return meshlink_forget_node(handle, node);
}
- /// Set the send buffer size of a channel.
- /** This function sets the desired size of the send buffer.
- * The default size is 128 kB.
- *
- * @param channel A handle for the channel.
- * @param size The desired size for the send buffer.
- * If a NULL pointer is given, the callback will be disabled.
- */
- void set_channel_sndbuf(channel *channel, size_t size) {
- meshlink_set_channel_sndbuf(handle, channel, size);
- }
-
- /// Set the receive buffer size of a channel.
- /** This function sets the desired size of the receive buffer.
- * The default size is 128 kB.
- *
- * @param channel A handle for the channel.
- * @param size The desired size for the send buffer.
- * If a NULL pointer is given, the callback will be disabled.
- */
- void set_channel_rcvbuf(channel *channel, size_t size) {
- meshlink_set_channel_rcvbuf(handle, channel, size);
- }
-
/// Set the flags of a channel.
/** This function allows changing some of the channel flags.
* Currently only MESHLINK_CHANNEL_NO_PARTIAL and MESHLINK_CHANNEL_DROP_LATE are supported, other flags are ignored.
meshlink_set_channel_flags(handle, channel, flags);
}
- /// Set the send buffer storage of a channel.
- /** This function provides MeshLink with a send buffer allocated by the application.
- *
- * @param channel A handle for the channel.
- * @param buf A pointer to the start of the buffer.
- * If a NULL pointer is given, MeshLink will use its own internal buffer again.
- * @param size The size of the buffer.
- */
- void set_channel_sndbuf_storage(channel *channel, void *buf, size_t size) {
- meshlink_set_channel_sndbuf_storage(handle, channel, buf, size);
- }
-
- /// Set the receive buffer storage of a channel.
- /** This function provides MeshLink with a receive buffer allocated by the application.
- *
- * @param channel A handle for the channel.
- * @param buf A pointer to the start of the buffer.
- * If a NULL pointer is given, MeshLink will use its own internal buffer again.
- * @param size The size of the buffer.
- */
- void set_channel_rcvbuf_storage(channel *channel, void *buf, size_t size) {
- meshlink_set_channel_rcvbuf_storage(handle, channel, buf, size);
- }
-
/// Set the connection timeout used for channels to the given node.
/** This sets the timeout after which unresponsive channels will be reported as closed.
* The timeout is set for all current and future channels to the given node.
return meshlink_channel_send(handle, channel, data, len);
}
- /// Get the amount of bytes in the send buffer.
- /** This returns the amount of bytes in the send buffer.
- * These bytes have not been received by the peer yet.
- *
- * @param channel A handle for the channel.
- *
- * @return The amount of un-ACKed bytes in the send buffer.
- */
- size_t channel_get_sendq(channel *channel) {
- return meshlink_channel_get_sendq(handle, channel);
- }
-
- /// Get the amount of bytes in the receive buffer.
- /** This returns the amount of bytes in the receive buffer.
- * These bytes have not been processed by the application yet.
- *
- * @param channel A handle for the channel.
- *
- * @return The amount of bytes in the receive buffer.
- */
- size_t channel_get_recvq(channel *channel) {
- return meshlink_channel_get_recvq(handle, channel);
- }
-
/// Get the maximum segment size of a channel.
/** This returns the amount of bytes that can be sent at once for channels with UDP semantics.
*
*/
void meshlink_set_channel_receive_cb(struct meshlink_handle *mesh, struct meshlink_channel *channel, meshlink_channel_receive_cb_t cb);
-/// Set the poll callback.
-/** This functions sets the callback that is called whenever data can be sent to another node.
- * The callback is run in MeshLink's own thread.
- * It is therefore important that the callback uses apprioriate methods (queues, pipes, locking, etc.)
- * to pass data to or from the application's thread.
- * The callback should also not block itself and return as quickly as possible.
- *
- * \memberof meshlink_channel
- * @param mesh A handle which represents an instance of MeshLink.
- * @param channel A handle for the channel.
- * @param cb A pointer to the function which will be called when data can be sent to another node.
- * If a NULL pointer is given, the callback will be disabled.
- */
-void meshlink_set_channel_poll_cb(struct meshlink_handle *mesh, struct meshlink_channel *channel, meshlink_channel_poll_cb_t cb);
-
-/// Set the send buffer size of a channel.
