Cosmetic-only changes for readability.
Reviewed by: (early form passed by) bde Approved by: itojun (from core@kame.net)
This commit is contained in:
parent
74495bcdab
commit
c068736a61
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=102002
@ -68,32 +68,25 @@
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#include <netinet/ip_icmp.h> /* for ICMP_BANDLIM */
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#include <netinet/icmp_var.h> /* for ICMP_BANDLIM */
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#endif
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#ifdef INET6
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#include <netinet6/tcp6_var.h>
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#endif
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#include <netinet/tcpip.h>
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#ifdef TCPDEBUG
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#include <netinet/tcp_debug.h>
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#endif /* TCPDEBUG */
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#ifdef INET6
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#include <netinet6/ipsec6.h>
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#endif
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#include <netkey/key.h>
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#endif /*IPSEC*/
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@ -101,7 +94,7 @@
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MALLOC_DEFINE(M_TSEGQ, "tseg_qent", "TCP segment queue entry");
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static int tcprexmtthresh = 3;
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static const int tcprexmtthresh = 3;
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tcp_cc tcp_ccgen;
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struct tcpstat tcpstat;
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@ -138,7 +131,7 @@ static void tcp_pulloutofband(struct socket *,
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static int tcp_reass(struct tcpcb *, struct tcphdr *, int *,
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struct mbuf *);
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static void tcp_xmit_timer(struct tcpcb *, int);
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static int tcp_newreno(struct tcpcb *, struct tcphdr *);
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static void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
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/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
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#ifdef INET6
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@ -350,29 +343,35 @@ tcp_input(m, off0)
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struct rmxp_tao *taop; /* pointer to our TAO cache entry */
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struct rmxp_tao tao_noncached; /* in case there's no cached entry */
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int headlocked = 0;
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struct sockaddr_in *next_hop = NULL;
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int rstreason; /* For badport_bandlim accounting purposes */
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struct ip6_hdr *ip6 = NULL;
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#ifdef INET6
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int isipv6;
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#else
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const int isipv6 = 0;
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#endif
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#ifdef TCPDEBUG
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/*
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* The size of tcp_saveipgen must be the size of the max ip header,
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* now IPv6.
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*/
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u_char tcp_saveipgen[40];
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/* the size of the above must be of max ip header, now IPv6 */
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struct tcphdr tcp_savetcp;
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short ostate = 0;
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#endif
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL;
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int isipv6;
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#endif /* INET6 */
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struct sockaddr_in *next_hop = NULL;
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#ifdef MAC
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int error;
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#endif
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int rstreason; /* For badport_bandlim accounting purposes */
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/* Grab info from MT_TAG mbufs prepended to the chain. */
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for (;m && m->m_type == MT_TAG; m = m->m_next) {
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if (m->m_tag_id == PACKET_TAG_IPFORWARD)
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next_hop = (struct sockaddr_in *)m->m_hdr.mh_data;
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}
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#ifdef INET6
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isipv6 = (mtod(m, struct ip *)->ip_v == 6) ? 1 : 0;
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#endif
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@ -380,7 +379,6 @@ tcp_input(m, off0)
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tcpstat.tcps_rcvtotal++;
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#ifdef INET6
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if (isipv6) {
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/* IP6_EXTHDR_CHECK() is already done at tcp6_input() */
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ip6 = mtod(m, struct ip6_hdr *);
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@ -403,55 +401,55 @@ tcp_input(m, off0)
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/* XXX stat */
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goto drop;
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}
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} else
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#endif /* INET6 */
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{
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/*
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* Get IP and TCP header together in first mbuf.
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* Note: IP leaves IP header in first mbuf.
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*/
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if (off0 > sizeof (struct ip)) {
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ip_stripoptions(m, (struct mbuf *)0);
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off0 = sizeof(struct ip);
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}
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if (m->m_len < sizeof (struct tcpiphdr)) {
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if ((m = m_pullup(m, sizeof (struct tcpiphdr))) == 0) {
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tcpstat.tcps_rcvshort++;
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return;
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}
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}
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ip = mtod(m, struct ip *);
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ipov = (struct ipovly *)ip;
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th = (struct tcphdr *)((caddr_t)ip + off0);
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tlen = ip->ip_len;
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if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
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if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
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th->th_sum = m->m_pkthdr.csum_data;
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else
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th->th_sum = in_pseudo(ip->ip_src.s_addr,
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ip->ip_dst.s_addr, htonl(m->m_pkthdr.csum_data +
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ip->ip_len + IPPROTO_TCP));
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th->th_sum ^= 0xffff;
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} else {
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/*
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* Checksum extended TCP header and data.
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* Get IP and TCP header together in first mbuf.
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* Note: IP leaves IP header in first mbuf.
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*/
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len = sizeof (struct ip) + tlen;
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bzero(ipov->ih_x1, sizeof(ipov->ih_x1));
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ipov->ih_len = (u_short)tlen;
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ipov->ih_len = htons(ipov->ih_len);
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th->th_sum = in_cksum(m, len);
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}
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if (th->th_sum) {
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tcpstat.tcps_rcvbadsum++;
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goto drop;
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}
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if (off0 > sizeof (struct ip)) {
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ip_stripoptions(m, (struct mbuf *)0);
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off0 = sizeof(struct ip);
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}
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if (m->m_len < sizeof (struct tcpiphdr)) {
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if ((m = m_pullup(m, sizeof (struct tcpiphdr))) == 0) {
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tcpstat.tcps_rcvshort++;
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return;
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}
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}
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ip = mtod(m, struct ip *);
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ipov = (struct ipovly *)ip;
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th = (struct tcphdr *)((caddr_t)ip + off0);
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tlen = ip->ip_len;
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if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
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if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
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th->th_sum = m->m_pkthdr.csum_data;
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else
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th->th_sum = in_pseudo(ip->ip_src.s_addr,
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ip->ip_dst.s_addr,
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htonl(m->m_pkthdr.csum_data +
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ip->ip_len +
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IPPROTO_TCP));
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th->th_sum ^= 0xffff;
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} else {
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/*
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* Checksum extended TCP header and data.
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*/
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len = sizeof (struct ip) + tlen;
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bzero(ipov->ih_x1, sizeof(ipov->ih_x1));
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ipov->ih_len = (u_short)tlen;
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ipov->ih_len = htons(ipov->ih_len);
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th->th_sum = in_cksum(m, len);
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}
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if (th->th_sum) {
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tcpstat.tcps_rcvbadsum++;
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goto drop;
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}
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#ifdef INET6
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/* Re-initialization for later version check */
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ip->ip_v = IPVERSION;
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/* Re-initialization for later version check */
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ip->ip_v = IPVERSION;
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#endif
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}
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}
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/*
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* Check that TCP offset makes sense,
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@ -464,24 +462,22 @@ tcp_input(m, off0)
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}
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tlen -= off; /* tlen is used instead of ti->ti_len */
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if (off > sizeof (struct tcphdr)) {
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#ifdef INET6
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if (isipv6) {
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IP6_EXTHDR_CHECK(m, off0, off, );
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ip6 = mtod(m, struct ip6_hdr *);
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th = (struct tcphdr *)((caddr_t)ip6 + off0);
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} else
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#endif /* INET6 */
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{
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if (m->m_len < sizeof(struct ip) + off) {
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if ((m = m_pullup(m, sizeof (struct ip) + off)) == 0) {
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tcpstat.tcps_rcvshort++;
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return;
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} else {
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if (m->m_len < sizeof(struct ip) + off) {
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if ((m = m_pullup(m, sizeof (struct ip) + off))
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== 0) {
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tcpstat.tcps_rcvshort++;
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return;
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}
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ip = mtod(m, struct ip *);
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ipov = (struct ipovly *)ip;
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th = (struct tcphdr *)((caddr_t)ip + off0);
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}
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ip = mtod(m, struct ip *);
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ipov = (struct ipovly *)ip;
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th = (struct tcphdr *)((caddr_t)ip + off0);
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}
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}
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optlen = off - sizeof (struct tcphdr);
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optp = (u_char *)(th + 1);
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}
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@ -526,60 +522,50 @@ tcp_input(m, off0)
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headlocked = 1;
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findpcb:
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/* IPFIREWALL_FORWARD section */
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if (next_hop != NULL
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#ifdef INET6
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&& isipv6 == NULL /* IPv6 support is not yet */
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#endif /* INET6 */
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) {
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if (next_hop != NULL && isipv6 == 0) { /* IPv6 support is not yet */
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/*
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* Transparently forwarded. Pretend to be the destination.
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* already got one like this?
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*/
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inp = in_pcblookup_hash(&tcbinfo, ip->ip_src, th->th_sport,
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ip->ip_dst, th->th_dport, 0, m->m_pkthdr.rcvif);
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ip->ip_dst, th->th_dport,
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0, m->m_pkthdr.rcvif);
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if (!inp) {
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/*
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* No, then it's new. Try find the ambushing socket
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*/
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if (next_hop->sin_port == 0) {
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inp = in_pcblookup_hash(&tcbinfo, ip->ip_src,
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th->th_sport, next_hop->sin_addr,
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th->th_dport, 1, m->m_pkthdr.rcvif);
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} else {
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inp = in_pcblookup_hash(&tcbinfo,
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ip->ip_src, th->th_sport,
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next_hop->sin_addr,
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ntohs(next_hop->sin_port), 1,
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m->m_pkthdr.rcvif);
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}
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/* It's new. Try find the ambushing socket. */
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inp = in_pcblookup_hash(&tcbinfo,
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ip->ip_src, th->th_sport,
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next_hop->sin_addr,
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next_hop->sin_port ?
