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split_tcp_gateway.cpp
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#include "split_tcp_gateway.h"
enum STATE
{
CLOSED,
LISTEN,
SYN_SENT,
SYN_REVD,
ESTABLISHED,
FIN_WAIT_1,
FIN_WAIT_2,
CLOSING,
TIME_WAIT,
CLOSE_WAIT,
LAST_ACK,
};
enum PHASE
{
NORMAL,
FAST_RTX,
PAUSE,
NORMAL_TIMEOUT,
};
struct SendDataPktQueue
{
ForwardPkt* head;
ForwardPkt* tail;
u_int size;
SendDataPktQueue()
{
head = tail = NULL;
size = 0;
}
~SendDataPktQueue()
{
struct ForwardPkt* h = NULL;
struct ForwardPkt* p = NULL;
while(head)
{
h = head;
p = h->next;
head = h;
if (head == NULL)
tail = head;
else
head->prev = NULL;
free(h);
}
}
u_int num()
{
return size;
}
bool IsEmpty()
{
if (head == NULL && tail == NULL)
return true;
else
return false;
}
ForwardPkt* FetchPkt(u_int seq_want)
{
struct ForwardPkt* p;
for (p = head; p; p = p->next)
{
if (p->seq_num == seq_want)
return p;
}
return NULL;
}
bool Dequeue(u_int ack_up)
{
struct ForwardPkt* h;
struct ForwardPkt* p;
if (head == NULL && tail == NULL)
{
printf("Queue is empty\n");
return true;
}
while(ack_up > head->seq_num)
{
h = head;
p = h->next;
head = p;
if (head == NULL)
{
tail = head;
free(h);
size --;
return false;
}
else
head->prev = NULL;
free(h);
size --;
}
return false;
}
void EnqueueAndSort(u_int seq_num, u_short data_len, u_short flag, DATA* data, struct pcap_pkthdr* header, const u_char* pkt_data)
{
ForwardPkt* pkt = (ForwardPkt *)malloc(sizeof(ForwardPkt));
pkt->seq_num = seq_num;
pkt->data_len = data_len;
pkt->ctr_flag = flag;
pkt->next = NULL;
pkt->prev = NULL;
pkt->num_dup = 0;
pkt->data = (void *)data;
memcpy(&pkt->header, header, sizeof(struct pcap_pkthdr));
memcpy(pkt->pkt_data, pkt_data, header->len);
size ++;
//printf("Enqueue packet seq_num: %u\n", pkt->seq_num);
if (head == NULL && tail == NULL)
{
head = tail = pkt;
return;
}
if (pkt->seq_num > tail->seq_num)
{
tail->next = pkt;
pkt->prev = tail;
tail = pkt;
}
else
{
struct ForwardPkt* p = NULL;
for (p = tail; p; p = p->prev)
{
if (pkt->seq_num > p->seq_num)
{
pkt->next = p->next;
pkt->prev = p;
p->next->prev = pkt;
p->next = pkt;
return;
}
else if (pkt->seq_num == p->seq_num)
{
//printf("Duplicate pkt\n");
pkt->num_dup ++;
return;
}
else
continue;
}
pkt->next = head;
head->prev = pkt;
head = pkt;
}
}
};
struct serverState
{
u_short send_data_id; // previous sent data identity
STATE state; // connection state
PHASE phase;
/* send sequence variables */
u_int snd_wnd; // advertised by receiver to gateway server
u_int snd_nxt; // send next
u_int snd_una; // send unacknowledged
u_int snd_max; // highest sequence number sent
u_int seq_nxt;
u_short win_limit;
BOOL ignore_adv_win;
u_short win_scale;
BOOL SACK_permitted;
serverState()
{
win_limit = 0; // set Adv win limit to be 0
ignore_adv_win = FALSE;
SACK_permitted = FALSE;
phase = NORMAL;
state = LISTEN;
win_scale = 0;
snd_wnd = snd_nxt = snd_una = snd_max = seq_nxt = 0;
}
void flush()
{
snd_wnd = snd_nxt = snd_una = snd_max = seq_nxt = 0;
win_limit = 0;
ignore_adv_win = FALSE;
SACK_permitted = FALSE;
win_scale = 0;
state = LISTEN;
phase = NORMAL;
