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rtl8188eu/core/rtw_br_ext.c
Larry Finger 993b4435cb rtl8188eu: Fix most errors from smatch 
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
2015-03-10 11:18:03 -05:00

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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 <net/ip.h>
#include <net/ipx.h>
#include <linux/atalk.h>
#include <linux/udp.h>
#include <linux/if_pppox.h>
#include <net/ip6_checksum.h>
#endif
#include <drv_conf.h>
#include <drv_types.h>
#include "rtw_br_ext.h"
#include <usb_osintf.h>
#ifdef CL_IPV6_PASS
#ifdef __KERNEL__
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <net/ndisc.h>
#include <net/checksum.h>
#endif
#endif
#ifdef CONFIG_BR_EXT
#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 NULL;
}
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 = be16_to_cpu(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(struct adapter *priv)
{
unsigned long timeout;
timeout = jiffies - NAT25_AGEING_TIME*HZ;
return timeout;
}
static __inline__ int __nat25_has_expired(struct 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);
}
static __inline__ void __nat25_generate_ipx_network_addr_with_node(unsigned char *networkAddr,
__be32 *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,
__be32 *ipxNetAddr, __be16 *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);
}
static __inline__ void __nat25_generate_apple_network_addr(unsigned char *networkAddr,
__be16 *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, __be16 *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) {
_DEBUG_INFO("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) {
_DEBUG_INFO("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) {
_DEBUG_INFO("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) {
_DEBUG_INFO("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) {
_DEBUG_INFO("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(struct adapter *priv,
struct nat25_network_db_entry *ent, int hash)
{
/* Caller must spin_lock_bh already! */
/* _irqL irqL; */
/* spin_lock_bh(&priv->br_ext_lock); */
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];
/* spin_unlock_bh(&priv->br_ext_lock); */
}
static __inline__ void __network_hash_unlink(struct nat25_network_db_entry *ent)
{
/* Caller must spin_lock_bh already! */
/* _irqL irqL; */
/* spin_lock_bh(&priv->br_ext_lock); */
*(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;
/* spin_unlock_bh(&priv->br_ext_lock); */
}
static int __nat25_db_network_lookup_and_replace(struct adapter *priv,
struct sk_buff *skb, unsigned char *networkAddr)
{
struct nat25_network_db_entry *db;
_irqL irqL;
spin_lock_bh(&priv->br_ext_lock);
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
DEBUG_INFO("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
DEBUG_INFO("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
}
spin_unlock_bh(&priv->br_ext_lock);
return 1;
}
db = db->next_hash;
}
spin_unlock_bh(&priv->br_ext_lock);
return 0;
}
static void __nat25_db_network_insert(struct adapter *priv,
unsigned char *macAddr, unsigned char *networkAddr)
{
struct nat25_network_db_entry *db;
