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minix/servers/inet/generic/tcp.c
Philip Homburg dd7220f234 Listen/accept. Read select for UDP.
2005-07-27 12:07:12 +00:00

2598 lines
58 KiB
C
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/*
tcp.c
Copyright 1995 Philip Homburg
*/
#include "inet.h"
#include "buf.h"
#include "clock.h"
#include "event.h"
#include "type.h"
#include "io.h"
#include "ip.h"
#include "sr.h"
#include "assert.h"
#include "rand256.h"
#include "tcp.h"
#include "tcp_int.h"
THIS_FILE
#define NOT_IMPLEMENTED 0
PUBLIC tcp_port_t *tcp_port_table;
PUBLIC tcp_fd_t tcp_fd_table[TCP_FD_NR];
PUBLIC tcp_conn_t tcp_conn_table[TCP_CONN_NR];
PUBLIC sr_cancel_t tcp_cancel_f;
FORWARD void tcp_main ARGS(( tcp_port_t *port ));
FORWARD int tcp_select ARGS(( int fd, unsigned operations ));
FORWARD acc_t *tcp_get_data ARGS(( int fd, size_t offset,
size_t count, int for_ioctl ));
FORWARD int tcp_put_data ARGS(( int fd, size_t offset,
acc_t *data, int for_ioctl ));
FORWARD void tcp_put_pkt ARGS(( int fd, acc_t *data, size_t datalen ));
FORWARD void read_ip_packets ARGS(( tcp_port_t *port ));
FORWARD int tcp_setconf ARGS(( tcp_fd_t *tcp_fd ));
FORWARD int tcp_setopt ARGS(( tcp_fd_t *tcp_fd ));
FORWARD int tcp_connect ARGS(( tcp_fd_t *tcp_fd ));
FORWARD int tcp_listen ARGS(( tcp_fd_t *tcp_fd, int do_listenq ));
FORWARD int tcp_acceptto ARGS(( tcp_fd_t *tcp_fd ));
FORWARD tcpport_t find_unused_port ARGS(( int fd ));
FORWARD int is_unused_port ARGS(( Tcpport_t port ));
FORWARD int reply_thr_put ARGS(( tcp_fd_t *tcp_fd, int reply,
int for_ioctl ));
FORWARD void reply_thr_get ARGS(( tcp_fd_t *tcp_fd, int reply,
int for_ioctl ));
FORWARD tcp_conn_t *find_conn_entry ARGS(( Tcpport_t locport,
ipaddr_t locaddr, Tcpport_t remport, ipaddr_t readaddr ));
FORWARD tcp_conn_t *find_empty_conn ARGS(( void ));
FORWARD tcp_conn_t *find_best_conn ARGS(( ip_hdr_t *ip_hdr,
tcp_hdr_t *tcp_hdr ));
FORWARD tcp_conn_t *new_conn_for_queue ARGS(( tcp_fd_t *tcp_fd ));
FORWARD int maybe_listen ARGS(( ipaddr_t locaddr, Tcpport_t locport,
ipaddr_t remaddr, Tcpport_t remport ));
FORWARD int tcp_su4connect ARGS(( tcp_fd_t *tcp_fd ));
FORWARD void tcp_buffree ARGS(( int priority ));
#ifdef BUF_CONSISTENCY_CHECK
FORWARD void tcp_bufcheck ARGS(( void ));
#endif
FORWARD void tcp_setup_conn ARGS(( tcp_port_t *tcp_port,
tcp_conn_t *tcp_conn ));
FORWARD u32_t tcp_rand32 ARGS(( void ));
PUBLIC void tcp_prep()
{
tcp_port_table= alloc(tcp_conf_nr * sizeof(tcp_port_table[0]));
}
PUBLIC void tcp_init()
{
int i, j, k, ifno;
tcp_fd_t *tcp_fd;
tcp_port_t *tcp_port;
tcp_conn_t *tcp_conn;
assert (BUF_S >= sizeof(struct nwio_ipopt));
assert (BUF_S >= sizeof(struct nwio_ipconf));
assert (BUF_S >= sizeof(struct nwio_tcpconf));
assert (BUF_S >= IP_MAX_HDR_SIZE + TCP_MAX_HDR_SIZE);
for (i=0, tcp_fd= tcp_fd_table; i<TCP_FD_NR; i++, tcp_fd++)
{
tcp_fd->tf_flags= TFF_EMPTY;
}
for (i=0, tcp_conn= tcp_conn_table; i<TCP_CONN_NR; i++,
tcp_fd++)
{
tcp_conn->tc_flags= TCF_EMPTY;
tcp_conn->tc_busy= 0;
}
#ifndef BUF_CONSISTENCY_CHECK
bf_logon(tcp_buffree);
#else
bf_logon(tcp_buffree, tcp_bufcheck);
#endif
for (i=0, tcp_port= tcp_port_table; i<tcp_conf_nr; i++, tcp_port++)
{
tcp_port->tp_ipdev= tcp_conf[i].tc_port;
tcp_port->tp_flags= TPF_EMPTY;
tcp_port->tp_state= TPS_EMPTY;
tcp_port->tp_snd_head= NULL;
tcp_port->tp_snd_tail= NULL;
ev_init(&tcp_port->tp_snd_event);
for (j= 0; j<TCP_CONN_HASH_NR; j++)
{
for (k= 0; k<4; k++)
{
tcp_port->tp_conn_hash[j][k]=
&tcp_conn_table[0];
}
}
ifno= ip_conf[tcp_port->tp_ipdev].ic_ifno;
sr_add_minor(if2minor(ifno, TCP_DEV_OFF),
i, tcp_open, tcp_close, tcp_read,
tcp_write, tcp_ioctl, tcp_cancel, tcp_select);
tcp_main(tcp_port);
}
tcp_cancel_f= tcp_cancel;
}
PRIVATE void tcp_main(tcp_port)
tcp_port_t *tcp_port;
{
int result, i;
tcp_conn_t *tcp_conn;
tcp_fd_t *tcp_fd;
switch (tcp_port->tp_state)
{
case TPS_EMPTY:
tcp_port->tp_state= TPS_SETPROTO;
tcp_port->tp_ipfd= ip_open(tcp_port->tp_ipdev,
tcp_port->tp_ipdev, tcp_get_data,
tcp_put_data, tcp_put_pkt, 0 /* no select_res */);
if (tcp_port->tp_ipfd < 0)
{
tcp_port->tp_state= TPS_ERROR;
DBLOCK(1, printf("%s, %d: unable to open ip port\n",
__FILE__, __LINE__));
return;
}
result= ip_ioctl(tcp_port->tp_ipfd, NWIOSIPOPT);
if (result == NW_SUSPEND)
tcp_port->tp_flags |= TPF_SUSPEND;
if (result < 0)
{
return;
}
if (tcp_port->tp_state != TPS_GETCONF)
return;
/* drops through */
case TPS_GETCONF:
tcp_port->tp_flags &= ~TPF_SUSPEND;
result= ip_ioctl(tcp_port->tp_ipfd, NWIOGIPCONF);
if (result == NW_SUSPEND)
tcp_port->tp_flags |= TPF_SUSPEND;
if (result < 0)
{
return;
}
if (tcp_port->tp_state != TPS_MAIN)
return;
/* drops through */
case TPS_MAIN:
tcp_port->tp_flags &= ~TPF_SUSPEND;
tcp_port->tp_pack= 0;
tcp_conn= &tcp_conn_table[tcp_port->tp_ipdev];
tcp_conn->tc_flags= TCF_INUSE;
assert(!tcp_conn->tc_busy);
tcp_conn->tc_locport= 0;
tcp_conn->tc_locaddr= tcp_port->tp_ipaddr;
tcp_conn->tc_remport= 0;
tcp_conn->tc_remaddr= 0;
tcp_conn->tc_state= TCS_CLOSED;
tcp_conn->tc_fd= 0;
tcp_conn->tc_connInprogress= 0;
tcp_conn->tc_orglisten= FALSE;
tcp_conn->tc_senddis= 0;
tcp_conn->tc_ISS= 0;
tcp_conn->tc_SND_UNA= tcp_conn->tc_ISS;
tcp_conn->tc_SND_TRM= tcp_conn->tc_ISS;
tcp_conn->tc_SND_NXT= tcp_conn->tc_ISS;
tcp_conn->tc_SND_UP= tcp_conn->tc_ISS;
tcp_conn->tc_IRS= 0;
tcp_conn->tc_RCV_LO= tcp_conn->tc_IRS;
tcp_conn->tc_RCV_NXT= tcp_conn->tc_IRS;
tcp_conn->tc_RCV_HI= tcp_conn->tc_IRS;
tcp_conn->tc_RCV_UP= tcp_conn->tc_IRS;
tcp_conn->tc_port= tcp_port;
tcp_conn->tc_rcvd_data= NULL;
tcp_conn->tc_adv_data= NULL;
tcp_conn->tc_send_data= 0;
tcp_conn->tc_remipopt= NULL;
tcp_conn->tc_tcpopt= NULL;
tcp_conn->tc_frag2send= 0;
tcp_conn->tc_tos= TCP_DEF_TOS;
tcp_conn->tc_ttl= IP_MAX_TTL;
tcp_conn->tc_rcv_wnd= TCP_MAX_RCV_WND_SIZE;
tcp_conn->tc_rt_dead= TCP_DEF_RT_DEAD;
tcp_conn->tc_stt= 0;
tcp_conn->tc_0wnd_to= 0;
tcp_conn->tc_artt= TCP_DEF_RTT*TCP_RTT_SCALE;
tcp_conn->tc_drtt= 0;
tcp_conn->tc_rtt= TCP_DEF_RTT;
tcp_conn->tc_max_mtu= tcp_port->tp_mtu;
tcp_conn->tc_mtu= tcp_conn->tc_max_mtu;
tcp_conn->tc_mtutim= 0;
tcp_conn->tc_error= NW_OK;
tcp_conn->tc_snd_wnd= TCP_MAX_SND_WND_SIZE;
tcp_conn->tc_snd_cinc=
(long)TCP_DEF_MSS*TCP_DEF_MSS/TCP_MAX_SND_WND_SIZE+1;
tcp_conn->tc_rt_time= 0;
tcp_conn->tc_rt_seq= 0;
tcp_conn->tc_rt_threshold= tcp_conn->tc_ISS;
for (i=0, tcp_fd= tcp_fd_table; i<TCP_FD_NR; i++,
tcp_fd++)
{
if (!(tcp_fd->tf_flags & TFF_INUSE))
continue;
if (tcp_fd->tf_port != tcp_port)
continue;
if (tcp_fd->tf_flags & TFF_IOC_INIT_SP)
{
tcp_fd->tf_flags &= ~TFF_IOC_INIT_SP;
tcp_ioctl(i, tcp_fd->tf_ioreq);
}
}
read_ip_packets(tcp_port);
return;
default:
ip_panic(( "unknown state" ));
break;
}
}
PRIVATE int tcp_select(fd, operations)
int fd;
unsigned operations;
{
int i;
unsigned resops;
tcp_fd_t *tcp_fd;
tcp_conn_t *tcp_conn;
tcp_fd= &tcp_fd_table[fd];
assert (tcp_fd->tf_flags & TFF_INUSE);
resops= 0;
if (tcp_fd->tf_flags & TFF_LISTENQ)
{
/* Special case for LISTENQ */
if (operations & SR_SELECT_READ)
{
for (i= 0; i<TFL_LISTEN_MAX; i++)
{
if (tcp_fd->tf_listenq[i] == NULL)
continue;
if (tcp_fd->tf_listenq[i]->tc_connInprogress
== 0)
{
break;
}
}
if (i >= TFL_LISTEN_MAX)
tcp_fd->tf_flags |= TFF_SEL_READ;
else
resops |= SR_SELECT_READ;
}
if (operations & SR_SELECT_WRITE)
return ENOTCONN; /* Is this right? */
return resops;
}
if (operations & SR_SELECT_READ)
{
if (!(tcp_fd->tf_flags & TFF_CONNECTEDx))
return ENOTCONN; /* Is this right? */
