266 void sctp_transport_pl_send(struct sctp_transport *t)  in sctp_transport_pl_send()  argument
268 	if (t->pl.probe_count < SCTP_MAX_PROBES)  in sctp_transport_pl_send()
271 	t->pl.probe_count = 0;  in sctp_transport_pl_send()
272 	if (t->pl.state == SCTP_PL_BASE) {  in sctp_transport_pl_send()
273 		if (t->pl.probe_size == SCTP_BASE_PLPMTU) { /* BASE_PLPMTU Confirmation Failed */  in sctp_transport_pl_send()
274 			t->pl.state = SCTP_PL_ERROR; /* Base -> Error */  in sctp_transport_pl_send()
276 			t->pl.pmtu = SCTP_BASE_PLPMTU;  in sctp_transport_pl_send()
277 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_send()
278 			sctp_assoc_sync_pmtu(t->asoc);  in sctp_transport_pl_send()
280 	} else if (t->pl.state == SCTP_PL_SEARCH) {  in sctp_transport_pl_send()
281 		if (t->pl.pmtu == t->pl.probe_size) { /* Black Hole Detected */  in sctp_transport_pl_send()
282 			t->pl.state = SCTP_PL_BASE;  /* Search -> Base */  in sctp_transport_pl_send()
283 			t->pl.probe_size = SCTP_BASE_PLPMTU;  in sctp_transport_pl_send()
284 			t->pl.probe_high = 0;  in sctp_transport_pl_send()
286 			t->pl.pmtu = SCTP_BASE_PLPMTU;  in sctp_transport_pl_send()
287 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_send()
288 			sctp_assoc_sync_pmtu(t->asoc);  in sctp_transport_pl_send()
290 			t->pl.probe_high = t->pl.probe_size;  in sctp_transport_pl_send()
291 			t->pl.probe_size = t->pl.pmtu;  in sctp_transport_pl_send()
293 	} else if (t->pl.state == SCTP_PL_COMPLETE) {  in sctp_transport_pl_send()
294 		if (t->pl.pmtu == t->pl.probe_size) { /* Black Hole Detected */  in sctp_transport_pl_send()
295 			t->pl.state = SCTP_PL_BASE;  /* Search Complete -> Base */  in sctp_transport_pl_send()
296 			t->pl.probe_size = SCTP_BASE_PLPMTU;  in sctp_transport_pl_send()
298 			t->pl.pmtu = SCTP_BASE_PLPMTU;  in sctp_transport_pl_send()
299 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_send()
300 			sctp_assoc_sync_pmtu(t->asoc);  in sctp_transport_pl_send()
306 		 __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, t->pl.probe_high);  in sctp_transport_pl_send()
307 	t->pl.probe_count++;  in sctp_transport_pl_send()
310 bool sctp_transport_pl_recv(struct sctp_transport *t)  in sctp_transport_pl_recv()  argument
313 		 __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, t->pl.probe_high);  in sctp_transport_pl_recv()
315 	t->pl.pmtu = t->pl.probe_size;  in sctp_transport_pl_recv()
316 	t->pl.probe_count = 0;  in sctp_transport_pl_recv()
317 	if (t->pl.state == SCTP_PL_BASE) {  in sctp_transport_pl_recv()
318 		t->pl.state = SCTP_PL_SEARCH; /* Base -> Search */  in sctp_transport_pl_recv()
319 		t->pl.probe_size += SCTP_PL_BIG_STEP;  in sctp_transport_pl_recv()
320 	} else if (t->pl.state == SCTP_PL_ERROR) {  in sctp_transport_pl_recv()
321 		t->pl.state = SCTP_PL_SEARCH; /* Error -> Search */  in sctp_transport_pl_recv()
323 		t->pl.pmtu = t->pl.probe_size;  in sctp_transport_pl_recv()
324 		t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_recv()
325 		sctp_assoc_sync_pmtu(t->asoc);  in sctp_transport_pl_recv()
326 		t->pl.probe_size += SCTP_PL_BIG_STEP;  in sctp_transport_pl_recv()
327 	} else if (t->pl.state == SCTP_PL_SEARCH) {  in sctp_transport_pl_recv()
328 		if (!t->pl.probe_high) {  in sctp_transport_pl_recv()
329 			t->pl.probe_size = min(t->pl.probe_size + SCTP_PL_BIG_STEP,  in sctp_transport_pl_recv()
333 		t->pl.probe_size += SCTP_PL_MIN_STEP;  in sctp_transport_pl_recv()
