)
return;
for(i=0, j=0; i<NAT25_HASH_SIZE; i++)
{
db = priv->nethash[i];
while (db != NULL)
{
#ifdef CL_IPV6_PASS
panic_printk("NAT25: DB(%d) H(%02d) C(%d) M:%02x%02x%02x%02x%02x%02x N:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x\n",
j,
i,
atomic_read(&db->use_count),
db->macAddr[0],
db->macAddr[1],
db->macAddr[2],
db->macAddr[3],
db->macAddr[4],
db->macAddr[5],
db->networkAddr[0],
db->networkAddr[1],
db->networkAddr[2],
db->networkAddr[3],
db->networkAddr[4],
db->networkAddr[5],
db->networkAddr[6],
db->networkAddr[7],
db->networkAddr[8],
db->networkAddr[9],
db->networkAddr[10],
db->networkAddr[11],
db->networkAddr[12],
db->networkAddr[13],
db->networkAddr[14],
db->networkAddr[15],
db->networkAddr[16]);
#else
panic_printk("NAT25: DB(%d) H(%02d) C(%d) M:%02x%02x%02x%02x%02x%02x N:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
j,
i,
atomic_read(&db->use_count),
db->macAddr[0],
db->macAddr[1],
db->macAddr[2],
db->macAddr[3],
db->macAddr[4],
db->macAddr[5],
db->networkAddr[0],
db->networkAddr[1],
db->networkAddr[2],
db->networkAddr[3],
db->networkAddr[4],
db->networkAddr[5],
db->networkAddr[6],
db->networkAddr[7],
db->networkAddr[8],
db->networkAddr[9],
db->networkAddr[10]);
#endif
j++;
db = db->next_hash;
}
}
#endif
_exit_critical_bh(&priv->br_ext_lock, &irqL);
}
/*
* NAT2.5 interface
*/
void nat25_db_cleanup(_adapter *priv)
{
int i;
_irqL irqL;
_enter_critical_bh(&priv->br_ext_lock, &irqL);
for(i=0; i<NAT25_HASH_SIZE; i++)
{
struct nat25_network_db_entry *f;
f = priv->nethash[i];
while (f != NULL) {
struct nat25_network_db_entry *g;
g = f->next_hash;
if(priv->scdb_entry == f)
{
memset(priv->scdb_mac, 0, ETH_ALEN);
memset(priv->scdb_ip, 0, 4);
priv->scdb_entry = NULL;
}
__network_hash_unlink(f);
rtw_mfree((u8 *) f, sizeof(struct nat25_network_db_entry));
f = g;
}
}
_exit_critical_bh(&priv->br_ext_lock, &irqL);
}
void nat25_db_expire(_adapter *priv)
{
int i;
_irqL irqL;
_enter_critical_bh(&priv->br_ext_lock, &irqL);
//if(!priv->ethBrExtInfo.nat25_disable)
{
for (i=0; i<NAT25_HASH_SIZE; i++)
{
struct nat25_network_db_entry *f;
f = priv->nethash[i];
while (f != NULL)
{
struct nat25_network_db_entry *g;
g = f->next_hash;
if(__nat25_has_expired(priv, f))
{
if(atomic_dec_and_test(&f->use_count))
{
#ifdef BR_EXT_DEBUG
#ifdef CL_IPV6_PASS
panic_printk("NAT25 Expire H(%02d) M:%02x%02x%02x%02x%02x%02x N:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x\n",
i,
f->macAddr[0],
f->macAddr[1],
f->macAddr[2],
f->macAddr[3],
f->macAddr[4],
f->macAddr[5],
f->networkAddr[0],
f->networkAddr[1],
f->networkAddr[2],
f->networkAddr[3],
f->networkAddr[4],
f->networkAddr[5],
f->networkAddr[6],
f->networkAddr[7],
f->networkAddr[8],
f->networkAddr[9],
f->networkAddr[10],
f->networkAddr[11],
f->networkAddr[12],
f->networkAddr[13],
f->networkAddr[14],
f->networkAddr[15],
f->networkAddr[16]);
#else
panic_printk("NAT25 Expire H(%02d) M:%02x%02x%02x%02x%02x%02x N:%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
i,
f->macAddr[0],
f->macAddr[1],
f->macAddr[2],
f->macAddr[3],
f->macAddr[4],
f->macAddr[5],
f->networkAddr[0],
f->networkAddr[1],
f->networkAddr[2],
f->networkAddr[3],
f->networkAddr[4],
f->networkAddr[5],
f->networkAddr[6],
f->networkAddr[7],
f->networkAddr[8],
f->networkAddr[9],