}
};
struct clientState
{
u_short send_data_id; // previous sent data identity
STATE state; // connection state
/* receive sequence variables */
u_int rcv_wnd; // advertised by the gateway client to sender
u_int rcv_nxt; // receive next
u_int rcv_adv; // advertised window by other end
u_int snd_nxt;
u_int seq_nxt;
u_short win_scale;
u_short sender_win_scale;
ForwardPkt *httpRequest; // http request packet
u_short ack_count;
sack_header sack;
clientState()
{
httpRequest = new ForwardPkt();
httpRequest->initPkt();
win_scale = sender_win_scale = 0;
ack_count = 0;
send_data_id = rcv_wnd = rcv_nxt = rcv_adv = snd_nxt = seq_nxt = 0;
}
void flush()
{
send_data_id = rcv_wnd = rcv_nxt = rcv_adv = snd_nxt = seq_nxt = 0;
httpRequest->initPkt();
win_scale = sender_win_scale = 0;
ack_count = 0;
state = LISTEN;
sack.flush();
}
~clientState()
{
delete httpRequest;
}
};
struct TCB;
struct conn_state
{
u_long_long initial_time;
u_char client_mac_address[6];
u_char server_mac_address[6];
ip_address client_ip_address;
ip_address server_ip_address;
u_short cPort;
u_short sPort;
ForwardPktBuffer dataPktBuffer;
pthread_mutex_t mutex;
pthread_cond_t m_eventElementAvailable;
pthread_cond_t m_eventSpaceAvailable;
serverState server_state;
clientState client_state;
// For Experiment Output
FILE* rttFd;
u_int send_rate;
u_int RTT;
u_int LAST_RTT;
u_int RTT_limit;
u_int mdev;
u_int nxt_timed_seqno;
u_long_long last_ack_rcv_time;
u_int last_ack_seqno;
u_long_long cur_ack_rcv_time;
u_int cur_ack_seqno;
u_int cumul_ack;
u_int accounted_for;
u_int rcv_thrughput_approx;
u_int rcv_thrughput;
u_int ack_interarrival_time;
u_int dft_cumul_ack;
u_int rto;
u_int rtt_std_dev;
tcp_sack_block sack_block[NUM_SACK_BLOCK];
u_short sack_block_num;
u_int sack_diff;
u_int undup_sack_diff;
u_short sack_target_block;
u_int max_sack_edge;
u_int rcv_max_seq_edge;
u_long_long ref_ack_time;
u_int ref_ack_seq_no;
u_short MSS;
u_int zero_window_seq_no;
SlideWindow sliding_avg_win;
u_int FRTO_ack_count;
u_int FRTO_dup_ack_count;
BOOL send_out_awin; //use in fast retransmit
u_int max_data_len;
#ifdef STD_RTT
u_int RTT_IETF;
u_int rtt_std_dev_ietf;
u_int rto_ietf;
u_int nxt_timed_seqno_ietf;
#endif
TCB *_tcb;
conn_state(u_int count): dataPktBuffer(count), sliding_avg_win (SLIDING_WIN_SIZE, 0, 0)
{
init_state();
}
conn_state(u_char client_mac[], u_char server_mac[], ip_address client_ip, ip_address server_ip, u_short client_port, u_short server_port, u_int count) : client_ip_address(client_ip), server_ip_address(server_ip), cPort(client_port), sPort(server_port), dataPktBuffer(count), sliding_avg_win (SLIDING_WIN_SIZE, 0, 0)
{
client_ip_address = client_ip;
server_ip_address = server_ip;
cPort = client_port;
sPort = server_port;
initial_time = timer.Start();
memcpy(client_mac_address, client_mac, 6);
memcpy(server_mac_address, server_mac, 6);
init_state();
}
void inline init_state()
{
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&m_eventSpaceAvailable, NULL );
pthread_cond_init(&m_eventElementAvailable, NULL);
rttFd = NULL;
_tcb = NULL;
initial_time = 0;
RTT = 0; //us
LAST_RTT = 0; //us