int hash;
_irqL irqL;
spin_lock_bh(&priv->br_ext_lock);
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;
spin_unlock_bh(&priv->br_ext_lock);
return;
}
db = db->next_hash;
}
db = (struct nat25_network_db_entry *) rtw_malloc(sizeof(*db));
if(db == NULL) {
spin_unlock_bh(&priv->br_ext_lock);
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);
spin_unlock_bh(&priv->br_ext_lock);
}
static void __nat25_db_print(struct adapter *priv)
{
}
/*
* NAT2.5 interface
*/
void nat25_db_cleanup(struct adapter *priv)
{
int i;
_irqL irqL;
spin_lock_bh(&priv->br_ext_lock);
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;
}
}
spin_unlock_bh(&priv->br_ext_lock);
}
void nat25_db_expire(struct adapter *priv)
{
int i;
_irqL irqL;
spin_lock_bh(&priv->br_ext_lock);
/* 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))
{
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;
}
}
}
spin_unlock_bh(&priv->br_ext_lock);
}
#ifdef SUPPORT_TX_MCAST2UNI
static int checkIPMcAndReplace(struct 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(struct adapter *priv, struct sk_buff *skb, int method)
{
unsigned short protocol;
unsigned char networkAddr[MAX_NETWORK_ADDR_LEN];
u32 tmp;
if(skb == NULL)
return -1;
if((method <= NAT25_MIN) || (method >= NAT25_MAX))
return -1;
protocol = be16_to_cpu(*((__be16 *)(skb->data + 2 * ETH_ALEN)));
/*---------------------------------------------------*/
/* Handle IP frame */
/*---------------------------------------------------*/
if(protocol == 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:
{
tmp = be32_to_cpu(iph->saddr);
/* 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;
DEBUG_INFO("NAT25: Insert IP, SA=%08x, DA=%08x\n", iph->saddr, iph->daddr);
__nat25_generate_ipv4_network_addr(networkAddr, &tmp);
/* 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:
{
DEBUG_INFO("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
{
tmp = be32_to_cpu(iph->daddr);
__nat25_generate_ipv4_network_addr(networkAddr, &tmp);
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 */
DEBUG_INFO("NAT25: Set DA as boardcast\n");
memset(skb->data, 0xff, ETH_ALEN);
} else {
/* forward unknow IP packet to upper TCP/IP */
DEBUG_INFO("NAT25: Replace DA with BR's MAC\n");
if ( (*(u32 *)priv->br_mac) == 0 && (*(u16 *)(priv->br_mac+4)) == 0 ) {
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 == 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:
{
DEBUG_INFO("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:
{
DEBUG_INFO("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;
}
}
/*---------------------------------------------------*/
/* Handle IPX and Apple Talk frame */
/*---------------------------------------------------*/
else if((protocol == ETH_P_IPX) ||
(protocol <= ETH_FRAME_LEN))
{
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 == ETH_P_IPX)
{
DEBUG_INFO("NAT25: Protocol=IPX (Ethernet II)\n");
ipx = (struct ipxhdr *)framePtr;
}
else if(protocol <= ETH_FRAME_LEN)
{
if(!memcmp(ipx_header, framePtr, 2))
{
DEBUG_INFO("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 */
DEBUG_INFO("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;
}
}
else if(*framePtr == ipx_8022_type)
