minix3/net/inet/generic/tcp_lib.c

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2020-02-21 00:59:27 +05:30
/*
tcp_lib.c
Copyright 1995 Philip Homburg
*/
#include "inet.h"
#include "buf.h"
#include "clock.h"
#include "event.h"
#include "io.h"
#include "type.h"
#include "assert.h"
#include "tcp_int.h"
THIS_FILE
#undef tcp_LEmod4G
int tcp_LEmod4G(n1, n2)
u32_t n1;
u32_t n2;
{
return !((u32_t)(n2-n1) & 0x80000000L);
}
#undef tcp_GEmod4G
int tcp_GEmod4G(n1, n2)
u32_t n1;
u32_t n2;
{
return !((u32_t)(n1-n2) & 0x80000000L);
}
#undef tcp_Lmod4G
int tcp_Lmod4G(n1, n2)
u32_t n1;
u32_t n2;
{
return !!((u32_t)(n1-n2) & 0x80000000L);
}
#undef tcp_Gmod4G
int tcp_Gmod4G(n1, n2)
u32_t n1;
u32_t n2;
{
return !!((u32_t)(n2-n1) & 0x80000000L);
}
void tcp_extract_ipopt(tcp_conn, ip_hdr)
tcp_conn_t *tcp_conn;
ip_hdr_t *ip_hdr;
{
int ip_hdr_len;
ip_hdr_len= (ip_hdr->ih_vers_ihl & IH_IHL_MASK) << 2;
if (ip_hdr_len == IP_MIN_HDR_SIZE)
return;
DBLOCK(1, printf("ip_hdr options NOT supported (yet?)\n"));
}
void tcp_extract_tcpopt(tcp_conn, tcp_hdr, mssp)
tcp_conn_t *tcp_conn;
tcp_hdr_t *tcp_hdr;
size_t *mssp;
{
int i, tcp_hdr_len, type, len;
u8_t *cp;
u16_t mss;
*mssp= 0; /* No mss */
tcp_hdr_len= (tcp_hdr->th_data_off & TH_DO_MASK) >> 2;
if (tcp_hdr_len == TCP_MIN_HDR_SIZE)
return;
i= TCP_MIN_HDR_SIZE;
while (i<tcp_hdr_len)
{
cp= ((u8_t *)tcp_hdr)+i;
type= cp[0];
if (type == TCP_OPT_NOP)
{
i++;
continue;
}
if (type == TCP_OPT_EOL)
break;
if (i+2 > tcp_hdr_len)
break; /* No length field */
len= cp[1];
if (i+len > tcp_hdr_len)
break; /* Truncated option */
i += len;
switch(type)
{
case TCP_OPT_MSS:
if (len != 4)
break;
mss= (cp[2] << 8) | cp[3];
DBLOCK(1, printf("tcp_extract_tcpopt: got mss %d\n",
mss););
*mssp= mss;
break;
case TCP_OPT_WSOPT: /* window scale option */
case TCP_OPT_SACKOK: /* SACK permitted */
case TCP_OPT_TS: /* Timestamps option */
case TCP_OPT_CCNEW: /* new connection count */
/* Ignore this option. */
break;
default:
DBLOCK(0x1,
printf(
"tcp_extract_tcpopt: unknown option %d, len %d\n",
type, len));
break;
}
}
}
u16_t tcp_pack_oneCsum(ip_hdr, tcp_pack)
ip_hdr_t *ip_hdr;
acc_t *tcp_pack;
{
size_t ip_hdr_len;
acc_t *pack;
u16_t sum;
u16_t word_buf[6];
int odd_length;
char *data_ptr;
int length;
ip_hdr_len= (ip_hdr->ih_vers_ihl & IH_IHL_MASK) << 2;
word_buf[0]= ip_hdr->ih_src & 0xffff;
word_buf[1]= (ip_hdr->ih_src >> 16) & 0xffff;
word_buf[2]= ip_hdr->ih_dst & 0xffff;
word_buf[3]= (ip_hdr->ih_dst >> 16) & 0xffff;
word_buf[4]= HTONS(IPPROTO_TCP);
word_buf[5]= htons(ntohs(ip_hdr->ih_length)-ip_hdr_len);
sum= oneC_sum(0, word_buf, sizeof(word_buf));
pack= tcp_pack;
odd_length= 0;
for (; pack; pack= pack->acc_next)
{
data_ptr= ptr2acc_data(pack);