-/** This function sets the desired size of the send buffer.
- * The default size is 128 kB.
- *
- * \memberof meshlink_channel
- * @param mesh A handle which represents an instance of MeshLink.
- * @param channel A handle for the channel.
- * @param size The desired size for the send buffer.
- */
-void meshlink_set_channel_sndbuf(struct meshlink_handle *mesh, struct meshlink_channel *channel, size_t size);
-
-/// Set the receive buffer size of a channel.
-/** This function sets the desired size of the receive buffer.
- * The default size is 128 kB.
- *
- * \memberof meshlink_channel
- * @param mesh A handle which represents an instance of MeshLink.
- * @param channel A handle for the channel.
- * @param size The desired size for the send buffer.
- */
-void meshlink_set_channel_rcvbuf(struct meshlink_handle *mesh, struct meshlink_channel *channel, size_t size);
-
-/// Set the send buffer storage of a channel.
-/** This function provides MeshLink with a send buffer allocated by the application.
- * The buffer must be valid until the channel is closed or until this function is called again with a NULL pointer for @a buf.
- *
- * \memberof meshlink_channel
- * @param mesh A handle which represents an instance of MeshLink.
- * @param channel A handle for the channel.
- * @param buf A pointer to the start of the buffer.
- * If a NULL pointer is given, MeshLink will use its own internal buffer again.
- * @param size The size of the buffer.
- */
-void meshlink_set_channel_sndbuf_storage(struct meshlink_handle *mesh, struct meshlink_channel *channel, void *buf, size_t size);
-
-/// Set the receive buffer storage of a channel.
-/** This function provides MeshLink with a receive buffer allocated by the application.
- * The buffer must be valid until the channel is closed or until this function is called again with a NULL pointer for @a buf.
- *
- * \memberof meshlink_channel
- * @param mesh A handle which represents an instance of MeshLink.
- * @param channel A handle for the channel.
- * @param buf A pointer to the start of the buffer.
- * If a NULL pointer is given, MeshLink will use its own internal buffer again.
- * @param size The size of the buffer.
- */
-void meshlink_set_channel_rcvbuf_storage(struct meshlink_handle *mesh, struct meshlink_channel *channel, void *buf, size_t size);
-
/// Set the flags of a channel.
/** This function allows changing some of the channel flags.
* Currently only MESHLINK_CHANNEL_NO_PARTIAL and MESHLINK_CHANNEL_DROP_LATE are supported, other flags are ignored.
*/
uint32_t meshlink_channel_get_flags(struct meshlink_handle *mesh, struct meshlink_channel *channel) __attribute__((__warn_unused_result__));
-/// Get the amount of bytes in the send buffer.
-/** This returns the amount of bytes in the send buffer.
- * These bytes have not been received by the peer yet.
- *
- * \memberof meshlink_channel
- * @param mesh A handle which represents an instance of MeshLink.
- * @param channel A handle for the channel.
- *
- * @return The amount of un-ACKed bytes in the send buffer.
- */
-size_t meshlink_channel_get_sendq(struct meshlink_handle *mesh, struct meshlink_channel *channel) __attribute__((__warn_unused_result__));
-
-/// Get the amount of bytes in the receive buffer.
-/** This returns the amount of bytes in the receive buffer.
- * These bytes have not been processed by the application yet.
- *
- * \memberof meshlink_channel
- * @param mesh A handle which represents an instance of MeshLink.
- * @param channel A handle for the channel.
- *
- * @return The amount of bytes in the receive buffer.
- */
-size_t meshlink_channel_get_recvq(struct meshlink_handle *mesh, struct meshlink_channel *channel) __attribute__((__warn_unused_result__));
-
/// Get the maximum segment size of a channel.
/** This returns the amount of bytes that can be sent at once for channels with UDP semantics.