tcp_conn= tcp_fd->tf_conn;
if (tcp_conn->tc_state == TCS_CLOSED || tcp_sel_read(tcp_conn))
resops |= SR_SELECT_READ;
else if (!(operations & SR_SELECT_POLL))
tcp_fd->tf_flags |= TFF_SEL_READ;
}
if (operations & SR_SELECT_WRITE)
{
if (!(tcp_fd->tf_flags & TFF_CONNECTEDx))
return ENOTCONN; /* Is this right? */
tcp_conn= tcp_fd->tf_conn;
if (tcp_conn->tc_state == TCS_CLOSED ||
tcp_conn->tc_flags & TCF_FIN_SENT ||
tcp_sel_write(tcp_conn))
{
resops |= SR_SELECT_WRITE;
}
else if (!(operations & SR_SELECT_POLL))
tcp_fd->tf_flags |= TFF_SEL_WRITE;
}
if (operations & SR_SELECT_EXCEPTION)
{
printf("tcp_select: not implemented for exceptions\n");
}
return resops;
}
PRIVATE acc_t *tcp_get_data (port, offset, count, for_ioctl)
int port;
size_t offset;
size_t count;
int for_ioctl;
{
tcp_port_t *tcp_port;
int result;
tcp_port= &tcp_port_table[port];
switch (tcp_port->tp_state)
{
case TPS_SETPROTO:
if (!count)
{
result= (int)offset;
if (result<0)
{
tcp_port->tp_state= TPS_ERROR;
break;
}
tcp_port->tp_state= TPS_GETCONF;
if (tcp_port->tp_flags & TPF_SUSPEND)
tcp_main(tcp_port);
return NW_OK;
}
assert (!offset);
assert (count == sizeof(struct nwio_ipopt));
{
struct nwio_ipopt *ipopt;
acc_t *acc;
acc= bf_memreq(sizeof(*ipopt));
ipopt= (struct nwio_ipopt *)ptr2acc_data(acc);
ipopt->nwio_flags= NWIO_COPY |
NWIO_EN_LOC | NWIO_DI_BROAD |
NWIO_REMANY | NWIO_PROTOSPEC |
NWIO_HDR_O_ANY | NWIO_RWDATALL;
ipopt->nwio_proto= IPPROTO_TCP;
return acc;
}
case TPS_MAIN:
assert(tcp_port->tp_flags & TPF_WRITE_IP);
if (!count)
{
result= (int)offset;
if (result<0)
{
if (result == EDSTNOTRCH)
{
if (tcp_port->tp_snd_head)
{
tcp_notreach(tcp_port->
tp_snd_head);
}
}
else
{
ip_warning((
"ip_write failed with error: %d\n",
result ));
}
}
assert (tcp_port->tp_pack);
bf_afree (tcp_port->tp_pack);
tcp_port->tp_pack= 0;
if (tcp_port->tp_flags & TPF_WRITE_SP)
{
tcp_port->tp_flags &= ~(TPF_WRITE_SP|
TPF_WRITE_IP);
if (tcp_port->tp_snd_head)
tcp_port_write(tcp_port);
}
else
tcp_port->tp_flags &= ~TPF_WRITE_IP;
}
else
{
return bf_cut (tcp_port->tp_pack, offset,
count);
}
break;
default:
printf("tcp_get_data(%d, 0x%x, 0x%x) called but tp_state= 0x%x\n",
port, offset, count, tcp_port->tp_state);
break;
}
return NW_OK;
}
PRIVATE int tcp_put_data (fd, offset, data, for_ioctl)
int fd;
size_t offset;
acc_t *data;
int for_ioctl;
{
tcp_port_t *tcp_port;
int result;
tcp_port= &tcp_port_table[fd];
switch (tcp_port->tp_state)
{
case TPS_GETCONF:
if (!data)
{
result= (int)offset;
if (result<0)
{
tcp_port->tp_state= TPS_ERROR;
return NW_OK;
}
tcp_port->tp_state= TPS_MAIN;
if (tcp_port->tp_flags & TPF_SUSPEND)
tcp_main(tcp_port);
}
else
{
struct nwio_ipconf *ipconf;
data= bf_packIffLess(data, sizeof(*ipconf));
ipconf= (struct nwio_ipconf *)ptr2acc_data(data);
assert (ipconf->nwic_flags & NWIC_IPADDR_SET);
tcp_port->tp_ipaddr= ipconf->nwic_ipaddr;
tcp_port->tp_subnetmask= ipconf->nwic_netmask;
tcp_port->tp_mtu= ipconf->nwic_mtu;
bf_afree(data);
}
break;
case TPS_MAIN:
assert(tcp_port->tp_flags & TPF_READ_IP);
if (!data)
{
result= (int)offset;
if (result<0)
ip_panic(( "ip_read() failed" ));
if (tcp_port->tp_flags & TPF_READ_SP)
{
tcp_port->tp_flags &= ~(TPF_READ_SP|
TPF_READ_IP);
read_ip_packets(tcp_port);
}
else
tcp_port->tp_flags &= ~TPF_READ_IP;
}
else
{
assert(!offset);
/* this is an invalid assertion but ip sends
* only whole datagrams up */
tcp_put_pkt(fd, data, bf_bufsize(data));
}
break;
default:
printf(
"tcp_put_data(%d, 0x%x, %p) called but tp_state= 0x%x\n",
fd, offset, data, tcp_port->tp_state);
break;
}
return NW_OK;
}
/*
tcp_put_pkt
*/
PRIVATE void tcp_put_pkt(fd, data, datalen)
int fd;
acc_t *data;
size_t datalen;
{
tcp_port_t *tcp_port;
tcp_conn_t *tcp_conn, **conn_p;
ip_hdr_t *ip_hdr;
tcp_hdr_t *tcp_hdr;
acc_t *ip_pack, *tcp_pack;
size_t ip_datalen, tcp_datalen, ip_hdr_len, tcp_hdr_len;
u16_t sum, mtu;
u32_t bits;
int i, hash;
ipaddr_t srcaddr, dstaddr, ipaddr, mask;
tcpport_t srcport, dstport;
tcp_port= &tcp_port_table[fd];
/* Extract the IP header. */
ip_hdr= (ip_hdr_t *)ptr2acc_data(data);
ip_hdr_len= (ip_hdr->ih_vers_ihl & IH_IHL_MASK) << 2;
ip_datalen= datalen - ip_hdr_len;
if (ip_datalen == 0)
{
if (ip_hdr->ih_proto == 0)
{
/* IP layer reports new IP address */
ipaddr= ip_hdr->ih_src;
mask= ip_hdr->ih_dst;
mtu= ntohs(ip_hdr->ih_length);
tcp_port->tp_ipaddr= ipaddr;
tcp_port->tp_subnetmask= mask;
tcp_port->tp_mtu= mtu;
DBLOCK(1, printf("tcp_put_pkt: using address ");
writeIpAddr(ipaddr);
printf(", netmask ");
writeIpAddr(mask);
printf(", mtu %u\n", mtu));
for (i= 0, tcp_conn= tcp_conn_table+i;
i<TCP_CONN_NR; i++, tcp_conn++)
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
if (tcp_conn->tc_port != tcp_port)
continue;
tcp_conn->tc_locaddr= ipaddr;
}
}
else
DBLOCK(1, printf("tcp_put_pkt: no TCP header\n"));
bf_afree(data);
return;
}
data->acc_linkC++;
ip_pack= data;
ip_pack= bf_align(ip_pack, ip_hdr_len, 4);
ip_hdr= (ip_hdr_t *)ptr2acc_data(ip_pack);
data= bf_delhead(data, ip_hdr_len);
/* Compute the checksum */
sum= tcp_pack_oneCsum(ip_hdr, data);
/* Extract the TCP header */
if (ip_datalen < TCP_MIN_HDR_SIZE)
{
DBLOCK(1, printf("truncated TCP header\n"));
bf_afree(ip_pack);
bf_afree(data);
return;
}
data= bf_packIffLess(data, TCP_MIN_HDR_SIZE);
tcp_hdr= (tcp_hdr_t *)ptr2acc_data(data);
tcp_hdr_len= (tcp_hdr->th_data_off & TH_DO_MASK) >> 2;
/* actualy (>> 4) << 2 */
if (ip_datalen < tcp_hdr_len || tcp_hdr_len < TCP_MIN_HDR_SIZE)
{
if (tcp_hdr_len < TCP_MIN_HDR_SIZE)
{
DBLOCK(1, printf("strange tcp header length %d\n",
tcp_hdr_len));
}
else
{
DBLOCK(1, printf("truncated TCP header\n"));
}
bf_afree(ip_pack);
bf_afree(data);
return;
}
data->acc_linkC++;
tcp_pack= data;
tcp_pack= bf_align(tcp_pack, tcp_hdr_len, 4);
tcp_hdr= (tcp_hdr_t *)ptr2acc_data(tcp_pack);
if (ip_datalen == tcp_hdr_len)
{
bf_afree(data);
data= NULL;
}
else
data= bf_delhead(data, tcp_hdr_len);
tcp_datalen= ip_datalen-tcp_hdr_len;
if ((u16_t)~sum)
{
DBLOCK(1, printf("checksum error in tcp packet\n");
printf("tcp_pack_oneCsum(...)= 0x%x length= %d\n",
(u16_t)~sum, tcp_datalen);
printf("src ip_addr= "); writeIpAddr(ip_hdr->ih_src);
printf("\n"));
bf_afree(ip_pack);
bf_afree(tcp_pack);
bf_afree(data);
return;
}
srcaddr= ip_hdr->ih_src;
dstaddr= ip_hdr->ih_dst;
srcport= tcp_hdr->th_srcport;
dstport= tcp_hdr->th_dstport;
bits= srcaddr ^ dstaddr ^ srcport ^ dstport;
bits= (bits >> 16) ^ bits;
bits= (bits >> 8) ^ bits;
hash= ((bits >> TCP_CONN_HASH_SHIFT) ^ bits) & (TCP_CONN_HASH_NR-1);
conn_p= tcp_port->tp_conn_hash[hash];
if (conn_p[0]->tc_locport == dstport &&
conn_p[0]->tc_remport == srcport &&
conn_p[0]->tc_remaddr == srcaddr &&
conn_p[0]->tc_locaddr == dstaddr)
{
tcp_conn= conn_p[0];
}
else if (conn_p[1]->tc_locport == dstport &&
conn_p[1]->tc_remport == srcport &&
conn_p[1]->tc_remaddr == srcaddr &&
conn_p[1]->tc_locaddr == dstaddr)
{
tcp_conn= conn_p[1];
conn_p[1]= conn_p[0];
conn_p[0]= tcp_conn;
}
else if (conn_p[2]->tc_locport == dstport &&
conn_p[2]->tc_remport == srcport &&
conn_p[2]->tc_remaddr == srcaddr &&
conn_p[2]->tc_locaddr == dstaddr)
{
tcp_conn= conn_p[2];
conn_p[2]= conn_p[1];
conn_p[1]= conn_p[0];
conn_p[0]= tcp_conn;
}
else if (conn_p[3]->tc_locport == dstport &&
conn_p[3]->tc_remport == srcport &&
conn_p[3]->tc_remaddr == srcaddr &&
conn_p[3]->tc_locaddr == dstaddr)
{
tcp_conn= conn_p[3];
conn_p[3]= conn_p[2];
conn_p[2]= conn_p[1];
conn_p[1]= conn_p[0];
