mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-25 02:55:15 +00:00
Added clear, reset and number of fragments to be sent; better debugging
This commit is contained in:
frekky
parent
33525e5086
commit
bd9966836e
105
src/window.c
105
src/window.c
@ -25,6 +25,8 @@
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#include "common.h"
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#include "window.h"
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int window_debug = 0;
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struct frag_buffer *
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window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int dir)
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{
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@ -53,6 +55,20 @@ window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int di
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return buf;
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}
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void
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window_buffer_reset(struct frag_buffer *w)
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{
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w->chunk_start = 0;
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w->cur_seq_id = 0;
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w->last_write = 0;
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w->numitems = 0;
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w->oos = 0;
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w->resends = 0;
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w->start_seq_id = 0;
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w->window_start = 0;
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w->window_end = AFTER(w, w->windowsize);
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}
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void
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window_buffer_resize(struct frag_buffer *w, size_t length)
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{
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@ -66,11 +82,7 @@ window_buffer_resize(struct frag_buffer *w, size_t length)
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errx(1, "Failed to resize window buffer!");
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}
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w->length = length;
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w->numitems = 0;
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w->window_start = 0;
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w->start_seq_id = 0;
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w->cur_seq_id = 0;
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w->window_end = AFTER(w, w->windowsize);
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window_buffer_reset(w);
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}
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void
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@ -81,6 +93,15 @@ window_buffer_destroy(struct frag_buffer *w)
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free(w);
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}
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void
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window_buffer_clear(struct frag_buffer *w)
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{
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if (!w) return;
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memset(w->frags, 0, w->length * sizeof(fragment));
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window_buffer_reset(w);
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}
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/* Returns number of available fragment slots (NOT BYTES) */
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size_t
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window_buffer_available(struct frag_buffer *w)
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@ -99,7 +120,8 @@ window_append_fragment(struct frag_buffer *w, fragment *src)
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return 1;
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}
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/* Handles fragment received from the sending side (RECV) */
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/* Handles fragment received from the sending side (RECV)
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* Returns seq ID of packet to be ACKed immediately */
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int
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window_process_incoming_fragment(struct frag_buffer *w, fragment *f)
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{
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@ -109,8 +131,11 @@ window_process_incoming_fragment(struct frag_buffer *w, fragment *f)
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startid = w->start_seq_id;
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endid = (w->start_seq_id + w->windowsize) % MAX_SEQ_ID;
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if (!INWINDOW_SEQ(startid, endid, f->seqID)) {
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DEBUG("Dropping frag with seqID %u: not in window (%u-%u)\n", f->seqID, startid, endid);
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return 0;
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DEBUG("Dropping frag with seqID %u: not in window (%u-%u)\n",
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f->seqID, startid, endid);
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w->oos++;
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/* ACK duplicate so sender can move on ASAP */
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return f->seqID;
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}
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/* Place fragment into correct location in buffer */
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size_t dest = WRAP(w->window_start + SEQ_OFFSET(startid, f->seqID));
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@ -119,14 +144,17 @@ window_process_incoming_fragment(struct frag_buffer *w, fragment *f)
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fd = &w->frags[dest];
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if (fd->len != 0) {
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DEBUG("Received duplicate frag, dropping. (prev %u/new %u)", fd->seqID, f->seqID);
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return 0;
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if (f->seqID == fd->seqID)
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return f->seqID;
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}
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memcpy(fd, f, sizeof(fragment));
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fd->retries = 0;
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fd->ack_other = -1;
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fd->acks = 0;
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/* We assume this packet gets ACKed immediately on return of this function */
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fd->acks = 1;
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w->numitems ++;
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return 1;