*
pthread_mutex_unlock(&mesh->mutex);
}
-void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
- logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf(%p, %zu)", (void *)channel, size);
-
- meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size);
-}
-
-void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
- logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf(%p, %zu)", (void *)channel, size);
-
- meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size);
-}
-
-void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
- logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
-
- if(!mesh || !channel) {
- meshlink_errno = MESHLINK_EINVAL;
- return;
- }
-
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
- }
-
- utcp_set_sndbuf(channel->c, buf, size);
- pthread_mutex_unlock(&mesh->mutex);
-}
-
-void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
- logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
-
- if(!mesh || !channel) {
- meshlink_errno = MESHLINK_EINVAL;
- return;
- }
-
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
- }
-
- utcp_set_rcvbuf(channel->c, buf, size);
- pthread_mutex_unlock(&mesh->mutex);
-}
-
void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) {
logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_flags(%p, %u)", (void *)channel, flags);
return channel->c->flags;
}
-size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
- if(!mesh || !channel) {
- meshlink_errno = MESHLINK_EINVAL;
- return -1;
- }
-
- return utcp_get_sendq(channel->c);
-}
-
-size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
- if(!mesh || !channel) {
- meshlink_errno = MESHLINK_EINVAL;
- return -1;
- }
-
- return utcp_get_recvq(channel->c);
-}
-
size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
if(!mesh || !channel) {
meshlink_errno = MESHLINK_EINVAL;
meshlink_channel_close
meshlink_channel_get_flags
meshlink_channel_get_mss
-meshlink_channel_get_recvq
-meshlink_channel_get_sendq
meshlink_channel_open_ex
meshlink_channel_send
meshlink_channel_shutdown
meshlink_set_channel_accept_cb
meshlink_set_channel_flags
meshlink_set_channel_listen_cb
-meshlink_set_channel_rcvbuf
-meshlink_set_channel_rcvbuf_storage
meshlink_set_channel_receive_cb
-meshlink_set_channel_sndbuf
-meshlink_set_channel_sndbuf_storage
meshlink_set_connection_try_cb
meshlink_set_dev_class_fast_retry_period
meshlink_set_dev_class_maxtimeout
return a - b;
}
-// Buffer functions
-static bool buffer_wraps(struct buffer *buf) {
- return buf->size - buf->offset < buf->used;
-}
-
-static bool buffer_resize(struct buffer *buf, uint32_t newsize) {
- assert(!buf->external);
-
- if(!newsize) {
- free(buf->data);
- buf->data = NULL;
- buf->size = 0;
- buf->offset = 0;
- return true;
- }
-
- char *newdata = realloc(buf->data, newsize);
-
- if(!newdata) {
- return false;
- }
-
- buf->data = newdata;
-
- if(buffer_wraps(buf)) {
- // Shift the right part of the buffer until it hits the end of the new buffer.
- // Old situation:
- // [345......012]
- // New situation:
- // [345.........|........012]
- uint32_t tailsize = buf->size - buf->offset;
- uint32_t newoffset = newsize - tailsize;
- memmove(buf->data + newoffset, buf->data + buf->offset, tailsize);
- buf->offset = newoffset;
- }
-
- buf->size = newsize;
- return true;
-}
-
-// Store data into the buffer
-static ssize_t buffer_put_at(struct buffer *buf, size_t offset, const void *data, size_t len) {
- debug(NULL, "buffer_put_at %lu %lu %lu\n", (unsigned long)buf->used, (unsigned long)offset, (unsigned long)len);
-
- // Ensure we don't store more than maxsize bytes in total
- size_t required = offset + len;
-
- if(required > buf->maxsize) {
- if(offset >= buf->maxsize) {
- return 0;
- }
-
- len = buf->maxsize - offset;
- required = buf->maxsize;
- }
-
- // Check if we need to resize the buffer
- if(required > buf->size) {
- size_t newsize = buf->size;
-
- if(!newsize) {
- newsize = 4096;
- }
-
- do {
- newsize *= 2;
- } while(newsize < required);
-
- if(newsize > buf->maxsize) {
- newsize = buf->maxsize;
- }
-
- if(!buffer_resize(buf, newsize)) {
- return -1;
- }
- }
-
- uint32_t realoffset = buf->offset + offset;
-
- if(buf->size - buf->offset <= offset) {
- // The offset wrapped
- realoffset -= buf->size;
- }
-
- if(buf->size - realoffset < len) {
- // The new chunk of data must be wrapped
- memcpy(buf->data + realoffset, data, buf->size - realoffset);
- memcpy(buf->data, (char *)data + buf->size - realoffset, len - (buf->size - realoffset));
- } else {
- memcpy(buf->data + realoffset, data, len);
- }
-
- if(required > buf->used) {
- buf->used = required;
- }
-
- return len;
-}
-
-static ssize_t buffer_put(struct buffer *buf, const void *data, size_t len) {
- return buffer_put_at(buf, buf->used, data, len);
-}
-
-// Copy data from the buffer without removing it.