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ntohs(next_hop->sin_port) :
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th->th_dport,
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1, m->m_pkthdr.rcvif);
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}
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} else
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{
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#ifdef INET6
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if (isipv6)
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inp = in6_pcblookup_hash(&tcbinfo, &ip6->ip6_src, th->th_sport,
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&ip6->ip6_dst, th->th_dport, 1,
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m->m_pkthdr.rcvif);
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else
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#endif /* INET6 */
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inp = in_pcblookup_hash(&tcbinfo, ip->ip_src, th->th_sport,
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ip->ip_dst, th->th_dport, 1, m->m_pkthdr.rcvif);
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} else {
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if (isipv6)
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inp = in6_pcblookup_hash(&tcbinfo,
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&ip6->ip6_src, th->th_sport,
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&ip6->ip6_dst, th->th_dport,
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1, m->m_pkthdr.rcvif);
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else
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inp = in_pcblookup_hash(&tcbinfo,
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ip->ip_src, th->th_sport,
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ip->ip_dst, th->th_dport,
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1, m->m_pkthdr.rcvif);
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}
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#ifdef IPSEC
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#ifdef INET6
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if (isipv6) {
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if (inp != NULL && ipsec6_in_reject_so(m, inp->inp_socket)) {
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ipsec6stat.in_polvio++;
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goto drop;
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}
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} else
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#endif /* INET6 */
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if (inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) {
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ipsecstat.in_polvio++;
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goto drop;
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} else {
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if (inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) {
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ipsecstat.in_polvio++;
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goto drop;
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}
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}
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#endif /*IPSEC*/
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#endif
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/*
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* If the state is CLOSED (i.e., TCB does not exist) then
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@ -591,34 +577,32 @@ tcp_input(m, off0)
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if (log_in_vain) {
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#ifdef INET6
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char dbuf[INET6_ADDRSTRLEN], sbuf[INET6_ADDRSTRLEN];
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#else /* INET6 */
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#else
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char dbuf[4*sizeof "123"], sbuf[4*sizeof "123"];
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#endif /* INET6 */
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#endif
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#ifdef INET6
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if (isipv6) {
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strcpy(dbuf, ip6_sprintf(&ip6->ip6_dst));
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strcpy(sbuf, ip6_sprintf(&ip6->ip6_src));
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} else
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#endif
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{
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strcpy(dbuf, inet_ntoa(ip->ip_dst));
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strcpy(sbuf, inet_ntoa(ip->ip_src));
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}
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} else {
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strcpy(dbuf, inet_ntoa(ip->ip_dst));
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strcpy(sbuf, inet_ntoa(ip->ip_src));
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}
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switch (log_in_vain) {
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case 1:
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if(thflags & TH_SYN)
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if (thflags & TH_SYN)
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log(LOG_INFO,
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"Connection attempt to TCP %s:%d from %s:%d\n",
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dbuf, ntohs(th->th_dport),
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sbuf,
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ntohs(th->th_sport));
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"Connection attempt to TCP %s:%d "
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"from %s:%d\n",
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dbuf, ntohs(th->th_dport), sbuf,
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ntohs(th->th_sport));
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break;
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case 2:
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log(LOG_INFO,
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"Connection attempt to TCP %s:%d from %s:%d flags:0x%x\n",
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dbuf, ntohs(th->th_dport), sbuf,
|
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ntohs(th->th_sport), thflags);
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"Connection attempt to TCP %s:%d "
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"from %s:%d flags:0x%x\n",
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dbuf, ntohs(th->th_dport), sbuf,
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ntohs(th->th_sport), thflags);
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break;
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default:
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break;
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@ -666,13 +650,12 @@ tcp_input(m, off0)
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#ifdef TCPDEBUG
|
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if (so->so_options & SO_DEBUG) {
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ostate = tp->t_state;
|
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#ifdef INET6
|
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if (isipv6)
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bcopy((char *)ip6, (char *)tcp_saveipgen,
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sizeof(*ip6));
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sizeof(*ip6));
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else
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#endif /* INET6 */
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bcopy((char *)ip, (char *)tcp_saveipgen, sizeof(*ip));
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bcopy((char *)ip, (char *)tcp_saveipgen,
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sizeof(*ip));
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tcp_savetcp = *th;
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}
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#endif
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@ -681,14 +664,12 @@ tcp_input(m, off0)
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goto after_listen;
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#ifdef INET6
|
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inc.inc_isipv6 = isipv6;
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#endif
|
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if (isipv6) {
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inc.inc6_faddr = ip6->ip6_src;
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inc.inc6_laddr = ip6->ip6_dst;
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inc.inc6_route.ro_rt = NULL; /* XXX */
|
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|
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} else
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#endif /* INET6 */
|
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{
|
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} else {
|
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inc.inc_faddr = ip->ip_src;
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inc.inc_laddr = ip->ip_dst;
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inc.inc_route.ro_rt = NULL; /* XXX */
|
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@ -817,15 +798,14 @@ tcp_input(m, off0)
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* Don't bother responding if the destination was a broadcast.
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*/
|
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if (th->th_dport == th->th_sport) {
|
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#ifdef INET6
|
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if (isipv6) {
|
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if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
|
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&ip6->ip6_src))
|
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goto drop;
|
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} else
|
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#endif /* INET6 */
|
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if (ip->ip_dst.s_addr == ip->ip_src.s_addr)
|
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goto drop;
|
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} else {
|
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if (ip->ip_dst.s_addr == ip->ip_src.s_addr)
|
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goto drop;
|
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}
|
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}
|
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/*
|
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* RFC1122 4.2.3.10, p. 104: discard bcast/mcast SYN
|
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@ -836,18 +816,17 @@ tcp_input(m, off0)
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*/
|
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if (m->m_flags & (M_BCAST|M_MCAST))
|
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goto drop;
|
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#ifdef INET6
|
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if (isipv6) {
|
||||
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
|
||||
IN6_IS_ADDR_MULTICAST(&ip6->ip6_src))
|
||||
goto drop;
|
||||
} else
|
||||
#endif
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
} else {
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
}
|
||||
/*
|
||||
* SYN appears to be valid; create compressed TCP state
|
||||
* for syncache, or perform t/tcp connection.
|
||||
@ -884,20 +863,13 @@ tcp_input(m, off0)
|
||||
* segment. Otherwise must send ACK now in case
|
||||
* the other side is slow starting.
|
||||
*/
|
||||
if (DELAY_ACK(tp) && ((thflags & TH_FIN) ||
|
||||
(tlen != 0 &&
|
||||
#ifdef INET6
|
||||
((isipv6 && in6_localaddr(&inp->in6p_faddr))
|
||||
||
|
||||
(!isipv6 &&
|
||||
#endif
|
||||
in_localaddr(inp->inp_faddr)
|
||||
#ifdef INET6
|
||||
))
|
||||
#endif
|
||||
))) {
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
tcp_timer_delack, tp);
|
||||
if (DELAY_ACK(tp) &&
|
||||
((thflags & TH_FIN) ||
|
||||
(tlen != 0 &&
|
||||
((isipv6 && in6_localaddr(&inp->in6p_faddr)) ||
|
||||
(!isipv6 && in_localaddr(inp->inp_faddr)))))) {
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
tcp_timer_delack, tp);
|
||||
tp->t_flags |= TF_NEEDSYN;
|
||||
} else
|
||||
tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN);
|
||||
@ -984,7 +956,7 @@ tcp_input(m, off0)
|
||||
* proposal of the tcplw@cray.com list (Braden 1993/04/26).
|
||||
*/
|
||||
if ((to.to_flags & TOF_TS) != 0 &&
|
||||
SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
|
||||
SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
|
||||
tp->ts_recent_age = ticks;
|
||||
tp->ts_recent = to.to_tsval;
|
||||
}
|
||||
@ -1017,7 +989,8 @@ tcp_input(m, off0)
|
||||
ticks - to.to_tsecr + 1);
|
||||
else if (tp->t_rtttime &&
|
||||
SEQ_GT(th->th_ack, tp->t_rtseq))
|
||||
tcp_xmit_timer(tp, ticks - tp->t_rtttime);
|
||||
tcp_xmit_timer(tp,
|
||||
ticks - tp->t_rtttime);
|
||||
acked = th->th_ack - tp->snd_una;
|
||||
tcpstat.tcps_rcvackpack++;
|
||||
tcpstat.tcps_rcvackbyte += acked;
|
||||
@ -1223,15 +1196,16 @@ tcp_input(m, off0)
|
||||
tcp_timer_keep, tp);
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* Received initial SYN in SYN-SENT[*] state => simul-
|
||||
* taneous open. If segment contains CC option and there is
|
||||
* a cached CC, apply TAO test; if it succeeds, connection is
|
||||
* half-synchronized. Otherwise, do 3-way handshake:
|
||||
* SYN-SENT -> SYN-RECEIVED
|
||||
* SYN-SENT* -> SYN-RECEIVED*
|
||||
* If there was no CC option, clear cached CC value.
|
||||
*/
|
||||
/*
|
||||
* Received initial SYN in SYN-SENT[*] state =>
|
||||
* simultaneous open. If segment contains CC option
|
||||
* and there is a cached CC, apply TAO test.
|
||||
* If it succeeds, connection is * half-synchronized.
|
||||
* Otherwise, do 3-way handshake:
|
||||
* SYN-SENT -> SYN-RECEIVED
|
||||
* SYN-SENT* -> SYN-RECEIVED*
|
||||
* If there was no CC option, clear cached CC value.
|
||||
*/
|
||||
tp->t_flags |= TF_ACKNOW;
|
||||
callout_stop(tp->tt_rexmt);
|
||||
if (to.to_flags & TOF_CC) {
|
||||
@ -1282,15 +1256,17 @@ tcp_input(m, off0)
|
||||
tp->snd_wl1 = th->th_seq - 1;
|
||||
tp->rcv_up = th->th_seq;
|
||||
/*
|
||||
* Client side of transaction: already sent SYN and data.
|
||||
* If the remote host used T/TCP to validate the SYN,
|
||||
* our data will be ACK'd; if so, enter normal data segment
|
||||
* processing in the middle of step 5, ack processing.
|
||||
* Otherwise, goto step 6.
|
||||
* Client side of transaction: already sent SYN and data.
|
||||
* If the remote host used T/TCP to validate the SYN,
|
||||
* our data will be ACK'd; if so, enter normal data segment
|
||||
* processing in the middle of step 5, ack processing.
|
||||
* Otherwise, goto step 6.