conn_p[0]= tcp_conn;
}
else
tcp_conn= NULL;
if ((tcp_conn != NULL && tcp_conn->tc_state == TCS_CLOSED) ||
(tcp_hdr->th_flags & THF_SYN))
{
tcp_conn= NULL;
}
if (tcp_conn == NULL)
{
tcp_conn= find_best_conn(ip_hdr, tcp_hdr);
if (!tcp_conn)
{
/* listen backlog hack */
bf_afree(ip_pack);
bf_afree(tcp_pack);
bf_afree(data);
return;
}
if (tcp_conn->tc_state != TCS_CLOSED)
{
conn_p[3]= conn_p[2];
conn_p[2]= conn_p[1];
conn_p[1]= conn_p[0];
conn_p[0]= tcp_conn;
}
}
assert(tcp_conn->tc_busy == 0);
tcp_conn->tc_busy++;
tcp_frag2conn(tcp_conn, ip_hdr, tcp_hdr, data, tcp_datalen);
tcp_conn->tc_busy--;
bf_afree(ip_pack);
bf_afree(tcp_pack);
}
PUBLIC int tcp_open (port, srfd, get_userdata, put_userdata, put_pkt,
select_res)
int port;
int srfd;
get_userdata_t get_userdata;
put_userdata_t put_userdata;
put_pkt_t put_pkt;
select_res_t select_res;
{
int i, j;
tcp_fd_t *tcp_fd;
for (i=0; i<TCP_FD_NR && (tcp_fd_table[i].tf_flags & TFF_INUSE);
i++);
if (i>=TCP_FD_NR)
{
return EAGAIN;
}
tcp_fd= &tcp_fd_table[i];
tcp_fd->tf_flags= TFF_INUSE;
tcp_fd->tf_flags |= TFF_PUSH_DATA;
tcp_fd->tf_port= &tcp_port_table[port];
tcp_fd->tf_srfd= srfd;
tcp_fd->tf_tcpconf.nwtc_flags= TCP_DEF_CONF;
tcp_fd->tf_tcpconf.nwtc_remaddr= 0;
tcp_fd->tf_tcpconf.nwtc_remport= 0;
tcp_fd->tf_tcpopt.nwto_flags= TCP_DEF_OPT;
tcp_fd->tf_get_userdata= get_userdata;
tcp_fd->tf_put_userdata= put_userdata;
tcp_fd->tf_select_res= select_res;
tcp_fd->tf_conn= 0;
for (j= 0; j<TFL_LISTEN_MAX; j++)
tcp_fd->tf_listenq[j]= NULL;
return i;
}
/*
tcp_ioctl
*/
PUBLIC int tcp_ioctl (fd, req)
int fd;
ioreq_t req;
{
tcp_fd_t *tcp_fd;
tcp_port_t *tcp_port;
tcp_conn_t *tcp_conn;
nwio_tcpconf_t *tcp_conf;
nwio_tcpopt_t *tcp_opt;
tcp_cookie_t *cookiep;
acc_t *acc, *conf_acc, *opt_acc;
int result, *bytesp;
u8_t rndbits[RAND256_BUFSIZE];
tcp_fd= &tcp_fd_table[fd];
assert (tcp_fd->tf_flags & TFF_INUSE);
tcp_port= tcp_fd->tf_port;
tcp_fd->tf_flags |= TFF_IOCTL_IP;
tcp_fd->tf_ioreq= req;
if (tcp_port->tp_state != TPS_MAIN)
{
tcp_fd->tf_flags |= TFF_IOC_INIT_SP;
return NW_SUSPEND;
}
switch (req)
{
case NWIOSTCPCONF:
if ((tcp_fd->tf_flags & TFF_CONNECTEDx) ||
(tcp_fd->tf_flags & TFF_CONNECTING) ||
(tcp_fd->tf_flags & TFF_LISTENQ))
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, EISCONN, TRUE);
result= NW_OK;
break;
}
result= tcp_setconf(tcp_fd);
break;
case NWIOGTCPCONF:
conf_acc= bf_memreq(sizeof(*tcp_conf));
assert (conf_acc->acc_length == sizeof(*tcp_conf));
tcp_conf= (nwio_tcpconf_t *)ptr2acc_data(conf_acc);
*tcp_conf= tcp_fd->tf_tcpconf;
if (tcp_fd->tf_flags & TFF_CONNECTEDx)
{
tcp_conn= tcp_fd->tf_conn;
tcp_conf->nwtc_locport= tcp_conn->tc_locport;
tcp_conf->nwtc_remaddr= tcp_conn->tc_remaddr;
tcp_conf->nwtc_remport= tcp_conn->tc_remport;
}
tcp_conf->nwtc_locaddr= tcp_fd->tf_port->tp_ipaddr;
result= (*tcp_fd->tf_put_userdata)(tcp_fd->tf_srfd,
0, conf_acc, TRUE);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_put(tcp_fd, result, TRUE);
result= NW_OK;
break;
case NWIOSTCPOPT:
result= tcp_setopt(tcp_fd);
break;
case NWIOGTCPOPT:
opt_acc= bf_memreq(sizeof(*tcp_opt));
assert (opt_acc->acc_length == sizeof(*tcp_opt));
tcp_opt= (nwio_tcpopt_t *)ptr2acc_data(opt_acc);
*tcp_opt= tcp_fd->tf_tcpopt;
result= (*tcp_fd->tf_put_userdata)(tcp_fd->tf_srfd,
0, opt_acc, TRUE);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_put(tcp_fd, result, TRUE);
result= NW_OK;
break;
case NWIOTCPCONN:
if (tcp_fd->tf_flags & TFF_CONNECTING)
assert(NOT_IMPLEMENTED);
if (tcp_fd->tf_flags & TFF_CONNECTEDx)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, EISCONN, TRUE);
result= NW_OK;
break;
}
result= tcp_connect(tcp_fd);
break;
case NWIOTCPLISTEN:
case NWIOTCPLISTENQ:
if ((tcp_fd->tf_flags & TFF_CONNECTEDx) ||
(tcp_fd->tf_flags & TFF_LISTENQ) ||
(tcp_fd->tf_flags & TFF_CONNECTING))
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, EISCONN, TRUE);
result= NW_OK;
break;
}
result= tcp_listen(tcp_fd, (req == NWIOTCPLISTENQ));
break;
case NWIOTCPSHUTDOWN:
if (!(tcp_fd->tf_flags & TFF_CONNECTEDx))
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, ENOTCONN, TRUE);
result= NW_OK;
break;
}
tcp_fd->tf_flags |= TFF_IOCTL_IP;
tcp_fd->tf_ioreq= req;
tcp_conn= tcp_fd->tf_conn;
tcp_conn->tc_busy++;
tcp_fd_write(tcp_conn);
tcp_conn->tc_busy--;
tcp_conn_write(tcp_conn, 0);
if (!(tcp_fd->tf_flags & TFF_IOCTL_IP))
result= NW_OK;
else
result= NW_SUSPEND;
break;
case NWIOTCPPUSH:
if (!(tcp_fd->tf_flags & TFF_CONNECTEDx))
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, ENOTCONN, TRUE);
result= NW_OK;
break;
}
tcp_conn= tcp_fd->tf_conn;
tcp_conn->tc_SND_PSH= tcp_conn->tc_SND_NXT;
tcp_conn->tc_flags &= ~TCF_NO_PUSH;
tcp_conn->tc_flags |= TCF_PUSH_NOW;
/* Start the timer (if necessary) */
if (tcp_conn->tc_SND_TRM == tcp_conn->tc_SND_UNA)
tcp_set_send_timer(tcp_conn);
tcp_conn_write(tcp_conn, 0);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, NW_OK, TRUE);
result= NW_OK;
break;
case NWIOGTCPCOOKIE:
printf("NWIOGTCPCOOKIE request for fd %d\n", fd);
if (!(tcp_fd->tf_flags & TFF_COOKIE))
{
tcp_fd->tf_cookie.tc_ref= fd;
rand256(rndbits);
assert(sizeof(tcp_fd->tf_cookie.tc_secret) <=
RAND256_BUFSIZE);
memcpy(tcp_fd->tf_cookie.tc_secret,
rndbits, sizeof(tcp_fd->tf_cookie.tc_secret));
tcp_fd->tf_flags |= TFF_COOKIE;
}
acc= bf_memreq(sizeof(*cookiep));
cookiep= (tcp_cookie_t *)ptr2acc_data(acc);
*cookiep= tcp_fd->tf_cookie;
result= (*tcp_fd->tf_put_userdata)(tcp_fd->tf_srfd,
0, acc, TRUE);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_put(tcp_fd, result, TRUE);
result= NW_OK;
break;
case NWIOTCPACCEPTTO:
result= tcp_acceptto(tcp_fd);
break;
case FIONREAD:
acc= bf_memreq(sizeof(*bytesp));
bytesp= (int *)ptr2acc_data(acc);
tcp_bytesavailable(tcp_fd, bytesp);
result= (*tcp_fd->tf_put_userdata)(tcp_fd->tf_srfd,
0, acc, TRUE);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_put(tcp_fd, result, TRUE);
result= NW_OK;
break;
default:
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADIOCTL, TRUE);
result= NW_OK;
break;
}
return result;
}
/*
tcp_setconf
*/
PRIVATE int tcp_setconf(tcp_fd)
tcp_fd_t *tcp_fd;
{
nwio_tcpconf_t *tcpconf;
nwio_tcpconf_t oldconf, newconf;
acc_t *data;
tcp_fd_t *fd_ptr;
unsigned int new_en_flags, new_di_flags,
old_en_flags, old_di_flags, all_flags, flags;
int i;
data= (*tcp_fd->tf_get_userdata)
(tcp_fd->tf_srfd, 0,
sizeof(nwio_tcpconf_t), TRUE);
if (!data)
return EFAULT;
data= bf_packIffLess(data, sizeof(nwio_tcpconf_t));
assert (data->acc_length == sizeof(nwio_tcpconf_t));
tcpconf= (nwio_tcpconf_t *)ptr2acc_data(data);
oldconf= tcp_fd->tf_tcpconf;
newconf= *tcpconf;
old_en_flags= oldconf.nwtc_flags & 0xffff;
old_di_flags= (oldconf.nwtc_flags >> 16) &
0xffff;
new_en_flags= newconf.nwtc_flags & 0xffff;
new_di_flags= (newconf.nwtc_flags >> 16) &
0xffff;
if (new_en_flags & new_di_flags)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
bf_afree(data);
return NW_OK;
}
/* NWTC_ACC_MASK */
if (new_di_flags & NWTC_ACC_MASK)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
bf_afree(data);
return NW_OK;
/* access modes can't be disabled */
}
if (!(new_en_flags & NWTC_ACC_MASK))
new_en_flags |= (old_en_flags & NWTC_ACC_MASK);
/* NWTC_LOCPORT_MASK */
if (new_di_flags & NWTC_LOCPORT_MASK)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
bf_afree(data);
return NW_OK;
/* the loc ports can't be disabled */
}
if (!(new_en_flags & NWTC_LOCPORT_MASK))
{
new_en_flags |= (old_en_flags &