-static ssize_t buffer_copy(struct buffer *buf, void *data, size_t offset, size_t len) {
- // Ensure we don't copy more than is actually stored in the buffer
- if(offset >= buf->used) {
- return 0;
- }
-
- if(buf->used - offset < len) {
- len = buf->used - offset;
- }
-
- uint32_t realoffset = buf->offset + offset;
-
- if(buf->size - buf->offset <= offset) {
- // The offset wrapped
- realoffset -= buf->size;
- }
-
- if(buf->size - realoffset < len) {
- // The data is wrapped
- memcpy(data, buf->data + realoffset, buf->size - realoffset);
- memcpy((char *)data + buf->size - realoffset, buf->data, len - (buf->size - realoffset));
- } else {
- memcpy(data, buf->data + realoffset, len);
- }
-
- return len;
-}
-
-// Discard data from the buffer.
-static ssize_t buffer_discard(struct buffer *buf, size_t len) {
- if(buf->used < len) {
- len = buf->used;
- }
-
- if(buf->size - buf->offset <= len) {
- buf->offset -= buf->size;
- }
-
- if(buf->used == len) {
- buf->offset = 0;
- } else {
- buf->offset += len;
- }
-
- buf->used -= len;
-
- return len;
-}
-
-static void buffer_clear(struct buffer *buf) {
- buf->used = 0;
- buf->offset = 0;
-}
-
-static bool buffer_set_size(struct buffer *buf, uint32_t minsize, uint32_t maxsize) {
- if(maxsize < minsize) {
- maxsize = minsize;
- }
-
- buf->maxsize = maxsize;
-
- return buf->size >= minsize || buffer_resize(buf, minsize);
-}
-
-static void buffer_transfer(struct buffer *buf, char *newdata, size_t newsize) {
- if(buffer_wraps(buf)) {
- // Old situation:
- // [345......012]
- // New situation:
- // [012345......]
- uint32_t tailsize = buf->size - buf->offset;
- memcpy(newdata, buf->data + buf->offset, tailsize);
- memcpy(newdata + tailsize, buf->data, buf->used - tailsize);
- } else {
- // Old situation:
- // [....012345..]
- // New situation:
- // [012345......]
- memcpy(newdata, buf->data + buf->offset, buf->used);
- }
-
- buf->offset = 0;
- buf->size = newsize;
-}
-
-static void set_buffer_storage(struct buffer *buf, char *data, size_t size) {
- if(size > UINT32_MAX) {
- size = UINT32_MAX;
- }
-
- buf->maxsize = size;
-
- if(data) {
- if(buf->external) {
- // Don't allow resizing an external buffer
- abort();
- }
-
- if(size < buf->used) {
- // Ignore requests for an external buffer if we are already using more than it can store
- return;
- }
-
- // Transition from internal to external buffer
- buffer_transfer(buf, data, size);
- free(buf->data);
- buf->data = data;
- buf->external = true;
- } else if(buf->external) {
- // Transition from external to internal buf
- size_t minsize = buf->used <= DEFAULT_SNDBUFSIZE ? DEFAULT_SNDBUFSIZE : buf->used;
-
- if(minsize) {
- data = malloc(minsize);
-
- if(!data) {
- // Cannot handle this
- abort();
- }
-
- buffer_transfer(buf, data, minsize);
- buf->data = data;
- } else {
- buf->data = NULL;
- buf->size = 0;
- }
-
- buf->external = false;
- } else {
- // Don't do anything if the buffer wraps
- if(buffer_wraps(buf)) {
- return;
- }
-
- // Realloc internal storage
- size_t minsize = max(DEFAULT_SNDBUFSIZE, buf->offset + buf->used);
-
- if(minsize) {
- data = realloc(buf->data, minsize);
-
- if(data) {
- buf->data = data;
- buf->size = minsize;
- }
- } else {
- free(buf->data);
- buf->data = NULL;
- buf->size = 0;
- }
- }
-}
-
-static void buffer_exit(struct buffer *buf) {
- if(!buf->external) {
- free(buf->data);
- }
-
- memset(buf, 0, sizeof(*buf));
-}
-
-static uint32_t buffer_free(const struct buffer *buf) {
- return buf->maxsize > buf->used ? buf->maxsize - buf->used : 0;
-}
-
// Connections are stored in a sorted list.
