tcp_timewait.c revision 78064
122514Sdarrenr/* 231183Speter * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 322514Sdarrenr * The Regents of the University of California. All rights reserved. 431183Speter * 531183Speter * Redistribution and use in source and binary forms, with or without 631183Speter * modification, are permitted provided that the following conditions 722514Sdarrenr * are met: 831183Speter * 1. Redistributions of source code must retain the above copyright 931183Speter * notice, this list of conditions and the following disclaimer. 1037074Speter * 2. Redistributions in binary form must reproduce the above copyright 1122514Sdarrenr * notice, this list of conditions and the following disclaimer in the 1222514Sdarrenr * documentation and/or other materials provided with the distribution. 1322514Sdarrenr * 3. All advertising materials mentioning features or use of this software 1422514Sdarrenr * must display the following acknowledgement: 1522514Sdarrenr * This product includes software developed by the University of 1622514Sdarrenr * California, Berkeley and its contributors. 1722514Sdarrenr * 4. Neither the name of the University nor the names of its contributors 1822514Sdarrenr * may be used to endorse or promote products derived from this software 1931183Speter * without specific prior written permission. 2022514Sdarrenr * 2122514Sdarrenr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2222514Sdarrenr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2322514Sdarrenr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2422514Sdarrenr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2522514Sdarrenr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2622514Sdarrenr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2722514Sdarrenr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2822514Sdarrenr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2931183Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3031183Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3131183Speter * SUCH DAMAGE. 3231183Speter * 3331183Speter * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95 3431183Speter * $FreeBSD: head/sys/netinet/tcp_timewait.c 78064 2001-06-11 12:39:29Z ume $ 3526119Sdarrenr */ 3626119Sdarrenr 3726119Sdarrenr#include "opt_compat.h" 3822514Sdarrenr#include "opt_inet6.h" 3922514Sdarrenr#include "opt_ipsec.h" 4022514Sdarrenr#include "opt_tcpdebug.h" 4122514Sdarrenr 4222514Sdarrenr#include <sys/param.h> 4322514Sdarrenr#include <sys/systm.h> 4431183Speter#include <sys/callout.h> 4531183Speter#include <sys/kernel.h> 4631183Speter#include <sys/sysctl.h> 4722514Sdarrenr#include <sys/malloc.h> 4822514Sdarrenr#include <sys/mbuf.h> 4922514Sdarrenr#ifdef INET6 5022514Sdarrenr#include <sys/domain.h> 5131183Speter#endif 5231183Speter#include <sys/proc.h> 5331183Speter#include <sys/socket.h> 5431183Speter#include <sys/socketvar.h> 5531183Speter#include <sys/protosw.h> 5631183Speter#include <sys/random.h> 5731183Speter 5831183Speter#include <vm/vm_zone.h> 5931183Speter 6022514Sdarrenr#include <net/route.h> 6122514Sdarrenr#include <net/if.h> 6222514Sdarrenr 6322514Sdarrenr#define _IP_VHL 6422514Sdarrenr#include <netinet/in.h> 6522514Sdarrenr#include <netinet/in_systm.h> 6631183Speter#include <netinet/ip.h> 6731183Speter#ifdef INET6 6831183Speter#include <netinet/ip6.h> 6931183Speter#endif 7031183Speter#include <netinet/in_pcb.h> 7131183Speter#ifdef INET6 7231183Speter#include <netinet6/in6_pcb.h> 7331183Speter#endif 7431183Speter#include <netinet/in_var.h> 7524583Sdarrenr#include <netinet/ip_var.h> 7622514Sdarrenr#ifdef INET6 7724583Sdarrenr#include <netinet6/ip6_var.h> 7822514Sdarrenr#endif 7922514Sdarrenr#include <netinet/tcp.h> 8022514Sdarrenr#include <netinet/tcp_fsm.h> 8122514Sdarrenr#include <netinet/tcp_seq.h> 8222514Sdarrenr#include <netinet/tcp_timer.h> 8322514Sdarrenr#include <netinet/tcp_var.h> 8422514Sdarrenr#ifdef INET6 8522514Sdarrenr#include <netinet6/tcp6_var.h> 8622514Sdarrenr#endif 8722514Sdarrenr#include <netinet/tcpip.h> 8822514Sdarrenr#ifdef TCPDEBUG 8922514Sdarrenr#include <netinet/tcp_debug.h> 9022514Sdarrenr#endif 9131183Speter#include <netinet6/ip6protosw.h> 9222514Sdarrenr 9322514Sdarrenr#ifdef IPSEC 9422514Sdarrenr#include <netinet6/ipsec.h> 9522514Sdarrenr#ifdef INET6 9622514Sdarrenr#include <netinet6/ipsec6.h> 9722514Sdarrenr#endif 9822514Sdarrenr#endif /*IPSEC*/ 9922514Sdarrenr 10022514Sdarrenr#include <machine/in_cksum.h> 10137074Speter 10237074Speterint tcp_mssdflt = TCP_MSS; 10322514SdarrenrSYSCTL_INT(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt, CTLFLAG_RW, 10437074Speter &tcp_mssdflt , 0, "Default TCP Maximum Segment Size"); 10537074Speter 10622514Sdarrenr#ifdef INET6 10722514Sdarrenrint tcp_v6mssdflt = TCP6_MSS; 10822514SdarrenrSYSCTL_INT(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt, 10922514Sdarrenr CTLFLAG_RW, &tcp_v6mssdflt , 0, 11022514Sdarrenr "Default TCP Maximum Segment Size for IPv6"); 11122514Sdarrenr#endif 11222514Sdarrenr 11322514Sdarrenr#if 0 11422514Sdarrenrstatic int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ; 11537074SpeterSYSCTL_INT(_net_inet_tcp, TCPCTL_RTTDFLT, rttdflt, CTLFLAG_RW, 11622514Sdarrenr &tcp_rttdflt , 0, "Default maximum TCP Round Trip Time"); 11722514Sdarrenr#endif 11822514Sdarrenr 11922514Sdarrenrstatic int tcp_do_rfc1323 = 1; 12022514SdarrenrSYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_RW, 12122514Sdarrenr &tcp_do_rfc1323 , 0, "Enable rfc1323 (high performance TCP) extensions"); 12222514Sdarrenr 12322514Sdarrenrstatic int tcp_do_rfc1644 = 0; 12422514SdarrenrSYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1644, rfc1644, CTLFLAG_RW, 12522514Sdarrenr &tcp_do_rfc1644 , 0, "Enable rfc1644 (TTCP) extensions"); 12622514Sdarrenr 12722514Sdarrenrstatic int tcp_tcbhashsize = 0; 12822514SdarrenrSYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD, 12922514Sdarrenr &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable"); 13022514Sdarrenr 13137074Speterstatic int do_tcpdrain = 1; 13222514SdarrenrSYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0, 13322514Sdarrenr "Enable tcp_drain routine for extra help when low on mbufs"); 13422514Sdarrenr 13522514SdarrenrSYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD, 13622514Sdarrenr &tcbinfo.ipi_count, 0, "Number of active PCBs"); 13722514Sdarrenr 13822514Sdarrenrstatic