NWTC_LOCPORT_MASK);
newconf.nwtc_locport= oldconf.nwtc_locport;
}
else if ((new_en_flags & NWTC_LOCPORT_MASK) == NWTC_LP_SEL)
{
newconf.nwtc_locport= find_unused_port(tcp_fd-
tcp_fd_table);
}
else if ((new_en_flags & NWTC_LOCPORT_MASK) == NWTC_LP_SET)
{
if (!newconf.nwtc_locport)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
bf_afree(data);
return NW_OK;
}
}
/* NWTC_REMADDR_MASK */
if (!((new_en_flags | new_di_flags) &
NWTC_REMADDR_MASK))
{
new_en_flags |= (old_en_flags &
NWTC_REMADDR_MASK);
new_di_flags |= (old_di_flags &
NWTC_REMADDR_MASK);
newconf.nwtc_remaddr= oldconf.nwtc_remaddr;
}
else if (new_en_flags & NWTC_SET_RA)
{
if (!newconf.nwtc_remaddr)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
bf_afree(data);
return NW_OK;
}
}
else
{
assert (new_di_flags & NWTC_REMADDR_MASK);
newconf.nwtc_remaddr= 0;
}
/* NWTC_REMPORT_MASK */
if (!((new_en_flags | new_di_flags) & NWTC_REMPORT_MASK))
{
new_en_flags |= (old_en_flags &
NWTC_REMPORT_MASK);
new_di_flags |= (old_di_flags &
NWTC_REMPORT_MASK);
newconf.nwtc_remport=
oldconf.nwtc_remport;
}
else if (new_en_flags & NWTC_SET_RP)
{
if (!newconf.nwtc_remport)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
bf_afree(data);
return NW_OK;
}
}
else
{
assert (new_di_flags & NWTC_REMPORT_MASK);
newconf.nwtc_remport= 0;
}
newconf.nwtc_flags= ((unsigned long)new_di_flags
<< 16) | new_en_flags;
all_flags= new_en_flags | new_di_flags;
/* check the access modes */
if ((all_flags & NWTC_LOCPORT_MASK) != NWTC_LP_UNSET)
{
for (i=0, fd_ptr= tcp_fd_table; i<TCP_FD_NR; i++, fd_ptr++)
{
if (fd_ptr == tcp_fd)
continue;
if (!(fd_ptr->tf_flags & TFF_INUSE))
continue;
if (fd_ptr->tf_port != tcp_fd->tf_port)
continue;
flags= fd_ptr->tf_tcpconf.nwtc_flags;
if ((flags & NWTC_LOCPORT_MASK) == NWTC_LP_UNSET)
continue;
if (fd_ptr->tf_tcpconf.nwtc_locport !=
newconf.nwtc_locport)
continue;
if ((flags & NWTC_ACC_MASK) != (all_flags &
NWTC_ACC_MASK) ||
(all_flags & NWTC_ACC_MASK) == NWTC_EXCL)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EADDRINUSE, TRUE);
bf_afree(data);
return NW_OK;
}
}
}
tcp_fd->tf_tcpconf= newconf;
if ((all_flags & NWTC_ACC_MASK) &&
((all_flags & NWTC_LOCPORT_MASK) == NWTC_LP_SET ||
(all_flags & NWTC_LOCPORT_MASK) == NWTC_LP_SEL) &&
(all_flags & NWTC_REMADDR_MASK) &&
(all_flags & NWTC_REMPORT_MASK))
tcp_fd->tf_flags |= TFF_CONF_SET;
else
{
tcp_fd->tf_flags &= ~TFF_CONF_SET;
}
bf_afree(data);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, NW_OK, TRUE);
return NW_OK;
}
/*
tcp_setopt
*/
PRIVATE int tcp_setopt(tcp_fd)
tcp_fd_t *tcp_fd;
{
nwio_tcpopt_t *tcpopt;
nwio_tcpopt_t oldopt, newopt;
acc_t *data;
unsigned int new_en_flags, new_di_flags,
old_en_flags, old_di_flags;
data= (*tcp_fd->tf_get_userdata) (tcp_fd->tf_srfd, 0,
sizeof(nwio_tcpopt_t), TRUE);
if (!data)
return EFAULT;
data= bf_packIffLess(data, sizeof(nwio_tcpopt_t));
assert (data->acc_length == sizeof(nwio_tcpopt_t));
tcpopt= (nwio_tcpopt_t *)ptr2acc_data(data);
oldopt= tcp_fd->tf_tcpopt;
newopt= *tcpopt;
old_en_flags= oldopt.nwto_flags & 0xffff;
old_di_flags= (oldopt.nwto_flags >> 16) & 0xffff;
new_en_flags= newopt.nwto_flags & 0xffff;
new_di_flags= (newopt.nwto_flags >> 16) & 0xffff;
if (new_en_flags & new_di_flags)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
return NW_OK;
}
/* NWTO_SND_URG_MASK */
if (!((new_en_flags | new_di_flags) & NWTO_SND_URG_MASK))
{
new_en_flags |= (old_en_flags & NWTO_SND_URG_MASK);
new_di_flags |= (old_di_flags & NWTO_SND_URG_MASK);
}
/* NWTO_RCV_URG_MASK */
if (!((new_en_flags | new_di_flags) & NWTO_RCV_URG_MASK))
{
new_en_flags |= (old_en_flags & NWTO_RCV_URG_MASK);
new_di_flags |= (old_di_flags & NWTO_RCV_URG_MASK);
}
/* NWTO_BSD_URG_MASK */
if (!((new_en_flags | new_di_flags) & NWTO_BSD_URG_MASK))
{
new_en_flags |= (old_en_flags & NWTO_BSD_URG_MASK);
new_di_flags |= (old_di_flags & NWTO_BSD_URG_MASK);
}
else
{
if (tcp_fd->tf_conn == NULL)
{
bf_afree(data);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EINVAL, TRUE);
return NW_OK;
}
}
/* NWTO_DEL_RST_MASK */
if (!((new_en_flags | new_di_flags) & NWTO_DEL_RST_MASK))
{
new_en_flags |= (old_en_flags & NWTO_DEL_RST_MASK);
new_di_flags |= (old_di_flags & NWTO_DEL_RST_MASK);
}
/* NWTO_BULK_MASK */
if (!((new_en_flags | new_di_flags) & NWTO_BULK_MASK))
{
new_en_flags |= (old_en_flags & NWTO_BULK_MASK);
new_di_flags |= (old_di_flags & NWTO_BULK_MASK);
}
newopt.nwto_flags= ((unsigned long)new_di_flags << 16) |
new_en_flags;
tcp_fd->tf_tcpopt= newopt;
if (newopt.nwto_flags & NWTO_SND_URG)
tcp_fd->tf_flags |= TFF_WR_URG;
else
tcp_fd->tf_flags &= ~TFF_WR_URG;
if (newopt.nwto_flags & NWTO_RCV_URG)
tcp_fd->tf_flags |= TFF_RECV_URG;
else
tcp_fd->tf_flags &= ~TFF_RECV_URG;
if (tcp_fd->tf_conn)
{
if (newopt.nwto_flags & NWTO_BSD_URG)
tcp_fd->tf_conn->tc_flags |= TCF_BSD_URG;
else
tcp_fd->tf_conn->tc_flags &= ~TCF_BSD_URG;
}
if (newopt.nwto_flags & NWTO_DEL_RST)
tcp_fd->tf_flags |= TFF_DEL_RST;
else
tcp_fd->tf_flags &= ~TFF_DEL_RST;
if (newopt.nwto_flags & NWTO_BULK)
tcp_fd->tf_flags &= ~TFF_PUSH_DATA;
else
tcp_fd->tf_flags |= TFF_PUSH_DATA;
bf_afree(data);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, NW_OK, TRUE);
return NW_OK;
}
PRIVATE tcpport_t find_unused_port(fd)
int fd;
{
tcpport_t port, nw_port;
for (port= 0x8000+fd; port < 0xffff-TCP_FD_NR; port+= TCP_FD_NR)
{
nw_port= htons(port);
if (is_unused_port(nw_port))
return nw_port;
}
for (port= 0x8000; port < 0xffff; port++)
{
nw_port= htons(port);
if (is_unused_port(nw_port))
return nw_port;
}
ip_panic(( "unable to find unused port (shouldn't occur)" ));
return 0;
}
PRIVATE int is_unused_port(port)
tcpport_t port;
{
int i;
tcp_fd_t *tcp_fd;
tcp_conn_t *tcp_conn;
for (i= 0, tcp_fd= tcp_fd_table; i<TCP_FD_NR; i++,
tcp_fd++)
{
if (!(tcp_fd->tf_flags & TFF_CONF_SET))
continue;
if (tcp_fd->tf_tcpconf.nwtc_locport == port)
return FALSE;
}
for (i= tcp_conf_nr, tcp_conn= tcp_conn_table+i;
i<TCP_CONN_NR; i++, tcp_conn++)
/* the first tcp_conf_nr ports are special */
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
if (tcp_conn->tc_locport == port)
return FALSE;
}
return TRUE;
}
PRIVATE int reply_thr_put(tcp_fd, reply, for_ioctl)
tcp_fd_t *tcp_fd;
int reply;
int for_ioctl;
{
assert (tcp_fd);
return (*tcp_fd->tf_put_userdata)(tcp_fd->tf_srfd, reply,
(acc_t *)0, for_ioctl);
}
PRIVATE void reply_thr_get(tcp_fd, reply, for_ioctl)
tcp_fd_t *tcp_fd;
int reply;
int for_ioctl;
{
acc_t *result;
result= (*tcp_fd->tf_get_userdata)(tcp_fd->tf_srfd, reply,
(size_t)0, for_ioctl);
assert (!result);
}
PUBLIC int tcp_su4listen(tcp_fd, tcp_conn, do_listenq)
tcp_fd_t *tcp_fd;
tcp_conn_t *tcp_conn;
int do_listenq;
{
tcp_conn->tc_locport= tcp_fd->tf_tcpconf.nwtc_locport;
tcp_conn->tc_locaddr= tcp_fd->tf_port->tp_ipaddr;
if (tcp_fd->tf_tcpconf.nwtc_flags & NWTC_SET_RP)
tcp_conn->tc_remport= tcp_fd->tf_tcpconf.nwtc_remport;
else
tcp_conn->tc_remport= 0;
if (tcp_fd->tf_tcpconf.nwtc_flags & NWTC_SET_RA)
tcp_conn->tc_remaddr= tcp_fd->tf_tcpconf.nwtc_remaddr;
else
tcp_conn->tc_remaddr= 0;
tcp_setup_conn(tcp_fd->tf_port, tcp_conn);
tcp_conn->tc_fd= tcp_fd;
tcp_conn->tc_connInprogress= 1;
tcp_conn->tc_orglisten= TRUE;
tcp_conn->tc_state= TCS_LISTEN;
tcp_conn->tc_rt_dead= TCP_DEF_RT_MAX_LISTEN;
if (do_listenq)
{
tcp_fd->tf_flags |= TFF_LISTENQ;
tcp_reply_ioctl(tcp_fd, NW_OK);
return NW_OK;
}
return NW_SUSPEND;
}
/*
find_empty_conn
This function returns a connection that is not inuse.