|
||||
*/
|
||||
if (thflags & TH_ACK)
|
||||
goto process_ACK;
|
||||
|
||||
goto step6;
|
||||
|
||||
/*
|
||||
* If the state is LAST_ACK or CLOSING or TIME_WAIT:
|
||||
* if segment contains a SYN and CC [not CC.NEW] option:
|
||||
@ -1701,8 +1677,9 @@ tcp_input(m, off0)
|
||||
u_int win =
|
||||
min(tp->snd_wnd, tp->snd_cwnd) / 2 /
|
||||
tp->t_maxseg;
|
||||
if (tcp_do_newreno && SEQ_LT(th->th_ack,
|
||||
tp->snd_recover)) {
|
||||
if (tcp_do_newreno &&
|
||||
SEQ_LT(th->th_ack,
|
||||
tp->snd_recover)) {
|
||||
/* False retransmit, should not
|
||||
* cut window
|
||||
*/
|
||||
@ -1721,7 +1698,7 @@ tcp_input(m, off0)
|
||||
tp->snd_cwnd = tp->t_maxseg;
|
||||
(void) tcp_output(tp);
|
||||
tp->snd_cwnd = tp->snd_ssthresh +
|
||||
tp->t_maxseg * tp->t_dupacks;
|
||||
tp->t_maxseg * tp->t_dupacks;
|
||||
if (SEQ_GT(onxt, tp->snd_nxt))
|
||||
tp->snd_nxt = onxt;
|
||||
goto drop;
|
||||
@ -1738,34 +1715,48 @@ tcp_input(m, off0)
|
||||
* If the congestion window was inflated to account
|
||||
* for the other side's cached packets, retract it.
|
||||
*/
|
||||
if (tcp_do_newreno == 0) {
|
||||
if (tcp_do_newreno) {
|
||||
int is_partialack = SEQ_LT(th->th_ack, tp->snd_recover);
|
||||
if (tp->t_dupacks >= tcprexmtthresh) {
|
||||
if (is_partialack) {
|
||||
tcp_newreno_partial_ack(tp, th);
|
||||
} else {
|
||||
/*
|
||||
* Window inflation should have left us
|
||||
* with approximately snd_ssthresh
|
||||
* outstanding data.
|
||||
* But in case we would be inclined to
|
||||
* send a burst, better to do it via
|
||||
* the slow start mechanism.
|
||||
*/
|
||||
if (SEQ_GT(th->th_ack +
|
||||
tp->snd_ssthresh,
|
||||
tp->snd_max))
|
||||
tp->snd_cwnd = tp->snd_max -
|
||||
th->th_ack +
|
||||
tp->t_maxseg;
|
||||
else
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
}
|
||||
}
|
||||
/*
|
||||
* Reset dupacks, except on partial acks in
|
||||
* fast recovery.
|
||||
*/
|
||||
if (!(tp->t_dupacks >= tcprexmtthresh && is_partialack))
|
||||
tp->t_dupacks = 0;
|
||||
} else {
|
||||
if (tp->t_dupacks >= tcprexmtthresh &&
|
||||
tp->snd_cwnd > tp->snd_ssthresh)
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
tp->t_dupacks = 0;
|
||||
} else if (tp->t_dupacks >= tcprexmtthresh &&
|
||||
!tcp_newreno(tp, th)) {
|
||||
/*
|
||||
* Window inflation should have left us with approx.
|
||||
* snd_ssthresh outstanding data. But in case we
|
||||
* would be inclined to send a burst, better to do
|
||||
* it via the slow start mechanism.
|
||||
*/
|
||||
if (SEQ_GT(th->th_ack + tp->snd_ssthresh, tp->snd_max))
|
||||
tp->snd_cwnd =
|
||||
tp->snd_max - th->th_ack + tp->t_maxseg;
|
||||
else
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
tp->t_dupacks = 0;
|
||||
}
|
||||
if (tp->t_dupacks < tcprexmtthresh)
|
||||
tp->snd_cwnd > tp->snd_ssthresh)
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
tp->t_dupacks = 0;
|
||||
}
|
||||
if (SEQ_GT(th->th_ack, tp->snd_max)) {
|
||||
tcpstat.tcps_rcvacktoomuch++;
|
||||
goto dropafterack;
|
||||
}
|
||||
/*
|
||||
* If we reach this point, ACK is not a duplicate,
|
||||
* If we reach this point, ACK is not a duplicate,
|
||||
* i.e., it ACKs something we sent.
|
||||
*/
|
||||
if (tp->t_flags & TF_NEEDSYN) {
|
||||
@ -1858,7 +1849,7 @@ tcp_input(m, off0)
|
||||
* in NewReno fast recovery mode, so we leave the congestion
|
||||
* window alone.
|
||||
*/
|
||||
if (tcp_do_newreno == 0 || tp->t_dupacks == 0)
|
||||
if (!tcp_do_newreno || tp->t_dupacks == 0)
|
||||
tp->snd_cwnd = min(cw + incr,TCP_MAXWIN<<tp->snd_scale);
|
||||
}
|
||||
if (acked > so->so_snd.sb_cc) {
|
||||
@ -2022,7 +2013,7 @@ tcp_input(m, off0)
|
||||
)
|
||||
tcp_pulloutofband(so, th, m,
|
||||
drop_hdrlen); /* hdr drop is delayed */
|
||||
} else
|
||||
} else {
|
||||
/*
|
||||
* If no out of band data is expected,
|
||||
* pull receive urgent pointer along
|
||||
@ -2030,6 +2021,7 @@ tcp_input(m, off0)
|
||||
*/
|
||||
if (SEQ_GT(tp->rcv_nxt, tp->rcv_up))
|
||||
tp->rcv_up = tp->rcv_nxt;
|
||||
}
|
||||
dodata: /* XXX */
|
||||
KASSERT(headlocked, ("headlocked"));
|
||||
INP_INFO_WUNLOCK(&tcbinfo);
|
||||
@ -2042,25 +2034,27 @@ tcp_input(m, off0)
|
||||
* case PRU_RCVD). If a FIN has already been received on this
|
||||
* connection then we just ignore the text.
|
||||
*/
|
||||
if ((tlen || (thflags&TH_FIN)) &&
|
||||
if ((tlen || (thflags & TH_FIN)) &&
|
||||
TCPS_HAVERCVDFIN(tp->t_state) == 0) {
|
||||
m_adj(m, drop_hdrlen); /* delayed header drop */
|
||||
/*
|
||||
* Insert segment which inludes th into reassembly queue of tcp with
|
||||
* control block tp. Return TH_FIN if reassembly now includes
|
||||
* a segment with FIN. This handle the common case inline (segment
|
||||
* is the next to be received on an established connection, and the
|
||||
* queue is empty), avoiding linkage into and removal from the queue
|
||||
* and repetition of various conversions.
|
||||
* Set DELACK for segments received in order, but ack immediately
|
||||
* when segments are out of order (so fast retransmit can work).
|
||||
* Insert segment which includes th into TCP reassembly queue
|
||||
* with control block tp. Set thflags to whether reassembly now
|
||||
* includes a segment with FIN. This handles the common case
|
||||
* inline (segment is the next to be received on an established
|
||||
* connection, and the queue is empty), avoiding linkage into
|
||||
* and removal from the queue and repetition of various
|
||||
* conversions.
|
||||
* Set DELACK for segments received in order, but ack
|
||||
* immediately when segments are out of order (so
|
||||
* fast retransmit can work).
|
||||
*/
|
||||
if (th->th_seq == tp->rcv_nxt &&
|
||||
LIST_EMPTY(&tp->t_segq) &&
|
||||
TCPS_HAVEESTABLISHED(tp->t_state)) {
|
||||
if (DELAY_ACK(tp))
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
tcp_timer_delack, tp);
|
||||
tcp_timer_delack, tp);
|
||||
else
|
||||
tp->t_flags |= TF_ACKNOW;
|
||||
tp->rcv_nxt += tlen;
|
||||
@ -2094,11 +2088,11 @@ tcp_input(m, off0)
|
||||
if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
|
||||
socantrcvmore(so);
|
||||
/*
|
||||
* If connection is half-synchronized
|
||||
* (ie NEEDSYN flag on) then delay ACK,
|
||||
* so it may be piggybacked when SYN is sent.
|
||||
* Otherwise, since we received a FIN then no
|
||||
* more input can be expected, send ACK now.
|
||||
* If connection is half-synchronized
|
||||
* (ie NEEDSYN flag on) then delay ACK,
|
||||
* so it may be piggybacked when SYN is sent.
|
||||
* Otherwise, since we received a FIN then no
|
||||
* more input can be expected, send ACK now.
|
||||
*/
|
||||
if (DELAY_ACK(tp) && (tp->t_flags & TF_NEEDSYN))
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
@ -2217,18 +2211,17 @@ tcp_input(m, off0)
|
||||
*/
|
||||
if ((thflags & TH_RST) || m->m_flags & (M_BCAST|M_MCAST))
|
||||
goto drop;
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
|
||||
IN6_IS_ADDR_MULTICAST(&ip6->ip6_src))
|
||||
goto drop;
|
||||
} else
|
||||
#endif /* INET6 */
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
} else {
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
}
|
||||
/* IPv6 anycast check is done at tcp6_input() */
|
||||
|
||||
/*
|
||||
@ -2518,35 +2511,27 @@ tcp_mss(tp, offer)
|
||||
struct ifnet *ifp;
|
||||
register int rtt, mss;
|
||||
u_long bufsize;
|
||||
struct inpcb *inp;
|
||||
struct inpcb *inp = tp->t_inpcb;
|
||||
struct socket *so;
|
||||
struct rmxp_tao *taop;
|
||||
int origoffer = offer;
|
||||
#ifdef INET6
|
||||
int isipv6;
|
||||
int min_protoh;
|
||||
int isipv6 = ((inp->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
size_t min_protoh = isipv6 ?
|
||||
sizeof (struct ip6_hdr) + sizeof (struct tcphdr) :
|
||||
sizeof (struct tcpiphdr);
|
||||
#else
|
||||
const int isipv6 = 0;
|
||||
const size_t min_protoh = sizeof (struct tcpiphdr);
|
||||
#endif
|
||||
|
||||
inp = tp->t_inpcb;
|
||||
#ifdef INET6
|
||||
isipv6 = ((inp->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
min_protoh = isipv6 ? sizeof (struct ip6_hdr) + sizeof (struct tcphdr)
|
||||
: sizeof (struct tcpiphdr);
|
||||
#else
|
||||
#define min_protoh (sizeof (struct tcpiphdr))
|
||||
#endif
|
||||
#ifdef INET6
|
||||
if (isipv6)
|
||||
rt = tcp_rtlookup6(&inp->inp_inc);
|
||||
else
|
||||
#endif
|
||||
rt = tcp_rtlookup(&inp->inp_inc);
|
||||
rt = tcp_rtlookup(&inp->inp_inc);
|
||||
if (rt == NULL) {
|
||||
tp->t_maxopd = tp->t_maxseg =
|
||||
#ifdef INET6
|
||||
isipv6 ? tcp_v6mssdflt :
|
||||
#endif /* INET6 */
|
||||
tcp_mssdflt;
|
||||
isipv6 ? tcp_v6mssdflt : tcp_mssdflt;
|
||||
return;
|
||||
}
|
||||
ifp = rt->rt_ifp;
|
||||
@ -2564,11 +2549,7 @@ tcp_mss(tp, offer)
|
||||
* in this case we use tcp_mssdflt.