// This gives O(log(N)) lookup time, O(N log(N)) insertion time and O(N) deletion time.
memmove(cp, cp + 1, (utcp->nconnections - i - 1) * sizeof(*cp));
utcp->nconnections--;
- buffer_exit(&c->rcvbuf);
- buffer_exit(&c->sndbuf);
free(c);
}
return NULL;
}
- if(!buffer_set_size(&c->sndbuf, DEFAULT_SNDBUFSIZE, DEFAULT_MAXSNDBUFSIZE)) {
- free(c);
- return NULL;
- }
-
- if(!buffer_set_size(&c->rcvbuf, DEFAULT_RCVBUFSIZE, DEFAULT_MAXRCVBUFSIZE)) {
- buffer_exit(&c->sndbuf);
- free(c);
- return NULL;
- }
-
// Fill in the details
c->src = src;
pkt.hdr.dst = c->dst;
pkt.hdr.seq = c->snd.iss;
pkt.hdr.ack = 0;
- pkt.hdr.wnd = c->rcvbuf.maxsize;
+ pkt.hdr.wnd = c->utcp->mtu;
pkt.hdr.ctl = SYN;
pkt.hdr.aux = 0x0101;
pkt.init[0] = 1;
set_state(c, ESTABLISHED);
}
-static void ack(struct utcp_connection *c, bool sendatleastone) {
- int32_t left = seqdiff(c->snd.last, c->snd.nxt);
- int32_t cwndleft = MAX_UNRELIABLE_SIZE;
-
- assert(left >= 0);
-
- if(cwndleft <= 0) {
- left = 0;
- } else if(cwndleft < left) {
- left = cwndleft;
-
- if(!sendatleastone || cwndleft > c->utcp->mss) {
- left -= left % c->utcp->mss;
- }
- }
-
- debug(c, "cwndleft %d left %d\n", cwndleft, left);
-
- if(!left && !sendatleastone) {
- return;
- }
-
+static void ack(struct utcp_connection *c, const void *data, size_t len) {
struct {
struct hdr hdr;
uint8_t data[];
pkt->hdr.ctl = ACK;
pkt->hdr.aux = 0;
- do {
- uint32_t seglen = left > c->utcp->mss ? c->utcp->mss : left;
- pkt->hdr.seq = c->snd.nxt;
-
- buffer_copy(&c->sndbuf, pkt->data, seqdiff(c->snd.nxt, c->snd.una), seglen);
+ uint32_t seglen = len;
+ pkt->hdr.seq = c->snd.nxt;
- c->snd.nxt += seglen;
- left -= seglen;
+ c->snd.nxt += seglen;
- if(seglen && fin_wanted(c, c->snd.nxt)) {
- seglen--;
- pkt->hdr.ctl |= FIN;
- }
+ if(fin_wanted(c, c->snd.nxt)) {
+ pkt->hdr.ctl |= FIN;
+ }
- if(!c->rtt_start.tv_sec) {
- // Start RTT measurement
- clock_gettime(UTCP_CLOCK, &c->rtt_start);
- c->rtt_seq = pkt->hdr.seq + seglen;
- debug(c, "starting RTT measurement, expecting ack %u\n", c->rtt_seq);
- }
+ if(data && len) {
+ assert(len <= c->utcp->mtu);
+ memcpy(pkt->data, data, len);
+ } else {
+ assert(!data && !len);
+ }
- print_packet(c, "send", pkt, sizeof(pkt->hdr) + seglen);
- c->utcp->send(c->utcp, pkt, sizeof(pkt->hdr) + seglen);
+ if(!c->rtt_start.tv_sec) {
+ // Start RTT measurement
+ clock_gettime(UTCP_CLOCK, &c->rtt_start);
+ c->rtt_seq = pkt->hdr.seq + seglen;
+ debug(c, "starting RTT measurement, expecting ack %u\n", c->rtt_seq);
+ }
- if(left) {
- pkt->hdr.wnd += seglen;
- }
- } while(left);
+ print_packet(c, "send", pkt, sizeof(pkt->hdr) + seglen);
+ c->utcp->send(c->utcp, pkt, sizeof(pkt->hdr) + seglen);
}
ssize_t utcp_send(struct utcp_connection *c, const void *data, size_t len) {
return -1;
}
- // Add data to send buffer.