int icmp_may_rst = 1; 13922514SdarrenrSYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_RW, &icmp_may_rst, 0, 14022514Sdarrenr "Certain ICMP unreachable messages may abort connections in SYN_SENT"); 14122514Sdarrenr 14222514Sdarrenrstatic void tcp_cleartaocache __P((void)); 14322514Sdarrenrstatic void tcp_notify __P((struct inpcb *, int)); 14422514Sdarrenr 14522514Sdarrenr/* 14622514Sdarrenr * Target size of TCP PCB hash tables. Must be a power of two. 14722514Sdarrenr * 14822514Sdarrenr * Note that this can be overridden by the kernel environment 14922514Sdarrenr * variable net.inet.tcp.tcbhashsize 15022514Sdarrenr */ 15122514Sdarrenr#ifndef TCBHASHSIZE 15222514Sdarrenr#define TCBHASHSIZE 512 15322514Sdarrenr#endif 15422514Sdarrenr 15522514Sdarrenr/* 15622514Sdarrenr * This is the actual shape of what we allocate using the zone 15722514Sdarrenr * allocator. Doing it this way allows us to protect both structures 15822514Sdarrenr * using the same generation count, and also eliminates the overhead 15922514Sdarrenr * of allocating tcpcbs separately. By hiding the structure here, 16022514Sdarrenr * we avoid changing most of the rest of the code (although it needs 16122514Sdarrenr * to be changed, eventually, for greater efficiency). 16222514Sdarrenr */ 16322514Sdarrenr#define ALIGNMENT 32 16422514Sdarrenr#define ALIGNM1 (ALIGNMENT - 1) 16522514Sdarrenrstruct inp_tp { 16622514Sdarrenr union { 16722514Sdarrenr struct inpcb inp; 16822514Sdarrenr char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1]; 16922514Sdarrenr } inp_tp_u; 17022514Sdarrenr struct tcpcb tcb; 17122514Sdarrenr struct callout inp_tp_rexmt, inp_tp_persist, inp_tp_keep, inp_tp_2msl; 17222514Sdarrenr struct callout inp_tp_delack; 17322514Sdarrenr}; 17422514Sdarrenr#undef ALIGNMENT 17522514Sdarrenr#undef ALIGNM1 17622514Sdarrenr 17722514Sdarrenr/* 17822514Sdarrenr * Tcp initialization 17922514Sdarrenr */ 18022514Sdarrenrvoid 18122514Sdarrenrtcp_init() 18237074Speter{ 18322514Sdarrenr int hashsize = TCBHASHSIZE; 18422514Sdarrenr 18524583Sdarrenr tcp_ccgen = 1; 18624583Sdarrenr tcp_cleartaocache(); 18722514Sdarrenr 18822514Sdarrenr tcp_delacktime = TCPTV_DELACK; 18922514Sdarrenr tcp_keepinit = TCPTV_KEEP_INIT; 19022514Sdarrenr tcp_keepidle = TCPTV_KEEP_IDLE; 19122514Sdarrenr tcp_keepintvl = TCPTV_KEEPINTVL; 19222514Sdarrenr tcp_maxpersistidle = TCPTV_KEEP_IDLE; 19322514Sdarrenr tcp_msl = TCPTV_MSL; 19422514Sdarrenr 19537074Speter LIST_INIT(&tcb); 19622514Sdarrenr tcbinfo.listhead = &tcb; 19724583Sdarrenr TUNABLE_INT_FETCH("net.inet.tcp.tcbhashsize", &hashsize); 19824583Sdarrenr if (!powerof2(hashsize)) { 19922514Sdarrenr printf("WARNING: TCB hash size not a power of 2\n"); 20022514Sdarrenr hashsize = 512; /* safe default */ 20122514Sdarrenr } 20222514Sdarrenr tcp_tcbhashsize = hashsize; 20322514Sdarrenr tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask); 20422514Sdarrenr tcbinfo.porthashbase = hashinit(hashsize, M_PCB, 20522514Sdarrenr &tcbinfo.porthashmask); 20622514Sdarrenr tcbinfo.ipi_zone = zinit("tcpcb", sizeof(struct inp_tp), maxsockets, 20722514Sdarrenr ZONE_INTERRUPT, 0); 20822514Sdarrenr#ifdef INET6 20922514Sdarrenr#define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr)) 