This includes connections that are never used, and connections without a
user that are not used for a while.
*/
PRIVATE tcp_conn_t *find_empty_conn()
{
int i;
tcp_conn_t *tcp_conn;
for (i=tcp_conf_nr, tcp_conn= tcp_conn_table+i;
i<TCP_CONN_NR; i++, tcp_conn++)
/* the first tcp_conf_nr connections are reserved for
* RSTs
*/
{
if (tcp_conn->tc_flags == TCF_EMPTY)
{
tcp_conn->tc_connInprogress= 0;
tcp_conn->tc_fd= NULL;
return tcp_conn;
}
if (tcp_conn->tc_fd)
continue;
if (tcp_conn->tc_senddis > get_time())
continue;
if (tcp_conn->tc_state != TCS_CLOSED)
{
tcp_close_connection (tcp_conn, ENOCONN);
}
tcp_conn->tc_flags= 0;
return tcp_conn;
}
return NULL;
}
/*
find_conn_entry
This function return a connection matching locport, locaddr, remport, remaddr.
If no such connection exists NULL is returned.
If a connection exists without mainuser it is closed.
*/
PRIVATE tcp_conn_t *find_conn_entry(locport, locaddr, remport, remaddr)
tcpport_t locport;
ipaddr_t locaddr;
tcpport_t remport;
ipaddr_t remaddr;
{
tcp_conn_t *tcp_conn;
int i, state;
assert(remport);
assert(remaddr);
for (i=tcp_conf_nr, tcp_conn= tcp_conn_table+i; i<TCP_CONN_NR;
i++, tcp_conn++)
/* the first tcp_conf_nr connections are reserved for
RSTs */
{
if (tcp_conn->tc_flags == TCF_EMPTY)
continue;
if (tcp_conn->tc_locport != locport ||
tcp_conn->tc_locaddr != locaddr ||
tcp_conn->tc_remport != remport ||
tcp_conn->tc_remaddr != remaddr)
continue;
if (tcp_conn->tc_fd)
return tcp_conn;
state= tcp_conn->tc_state;
if (state != TCS_CLOSED)
{
tcp_close_connection(tcp_conn, ENOCONN);
}
return tcp_conn;
}
return NULL;
}
PRIVATE void read_ip_packets(tcp_port)
tcp_port_t *tcp_port;
{
int result;
do
{
tcp_port->tp_flags |= TPF_READ_IP;
result= ip_read(tcp_port->tp_ipfd, TCP_MAX_DATAGRAM);
if (result == NW_SUSPEND)
{
tcp_port->tp_flags |= TPF_READ_SP;
return;
}
assert(result == NW_OK);
tcp_port->tp_flags &= ~TPF_READ_IP;
} while(!(tcp_port->tp_flags & TPF_READ_IP));
}
/*
find_best_conn
*/
PRIVATE tcp_conn_t *find_best_conn(ip_hdr, tcp_hdr)
ip_hdr_t *ip_hdr;
tcp_hdr_t *tcp_hdr;
{
int best_level, new_level;
tcp_conn_t *best_conn, *listen_conn, *tcp_conn;
tcp_fd_t *tcp_fd;
int i;
ipaddr_t locaddr;
ipaddr_t remaddr;
tcpport_t locport;
tcpport_t remport;
locaddr= ip_hdr->ih_dst;
remaddr= ip_hdr->ih_src;
locport= tcp_hdr->th_dstport;
remport= tcp_hdr->th_srcport;
if (!remport) /* This can interfere with a listen, so we reject it
* by clearing the requested port
*/
locport= 0;
best_level= 0;
best_conn= NULL;
listen_conn= NULL;
for (i= tcp_conf_nr, tcp_conn= tcp_conn_table+i;
i<TCP_CONN_NR; i++, tcp_conn++)
/* the first tcp_conf_nr connections are reserved for
RSTs */
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
/* First fast check for open connections. */
if (tcp_conn->tc_locaddr == locaddr &&
tcp_conn->tc_locport == locport &&
tcp_conn->tc_remport == remport &&
tcp_conn->tc_remaddr == remaddr &&
tcp_conn->tc_fd)
{
return tcp_conn;
}
/* Now check for listens and abandoned connections. */
if (tcp_conn->tc_locaddr != locaddr)
{
continue;
}
new_level= 0;
if (tcp_conn->tc_locport)
{
if (tcp_conn->tc_locport != locport)
{
continue;
}
new_level += 4;
}
if (tcp_conn->tc_remport)
{
if (tcp_conn->tc_remport != remport)
{
continue;
}
new_level += 1;
}
if (tcp_conn->tc_remaddr)
{
if (tcp_conn->tc_remaddr != remaddr)
{
continue;
}
new_level += 2;
}
if (new_level<best_level)
continue;
if (new_level != 7 && tcp_conn->tc_state != TCS_LISTEN)
continue;
if (new_level == 7)
/* We found an abandoned connection */
{
assert(!tcp_conn->tc_fd);
if (best_conn && tcp_Lmod4G(tcp_conn->tc_ISS,
best_conn->tc_ISS))
{
continue;
}
best_conn= tcp_conn;
continue;
}
if (!(tcp_hdr->th_flags & THF_SYN))
continue;
best_level= new_level;
listen_conn= tcp_conn;
assert(listen_conn->tc_fd != NULL);
}
if (listen_conn && listen_conn->tc_fd->tf_flags & TFF_LISTENQ &&
listen_conn->tc_fd->tf_conn == listen_conn)
{
/* Special processing for listen queues. Only accept the
* connection if there is empty space in the queue and
* there are empty connections as well.
*/
listen_conn= new_conn_for_queue(listen_conn->tc_fd);
}
if (!best_conn && !listen_conn)
{
if ((tcp_hdr->th_flags & THF_SYN) &&
maybe_listen(locaddr, locport, remaddr, remport))
{
/* Quick hack to implement listen back logs:
* if a SYN arrives and there is no listen waiting
* for that packet, then no reply is sent.
