internal void copy_from(tcp_seg seg)
{
this.next = seg.next;
this.p = seg.p;
this.len = seg.len;
#if TCP_OVERSIZE_DBGCHECK
this.oversize_left = seg.oversize_left;
#endif // TCP_OVERSIZE_DBGCHECK
#if TCP_CHECKSUM_ON_COPY
this.chksum = seg.chksum;
this.chksum_swapped = seg.chksum_swapped;
#endif // TCP_CHECKSUM_ON_COPY
this.flags = seg.flags;
this.tcphdr = seg.tcphdr;
}
/* Define some copy-macros for checksum-on-copy so that the code looks
nicer by preventing too many ifdef's. */
public static void TCP_DATA_COPY(pointer dst, pointer src, ushort len, tcp_seg seg)
{
do {
tcp_seg_add_chksum(lwip.LWIP_CHKSUM_COPY(dst, src, len),
len, ref seg.chksum, ref seg.chksum_swapped);
seg.flags |= tcp_seg.TF_SEG_DATA_CHECKSUMMED;
} while (false);
}
/**
* Called by tcp.tcp_output() to actually send a TCP segment over IP.
*
* @param seg the tcp_seg to send
* @param pcb the tcp_pcb for the TCP connection used to send the segment
*/
private void tcp_output_segment(tcp_seg seg, tcp_pcb pcb)
{
ushort len;
pointer opts;
/** @bug Exclude retransmitted segments from this count. */
//snmp.snmp_inc_tcpoutsegs();
/* The TCP header has already been constructed, but the ackno and
wnd fields remain. */
seg.tcphdr.ackno = lwip.lwip_htonl(pcb.rcv_nxt);
/* advertise our receive window size in this TCP segment */
seg.tcphdr.wnd = lwip.lwip_htons(pcb.rcv_ann_wnd);
pcb.rcv_ann_right_edge = pcb.rcv_nxt + pcb.rcv_ann_wnd;
/* Add any requested options. NB MSS option is only set on SYN
packets, so ignore it here */
opts = new pointer(seg.tcphdr.data, seg.tcphdr.offset + tcp_hdr.length);
if ((seg.flags & tcp_seg.TF_SEG_OPTS_MSS) != 0) {
ushort mss;
#if TCP_CALCULATE_EFF_SEND_MSS
mss = tcp_eff_send_mss(opt.TCP_MSS, pcb.remote_ip);
#else // TCP_CALCULATE_EFF_SEND_MSS
mss = opt.TCP_MSS;
#endif // TCP_CALCULATE_EFF_SEND_MSS
opts.SetValue(tcp_seg.TCP_BUILD_MSS_OPTION(mss));
opts += 1;
}
#if LWIP_TCP_TIMESTAMPS
pcb.ts_lastacksent = pcb.rcv_nxt;
if ((seg.flags & tcp_seg.TF_SEG_OPTS_TS) != 0) {
tcp_build_timestamp_option(pcb, /*opts*/new pointer(seg.tcphdr.data, seg.tcphdr.offset + 1));
opts += 3;
}
#endif
/* Set retransmission timer running if it is not currently enabled
This must be set before checking the route. */
if (pcb.rtime == -1) {
pcb.rtime = 0;
}
/* If we don't have a local IP address, we get one by
calling ip.ip_route(). */
if (ip_addr.ip_addr_isany(pcb.local_ip)) {
ip_addr.ip_addr_copy(pcb.local_ip, lwip.ip_addr);
}
if (pcb.rttest == 0) {
pcb.rttest = tcp_ticks;
pcb.rtseq = lwip.lwip_ntohl(seg.tcphdr.seqno);
lwip.LWIP_DEBUGF(opt.TCP_RTO_DEBUG, "tcp_output_segment: rtseq {0}\n", pcb.rtseq);
}