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return f->seqID;
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}
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/* Reassembles first complete sequence of fragments into data. (RECV)
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@ -139,7 +167,7 @@ window_reassemble_data(struct frag_buffer *w, uint8_t *data, size_t maxlen, int
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dest = data;
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if (w->direction != WINDOW_RECVING)
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return 0;
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if (w->frags[w->chunk_start].start == 0) {
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if (w->frags[w->chunk_start].start == 0 && w->numitems > 0) {
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DEBUG("chunk_start (%lu)pointing to non-start fragment (seq %u, len %lu)!",
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w->chunk_start, w->frags[w->chunk_start].seqID, w->frags[w->chunk_start].len);
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return 0;
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@ -191,29 +219,50 @@ window_reassemble_data(struct frag_buffer *w, uint8_t *data, size_t maxlen, int
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if (end == 0) { /* no end of chunk found but reached end of data */
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return 0;
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}
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DEBUG("Reassembling %lu bytes of data from %lu frags!", datalen, i + 1);
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DEBUG("Reassembling %lu bytes of data from %lu frags; compression %d!", datalen, i + 1, *compression);
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/* Clear all used fragments */
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size_t p;
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ITER_FORWARD(w->chunk_start, WRAP(w->chunk_start + i + 1), w->length, p, {
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memset(&w->frags[p], 0, sizeof(fragment));
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});
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ITER_FORWARD(w->chunk_start, WRAP(w->chunk_start + i + 1), w->length, p,
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memset(&w->frags[p], 0, sizeof(fragment));
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);
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w->chunk_start = WRAP(woffs + 1);
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w->numitems -= i + 1;
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return datalen;
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}
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/* Returns number of fragments that can be sent immediately; effectively
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* the same as window_get_next_sending_fragment but without changing anything. */
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int
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window_sending(struct frag_buffer *w)
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{
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fragment *f;
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int tosend = 0;
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if (w->numitems == 0)
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return 0;
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for (size_t i = 0; i < w->windowsize; i++) {
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f = &w->frags[WRAP(w->window_start + i)];
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if (f->len == 0 || f->acks >= 1) continue;
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if ((f->retries == 0) != (difftime(time(NULL), f->lastsent) > ACK_TIMEOUT)) {
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/* Fragment not sent xor timed out (to be re-sent) */
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tosend++;
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}
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}
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return tosend;
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}
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/* Returns next fragment to be sent or NULL if nothing (SEND)
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* This also handles packet resends, timeouts etc. */
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fragment *
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window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack)
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{
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fragment *f;
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fragment *f = NULL;
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if (*other_ack >= MAX_SEQ_ID || *other_ack < 0)
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*other_ack = -1;
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for (size_t i = 0; i < w->windowsize; i++) {
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f = &w->frags[WRAP(w->window_start + i)];
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if (f->acks >= 1) continue;
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if (f->retries >= 1 && difftime(f->lastsent, time(NULL)) > ACK_TIMEOUT) {
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/* TODO: use timeval for more precise timeouts */
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if (f->retries >= 1 && difftime(time(NULL), f->lastsent) > ACK_TIMEOUT) {
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/* Fragment sent before, not ACK'd */
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DEBUG("Sending fragment %u again, %u retries so far, %u resent overall\n", f->seqID, f->retries, w->resends);
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w->resends ++;
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@ -224,16 +273,16 @@ window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack)
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}
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}
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DEBUG("Not sending any fragments (last frag checked: retries %u, seqid %u, len %lu)",
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f->retries, f->seqID, f->len);
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// TODO: statistics for packet loss/not sending etc
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if (f)
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DEBUG("Not sending any fragments (last frag checked: retries %u, seqid %u, len %lu)",
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f->retries, f->seqID, f->len);
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return NULL;
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found:
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/* store other ACK into fragment so ACK is resent if fragment times out */
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if (f->ack_other == -1)
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f->ack_other = *other_ack, *other_ack = -1;
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f->is_nack &= 1;
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/* store other ACK into fragment for sending; ignore any previous values.