RTT_limit = RTT_LIMIT; //us
rtt_std_dev = 0;
mdev = 0;
last_ack_rcv_time = last_ack_seqno = cur_ack_rcv_time = cur_ack_seqno = cumul_ack = accounted_for = rcv_thrughput_approx = rcv_thrughput = 0;
ack_interarrival_time = dft_cumul_ack = 0;
rto = MAX_RTO; //us
sack_block_num = 0;
sack_target_block = 0;
rcv_max_seq_edge = 0;
sack_diff = 0;
max_sack_edge = 0;
undup_sack_diff = 0;
for (u_short i = 0; i < NUM_SACK_BLOCK; i ++)
{
sack_block[i].left_edge_block = sack_block[i].right_edge_block = 0;
}
ref_ack_time = 0;
ref_ack_seq_no = 0;
send_out_awin = FALSE;
MSS = 1460; //wired network
//nxt_ack_seqno = 0;
nxt_timed_seqno = 0;
zero_window_seq_no = 0;
max_data_len = 0;
#ifdef STD_RTT
RTT_IETF = 0;
rtt_std_dev_ietf = 0;
rto_ietf = MAX_RTO_IETF;
nxt_timed_seqno_ietf = 0;
#endif
FRTO_ack_count = FRTO_dup_ack_count = 0;
ref_ack_time = 0;
ref_ack_seq_no = 0;
//reset_timer = FALSE;
}
void inline init_state_ex(u_char client_mac[], u_char server_mac[], ip_address client_ip, ip_address server_ip, u_short client_port, u_short server_port, TCB *tcb)
{
client_ip_address = client_ip;
server_ip_address = server_ip;
cPort = client_port;
sPort = server_port;
initial_time = timer.Start();
_tcb = tcb;
memcpy(client_mac_address, client_mac, 6);
memcpy(server_mac_address, server_mac, 6);
}
void inline flush()
{
if (rttFd)
{
fclose(rttFd);
rttFd = NULL;
}
sliding_avg_win.flush();
client_state.flush();
server_state.flush();
dataPktBuffer.flush();
_tcb = NULL;
initial_time = 0;
RTT = 0; //ms
LAST_RTT = 0; //ms
RTT_limit = RTT_LIMIT; //ms
rtt_std_dev = 0;
mdev = 0;
last_ack_rcv_time = last_ack_seqno = cur_ack_rcv_time = cur_ack_seqno = cumul_ack = accounted_for = rcv_thrughput_approx = rcv_thrughput = 0;
ack_interarrival_time = dft_cumul_ack = 0;
rto = MAX_RTO; //ms
sack_block_num = 0;
sack_target_block = 0;
rcv_max_seq_edge = 0;
sack_diff = 0;
max_sack_edge = 0;
undup_sack_diff = 0;
for (u_short i = 0; i < NUM_SACK_BLOCK; i ++)
{
sack_block[i].left_edge_block = sack_block[i].right_edge_block = 0;
}
ref_ack_time = 0;
ref_ack_seq_no = 0;
send_out_awin = FALSE;
MSS = 1460; //wired network
//nxt_ack_seqno = 0;
nxt_timed_seqno = 0;
zero_window_seq_no = 0;
max_data_len = 0;
#ifdef STD_RTT
RTT_IETF = 0;
rtt_std_dev_ietf = 0;
rto_ietf = MAX_RTO_IETF;
nxt_timed_seqno_ietf = 0;
#endif
FRTO_ack_count = FRTO_dup_ack_count = 0;
ref_ack_time = last_ack_rcv_time = cur_ack_rcv_time;
ref_ack_seq_no = last_ack_seqno = cur_ack_seqno;
//reset_timer = FALSE;
initial_time = 0;
}
~conn_state()
{
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&m_eventElementAvailable);
pthread_cond_destroy(&m_eventSpaceAvailable);
}
};
struct TCB
{
conn_state* conn[MAX_CONN_STATES + 1];
u_int send_rate;
u_int send_rate_lower;
u_int send_rate_upper;
u_int aggre_bw_estimate;
u_int send_beyong_win;
u_int sample_rate;
pthread_cond_t m_eventConnStateAvailable;
pthread_mutex_t mutex;
state_array states;
SlideWindow sliding_avg_window;
SlideWindow sliding_snd_window;
u_int rcv_thrughput;
u_int rcv_thrughput_approx;
u_long_long initial_time;
ip_address client_ip_address;
ip_address server_ip_address;