|
||||
*/
|
||||
if (offer == 0)
|
||||
offer =
|
||||
#ifdef INET6
|
||||
isipv6 ? tcp_v6mssdflt :
|
||||
#endif /* INET6 */
|
||||
tcp_mssdflt;
|
||||
offer = isipv6 ? tcp_v6mssdflt : tcp_mssdflt;
|
||||
else
|
||||
/*
|
||||
* Sanity check: make sure that maxopd will be large
|
||||
@ -2612,25 +2593,17 @@ tcp_mss(tp, offer)
|
||||
*/
|
||||
if (rt->rt_rmx.rmx_mtu)
|
||||
mss = rt->rt_rmx.rmx_mtu - min_protoh;
|
||||
else
|
||||
{
|
||||
mss =
|
||||
#ifdef INET6
|
||||
(isipv6 ? nd_ifinfo[rt->rt_ifp->if_index].linkmtu :
|
||||
#endif
|
||||
ifp->if_mtu
|
||||
#ifdef INET6
|
||||
)
|
||||
#endif
|
||||
- min_protoh;
|
||||
#ifdef INET6
|
||||
else {
|
||||
if (isipv6) {
|
||||
mss = nd_ifinfo[rt->rt_ifp->if_index].linkmtu -
|
||||
min_protoh;
|
||||
if (!in6_localaddr(&inp->in6p_faddr))
|
||||
mss = min(mss, tcp_v6mssdflt);
|
||||
} else
|
||||
#endif
|
||||
if (!in_localaddr(inp->inp_faddr))
|
||||
mss = min(mss, tcp_mssdflt);
|
||||
} else {
|
||||
mss = ifp->if_mtu - min_protoh;
|
||||
if (!in_localaddr(inp->inp_faddr))
|
||||
mss = min(mss, tcp_mssdflt);
|
||||
}
|
||||
}
|
||||
mss = min(mss, offer);
|
||||
/*
|
||||
@ -2700,16 +2673,8 @@ tcp_mss(tp, offer)
|
||||
* Set the slow-start flight size depending on whether this
|
||||
* is a local network or not.
|
||||
*/
|
||||
if (
|
||||
#ifdef INET6
|
||||
(isipv6 && in6_localaddr(&inp->in6p_faddr)) ||
|
||||
(!isipv6 &&
|
||||
#endif
|
||||
in_localaddr(inp->inp_faddr)
|
||||
#ifdef INET6
|
||||
)
|
||||
#endif
|
||||
)
|
||||
if ((isipv6 && in6_localaddr(&inp->in6p_faddr)) ||
|
||||
(!isipv6 && in_localaddr(inp->inp_faddr)))
|
||||
tp->snd_cwnd = mss * ss_fltsz_local;
|
||||
else
|
||||
tp->snd_cwnd = mss * ss_fltsz;
|
||||
@ -2735,68 +2700,55 @@ tcp_mssopt(tp)
|
||||
{
|
||||
struct rtentry *rt;
|
||||
#ifdef INET6
|
||||
int isipv6;
|
||||
int min_protoh;
|
||||
int isipv6 = ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
size_t min_protoh = isipv6 ?
|
||||
sizeof (struct ip6_hdr) + sizeof (struct tcphdr) :
|
||||
sizeof (struct tcpiphdr);
|
||||
#else
|
||||
const int isipv6 = 0;
|
||||
const size_t min_protoh = sizeof (struct tcpiphdr);
|
||||
#endif
|
||||
|
||||
#ifdef INET6
|
||||
isipv6 = ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
min_protoh = isipv6 ? sizeof (struct ip6_hdr) + sizeof (struct tcphdr)
|
||||
: sizeof (struct tcpiphdr);
|
||||
#else
|
||||
#define min_protoh (sizeof (struct tcpiphdr))
|
||||
#endif
|
||||
#ifdef INET6
|
||||
if (isipv6)
|
||||
rt = tcp_rtlookup6(&tp->t_inpcb->inp_inc);
|
||||
else
|
||||
#endif /* INET6 */
|
||||
rt = tcp_rtlookup(&tp->t_inpcb->inp_inc);
|
||||
rt = tcp_rtlookup(&tp->t_inpcb->inp_inc);
|
||||
if (rt == NULL)
|
||||
return
|
||||
#ifdef INET6
|
||||
isipv6 ? tcp_v6mssdflt :
|
||||
#endif /* INET6 */
|
||||
tcp_mssdflt;
|
||||
return (isipv6 ? tcp_v6mssdflt : tcp_mssdflt);
|
||||
|
||||
return rt->rt_ifp->if_mtu - min_protoh;
|
||||
return (rt->rt_ifp->if_mtu - min_protoh);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Checks for partial ack. If partial ack arrives, force the retransmission
|
||||
* of the next unacknowledged segment, do not clear tp->t_dupacks, and return
|
||||
* 1. By setting snd_nxt to ti_ack, this forces retransmission timer to
|
||||
* be started again. If the ack advances at least to tp->snd_recover, return 0.
|
||||
* On a partial ack arrives, force the retransmission of the
|
||||
* next unacknowledged segment. Do not clear tp->t_dupacks.
|
||||
* By setting snd_nxt to ti_ack, this forces retransmission timer to
|
||||
* be started again.
|
||||
*/
|
||||
static int
|
||||
tcp_newreno(tp, th)
|
||||
static void
|
||||
tcp_newreno_partial_ack(tp, th)
|
||||
struct tcpcb *tp;
|
||||
struct tcphdr *th;
|
||||
{
|
||||
if (SEQ_LT(th->th_ack, tp->snd_recover)) {
|
||||
tcp_seq onxt = tp->snd_nxt;
|
||||
u_long ocwnd = tp->snd_cwnd;
|
||||
tcp_seq onxt = tp->snd_nxt;
|
||||
u_long ocwnd = tp->snd_cwnd;
|
||||
|
||||
callout_stop(tp->tt_rexmt);
|
||||
tp->t_rtttime = 0;
|
||||
tp->snd_nxt = th->th_ack;
|
||||
/*
|
||||
* Set snd_cwnd to one segment beyond acknowledged offset
|
||||
* (tp->snd_una has not yet been updated when this function
|
||||
* is called)
|
||||
*/
|
||||
tp->snd_cwnd = tp->t_maxseg + (th->th_ack - tp->snd_una);
|
||||
(void) tcp_output(tp);
|
||||
tp->snd_cwnd = ocwnd;
|
||||
if (SEQ_GT(onxt, tp->snd_nxt))
|
||||
tp->snd_nxt = onxt;
|
||||
/*
|
||||
* Partial window deflation. Relies on fact that tp->snd_una
|
||||
* not updated yet.
|
||||
*/
|
||||
tp->snd_cwnd -= (th->th_ack - tp->snd_una - tp->t_maxseg);
|
||||
return (1);
|
||||
}
|
||||
return (0);
|
||||
callout_stop(tp->tt_rexmt);
|
||||
tp->t_rtttime = 0;
|
||||
tp->snd_nxt = th->th_ack;
|
||||
/*
|
||||
* Set snd_cwnd to one segment beyond acknowledged offset.
|
||||
* (tp->snd_una has not yet been updated when this function is called.)
|
||||
*/
|
||||
tp->snd_cwnd = tp->t_maxseg + (th->th_ack - tp->snd_una);
|
||||
(void) tcp_output(tp);
|
||||
tp->snd_cwnd = ocwnd;
|
||||
if (SEQ_GT(onxt, tp->snd_nxt))
|
||||
tp->snd_nxt = onxt;
|
||||
/*
|
||||
* Partial window deflation. Relies on fact that tp->snd_una
|
||||
* not updated yet.
|
||||
*/
|
||||
tp->snd_cwnd -= (th->th_ack - tp->snd_una - tp->t_maxseg);
|
||||
}
|
||||
|
@ -68,32 +68,25 @@
|
||||
#include <netinet/ip_icmp.h> /* for ICMP_BANDLIM */
|
||||
#include <netinet/icmp_var.h> /* for ICMP_BANDLIM */
|
||||
#include <netinet/ip_var.h>
|
||||
#ifdef INET6
|
||||
#include <netinet/ip6.h>
|
||||
#include <netinet/icmp6.h>
|
||||
#include <netinet6/in6_pcb.h>
|
||||
#include <netinet6/ip6_var.h>
|
||||
#include <netinet6/nd6.h>
|
||||
#endif
|
||||
#include <netinet/tcp.h>
|
||||
#include <netinet/tcp_fsm.h>
|
||||
#include <netinet/tcp_seq.h>
|
||||
#include <netinet/tcp_timer.h>
|
||||
#include <netinet/tcp_var.h>
|
||||
#ifdef INET6
|
||||
#include <netinet6/tcp6_var.h>
|
||||
#endif
|
||||
#include <netinet/tcpip.h>
|
||||
#ifdef TCPDEBUG
|
||||
#include <netinet/tcp_debug.h>
|
||||
|
||||
#endif /* TCPDEBUG */
|
||||
|
||||
#ifdef IPSEC
|
||||
#include <netinet6/ipsec.h>
|
||||
#ifdef INET6
|
||||
#include <netinet6/ipsec6.h>
|
||||
#endif
|
||||
#include <netkey/key.h>
|
||||
#endif /*IPSEC*/
|
||||
|
||||
@ -101,7 +94,7 @@
|
||||
|
||||
MALLOC_DEFINE(M_TSEGQ, "tseg_qent", "TCP segment queue entry");
|
||||
|
||||
static int tcprexmtthresh = 3;
|
||||
static const int tcprexmtthresh = 3;
|
||||
tcp_cc tcp_ccgen;
|
||||
|
||||
struct tcpstat tcpstat;
|
||||
@ -138,7 +131,7 @@ static void tcp_pulloutofband(struct socket *,
|
||||
static int tcp_reass(struct tcpcb *, struct tcphdr *, int *,
|
||||
struct mbuf *);
|
||||
static void tcp_xmit_timer(struct tcpcb *, int);
|
||||
static int tcp_newreno(struct tcpcb *, struct tcphdr *);
|
||||
static void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
|
||||
|
||||
/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
|
||||
#ifdef INET6
|
||||
@ -350,29 +343,35 @@ tcp_input(m, off0)
|
||||
struct rmxp_tao *taop; /* pointer to our TAO cache entry */
|
||||
struct rmxp_tao tao_noncached; /* in case there's no cached entry */
|
||||
int headlocked = 0;
|
||||
struct sockaddr_in *next_hop = NULL;
|
||||
int rstreason; /* For badport_bandlim accounting purposes */
|
||||
|
||||
struct ip6_hdr *ip6 = NULL;
|
||||
#ifdef INET6
|
||||
int isipv6;
|
||||
#else
|
||||
const int isipv6 = 0;
|
||||
#endif
|
||||
|
||||
#ifdef TCPDEBUG
|
||||
/*
|
||||
* The size of tcp_saveipgen must be the size of the max ip header,
|
||||
* now IPv6.
