60 static enum sctp_xmit __sctp_packet_append_chunk(struct sctp_packet *packet,
62 static enum sctp_xmit sctp_packet_can_append_data(struct sctp_packet *packet,
64 static void sctp_packet_append_data(struct sctp_packet *packet,
66 static enum sctp_xmit sctp_packet_will_fit(struct sctp_packet *packet,
70 static void sctp_packet_reset(struct sctp_packet *packet)  in sctp_packet_reset()  argument
75 	packet->size = packet->overhead;  in sctp_packet_reset()
77 	packet->has_cookie_echo = 0;  in sctp_packet_reset()
78 	packet->has_sack = 0;  in sctp_packet_reset()
79 	packet->has_data = 0;  in sctp_packet_reset()
80 	packet->has_auth = 0;  in sctp_packet_reset()
81 	packet->ipfragok = 0;  in sctp_packet_reset()
82 	packet->auth = NULL;  in sctp_packet_reset()
88 void sctp_packet_config(struct sctp_packet *packet, __u32 vtag,  in sctp_packet_config()  argument
91 	struct sctp_transport *tp = packet->transport;  in sctp_packet_config()
96 	pr_debug("%s: packet:%p vtag:0x%x\n", __func__, packet, vtag);  in sctp_packet_config()
97 	packet->vtag = vtag;  in sctp_packet_config()
100 	if (!sctp_packet_empty(packet))  in sctp_packet_config()
104 	packet->max_size = tp->pathmtu;  in sctp_packet_config()
110 	packet->overhead = sctp_mtu_payload(sp, 0, 0);  in sctp_packet_config()
111 	packet->size = packet->overhead;  in sctp_packet_config()
136 			sctp_packet_append_chunk(packet, chunk);  in sctp_packet_config()
148 	packet->max_size = sk_can_gso(sk) ? tp->dst->dev->gso_max_size  in sctp_packet_config()
154 void sctp_packet_init(struct sctp_packet *packet,  in sctp_packet_init()  argument
158 	pr_debug("%s: packet:%p transport:%p\n", __func__, packet, transport);  in sctp_packet_init()
160 	packet->transport = transport;  in sctp_packet_init()
161 	packet->source_port = sport;  in sctp_packet_init()
162 	packet->destination_port = dport;  in sctp_packet_init()
163 	INIT_LIST_HEAD(&packet->chunk_list);  in sctp_packet_init()
165 	packet->overhead = 0;  in sctp_packet_init()
166 	sctp_packet_reset(packet);  in sctp_packet_init()
167 	packet->vtag = 0;  in sctp_packet_init()
171 void sctp_packet_free(struct sctp_packet *packet)  in sctp_packet_free()  argument
175 	pr_debug("%s: packet:%p\n", __func__, packet);  in sctp_packet_free()
177 	list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {  in sctp_packet_free()
190 enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet,  in sctp_packet_transmit_chunk()  argument
197 		 packet, packet->size, chunk, chunk->skb ? chunk->skb->len : -1);  in sctp_packet_transmit_chunk()
199 	switch ((retval = (sctp_packet_append_chunk(packet, chunk)))) {  in sctp_packet_transmit_chunk()
201 		if (!packet->has_cookie_echo) {  in sctp_packet_transmit_chunk()
204 			error = sctp_packet_transmit(packet, gfp);  in sctp_packet_transmit_chunk()
212 				retval = sctp_packet_append_chunk(packet,  in sctp_packet_transmit_chunk()
311 static enum sctp_xmit __sctp_packet_append_chunk(struct sctp_packet *packet,  in __sctp_packet_append_chunk()  argument
318 	retval = sctp_packet_will_fit(packet, chunk, chunk_len);  in __sctp_packet_append_chunk()
327 		sctp_packet_append_data(packet, chunk);  in __sctp_packet_append_chunk()
329 		packet->has_sack = 1;  in __sctp_packet_append_chunk()
331 		packet->has_auth = 1;  in __sctp_packet_append_chunk()
333 		packet->has_data = 1;  in __sctp_packet_append_chunk()
340 		packet->has_cookie_echo = 1;  in __sctp_packet_append_chunk()
344 		packet->has_sack = 1;  in __sctp_packet_append_chunk()
350 		packet->has_auth = 1;  in __sctp_packet_append_chunk()
351 		packet->auth = chunk;  in __sctp_packet_append_chunk()
356 	list_add_tail(&chunk->list, &packet->chunk_list);  in __sctp_packet_append_chunk()
357 	packet->size += chunk_len;  in __sctp_packet_append_chunk()
358 	chunk->transport = packet->transport;  in __sctp_packet_append_chunk()
366 enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet,  in sctp_packet_append_chunk()  argument
371 	pr_debug("%s: packet:%p chunk:%p\n", __func__, packet, chunk);  in sctp_packet_append_chunk()
378 		retval = sctp_packet_can_append_data(packet, chunk);  in sctp_packet_append_chunk()
384 	retval = sctp_packet_bundle_auth(packet, chunk);  in sctp_packet_append_chunk()
389 	retval = sctp_packet_bundle_sack(packet, chunk);  in sctp_packet_append_chunk()
393 	retval = __sctp_packet_append_chunk(packet, chunk);  in sctp_packet_append_chunk()
433 static int sctp_packet_pack(struct sctp_packet *packet,  in sctp_packet_pack()  argument