21022514Sdarrenr#else /* INET6 */ 21122514Sdarrenr#define TCP_MINPROTOHDR (sizeof(struct tcpiphdr)) 21222514Sdarrenr#endif /* INET6 */ 21322514Sdarrenr if (max_protohdr < TCP_MINPROTOHDR) 21437074Speter max_protohdr = TCP_MINPROTOHDR; 21522514Sdarrenr if (max_linkhdr + TCP_MINPROTOHDR > MHLEN) 21624583Sdarrenr panic("tcp_init"); 21724583Sdarrenr#undef TCP_MINPROTOHDR 21822514Sdarrenr} 21922514Sdarrenr 22022514Sdarrenr/* 22122514Sdarrenr * Create template to be used to send tcp packets on a connection. 22222514Sdarrenr * Call after host entry created, allocates an mbuf and fills 22337074Speter * in a skeletal tcp/ip header, minimizing the amount of work 22422514Sdarrenr * necessary when the connection is used. 22522514Sdarrenr */ 22622514Sdarrenrstruct tcptemp * 22722514Sdarrenrtcp_template(tp) 22824583Sdarrenr struct tcpcb *tp; 22924583Sdarrenr{ 23022514Sdarrenr register struct inpcb *inp = tp->t_inpcb; 23122514Sdarrenr register struct mbuf *m; 23222514Sdarrenr register struct tcptemp *n; 23322514Sdarrenr 23422514Sdarrenr if ((n = tp->t_template) == 0) { 23522514Sdarrenr m = m_get(M_DONTWAIT, MT_HEADER); 23622514Sdarrenr if (m == NULL) 23722514Sdarrenr return (0); 23822514Sdarrenr m->m_len = sizeof (struct tcptemp); 23922514Sdarrenr n = mtod(m, struct tcptemp *); 24022514Sdarrenr } 24122514Sdarrenr#ifdef INET6 24222514Sdarrenr if ((inp->inp_vflag & INP_IPV6) != 0) { 24322514Sdarrenr register struct ip6_hdr *ip6; 24422514Sdarrenr 24522514Sdarrenr ip6 = (struct ip6_hdr *)n->tt_ipgen; 24622514Sdarrenr ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | 24722514Sdarrenr (inp->in6p_flowinfo & IPV6_FLOWINFO_MASK); 24822514Sdarrenr ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | 24922514Sdarrenr (IPV6_VERSION & IPV6_VERSION_MASK); 25022514Sdarrenr ip6->ip6_nxt = IPPROTO_TCP; 25122514Sdarrenr ip6->ip6_plen = sizeof(struct tcphdr); 25222514Sdarrenr ip6->ip6_src = inp->in6p_laddr; 25322514Sdarrenr ip6->ip6_dst = inp->in6p_faddr; 25422514Sdarrenr n->tt_t.th_sum = 0; 25522514Sdarrenr } else 25622514Sdarrenr#endif 25722514Sdarrenr { 25822514Sdarrenr struct ip *ip = (struct ip *)n->tt_ipgen; 25922514Sdarrenr 26022514Sdarrenr bzero(ip, sizeof(struct ip)); /* XXX overkill? */ 26122514Sdarrenr ip->ip_vhl = IP_VHL_BORING; 26222514Sdarrenr ip->ip_p = IPPROTO_TCP; 26322514Sdarrenr ip->ip_src = inp->inp_laddr; 26422514Sdarrenr ip->ip_dst = inp->inp_faddr; 26522514Sdarrenr n->tt_t.th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 26622514Sdarrenr htons(sizeof(struct tcphdr) + IPPROTO_TCP)); 26722514Sdarrenr } 26822514Sdarrenr n->tt_t.th_sport = inp->inp_lport; 26922514Sdarrenr n->tt_t.th_dport = inp->inp_fport; 27022514Sdarrenr n->tt_t.th_seq = 0; 27122514Sdarrenr n->tt_t.th_ack = 0; 27222514Sdarrenr n->tt_t.th_x2 = 0; 27322514Sdarrenr n->tt_t.th_off = 5; 27422514Sdarrenr n->tt_t.th_flags = 0; 27522514Sdarrenr n->tt_t.th_win = 0; 27622514Sdarrenr n->tt_t.th_urp = 0; 27722514Sdarrenr return (n); 27822514Sdarrenr} 27922514Sdarrenr 28022514Sdarrenr/* 28122514Sdarrenr * Send a single message to the TCP at address specified by 28222514Sdarrenr * the given TCP/IP header. If m == 0, then we make a copy 28322514Sdarrenr * of the tcpiphdr at ti and send directly to the addressed host. 28422514Sdarrenr * This is used to force keep alive messages out using the TCP 28522514Sdarrenr * template for a connection tp->t_template. If flags are given 28637074Speter * then we send a message back to the TCP which originated the 28722514Sdarrenr * segment ti, and discard the mbuf containing it and any other 28822514Sdarrenr * attached mbufs. 