u_int totalByteSent;
u_int RTT;
u_int RTT_limit;
u_long_long startTime;
u_int pkts_transit;
TCB():sliding_avg_window (SLIDING_WIN_SIZE, SLIDE_TIME_INTERVAL, SLIDE_TIME_DELTA), sliding_snd_window (SND_WIN_SIZE, 0, 0)
{
send_rate = INITIAL_RATE; //Bps
send_rate_lower = MIN_SEND_RATE; //Bps
send_rate_upper = MAX_SEND_RATE; //- 50000; //Bps
send_beyong_win = SND_BEYOND_WIN; // send beyong the advertising window
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&m_eventConnStateAvailable, NULL );
for (int i = 0; i < MAX_CONN_STATES + 1; i ++)
{
conn[i] = NULL;
}
rcv_thrughput = rcv_thrughput_approx = sample_rate = initial_time = pkts_transit = 0;
totalByteSent = RTT = 0;
RTT_limit = RTT_LIMIT;
startTime = timer.Start();
}
void init_tcb(ip_address client_ip, ip_address server_ip)
{
initial_time = startTime = timer.Start();
//sliding_avg_window.sample_time = initial_time;
client_ip_address = client_ip;
server_ip_address = server_ip;
}
void flush()
{
send_rate = INITIAL_RATE; //Bps
send_rate_lower = MIN_SEND_RATE; //Bps
send_rate_upper = MAX_SEND_RATE; //- 50000; //Bps
send_beyong_win = SND_BEYOND_WIN; // send beyong the advertising window
for (int i = 0; i < MAX_CONN_STATES + 1; i ++)
{
conn[i] = NULL;
}
rcv_thrughput = rcv_thrughput_approx = sample_rate = initial_time = pkts_transit = 0;
states.flush();
sliding_avg_window.flush();
//snd_window.flush();
totalByteSent = RTT = 0;
RTT_limit = RTT_LIMIT;
startTime = timer.Start();
initial_time = 0;
}
void add_conn(u_short sport, conn_state *new_conn)
{
conn[sport] = new_conn;
states.add(sport);
pthread_cond_signal(&m_eventConnStateAvailable);
}
~TCB()
{
pthread_cond_destroy(&m_eventConnStateAvailable);
pthread_mutex_destroy(&mutex);
for (int i = 0; i < MAX_CONN_STATES + 1; i ++)
{
if (conn[i] != NULL)
conn[i] = NULL;
}
}
};
conn_state *conn_table[TOTAL_NUM_CONN];
TCB *tcb_table[TOTAL_NUM_CONN];
struct mem_pool
{
state_array ex_tcb;
//state_array ex_conn;
pthread_cond_t m_eventConnStateAvailable;
pthread_mutex_t mutex;
u_int _size;
mem_pool()
{
printf("MOBILE ACCELERATOR INITIALIZES THE CONNECTION TABLES\n");
if ((test_file = fopen("parameters.txt", "r")) == NULL)
{
printf("file parameters.txt is missing or corrupted\n");
exit(-1);
}
fscanf(test_file, "%u\n", &APP_PORT_NUM);
fscanf(test_file, "%u\n", &APP_PORT_FORWARD);
fscanf(test_file, "%u\n", &MAX_SEND_RATE);
fscanf(test_file, "%u\n", &INITIAL_RATE);
fscanf(test_file, "%u\n", &MIN_SEND_RATE);
fscanf(test_file, "%u\n", &SND_BEYOND_WIN);
fscanf(test_file, "%u\n", &NUM_PKT_BEYOND_WIN);
fscanf(test_file, "%u\n", &BDP); // num of
fscanf(test_file, "%u\n", &RTT_LIMIT); //us
init_mem_pool();
}
void init_mem_pool()
{
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&m_eventConnStateAvailable, NULL );
_size = 0;
for (u_int i = 0; i < TOTAL_NUM_CONN; i ++)
{
conn_table[i] = new conn_state(CIRCULAR_BUF_SIZE);
}
printf("CONN MEMORY ALLOCATED\n");
for (u_int i = 0; i < TOTAL_NUM_CONN; i ++)
{
tcb_table[i] = new TCB;
}
printf("TCB MEMORY ALLOCATED");
}
void inline add_tcb(u_int value)
{
ex_tcb.add(value);
pthread_cond_signal(&m_eventConnStateAvailable);
}