-
- if(c->state != SYN_SENT && c->state != SYN_RECEIVED) {
- if(len > MAX_UNRELIABLE_SIZE || buffer_put(&c->sndbuf, data, len) != (ssize_t)len) {
- errno = EMSGSIZE;
- return -1;
- }
- } else {
- return 0;
+ if(len > MAX_UNRELIABLE_SIZE || len > c->utcp->mtu) {
+ errno = EMSGSIZE;
+ return -1;
}
if(len <= 0) {
return len;
}
- ack(c, false);
+ ack(c, data, len);
c->snd.una = c->snd.nxt = c->snd.last;
- buffer_discard(&c->sndbuf, c->sndbuf.used);
return len;
}
pkt->hdr.src = c->src;
pkt->hdr.dst = c->dst;
- pkt->hdr.wnd = c->rcvbuf.maxsize;
+ pkt->hdr.wnd = c->utcp->mtu;
pkt->hdr.aux = 0;
switch(c->state) {
ptr += 2;
}
- bool has_data = len || (hdr.ctl & (SYN | FIN));
-
// Is it for a new connection?
if(!c) {
pkt.hdr.dst = c->dst;
pkt.hdr.ack = c->rcv.irs + 1;
pkt.hdr.seq = c->snd.iss;
- pkt.hdr.wnd = c->rcvbuf.maxsize;
+ pkt.hdr.wnd = c->utcp->mtu;
pkt.hdr.ctl = SYN | ACK;
if(init) {
// The peer has aborted our connection.
set_state(c, CLOSED);
errno = ECONNRESET;
- buffer_clear(&c->sndbuf);
- buffer_clear(&c->rcvbuf);
if(c->recv) {
c->recv(c, NULL, 0);
assert(data_acked <= bufused);
#endif
- if(data_acked) {
- buffer_discard(&c->sndbuf, data_acked);
- }
-
// Also advance snd.nxt if possible
if(seqdiff(c->snd.nxt, hdr.ack) < 0) {
c->snd.nxt = hdr.ack;
c->snd.cwnd += max(1, (utcp->mss * utcp->mss) / c->snd.cwnd); // eq. 3
}
- if(c->snd.cwnd > c->sndbuf.maxsize) {
- c->snd.cwnd = c->sndbuf.maxsize;
+ if(c->snd.cwnd > c->utcp->mtu) {
+ c->snd.cwnd = c->utcp->mtu;
}
debug_cwnd(c);
// -> sendatleastone = false
if(hdr.ctl & SYN || hdr.ctl & FIN) {
- ack(c, has_data);
+ ack(c, NULL, 0);
}
return 0;
c->snd.last++;
- ack(c, false);
+ ack(c, NULL, 0);
if(!timespec_isset(&c->rtrx_timeout)) {
start_retransmit_timer(c);
return false;
}
- buffer_clear(&c->sndbuf);
- buffer_clear(&c->rcvbuf);
-
switch(c->state) {
case CLOSED:
return true;
}
static void set_reapable(struct utcp_connection *c) {
- set_buffer_storage(&c->sndbuf, NULL, min(c->sndbuf.maxsize, DEFAULT_MAXSNDBUFSIZE));
- set_buffer_storage(&c->rcvbuf, NULL, min(c->rcvbuf.maxsize, DEFAULT_MAXRCVBUFSIZE));
-
c->recv = NULL;
c->reapable = true;
}
if(timespec_isset(&c->conn_timeout) && timespec_lt(&c->conn_timeout, &now)) {
errno = ETIMEDOUT;
c->state = CLOSED;
- buffer_clear(&c->sndbuf);
- buffer_clear(&c->rcvbuf);
if(c->recv) {
c->recv(c, NULL, 0);
struct utcp_connection *c = utcp->connections[i];
if(!c->reapable) {
- buffer_clear(&c->sndbuf);
- buffer_clear(&c->rcvbuf);
-
if(c->recv) {
c->recv(c, NULL, 0);
}
}
- buffer_exit(&c->rcvbuf);
- buffer_exit(&c->sndbuf);
free(c);
}
}
}
-size_t utcp_get_sndbuf(struct utcp_connection *c) {
- return c ? c->sndbuf.maxsize : 0;
-}
-
-size_t utcp_get_sndbuf_free(struct utcp_connection *c) {
- if(!c) {
- return 0;
- }
-
- switch(c->state) {
- case SYN_SENT:
- case SYN_RECEIVED:
- case ESTABLISHED:
- case CLOSE_WAIT:
- return buffer_free(&c->sndbuf);
-
- default:
- return 0;
- }
-}
-
-void utcp_set_sndbuf(struct utcp_connection *c, void *data, size_t size) {
- if(!c) {
- return;
- }
-
- set_buffer_storage(&c->sndbuf, data, size);
-}
-
-size_t utcp_get_rcvbuf(struct utcp_connection *c) {
- return c ? c->rcvbuf.maxsize : 0;
-}
-
-size_t utcp_get_rcvbuf_free(struct utcp_connection *c) {
- if(c && (c->state == ESTABLISHED || c->state == CLOSE_WAIT)) {
- return buffer_free(&c->rcvbuf);
- } else {
- return 0;
- }
-}
-
-void utcp_set_rcvbuf(struct utcp_connection *c, void *data, size_t size) {
- if(!c) {
- return;
- }
-
- set_buffer_storage(&c->rcvbuf, data, size);
-}
-
-size_t utcp_get_sendq(struct utcp_connection *c) {
- return c->sndbuf.used;
-}
-
-size_t utcp_get_recvq(struct utcp_connection *c) {
- return c->rcvbuf.used;
-}
-
bool utcp_get_nodelay(struct utcp_connection *c) {
return c ? c->nodelay : false;
}
}
}
-size_t utcp_get_outq(struct utcp_connection *c) {
- return c ? seqdiff(c->snd.nxt, c->snd.una) : 0;
-}
-
void utcp_set_recv_cb(struct utcp_connection *c, utcp_recv_t recv) {
if(c) {
c->recv = recv;
// Per-socket options
-size_t utcp_get_sndbuf(struct utcp_connection *connection);
-void utcp_set_sndbuf(struct utcp_connection *connection, void *buf, size_t size);
-size_t utcp_get_sndbuf_free(struct utcp_connection *connection);
-
-size_t utcp_get_rcvbuf(struct utcp_connection *connection);
-void utcp_set_rcvbuf(struct utcp_connection *connection, void *buf, size_t size);
-size_t utcp_get_rcvbuf_free(struct utcp_connection *connection);
-
-size_t utcp_get_sendq(struct utcp_connection *connection);
-size_t utcp_get_recvq(struct utcp_connection *connection);
-
bool utcp_get_nodelay(struct utcp_connection *connection);
void utcp_set_nodelay(struct utcp_connection *connection, bool nodelay);
bool utcp_get_keepalive(struct utcp_connection *connection);
void utcp_set_keepalive(struct utcp_connection *connection, bool keepalive);
-size_t utcp_get_outq(struct utcp_connection *connection);
-
void utcp_expect_data(struct utcp_connection *connection, bool expect);
void utcp_set_flags(struct utcp_connection *connection, uint32_t flags);
#define AUX_SAK 3
#define AUX_TIMESTAMP 4
-#define DEFAULT_SNDBUFSIZE 0
-#define DEFAULT_MAXSNDBUFSIZE 131072
-#define DEFAULT_RCVBUFSIZE 0
-#define DEFAULT_MAXRCVBUFSIZE 131072
-
#define MAX_UNRELIABLE_SIZE 16777215
#define DEFAULT_MTU 1000
[TIME_WAIT] = "TIME_WAIT"
};
-struct buffer {
- char *data;
- uint32_t offset;
- uint32_t used;
- uint32_t size;
- uint32_t maxsize;
- bool external;
-};
-
struct utcp_connection {
void *priv;
struct utcp *utcp;
uint32_t rttvar; // usec
uint32_t rto; // usec
- // Buffers
-
- uint32_t prev_free;
- struct buffer sndbuf;
- struct buffer rcvbuf;
-
// Per-socket options
bool nodelay;
projects / meshlink-tiny / commitdiff