28922514Sdarrenr * 29022514Sdarrenr * In any case the ack and sequence number of the transmitted 29122514Sdarrenr * segment are as specified by the parameters. 29222514Sdarrenr * 29322514Sdarrenr * NOTE: If m != NULL, then ti must point to *inside* the mbuf. 29422514Sdarrenr */ 29522514Sdarrenrvoid 29622514Sdarrenrtcp_respond(tp, ipgen, th, m, ack, seq, flags) 29737074Speter struct tcpcb *tp; 29822514Sdarrenr void *ipgen; 29922514Sdarrenr register struct tcphdr *th; 30022514Sdarrenr register struct mbuf *m; 30122514Sdarrenr tcp_seq ack, seq; 30222514Sdarrenr int flags; 30322514Sdarrenr{ 30437074Speter register int tlen; 30522514Sdarrenr int win = 0; 30622514Sdarrenr struct route *ro = 0; 30722514Sdarrenr struct route sro; 30822514Sdarrenr struct ip *ip; 30922514Sdarrenr struct tcphdr *nth; 31022514Sdarrenr#ifdef INET6 31122514Sdarrenr struct route_in6 *ro6 = 0; 31222514Sdarrenr struct route_in6 sro6; 31322514Sdarrenr struct ip6_hdr *ip6; 31422514Sdarrenr int isipv6; 31522514Sdarrenr#endif /* INET6 */ 31622514Sdarrenr int ipflags = 0; 31737074Speter 31822514Sdarrenr#ifdef INET6 31922514Sdarrenr isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6; 32022514Sdarrenr ip6 = ipgen; 32122514Sdarrenr#endif /* INET6 */ 32222514Sdarrenr ip = ipgen; 32322514Sdarrenr 32422514Sdarrenr if (tp) { 32522514Sdarrenr if (!(flags & TH_RST)) { 32622514Sdarrenr win = sbspace(&tp->t_inpcb->inp_socket->so_rcv); 32722514Sdarrenr if (win > (long)TCP_MAXWIN << tp->rcv_scale) 32822514Sdarrenr win = (long)TCP_MAXWIN << tp->rcv_scale; 32922514Sdarrenr } 33022514Sdarrenr#ifdef INET6 33137074Speter if (isipv6) 33222514Sdarrenr ro6 = &tp->t_inpcb->in6p_route; 33322514Sdarrenr else 33422514Sdarrenr#endif /* INET6 */ 33522514Sdarrenr ro = &tp->t_inpcb->inp_route; 33622514Sdarrenr } else { 33722514Sdarrenr#ifdef INET6 33822514Sdarrenr if (isipv6) { 33922514Sdarrenr ro6 = &sro6; 34022514Sdarrenr bzero(ro6, sizeof *ro6); 34137074Speter } else 34222514Sdarrenr#endif /* INET6 */ 34322514Sdarrenr { 34422514Sdarrenr ro = &sro; 34522514Sdarrenr bzero(ro, sizeof *ro); 34622514Sdarrenr } 34722514Sdarrenr } 34822514Sdarrenr if (m == 0) { 34922514Sdarrenr m = m_gethdr(M_DONTWAIT, MT_HEADER); 35022514Sdarrenr if (m == NULL) 35122514Sdarrenr return; 35222514Sdarrenr tlen = 0; 35322514Sdarrenr m->m_data += max_linkhdr; 35422514Sdarrenr#ifdef INET6 35522514Sdarrenr if (isipv6) { 35622514Sdarrenr bcopy((caddr_t)ip6, mtod(m, caddr_t), 35737074Speter sizeof(struct ip6_hdr)); 35822514Sdarrenr ip6 = mtod(m, struct ip6_hdr *); 35922514Sdarrenr nth = (struct tcphdr *)(ip6 + 1); 36022514Sdarrenr } else 36122514Sdarrenr#endif /* INET6 */ 36222514Sdarrenr { 36322514Sdarrenr bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); 36422514Sdarrenr ip = mtod(m, struct