45 static enum sctp_xmit __sctp_packet_append_chunk(struct sctp_packet *packet,
47 static enum sctp_xmit sctp_packet_can_append_data(struct sctp_packet *packet,
49 static void sctp_packet_append_data(struct sctp_packet *packet,
51 static enum sctp_xmit sctp_packet_will_fit(struct sctp_packet *packet,
55 static void sctp_packet_reset(struct sctp_packet *packet)  in sctp_packet_reset()  argument
60 	packet->size = packet->overhead;  in sctp_packet_reset()
62 	packet->has_cookie_echo = 0;  in sctp_packet_reset()
63 	packet->has_sack = 0;  in sctp_packet_reset()
64 	packet->has_data = 0;  in sctp_packet_reset()
65 	packet->has_auth = 0;  in sctp_packet_reset()
66 	packet->ipfragok = 0;  in sctp_packet_reset()
67 	packet->auth = NULL;  in sctp_packet_reset()
73 void sctp_packet_config(struct sctp_packet *packet, __u32 vtag,  in sctp_packet_config()  argument
76 	struct sctp_transport *tp = packet->transport;  in sctp_packet_config()
81 	pr_debug("%s: packet:%p vtag:0x%x\n", __func__, packet, vtag);  in sctp_packet_config()
82 	packet->vtag = vtag;  in sctp_packet_config()
85 	if (!sctp_packet_empty(packet))  in sctp_packet_config()
89 	packet->max_size = tp->pathmtu;  in sctp_packet_config()
95 	packet->overhead = sctp_mtu_payload(sp, 0, 0);  in sctp_packet_config()
96 	packet->size = packet->overhead;  in sctp_packet_config()
125 			sctp_packet_append_chunk(packet, chunk);  in sctp_packet_config()
137 	packet->max_size = sk_can_gso(sk) ? min(READ_ONCE(tp->dst->dev->gso_max_size),  in sctp_packet_config()
144 void sctp_packet_init(struct sctp_packet *packet,  in sctp_packet_init()  argument
148 	pr_debug("%s: packet:%p transport:%p\n", __func__, packet, transport);  in sctp_packet_init()
150 	packet->transport = transport;  in sctp_packet_init()
151 	packet->source_port = sport;  in sctp_packet_init()
152 	packet->destination_port = dport;  in sctp_packet_init()
153 	INIT_LIST_HEAD(&packet->chunk_list);  in sctp_packet_init()
155 	packet->overhead = 0;  in sctp_packet_init()
156 	sctp_packet_reset(packet);  in sctp_packet_init()
157 	packet->vtag = 0;  in sctp_packet_init()
161 void sctp_packet_free(struct sctp_packet *packet)  in sctp_packet_free()  argument
165 	pr_debug("%s: packet:%p\n", __func__, packet);  in sctp_packet_free()
167 	list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {  in sctp_packet_free()
180 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet,  in sctp_packet_transmit_chunk()  argument
187 		 packet, packet->size, chunk, chunk->skb ? chunk->skb->len : -1);  in sctp_packet_transmit_chunk()
189 	switch ((retval = (sctp_packet_append_chunk(packet, chunk)))) {  in sctp_packet_transmit_chunk()
191 		if (!packet->has_cookie_echo) {  in sctp_packet_transmit_chunk()
194 			error = sctp_packet_transmit(packet, gfp);  in sctp_packet_transmit_chunk()
202 				retval = sctp_packet_append_chunk(packet,  in sctp_packet_transmit_chunk()
328 static enum sctp_xmit __sctp_packet_append_chunk(struct sctp_packet *packet,  in __sctp_packet_append_chunk()  argument
335 	retval = sctp_packet_will_fit(packet, chunk, chunk_len);  in __sctp_packet_append_chunk()
344 		sctp_packet_append_data(packet, chunk);  in __sctp_packet_append_chunk()
346 		packet->has_sack = 1;  in __sctp_packet_append_chunk()
348 		packet->has_auth = 1;  in __sctp_packet_append_chunk()
350 		packet->has_data = 1;  in __sctp_packet_append_chunk()
357 		packet->has_cookie_echo = 1;  in __sctp_packet_append_chunk()
361 		packet->has_sack = 1;  in __sctp_packet_append_chunk()
367 		packet->has_auth = 1;  in __sctp_packet_append_chunk()
368 		packet->auth = chunk;  in __sctp_packet_append_chunk()
373 	list_add_tail(&chunk->list, &packet->chunk_list);  in __sctp_packet_append_chunk()
374 	packet->size += chunk_len;  in __sctp_packet_append_chunk()
375 	chunk->transport = packet->transport;  in __sctp_packet_append_chunk()
383 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet,  in sctp_packet_append_chunk()  argument
388 	pr_debug("%s: packet:%p chunk:%p\n", __func__, packet, chunk);  in sctp_packet_append_chunk()
395 		retval = sctp_packet_can_append_data(packet, chunk);  in sctp_packet_append_chunk()
401 	retval = sctp_packet_bundle_auth(packet, chunk);  in sctp_packet_append_chunk()
406 	retval = sctp_packet_bundle_sack(packet, chunk);  in sctp_packet_append_chunk()
410 	retval = __sctp_packet_append_chunk(packet, chunk);  in sctp_packet_append_chunk()
414 	retval = sctp_packet_bundle_pad(packet, chunk);  in sctp_packet_append_chunk()
436 static int sctp_packet_pack(struct sctp_packet *packet,  in sctp_packet_pack()  argument
