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Commit 2040d3d7 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add reconf chunk process 



This patch is to add a function to process the incoming reconf chunk,
in which it verifies the chunk, and traverses the param and process
it with the right function one by one.

sctp_sf_do_reconf would be the process function of reconf chunk event.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ea625043

include/net/sctp/sm.h

+1 −0
Original line number Diff line number Diff line
@@ -135,6 +135,7 @@ sctp_state_fn_t sctp_sf_do_8_5_1_E_sa; 
sctp_state_fn_t sctp_sf_cookie_echoed_err;

sctp_state_fn_t sctp_sf_do_asconf;

sctp_state_fn_t sctp_sf_do_asconf_ack;

sctp_state_fn_t sctp_sf_do_reconf;

sctp_state_fn_t sctp_sf_do_9_2_reshutack;

sctp_state_fn_t sctp_sf_eat_fwd_tsn;

sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;

net/sctp/sm_statefuns.c

+54 −0
Original line number Diff line number Diff line
@@ -3834,6 +3834,60 @@ sctp_disposition_t sctp_sf_do_asconf_ack(struct net *net, 
	return SCTP_DISPOSITION_DISCARD;

}



/* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */

sctp_disposition_t sctp_sf_do_reconf(struct net *net,

				     const struct sctp_endpoint *ep,

				     const struct sctp_association *asoc,

				     const sctp_subtype_t type, void *arg,

				     sctp_cmd_seq_t *commands)

{

	struct sctp_paramhdr *err_param = NULL;

	struct sctp_chunk *chunk = arg;

	struct sctp_reconf_chunk *hdr;

	union sctp_params param;



	if (!sctp_vtag_verify(chunk, asoc)) {

		sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG,

				SCTP_NULL());

		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);

	}



	/* Make sure that the RECONF chunk has a valid length.  */

	if (!sctp_chunk_length_valid(chunk, sizeof(*hdr)))

		return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,

						  commands);



	if (!sctp_verify_reconf(asoc, chunk, &err_param))

		return sctp_sf_violation_paramlen(net, ep, asoc, type, arg,

						  (void *)err_param, commands);



	hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;

	sctp_walk_params(param, hdr, params) {

		struct sctp_chunk *reply = NULL;

		struct sctp_ulpevent *ev = NULL;



		if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST)

			reply = sctp_process_strreset_outreq(

				(struct sctp_association *)asoc, param, &ev);

		else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST)

			reply = sctp_process_strreset_inreq(

				(struct sctp_association *)asoc, param, &ev);

		/* More handles for other types will be added here, by now it

		 * just ignores other types.

		 */



		if (ev)

			sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,

					SCTP_ULPEVENT(ev));



		if (reply)

			sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,

					SCTP_CHUNK(reply));

	}



	return SCTP_DISPOSITION_CONSUME;

}



/*

 * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP

 *