*/
return NULL;
}
for (i=0, tcp_conn= tcp_conn_table; i<tcp_conf_nr;
i++, tcp_conn++)
{
/* find valid port to send RST */
if ((tcp_conn->tc_flags & TCF_INUSE) &&
tcp_conn->tc_locaddr==locaddr)
{
break;
}
}
assert (tcp_conn);
assert (tcp_conn->tc_state == TCS_CLOSED);
tcp_conn->tc_locport= locport;
tcp_conn->tc_locaddr= locaddr;
tcp_conn->tc_remport= remport;
tcp_conn->tc_remaddr= remaddr;
assert (!tcp_conn->tc_fd);
return tcp_conn;
}
if (best_conn)
{
assert(!best_conn->tc_fd);
if (!listen_conn)
return best_conn;
tcp_fd= listen_conn->tc_fd;
assert(tcp_fd && listen_conn->tc_connInprogress &&
tcp_fd->tf_conn == listen_conn);
if (best_conn->tc_state != TCS_CLOSED)
tcp_close_connection(best_conn, ENOCONN);
listen_conn->tc_ISS= best_conn->tc_ISS;
if (best_conn->tc_senddis > listen_conn->tc_senddis)
listen_conn->tc_senddis= best_conn->tc_senddis;
return listen_conn;
}
assert (listen_conn);
return listen_conn;
}
/*
new_conn_for_queue
*/
PRIVATE tcp_conn_t *new_conn_for_queue(tcp_fd)
tcp_fd_t *tcp_fd;
{
int i;
tcp_conn_t *tcp_conn;
assert(tcp_fd->tf_flags & TFF_LISTENQ);
for (i= 0; i<TFL_LISTEN_MAX; i++)
{
if (tcp_fd->tf_listenq[i] == NULL)
break;
}
if (i >= TFL_LISTEN_MAX)
return NULL;
tcp_conn= find_empty_conn();
if (!tcp_conn)
return NULL;
tcp_fd->tf_listenq[i]= tcp_conn;
(void)tcp_su4listen(tcp_fd, tcp_conn, 0 /* !do_listenq */);
return tcp_conn;
}
/*
maybe_listen
*/
PRIVATE int maybe_listen(locaddr, locport, remaddr, remport)
ipaddr_t locaddr;
tcpport_t locport;
ipaddr_t remaddr;
tcpport_t remport;
{
int i;
tcp_conn_t *tcp_conn;
tcp_fd_t *fd;
for (i= tcp_conf_nr, tcp_conn= tcp_conn_table+i;
i<TCP_CONN_NR; i++, tcp_conn++)
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
if (tcp_conn->tc_locaddr != locaddr)
{
continue;
}
if (tcp_conn->tc_locport != locport )
{
continue;
}
if (!tcp_conn->tc_orglisten)
continue;
fd= tcp_conn->tc_fd;
if (!fd)
continue;
if ((fd->tf_tcpconf.nwtc_flags & NWTC_SET_RP) &&
tcp_conn->tc_remport != remport)
{
continue;
}
if ((fd->tf_tcpconf.nwtc_flags & NWTC_SET_RA) &&
tcp_conn->tc_remaddr != remaddr)
{
continue;
}
if (!(fd->tf_flags & TFF_DEL_RST))
continue;
return 1;
}
return 0;
}
PUBLIC void tcp_reply_ioctl(tcp_fd, reply)
tcp_fd_t *tcp_fd;
int reply;
{
assert (tcp_fd->tf_flags & TFF_IOCTL_IP);
assert (tcp_fd->tf_ioreq == NWIOTCPSHUTDOWN ||
tcp_fd->tf_ioreq == NWIOTCPLISTEN ||
tcp_fd->tf_ioreq == NWIOTCPLISTENQ ||
tcp_fd->tf_ioreq == NWIOTCPACCEPTTO ||
tcp_fd->tf_ioreq == NWIOTCPCONN);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, reply, TRUE);
}
PUBLIC void tcp_reply_write(tcp_fd, reply)
tcp_fd_t *tcp_fd;
size_t reply;
{
assert (tcp_fd->tf_flags & TFF_WRITE_IP);
tcp_fd->tf_flags &= ~TFF_WRITE_IP;
reply_thr_get (tcp_fd, reply, FALSE);
}
PUBLIC void tcp_reply_read(tcp_fd, reply)
tcp_fd_t *tcp_fd;
size_t reply;
{
assert (tcp_fd->tf_flags & TFF_READ_IP);
tcp_fd->tf_flags &= ~TFF_READ_IP;
reply_thr_put (tcp_fd, reply, FALSE);
}
PUBLIC int tcp_write(fd, count)
int fd;
size_t count;
{
tcp_fd_t *tcp_fd;
tcp_conn_t *tcp_conn;
tcp_fd= &tcp_fd_table[fd];
assert (tcp_fd->tf_flags & TFF_INUSE);
if (!(tcp_fd->tf_flags & TFF_CONNECTEDx))
{
reply_thr_get (tcp_fd, ENOTCONN, FALSE);
return NW_OK;
}
tcp_conn= tcp_fd->tf_conn;
if (tcp_conn->tc_state == TCS_CLOSED)
{
reply_thr_get(tcp_fd, tcp_conn->tc_error, FALSE);
return NW_OK;
}
if (tcp_conn->tc_flags & TCF_FIN_SENT)
{
reply_thr_get (tcp_fd, ESHUTDOWN, FALSE);
return NW_OK;
}
tcp_fd->tf_flags |= TFF_WRITE_IP;
tcp_fd->tf_write_offset= 0;
tcp_fd->tf_write_count= count;
/* New data may cause a segment to be sent. Clear PUSH_NOW
* from last NWIOTCPPUSH ioctl.
*/
tcp_conn->tc_flags &= ~(TCF_NO_PUSH|TCF_PUSH_NOW);
/* Start the timer (if necessary) */
if (tcp_conn->tc_SND_TRM == tcp_conn->tc_SND_UNA)
tcp_set_send_timer(tcp_conn);
assert(tcp_conn->tc_busy == 0);
tcp_conn->tc_busy++;
tcp_fd_write(tcp_conn);
tcp_conn->tc_busy--;
tcp_conn_write(tcp_conn, 0);
if (!(tcp_fd->tf_flags & TFF_WRITE_IP))
return NW_OK;
else
return NW_SUSPEND;
}
PUBLIC int
tcp_read(fd, count)
int fd;
size_t count;
{
tcp_fd_t *tcp_fd;
tcp_conn_t *tcp_conn;
tcp_fd= &tcp_fd_table[fd];
assert (tcp_fd->tf_flags & TFF_INUSE);
if (!(tcp_fd->tf_flags & TFF_CONNECTEDx))
{
reply_thr_put (tcp_fd, ENOTCONN, FALSE);
return NW_OK;
}
tcp_conn= tcp_fd->tf_conn;
tcp_fd->tf_flags |= TFF_READ_IP;
tcp_fd->tf_read_offset= 0;
tcp_fd->tf_read_count= count;
assert(tcp_conn->tc_busy == 0);
tcp_conn->tc_busy++;
tcp_fd_read(tcp_conn, 0);
tcp_conn->tc_busy--;
if (!(tcp_fd->tf_flags & TFF_READ_IP))
return NW_OK;
else
return NW_SUSPEND;
}
/*
tcp_restart_connect
reply the success or failure of a connect to the user.
*/
PUBLIC void tcp_restart_connect(tcp_conn)
tcp_conn_t *tcp_conn;
{
tcp_fd_t *tcp_fd;
int reply;
assert(tcp_conn->tc_connInprogress);
tcp_conn->tc_connInprogress= 0;
tcp_fd= tcp_conn->tc_fd;
assert(tcp_fd);
if (tcp_fd->tf_flags & TFF_LISTENQ)
{
/* Special code for listen queues */
if (tcp_conn->tc_state == TCS_CLOSED)
{
assert(NOT_IMPLEMENTED);
reply= tcp_conn->tc_error;
tcp_conn->tc_fd= NULL;
}
/* Reply for select */
if ((tcp_fd->tf_flags & TFF_SEL_READ) &&
tcp_fd->tf_select_res)
{
tcp_fd->tf_flags &= ~TFF_SEL_READ;
tcp_fd->tf_select_res(tcp_fd->tf_srfd,
SR_SELECT_READ);
}
/* Reply for acceptto */
if (tcp_fd->tf_flags & TFF_IOCTL_IP)
(void) tcp_acceptto(tcp_fd);
return;
}
assert(tcp_fd->tf_flags & TFF_IOCTL_IP);
assert(tcp_fd->tf_ioreq == NWIOTCPLISTEN ||
tcp_fd->tf_ioreq == NWIOTCPCONN);
if (tcp_conn->tc_state == TCS_CLOSED)
{
reply= tcp_conn->tc_error;
assert(tcp_conn->tc_fd == tcp_fd);
tcp_fd->tf_conn= NULL;
tcp_conn->tc_fd= NULL;
}
else
{
tcp_fd->tf_flags |= TFF_CONNECTEDx;
reply= NW_OK;
}
tcp_reply_ioctl (tcp_fd, reply);
}
/*
tcp_close
*/
PUBLIC void tcp_close(fd)
int fd;
{
int i;
tcp_fd_t *tcp_fd;
tcp_conn_t *tcp_conn;
tcp_fd= &tcp_fd_table[fd];
assert (tcp_fd->tf_flags & TFF_INUSE);
assert (!(tcp_fd->tf_flags &
(TFF_IOCTL_IP|TFF_READ_IP|TFF_WRITE_IP)));
if (tcp_fd->tf_flags & TFF_LISTENQ)
{
/* Special code for listen queues */
for (i= 0; i<TFL_LISTEN_MAX; i++)
{
tcp_conn= tcp_fd->tf_listenq[i];
if (!tcp_conn)
continue;
tcp_fd->tf_listenq[i]= NULL;
assert(tcp_conn->tc_fd == tcp_fd);
tcp_conn->tc_fd= NULL;
if (tcp_conn->tc_connInprogress)
{
tcp_conn->tc_connInprogress= 0;
tcp_close_connection(tcp_conn, ENOCONN);
continue;
}
tcp_shutdown (tcp_conn);
if (tcp_conn->tc_state == TCS_ESTABLISHED)
tcp_conn->tc_state= TCS_CLOSING;
/* Set the retransmission timeout a bit smaller. */
tcp_conn->tc_rt_dead= TCP_DEF_RT_MAX_CLOSING;
/* If all data has been acknowledged, close the connection. */
if (tcp_conn->tc_SND_UNA == tcp_conn->tc_SND_NXT)
tcp_close_connection(tcp_conn, ENOTCONN);
}
tcp_conn= tcp_fd->tf_conn;
assert(tcp_conn->tc_fd == tcp_fd);
assert (tcp_conn->tc_connInprogress);
tcp_conn->tc_connInprogress= 0;
tcp_conn->tc_fd= NULL;
tcp_fd->tf_conn= NULL;
tcp_close_connection(tcp_conn, ENOCONN);
}
for (i= 0; i<TFL_LISTEN_MAX; i++)
{
assert(tcp_fd->tf_listenq[i] == NULL);
}
tcp_fd->tf_flags &= ~TFF_INUSE;
if (!tcp_fd->tf_conn)
return;
tcp_conn= tcp_fd->tf_conn;
assert(tcp_conn->tc_fd == tcp_fd);
tcp_conn->tc_fd= NULL;
assert (!tcp_conn->tc_connInprogress);
tcp_shutdown (tcp_conn);
if (tcp_conn->tc_state == TCS_ESTABLISHED)
{
tcp_conn->tc_state= TCS_CLOSING;