|
||||
*/
|
||||
u_char tcp_saveipgen[40];
|
||||
/* the size of the above must be of max ip header, now IPv6 */
|
||||
struct tcphdr tcp_savetcp;
|
||||
short ostate = 0;
|
||||
#endif
|
||||
#ifdef INET6
|
||||
struct ip6_hdr *ip6 = NULL;
|
||||
int isipv6;
|
||||
#endif /* INET6 */
|
||||
struct sockaddr_in *next_hop = NULL;
|
||||
|
||||
#ifdef MAC
|
||||
int error;
|
||||
#endif
|
||||
int rstreason; /* For badport_bandlim accounting purposes */
|
||||
|
||||
/* Grab info from MT_TAG mbufs prepended to the chain. */
|
||||
for (;m && m->m_type == MT_TAG; m = m->m_next) {
|
||||
if (m->m_tag_id == PACKET_TAG_IPFORWARD)
|
||||
next_hop = (struct sockaddr_in *)m->m_hdr.mh_data;
|
||||
}
|
||||
|
||||
#ifdef INET6
|
||||
isipv6 = (mtod(m, struct ip *)->ip_v == 6) ? 1 : 0;
|
||||
#endif
|
||||
@ -380,7 +379,6 @@ tcp_input(m, off0)
|
||||
|
||||
tcpstat.tcps_rcvtotal++;
|
||||
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
/* IP6_EXTHDR_CHECK() is already done at tcp6_input() */
|
||||
ip6 = mtod(m, struct ip6_hdr *);
|
||||
@ -403,55 +401,55 @@ tcp_input(m, off0)
|
||||
/* XXX stat */
|
||||
goto drop;
|
||||
}
|
||||
} else
|
||||
#endif /* INET6 */
|
||||
{
|
||||
/*
|
||||
* Get IP and TCP header together in first mbuf.
|
||||
* Note: IP leaves IP header in first mbuf.
|
||||
*/
|
||||
if (off0 > sizeof (struct ip)) {
|
||||
ip_stripoptions(m, (struct mbuf *)0);
|
||||
off0 = sizeof(struct ip);
|
||||
}
|
||||
if (m->m_len < sizeof (struct tcpiphdr)) {
|
||||
if ((m = m_pullup(m, sizeof (struct tcpiphdr))) == 0) {
|
||||
tcpstat.tcps_rcvshort++;
|
||||
return;
|
||||
}
|
||||
}
|
||||
ip = mtod(m, struct ip *);
|
||||
ipov = (struct ipovly *)ip;
|
||||
th = (struct tcphdr *)((caddr_t)ip + off0);
|
||||
tlen = ip->ip_len;
|
||||
|
||||
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
|
||||
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
|
||||
th->th_sum = m->m_pkthdr.csum_data;
|
||||
else
|
||||
th->th_sum = in_pseudo(ip->ip_src.s_addr,
|
||||
ip->ip_dst.s_addr, htonl(m->m_pkthdr.csum_data +
|
||||
ip->ip_len + IPPROTO_TCP));
|
||||
th->th_sum ^= 0xffff;
|
||||
} else {
|
||||
/*
|
||||
* Checksum extended TCP header and data.
|
||||
* Get IP and TCP header together in first mbuf.
|
||||
* Note: IP leaves IP header in first mbuf.
|
||||
*/
|
||||
len = sizeof (struct ip) + tlen;
|
||||
bzero(ipov->ih_x1, sizeof(ipov->ih_x1));
|
||||
ipov->ih_len = (u_short)tlen;
|
||||
ipov->ih_len = htons(ipov->ih_len);
|
||||
th->th_sum = in_cksum(m, len);
|
||||
}
|
||||
if (th->th_sum) {
|
||||
tcpstat.tcps_rcvbadsum++;
|
||||
goto drop;
|
||||
}
|
||||
if (off0 > sizeof (struct ip)) {
|
||||
ip_stripoptions(m, (struct mbuf *)0);
|
||||
off0 = sizeof(struct ip);
|
||||
}
|
||||
if (m->m_len < sizeof (struct tcpiphdr)) {
|
||||
if ((m = m_pullup(m, sizeof (struct tcpiphdr))) == 0) {
|
||||
tcpstat.tcps_rcvshort++;
|
||||
return;
|
||||
}
|
||||
}
|
||||
ip = mtod(m, struct ip *);
|
||||
ipov = (struct ipovly *)ip;
|
||||
th = (struct tcphdr *)((caddr_t)ip + off0);
|
||||
tlen = ip->ip_len;
|
||||
|
||||
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
|
||||
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
|
||||
th->th_sum = m->m_pkthdr.csum_data;
|
||||
else
|
||||
th->th_sum = in_pseudo(ip->ip_src.s_addr,
|
||||
ip->ip_dst.s_addr,
|
||||
htonl(m->m_pkthdr.csum_data +
|
||||
ip->ip_len +
|
||||
IPPROTO_TCP));
|
||||
th->th_sum ^= 0xffff;
|
||||
} else {
|
||||
/*
|
||||
* Checksum extended TCP header and data.
|
||||
*/
|
||||
len = sizeof (struct ip) + tlen;
|
||||
bzero(ipov->ih_x1, sizeof(ipov->ih_x1));
|
||||
ipov->ih_len = (u_short)tlen;
|
||||
ipov->ih_len = htons(ipov->ih_len);
|
||||
th->th_sum = in_cksum(m, len);
|
||||
}
|
||||
if (th->th_sum) {
|
||||
tcpstat.tcps_rcvbadsum++;
|
||||
goto drop;
|
||||
}
|
||||
#ifdef INET6
|
||||
/* Re-initialization for later version check */
|
||||
ip->ip_v = IPVERSION;
|
||||
/* Re-initialization for later version check */
|
||||
ip->ip_v = IPVERSION;
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Check that TCP offset makes sense,
|
||||
@ -464,24 +462,22 @@ tcp_input(m, off0)
|
||||
}
|
||||
tlen -= off; /* tlen is used instead of ti->ti_len */
|
||||
if (off > sizeof (struct tcphdr)) {
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
IP6_EXTHDR_CHECK(m, off0, off, );
|
||||
ip6 = mtod(m, struct ip6_hdr *);
|
||||
th = (struct tcphdr *)((caddr_t)ip6 + off0);
|
||||
} else
|
||||
#endif /* INET6 */
|
||||
{
|
||||
if (m->m_len < sizeof(struct ip) + off) {
|
||||
if ((m = m_pullup(m, sizeof (struct ip) + off)) == 0) {
|
||||
tcpstat.tcps_rcvshort++;
|
||||
return;
|
||||
} else {
|
||||
if (m->m_len < sizeof(struct ip) + off) {
|
||||
if ((m = m_pullup(m, sizeof (struct ip) + off))
|
||||
== 0) {
|
||||
tcpstat.tcps_rcvshort++;
|
||||
return;
|
||||
}
|
||||
ip = mtod(m, struct ip *);
|
||||
ipov = (struct ipovly *)ip;
|
||||
th = (struct tcphdr *)((caddr_t)ip + off0);
|
||||
}
|
||||
ip = mtod(m, struct ip *);
|
||||
ipov = (struct ipovly *)ip;
|
||||
th = (struct tcphdr *)((caddr_t)ip + off0);
|
||||
}
|
||||
}
|
||||
optlen = off - sizeof (struct tcphdr);
|
||||
optp = (u_char *)(th + 1);
|
||||
}
|
||||
@ -526,60 +522,50 @@ tcp_input(m, off0)
|
||||
headlocked = 1;
|
||||
findpcb:
|
||||
/* IPFIREWALL_FORWARD section */
|
||||
if (next_hop != NULL
|
||||
#ifdef INET6
|
||||
&& isipv6 == NULL /* IPv6 support is not yet */
|
||||
#endif /* INET6 */
|
||||
) {
|
||||
if (next_hop != NULL && isipv6 == 0) { /* IPv6 support is not yet */
|
||||
/*
|
||||
* Transparently forwarded. Pretend to be the destination.
|
||||
* already got one like this?
|
||||
*/
|
||||
inp = in_pcblookup_hash(&tcbinfo, ip->ip_src, th->th_sport,
|
||||
ip->ip_dst, th->th_dport, 0, m->m_pkthdr.rcvif);
|
||||
ip->ip_dst, th->th_dport,
|
||||
0, m->m_pkthdr.rcvif);
|
||||
if (!inp) {
|
||||
/*
|
||||
* No, then it's new. Try find the ambushing socket
|
||||
*/
|
||||
if (next_hop->sin_port == 0) {
|
||||
inp = in_pcblookup_hash(&tcbinfo, ip->ip_src,
|
||||
th->th_sport, next_hop->sin_addr,
|
||||
th->th_dport, 1, m->m_pkthdr.rcvif);
|
||||
} else {
|
||||
inp = in_pcblookup_hash(&tcbinfo,
|
||||
ip->ip_src, th->th_sport,
|
||||
next_hop->sin_addr,
|
||||
ntohs(next_hop->sin_port), 1,
|
||||
m->m_pkthdr.rcvif);
|
||||
}
|
||||
/* It's new. Try find the ambushing socket. */
|
||||
inp = in_pcblookup_hash(&tcbinfo,
|
||||
ip->ip_src, th->th_sport,
|
||||
next_hop->sin_addr,
|
||||
next_hop->sin_port ?