length= pack->acc_length;
if (!length)
continue;
sum= oneC_sum (sum, (u16_t *)data_ptr, length);
if (length & 1)
{
odd_length= !odd_length;
sum= ((sum >> 8) & 0xff) | ((sum & 0xff) << 8);
}
}
if (odd_length)
{
/* Undo the last swap */
sum= ((sum >> 8) & 0xff) | ((sum & 0xff) << 8);
}
return sum;
}
void tcp_get_ipopt(tcp_conn, ip_hdropt)
tcp_conn_t *tcp_conn;
ip_hdropt_t *ip_hdropt;
{
if (!tcp_conn->tc_remipopt)
{
ip_hdropt->iho_opt_siz= 0;
return;
}
DBLOCK(1, printf("ip_hdr options NOT supported (yet?)\n"));
ip_hdropt->iho_opt_siz= 0;
return;
}
void tcp_get_tcpopt(tcp_conn, tcp_hdropt)
tcp_conn_t *tcp_conn;
tcp_hdropt_t *tcp_hdropt;
{
int optsiz;
if (!tcp_conn->tc_tcpopt)
{
tcp_hdropt->tho_opt_siz= 0;
return;
}
tcp_conn->tc_tcpopt= bf_pack(tcp_conn->tc_tcpopt);
optsiz= bf_bufsize(tcp_conn->tc_tcpopt);
memcpy(tcp_hdropt->tho_data, ptr2acc_data(tcp_conn->tc_tcpopt),
optsiz);
if ((optsiz & 3) != 0)
{
tcp_hdropt->tho_data[optsiz]= TCP_OPT_EOL;
optsiz= (optsiz+3) & ~3;
}
tcp_hdropt->tho_opt_siz= optsiz;
return;
}
acc_t *tcp_make_header(tcp_conn, ref_ip_hdr, ref_tcp_hdr, data)
tcp_conn_t *tcp_conn;
ip_hdr_t **ref_ip_hdr;
tcp_hdr_t **ref_tcp_hdr;
acc_t *data;
{
ip_hdropt_t ip_hdropt;
tcp_hdropt_t tcp_hdropt;
ip_hdr_t *ip_hdr;
tcp_hdr_t *tcp_hdr;
acc_t *hdr_acc;
char *ptr2hdr;
int closed_connection;
closed_connection= (tcp_conn->tc_state == TCS_CLOSED);
if (tcp_conn->tc_remipopt || tcp_conn->tc_tcpopt)
{
tcp_get_ipopt (tcp_conn, &ip_hdropt);
tcp_get_tcpopt (tcp_conn, &tcp_hdropt);
assert (!(ip_hdropt.iho_opt_siz & 3));
assert (!(tcp_hdropt.tho_opt_siz & 3));
hdr_acc= bf_memreq(IP_MIN_HDR_SIZE+
ip_hdropt.iho_opt_siz+TCP_MIN_HDR_SIZE+
tcp_hdropt.tho_opt_siz);
ptr2hdr= ptr2acc_data(hdr_acc);
ip_hdr= (ip_hdr_t *)ptr2hdr;
ptr2hdr += IP_MIN_HDR_SIZE;
if (ip_hdropt.iho_opt_siz)
{
memcpy(ptr2hdr, (char *)ip_hdropt.iho_data,
ip_hdropt.iho_opt_siz);
}
ptr2hdr += ip_hdropt.iho_opt_siz;
tcp_hdr= (tcp_hdr_t *)ptr2hdr;
ptr2hdr += TCP_MIN_HDR_SIZE;
if (tcp_hdropt.tho_opt_siz)
{
memcpy (ptr2hdr, (char *)tcp_hdropt.tho_data,
tcp_hdropt.tho_opt_siz);
}
hdr_acc->acc_next= data;
ip_hdr->ih_vers_ihl= (IP_MIN_HDR_SIZE+
ip_hdropt.iho_opt_siz) >> 2;
tcp_hdr->th_data_off= (TCP_MIN_HDR_SIZE+
tcp_hdropt.tho_opt_siz) << 2;
}
else
{
hdr_acc= bf_memreq(IP_MIN_HDR_SIZE+TCP_MIN_HDR_SIZE);
ip_hdr= (ip_hdr_t *)ptr2acc_data(hdr_acc);
tcp_hdr= (tcp_hdr_t *)&ip_hdr[1];
hdr_acc->acc_next= data;
ip_hdr->ih_vers_ihl= IP_MIN_HDR_SIZE >> 2;
tcp_hdr->th_data_off= TCP_MIN_HDR_SIZE << 2;
}
if (!closed_connection && (tcp_conn->tc_state == TCS_CLOSED))
{
DBLOCK(1, printf("connection closed while inuse\n"));
bf_afree(hdr_acc);
return 0;
}
ip_hdr->ih_tos= tcp_conn->tc_tos;