lwip.LWIP_DEBUGF(opt.TCP_OUTPUT_DEBUG, "tcp_output_segment: {0}:{1}\n",
lwip.lwip_htonl(seg.tcphdr.seqno), lwip.lwip_htonl(seg.tcphdr.seqno) +
seg.len);
len = (ushort)(seg.tcphdr - seg.p.payload);
seg.p.len -= len;
seg.p.tot_len -= len;
seg.p.payload = seg.tcphdr;
seg.tcphdr.chksum = 0;
#if CHECKSUM_GEN_TCP
#if TCP_CHECKSUM_ON_COPY
{
uint acc;
#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK
ushort chksum_slow = lwip.inet_chksum_pseudo(seg.p, pcb.local_ip,
pcb.remote_ip, lwip.IP_PROTO_TCP, seg.p.tot_len);
#endif // TCP_CHECKSUM_ON_COPY_SANITY_CHECK
if ((seg.flags & tcp_seg.TF_SEG_DATA_CHECKSUMMED) == 0) {
lwip.LWIP_ASSERT("data included but not checksummed",
seg.p.tot_len == (tcp_hdr.TCPH_HDRLEN(seg.tcphdr) * 4));
}
/* rebuild TCP header checksum (TCP header changes for retransmissions!) */
acc = lwip.inet_chksum_pseudo_partial(seg.p, pcb.local_ip,
pcb.remote_ip,
lwip.IP_PROTO_TCP, seg.p.tot_len, (ushort)(tcp_hdr.TCPH_HDRLEN(seg.tcphdr) * 4));
/* add payload checksum */
if (seg.chksum_swapped) {
seg.chksum = lwip.SWAP_BYTES_IN_WORD(seg.chksum);
seg.chksum_swapped = false;
}
acc += (ushort)~(seg.chksum);
seg.tcphdr.chksum = (ushort)lwip.FOLD_U32T(acc);
#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK
if (chksum_slow != seg.tcphdr.chksum) {
lwip.LWIP_DEBUGF(opt.TCP_DEBUG | lwip.LWIP_DBG_LEVEL_WARNING,
"tcp_output_segment: calculated checksum is {0} instead of {1:X}\n",
seg.tcphdr.chksum, chksum_slow);
seg.tcphdr.chksum = chksum_slow;
}
#endif // TCP_CHECKSUM_ON_COPY_SANITY_CHECK
}
#else // TCP_CHECKSUM_ON_COPY
seg.tcphdr.chksum = lwip.inet_chksum_pseudo(seg.p, pcb.local_ip,
pcb.remote_ip,
lwip.IP_PROTO_TCP, seg.p.tot_len);
#endif // TCP_CHECKSUM_ON_COPY
#endif // CHECKSUM_GEN_TCP
++lwip.lwip_stats.tcp.xmit;
#if LWIP_NETIF_HWADDRHINT
lwip.ip_output_hinted(seg.p, pcb.local_ip, pcb.remote_ip, pcb.ttl, pcb.tos,
lwip.IP_PROTO_TCP, pcb.addr_hint);
#else // LWIP_NETIF_HWADDRHINT
lwip.ip_output(seg.p, pcb.local_ip, pcb.remote_ip, pcb.ttl, pcb.tos,
lwip.IP_PROTO_TCP);
#endif // LWIP_NETIF_HWADDRHINT
}
public static void TCP_DATA_COPY(pointer dst, pointer src, int len, tcp_seg seg)
{
opt.MEMCPY(dst, src, len);
}
internal memp memp_malloc(memp_t type)
{
memp memp;
switch (type) {
#if LWIP_RAW
case memp_t.MEMP_RAW_PCB:
memp = new raw_pcb(this);
break;
#endif
#if LWIP_UDP
case memp_t.MEMP_UDP_PCB:
memp = new udp_pcb(this);
break;
#endif
#if LWIP_TCP
case memp_t.MEMP_TCP_PCB:
memp = new tcp_pcb(this);
break;
case memp_t.MEMP_TCP_PCB_LISTEN:
memp = new tcp_pcb_listen(this);
break;
case memp_t.MEMP_TCP_SEG:
memp = new tcp_seg(this);
break;
#endif
#if IP_REASSEMBLY
case memp_t.MEMP_REASSDATA:
