int
tcp_rcv(PACKET pkt) /* NOTE: pkt has nb_prot pointing to IP header */
{
struct mbuf * m_in;
struct ip * bip; /* IP header, berkeley version */
struct tcphdr * tcpp;
unshort len; /* scratch length holder */
/* For TCP, the netport IP layer is modified to set nb_prot to the
* start of the IP header (not TCP). We need to do some further
* mods which the BSD code expects:
*/
bip = (struct ip *)pkt->nb_prot; /* get ip header */
len = ntohs(bip->ip_len); /* get length in local endian */
/* verify checksum of received packet */
tcpp = (struct tcphdr *)ip_data(bip);
if (tcp_cksum(bip) != tcpp->th_sum)
{
TCP_MIB_INC(tcpInErrs); /* keep MIB stats */
tcpstat.tcps_rcvbadsum++; /* keep BSD stats */
LOCK_NET_RESOURCE(FREEQ_RESID);
pk_free(pkt); /* punt packet */
UNLOCK_NET_RESOURCE(FREEQ_RESID);
return ENP_BAD_HEADER;
}
m_in = m_getnbuf(MT_RXDATA, 0);
if (!m_in){
LOCK_NET_RESOURCE(FREEQ_RESID);
pk_free(pkt);
UNLOCK_NET_RESOURCE(FREEQ_RESID);
return ENP_RESOURCE;
}
IN_PROFILER(PF_TCP, PF_ENTRY); /* measure time in TCP */
/* subtract IP header length from total IP packet length */
len -= ((unshort)(bip->ip_ver_ihl & 0x0f) << 2);
bip->ip_len = len; /* put TCP length in struct for TCP code to use */
/* set mbuf to point to start of IP header (not TCP) */
m_in->pkt = pkt;
m_in->m_data = pkt->nb_prot;
m_in->m_len = pkt->nb_plen;
m_in->m_base = pkt->nb_buff; /* ??? */
m_in->m_memsz = pkt->nb_blen; /* ??? */
tcp_input(m_in, pkt->net);
IN_PROFILER(PF_TCP, PF_EXIT); /* measure time in TCP */
return 0;
}
int
t_recv (long s,
char * buf,
int len,
int flag)
{
#ifdef SOCKDEBUG
char logbuf[10];
#endif
struct socket * so;
int err;
int sendlen = len;
so = LONG2SO(s);
#ifdef SOC_CHECK_ALWAYS
SOC_CHECK(so);
#endif
if ((so->so_state & SO_IO_OK) != SS_ISCONNECTED)
{
so->so_error = EPIPE;
#ifdef SOCKDEBUG
sprintf(logbuf, "t_recv: %d", so->so_error);
glog_with_type(LOG_TYPE_DEBUG, logbuf, 1);
#endif
return SOCKET_ERROR;
}
so->so_error = 0;
LOCK_NET_RESOURCE(NET_RESID);
IN_PROFILER(PF_TCP, PF_ENTRY); /* measure time in TCP */
INET_TRACE (INETM_IO, ("INET:recv: so %x, len %d\n", so, len));
err = soreceive(so, NULL, buf, &len, flag);
IN_PROFILER(PF_TCP, PF_EXIT); /* measure time in TCP */
UNLOCK_NET_RESOURCE(NET_RESID);
if(err)
{
so->so_error = err;
#ifdef SOCKDEBUG
sprintf(logbuf, "t_recv: %d", so->so_error);
glog_with_type(LOG_TYPE_DEBUG, logbuf, 1);
#endif
return SOCKET_ERROR;
}
/* return bytes we sent - the amount we wanted to send minus
* the amount left in the buffer.