|
||||
ntohs(next_hop->sin_port) :
|
||||
th->th_dport,
|
||||
1, m->m_pkthdr.rcvif);
|
||||
}
|
||||
} else
|
||||
{
|
||||
#ifdef INET6
|
||||
if (isipv6)
|
||||
inp = in6_pcblookup_hash(&tcbinfo, &ip6->ip6_src, th->th_sport,
|
||||
&ip6->ip6_dst, th->th_dport, 1,
|
||||
m->m_pkthdr.rcvif);
|
||||
else
|
||||
#endif /* INET6 */
|
||||
inp = in_pcblookup_hash(&tcbinfo, ip->ip_src, th->th_sport,
|
||||
ip->ip_dst, th->th_dport, 1, m->m_pkthdr.rcvif);
|
||||
} else {
|
||||
if (isipv6)
|
||||
inp = in6_pcblookup_hash(&tcbinfo,
|
||||
&ip6->ip6_src, th->th_sport,
|
||||
&ip6->ip6_dst, th->th_dport,
|
||||
1, m->m_pkthdr.rcvif);
|
||||
else
|
||||
inp = in_pcblookup_hash(&tcbinfo,
|
||||
ip->ip_src, th->th_sport,
|
||||
ip->ip_dst, th->th_dport,
|
||||
1, m->m_pkthdr.rcvif);
|
||||
}
|
||||
|
||||
#ifdef IPSEC
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
if (inp != NULL && ipsec6_in_reject_so(m, inp->inp_socket)) {
|
||||
ipsec6stat.in_polvio++;
|
||||
goto drop;
|
||||
}
|
||||
} else
|
||||
#endif /* INET6 */
|
||||
if (inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) {
|
||||
ipsecstat.in_polvio++;
|
||||
goto drop;
|
||||
} else {
|
||||
if (inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) {
|
||||
ipsecstat.in_polvio++;
|
||||
goto drop;
|
||||
}
|
||||
}
|
||||
#endif /*IPSEC*/
|
||||
#endif
|
||||
|
||||
/*
|
||||
* If the state is CLOSED (i.e., TCB does not exist) then
|
||||
@ -591,34 +577,32 @@ tcp_input(m, off0)
|
||||
if (log_in_vain) {
|
||||
#ifdef INET6
|
||||
char dbuf[INET6_ADDRSTRLEN], sbuf[INET6_ADDRSTRLEN];
|
||||
#else /* INET6 */
|
||||
#else
|
||||
char dbuf[4*sizeof "123"], sbuf[4*sizeof "123"];
|
||||
#endif /* INET6 */
|
||||
#endif
|
||||
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
strcpy(dbuf, ip6_sprintf(&ip6->ip6_dst));
|
||||
strcpy(sbuf, ip6_sprintf(&ip6->ip6_src));
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
strcpy(dbuf, inet_ntoa(ip->ip_dst));
|
||||
strcpy(sbuf, inet_ntoa(ip->ip_src));
|
||||
}
|
||||
} else {
|
||||
strcpy(dbuf, inet_ntoa(ip->ip_dst));
|
||||
strcpy(sbuf, inet_ntoa(ip->ip_src));
|
||||
}
|
||||
switch (log_in_vain) {
|
||||
case 1:
|
||||
if(thflags & TH_SYN)
|
||||
if (thflags & TH_SYN)
|
||||
log(LOG_INFO,
|
||||
"Connection attempt to TCP %s:%d from %s:%d\n",
|
||||
dbuf, ntohs(th->th_dport),
|
||||
sbuf,
|
||||
ntohs(th->th_sport));
|
||||
"Connection attempt to TCP %s:%d "
|
||||
"from %s:%d\n",
|
||||
dbuf, ntohs(th->th_dport), sbuf,
|
||||
ntohs(th->th_sport));
|
||||
break;
|
||||
case 2:
|
||||
log(LOG_INFO,
|
||||
"Connection attempt to TCP %s:%d from %s:%d flags:0x%x\n",
|
||||
dbuf, ntohs(th->th_dport), sbuf,
|
||||
ntohs(th->th_sport), thflags);
|
||||
"Connection attempt to TCP %s:%d "
|
||||
"from %s:%d flags:0x%x\n",
|
||||
dbuf, ntohs(th->th_dport), sbuf,
|
||||
ntohs(th->th_sport), thflags);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
@ -666,13 +650,12 @@ tcp_input(m, off0)
|
||||
#ifdef TCPDEBUG
|
||||
if (so->so_options & SO_DEBUG) {
|
||||
ostate = tp->t_state;
|
||||
#ifdef INET6
|
||||
if (isipv6)
|
||||
bcopy((char *)ip6, (char *)tcp_saveipgen,
|
||||
sizeof(*ip6));
|
||||
sizeof(*ip6));
|
||||
else
|
||||
#endif /* INET6 */
|
||||
bcopy((char *)ip, (char *)tcp_saveipgen, sizeof(*ip));
|
||||
bcopy((char *)ip, (char *)tcp_saveipgen,
|
||||
sizeof(*ip));
|
||||
tcp_savetcp = *th;
|
||||
}
|
||||
#endif
|
||||
@ -681,14 +664,12 @@ tcp_input(m, off0)
|
||||
goto after_listen;
|
||||
#ifdef INET6
|
||||
inc.inc_isipv6 = isipv6;
|
||||
#endif
|
||||
if (isipv6) {
|
||||
inc.inc6_faddr = ip6->ip6_src;
|
||||
inc.inc6_laddr = ip6->ip6_dst;
|
||||
inc.inc6_route.ro_rt = NULL; /* XXX */
|
||||
|
||||
} else
|
||||
#endif /* INET6 */
|
||||
{
|
||||
} else {
|
||||
inc.inc_faddr = ip->ip_src;
|
||||
inc.inc_laddr = ip->ip_dst;
|
||||
inc.inc_route.ro_rt = NULL; /* XXX */
|
||||
@ -817,15 +798,14 @@ tcp_input(m, off0)
|
||||
* Don't bother responding if the destination was a broadcast.
|
||||
*/
|
||||
if (th->th_dport == th->th_sport) {
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
|
||||
&ip6->ip6_src))
|
||||
goto drop;
|
||||
} else
|
||||
#endif /* INET6 */
|
||||
if (ip->ip_dst.s_addr == ip->ip_src.s_addr)
|
||||
goto drop;
|
||||
} else {
|
||||
if (ip->ip_dst.s_addr == ip->ip_src.s_addr)
|
||||
goto drop;
|
||||
}
|
||||
}
|
||||
/*
|
||||
* RFC1122 4.2.3.10, p. 104: discard bcast/mcast SYN
|
||||
@ -836,18 +816,17 @@ tcp_input(m, off0)
|
||||
*/
|
||||
if (m->m_flags & (M_BCAST|M_MCAST))
|
||||
goto drop;
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
|
||||
IN6_IS_ADDR_MULTICAST(&ip6->ip6_src))
|
||||
goto drop;
|
||||
} else
|
||||
#endif
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
} else {
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
}
|
||||
/*
|
||||
* SYN appears to be valid; create compressed TCP state
|
||||
* for syncache, or perform t/tcp connection.
|
||||
@ -884,20 +863,13 @@ tcp_input(m, off0)
|
||||
* segment. Otherwise must send ACK now in case
|
||||
* the other side is slow starting.
|
||||
*/
|
||||
if (DELAY_ACK(tp) && ((thflags & TH_FIN) ||
|
||||
(tlen != 0 &&
|
||||
#ifdef INET6
|
||||
((isipv6 && in6_localaddr(&inp->in6p_faddr))
|
||||
||
|
||||
(!isipv6 &&
|
||||
#endif
|
||||
in_localaddr(inp->inp_faddr)
|
||||
#ifdef INET6
|
||||
))
|
||||
#endif
|
||||
))) {
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
tcp_timer_delack, tp);
|
||||
if (DELAY_ACK(tp) &&
|
||||
((thflags & TH_FIN) ||
|
||||
(tlen != 0 &&
|
||||
((isipv6 && in6_localaddr(&inp->in6p_faddr)) ||
|
||||
(!isipv6 && in_localaddr(inp->inp_faddr)))))) {
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
tcp_timer_delack, tp);
|
||||
tp->t_flags |= TF_NEEDSYN;
|
||||
} else
|
||||
tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN);
|
||||
@ -984,7 +956,7 @@ tcp_input(m, off0)
|
||||
* proposal of the tcplw@cray.com list (Braden 1993/04/26).
|
||||
*/
|
||||
if ((to.to_flags & TOF_TS) != 0 &&
|
||||
SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
|
||||
SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
|
||||
tp->ts_recent_age = ticks;
|
||||
tp->ts_recent = to.to_tsval;
|
||||
}
|
||||
@ -1017,7 +989,8 @@ tcp_input(m, off0)
|
||||
ticks - to.to_tsecr + 1);
|
||||
else if (tp->t_rtttime &&
|
||||
SEQ_GT(th->th_ack, tp->t_rtseq))
|
||||
tcp_xmit_timer(tp, ticks - tp->t_rtttime);
|
||||
tcp_xmit_timer(tp,
|
||||
ticks - tp->t_rtttime);
|
||||
acked = th->th_ack - tp->snd_una;
|
||||
tcpstat.tcps_rcvackpack++;
|
||||
tcpstat.tcps_rcvackbyte += acked;
|
||||
@ -1223,15 +1196,16 @@ tcp_input(m, off0)
|
||||
tcp_timer_keep, tp);
|
||||
}
|
||||
} else {
|
||||
/*
|
||||
* Received initial SYN in SYN-SENT[*] state => simul-
|
||||
* taneous open. If segment contains CC option and there is
|
||||
* a cached CC, apply TAO test; if it succeeds, connection is
|
||||
* half-synchronized. Otherwise, do 3-way handshake:
|
||||
* SYN-SENT -> SYN-RECEIVED
|
||||
* SYN-SENT* -> SYN-RECEIVED*
|
||||
* If there was no CC option, clear cached CC value.
|
||||
*/
|
||||
/*
|
||||
* Received initial SYN in SYN-SENT[*] state =>
|
||||
* simultaneous open. If segment contains CC option
|
||||
* and there is a cached CC, apply TAO test.
|
||||
* If it succeeds, connection is * half-synchronized.
|
||||
* Otherwise, do 3-way handshake:
|
||||
* SYN-SENT -> SYN-RECEIVED
|
||||
* SYN-SENT* -> SYN-RECEIVED*
|
||||
* If there was no CC option, clear cached CC value.