439 	struct sctp_transport *tp = packet->transport;  in sctp_packet_pack()
452 		pkt_size = packet->size;  in sctp_packet_pack()
458 		pkt_size = packet->overhead;  in sctp_packet_pack()
459 		list_for_each_entry_safe(chunk, tmp, &packet->chunk_list,  in sctp_packet_pack()
463 			if (chunk == packet->auth)  in sctp_packet_pack()
465 			else if (auth_len + padded + packet->overhead >  in sctp_packet_pack()
475 		skb_reserve(nskb, packet->overhead + MAX_HEADER);  in sctp_packet_pack()
479 		pkt_size -= packet->overhead;  in sctp_packet_pack()
480 		list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {  in sctp_packet_pack()
496 			if (chunk == packet->auth)  in sctp_packet_pack()
512 			if (!sctp_chunk_is_data(chunk) && chunk != packet->auth)  in sctp_packet_pack()
521 						 packet->auth->shkey, gfp);  in sctp_packet_pack()
523 			if (list_empty(&packet->chunk_list))  in sctp_packet_pack()
524 				sctp_chunk_free(packet->auth);  in sctp_packet_pack()
526 				list_add(&packet->auth->list,  in sctp_packet_pack()
527 					 &packet->chunk_list);  in sctp_packet_pack()
534 	} while (!list_empty(&packet->chunk_list));  in sctp_packet_pack()
548 	    dst_xfrm(tp->dst) || packet->ipfragok || tp->encap_port) {  in sctp_packet_pack()
569 int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)  in sctp_packet_transmit()  argument
571 	struct sctp_transport *tp = packet->transport;  in sctp_packet_transmit()
579 	pr_debug("%s: packet:%p\n", __func__, packet);  in sctp_packet_transmit()
580 	if (list_empty(&packet->chunk_list))  in sctp_packet_transmit()
582 	chunk = list_entry(packet->chunk_list.next, struct sctp_chunk, list);  in sctp_packet_transmit()
585 	if (packet->size > tp->pathmtu && !packet->ipfragok && !chunk->pmtu_probe) {  in sctp_packet_transmit()
587 			packet->ipfragok = 1;  in sctp_packet_transmit()
598 	head = alloc_skb((gso ? packet->overhead : packet->size) +  in sctp_packet_transmit()
602 	skb_reserve(head, packet->overhead + MAX_HEADER);  in sctp_packet_transmit()
608 	sh->source = htons(packet->source_port);  in sctp_packet_transmit()
609 	sh->dest = htons(packet->destination_port);  in sctp_packet_transmit()
610 	sh->vtag = htonl(packet->vtag);  in sctp_packet_transmit()
621 	pkt_count = sctp_packet_pack(packet, head, gso, gfp);  in sctp_packet_transmit()
629 	if (packet->has_data && sctp_state(asoc, ESTABLISHED) &&  in sctp_packet_transmit()
647 	head->ignore_df = packet->ipfragok;  in sctp_packet_transmit()
658 	list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {  in sctp_packet_transmit()
663 	sctp_packet_reset(packet);  in sctp_packet_transmit()
672 static enum sctp_xmit sctp_packet_can_append_data(struct sctp_packet *packet,  in sctp_packet_can_append_data()  argument
676 	struct sctp_transport *transport = packet->transport;  in sctp_packet_can_append_data()
732 	if (!sctp_packet_empty(packet))  in sctp_packet_can_append_data()
743 	    packet->overhead - sctp_datachk_len(&chunk->asoc->stream) - 4)  in sctp_packet_can_append_data()
756 static void sctp_packet_append_data(struct sctp_packet *packet,  in sctp_packet_append_data()  argument
759 	struct sctp_transport *transport = packet->transport;  in sctp_packet_append_data()
781 static enum sctp_xmit sctp_packet_will_fit(struct sctp_packet *packet,  in sctp_packet_will_fit()  argument
793 	if ((packet->auth && chunk->shkey != packet->auth->shkey) ||  in sctp_packet_will_fit()
794 	    (!packet->auth && chunk->shkey &&  in sctp_packet_will_fit()
798 	psize = packet->size;  in sctp_packet_will_fit()
799 	if (packet->transport->asoc)  in sctp_packet_will_fit()
800 		pmtu = packet->transport->asoc->pathmtu;  in sctp_packet_will_fit()
802 		pmtu = packet->transport->pathmtu;  in sctp_packet_will_fit()
813 		if (sctp_packet_empty(packet) ||  in sctp_packet_will_fit()
814 		    (!packet->has_data && chunk->auth)) {  in sctp_packet_will_fit()
819 			packet->ipfragok = 1;  in sctp_packet_will_fit()
828 		maxsize = pmtu - packet->overhead;  in sctp_packet_will_fit()
829 		if (packet->auth)  in sctp_packet_will_fit()
830 			maxsize -= SCTP_PAD4(packet->auth->skb->len);  in sctp_packet_will_fit()
840 		if (!sctp_chunk_is_data(chunk) && packet->has_data)  in sctp_packet_will_fit()
843 		if (psize + chunk_len > packet->max_size)  in sctp_packet_will_fit()
847 		if (!packet->transport->burst_limited &&  in sctp_packet_will_fit()
848 		    psize + chunk_len > (packet->transport->cwnd >> 1))  in sctp_packet_will_fit()
854 		if (packet->transport->burst_limited &&  in sctp_packet_will_fit()
855 		    psize + chunk_len > (packet->transport->burst_limited >> 1))  in sctp_packet_will_fit()