436 	struct sctp_transport *tp = packet->transport;  in sctp_packet_pack()
449 		pkt_size = packet->size;  in sctp_packet_pack()
455 		pkt_size = packet->overhead;  in sctp_packet_pack()
456 		list_for_each_entry_safe(chunk, tmp, &packet->chunk_list,  in sctp_packet_pack()
460 			if (chunk == packet->auth)  in sctp_packet_pack()
462 			else if (auth_len + padded + packet->overhead >  in sctp_packet_pack()
472 		skb_reserve(nskb, packet->overhead + MAX_HEADER);  in sctp_packet_pack()
476 		pkt_size -= packet->overhead;  in sctp_packet_pack()
477 		list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {  in sctp_packet_pack()
493 			if (chunk == packet->auth)  in sctp_packet_pack()
509 			if (!sctp_chunk_is_data(chunk) && chunk != packet->auth)  in sctp_packet_pack()
518 						 packet->auth->shkey, gfp);  in sctp_packet_pack()
520 			if (list_empty(&packet->chunk_list))  in sctp_packet_pack()
521 				sctp_chunk_free(packet->auth);  in sctp_packet_pack()
523 				list_add(&packet->auth->list,  in sctp_packet_pack()
524 					 &packet->chunk_list);  in sctp_packet_pack()
531 	} while (!list_empty(&packet->chunk_list));  in sctp_packet_pack()
551 	    dst_xfrm(skb_dst(head)) || packet->ipfragok) {  in sctp_packet_pack()
572 int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)  in sctp_packet_transmit()  argument
574 	struct sctp_transport *tp = packet->transport;  in sctp_packet_transmit()
583 	pr_debug("%s: packet:%p\n", __func__, packet);  in sctp_packet_transmit()
584 	if (list_empty(&packet->chunk_list))  in sctp_packet_transmit()
586 	chunk = list_entry(packet->chunk_list.next, struct sctp_chunk, list);  in sctp_packet_transmit()
590 	if (packet->size > tp->pathmtu && !packet->ipfragok) {  in sctp_packet_transmit()
599 	head = alloc_skb((gso ? packet->overhead : packet->size) +  in sctp_packet_transmit()
603 	skb_reserve(head, packet->overhead + MAX_HEADER);  in sctp_packet_transmit()
609 	sh->source = htons(packet->source_port);  in sctp_packet_transmit()
610 	sh->dest = htons(packet->destination_port);  in sctp_packet_transmit()
611 	sh->vtag = htonl(packet->vtag);  in sctp_packet_transmit()
624 	pkt_count = sctp_packet_pack(packet, head, gso, gfp);  in sctp_packet_transmit()
632 	if (packet->has_data && sctp_state(asoc, ESTABLISHED) &&  in sctp_packet_transmit()
650 	head->ignore_df = packet->ipfragok;  in sctp_packet_transmit()
661 	list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {  in sctp_packet_transmit()
666 	sctp_packet_reset(packet);  in sctp_packet_transmit()
675 static enum sctp_xmit sctp_packet_can_append_data(struct sctp_packet *packet,  in sctp_packet_can_append_data()  argument
679 	struct sctp_transport *transport = packet->transport;  in sctp_packet_can_append_data()
735 	if (!sctp_packet_empty(packet))  in sctp_packet_can_append_data()
746 	    packet->overhead - sctp_datachk_len(&chunk->asoc->stream) - 4)  in sctp_packet_can_append_data()
759 static void sctp_packet_append_data(struct sctp_packet *packet,  in sctp_packet_append_data()  argument
762 	struct sctp_transport *transport = packet->transport;  in sctp_packet_append_data()
784 static enum sctp_xmit sctp_packet_will_fit(struct sctp_packet *packet,  in sctp_packet_will_fit()  argument
796 	if ((packet->auth && chunk->shkey != packet->auth->shkey) ||  in sctp_packet_will_fit()
797 	    (!packet->auth && chunk->shkey &&  in sctp_packet_will_fit()
801 	psize = packet->size;  in sctp_packet_will_fit()
802 	if (packet->transport->asoc)  in sctp_packet_will_fit()
803 		pmtu = packet->transport->asoc->pathmtu;  in sctp_packet_will_fit()
805 		pmtu = packet->transport->pathmtu;  in sctp_packet_will_fit()
816 		if (sctp_packet_empty(packet) ||  in sctp_packet_will_fit()
817 		    (!packet->has_data && chunk->auth)) {  in sctp_packet_will_fit()
822 			packet->ipfragok = 1;  in sctp_packet_will_fit()
831 		maxsize = pmtu - packet->overhead;  in sctp_packet_will_fit()
832 		if (packet->auth)  in sctp_packet_will_fit()
833 			maxsize -= SCTP_PAD4(packet->auth->skb->len);  in sctp_packet_will_fit()
843 		if (!sctp_chunk_is_data(chunk) && packet->has_data)  in sctp_packet_will_fit()
846 		if (psize + chunk_len > packet->max_size)  in sctp_packet_will_fit()
850 		if (!packet->transport->burst_limited &&  in sctp_packet_will_fit()
851 		    psize + chunk_len > (packet->transport->cwnd >> 1))  in sctp_packet_will_fit()
857 		if (packet->transport->burst_limited &&  in sctp_packet_will_fit()
858 		    psize + chunk_len > (packet->transport->burst_limited >> 1))  in sctp_packet_will_fit()