ip *); 36522514Sdarrenr nth = (struct tcphdr *)(ip + 1); 36622514Sdarrenr } 36722514Sdarrenr bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr)); 36837074Speter flags = TH_ACK; 36922514Sdarrenr } else { 37022514Sdarrenr m_freem(m->m_next); 37122514Sdarrenr m->m_next = 0; 37222514Sdarrenr m->m_data = (caddr_t)ipgen; 37322514Sdarrenr /* m_len is set later */ 37422514Sdarrenr tlen = 0; 37537074Speter#define xchg(a,b,type) { type t; t=a; a=b; b=t; } 37622514Sdarrenr#ifdef INET6 37722514Sdarrenr if (isipv6) { 37822514Sdarrenr xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr); 37922514Sdarrenr nth = (struct tcphdr *)(ip6 + 1); 38022514Sdarrenr } else 38122514Sdarrenr#endif /* INET6 */ 38222514Sdarrenr { 38322514Sdarrenr xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, n_long); 38422514Sdarrenr nth = (struct tcphdr *)(ip + 1); 38522514Sdarrenr } 38622514Sdarrenr if (th != nth) { 38722514Sdarrenr /* 38822514Sdarrenr * this is usually a case when an extension header 38937074Speter * exists between the IPv6 header and the 39022514Sdarrenr * TCP header. 39122514Sdarrenr */ 39222514Sdarrenr nth->th_sport = th->th_sport; 39322514Sdarrenr nth->th_dport = th->th_dport; 39422514Sdarrenr } 39522514Sdarrenr xchg(nth->th_dport, nth->th_sport, n_short); 39622514Sdarrenr#undef xchg 39722514Sdarrenr } 39822514Sdarrenr#ifdef INET6 39922514Sdarrenr if (isipv6) { 40022514Sdarrenr ip6->ip6_plen = htons((u_short)(sizeof (struct tcphdr) + 40122514Sdarrenr tlen)); 40222514Sdarrenr tlen += sizeof (struct ip6_hdr) + sizeof (struct tcphdr); 40322514Sdarrenr } else 40422514Sdarrenr#endif 40522514Sdarrenr { 40622514Sdarrenr tlen += sizeof (struct tcpiphdr); 40722514Sdarrenr ip->ip_len = tlen; 40822514Sdarrenr ip->ip_ttl = ip_defttl; 40922514Sdarrenr } 41022514Sdarrenr m->m_len = tlen; 41122514Sdarrenr m->m_pkthdr.len = tlen; 41222514Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *) 0; 41322514Sdarrenr nth->th_seq = htonl(seq); 41422514Sdarrenr nth->th_ack = htonl(ack); 41522514Sdarrenr nth->th_x2 = 0; 41622514Sdarrenr nth->th_off = sizeof (struct tcphdr) >> 2; 41722514Sdarrenr nth->th_flags = flags; 41822514Sdarrenr if (tp) 41922514Sdarrenr nth->th_win = htons((u_short) (win >> tp->rcv_scale)); 42022514Sdarrenr else 42122514Sdarrenr nth->th_win = htons((u_short)win); 42222514Sdarrenr nth->th_urp = 0; 42322514Sdarrenr#ifdef INET6 42422514Sdarrenr if (isipv6) { 42522514Sdarrenr nth->th_sum = 0; 42622514Sdarrenr nth->th_sum = in6_cksum(m, IPPROTO_TCP, 42722514Sdarrenr sizeof(struct ip6_hdr), 42822514Sdarrenr tlen - sizeof(struct ip6_hdr)); 42922514Sdarrenr ip6->ip6_hlim = in6_selecthlim(tp ? tp->t_inpcb : NULL, 43022514Sdarrenr ro6 && ro6->ro_rt ? 43122514Sdarrenr ro6->ro_rt->rt_ifp : 43222514Sdarrenr NULL); 43322514Sdarrenr } else 43422514Sdarrenr#endif /* INET6 */ 43522514Sdarrenr { 43622514Sdarrenr nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 43722514Sdarrenr htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p))); 43837074Speter m->m_pkthdr.csum_flags = CSUM_TCP; 43922514Sdarrenr m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 44022514Sdarrenr } 44122514Sdarrenr#ifdef TCPDEBUG 44222514Sdarrenr if (tp == NULL || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)) 44322514Sdarrenr tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0); 44422514Sdarrenr#endif 44522514Sdarrenr#ifdef IPSEC 44622514Sdarrenr if (ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL) != 0) { 44722514Sdarrenr m_freem(m); 44822514Sdarrenr return; 44922514Sdarrenr } 45022514Sdarrenr#endif 45122514Sdarrenr#ifdef INET6 45222514Sdarrenr if (isipv6) { 45322514Sdarrenr (void)ip6_output(m, NULL, ro6, ipflags, NULL, NULL); 45422514Sdarrenr if (ro6 == &sro6 && ro6->ro_rt) { 45522514Sdarrenr RTFREE(ro6->ro_rt); 45622514Sdarrenr ro6->ro_rt = NULL; 45722514Sdarrenr } 45822514Sdarrenr } else 45922514Sdarrenr#endif /* INET6 */ 46022514Sdarrenr { 46122514Sdarrenr (void) ip_output(m, NULL, ro, ipflags, NULL); 46222514Sdarrenr if (ro == &sro && ro->ro_rt) { 46322514Sdarrenr RTFREE(ro->ro_rt); 46422514Sdarrenr ro->ro_rt = NULL; 46522514Sdarrenr } 46622514Sdarrenr } 46722514Sdarrenr} 46822514Sdarrenr 46922514Sdarrenr/* 47022514Sdarrenr * Create a new TCP control block, making an 47122514Sdarrenr * empty reassembly queue and hooking it to the argument 47222514Sdarrenr * protocol control block. The `inp' parameter must have 47322514Sdarrenr * come from the zone allocator set up in tcp_init(). 47422514Sdarrenr */ 47522514Sdarrenrstruct tcpcb * 47622514Sdarrenrtcp_newtcpcb(inp) 47722514Sdarrenr struct inpcb *inp; 47822514Sdarrenr{ 47922514Sdarrenr struct inp_tp *it; 48022514Sdarrenr register struct tcpcb *tp; 48122514Sdarrenr#ifdef INET6 48222514Sdarrenr int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 48322514Sdarrenr#endif /* INET6 */ 48422514Sdarrenr 48522514Sdarrenr it = (struct inp_tp *)inp; 48622514Sdarrenr tp = &it->tcb; 48722514Sdarrenr bzero((char *) tp, sizeof(struct tcpcb)); 48822514Sdarrenr LIST_INIT(&tp->t_segq); 48922514Sdarrenr tp->t_maxseg = tp->t_maxopd = 49022514Sdarrenr#ifdef INET6 49122514Sdarrenr isipv6 ? tcp_v6mssdflt : 49222514Sdarrenr#endif /* INET6 */ 49322514Sdarrenr tcp_mssdflt; 49422514Sdarrenr 49522514Sdarrenr /* Set up our timeouts. */ 49622514Sdarrenr callout_init(tp->tt_rexmt = &it->inp_tp_rexmt, 0); 49722514Sdarrenr callout_init(tp->tt_persist = &it->inp_tp_persist, 0); 49822514Sdarrenr callout_init(tp->tt_keep = &it->inp_tp_keep, 0); 49922514Sdarrenr callout_init(tp->tt_2msl = &it->inp_tp_2msl, 0); 50022514Sdarrenr callout_init(tp->tt_delack = &it->inp_tp_delack, 0); 50122514Sdarrenr 50222514Sdarrenr if (tcp_do_rfc1323) 50322514Sdarrenr tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP); 50422514Sdarrenr if (tcp_do_rfc1644) 50522514Sdarrenr tp->t_flags |= TF_REQ_CC; 50622514Sdarrenr tp->t_inpcb = inp; /* XXX */ 50722514Sdarrenr /* 50822514Sdarrenr * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no 50922514Sdarrenr * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives 51022514Sdarrenr * reasonable initial retransmit time. 51122514Sdarrenr */ 51222514Sdarrenr tp->t_srtt = TCPTV_SRTTBASE; 51322514Sdarrenr tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4; 51422514Sdarrenr tp->t_rttmin = TCPTV_MIN; 51522514Sdarrenr tp->t_rxtcur = TCPTV_RTOBASE; 51622514Sdarrenr tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; 51722514Sdarrenr tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT; 51822514Sdarrenr tp->t_rcvtime = ticks; 51922514Sdarrenr /* 52022514Sdarrenr * IPv4 TTL initialization is necessary for an IPv6 socket as well, 52122514Sdarrenr * because the socket may be bound to an IPv6 wildcard address, 52222514Sdarrenr * which may match an IPv4-mapped IPv6 address. 