void inline flush()
{
ex_tcb.flush();
_size = 0;
}
~mem_pool()
{
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&m_eventConnStateAvailable);
delete[] conn_table;
delete[] tcb_table;
}
}pool;
struct RateCtrlParam
{
Forward* forward_it;
u_int id;
};
u_int HashBernstein(const char *key, size_t len)
{
u_int hash = 5381;
for(u_int i = 0; i < len; ++i)
hash = 33 * hash + key[i];
return (hash ^ (hash >> 16)) % TOTAL_NUM_CONN;
}
struct conn_Htable
{
u_int size;
conn_Htable()
{
size = 0;
}
int Hash(const char *key, size_t len)
{
u_int i = HashBernstein(key, len);
if (size == TOTAL_NUM_CONN)
return -1;
while(conn_table[i]->initial_time)
{
i = (i + 1) % TOTAL_NUM_CONN;
}
size ++;
return i;
}
int search(const char *key, size_t len, u_short cPort)
{
u_int i = HashBernstein(key, len);
while (conn_table[i]->initial_time)
{
if (conn_table[i]->cPort == cPort)
return i;
i = (i + 1) % TOTAL_NUM_CONN;
}
return -1;
}
}conn_hash;
struct tcb_Htable
{
u_int size;
tcb_Htable()
{
size = 0;
}
int Hash(const char *key, size_t len)
{
u_int i = HashBernstein(key, len);
if (size == TOTAL_NUM_CONN)
return -1;
while(tcb_table[i]->initial_time)
{
i = (i + 1) % TOTAL_NUM_CONN;
}
size ++;
return i;
}
int search(const char *key, size_t len, ip_address *client_ip)
{
u_int i = HashBernstein(key, len);
while (tcb_table[i]->initial_time)
{
if (memcmp(&tcb_table[i]->client_ip_address, client_ip, sizeof(ip_address)) == 0)
return i;
i = (i + 1) % TOTAL_NUM_CONN;
}
return -1;
}
}tcb_hash;
char *iptos(u_long_long in)
{
static char output[IPTOSBUFFERS][3*4+3+1];
static short which;
u_char *p;
p = (u_char *)∈
which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
return output[which];
}
void ifprint(pcap_if_t *d)
{
pcap_addr_t *a;
char ip6str[128];
printf("%s\n",d->name); /* Name */
if (d->description)
printf("\tDescription: %s\n",d->description); /* Description */
printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no"); /* Loopback Address*/
/* IP addresses */
for(a=d->addresses;a;a=a->next) {
printf("\tAddress Family: #%d\n",a->addr->sa_family);
switch(a->addr->sa_family)
{
case AF_INET:
printf("\tAddress Family Name: AF_INET\n");
if (a->addr)
printf("\tAddress: %s\n",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr));
if (a->netmask)
printf("\tNetmask: %s\n",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr));
if (a->broadaddr)
printf("\tBroadcast Address: %s\n",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr));
if (a->dstaddr)
printf("\tDestination Address: %s\n",iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr));
break;
case AF_INET6:
printf("\tAddress Family Name: AF_INET6\n");
break;
default:
printf("\tAddress Family Name: Unknown\n");
break;
}
}
printf("\n");
}
void inline print_bw_info(u_short sport, u_int tcb_index)
{
#ifdef DEBUG
printf("STATE %d BUFFER %u %u ACK %u INTERARRIVAL TIME %u RTT %u RTO %u RTT STD %u SENDING RATE %u AGGREGATE ESTIMATED RATE %u INDIVIDUAL APPROX ESTIMATED RATE %u INDIVIDUAL INSTAN ESTIMATED RATE %u CONNID %hu\n",
tcb_table[tcb_index]->conn[sport]->server_state.phase, tcb_table[tcb_index]->conn[sport]->client_state.rcv_wnd,