f->networkAddr[10]);
#endif
#endif
if(priv->scdb_entry == f)
{
memset(priv->scdb_mac, 0, ETH_ALEN);
memset(priv->scdb_ip, 0, 4);
priv->scdb_entry = NULL;
}
__network_hash_unlink(f);
rtw_mfree((u8 *) f, sizeof(struct nat25_network_db_entry));
}
}
f = g;
}
}
}
_exit_critical_bh(&priv->br_ext_lock, &irqL);
}
#ifdef SUPPORT_TX_MCAST2UNI
static int checkIPMcAndReplace(_adapter *priv, struct sk_buff *skb, unsigned int *dst_ip)
{
struct stat_info *pstat;
struct list_head *phead, *plist;
int i;
phead = &priv->asoc_list;
plist = phead->next;
while (plist != phead) {
pstat = list_entry(plist, struct stat_info, asoc_list);
plist = plist->next;
if (pstat->ipmc_num == 0)
continue;
for (i=0; i<MAX_IP_MC_ENTRY; i++) {
if (pstat->ipmc[i].used && !memcmp(&pstat->ipmc[i].mcmac[3], ((unsigned char *)dst_ip)+1, 3)) {
memcpy(skb->data, pstat->ipmc[i].mcmac, ETH_ALEN);
return 1;
}
}
}
return 0;
}
#endif
int nat25_db_handle(_adapter *priv, struct sk_buff *skb, int method)
{
unsigned short protocol;
unsigned char networkAddr[MAX_NETWORK_ADDR_LEN];
if(skb == NULL)
return -1;
if((method <= NAT25_MIN) || (method >= NAT25_MAX))
return -1;
protocol = *((unsigned short *)(skb->data + 2 * ETH_ALEN));
/*---------------------------------------------------*/
/* Handle IP frame */
/*---------------------------------------------------*/
if(protocol == __constant_htons(ETH_P_IP))
{
struct iphdr* iph = (struct iphdr *)(skb->data + ETH_HLEN);
if(((unsigned char*)(iph) + (iph->ihl<<2)) >= (skb->data + ETH_HLEN + skb->len))
{
DEBUG_WARN("NAT25: malformed IP packet !\n");
return -1;
}
switch(method)
{
case NAT25_CHECK:
return -1;
case NAT25_INSERT:
{
//some muticast with source IP is all zero, maybe other case is illegal
//in class A, B, C, host address is all zero or all one is illegal
if (iph->saddr == 0)
return 0;
DBG_871X("NAT25: Insert IP, SA=%08x, DA=%08x\n", iph->saddr, iph->daddr);
__nat25_generate_ipv4_network_addr(networkAddr, &iph->saddr);
//record source IP address and , source mac address into db
__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
__nat25_db_print(priv);
}
return 0;
case NAT25_LOOKUP:
{
DBG_871X("NAT25: Lookup IP, SA=%08x, DA=%08x\n", iph->saddr, iph->daddr);
#ifdef SUPPORT_TX_MCAST2UNI
if (priv->pshare->rf_ft_var.mc2u_disable ||
((((OPMODE & (WIFI_STATION_STATE|WIFI_ASOC_STATE))
== (WIFI_STATION_STATE|WIFI_ASOC_STATE)) &&
!checkIPMcAndReplace(priv, skb, &iph->daddr)) ||
(OPMODE & WIFI_ADHOC_STATE)))
#endif
{
__nat25_generate_ipv4_network_addr(networkAddr, &iph->daddr);
if (!__nat25_db_network_lookup_and_replace(priv, skb, networkAddr)) {
if (*((unsigned char *)&iph->daddr + 3) == 0xff) {
// L2 is unicast but L3 is broadcast, make L2 bacome broadcast
DBG_871X("NAT25: Set DA as boardcast\n");
memset(skb->data, 0xff, ETH_ALEN);
}
else {
// forward unknow IP packet to upper TCP/IP
DBG_871X("NAT25: Replace DA with BR's MAC\n");
if ( (*(u32 *)priv->br_mac) == 0 && (*(u16 *)(priv->br_mac+4)) == 0 ) {
void netdev_br_init(struct net_device *netdev);
printk("Re-init netdev_br_init() due to br_mac==0!\n");
netdev_br_init(priv->pnetdev);
}
memcpy(skb->data, priv->br_mac, ETH_ALEN);
}
}
}
}
return 0;
default:
return -1;
}
}
/*---------------------------------------------------*/
/* Handle ARP frame */
