struct connection *proxy_create(struct context *ctx, char *host, int port)
{
struct connection *proxy;
int fd = socket_create_server(host, port);
if (fd == -1) return NULL;
logger(INFO, "serve at %s:%d", host, port);
proxy = malloc(sizeof(struct connection));
proxy->ctx = ctx;
proxy->fd = fd;
proxy->ready = ready;
mbuf_queue_init(&proxy->buf_queue);
return proxy;
}
struct tcp_pcb * tcp_passive_open(struct tcp_listen_pcb * mux,
struct iphdr * iph,
struct tcphdr * th,
unsigned int optlen)
{
struct tcp_pcb * tp;
struct route * rt;
int new_head;
int cond;
new_head = mux->t_head + 1;
if (new_head == mux->t_max)
new_head = 0;
if (mux->t_tail == new_head) {
DCC_LOG(LOG_WARNING, "backlog limit");
return NULL;
}
if ((cond = thinkos_cond_alloc()) < 0) {
DCC_LOG(LOG_WARNING, "thinkos_cond_alloc()");
return NULL;
}
if ((tp = tcp_pcb_new(&__tcp__.active)) == NULL) {
DCC_LOG(LOG_WARNING, "tcp_pcb_new() failed!");
return NULL;
}
/* Set up the new PCB. */
tp->t_lport = th->th_dport;
tp->t_laddr = iph->daddr;
tp->t_fport = th->th_sport;
tp->t_faddr = iph->saddr;
tp->t_cond = cond;
/*
* TODO: max queue size...
*/
mbuf_queue_init(&tp->rcv_q);
mbuf_queue_init(&tp->snd_q);
if ((rt = __route_lookup(tp->t_faddr)) == NULL) {
DCC_LOG(LOG_WARNING, "no route to host");
tp->t_maxseg = tcp_defmss;
} else {
/* default mss to the network interface mtu. */
tp->t_route = rt;
tp->t_maxseg = rt->rt_ifn->if_mtu - (sizeof(struct tcphdr) +
sizeof(struct iphdr));
}
if (tp->t_maxseg > tcp_maxmss)
tp->t_maxseg = tcp_maxmss;
/* TODO: calculate the amount of space in receive window */
// tp->rcv_wnd = MIN(tcp_maxrcv, tcp_maxwin);
/* advertised window */
// tp->t_adv_wnd = 0;
if (optlen)
tcp_parse_options(tp, th, th->th_opt, optlen);
/* update the sequence numbers */
tp->rcv_nxt = ntohl(th->th_seq) + 1;
tp->snd_seq = (++__tcp__.iss << 20);
tp->snd_off = 0;
tp->snd_max = 0;
/* set the connection-establishment timer to 75 seconds */
tp->t_conn_tmr = tcp_conn_est_tmo;
tp->snd_wnd = ntohs(th->th_win);
DCC_LOG2(LOG_INFO, "maxseg=%d snd_wnd=%d",
tp->t_maxseg, tp->snd_wnd);
/* TODO: initialization of receive urgent pointer */
tp->t_state = TCPS_SYN_RCVD;
DCC_LOG3(LOG_INFO, "<%05x> %I:%d [SYN_RCVD]",
(int)tp, tp->t_faddr, ntohs(tp->t_fport));
/* XXX: don't respond now - the upper layer must call the tcp_accept()
function to send back the SYNC and finish handshaking. */
tp->t_flags = TF_ACKNOW;
/* insert into backlog */
mux->t_backlog[mux->t_head] = tp;
mux->t_head = new_head;
thinkos_sem_post(mux->t_sem);
return tp;
}