tcb_table[tcb_index]->conn[sport]->dataPktBuffer.size(), tcb_table[tcb_index]->conn[sport]->server_state.snd_una,
tcb_table[tcb_index]->conn[sport]->ack_interarrival_time, tcb_table[tcb_index]->conn[sport]->RTT, tcb_table[tcb_index]->conn[sport]->rto,
tcb_table[tcb_index]->conn[sport]->rtt_std_dev, tcb_table[tcb_index]->send_rate, tcb_table[tcb_index]->rcv_thrughput_approx,
tcb_table[tcb_index]->send_rate_upper, tcb_table[tcb_index]->conn[sport]->rcv_thrughput_approx, sport);
#endif
}
u_short inline CheckSum(u_short * buffer, u_int size)
{
u_long_long cksum = 0;
while (size > 1)
{
cksum += *buffer++;
size -= sizeof(u_short);
}
if (size)
{
cksum += *(u_char *) buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >> 16);
return (u_short) (~cksum);
}
void inline init_retx_data_pkt(u_int tcb_index, u_short sport, u_int num_init)
{
u_int index = tcb_table[tcb_index]->conn[sport]->dataPktBuffer._unAck;
ForwardPkt *retx_pkt;
for (u_int i = 0; i < num_init; i ++)
{
retx_pkt = tcb_table[tcb_index]->conn[sport]->dataPktBuffer.pkt(index);
retx_pkt->snd_time = 0;
index = tcb_table[tcb_index]->conn[sport]->dataPktBuffer.pktNext(index);
}
}
void inline send_forward(DATA* data, struct pcap_pkthdr* header, const u_char* pkt_data)
{
pthread_mutex_lock(&data->forward->mutex);
while (data->forward->pktQueue.size() >= CIRCULAR_QUEUE_SIZE)
pthread_cond_wait(&data->forward->m_eventSpaceAvailable, &data->forward->mutex);
ForwardPkt *tmpForwardPkt = data->forward->pktQueue.tail();
tmpForwardPkt->data = (void *)data;
memcpy(&(tmpForwardPkt->header), header, sizeof(struct pcap_pkthdr));
memcpy(tmpForwardPkt->pkt_data, pkt_data, header->len);
data->forward->pktQueue.tailNext();
data->forward->pktQueue.increase();
pthread_cond_signal(&data->forward->m_eventElementAvailable);
pthread_mutex_unlock(&data->forward->mutex);
}
void inline send_wait_forward(DATA* data, struct pcap_pkthdr* header, const u_char* pkt_data) // test with wifi
{
pthread_mutex_lock(&data->forward->mutex);
while (data->forward->pktQueue.size() >= CIRCULAR_QUEUE_SIZE)
pthread_cond_wait(&data->forward->m_eventSpaceAvailable, &data->forward->mutex);
ForwardPkt *tmpForwardPkt = data->forward->pktQueue.tail();
tmpForwardPkt->data = (void *)data;
tmpForwardPkt->dPort = 18;
memcpy(&(tmpForwardPkt->header), header, sizeof(struct pcap_pkthdr));
memcpy(tmpForwardPkt->pkt_data, pkt_data, header->len);
data->forward->pktQueue.tailNext();
data->forward->pktQueue.increase();
pthread_cond_signal(&data->forward->m_eventElementAvailable);
pthread_mutex_unlock(&data->forward->mutex);
}
void inline send_backward(DATA* data, struct pcap_pkthdr* header, const u_char* pkt_data)
{
pthread_mutex_lock(&data->forward_back->mutex);
while (data->forward_back->pktQueue.size() >= CIRCULAR_QUEUE_SIZE)
pthread_cond_wait(&data->forward_back->m_eventSpaceAvailable, &data->forward_back->mutex);
ForwardPkt *tmpForwardPkt = data->forward_back->pktQueue.tail();
tmpForwardPkt->data = (void *)data;
memcpy(&(tmpForwardPkt->header), header, sizeof(struct pcap_pkthdr));
memcpy(tmpForwardPkt->pkt_data, pkt_data, header->len);