|
||||
*/
|
||||
tp->t_flags |= TF_ACKNOW;
|
||||
callout_stop(tp->tt_rexmt);
|
||||
if (to.to_flags & TOF_CC) {
|
||||
@ -1282,15 +1256,17 @@ tcp_input(m, off0)
|
||||
tp->snd_wl1 = th->th_seq - 1;
|
||||
tp->rcv_up = th->th_seq;
|
||||
/*
|
||||
* Client side of transaction: already sent SYN and data.
|
||||
* If the remote host used T/TCP to validate the SYN,
|
||||
* our data will be ACK'd; if so, enter normal data segment
|
||||
* processing in the middle of step 5, ack processing.
|
||||
* Otherwise, goto step 6.
|
||||
* Client side of transaction: already sent SYN and data.
|
||||
* If the remote host used T/TCP to validate the SYN,
|
||||
* our data will be ACK'd; if so, enter normal data segment
|
||||
* processing in the middle of step 5, ack processing.
|
||||
* Otherwise, goto step 6.
|
||||
*/
|
||||
if (thflags & TH_ACK)
|
||||
goto process_ACK;
|
||||
|
||||
goto step6;
|
||||
|
||||
/*
|
||||
* If the state is LAST_ACK or CLOSING or TIME_WAIT:
|
||||
* if segment contains a SYN and CC [not CC.NEW] option:
|
||||
@ -1701,8 +1677,9 @@ tcp_input(m, off0)
|
||||
u_int win =
|
||||
min(tp->snd_wnd, tp->snd_cwnd) / 2 /
|
||||
tp->t_maxseg;
|
||||
if (tcp_do_newreno && SEQ_LT(th->th_ack,
|
||||
tp->snd_recover)) {
|
||||
if (tcp_do_newreno &&
|
||||
SEQ_LT(th->th_ack,
|
||||
tp->snd_recover)) {
|
||||
/* False retransmit, should not
|
||||
* cut window
|
||||
*/
|
||||
@ -1721,7 +1698,7 @@ tcp_input(m, off0)
|
||||
tp->snd_cwnd = tp->t_maxseg;
|
||||
(void) tcp_output(tp);
|
||||
tp->snd_cwnd = tp->snd_ssthresh +
|
||||
tp->t_maxseg * tp->t_dupacks;
|
||||
tp->t_maxseg * tp->t_dupacks;
|
||||
if (SEQ_GT(onxt, tp->snd_nxt))
|
||||
tp->snd_nxt = onxt;
|
||||
goto drop;
|
||||
@ -1738,34 +1715,48 @@ tcp_input(m, off0)
|
||||
* If the congestion window was inflated to account
|
||||
* for the other side's cached packets, retract it.
|
||||
*/
|
||||
if (tcp_do_newreno == 0) {
|
||||
if (tcp_do_newreno) {
|
||||
int is_partialack = SEQ_LT(th->th_ack, tp->snd_recover);
|
||||
if (tp->t_dupacks >= tcprexmtthresh) {
|
||||
if (is_partialack) {
|
||||
tcp_newreno_partial_ack(tp, th);
|
||||
} else {
|
||||
/*
|
||||
* Window inflation should have left us
|
||||
* with approximately snd_ssthresh
|
||||
* outstanding data.
|
||||
* But in case we would be inclined to
|
||||
* send a burst, better to do it via
|
||||
* the slow start mechanism.
|
||||
*/
|
||||
if (SEQ_GT(th->th_ack +
|
||||
tp->snd_ssthresh,
|
||||
tp->snd_max))
|
||||
tp->snd_cwnd = tp->snd_max -
|
||||
th->th_ack +
|
||||
tp->t_maxseg;
|
||||
else
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
}
|
||||
}
|
||||
/*
|
||||
* Reset dupacks, except on partial acks in
|
||||
* fast recovery.
|
||||
*/
|
||||
if (!(tp->t_dupacks >= tcprexmtthresh && is_partialack))
|
||||
tp->t_dupacks = 0;
|
||||
} else {
|
||||
if (tp->t_dupacks >= tcprexmtthresh &&
|
||||
tp->snd_cwnd > tp->snd_ssthresh)
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
tp->t_dupacks = 0;
|
||||
} else if (tp->t_dupacks >= tcprexmtthresh &&
|
||||
!tcp_newreno(tp, th)) {
|
||||
/*
|
||||
* Window inflation should have left us with approx.
|
||||
* snd_ssthresh outstanding data. But in case we
|
||||
* would be inclined to send a burst, better to do
|
||||
* it via the slow start mechanism.
|
||||
*/
|
||||
if (SEQ_GT(th->th_ack + tp->snd_ssthresh, tp->snd_max))
|
||||
tp->snd_cwnd =
|
||||
tp->snd_max - th->th_ack + tp->t_maxseg;
|
||||
else
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
tp->t_dupacks = 0;
|
||||
}
|
||||
if (tp->t_dupacks < tcprexmtthresh)
|
||||
tp->snd_cwnd > tp->snd_ssthresh)
|
||||
tp->snd_cwnd = tp->snd_ssthresh;
|
||||
tp->t_dupacks = 0;
|
||||
}
|
||||
if (SEQ_GT(th->th_ack, tp->snd_max)) {
|
||||
tcpstat.tcps_rcvacktoomuch++;
|
||||
goto dropafterack;
|
||||
}
|
||||
/*
|
||||
* If we reach this point, ACK is not a duplicate,
|
||||
* If we reach this point, ACK is not a duplicate,
|
||||
* i.e., it ACKs something we sent.
|
||||
*/
|
||||
if (tp->t_flags & TF_NEEDSYN) {
|
||||
@ -1858,7 +1849,7 @@ tcp_input(m, off0)
|
||||
* in NewReno fast recovery mode, so we leave the congestion
|
||||
* window alone.
|
||||
*/
|
||||
if (tcp_do_newreno == 0 || tp->t_dupacks == 0)
|
||||
if (!tcp_do_newreno || tp->t_dupacks == 0)
|
||||
tp->snd_cwnd = min(cw + incr,TCP_MAXWIN<<tp->snd_scale);
|
||||
}
|
||||
if (acked > so->so_snd.sb_cc) {
|
||||
@ -2022,7 +2013,7 @@ tcp_input(m, off0)
|
||||
)
|
||||
tcp_pulloutofband(so, th, m,
|
||||
drop_hdrlen); /* hdr drop is delayed */
|
||||
} else
|
||||
} else {
|
||||
/*
|
||||
* If no out of band data is expected,
|
||||
* pull receive urgent pointer along
|
||||
@ -2030,6 +2021,7 @@ tcp_input(m, off0)
|
||||
*/
|
||||
if (SEQ_GT(tp->rcv_nxt, tp->rcv_up))
|
||||
tp->rcv_up = tp->rcv_nxt;
|
||||
}
|
||||
dodata: /* XXX */
|
||||
KASSERT(headlocked, ("headlocked"));
|
||||
INP_INFO_WUNLOCK(&tcbinfo);
|
||||
@ -2042,25 +2034,27 @@ tcp_input(m, off0)
|
||||
* case PRU_RCVD). If a FIN has already been received on this
|
||||
* connection then we just ignore the text.
|
||||
*/
|
||||
if ((tlen || (thflags&TH_FIN)) &&
|
||||
if ((tlen || (thflags & TH_FIN)) &&
|
||||
TCPS_HAVERCVDFIN(tp->t_state) == 0) {
|
||||
m_adj(m, drop_hdrlen); /* delayed header drop */
|
||||
/*
|
||||
* Insert segment which inludes th into reassembly queue of tcp with
|
||||
* control block tp. Return TH_FIN if reassembly now includes
|
||||
* a segment with FIN. This handle the common case inline (segment
|
||||
* is the next to be received on an established connection, and the
|
||||
* queue is empty), avoiding linkage into and removal from the queue
|
||||
* and repetition of various conversions.
|
||||
* Set DELACK for segments received in order, but ack immediately
|
||||
* when segments are out of order (so fast retransmit can work).
|
||||
* Insert segment which includes th into TCP reassembly queue
|
||||
* with control block tp. Set thflags to whether reassembly now
|
||||
* includes a segment with FIN. This handles the common case
|
||||
* inline (segment is the next to be received on an established
|
||||
* connection, and the queue is empty), avoiding linkage into
|
||||
* and removal from the queue and repetition of various
|
||||
* conversions.
|
||||
* Set DELACK for segments received in order, but ack
|
||||
* immediately when segments are out of order (so
|
||||
* fast retransmit can work).
|
||||
*/
|
||||
if (th->th_seq == tp->rcv_nxt &&
|
||||
LIST_EMPTY(&tp->t_segq) &&
|
||||
TCPS_HAVEESTABLISHED(tp->t_state)) {
|
||||
if (DELAY_ACK(tp))
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
tcp_timer_delack, tp);
|
||||
tcp_timer_delack, tp);
|
||||
else
|
||||
tp->t_flags |= TF_ACKNOW;
|
||||
tp->rcv_nxt += tlen;
|
||||
@ -2094,11 +2088,11 @@ tcp_input(m, off0)
|
||||
if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
|
||||
socantrcvmore(so);
|
||||
/*
|
||||
* If connection is half-synchronized
|
||||
* (ie NEEDSYN flag on) then delay ACK,
|
||||
* so it may be piggybacked when SYN is sent.
|
||||
* Otherwise, since we received a FIN then no
|
||||
* more input can be expected, send ACK now.
|
||||
* If connection is half-synchronized
|
||||
* (ie NEEDSYN flag on) then delay ACK,
|
||||
* so it may be piggybacked when SYN is sent.
|
||||
* Otherwise, since we received a FIN then no
|
||||
* more input can be expected, send ACK now.