memp = new ip_reassdata(this);
break;
case memp_t.MEMP_FRAG_PBUF:
memp = new frag_pbuf(this);
break;
#endif
#if LWIP_NETCONN
case memp_t.MEMP_NETBUF:
memp = new netbuf(this);
break;
case memp_t.MEMP_NETCONN:
memp = new netconn(this);
break;
#endif
#if false //!NO_SYS
case memp_t.MEMP_TCPIP_MSG_API:
memp = new tcpip_msg(this);
break;
case memp_t.MEMP_TCPIP_MSG_INPKT:
memp = new tcpip_msg(this);
break;
#endif
#if LWIP_ARP && ARP_QUEUEING
case memp_t.MEMP_ARP_QUEUE:
memp = new etharp_q_entry(this);
break;
#endif
#if LWIP_IGMP
case memp_t.MEMP_IGMP_GROUP:
memp = new igmp_group(this);
break;
#endif
#if false //(!NO_SYS || (NO_SYS && !NO_SYS_NO_TIMERS))
case memp_t.MEMP_SYS_TIMEOUT:
memp = new sys_timeo(this);
break;
#endif
#if LWIP_SNMP
case memp_t.MEMP_SNMP_ROOTNODE:
memp = new mib_list_rootnode(this);
break;
case memp_t.MEMP_SNMP_NODE:
memp = new mib_list_node(this);
break;
case memp_t.MEMP_SNMP_VARBIND:
memp = new snmp_varbind(this);
break;
case memp_t.MEMP_SNMP_VALUE:
memp = new snmp_value(this);
break;
#endif
#if LWIP_DNS && LWIP_SOCKET
case memp_t.MEMP_NETDB:
memp = new netdb(this);
break;
#endif
#if LWIP_DNS && DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC
case memp_t.MEMP_LOCALHOSTLIST:
memp = new local_hostlist_entry(this);
break;
#endif
#if PPP_SUPPORT && PPPOE_SUPPORT
case memp_t.MEMP_PPPOE_IF:
memp = new pppoe_softc(this);
break;
#endif
default:
throw new InvalidOperationException();
}
memp._type = type;
memp_heap.AddLast(memp);
return memp;
}
internal void copy_from(tcp_seg seg)
{
this.next = seg.next;
this.p = seg.p;
this.len = seg.len;
#if TCP_OVERSIZE_DBGCHECK
this.oversize_left = seg.oversize_left;
#endif // TCP_OVERSIZE_DBGCHECK
#if TCP_CHECKSUM_ON_COPY
this.chksum = seg.chksum;
this.chksum_swapped = seg.chksum_swapped;
#endif // TCP_CHECKSUM_ON_COPY
this.flags = seg.flags;
this.tcphdr = seg.tcphdr;
}
public static int TCP_TCPLEN(tcp_seg seg)
{
return seg.len + (((tcp_hdr.TCPH_FLAGS(seg.tcphdr) & (tcp.TCP_FIN | tcp.TCP_SYN)) != 0) ? 1 : 0);
}
/**
* Insert segment into the list (segments covered with new one will be deleted)
*
* Called from tcp_receive()
*/
private void tcp_oos_insert_segment(tcp_seg cseg, tcp_seg next)
{
tcp_seg old_seg;
if ((tcp_hdr.TCPH_FLAGS(cseg.tcphdr) & tcp.TCP_FIN) != 0) {
/* received segment overlaps all following segments */
tcp_segs_free(next);
next = null;
}
else {
/* delete some following segments
oos queue may have segments with FIN flag */
while ((next != null) &&
TCP_SEQ_GEQ((seqno + cseg.len),
(next.tcphdr.seqno + next.len))) {
/* cseg with FIN already processed */
if ((tcp_hdr.TCPH_FLAGS(next.tcphdr) & tcp.TCP_FIN) != 0) {