data->forward_back->pktQueue.tailNext();
data->forward_back->pktQueue.increase();
pthread_cond_signal(&data->forward_back->m_eventElementAvailable);
pthread_mutex_unlock(&data->forward_back->mutex);
}
void inline send_data_pkt(Forward* forward, ForwardPkt* tmpPkt)
{
pthread_mutex_lock(&forward->mutex);
while (forward->pktQueue.size() >= CIRCULAR_QUEUE_SIZE)
pthread_cond_wait(&forward->m_eventSpaceAvailable, &forward->mutex);
ForwardPkt *tmpForwardPkt = forward->pktQueue.tail();
tmpForwardPkt->tcb = tmpPkt->tcb;
tmpForwardPkt->index = tmpPkt->index;
tmpForwardPkt->sPort = tmpPkt->sPort;
tmpForwardPkt->dPort = tmpPkt->dPort;
tmpForwardPkt->seq_num = tmpPkt->seq_num;
tmpForwardPkt->data_len = tmpPkt->data_len;
tmpForwardPkt->data = tmpPkt->data;
memcpy(&(tmpForwardPkt->header), &(tmpPkt->header), sizeof(struct pcap_pkthdr));
memcpy(tmpForwardPkt->pkt_data, tmpPkt->pkt_data, tmpPkt->header.len);
forward->pktQueue.tailNext();
forward->pktQueue.increase();
pthread_cond_signal(&forward->m_eventElementAvailable);
pthread_mutex_unlock(&forward->mutex);
}
void inline send_ack_back(u_short dport, DATA* data, ip_address src_address, ip_address dst_address, u_char src_mac[], u_char dst_mac[], u_short src_port, u_short dst_port, u_int seq, u_int ack, u_short ctr_bits, u_short awin, u_short data_id, sack_header* sack)
{
mac_header macHeader;
ip_header ipHeader;
tcp_header tcpHeader;
psd_header psdHeader;
struct pcap_pkthdr capHeader;
if (sack->size())
{
tcp_sack tcpSackHeader;
tcpSackHeader.pad_1 = 1;
tcpSackHeader.pad_2 = 1;
tcpSackHeader.kind = 5;
tcpSackHeader.length = sack->size()*8+2;
u_char Buffer[sizeof(mac_header) + sizeof(ip_header) + sizeof(tcp_header) + sizeof(tcp_sack)] = {0};
u_short buffer_len;
buffer_len = sizeof(mac_header) + sizeof(ip_header) + sizeof(tcp_header) + (u_short)tcpSackHeader.length + 2;
capHeader.caplen = buffer_len;
capHeader.len = buffer_len;
for (int i = 0; i < sack->size(); i ++)
{
tcpSackHeader.sack_block[i].left_edge_block = htonl(sack->sack_list[i].left_edge_block);
tcpSackHeader.sack_block[i].right_edge_block = htonl(sack->sack_list[i].right_edge_block);
}
capHeader.ts.tv_sec = time(NULL);
capHeader.ts.tv_usec = 0;
memcpy(macHeader.mac_src, src_mac, 6);
memcpy(macHeader.mac_dst, dst_mac, 6);
macHeader.opt = htons(0x0800);
ipHeader.ver_ihl = (4 << 4 | sizeof(ip_header)/sizeof(u_int));
ipHeader.tos = 0;
ipHeader.tlen = htons(sizeof(ip_header) + sizeof(tcp_header) + (u_short)tcpSackHeader.length + 2);
ipHeader.identification = htons(data_id);
ipHeader.flags_fo = 0x40;
ipHeader.ttl = 128;
ipHeader.proto = IPPROTO_TCP;
ipHeader.crc = 0;
ipHeader.saddr = src_address;
ipHeader.daddr = dst_address;
tcpHeader.sport = htons(src_port);
tcpHeader.dport = htons(dst_port);
tcpHeader.seq_num = htonl(seq);
tcpHeader.ack_num = htonl(ack);
//tcpSackHeader.length = sack->size()*8+2 + (4-(sack->size()*8+2)%4);
tcpHeader.hdr_len_resv_code = htons((sizeof(tcp_header) + (u_short)tcpSackHeader.length + 2) / 4 << 12 | ctr_bits);
tcpHeader.window = htons(awin);
tcpHeader.crc = 0;
tcpHeader.urg_pointer = 0;
psdHeader.saddr = src_address;