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tcp: bugfixes

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Matheus
2026-04-24 16:00:28 -03:00
parent a01940ac36
commit 6c88e67d97
1 changed files with 18 additions and 8 deletions
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kernel-src/io/net/tcp.c
+18 -8
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@@ -816,12 +816,19 @@ static uint32_t getsendmss(tcpheader_t *tcpheader, tcb_t *tcb) {
break;
} else if (*options == 1) { // nop
++options;
--optionslength;
continue;
} else if (*options == OPTIONS_MSS_KIND) {
options += 2;
newsendmss = be_to_cpu_w(*(uint16_t *)options);
if (optionslength < OPTIONS_MSS_LEN || options[1] != OPTIONS_MSS_LEN)
break;
newsendmss = be_to_cpu_w(*(uint16_t *)(options + 2));
break;
} else {
if (optionslength < 2 || options[1] < 2 || options[1] > optionslength)
break;
optionslength -= options[1];
options += options[1];
continue;
}
@@ -970,11 +977,11 @@ __attribute__((noreturn)) static void tcp_worker() {
newtcb->sndmss = mtu;
newtcb->sndmss = getsendmss(tcpheader, newtcb);
newtcb->iss = getrand32();
newtcb->rcvwindow = 0;
newtcb->sndnext = newtcb->iss;
newtcb->sndwindow = tcpheader->window;
newtcb->rcvmss = MSS_LIMIT(mtu);
newtcb->rcvnext = tcpheader->seq + 1;
newtcb->rcvwindow = tcpheader->window;
newtcb->rcvwindow = TCB_RINGBUFFER_SIZE;
newtcb->rcvurgent = 0;
newtcb->irs = tcpheader->seq;
@@ -1001,8 +1008,8 @@ __attribute__((noreturn)) static void tcp_worker() {
.mss = newtcb->rcvmss
};
tcb->retransmitpacketlen = sizeof(tcpheader_t) + sizeof(synoptions_t);
tcp_createheader(newtcb->retransmitbuffer, newtcb, tcb->retransmitpacketlen, &synoptions, sizeof(synoptions_t), CONTROL_SYN | CONTROL_ACK, 0);
newtcb->retransmitpacketlen = sizeof(tcpheader_t) + sizeof(synoptions_t);
tcp_createheader(newtcb->retransmitbuffer, newtcb, newtcb->retransmitpacketlen, &synoptions, sizeof(synoptions_t), CONTROL_SYN | CONTROL_ACK, 0);
// ugly hack but whatever, we only add options here and in connect.
synoptions_t *fixptr = (synoptions_t *)((uintptr_t)newtcb->retransmitbuffer + sizeof(tcpheader_t));
@@ -1010,9 +1017,10 @@ __attribute__((noreturn)) static void tcp_worker() {
newtcb->sndunack = newtcb->sndnext;
newtcb->sndnext += 1;
if (tcp_sendpacket(newtcb->retransmitbuffer, tcb->retransmitpacketlen, key.peer, self)) {
if (tcp_sendpacket(newtcb->retransmitbuffer, newtcb->retransmitpacketlen, key.peer, self)) {
// unset the tcb and wait for a SYN retransmission
tcp_reset(tcb);
newtcb->state = TCB_STATE_ABORT;
tcbset(newtcb, &key, true);
TCB_RELEASE(newtcb);
break;
}
@@ -1628,6 +1636,8 @@ static int tcp_listen(socket_t *socket, int backlog) {
TCB_HOLD(tcb); // for the release later
}
MUTEX_ACQUIRE(&tcb->mutex);
int error;
if (tcb->state != TCB_STATE_CLOSED) {
error = EINVAL;