{
framePtr += 3; /* eliminate the 802.2 header */
if(!memcmp(ipx_header, framePtr, 2))
{
DEBUG_INFO("NAT25: Protocol=IPX (Ethernet 802.2)\n");
ipx = (struct ipxhdr *)framePtr;
}
else
return -1;
}
else
return -1;
}
}
else
return -1;
/* IPX */
if(ipx != NULL)
{
switch(method)
{
case NAT25_CHECK:
if(!memcmp(skb->data+ETH_ALEN, ipx->ipx_source.node, ETH_ALEN))
{
DEBUG_INFO("NAT25: Check IPX skb_copy\n");
return 0;
}
return -1;
case NAT25_INSERT:
{
DEBUG_INFO("NAT25: Insert IPX, Dest=%08x,%02x%02x%02x%02x%02x%02x,%04x Source=%08x,%02x%02x%02x%02x%02x%02x,%04x\n",
ipx->ipx_dest.net,
ipx->ipx_dest.node[0],
ipx->ipx_dest.node[1],
ipx->ipx_dest.node[2],
ipx->ipx_dest.node[3],
ipx->ipx_dest.node[4],
ipx->ipx_dest.node[5],
ipx->ipx_dest.sock,
ipx->ipx_source.net,
ipx->ipx_source.node[0],
ipx->ipx_source.node[1],
ipx->ipx_source.node[2],
ipx->ipx_source.node[3],
ipx->ipx_source.node[4],
ipx->ipx_source.node[5],
ipx->ipx_source.sock);
if(!memcmp(skb->data+ETH_ALEN, ipx->ipx_source.node, ETH_ALEN))
{
DEBUG_INFO("NAT25: Use IPX Net, and Socket as network addr\n");
__nat25_generate_ipx_network_addr_with_socket(networkAddr, &ipx->ipx_source.net, &ipx->ipx_source.sock);
/* change IPX source node addr to wlan STA address */
memcpy(ipx->ipx_source.node, GET_MY_HWADDR(priv), ETH_ALEN);
}
else
{
__nat25_generate_ipx_network_addr_with_node(networkAddr, &ipx->ipx_source.net, ipx->ipx_source.node);
}
__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
__nat25_db_print(priv);
}
return 0;
case NAT25_LOOKUP:
{
if(!memcmp(GET_MY_HWADDR(priv), ipx->ipx_dest.node, ETH_ALEN))
{
DEBUG_INFO("NAT25: Lookup IPX, Modify Destination IPX Node addr\n");
__nat25_generate_ipx_network_addr_with_socket(networkAddr, &ipx->ipx_dest.net, &ipx->ipx_dest.sock);
__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
/* replace IPX destination node addr with Lookup destination MAC addr */
memcpy(ipx->ipx_dest.node, skb->data, ETH_ALEN);
}
else
{
__nat25_generate_ipx_network_addr_with_node(networkAddr, &ipx->ipx_dest.net, ipx->ipx_dest.node);
__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
}
}
return 0;
default:
return -1;
}
}
/* AARP */
else if(ea != NULL)
{
/* Sanity check fields. */
if(ea->hw_len != ETH_ALEN || ea->pa_len != AARP_PA_ALEN)
{
DEBUG_WARN("NAT25: Appletalk AARP Sanity check fail!\n");
return -1;
}
switch(method)
{
case NAT25_CHECK:
return 0;
case NAT25_INSERT:
{
/* change to AARP source mac address to wlan STA address */
memcpy(ea->hw_src, GET_MY_HWADDR(priv), ETH_ALEN);
DEBUG_INFO("NAT25: Insert AARP, Source=%d,%d Destination=%d,%d\n",
ea->pa_src_net,
ea->pa_src_node,
ea->pa_dst_net,
ea->pa_dst_node);
__nat25_generate_apple_network_addr(networkAddr, &ea->pa_src_net, &ea->pa_src_node);
__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
__nat25_db_print(priv);
}
return 0;
case NAT25_LOOKUP:
{
DEBUG_INFO("NAT25: Lookup AARP, Source=%d,%d Destination=%d,%d\n",
ea->pa_src_net,
ea->pa_src_node,
ea->pa_dst_net,
ea->pa_dst_node);
__nat25_generate_apple_network_addr(networkAddr, &ea->pa_dst_net, &ea->pa_dst_node);
__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
/* change to AARP destination mac address to Lookup result */
