Function sctp_input_with_port

freebsd/netinet/sctp_input.c:5698–5800

#ifdef INET
void
sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
{
	struct mbuf *m;
	int iphlen;
	uint32_t vrf_id = 0;
	uint8_t ecn_bits;
	struct sockaddr_in src, dst;
	struct ip *ip;
	struct sctphdr *sh;
	struct sctp_chunkhdr *ch;
	int length, offset;
	uint8_t compute_crc;
	uint32_t mflowid;
	uint8_t mflowtype;
	uint16_t fibnum;

	iphlen = off;
	if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
		SCTP_RELEASE_PKT(i_pak);
		return;
	}
	m = SCTP_HEADER_TO_CHAIN(i_pak);
#ifdef SCTP_MBUF_LOGGING
	/* Log in any input mbufs */
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
		sctp_log_mbc(m, SCTP_MBUF_INPUT);
	}
#endif
#ifdef SCTP_PACKET_LOGGING
	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
		sctp_packet_log(m);
	}
#endif
	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
	    "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
	    m->m_pkthdr.len,
	    if_name(m->m_pkthdr.rcvif),
	    (int)m->m_pkthdr.csum_flags, CSUM_BITS);
	mflowid = m->m_pkthdr.flowid;
	mflowtype = M_HASHTYPE_GET(m);
	fibnum = M_GETFIB(m);
	SCTP_STAT_INCR(sctps_recvpackets);
	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
	/* Get IP, SCTP, and first chunk header together in the first mbuf. */
	offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
	if (SCTP_BUF_LEN(m) < offset) {
		if ((m = m_pullup(m, offset)) == NULL) {
			SCTP_STAT_INCR(sctps_hdrops);
			return;
		}
	}
	ip = mtod(m, struct ip *);
	sh = (struct sctphdr *)((caddr_t)ip + iphlen);
	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
	offset -= sizeof(struct sctp_chunkhdr);
	memset(&src, 0, sizeof(struct sockaddr_in));
	src.sin_family = AF_INET;