ip_hdr->ih_ttl= tcp_conn->tc_ttl;
ip_hdr->ih_proto= IPPROTO_TCP;
ip_hdr->ih_src= tcp_conn->tc_locaddr;
ip_hdr->ih_dst= tcp_conn->tc_remaddr;
ip_hdr->ih_flags_fragoff= 0;
if (tcp_conn->tc_flags & TCF_PMTU)
ip_hdr->ih_flags_fragoff |= HTONS(IH_DONT_FRAG);
tcp_hdr->th_srcport= tcp_conn->tc_locport;
tcp_hdr->th_dstport= tcp_conn->tc_remport;
tcp_hdr->th_seq_nr= tcp_conn->tc_RCV_NXT;
tcp_hdr->th_flags= 0;
tcp_hdr->th_window= htons(tcp_conn->tc_RCV_HI-tcp_conn->tc_RCV_LO);
tcp_hdr->th_chksum= 0;
*ref_ip_hdr= ip_hdr;
*ref_tcp_hdr= tcp_hdr;
return hdr_acc;
}
void tcp_print_state (tcp_conn)
tcp_conn_t *tcp_conn;
{
#if DEBUG
printf("tcp_conn_table[%d]->tc_state= ", tcp_conn-
tcp_conn_table);
if (!(tcp_conn->tc_flags & TCF_INUSE))
{
printf("not inuse\n");
return;
}
switch (tcp_conn->tc_state)
{
case TCS_CLOSED: printf("CLOSED"); break;
case TCS_LISTEN: printf("LISTEN"); break;
case TCS_SYN_RECEIVED: printf("SYN_RECEIVED"); break;
case TCS_SYN_SENT: printf("SYN_SENT"); break;
case TCS_ESTABLISHED: printf("ESTABLISHED"); break;
case TCS_CLOSING: printf("CLOSING"); break;
default: printf("unknown (=%d)", tcp_conn->tc_state); break;
}
#endif
}
int tcp_check_conn(tcp_conn)
tcp_conn_t *tcp_conn;
{
int allright;
u32_t lo_queue, hi_queue;
int size;
allright= TRUE;
if (tcp_conn->tc_inconsistent)
{
assert(tcp_conn->tc_inconsistent == 1);
printf("tcp_check_conn: connection is inconsistent\n");
return allright;
}
/* checking receive queue */
lo_queue= tcp_conn->tc_RCV_LO;
if (lo_queue == tcp_conn->tc_IRS)
lo_queue++;
if (lo_queue == tcp_conn->tc_RCV_NXT && (tcp_conn->tc_flags &
TCF_FIN_RECV))
lo_queue--;
hi_queue= tcp_conn->tc_RCV_NXT;
if (hi_queue == tcp_conn->tc_IRS)
hi_queue++;
if (tcp_conn->tc_flags & TCF_FIN_RECV)
hi_queue--;
size= hi_queue-lo_queue;
if (size<0)
{
printf("rcv hi_queue-lo_queue < 0\n");
printf("SND_NXT= 0x%lx, SND_UNA= 0x%lx\n",
(unsigned long)tcp_conn->tc_SND_NXT,
(unsigned long)tcp_conn->tc_SND_UNA);
printf("lo_queue= 0x%lx, hi_queue= 0x%lx\n",
(unsigned long)lo_queue,
(unsigned long)hi_queue);
printf("size= %d\n", size);
allright= FALSE;
}
else if (!tcp_conn->tc_rcvd_data)
{
if (size)
{
printf("RCV_NXT-RCV_LO != 0\n");
tcp_print_conn(tcp_conn);
printf("lo_queue= %u, hi_queue= %u\n",
lo_queue, hi_queue);
allright= FALSE;
}
}
else if (size != bf_bufsize(tcp_conn->tc_rcvd_data))
{
printf("RCV_NXT-RCV_LO != sizeof tc_rcvd_data\n");
tcp_print_conn(tcp_conn);
printf(
"lo_queue= %u, hi_queue= %u, sizeof tc_rcvd_data= %d\n",
lo_queue, hi_queue, bf_bufsize(tcp_conn->tc_rcvd_data));
allright= FALSE;
}
else if (size != 0 && (tcp_conn->tc_state == TCS_CLOSED ||
tcp_conn->tc_state == TCS_LISTEN ||
tcp_conn->tc_state == TCS_SYN_RECEIVED ||