memcpy(ea->hw_dst, skb->data, ETH_ALEN);
}
return 0;
default:
return -1;
}
}
/* DDP */
else if(ddp != NULL)
{
switch(method)
{
case NAT25_CHECK:
return -1;
case NAT25_INSERT:
{
DEBUG_INFO("NAT25: Insert DDP, Source=%d,%d Destination=%d,%d\n",
ddp->deh_snet,
ddp->deh_snode,
ddp->deh_dnet,
ddp->deh_dnode);
__nat25_generate_apple_network_addr(networkAddr, &ddp->deh_snet, &ddp->deh_snode);
__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
__nat25_db_print(priv);
}
return 0;
case NAT25_LOOKUP:
{
DEBUG_INFO("NAT25: Lookup DDP, Source=%d,%d Destination=%d,%d\n",
ddp->deh_snet,
ddp->deh_snode,
ddp->deh_dnet,
ddp->deh_dnode);
__nat25_generate_apple_network_addr(networkAddr, &ddp->deh_dnet, &ddp->deh_dnode);
__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
}
return 0;
default:
return -1;
}
}
return -1;
}
/*---------------------------------------------------*/
/* Handle PPPoE frame */
/*---------------------------------------------------*/
else if((protocol == ETH_P_PPP_DISC) ||
(protocol == ETH_P_PPP_SES))
{
struct pppoe_hdr *ph = (struct pppoe_hdr *)(skb->data + ETH_HLEN);
__be16 *pMagic;
switch(method)
{
case NAT25_CHECK:
if (ph->sid == 0)
return 0;
return 1;
case NAT25_INSERT:
if(ph->sid == 0) /* Discovery phase according to tag */
{
if(ph->code == PADI_CODE || ph->code == PADR_CODE)
{
if (priv->ethBrExtInfo.addPPPoETag) {
struct pppoe_tag *tag, *pOldTag;
unsigned char tag_buf[40];
int old_tag_len=0;
tag = (struct pppoe_tag *)tag_buf;
pOldTag = (struct pppoe_tag *)__nat25_find_pppoe_tag(ph, ntohs(PTT_RELAY_SID));
if (pOldTag) { /* if SID existed, copy old value and delete it */
old_tag_len = ntohs(pOldTag->tag_len);
if (old_tag_len+TAG_HDR_LEN+MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN > sizeof(tag_buf)) {
DEBUG_ERR("SID tag length too long!\n");
return -1;
}
memcpy(tag->tag_data+MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN,
pOldTag->tag_data, old_tag_len);
if (skb_pull_and_merge(skb, (unsigned char *)pOldTag, TAG_HDR_LEN+old_tag_len) < 0) {
DEBUG_ERR("call skb_pull_and_merge() failed in PADI/R packet!\n");
return -1;
}
ph->length = htons(ntohs(ph->length)-TAG_HDR_LEN-old_tag_len);
}
tag->tag_type = PTT_RELAY_SID;
tag->tag_len = htons(MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN+old_tag_len);
/* insert the magic_code+client mac in relay tag */
pMagic = (__be16 *)tag->tag_data;
*pMagic = htons(MAGIC_CODE);
memcpy(tag->tag_data+MAGIC_CODE_LEN, skb->data+ETH_ALEN, ETH_ALEN);
/* Add relay tag */
if(__nat25_add_pppoe_tag(skb, tag) < 0)
return -1;
DEBUG_INFO("NAT25: Insert PPPoE, forward %s packet\n",
(ph->code == PADI_CODE ? "PADI" : "PADR"));
}
else { /* not add relay tag */
if (priv->pppoe_connection_in_progress &&
memcmp(skb->data+ETH_ALEN, priv->pppoe_addr, ETH_ALEN)) {
DEBUG_ERR("Discard PPPoE packet due to another PPPoE connection is in progress!\n");
return -2;
}
if (priv->pppoe_connection_in_progress == 0)
memcpy(priv->pppoe_addr, skb->data+ETH_ALEN, ETH_ALEN);
priv->pppoe_connection_in_progress = WAIT_TIME_PPPOE;
}
}
else
return -1;
}
else /* session phase */
{
DEBUG_INFO("NAT25: Insert PPPoE, insert session packet to %s\n", skb->dev->name);