}
/* Set the retransmission timeout a bit smaller. */
tcp_conn->tc_rt_dead= TCP_DEF_RT_MAX_CLOSING;
/* If all data has been acknowledged, close the connection. */
if (tcp_conn->tc_SND_UNA == tcp_conn->tc_SND_NXT)
tcp_close_connection(tcp_conn, ENOTCONN);
}
PUBLIC int tcp_cancel(fd, which_operation)
int fd;
int which_operation;
{
tcp_fd_t *tcp_fd;
tcp_conn_t *tcp_conn;
tcp_fd= &tcp_fd_table[fd];
assert (tcp_fd->tf_flags & TFF_INUSE);
tcp_conn= tcp_fd->tf_conn;
switch (which_operation)
{
case SR_CANCEL_WRITE:
assert (tcp_fd->tf_flags & TFF_WRITE_IP);
tcp_fd->tf_flags &= ~TFF_WRITE_IP;
if (tcp_fd->tf_write_offset)
reply_thr_get (tcp_fd, tcp_fd->tf_write_offset, FALSE);
else
reply_thr_get (tcp_fd, EINTR, FALSE);
break;
case SR_CANCEL_READ:
assert (tcp_fd->tf_flags & TFF_READ_IP);
tcp_fd->tf_flags &= ~TFF_READ_IP;
if (tcp_fd->tf_read_offset)
reply_thr_put (tcp_fd, tcp_fd->tf_read_offset, FALSE);
else
reply_thr_put (tcp_fd, EINTR, FALSE);
break;
case SR_CANCEL_IOCTL:
assert (tcp_fd->tf_flags & TFF_IOCTL_IP);
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
switch (tcp_fd->tf_ioreq)
{
case NWIOGTCPCONF:
reply_thr_put (tcp_fd, EINTR, TRUE);
break;
case NWIOSTCPCONF:
case NWIOTCPSHUTDOWN:
reply_thr_get (tcp_fd, EINTR, TRUE);
break;
case NWIOTCPCONN:
case NWIOTCPLISTEN:
assert (tcp_conn->tc_connInprogress);
tcp_conn->tc_connInprogress= 0;
tcp_conn->tc_fd= NULL;
tcp_fd->tf_conn= NULL;
tcp_close_connection(tcp_conn, ENOCONN);
reply_thr_get (tcp_fd, EINTR, TRUE);
break;
default:
ip_warning(( "unknown ioctl inprogress: 0x%x",
tcp_fd->tf_ioreq ));
reply_thr_get (tcp_fd, EINTR, TRUE);
break;
}
break;
default:
ip_panic(( "unknown cancel request" ));
break;
}
return NW_OK;
}
/*
tcp_connect
*/
PRIVATE int tcp_connect(tcp_fd)
tcp_fd_t *tcp_fd;
{
tcp_conn_t *tcp_conn;
if (!(tcp_fd->tf_flags & TFF_CONF_SET))
{
tcp_reply_ioctl(tcp_fd, EBADMODE);
return NW_OK;
}
assert (!(tcp_fd->tf_flags & TFF_CONNECTEDx) &&
!(tcp_fd->tf_flags & TFF_CONNECTING) &&
!(tcp_fd->tf_flags & TFF_LISTENQ));
if ((tcp_fd->tf_tcpconf.nwtc_flags & (NWTC_SET_RA|NWTC_SET_RP))
!= (NWTC_SET_RA|NWTC_SET_RP))
{
tcp_reply_ioctl(tcp_fd, EBADMODE);
return NW_OK;
}
assert(!tcp_fd->tf_conn);
tcp_conn= find_conn_entry(tcp_fd->tf_tcpconf.nwtc_locport,
tcp_fd->tf_port->tp_ipaddr,
tcp_fd->tf_tcpconf.nwtc_remport,
tcp_fd->tf_tcpconf.nwtc_remaddr);
if (tcp_conn)
{
if (tcp_conn->tc_fd)
{
tcp_reply_ioctl(tcp_fd, EADDRINUSE);
return NW_OK;
}
}
else
{
tcp_conn= find_empty_conn();
if (!tcp_conn)
{
tcp_reply_ioctl(tcp_fd, EAGAIN);
return NW_OK;
}
}
tcp_fd->tf_conn= tcp_conn;
return tcp_su4connect(tcp_fd);
}
/*
tcp_su4connect
*/
PRIVATE int tcp_su4connect(tcp_fd)
tcp_fd_t *tcp_fd;
{
tcp_conn_t *tcp_conn;
tcp_conn= tcp_fd->tf_conn;
tcp_conn->tc_locport= tcp_fd->tf_tcpconf.nwtc_locport;
tcp_conn->tc_locaddr= tcp_fd->tf_port->tp_ipaddr;
assert (tcp_fd->tf_tcpconf.nwtc_flags & NWTC_SET_RP);
assert (tcp_fd->tf_tcpconf.nwtc_flags & NWTC_SET_RA);
tcp_conn->tc_remport= tcp_fd->tf_tcpconf.nwtc_remport;
tcp_conn->tc_remaddr= tcp_fd->tf_tcpconf.nwtc_remaddr;
tcp_setup_conn(tcp_fd->tf_port, tcp_conn);
tcp_conn->tc_fd= tcp_fd;
tcp_conn->tc_connInprogress= 1;
tcp_conn->tc_orglisten= FALSE;
tcp_conn->tc_state= TCS_SYN_SENT;
tcp_conn->tc_rt_dead= TCP_DEF_RT_MAX_CONNECT;
/* Start the timer (if necessary) */
tcp_set_send_timer(tcp_conn);
tcp_conn_write(tcp_conn, 0);
if (tcp_conn->tc_connInprogress)
return NW_SUSPEND;
else
return NW_OK;
}
/*
tcp_listen
*/
PRIVATE int tcp_listen(tcp_fd, do_listenq)
tcp_fd_t *tcp_fd;
int do_listenq;
{
tcp_conn_t *tcp_conn;
if (!(tcp_fd->tf_flags & TFF_CONF_SET))
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get(tcp_fd, EBADMODE, TRUE);
return NW_OK;
}
assert (!(tcp_fd->tf_flags & TFF_CONNECTEDx) &&
!(tcp_fd->tf_flags & TFF_CONNECTING) &&
!(tcp_fd->tf_flags & TFF_LISTENQ));
tcp_conn= tcp_fd->tf_conn;
assert(!tcp_conn);
if ((tcp_fd->tf_tcpconf.nwtc_flags & (NWTC_SET_RA|NWTC_SET_RP))
== (NWTC_SET_RA|NWTC_SET_RP))
{
tcp_conn= find_conn_entry(
tcp_fd->tf_tcpconf.nwtc_locport,
tcp_fd->tf_port->tp_ipaddr,
tcp_fd->tf_tcpconf.nwtc_remport,
tcp_fd->tf_tcpconf.nwtc_remaddr);
if (tcp_conn)
{
if (tcp_conn->tc_fd)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, EADDRINUSE, TRUE);
return NW_OK;
}
tcp_fd->tf_conn= tcp_conn;
return tcp_su4listen(tcp_fd, tcp_conn, do_listenq);
}
}
tcp_conn= find_empty_conn();
if (!tcp_conn)
{
tcp_fd->tf_flags &= ~TFF_IOCTL_IP;
reply_thr_get (tcp_fd, EAGAIN, TRUE);
return NW_OK;
}
tcp_fd->tf_conn= tcp_conn;
return tcp_su4listen(tcp_fd, tcp_conn, do_listenq);
}
/*
tcp_acceptto
*/
PRIVATE int tcp_acceptto(tcp_fd)
tcp_fd_t *tcp_fd;
{
int i, dst_nr;
tcp_fd_t *dst_fd;
tcp_conn_t *tcp_conn;
tcp_cookie_t *cookiep;
acc_t *data;
if (!(tcp_fd->tf_flags & TFF_LISTENQ))
{
tcp_reply_ioctl(tcp_fd, EINVAL);
return NW_OK;
}
for (i= 0; i<TFL_LISTEN_MAX; i++)
{
tcp_conn= tcp_fd->tf_listenq[i];
if (tcp_conn && !tcp_conn->tc_connInprogress)
break;
}
if (i >= TFL_LISTEN_MAX)
{
/* Nothing, suspend caller */
return NW_SUSPEND;
}
data= (*tcp_fd->tf_get_userdata) (tcp_fd->tf_srfd, 0,
sizeof(*cookiep), TRUE);
if (!data)
return EFAULT;
data= bf_packIffLess(data, sizeof(*cookiep));
cookiep= (tcp_cookie_t *)ptr2acc_data(data);
dst_nr= cookiep->tc_ref;
if (dst_nr < 0 || dst_nr >= TCP_FD_NR)
{
printf("tcp_acceptto: bad fd %d\n", dst_nr);
tcp_reply_ioctl(tcp_fd, EINVAL);
return NW_OK;
}
dst_fd= &tcp_fd_table[dst_nr];
if (!(dst_fd->tf_flags & TFF_INUSE) ||
(dst_fd->tf_flags & (TFF_READ_IP|TFF_WRITE_IP|TFF_IOCTL_IP)) ||
dst_fd->tf_conn != NULL ||
!(dst_fd->tf_flags & TFF_COOKIE))
{
printf("tcp_acceptto: bad flags 0x%x or conn %p for fd %d\n",
dst_fd->tf_flags, dst_fd->tf_conn, dst_nr);
tcp_reply_ioctl(tcp_fd, EINVAL);
return NW_OK;
}
if (memcmp(cookiep, &dst_fd->tf_cookie, sizeof(*cookiep)) != 0)
{
printf("tcp_acceptto: bad cookie\n");
return NW_OK;
}
/* Move connection */
tcp_fd->tf_listenq[i]= NULL;
tcp_conn->tc_fd= dst_fd;
dst_fd->tf_conn= tcp_conn;
dst_fd->tf_flags |= TFF_CONNECTEDx;
tcp_reply_ioctl(tcp_fd, NW_OK);
return NW_OK;
}
PRIVATE void tcp_buffree (priority)
int priority;
{
int i;
tcp_conn_t *tcp_conn;
if (priority == TCP_PRI_FRAG2SEND)
{
for (i=0, tcp_conn= tcp_conn_table; i<TCP_CONN_NR; i++,
tcp_conn++)
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
if (!tcp_conn->tc_frag2send)
continue;
if (tcp_conn->tc_busy)
continue;
bf_afree(tcp_conn->tc_frag2send);
tcp_conn->tc_frag2send= 0;
}
}
if (priority == TCP_PRI_CONN_EXTRA)
{
for (i=0, tcp_conn= tcp_conn_table; i<TCP_CONN_NR; i++,
tcp_conn++)
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
if (tcp_conn->tc_busy)
continue;
if (tcp_conn->tc_adv_data)
{
bf_afree(tcp_conn->tc_adv_data);
tcp_conn->tc_adv_data= NULL;
}
}
}
if (priority == TCP_PRI_CONNwoUSER)
{
for (i=0, tcp_conn= tcp_conn_table; i<TCP_CONN_NR; i++,
tcp_conn++)
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
if (tcp_conn->tc_busy)
continue;
if (tcp_conn->tc_fd)
continue;
if (tcp_conn->tc_state == TCS_CLOSED)
continue;
if (tcp_conn->tc_rcvd_data == NULL &&
tcp_conn->tc_send_data == NULL)
{
continue;
}
tcp_close_connection (tcp_conn, EOUTOFBUFS);
}
}
if (priority == TCP_PRI_CONN_INUSE)
{
for (i=0, tcp_conn= tcp_conn_table; i<TCP_CONN_NR; i++,
tcp_conn++)
{
if (!(tcp_conn->tc_flags & TCF_INUSE))
