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Diffstat (limited to 'drivers/staging/r8188eu/core/rtw_br_ext.c')
-rw-r--r--drivers/staging/r8188eu/core/rtw_br_ext.c660
1 files changed, 660 insertions, 0 deletions
diff --git a/drivers/staging/r8188eu/core/rtw_br_ext.c b/drivers/staging/r8188eu/core/rtw_br_ext.c
new file mode 100644
index 000000000..4c5f30792
--- /dev/null
+++ b/drivers/staging/r8188eu/core/rtw_br_ext.c
@@ -0,0 +1,660 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2007 - 2011 Realtek Corporation. i*/
+
+#define _RTW_BR_EXT_C_
+
+#include "../include/linux/if_arp.h"
+#include "../include/net/ip.h"
+#include "../include/linux/atalk.h"
+#include "../include/linux/udp.h"
+#include "../include/linux/if_pppox.h"
+
+#include "../include/drv_types.h"
+#include "../include/rtw_br_ext.h"
+#include "../include/usb_osintf.h"
+
+#ifndef csum_ipv6_magic
+#include "../include/net/ip6_checksum.h"
+#endif
+
+#include "../include/linux/ipv6.h"
+#include "../include/linux/icmpv6.h"
+#include "../include/net/ndisc.h"
+#include "../include/net/checksum.h"
+
+#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 = (unsigned char *)ph->tag;
+ 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 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)
+ 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 int __nat25_has_expired(struct nat25_network_db_entry *fdb)
+{
+ if (time_before_eq(fdb->ageing_timer, jiffies - NAT25_AGEING_TIME * HZ))
+ 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);
+}
+
+static 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);
+}
+
+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) {
+ 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) {
+ 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) {
+ 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) {
+ 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) {
+ memcpy(mac, replace_mac, 6);
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+
+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);
+ } 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);
+ } 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(struct adapter *priv,
+ struct nat25_network_db_entry *ent, int hash)
+{
+ /* Caller must spin_lock already! */
+ ent->next_hash = priv->nethash[hash];
+ if (ent->next_hash)
+ ent->next_hash->pprev_hash = &ent->next_hash;
+ priv->nethash[hash] = ent;
+ ent->pprev_hash = &priv->nethash[hash];
+}
+
+static void __network_hash_unlink(struct nat25_network_db_entry *ent)
+{
+ /* Caller must spin_lock already! */
+ *ent->pprev_hash = ent->next_hash;
+ if (ent->next_hash)
+ ent->next_hash->pprev_hash = ent->pprev_hash;
+ ent->next_hash = NULL;
+ ent->pprev_hash = NULL;
+}
+
+static void __nat25_db_network_insert(struct adapter *priv,
+ unsigned char *macAddr, unsigned char *networkAddr)
+{
+ struct nat25_network_db_entry *db;
+ int hash;
+
+ spin_lock_bh(&priv->br_ext_lock);
+ hash = __nat25_network_hash(networkAddr);
+ db = priv->nethash[hash];
+ while (db) {
+ 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 = kmalloc(sizeof(*db), GFP_ATOMIC);
+ if (!db) {
+ 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);
+}
+
+/*
+ * NAT2.5 interface
+ */
+
+void nat25_db_cleanup(struct adapter *priv)
+{
+ int i;
+
+ 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) {
+ 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);
+ kfree(f);
+ f = g;
+ }
+ }
+ spin_unlock_bh(&priv->br_ext_lock);
+}
+
+void nat25_db_expire(struct adapter *priv)
+{
+ int i;
+
+ 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) {
+ struct nat25_network_db_entry *g;
+
+ g = f->next_hash;
+ if (__nat25_has_expired(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);
+ kfree(f);
+ }
+ }
+ f = g;
+ }
+ }
+ spin_unlock_bh(&priv->br_ext_lock);
+}
+
+int nat25_db_handle(struct adapter *priv, struct sk_buff *skb, int method)
+{
+ unsigned short protocol;
+ unsigned char networkAddr[MAX_NETWORK_ADDR_LEN];
+ unsigned int tmp;
+
+ if (!skb)
+ 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))
+ return -1;
+
+ switch (method) {
+ case NAT25_CHECK:
+ return -1;
+ case NAT25_INSERT:
+ /* some multicast 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;
+ tmp = be32_to_cpu(iph->saddr);
+ __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);
+ return 0;
+ default:
+ return -1;
+ }
+ } else if (protocol == ETH_P_ARP) {
+ /*---------------------------------------------------*/
+ /* Handle ARP frame */
+ /*---------------------------------------------------*/
+ struct arphdr *arp = (struct arphdr *)(skb->data + ETH_HLEN);
+ unsigned char *arp_ptr = (unsigned char *)(arp + 1);
+ unsigned int *sender;
+
+ if (arp->ar_pro != htons(ETH_P_IP))
+ return -1;
+
+ switch (method) {
+ case NAT25_CHECK:
+ return 0; /* skb_copy for all ARP frame */
+ case NAT25_INSERT:
+ /* 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);
+ return 0;
+ default:
+ return -1;
+ }
+ } else if ((protocol == ETH_P_PPP_DISC) ||
+ (protocol == ETH_P_PPP_SES)) {
+ /*---------------------------------------------------*/
+ /* Handle PPPoE frame */
+ /*---------------------------------------------------*/
+ 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))
+ 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)
+ 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;
+ } else { /* not add relay tag */
+ if (priv->pppoe_connection_in_progress &&
+ memcmp(skb->data + ETH_ALEN,
+ priv->pppoe_addr,
+ ETH_ALEN))
+ 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 */
+ __nat25_generate_pppoe_network_addr(networkAddr, skb->data, &ph->sid);
+
+ __nat25_db_network_insert(priv, skb->data + ETH_ALEN, networkAddr);
+
+ 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;
+ default:
+ return -1;
+ }
+ } else if (protocol == 0x888e) {
+ /*---------------------------------------------------*/
+ /* Handle EAP frame */
+ /*---------------------------------------------------*/
+ switch (method) {
+ case NAT25_CHECK:
+ return -1;
+ case NAT25_INSERT:
+ return 0;
+ default:
+ return -1;
+ }
+ } else if ((protocol == 0xe2ae) || (protocol == 0xe2af)) {
+ /*---------------------------------------------------*/
+ /* Handle C-Media proprietary frame */
+ /*---------------------------------------------------*/
+ switch (method) {
+ case NAT25_CHECK:
+ return -1;
+ case NAT25_INSERT:
+ return 0;
+ default:
+ return -1;
+ }
+ } else if (protocol == ETH_P_IPV6) {
+ /*------------------------------------------------*/
+ /* Handle IPV6 frame */
+ /*------------------------------------------------*/
+ struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + ETH_HLEN);
+
+ if (sizeof(*iph) >= (skb->len - ETH_HLEN))
+ return -1;
+
+ switch (method) {
+ case NAT25_CHECK:
+ if (skb->data[0] & 1)
+ return 0;
+ return -1;
+ case NAT25_INSERT:
+ 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);
+
+ 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;
+ default:
+ return -1;
+ }
+ }
+ return -1;
+}
+
+#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;
+ __be16 secs;
+ __be16 flags;
+ __be32 ciaddr;
+ __be32 yiaddr;
+ __be32 siaddr;
+ __be32 giaddr;
+ u_int8_t chaddr[16];
+ u_int8_t sname[64];
+ u_int8_t file[128];
+ __be32 cookie;
+ u_int8_t options[308]; /* 312 - cookie */
+};
+
+void dhcp_flag_bcast(struct adapter *priv, struct sk_buff *skb)
+{
+ if (!skb)
+ 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_t)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_t)udph + sizeof(struct udphdr));
+ u32 cookie = be32_to_cpu((__be32)dhcph->cookie);
+
+ if (cookie == DHCP_MAGIC) { /* match magic word */
+ if (!(dhcph->flags & htons(BROADCAST_FLAG))) {
+ /* if not broadcast */
+ register int sum = 0;
+
+ /* or BROADCAST flag */
+ dhcph->flags |= htons(BROADCAST_FLAG);
+ /* recalculate checksum */
+ sum = ~(udph->check) & 0xffff;
+ sum += be16_to_cpu(dhcph->flags);
+ while (sum >> 16)
+ sum = (sum & 0xffff) + (sum >> 16);
+ udph->check = ~sum;
+ }
+ }
+ }
+ }
+ }
+ }
+}
+
+void *scdb_findEntry(struct adapter *priv, 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) {
+ if (!memcmp(db->networkAddr, networkAddr, MAX_NETWORK_ADDR_LEN)) {
+ return (void *)db;
+ }
+
+ db = db->next_hash;
+ }
+
+ return NULL;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-15 02:59:29 +0000