*/
return (sendlen - len);
}
void
tk_block ()
{
char msg[255];
task * tk = tk_cur; /* the next task to run */
/* check if the guard word is still intact */
if (*(tk->tk_guard) != GUARDWORD)
{
sprintf(msg, "tk_block stack: task name = %s", tk->tk_name);
panic(msg);
return;
}
#ifdef NPDEBUG
if (TDEBUG)
dprintf("TASK: Task %s blocking.\n", tk->tk_name);
#endif
IN_PROFILER(PF_IDLE, PF_ENTRY); /* measure time in the idle loop */
/* find the next ready to run task */
do
{
tk = tk->tk_next;
/* see if a sleeping task is ready to wake */
if (tk->tk_waketick && tk->tk_waketick < cticks)
{
tk->tk_waketick = 0; /* clear wakeup tick flag */
break; /* go run this task */
}
} while ((tk->tk_flags & TF_AWAKE) == 0);
IN_PROFILER(PF_IDLE, PF_EXIT);
tk->tk_flags &= ~TF_AWAKE; /* clear wake flag before it runs */
tk_switch (tk); /* Run the next task. */
#ifdef NPDEBUG
if (TDEBUG)
dprintf("TASK: Task %s running\n", tk_cur->tk_name);
#endif
if (tk_died)
{
tk_del(tk_died); /* delete dead task */
tk_died = NULL; /* clear pointer/flag */
}
}
int
t_send(long s,
char * buf,
int len,
int flags)
{
struct socket * so;
int e; /* error holder */
int total_sent = 0;
int maxpkt;
int sendlen;
int sent;
so = LONG2SO(s);
#ifdef SOC_CHECK_ALWAYS
SOC_CHECK(so);
#endif
if ((so->so_state & SO_IO_OK) != SS_ISCONNECTED)
{
so->so_error = EPIPE;
return SOCKET_ERROR;
}
so->so_error = 0;
/* If this is not a stream socket, assume it is bound and pass to
* t_sendto() with a null sockaddr
*/
if (so->so_type != SOCK_STREAM)
return(t_sendto(s, buf, len, flags, NULL, 0));
maxpkt = TCP_MSS;
if(so->so_pcb)
{
struct tcpcb * tp;
tp = intotcpcb(so->so_pcb); /* get tcp structure with mss */
if(tp->t_maxseg) /* Make sure it's set */
maxpkt = tp->t_maxseg;
}
IN_PROFILER(PF_TCP, PF_ENTRY); /* measure time in TCP */
while (len)
{
if (len > maxpkt)
sendlen = maxpkt; /* take biggest block we can */
else
sendlen = len;
sent = sendlen;
LOCK_NET_RESOURCE(NET_RESID);
e = sosend (so, NULL, buf, &sendlen, flags);
UNLOCK_NET_RESOURCE(NET_RESID);
if (e != 0) /* sock_sendit failed? */
{
/* if we simply ran out of bufs, report back to caller. */
if ((e == ENOBUFS) || (e == EWOULDBLOCK))
{
/* if we actually sent something before running out
* of buffers, report what we sent;
* else, report the error and let the application
* retry the call later
*/
if (total_sent != 0)
{
so->so_error = 0;
break; /* break out of while(len) loop */
}
}
so->so_error = e;
return SOCKET_ERROR;
}
/* if we can't send anymore, return now */
if (sendlen != 0)
break; /* break out of while(len) loop */
/* adjust numbers & pointers, and go do next send loop */
sent -= sendlen; /* subtract anything that didn't get sent */
buf += sent;
len -= sent;
total_sent += sent;
}
IN_PROFILER(PF_TCP, PF_EXIT); /* measure time in TCP */
return total_sent;
}
/* FUNCTION: tk_block()
*
* Block the currently running task and run the next task in the
* circular list of tasks that is awake. Before returning, see if any
* cleanup has to be done for another task.
*
* PARAMS: task * pointer to currently executing task or NULL
*
* RETURN: none
*/
void
tk_block(TASK *tk_old)
{
TASK *tk, *tk_prev;
/* check the stack of the currently executing task for overflow */
if (tk_old != (TASK *)NULL)
{
/* check if the guard word is still intact */
if (*(tk_cur->tk_guard) != GUARDWORD)
{
dprintf("tk_block stack: task name = %s", tk_cur->tk_name);
dtrap();
return;
}
}
#ifdef NPDEBUG
if (TDEBUG)
dprintf("TASK: Task %s blocking.\n", tk_cur->tk_name);
#endif
IN_PROFILER(PF_IDLE, PF_ENTRY); /* measure time in the idle loop */
/* find the next ready to run task */
tk = tk_cur;
#ifdef DEBUG_TASK_STATE
dprintf("tk_block: %s, flags = %lx, event = %p\n",
tk->tk_name, tk->tk_flags, tk->tk_event);
#endif
do
{
tk_prev = tk;
tk = tk->tk_next;
/* TODO: check for deleted task here */
/* see if a sleeping task is ready to wake */
if ((tk->tk_flags & TF_TIMER) && TIME_EXP(tk->tk_waketick, CTICKS))
{
tk_timeout(tk); /* clean up after timeout */
}
} while (!(tk->tk_flags & TF_AWAKE));
IN_PROFILER(PF_IDLE, PF_EXIT);
tk->tk_count++; /* increment wakeup count */
tk_cur = tk; /* update current task pointer */
#ifdef NPDEBUG
if (TDEBUG)
dprintf("TASK: Task %s running\n", tk->tk_name);
#endif
#ifdef DEBUG_TASK_STATE
dprintf("tk_ready: %s, flags = %lx, event = %p\n",
tk->tk_name, tk->tk_flags, tk->tk_event);
#endif
tk_switch (tk, tk_old); /* Run the next task. */
if (tk_died)
{
tk_del(tk_died); /* delete dead task */
tk_died = NULL; /* clear pointer/flag */
}
}