net/sctp/transport.c

266 	if (t->pl.probe_count < SCTP_MAX_PROBES)
269 	t->pl.probe_count = 0;
270 	if (t->pl.state == SCTP_PL_BASE) {
271 		if (t->pl.probe_size == SCTP_BASE_PLPMTU) { /* BASE_PLPMTU Confirmation Failed */
272 			t->pl.state = SCTP_PL_ERROR; /* Base -> Error */
274 			t->pl.pmtu = SCTP_BASE_PLPMTU;
275 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
278 	} else if (t->pl.state == SCTP_PL_SEARCH) {
279 		if (t->pl.pmtu == t->pl.probe_size) { /* Black Hole Detected */
280 			t->pl.state = SCTP_PL_BASE;  /* Search -> Base */
281 			t->pl.probe_size = SCTP_BASE_PLPMTU;
282 			t->pl.probe_high = 0;
284 			t->pl.pmtu = SCTP_BASE_PLPMTU;
285 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
288 			t->pl.probe_high = t->pl.probe_size;
289 			t->pl.probe_size = t->pl.pmtu;
291 	} else if (t->pl.state == SCTP_PL_COMPLETE) {
292 		if (t->pl.pmtu == t->pl.probe_size) { /* Black Hole Detected */
293 			t->pl.state = SCTP_PL_BASE;  /* Search Complete -> Base */
294 			t->pl.probe_size = SCTP_BASE_PLPMTU;
296 			t->pl.pmtu = SCTP_BASE_PLPMTU;
297 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
304 		 __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, t->pl.probe_high);
305 	t->pl.probe_count++;
311 		 __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, t->pl.probe_high);
313 	t->pl.pmtu = t->pl.probe_size;
314 	t->pl.probe_count = 0;
315 	if (t->pl.state == SCTP_PL_BASE) {
316 		t->pl.state = SCTP_PL_SEARCH; /* Base -> Search */
317 		t->pl.probe_size += SCTP_PL_BIG_STEP;
318 	} else if (t->pl.state == SCTP_PL_ERROR) {
319 		t->pl.state = SCTP_PL_SEARCH; /* Error -> Search */
321 		t->pl.pmtu = t->pl.probe_size;
322 		t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
324 		t->pl.probe_size += SCTP_PL_BIG_STEP;
325 	} else if (t->pl.state == SCTP_PL_SEARCH) {
326 		if (!t->pl.probe_high) {
327 			if (t->pl.probe_size < SCTP_MAX_PLPMTU) {
328 				t->pl.probe_size = min(t->pl.probe_size + SCTP_PL_BIG_STEP,
332 			t->pl.probe_high = SCTP_MAX_PLPMTU;
334 		t->pl.probe_size += SCTP_PL_MIN_STEP;
335 		if (t->pl.probe_size >= t->pl.probe_high) {
336 			t->pl.probe_high = 0;
337 			t->pl.state = SCTP_PL_COMPLETE; /* Search -> Search Complete */
339 			t->pl.probe_size = t->pl.pmtu;
340 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
344 	} else if (t->pl.state == SCTP_PL_COMPLETE) {
346 		t->pl.state = SCTP_PL_SEARCH; /* Search Complete -> Search */
347 		t->pl.probe_size = min(t->pl.probe_size + SCTP_PL_MIN_STEP, SCTP_MAX_PLPMTU);
350 	return t->pl.state == SCTP_PL_COMPLETE;
356 		 __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, pmtu);
358 	if (pmtu < SCTP_MIN_PLPMTU || pmtu >= t->pl.probe_size)
361 	if (t->pl.state == SCTP_PL_BASE) {
363 			t->pl.state = SCTP_PL_ERROR; /* Base -> Error */
365 			t->pl.pmtu = SCTP_BASE_PLPMTU;
366 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
369 	} else if (t->pl.state == SCTP_PL_SEARCH) {
370 		if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {
371 			t->pl.state = SCTP_PL_BASE;  /* Search -> Base */
372 			t->pl.probe_size = SCTP_BASE_PLPMTU;
373 			t->pl.probe_count = 0;
375 			t->pl.probe_high = 0;
376 			t->pl.pmtu = SCTP_BASE_PLPMTU;
377 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
379 		} else if (pmtu > t->pl.pmtu && pmtu < t->pl.probe_size) {
380 			t->pl.probe_size = pmtu;
381 			t->pl.probe_count = 0;
383 	} else if (t->pl.state == SCTP_PL_COMPLETE) {
384 		if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {
385 			t->pl.state = SCTP_PL_BASE;  /* Complete -> Base */
386 			t->pl.probe_size = SCTP_BASE_PLPMTU;
387 			t->pl.probe_count = 0;
389 			t->pl.probe_high = 0;
390 			t->pl.pmtu = SCTP_BASE_PLPMTU;
391 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);