__nat25_generate_pppoe_network_addr(networkAddr, skb->data, &(ph->sid));
__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
__nat25_db_print(priv);
if (!priv->ethBrExtInfo.addPPPoETag &&
priv->pppoe_connection_in_progress &&
!memcmp(skb->data+ETH_ALEN, priv->pppoe_addr, ETH_ALEN))
priv->pppoe_connection_in_progress = 0;
}
return 0;
case NAT25_LOOKUP:
if(ph->code == PADO_CODE || ph->code == PADS_CODE)
{
if (priv->ethBrExtInfo.addPPPoETag) {
struct pppoe_tag *tag;
unsigned char *ptr;
unsigned short tagType, tagLen;
int offset=0;
if((ptr = __nat25_find_pppoe_tag(ph, ntohs(PTT_RELAY_SID))) == NULL) {
DEBUG_ERR("Fail to find PTT_RELAY_SID in FADO!\n");
return -1;
}
tag = (struct pppoe_tag *)ptr;
tagType = (unsigned short)((ptr[0] << 8) + ptr[1]);
tagLen = (unsigned short)((ptr[2] << 8) + ptr[3]);
if((tagType != ntohs(PTT_RELAY_SID)) || (tagLen < (MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN))) {
DEBUG_ERR("Invalid PTT_RELAY_SID tag length [%d]!\n", tagLen);
return -1;
}
pMagic = (__be16 *)tag->tag_data;
if (ntohs(*pMagic) != MAGIC_CODE) {
DEBUG_ERR("Can't find MAGIC_CODE in %s packet!\n",
(ph->code == PADO_CODE ? "PADO" : "PADS"));
return -1;
}
memcpy(skb->data, tag->tag_data+MAGIC_CODE_LEN, ETH_ALEN);
if (tagLen > MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN)
offset = TAG_HDR_LEN;
if (skb_pull_and_merge(skb, ptr+offset, TAG_HDR_LEN+MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN-offset) < 0) {
DEBUG_ERR("call skb_pull_and_merge() failed in PADO packet!\n");
return -1;
}
ph->length = htons(ntohs(ph->length)-(TAG_HDR_LEN+MAGIC_CODE_LEN+RTL_RELAY_TAG_LEN-offset));
if (offset > 0)
tag->tag_len = htons(tagLen-MAGIC_CODE_LEN-RTL_RELAY_TAG_LEN);
DEBUG_INFO("NAT25: Lookup PPPoE, forward %s Packet from %s\n",
(ph->code == PADO_CODE ? "PADO" : "PADS"), skb->dev->name);
}
else { /* not add relay tag */
if (!priv->pppoe_connection_in_progress) {
DEBUG_ERR("Discard PPPoE packet due to no connection in progresss!\n");
return -1;
}
memcpy(skb->data, priv->pppoe_addr, ETH_ALEN);
priv->pppoe_connection_in_progress = WAIT_TIME_PPPOE;
}
}
else {
if(ph->sid != 0)
{
DEBUG_INFO("NAT25: Lookup PPPoE, lookup session packet from %s\n", skb->dev->name);
__nat25_generate_pppoe_network_addr(networkAddr, skb->data+ETH_ALEN, &(ph->sid));
__nat25_db_network_lookup_and_replace(priv, skb, networkAddr);
__nat25_db_print(priv);
}
else
return -1;
}
return 0;
default:
return -1;
}
}
/*---------------------------------------------------*/
/* Handle EAP frame */
/*---------------------------------------------------*/
else if(protocol == 0x888e)
{
switch(method)
{
case NAT25_CHECK:
return -1;
case NAT25_INSERT:
return 0;
case NAT25_LOOKUP:
return 0;
default:
return -1;
}
}
/*---------------------------------------------------*/
/* Handle C-Media proprietary frame */
/*---------------------------------------------------*/
else if((protocol == 0xe2ae) ||
(protocol == 0xe2af))
{
switch(method)
{
case NAT25_CHECK:
return -1;
case NAT25_INSERT:
return 0;
case NAT25_LOOKUP:
return 0;
default:
return -1;
}
}
/*---------------------------------------------------*/
/* Handle IPV6 frame */