/*---------------------------------------------------*/
else if(protocol == __constant_htons(ETH_P_ARP))
{
struct arphdr *arp = (struct arphdr *)(skb->data + ETH_HLEN);
unsigned char *arp_ptr = (unsigned char *)(arp + 1);
unsigned int *sender, *target;
if(arp->ar_pro != __constant_htons(ETH_P_IP))
{
DEBUG_WARN("NAT25: arp protocol unknown (%4x)!\n", htons(arp->ar_pro));
return -1;
}
switch(method)
{
case NAT25_CHECK:
return 0; // skb_copy for all ARP frame
case NAT25_INSERT:
{
DBG_871X("NAT25: Insert ARP, MAC=%02x%02x%02x%02x%02x%02x\n", arp_ptr[0],
arp_ptr[1], arp_ptr[2], arp_ptr[3], arp_ptr[4], arp_ptr[5]);
// change to ARP sender mac address to wlan STA address
memcpy(arp_ptr, GET_MY_HWADDR(priv), ETH_ALEN);
arp_ptr += arp->ar_hln;
sender = (unsigned int *)arp_ptr;
__nat25_generate_ipv4_network_addr(networkAddr, sender);
__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
__nat25_db_print(priv);
}
return 0;
case NAT25_LOOKUP:
{
DBG_871X("NAT25: Lookup ARP\n");
arp_ptr += arp->ar_hln;
sender = (unsigned int *)arp_ptr;
arp_ptr += (arp->ar_hln + arp->ar_pln);
target = (unsigned int *)arp_ptr;
__nat25_generate_ipv4_network_addr(networkAddr, target);
__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
// change to ARP target mac address to Lookup result
arp_ptr = (unsigned char *)(arp + 1);
arp_ptr += (arp->ar_hln + arp->ar_pln);
memcpy(arp_ptr, skb->data, ETH_ALEN);
}
return 0;
default:
return -1;
}
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0))
/*---------------------------------------------------*/
/* Handle IPX and Apple Talk frame */
/*---------------------------------------------------*/
else if((protocol == __constant_htons(ETH_P_IPX)) ||
(protocol == __constant_htons(ETH_P_ATALK)) ||
(protocol == __constant_htons(ETH_P_AARP)))
{
unsigned char ipx_header[2] = {0xFF, 0xFF};
struct ipxhdr *ipx = NULL;
struct elapaarp *ea = NULL;
struct ddpehdr *ddp = NULL;
unsigned char *framePtr = skb->data + ETH_HLEN;
if(protocol == __constant_htons(ETH_P_IPX))
{
DBG_871X("NAT25: Protocol=IPX (Ethernet II)\n");
ipx = (struct ipxhdr *)framePtr;
}
else //if(protocol <= __constant_htons(ETH_FRAME_LEN))
{
if(!memcmp(ipx_header, framePtr, 2))
{
DBG_871X("NAT25: Protocol=IPX (Ethernet 802.3)\n");
ipx = (struct ipxhdr *)framePtr;
}
else
{
unsigned char ipx_8022_type = 0xE0;
unsigned char snap_8022_type = 0xAA;
if(*framePtr == snap_8022_type)
{
unsigned char ipx_snap_id[5] = {0x0, 0x0, 0x0, 0x81, 0x37}; // IPX SNAP ID
unsigned char aarp_snap_id[5] = {0x00, 0x00, 0x00, 0x80, 0xF3}; // Apple Talk AARP SNAP ID
unsigned char ddp_snap_id[5] = {0x08, 0x00, 0x07, 0x80, 0x9B}; // Apple Talk DDP SNAP ID
framePtr += 3; // eliminate the 802.2 header
if(!memcmp(ipx_snap_id, framePtr, 5))
{
framePtr += 5; // eliminate the SNAP header
DBG_871X("NAT25: Protocol=IPX (Ethernet SNAP)\n");
ipx = (struct ipxhdr *)framePtr;
}
else if(!memcmp(aarp_snap_id, framePtr, 5))
{
framePtr += 5; // eliminate the SNAP header
ea = (struct elapaarp *)framePtr;
}
else if(!memcmp(ddp_snap_id, framePtr, 5))
{
framePtr += 5; // eliminate the SNAP header
ddp = (struct ddpehdr *)framePtr;
}
else
{
DEBUG_WARN("NAT25: Protocol=Ethernet SNAP %02x%02x%02x%02x%02x\n", framePtr[0],
framePtr[1], framePtr[2], framePtr[3], framePtr[4]);
return -1;
}
}