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Don't resend ACKs because by the time we do, the other end will have
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resent the corresponding fragment so may as well not cause trouble. */
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f->ack_other = *other_ack, *other_ack = -1;
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f->start &= 1;
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f->end &= 1;
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f->retries++;
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@ -265,7 +314,8 @@ window_ack(struct frag_buffer *w, int seqid)
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for (size_t i = 0; i < w->windowsize; i++) {
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f = &w->frags[AFTER(w, i)];
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if (f->seqID == seqid && f->len > 0) { /* ACK first non-empty frag */
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if (f->acks > 0) DEBUG("ACK: %d ACKs for seqId %u", f->acks, seqid);
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if (f->acks > 0)
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DEBUG("DUPE ACK: %d ACKs for seqId %u", f->acks, seqid);
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f->acks ++;
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DEBUG(" ACK frag seq %u, ACKs %u, len %lu, s %u e %u", f->seqID, f->acks, f->len, f->start, f->end);
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break;
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@ -309,7 +359,7 @@ window_add_outgoing_data(struct frag_buffer *w, uint8_t *data, size_t len, int c
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compressed &= 1;
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size_t offset = 0;
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static fragment f;
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// DEBUG("add data len %lu, %lu frags, max fragsize %u", len, n, w->maxfraglen);
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DEBUG("add data len %lu, %lu frags, max fragsize %u", len, n, w->maxfraglen);
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for (size_t i = 0; i < n; i++) {
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memset(&f, 0, sizeof(f));
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f.len = MIN(len - offset, w->maxfraglen);
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@ -321,7 +371,6 @@ window_add_outgoing_data(struct frag_buffer *w, uint8_t *data, size_t len, int c
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f.ack_other = -1;
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window_append_fragment(w, &f);
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w->cur_seq_id = (w->cur_seq_id + 1) % MAX_SEQ_ID;
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// DEBUG(" a = %u, b = %u, a %% b = %u", (len - offset), (w->maxfraglen + 1), (len - offset) % (w->maxfraglen + 1));
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DEBUG(" fragment len %lu, seqID %u, s %u, end %u, dOffs %lu", f.len, f.seqID, f.start, f.end, offset);
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offset += f.len;
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}
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17
src/window.h
17
src/window.h
@ -32,7 +32,6 @@ typedef struct fragment {
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size_t len; /* Length of fragment data (0 if fragment unused) */
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unsigned seqID; /* fragment sequence ID */
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int ack_other; /* other way ACK seqID (>=0) or unset (<0) */
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int is_nack; /* 1 if other way ACK is a NACK */
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int compressed; /* compression flag */
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uint8_t start; /* start of chunk flag */
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uint8_t end; /* end of chunk flag */
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@ -55,11 +54,14 @@ struct frag_buffer {
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unsigned cur_seq_id; /* Most recent sequence ID */
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unsigned start_seq_id; /* Start of window sequence ID */
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unsigned resends; /* number of fragments resent */
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unsigned oos; /* Number of out-of-sequence fragments received */
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int direction; /* Sending or recving */
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};
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#ifdef WINDOW_DEBUG
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#define DEBUG(msg, ...) fprintf(stderr, "[WINDOW-DEBUG] (%s:%d) " msg "\n", __FILE__, __LINE__, ##__VA_ARGS__)
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extern int window_debug;
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#ifdef DEBUG_BUILD
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#define DEBUG(msg, ...) if (window_debug) fprintf(stderr, "[WINDOW-DEBUG] (%s:%d) " msg "\n", __FILE__, __LINE__, ##__VA_ARGS__)
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#else
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#define DEBUG(msg, ...)
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#endif
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@ -94,6 +96,12 @@ struct frag_buffer *window_buffer_init(size_t length, unsigned windowsize, unsig
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void window_buffer_resize(struct frag_buffer *w, size_t length);
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void window_buffer_destroy(struct frag_buffer *w);
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/* Clears fragments and resets window stats */
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void window_buffer_clear(struct frag_buffer *w);
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/* Resets window stats without clearing fragments */
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void window_buffer_reset(struct frag_buffer *w);
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/* Returns number of available fragment slots (NOT BYTES) */
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size_t window_buffer_available(struct frag_buffer *w);
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@ -107,6 +115,9 @@ int window_process_incoming_fragment(struct frag_buffer *w, fragment *f);
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* Returns length of data reassembled, or 0 if no data reassembled */
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size_t window_reassemble_data(struct frag_buffer *w, uint8_t *data, size_t maxlen, int *compression);
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/* Returns number of fragments to be sent */
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int window_sending(struct frag_buffer *w);
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/* Returns next fragment to be sent or NULL if nothing (SEND) */
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fragment *window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack);
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