/*---------------------------------------------------*/
#ifdef CL_IPV6_PASS
else if(protocol == ETH_P_IPV6)
{
struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + ETH_HLEN);
if (sizeof(*iph) >= (skb->len - ETH_HLEN))
{
DEBUG_WARN("NAT25: malformed IPv6 packet !\n");
return -1;
}
switch(method)
{
case NAT25_CHECK:
if (skb->data[0] & 1)
return 0;
return -1;
case NAT25_INSERT:
{
DEBUG_INFO("NAT25: Insert IP, SA=%4x:%4x:%4x:%4x:%4x:%4x:%4x:%4x,"
" DA=%4x:%4x:%4x:%4x:%4x:%4x:%4x:%4x\n",
iph->saddr.s6_addr16[0],iph->saddr.s6_addr16[1],iph->saddr.s6_addr16[2],iph->saddr.s6_addr16[3],
iph->saddr.s6_addr16[4],iph->saddr.s6_addr16[5],iph->saddr.s6_addr16[6],iph->saddr.s6_addr16[7],
iph->daddr.s6_addr16[0],iph->daddr.s6_addr16[1],iph->daddr.s6_addr16[2],iph->daddr.s6_addr16[3],
iph->daddr.s6_addr16[4],iph->daddr.s6_addr16[5],iph->daddr.s6_addr16[6],iph->daddr.s6_addr16[7]);
if (memcmp(&iph->saddr, "\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0", 16)) {
__nat25_generate_ipv6_network_addr(networkAddr, (unsigned int *)&iph->saddr);
__nat25_db_network_insert(priv, skb->data+ETH_ALEN, networkAddr);
__nat25_db_print(priv);
if (iph->nexthdr == IPPROTO_ICMPV6 &&
skb->len > (ETH_HLEN + sizeof(*iph) + 4)) {
if (update_nd_link_layer_addr(skb->data + ETH_HLEN + sizeof(*iph),
skb->len - ETH_HLEN - sizeof(*iph), GET_MY_HWADDR(priv))) {
struct icmp6hdr *hdr = (struct icmp6hdr *)(skb->data + ETH_HLEN + sizeof(*iph));
hdr->icmp6_cksum = 0;
hdr->icmp6_cksum = csum_ipv6_magic(&iph->saddr, &iph->daddr,
be16_to_cpu(iph->payload_len),
IPPROTO_ICMPV6,
csum_partial((__u8 *)hdr, be16_to_cpu(iph->payload_len), 0));
}
}
}
}
return 0;
case NAT25_LOOKUP:
DEBUG_INFO("NAT25: Lookup IP, SA=%4x:%4x:%4x:%4x:%4x:%4x:%4x:%4x,"
" DA=%4x:%4x:%4x:%4x:%4x:%4x:%4x:%4x\n",
iph->saddr.s6_addr16[0],iph->saddr.s6_addr16[1],iph->saddr.s6_addr16[2],iph->saddr.s6_addr16[3],
iph->saddr.s6_addr16[4],iph->saddr.s6_addr16[5],iph->saddr.s6_addr16[6],iph->saddr.s6_addr16[7],
iph->daddr.s6_addr16[0],iph->daddr.s6_addr16[1],iph->daddr.s6_addr16[2],iph->daddr.s6_addr16[3],
iph->daddr.s6_addr16[4],iph->daddr.s6_addr16[5],iph->daddr.s6_addr16[6],iph->daddr.s6_addr16[7]);
__nat25_generate_ipv6_network_addr(networkAddr, (unsigned int *)&iph->daddr);
if (!__nat25_db_network_lookup_and_replace(priv, skb, networkAddr)) {
#ifdef SUPPORT_RX_UNI2MCAST
if (iph->daddr.s6_addr[0] == 0xff)
convert_ipv6_mac_to_mc(skb);
#endif
}
return 0;
default:
return -1;
}
}
#endif /* CL_IPV6_PASS */
return -1;
}
int nat25_handle_frame(struct adapter *priv, struct sk_buff *skb)
{
if(!(skb->data[0] & 1))
{
int is_vlan_tag=0, i, retval=0;
unsigned short vlan_hdr=0;
if (*((__be16 *)(skb->data+ETH_ALEN*2)) == __constant_htons(ETH_P_8021Q)) {
is_vlan_tag = 1;
vlan_hdr = *((unsigned short *)(skb->data+ETH_ALEN*2+2));
for (i=0; i<6; i++)
*((unsigned short *)(skb->data+ETH_ALEN*2+2-i*2)) = *((unsigned short *)(skb->data+ETH_ALEN*2-2-i*2));
skb_pull(skb, 4);
}
if (!priv->ethBrExtInfo.nat25_disable)
{
_irqL irqL;
spin_lock_bh(&priv->br_ext_lock);
/*
* This function look up the destination network address from
* the NAT2.5 database. Return value = -1 means that the
* corresponding network protocol is NOT support.