tcp_hdr.TCPH_SET_FLAG(cseg.tcphdr, tcp.TCP_FIN);
}
old_seg = next;
next = next.next;
tcp_seg_free(old_seg);
}
if ((next != null) &&
TCP_SEQ_GT(seqno + cseg.len, next.tcphdr.seqno)) {
/* We need to trim the incoming segment. */
cseg.len = (ushort)(next.tcphdr.seqno - seqno);
lwip.pbuf_realloc(cseg.p, cseg.len);
}
}
cseg.next = next;
}
public static int TCP_TCPLEN(tcp_seg seg)
{
return(seg.len + (((tcp_hdr.TCPH_FLAGS(seg.tcphdr) & (tcp.TCP_FIN | tcp.TCP_SYN)) != 0) ? 1 : 0));
}
internal memp memp_malloc(memp_t type)
{
memp memp;
switch (type)
{
#if LWIP_RAW
case memp_t.MEMP_RAW_PCB:
memp = new raw_pcb(this);
break;
#endif
#if LWIP_UDP
case memp_t.MEMP_UDP_PCB:
memp = new udp_pcb(this);
break;
#endif
#if LWIP_TCP
case memp_t.MEMP_TCP_PCB:
memp = new tcp_pcb(this);
break;
case memp_t.MEMP_TCP_PCB_LISTEN:
memp = new tcp_pcb_listen(this);
break;
case memp_t.MEMP_TCP_SEG:
memp = new tcp_seg(this);
break;
#endif
#if IP_REASSEMBLY
case memp_t.MEMP_REASSDATA:
memp = new ip_reassdata(this);
break;
case memp_t.MEMP_FRAG_PBUF:
memp = new frag_pbuf(this);
break;
#endif
#if LWIP_NETCONN
case memp_t.MEMP_NETBUF:
memp = new netbuf(this);
break;
case memp_t.MEMP_NETCONN:
memp = new netconn(this);
break;
#endif
#if false //!NO_SYS
case memp_t.MEMP_TCPIP_MSG_API:
memp = new tcpip_msg(this);
break;
case memp_t.MEMP_TCPIP_MSG_INPKT:
memp = new tcpip_msg(this);
break;
#endif
#if LWIP_ARP && ARP_QUEUEING
case memp_t.MEMP_ARP_QUEUE:
memp = new etharp_q_entry(this);
break;
#endif
#if LWIP_IGMP
case memp_t.MEMP_IGMP_GROUP:
memp = new igmp_group(this);
break;
#endif
#if false //(!NO_SYS || (NO_SYS && !NO_SYS_NO_TIMERS))
case memp_t.MEMP_SYS_TIMEOUT:
memp = new sys_timeo(this);
break;
#endif
#if LWIP_SNMP
case memp_t.MEMP_SNMP_ROOTNODE:
memp = new mib_list_rootnode(this);
break;
case memp_t.MEMP_SNMP_NODE:
memp = new mib_list_node(this);
break;
case memp_t.MEMP_SNMP_VARBIND:
memp = new snmp_varbind(this);
break;
case memp_t.MEMP_SNMP_VALUE:
memp = new snmp_value(this);
break;
#endif
#if LWIP_DNS && LWIP_SOCKET
case memp_t.MEMP_NETDB:
memp = new netdb(this);
break;
#endif
#if LWIP_DNS && DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC
case memp_t.MEMP_LOCALHOSTLIST:
memp = new local_hostlist_entry(this);
break;
#endif
#if PPP_SUPPORT && PPPOE_SUPPORT
case memp_t.MEMP_PPPOE_IF:
memp = new pppoe_softc(this);
break;
#endif
default:
throw new InvalidOperationException();
}
memp._type = type;
memp_heap.AddLast(memp);
return(memp);
}
public tcp(lwip lwip)
{
this.lwip = lwip;
inseg = new tcp_seg(lwip);
tcp_pcb_lists = new tcp_pcb_common[]{ tcp_listen_pcbs.pcbs, tcp_bound_pcbs,
tcp_active_pcbs, tcp_tw_pcbs};
}