tcp_conn->tc_state == TCS_SYN_SENT))
{
printf("received data but not connected\n");
tcp_print_conn(tcp_conn);
allright= FALSE;
}
if (tcp_Lmod4G(tcp_conn->tc_RCV_HI, tcp_conn->tc_RCV_NXT))
{
printf("tc_RCV_HI (0x%lx) < tc_RCV_NXT (0x%lx)\n",
(unsigned long)tcp_conn->tc_RCV_HI,
(unsigned long)tcp_conn->tc_RCV_NXT);
allright= FALSE;
}
/* checking send data */
lo_queue= tcp_conn->tc_SND_UNA;
if (lo_queue == tcp_conn->tc_ISS)
lo_queue++;
if (lo_queue == tcp_conn->tc_SND_NXT &&
(tcp_conn->tc_flags & TCF_FIN_SENT))
{
lo_queue--;
}
hi_queue= tcp_conn->tc_SND_NXT;
if (hi_queue == tcp_conn->tc_ISS)
hi_queue++;
if (tcp_conn->tc_flags & TCF_FIN_SENT)
hi_queue--;
size= hi_queue-lo_queue;
if (size<0)
{
printf("snd hi_queue-lo_queue < 0\n");
printf("SND_ISS= 0x%lx, SND_UNA= 0x%lx, SND_NXT= 0x%lx\n",
(unsigned long)tcp_conn->tc_ISS,
(unsigned long)tcp_conn->tc_SND_UNA,
(unsigned long)tcp_conn->tc_SND_NXT);
printf("hi_queue= 0x%lx, lo_queue= 0x%lx, size= %d\n",
(unsigned long)hi_queue, (unsigned long)lo_queue,
size);
allright= FALSE;
}
else if (!tcp_conn->tc_send_data)
{
if (size)
{
printf("SND_NXT-SND_UNA != 0\n");
printf("SND_NXT= 0x%lx, SND_UNA= 0x%lx\n",
(unsigned long)tcp_conn->tc_SND_NXT,
(unsigned long)tcp_conn->tc_SND_UNA);
printf("lo_queue= 0x%lx, hi_queue= 0x%lx\n",
(unsigned long)lo_queue,
(unsigned long)hi_queue);
allright= FALSE;
}
}
else if (size != bf_bufsize(tcp_conn->tc_send_data))
{
printf("SND_NXT-SND_UNA != sizeof tc_send_data\n");
printf("SND_NXT= 0x%lx, SND_UNA= 0x%lx\n",
(unsigned long)tcp_conn->tc_SND_NXT,
(unsigned long)tcp_conn->tc_SND_UNA);
printf("lo_queue= 0x%lx, lo_queue= 0x%lx\n",
(unsigned long)lo_queue,
(unsigned long)hi_queue);
printf("bf_bufsize(data)= %d\n",
bf_bufsize(tcp_conn->tc_send_data));
allright= FALSE;
}
/* checking counters */
if (!tcp_GEmod4G(tcp_conn->tc_SND_UNA, tcp_conn->tc_ISS))
{
printf("SND_UNA < ISS\n");
allright= FALSE;
}
if (!tcp_GEmod4G(tcp_conn->tc_SND_NXT, tcp_conn->tc_SND_UNA))
{
printf("SND_NXT<SND_UNA\n");
allright= FALSE;
}
if (!tcp_GEmod4G(tcp_conn->tc_SND_TRM, tcp_conn->tc_SND_UNA))
{
printf("SND_TRM<SND_UNA\n");
allright= FALSE;
}
if (!tcp_GEmod4G(tcp_conn->tc_SND_NXT, tcp_conn->tc_SND_TRM))
{
printf("SND_NXT<SND_TRM\n");
allright= FALSE;
}
DIFBLOCK(1, (!allright), printf("tcp_check_conn: not allright\n"));
return allright;
}
void tcp_print_pack(ip_hdr, tcp_hdr)
ip_hdr_t *ip_hdr;
tcp_hdr_t *tcp_hdr;
{
int tcp_hdr_len;
assert(tcp_hdr);
if (ip_hdr)
writeIpAddr(ip_hdr->ih_src);
else
printf("???");
printf(",%u ", ntohs(tcp_hdr->th_srcport));
if (ip_hdr)
writeIpAddr(ip_hdr->ih_dst);
else
printf("???");
printf(",%u ", ntohs(tcp_hdr->th_dstport));
printf(" 0x%x", ntohl(tcp_hdr->th_seq_nr));