*/
if (!priv->ethBrExtInfo.nat25sc_disable &&
(*((__be16 *)(skb->data+ETH_ALEN*2)) == __constant_htons(ETH_P_IP)) &&
!memcmp(priv->scdb_ip, skb->data+ETH_HLEN+16, 4)) {
memcpy(skb->data, priv->scdb_mac, ETH_ALEN);
spin_unlock_bh(&priv->br_ext_lock);
}
else {
spin_unlock_bh(&priv->br_ext_lock);
retval = nat25_db_handle(priv, skb, NAT25_LOOKUP);
}
}
else {
if (((*((__be16 *)(skb->data+ETH_ALEN*2)) == __constant_htons(ETH_P_IP)) &&
!memcmp(priv->br_ip, skb->data+ETH_HLEN+16, 4)) ||
((*((__be16 *)(skb->data+ETH_ALEN*2)) == __constant_htons(ETH_P_ARP)) &&
!memcmp(priv->br_ip, skb->data+ETH_HLEN+24, 4))) {
/* for traffic to upper TCP/IP */
retval = nat25_db_handle(priv, skb, NAT25_LOOKUP);
}
}
if (is_vlan_tag) {
skb_push(skb, 4);
for (i=0; i<6; i++)
*((__be16 *)(skb->data+i*2)) = *((__be16 *)(skb->data+4+i*2));
*((__be16 *)(skb->data+ETH_ALEN*2)) = __constant_htons(ETH_P_8021Q);
*((__be16 *)(skb->data+ETH_ALEN*2+2)) = cpu_to_be16(vlan_hdr);
}
if(retval == -1) {
return -1;
}
}
return 0;
}
#define SERVER_PORT 67
#define CLIENT_PORT 68
#define DHCP_MAGIC 0x63825363
#define BROADCAST_FLAG 0x8000
struct dhcpMessage {
u_int8_t op;
u_int8_t htype;
u_int8_t hlen;
u_int8_t hops;
u_int32_t xid;
u_int16_t secs;
u_int16_t flags;
u_int32_t ciaddr;
u_int32_t yiaddr;
u_int32_t siaddr;
u_int32_t giaddr;
u_int8_t chaddr[16];
u_int8_t sname[64];
u_int8_t file[128];
u_int32_t cookie;
u_int8_t options[308]; /* 312 - cookie */
};
void dhcp_flag_bcast(struct adapter *priv, struct sk_buff *skb)
{
if(skb == NULL)
return;
if(!priv->ethBrExtInfo.dhcp_bcst_disable) {
__be16 protocol = *((__be16 *)(skb->data + 2 * ETH_ALEN));
if(protocol == __constant_htons(ETH_P_IP)) /* IP */
{
struct iphdr* iph = (struct iphdr *)(skb->data + ETH_HLEN);
if(iph->protocol == IPPROTO_UDP) /* UDP */
{
struct udphdr *udph = (struct udphdr *)((SIZE_PTR)iph + (iph->ihl << 2));
if((udph->source == __constant_htons(CLIENT_PORT))
&& (udph->dest == __constant_htons(SERVER_PORT))) /* DHCP request */
{
struct dhcpMessage *dhcph =
(struct dhcpMessage *)((SIZE_PTR)udph + sizeof(struct udphdr));
if(dhcph->cookie == DHCP_MAGIC) /* match magic word */
{
if(!(dhcph->flags & BROADCAST_FLAG)) /* if not broadcast */
{
register int sum = 0;
DEBUG_INFO("DHCP: change flag of DHCP request to broadcast.\n");
/* or BROADCAST flag */
dhcph->flags |= BROADCAST_FLAG;
/* recalculate checksum */
sum = ~(udph->check) & 0xffff;
sum += dhcph->flags;
while(sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);
udph->check = ~sum;
}
}
}
}
}
}
}
void *scdb_findEntry(struct adapter *priv, unsigned char *macAddr,
unsigned char *ipAddr)
{
unsigned char networkAddr[MAX_NETWORK_ADDR_LEN];
struct nat25_network_db_entry *db;
int hash;
__nat25_generate_ipv4_network_addr(networkAddr, (unsigned int *)ipAddr);
hash = __nat25_network_hash(networkAddr);
db = priv->nethash[hash];
while (db != NULL)
{
if(!memcmp(db->networkAddr, networkAddr, MAX_NETWORK_ADDR_LEN)) {
/* spin_unlock_bh(&priv->br_ext_lock); */
return (void *)db;
}
db = db->next_hash;
}
return NULL;
}
#endif /* CONFIG_BR_EXT */
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