continue;
if (tcp_conn->tc_busy)
continue;
if (tcp_conn->tc_state == TCS_CLOSED)
continue;
if (tcp_conn->tc_rcvd_data == NULL &&
tcp_conn->tc_send_data == NULL)
{
continue;
}
tcp_close_connection (tcp_conn, EOUTOFBUFS);
}
}
}
#ifdef BUF_CONSISTENCY_CHECK
PRIVATE void tcp_bufcheck()
{
int i;
tcp_conn_t *tcp_conn;
tcp_port_t *tcp_port;
for (i= 0, tcp_port= tcp_port_table; i<tcp_conf_nr; i++, tcp_port++)
{
if (tcp_port->tp_pack)
bf_check_acc(tcp_port->tp_pack);
}
for (i= 0, tcp_conn= tcp_conn_table; i<TCP_CONN_NR; i++, tcp_conn++)
{
assert(!tcp_conn->tc_busy);
if (tcp_conn->tc_rcvd_data)
bf_check_acc(tcp_conn->tc_rcvd_data);
if (tcp_conn->tc_adv_data)
bf_check_acc(tcp_conn->tc_adv_data);
if (tcp_conn->tc_send_data)
bf_check_acc(tcp_conn->tc_send_data);
if (tcp_conn->tc_remipopt)
bf_check_acc(tcp_conn->tc_remipopt);
if (tcp_conn->tc_tcpopt)
bf_check_acc(tcp_conn->tc_tcpopt);
if (tcp_conn->tc_frag2send)
bf_check_acc(tcp_conn->tc_frag2send);
}
}
#endif
PUBLIC void tcp_notreach(tcp_conn)
tcp_conn_t *tcp_conn;
{
int new_ttl;
new_ttl= tcp_conn->tc_ttl;
if (new_ttl == IP_MAX_TTL)
{
if (tcp_conn->tc_state == TCS_SYN_SENT)
tcp_close_connection(tcp_conn, EDSTNOTRCH);
return;
}
else if (new_ttl < TCP_DEF_TTL_NEXT)
new_ttl= TCP_DEF_TTL_NEXT;
else
{
new_ttl *= 2;
if (new_ttl> IP_MAX_TTL)
new_ttl= IP_MAX_TTL;
}
tcp_conn->tc_ttl= new_ttl;
tcp_conn->tc_stt= 0;
tcp_conn->tc_SND_TRM= tcp_conn->tc_SND_UNA;
tcp_conn_write(tcp_conn, 1);
}
FORWARD u32_t mtu_table[]=
{ /* From RFC-1191 */
/* Plateau MTU Comments Reference */
/* ------ --- -------- --------- */
/* 65535 Official maximum MTU RFC 791 */
/* 65535 Hyperchannel RFC 1044 */
65535,
32000, /* Just in case */
/* 17914 16Mb IBM Token Ring ref. [6] */
17914,
/* 8166 IEEE 802.4 RFC 1042 */
8166,
/* 4464 IEEE 802.5 (4Mb max) RFC 1042 */
/* 4352 FDDI (Revised) RFC 1188 */
4352, /* (1%) */
/* 2048 Wideband Network RFC 907 */
/* 2002 IEEE 802.5 (4Mb recommended) RFC 1042 */
2002, /* (2%) */
/* 1536 Exp. Ethernet Nets RFC 895 */
/* 1500 Ethernet Networks RFC 894 */
/* 1500 Point-to-Point (default) RFC 1134 */
/* 1492 IEEE 802.3 RFC 1042 */
1492, /* (3%) */
/* 1006 SLIP RFC 1055 */
/* 1006 ARPANET BBN 1822 */
1006,
/* 576 X.25 Networks RFC 877 */
/* 544 DEC IP Portal ref. [10] */
/* 512 NETBIOS RFC 1088 */
/* 508 IEEE 802/Source-Rt Bridge RFC 1042 */
/* 508 ARCNET RFC 1051 */
508, /* (13%) */
/* 296 Point-to-Point (low delay) RFC 1144 */
296,
68, /* Official minimum MTU RFC 791 */
0, /* End of list */
};
PUBLIC void tcp_mtu_exceeded(tcp_conn)
tcp_conn_t *tcp_conn;
{
u16_t mtu;
int i;
clock_t curr_time;
if (!(tcp_conn->tc_flags & TCF_PMTU))
{
/* Strange, got MTU exceeded but DF is not set. Ignore
* the error. If the problem persists, the connection will
* time-out.
*/
return;
}
curr_time= get_time();
/* We get here in cases. Either were are trying to find an MTU
* that works at all, or we are trying see how far we can increase
* the current MTU. If the last change to the MTU was a long time
* ago, we assume the second case.
*/
if (curr_time >= tcp_conn->tc_mtutim + TCP_PMTU_INCR_IV)
{
mtu= tcp_conn->tc_mtu;
mtu -= mtu/TCP_PMTU_INCR_FRAC;
tcp_conn->tc_mtu= mtu;
tcp_conn->tc_mtutim= curr_time;
DBLOCK(1, printf(
"tcp_mtu_exceeded: new (lowered) mtu %d for conn %d\n",
mtu, tcp_conn-tcp_conn_table));
tcp_conn->tc_stt= 0;
tcp_conn->tc_SND_TRM= tcp_conn->tc_SND_UNA;
tcp_conn_write(tcp_conn, 1);
return;
}
tcp_conn->tc_mtutim= curr_time;
mtu= tcp_conn->tc_mtu;
for (i= 0; mtu_table[i] >= mtu; i++)
; /* Nothing to do */
mtu= mtu_table[i];
if (mtu >= TCP_MIN_PATH_MTU)
{
tcp_conn->tc_mtu= mtu;
}
else
{
/* Small MTUs can be used for denial-of-service attacks.
* Switch-off PMTU if the MTU becomes too small.
*/
tcp_conn->tc_flags &= ~TCF_PMTU;
tcp_conn->tc_mtu= TCP_MIN_PATH_MTU;
DBLOCK(1, printf(
"tcp_mtu_exceeded: clearing TCF_PMTU for conn %d\n",
tcp_conn-tcp_conn_table););
}
DBLOCK(1, printf("tcp_mtu_exceeded: new mtu %d for conn %d\n",
mtu, tcp_conn-tcp_conn_table););
tcp_conn->tc_stt= 0;
tcp_conn->tc_SND_TRM= tcp_conn->tc_SND_UNA;
tcp_conn_write(tcp_conn, 1);
}
PUBLIC void tcp_mtu_incr(tcp_conn)
tcp_conn_t *tcp_conn;
{
clock_t curr_time;
u32_t mtu;
assert(tcp_conn->tc_mtu < tcp_conn->tc_max_mtu);
if (!(tcp_conn->tc_flags & TCF_PMTU))
{
/* Use a much longer time-out for retrying PMTU discovery
* after is has been disabled. Note that PMTU discovery
* can be disabled during a short loss of connectivity.
*/
curr_time= get_time();
if (curr_time > tcp_conn->tc_mtutim+TCP_PMTU_EN_IV)
{
tcp_conn->tc_flags |= TCF_PMTU;
DBLOCK(1, printf(
"tcp_mtu_incr: setting TCF_PMTU for conn %d\n",
tcp_conn-tcp_conn_table););
}
return;
}
mtu= tcp_conn->tc_mtu;
mtu += mtu/TCP_PMTU_INCR_FRAC;
if (mtu > tcp_conn->tc_max_mtu)
mtu= tcp_conn->tc_max_mtu;
tcp_conn->tc_mtu= mtu;
DBLOCK(0x1, printf("tcp_mtu_incr: new mtu %ld for conn %d\n",
mtu, tcp_conn-tcp_conn_table););
}
/*
tcp_setup_conn
*/
PRIVATE void tcp_setup_conn(tcp_port, tcp_conn)
tcp_port_t *tcp_port;
tcp_conn_t *tcp_conn;
{
u16_t mss;
assert(!tcp_conn->tc_connInprogress);
tcp_conn->tc_port= tcp_port;
if (tcp_conn->tc_flags & TCF_INUSE)
{
assert (tcp_conn->tc_state == TCS_CLOSED);
assert (!tcp_conn->tc_send_data);
if (tcp_conn->tc_senddis < get_time())
tcp_conn->tc_ISS= 0;
}
else
{
assert(!tcp_conn->tc_busy);
tcp_conn->tc_senddis= 0;
tcp_conn->tc_ISS= 0;
tcp_conn->tc_tos= TCP_DEF_TOS;
tcp_conn->tc_ttl= TCP_DEF_TTL;
tcp_conn->tc_rcv_wnd= TCP_MAX_RCV_WND_SIZE;
tcp_conn->tc_fd= NULL;
}
if (!tcp_conn->tc_ISS)
{
tcp_conn->tc_ISS= tcp_rand32();
}
tcp_conn->tc_SND_UNA= tcp_conn->tc_ISS;
tcp_conn->tc_SND_TRM= tcp_conn->tc_ISS;
tcp_conn->tc_SND_NXT= tcp_conn->tc_ISS+1;
tcp_conn->tc_SND_UP= tcp_conn->tc_ISS;
tcp_conn->tc_SND_PSH= tcp_conn->tc_ISS+1;
tcp_conn->tc_IRS= 0;
tcp_conn->tc_RCV_LO= tcp_conn->tc_IRS;
tcp_conn->tc_RCV_NXT= tcp_conn->tc_IRS;
tcp_conn->tc_RCV_HI= tcp_conn->tc_IRS;
tcp_conn->tc_RCV_UP= tcp_conn->tc_IRS;
assert(tcp_conn->tc_rcvd_data == NULL);
assert(tcp_conn->tc_adv_data == NULL);
assert(tcp_conn->tc_send_data == NULL);
tcp_conn->tc_ka_time= TCP_DEF_KEEPALIVE;
tcp_conn->tc_remipopt= NULL;
tcp_conn->tc_tcpopt= NULL;
assert(tcp_conn->tc_frag2send == NULL);
tcp_conn->tc_stt= 0;
tcp_conn->tc_rt_dead= TCP_DEF_RT_DEAD;
tcp_conn->tc_0wnd_to= 0;
tcp_conn->tc_artt= TCP_DEF_RTT*TCP_RTT_SCALE;
tcp_conn->tc_drtt= 0;
tcp_conn->tc_rtt= TCP_DEF_RTT;
tcp_conn->tc_max_mtu= tcp_conn->tc_port->tp_mtu;
tcp_conn->tc_mtu= tcp_conn->tc_max_mtu;
tcp_conn->tc_mtutim= 0;
tcp_conn->tc_error= NW_OK;
mss= tcp_conn->tc_mtu-IP_TCP_MIN_HDR_SIZE;
tcp_conn->tc_snd_cwnd= tcp_conn->tc_SND_UNA + 2*mss;
tcp_conn->tc_snd_cthresh= TCP_MAX_SND_WND_SIZE;
tcp_conn->tc_snd_cinc=
(long)TCP_DEF_MSS*TCP_DEF_MSS/TCP_MAX_SND_WND_SIZE+1;
tcp_conn->tc_snd_wnd= TCP_MAX_SND_WND_SIZE;
tcp_conn->tc_rt_time= 0;
tcp_conn->tc_rt_seq= 0;
tcp_conn->tc_rt_threshold= tcp_conn->tc_ISS;
tcp_conn->tc_flags= TCF_INUSE;
tcp_conn->tc_flags |= TCF_PMTU;
clck_untimer(&tcp_conn->tc_transmit_timer);
tcp_conn->tc_transmit_seq= 0;
}
PRIVATE u32_t tcp_rand32()
{
u8_t bits[RAND256_BUFSIZE];
rand256(bits);
return bits[0] | (bits[1] << 8) | (bits[2] << 16) | (bits[3] << 24);
}
/*
* $PchId: tcp.c,v 1.34 2005/06/28 14:20:27 philip Exp $
*/
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