334 		if (t->pl.probe_size >= t->pl.probe_high) {  in sctp_transport_pl_recv()
335 			t->pl.probe_high = 0;  in sctp_transport_pl_recv()
336 			t->pl.state = SCTP_PL_COMPLETE; /* Search -> Search Complete */  in sctp_transport_pl_recv()
338 			t->pl.probe_size = t->pl.pmtu;  in sctp_transport_pl_recv()
339 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_recv()
340 			sctp_assoc_sync_pmtu(t->asoc);  in sctp_transport_pl_recv()
341 			sctp_transport_reset_raise_timer(t);  in sctp_transport_pl_recv()
343 	} else if (t->pl.state == SCTP_PL_COMPLETE) {  in sctp_transport_pl_recv()
345 		t->pl.state = SCTP_PL_SEARCH; /* Search Complete -> Search */  in sctp_transport_pl_recv()
346 		t->pl.probe_size += SCTP_PL_MIN_STEP;  in sctp_transport_pl_recv()
349 	return t->pl.state == SCTP_PL_COMPLETE;  in sctp_transport_pl_recv()
352 static bool sctp_transport_pl_toobig(struct sctp_transport *t, u32 pmtu)  in sctp_transport_pl_toobig()  argument
355 		 __func__, t, t->pl.state, t->pl.pmtu, t->pl.probe_size, pmtu);  in sctp_transport_pl_toobig()
357 	if (pmtu < SCTP_MIN_PLPMTU || pmtu >= t->pl.probe_size)  in sctp_transport_pl_toobig()
360 	if (t->pl.state == SCTP_PL_BASE) {  in sctp_transport_pl_toobig()
362 			t->pl.state = SCTP_PL_ERROR; /* Base -> Error */  in sctp_transport_pl_toobig()
364 			t->pl.pmtu = SCTP_BASE_PLPMTU;  in sctp_transport_pl_toobig()
365 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_toobig()
368 	} else if (t->pl.state == SCTP_PL_SEARCH) {  in sctp_transport_pl_toobig()
369 		if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {  in sctp_transport_pl_toobig()
370 			t->pl.state = SCTP_PL_BASE;  /* Search -> Base */  in sctp_transport_pl_toobig()
371 			t->pl.probe_size = SCTP_BASE_PLPMTU;  in sctp_transport_pl_toobig()
372 			t->pl.probe_count = 0;  in sctp_transport_pl_toobig()
374 			t->pl.probe_high = 0;  in sctp_transport_pl_toobig()
375 			t->pl.pmtu = SCTP_BASE_PLPMTU;  in sctp_transport_pl_toobig()
376 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_toobig()
378 		} else if (pmtu > t->pl.pmtu && pmtu < t->pl.probe_size) {  in sctp_transport_pl_toobig()
379 			t->pl.probe_size = pmtu;  in sctp_transport_pl_toobig()
380 			t->pl.probe_count = 0;  in sctp_transport_pl_toobig()
382 	} else if (t->pl.state == SCTP_PL_COMPLETE) {  in sctp_transport_pl_toobig()
383 		if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {  in sctp_transport_pl_toobig()
384 			t->pl.state = SCTP_PL_BASE;  /* Complete -> Base */  in sctp_transport_pl_toobig()
385 			t->pl.probe_size = SCTP_BASE_PLPMTU;  in sctp_transport_pl_toobig()
386 			t->pl.probe_count = 0;  in sctp_transport_pl_toobig()
388 			t->pl.probe_high = 0;  in sctp_transport_pl_toobig()
389 			t->pl.pmtu = SCTP_BASE_PLPMTU;  in sctp_transport_pl_toobig()
390 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);  in sctp_transport_pl_toobig()
391 			sctp_transport_reset_probe_timer(t);  in sctp_transport_pl_toobig()
399 bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)  in sctp_transport_update_pmtu()  argument
401 	struct sock *sk = t->asoc->base.sk;  in sctp_transport_update_pmtu()
413 	if (sctp_transport_pl_enabled(t))  in sctp_transport_update_pmtu()
414 		return sctp_transport_pl_toobig(t, pmtu - sctp_transport_pl_hlen(t));  in sctp_transport_update_pmtu()
416 	dst = sctp_transport_dst_check(t);  in sctp_transport_update_pmtu()
422 		pf->to_sk_daddr(&t->ipaddr, sk);  in sctp_transport_update_pmtu()
