sctp: use common head of addr parameter to access member in addr-unrelated code

The 'p' member of struct sctp_paramhdr is common part for
IPv4 addr parameter and IPv6 addr parameter in union sctp_addr_param.

For addr-related code, use specified addr parameter.
Otherwise, use common header to access type/length member.

Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/input.c

@@ -1017,7 +1017,7 @@ static struct sctp_association *__sctp_rcv_asconf_lookup(
 	/* Skip over the ADDIP header and find the Address parameter */
 	param = (union sctp_addr_param *)(asconf + 1);
 
-	af = sctp_get_af_specific(param_type2af(param->v4.param_hdr.type));
+	af = sctp_get_af_specific(param_type2af(param->p.type));
 	if (unlikely(!af))
 		return NULL;
 

net/sctp/sm_make_chunk.c

@@ -2923,7 +2923,7 @@ static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
 	    asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
 		return SCTP_ERROR_UNKNOWN_PARAM;
 
-	switch (addr_param->v4.param_hdr.type) {
+	switch (addr_param->p.type) {
 	case SCTP_PARAM_IPV6_ADDRESS:
 		if (!asoc->peer.ipv6_address)
 			return SCTP_ERROR_DNS_FAILED;
@@ -2936,7 +2936,7 @@ static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
 		return SCTP_ERROR_DNS_FAILED;
 	}
 
-	af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
+	af = sctp_get_af_specific(param_type2af(addr_param->p.type));
 	if (unlikely(!af))
 		return SCTP_ERROR_DNS_FAILED;
 
@@ -3100,7 +3100,7 @@ struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
 	/* Skip the address parameter and store a pointer to the first
 	 * asconf parameter.
 	 */
-	length = ntohs(addr_param->v4.param_hdr.length);
+	length = ntohs(addr_param->p.length);
 	asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
 	chunk_len -= length;
 
@@ -3177,7 +3177,7 @@ static void sctp_asconf_param_success(struct sctp_association *asoc,
 			((void *)asconf_param + sizeof(sctp_addip_param_t));
 
 	/* We have checked the packet before, so we do not check again.	*/
-	af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
+	af = sctp_get_af_specific(param_type2af(addr_param->p.type));
 	af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
 
 	switch (asconf_param->param_hdr.type) {
@@ -3304,7 +3304,7 @@ int sctp_process_asconf_ack(struct sctp_association *asoc,
 	/* Skip the address parameter in the last asconf sent and store a
 	 * pointer to the first asconf parameter.
 	 */
-	length = ntohs(addr_param->v4.param_hdr.length);
+	length = ntohs(addr_param->p.length);
 	asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
 	asconf_len -= length;