/****************************************************************************** * * Copyright(c) 2007 - 2017 Realtek Corporation. * * 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. * *****************************************************************************/ #define _RTW_BR_EXT_C_ #ifdef __KERNEL__ #include #include #if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0)) #include #endif #include #include #include #endif #if 1 /* rtw_wifi_driver */ #include #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 #include #include #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)) #include #else #include #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 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 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 unsigned long __nat25_timeout(_adapter *priv) { unsigned long timeout; timeout = jiffies - NAT25_AGEING_TIME * HZ; return timeout; } static 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 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 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 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); } static 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; } #endif static 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) { RTW_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) { RTW_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) { RTW_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) { RTW_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) { RTW_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; } #ifdef SUPPORT_RX_UNI2MCAST 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 */ #endif /* SUPPORT_RX_UNI2MCAST */ static 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 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 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 RTW_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 RTW_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 } _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; RTW_INFO("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: { RTW_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 { __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 */ RTW_INFO("NAT25: Set DA as boardcast\n"); eth_broadcast_addr(skb->data); } else { /* forward unknow IP packet to upper TCP/IP */ RTW_INFO("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: { RTW_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: { RTW_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; } } #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)) { RTW_INFO("NAT25: Protocol=IPX (Ethernet II)\n"); ipx = (struct ipxhdr *)framePtr; } else { /* if(protocol <= __constant_htons(ETH_FRAME_LEN)) */ if (!memcmp(ipx_header, framePtr, 2)) { RTW_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 */ RTW_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)) { RTW_INFO("NAT25: Protocol=IPX (Ethernet 802.2)\n"); ipx = (struct ipxhdr *)framePtr; } else return -1; } } } /* IPX */ if (ipx != NULL) { switch (method) { case NAT25_CHECK: if (!memcmp(skb->data + ETH_ALEN, ipx->ipx_source.node, ETH_ALEN)) { RTW_INFO("NAT25: Check IPX skb_copy\n"); return 0; } return -1; case NAT25_INSERT: { RTW_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)) { RTW_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)) { RTW_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); RTW_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: { RTW_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: { RTW_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: { RTW_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; } #endif /*---------------------------------------------------*/ /* Handle PPPoE frame */ /*---------------------------------------------------*/ else if ((protocol == __constant_htons(ETH_P_PPP_DISC)) || (protocol == __constant_htons(ETH_P_PPP_SES))) { struct pppoe_hdr *ph = (struct pppoe_hdr *)(skb->data + ETH_HLEN); unsigned short *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 = (unsigned short *)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; RTW_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 */ RTW_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; ptr = __nat25_find_pppoe_tag(ph, ntohs(PTT_RELAY_SID)); if (ptr == 0) { 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 = (unsigned short *)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); RTW_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) { RTW_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 == __constant_htons(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 == __constant_htons(0xe2ae)) || (protocol == __constant_htons(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 == __constant_htons(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: { RTW_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, iph->payload_len, IPPROTO_ICMPV6, csum_partial((__u8 *)hdr, iph->payload_len, 0)); } } } } return 0; case NAT25_LOOKUP: RTW_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(_adapter *priv, struct sk_buff *skb) { #ifdef BR_EXT_DEBUG if ((!priv->ethBrExtInfo.nat25_disable) && (!(skb->data[0] & 1))) { panic_printk("NAT25: Input Frame: DA=%02x%02x%02x%02x%02x%02x SA=%02x%02x%02x%02x%02x%02x\n", skb->data[0], skb->data[1], skb->data[2], skb->data[3], skb->data[4], skb->data[5], skb->data[6], skb->data[7], skb->data[8], skb->data[9], skb->data[10], skb->data[11]); } #endif if (!(skb->data[0] & 1)) { int is_vlan_tag = 0, i, retval = 0; unsigned short vlan_hdr = 0; if (*((unsigned short *)(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; _enter_critical_bh(&priv->br_ext_lock, &irqL); /* * 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 && (*((unsigned short *)(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); _exit_critical_bh(&priv->br_ext_lock, &irqL); } else { _exit_critical_bh(&priv->br_ext_lock, &irqL); retval = nat25_db_handle(priv, skb, NAT25_LOOKUP); } } else { if (((*((unsigned short *)(skb->data + ETH_ALEN * 2)) == __constant_htons(ETH_P_IP)) && !memcmp(priv->br_ip, skb->data + ETH_HLEN + 16, 4)) || ((*((unsigned short *)(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++) *((unsigned short *)(skb->data + i * 2)) = *((unsigned short *)(skb->data + 4 + i * 2)); *((unsigned short *)(skb->data + ETH_ALEN * 2)) = __constant_htons(ETH_P_8021Q); *((unsigned short *)(skb->data + ETH_ALEN * 2 + 2)) = vlan_hdr; } if (retval == -1) { /* DEBUG_ERR("NAT25: Lookup fail!\n"); */ return -1; } } return 0; } #if 0 void mac_clone(_adapter *priv, unsigned char *addr) { struct sockaddr sa; memcpy(sa.sa_data, addr, ETH_ALEN); RTW_INFO("MAC Clone: Addr=%02x%02x%02x%02x%02x%02x\n", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); rtl8192cd_set_hwaddr(priv->dev, &sa); } int mac_clone_handle_frame(_adapter *priv, struct sk_buff *skb) { if (priv->ethBrExtInfo.macclone_enable && !priv->macclone_completed) { if (!(skb->data[ETH_ALEN] & 1)) { /* check any other particular MAC add */ if (memcmp(skb->data + ETH_ALEN, GET_MY_HWADDR(priv), ETH_ALEN) && ((priv->dev->br_port) && memcmp(skb->data + ETH_ALEN, priv->br_mac, ETH_ALEN))) { mac_clone(priv, skb->data + ETH_ALEN); priv->macclone_completed = 1; } } } return 0; } #endif /* 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(_adapter *priv, struct sk_buff *skb) { if (skb == NULL) return; if (!priv->ethBrExtInfo.dhcp_bcst_disable) { unsigned short protocol = *((unsigned short *)(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 == __constant_htonl(DHCP_MAGIC)) { /* match magic word */ if (!(dhcph->flags & htons(BROADCAST_FLAG))) { /* if not broadcast */ register int sum = 0; RTW_INFO("DHCP: change flag of DHCP request to broadcast.\n"); /* or BROADCAST flag */ dhcph->flags |= htons(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(_adapter *priv, unsigned char *macAddr, unsigned char *ipAddr) { unsigned char networkAddr[MAX_NETWORK_ADDR_LEN]; struct nat25_network_db_entry *db; int hash; /* _irqL irqL; */ /* _enter_critical_bh(&priv->br_ext_lock, &irqL); */ __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)) { /* _exit_critical_bh(&priv->br_ext_lock, &irqL); */ return (void *)db; } db = db->next_hash; } /* _exit_critical_bh(&priv->br_ext_lock, &irqL); */ return NULL; } #endif /* CONFIG_BR_EXT */