|
||||
*/
|
||||
if (DELAY_ACK(tp) && (tp->t_flags & TF_NEEDSYN))
|
||||
callout_reset(tp->tt_delack, tcp_delacktime,
|
||||
@ -2217,18 +2211,17 @@ tcp_input(m, off0)
|
||||
*/
|
||||
if ((thflags & TH_RST) || m->m_flags & (M_BCAST|M_MCAST))
|
||||
goto drop;
|
||||
#ifdef INET6
|
||||
if (isipv6) {
|
||||
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
|
||||
IN6_IS_ADDR_MULTICAST(&ip6->ip6_src))
|
||||
goto drop;
|
||||
} else
|
||||
#endif /* INET6 */
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
} else {
|
||||
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
||||
IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
|
||||
ip->ip_src.s_addr == htonl(INADDR_BROADCAST) ||
|
||||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))
|
||||
goto drop;
|
||||
}
|
||||
/* IPv6 anycast check is done at tcp6_input() */
|
||||
|
||||
/*
|
||||
@ -2518,35 +2511,27 @@ tcp_mss(tp, offer)
|
||||
struct ifnet *ifp;
|
||||
register int rtt, mss;
|
||||
u_long bufsize;
|
||||
struct inpcb *inp;
|
||||
struct inpcb *inp = tp->t_inpcb;
|
||||
struct socket *so;
|
||||
struct rmxp_tao *taop;
|
||||
int origoffer = offer;
|
||||
#ifdef INET6
|
||||
int isipv6;
|
||||
int min_protoh;
|
||||
int isipv6 = ((inp->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
size_t min_protoh = isipv6 ?
|
||||
sizeof (struct ip6_hdr) + sizeof (struct tcphdr) :
|
||||
sizeof (struct tcpiphdr);
|
||||
#else
|
||||
const int isipv6 = 0;
|
||||
const size_t min_protoh = sizeof (struct tcpiphdr);
|
||||
#endif
|
||||
|
||||
inp = tp->t_inpcb;
|
||||
#ifdef INET6
|
||||
isipv6 = ((inp->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
min_protoh = isipv6 ? sizeof (struct ip6_hdr) + sizeof (struct tcphdr)
|
||||
: sizeof (struct tcpiphdr);
|
||||
#else
|
||||
#define min_protoh (sizeof (struct tcpiphdr))
|
||||
#endif
|
||||
#ifdef INET6
|
||||
if (isipv6)
|
||||
rt = tcp_rtlookup6(&inp->inp_inc);
|
||||
else
|
||||
#endif
|
||||
rt = tcp_rtlookup(&inp->inp_inc);
|
||||
rt = tcp_rtlookup(&inp->inp_inc);
|
||||
if (rt == NULL) {
|
||||
tp->t_maxopd = tp->t_maxseg =
|
||||
#ifdef INET6
|
||||
isipv6 ? tcp_v6mssdflt :
|
||||
#endif /* INET6 */
|
||||
tcp_mssdflt;
|
||||
isipv6 ? tcp_v6mssdflt : tcp_mssdflt;
|
||||
return;
|
||||
}
|
||||
ifp = rt->rt_ifp;
|
||||
@ -2564,11 +2549,7 @@ tcp_mss(tp, offer)
|
||||
* in this case we use tcp_mssdflt.
|
||||
*/
|
||||
if (offer == 0)
|
||||
offer =
|
||||
#ifdef INET6
|
||||
isipv6 ? tcp_v6mssdflt :
|
||||
#endif /* INET6 */
|
||||
tcp_mssdflt;
|
||||
offer = isipv6 ? tcp_v6mssdflt : tcp_mssdflt;
|
||||
else
|
||||
/*
|
||||
* Sanity check: make sure that maxopd will be large
|
||||
@ -2612,25 +2593,17 @@ tcp_mss(tp, offer)
|
||||
*/
|
||||
if (rt->rt_rmx.rmx_mtu)
|
||||
mss = rt->rt_rmx.rmx_mtu - min_protoh;
|
||||
else
|
||||
{
|
||||
mss =
|
||||
#ifdef INET6
|
||||
(isipv6 ? nd_ifinfo[rt->rt_ifp->if_index].linkmtu :
|
||||
#endif
|
||||
ifp->if_mtu
|
||||
#ifdef INET6
|
||||
)
|
||||
#endif
|
||||
- min_protoh;
|
||||
#ifdef INET6
|
||||
else {
|
||||
if (isipv6) {
|
||||
mss = nd_ifinfo[rt->rt_ifp->if_index].linkmtu -
|
||||
min_protoh;
|
||||
if (!in6_localaddr(&inp->in6p_faddr))
|
||||
mss = min(mss, tcp_v6mssdflt);
|
||||
} else
|
||||
#endif
|
||||
if (!in_localaddr(inp->inp_faddr))
|
||||
mss = min(mss, tcp_mssdflt);
|
||||
} else {
|
||||
mss = ifp->if_mtu - min_protoh;
|
||||
if (!in_localaddr(inp->inp_faddr))
|
||||
mss = min(mss, tcp_mssdflt);
|
||||
}
|
||||
}
|
||||
mss = min(mss, offer);
|
||||
/*
|
||||
@ -2700,16 +2673,8 @@ tcp_mss(tp, offer)
|
||||
* Set the slow-start flight size depending on whether this
|
||||
* is a local network or not.
|
||||
*/
|
||||
if (
|
||||
#ifdef INET6
|
||||
(isipv6 && in6_localaddr(&inp->in6p_faddr)) ||
|
||||
(!isipv6 &&
|
||||
#endif
|
||||
in_localaddr(inp->inp_faddr)
|
||||
#ifdef INET6
|
||||
)
|
||||
#endif
|
||||
)
|
||||
if ((isipv6 && in6_localaddr(&inp->in6p_faddr)) ||
|
||||
(!isipv6 && in_localaddr(inp->inp_faddr)))
|
||||
tp->snd_cwnd = mss * ss_fltsz_local;
|
||||
else
|
||||
tp->snd_cwnd = mss * ss_fltsz;
|
||||
@ -2735,68 +2700,55 @@ tcp_mssopt(tp)
|
||||
{
|
||||
struct rtentry *rt;
|
||||
#ifdef INET6
|
||||
int isipv6;
|
||||
int min_protoh;
|
||||
int isipv6 = ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
size_t min_protoh = isipv6 ?
|
||||
sizeof (struct ip6_hdr) + sizeof (struct tcphdr) :
|
||||
sizeof (struct tcpiphdr);
|
||||
#else
|
||||
const int isipv6 = 0;
|
||||
const size_t min_protoh = sizeof (struct tcpiphdr);
|
||||
#endif
|
||||
|
||||
#ifdef INET6
|
||||
isipv6 = ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) ? 1 : 0;
|
||||
min_protoh = isipv6 ? sizeof (struct ip6_hdr) + sizeof (struct tcphdr)
|
||||
: sizeof (struct tcpiphdr);
|
||||
#else
|
||||
#define min_protoh (sizeof (struct tcpiphdr))
|
||||
#endif
|
||||
#ifdef INET6
|
||||
if (isipv6)
|
||||
rt = tcp_rtlookup6(&tp->t_inpcb->inp_inc);
|
||||
else
|
||||
#endif /* INET6 */
|
||||
rt = tcp_rtlookup(&tp->t_inpcb->inp_inc);
|
||||
rt = tcp_rtlookup(&tp->t_inpcb->inp_inc);
|
||||
if (rt == NULL)
|
||||
return
|
||||
#ifdef INET6
|
||||
isipv6 ? tcp_v6mssdflt :
|
||||
#endif /* INET6 */
|
||||
tcp_mssdflt;
|
||||
return (isipv6 ? tcp_v6mssdflt : tcp_mssdflt);
|
||||
|
||||
return rt->rt_ifp->if_mtu - min_protoh;
|
||||
return (rt->rt_ifp->if_mtu - min_protoh);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Checks for partial ack. If partial ack arrives, force the retransmission
|
||||
* of the next unacknowledged segment, do not clear tp->t_dupacks, and return
|
||||
* 1. By setting snd_nxt to ti_ack, this forces retransmission timer to
|
||||
* be started again. If the ack advances at least to tp->snd_recover, return 0.
|
||||
* On a partial ack arrives, force the retransmission of the
|
||||
* next unacknowledged segment. Do not clear tp->t_dupacks.
|
||||
* By setting snd_nxt to ti_ack, this forces retransmission timer to
|
||||
* be started again.
|
||||
*/
|
||||
static int
|
||||
tcp_newreno(tp, th)
|
||||
static void
|
||||
tcp_newreno_partial_ack(tp, th)
|
||||
struct tcpcb *tp;
|
||||
struct tcphdr *th;
|
||||
{
|
||||
if (SEQ_LT(th->th_ack, tp->snd_recover)) {
|
||||
tcp_seq onxt = tp->snd_nxt;
|
||||
u_long ocwnd = tp->snd_cwnd;
|
||||
tcp_seq onxt = tp->snd_nxt;
|
||||
u_long ocwnd = tp->snd_cwnd;
|
||||
|
||||
callout_stop(tp->tt_rexmt);
|
||||
tp->t_rtttime = 0;
|
||||
tp->snd_nxt = th->th_ack;
|
||||
/*
|
||||
* Set snd_cwnd to one segment beyond acknowledged offset
|
||||
* (tp->snd_una has not yet been updated when this function
|
||||
* is called)
|
||||
*/
|
||||
tp->snd_cwnd = tp->t_maxseg + (th->th_ack - tp->snd_una);
|
||||
(void) tcp_output(tp);
|
||||
tp->snd_cwnd = ocwnd;
|
||||
if (SEQ_GT(onxt, tp->snd_nxt))
|
||||
tp->snd_nxt = onxt;
|
||||
/*
|
||||
* Partial window deflation. Relies on fact that tp->snd_una
|
||||
* not updated yet.
|
||||
*/
|
||||
tp->snd_cwnd -= (th->th_ack - tp->snd_una - tp->t_maxseg);
|
||||
return (1);
|
||||
}
|
||||
return (0);
|
||||
callout_stop(tp->tt_rexmt);
|
||||
tp->t_rtttime = 0;
|
||||
tp->snd_nxt = th->th_ack;
|
||||
/*
|
||||
* Set snd_cwnd to one segment beyond acknowledged offset.
|
||||
* (tp->snd_una has not yet been updated when this function is called.)
|
||||
*/
|
||||
tp->snd_cwnd = tp->t_maxseg + (th->th_ack - tp->snd_una);
|
||||
(void) tcp_output(tp);
|
||||
tp->snd_cwnd = ocwnd;
|
||||
if (SEQ_GT(onxt, tp->snd_nxt))
|
||||
tp->snd_nxt = onxt;
|
||||
/*
|
||||
* Partial window deflation. Relies on fact that tp->snd_una
|
||||
* not updated yet.
|
||||
*/
|
||||
tp->snd_cwnd -= (th->th_ack - tp->snd_una - tp->t_maxseg);
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user