if (tcp_hdr->th_flags & THF_FIN)
printf(" <FIN>");
if (tcp_hdr->th_flags & THF_SYN)
printf(" <SYN>");
if (tcp_hdr->th_flags & THF_RST)
printf(" <RST>");
if (tcp_hdr->th_flags & THF_PSH)
printf(" <PSH>");
if (tcp_hdr->th_flags & THF_ACK)
printf(" <ACK 0x%x %u>", ntohl(tcp_hdr->th_ack_nr),
ntohs(tcp_hdr->th_window));
if (tcp_hdr->th_flags & THF_URG)
printf(" <URG %u>", tcp_hdr->th_urgptr);
tcp_hdr_len= (tcp_hdr->th_data_off & TH_DO_MASK) >> 2;
if (tcp_hdr_len != TCP_MIN_HDR_SIZE)
printf(" <options %d>", tcp_hdr_len-TCP_MIN_HDR_SIZE);
}
void tcp_print_conn(tcp_conn)
tcp_conn_t *tcp_conn;
{
u32_t iss, irs;
tcp_fd_t *tcp_fd;
iss= tcp_conn->tc_ISS;
irs= tcp_conn->tc_IRS;
tcp_print_state (tcp_conn);
printf(
" ISS 0x%x UNA +0x%x(0x%x) TRM +0x%x(0x%x) NXT +0x%x(0x%x)",
iss, tcp_conn->tc_SND_UNA-iss, tcp_conn->tc_SND_UNA,
tcp_conn->tc_SND_TRM-iss, tcp_conn->tc_SND_TRM,
tcp_conn->tc_SND_NXT-iss, tcp_conn->tc_SND_NXT);
printf(
" UP +0x%x(0x%x) PSH +0x%x(0x%x) ",
tcp_conn->tc_SND_UP-iss, tcp_conn->tc_SND_UP,
tcp_conn->tc_SND_PSH-iss, tcp_conn->tc_SND_PSH);
printf(" snd_cwnd +0x%x(0x%x)",
tcp_conn->tc_snd_cwnd-tcp_conn->tc_SND_UNA,
tcp_conn->tc_snd_cwnd);
printf(" transmit_seq ");
if (tcp_conn->tc_transmit_seq == 0)
printf("0");
else
{
printf("+0x%x(0x%x)", tcp_conn->tc_transmit_seq-iss,
tcp_conn->tc_transmit_seq);
}
printf(" IRS 0x%x LO +0x%x(0x%x) NXT +0x%x(0x%x) HI +0x%x(0x%x)",
irs, tcp_conn->tc_RCV_LO-irs, tcp_conn->tc_RCV_LO,
tcp_conn->tc_RCV_NXT-irs, tcp_conn->tc_RCV_NXT,
tcp_conn->tc_RCV_HI-irs, tcp_conn->tc_RCV_HI);
if (tcp_conn->tc_flags & TCF_INUSE)
printf(" TCF_INUSE");
if (tcp_conn->tc_flags & TCF_FIN_RECV)
printf(" TCF_FIN_RECV");
if (tcp_conn->tc_flags & TCF_RCV_PUSH)
printf(" TCF_RCV_PUSH");
if (tcp_conn->tc_flags & TCF_MORE2WRITE)
printf(" TCF_MORE2WRITE");
if (tcp_conn->tc_flags & TCF_SEND_ACK)
printf(" TCF_SEND_ACK");
if (tcp_conn->tc_flags & TCF_FIN_SENT)
printf(" TCF_FIN_SENT");
if (tcp_conn->tc_flags & TCF_BSD_URG)
printf(" TCF_BSD_URG");
if (tcp_conn->tc_flags & TCF_NO_PUSH)
printf(" TCF_NO_PUSH");
if (tcp_conn->tc_flags & TCF_PUSH_NOW)
printf(" TCF_PUSH_NOW");
if (tcp_conn->tc_flags & TCF_PMTU)
printf(" TCF_PMTU");
printf("\n");
writeIpAddr(tcp_conn->tc_locaddr);
printf(", %u -> ", ntohs(tcp_conn->tc_locport));
writeIpAddr(tcp_conn->tc_remaddr);
printf(", %u\n", ntohs(tcp_conn->tc_remport));
tcp_fd= tcp_conn->tc_fd;
if (!tcp_fd)
printf("tc_fd NULL");
else
{
printf("tc_fd #%d: flags 0x%lx, r %u@%u, w %u@%u",
tcp_fd-tcp_fd_table, tcp_fd->tf_flags,
tcp_fd->tf_read_count, tcp_fd->tf_read_offset,
tcp_fd->tf_write_count, tcp_fd->tf_write_offset);
}
}
/*
* $PchId: tcp_lib.c,v 1.14 2005/01/31 21:41:38 philip Exp $
*/