426 		dst = sctp_transport_dst_check(t);  in sctp_transport_update_pmtu()
430 		t->af_specific->get_dst(t, &t->saddr, &t->fl, sk);  in sctp_transport_update_pmtu()
431 		dst = t->dst;  in sctp_transport_update_pmtu()
437 		change = t->pathmtu != pmtu;  in sctp_transport_update_pmtu()
439 	t->pathmtu = pmtu;  in sctp_transport_update_pmtu()
754 void sctp_transport_burst_limited(struct sctp_transport *t)  in sctp_transport_burst_limited()  argument
756 	struct sctp_association *asoc = t->asoc;  in sctp_transport_burst_limited()
757 	u32 old_cwnd = t->cwnd;  in sctp_transport_burst_limited()
760 	if (t->burst_limited || asoc->max_burst == 0)  in sctp_transport_burst_limited()
763 	max_burst_bytes = t->flight_size + (asoc->max_burst * asoc->pathmtu);  in sctp_transport_burst_limited()
765 		t->cwnd = max_burst_bytes;  in sctp_transport_burst_limited()
766 		t->burst_limited = old_cwnd;  in sctp_transport_burst_limited()
773 void sctp_transport_burst_reset(struct sctp_transport *t)  in sctp_transport_burst_reset()  argument
775 	if (t->burst_limited) {  in sctp_transport_burst_reset()
776 		t->cwnd = t->burst_limited;  in sctp_transport_burst_reset()
777 		t->burst_limited = 0;  in sctp_transport_burst_reset()
795 void sctp_transport_reset(struct sctp_transport *t)  in sctp_transport_reset()  argument
797 	struct sctp_association *asoc = t->asoc;  in sctp_transport_reset()
804 	t->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380));  in sctp_transport_reset()
805 	t->burst_limited = 0;  in sctp_transport_reset()
806 	t->ssthresh = asoc->peer.i.a_rwnd;  in sctp_transport_reset()
807 	t->rto = asoc->rto_initial;  in sctp_transport_reset()
808 	sctp_max_rto(asoc, t);  in sctp_transport_reset()
809 	t->rtt = 0;  in sctp_transport_reset()
810 	t->srtt = 0;  in sctp_transport_reset()
811 	t->rttvar = 0;  in sctp_transport_reset()
814 	t->partial_bytes_acked = 0;  in sctp_transport_reset()
815 	t->flight_size = 0;  in sctp_transport_reset()
816 	t->error_count = 0;  in sctp_transport_reset()
817 	t->rto_pending = 0;  in sctp_transport_reset()
818 	t->hb_sent = 0;  in sctp_transport_reset()
821 	t->cacc.changeover_active = 0;  in sctp_transport_reset()
822 	t->cacc.cycling_changeover = 0;  in sctp_transport_reset()
823 	t->cacc.next_tsn_at_change = 0;  in sctp_transport_reset()
824 	t->cacc.cacc_saw_newack = 0;  in sctp_transport_reset()
828 void sctp_transport_immediate_rtx(struct sctp_transport *t)  in sctp_transport_immediate_rtx()  argument
831 	if (del_timer(&t->T3_rtx_timer))  in sctp_transport_immediate_rtx()
832 		sctp_transport_put(t);  in sctp_transport_immediate_rtx()
834 	sctp_retransmit(&t->asoc->outqueue, t, SCTP_RTXR_T3_RTX);  in sctp_transport_immediate_rtx()
835 	if (!timer_pending(&t->T3_rtx_timer)) {  in sctp_transport_immediate_rtx()
836 		if (!mod_timer(&t->T3_rtx_timer, jiffies + t->rto))  in sctp_transport_immediate_rtx()
837 			sctp_transport_hold(t);  in sctp_transport_immediate_rtx()
842 void sctp_transport_dst_release(struct sctp_transport *t)  in sctp_transport_dst_release()  argument
844 	dst_release(t->dst);  in sctp_transport_dst_release()
845 	t->dst = NULL;  in sctp_transport_dst_release()
846 	t->dst_pending_confirm = 0;  in sctp_transport_dst_release()
850 void sctp_transport_dst_confirm(struct sctp_transport *t)  in sctp_transport_dst_confirm()  argument
852 	t->dst_pending_confirm = 1;  in sctp_transport_dst_confirm()