52322514Sdarrenr */ 52422514Sdarrenr inp->inp_ip_ttl = ip_defttl; 52522514Sdarrenr inp->inp_ppcb = (caddr_t)tp; 52622514Sdarrenr return (tp); /* XXX */ 52722514Sdarrenr} 52822514Sdarrenr 52922514Sdarrenr/* 53022514Sdarrenr * Drop a TCP connection, reporting 53122514Sdarrenr * the specified error. If connection is synchronized, 53222514Sdarrenr * then send a RST to peer. 53322514Sdarrenr */ 53422514Sdarrenrstruct tcpcb * 53522514Sdarrenrtcp_drop(tp, errno) 53622514Sdarrenr register struct tcpcb *tp; 53737074Speter int errno; 53822514Sdarrenr{ 53922514Sdarrenr struct socket *so = tp->t_inpcb->inp_socket; 54022514Sdarrenr 54122514Sdarrenr if (TCPS_HAVERCVDSYN(tp->t_state)) { 54222514Sdarrenr tp->t_state = TCPS_CLOSED; 54322514Sdarrenr (void) tcp_output(tp); 54422514Sdarrenr tcpstat.tcps_drops++; 54522514Sdarrenr } else 54622514Sdarrenr tcpstat.tcps_conndrops++; 54722514Sdarrenr if (errno == ETIMEDOUT && tp->t_softerror) 54822514Sdarrenr errno = tp->t_softerror; 54922514Sdarrenr so->so_error = errno; 55022514Sdarrenr return (tcp_close(tp)); 55122514Sdarrenr} 55222514Sdarrenr 55322514Sdarrenr/* 55422514Sdarrenr * Close a TCP control block: 55522514Sdarrenr * discard all space held by the tcp 55622514Sdarrenr * discard internet protocol block 55722514Sdarrenr * wake up any sleepers 55822514Sdarrenr */ 55922514Sdarrenrstruct tcpcb * 56022514Sdarrenrtcp_close(tp) 56122514Sdarrenr register struct tcpcb *tp; 56222514Sdarrenr{ 56322514Sdarrenr register struct tseg_qent *q; 56422514Sdarrenr struct inpcb *inp = tp->t_inpcb; 56522514Sdarrenr struct socket *so = inp->inp_socket; 56622514Sdarrenr#ifdef INET6 56722514Sdarrenr int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 56822514Sdarrenr#endif /* INET6 */ 56922514Sdarrenr register struct rtentry *rt; 57022514Sdarrenr int dosavessthresh; 57122514Sdarrenr 57222514Sdarrenr /* 57322514Sdarrenr * Make sure that all of our timers are stopped before we 57422514Sdarrenr * delete the PCB. 57522514Sdarrenr */ 57622514Sdarrenr callout_stop(tp->tt_rexmt); 57722514Sdarrenr callout_stop(tp->tt_persist); 57822514Sdarrenr callout_stop(tp->tt_keep); 57922514Sdarrenr callout_stop(tp->tt_2msl); 58022514Sdarrenr callout_stop(tp->tt_delack); 58122514Sdarrenr 58222514Sdarrenr /* 58322514Sdarrenr * If we got enough samples through the srtt filter, 58422514Sdarrenr * save the rtt and rttvar in the routing entry. 58522514Sdarrenr * 'Enough' is arbitrarily defined as the 16 samples. 58622514Sdarrenr * 16 samples is enough for the srtt filter to converge 58722514Sdarrenr * to within 5% of the correct value; fewer samples and 58822514Sdarrenr * we could save a very bogus rtt. 58922514Sdarrenr * 59022514Sdarrenr * Don't update the default route's characteristics and don't 59122514Sdarrenr * update anything that the user "locked". 59222514Sdarrenr */ 59322514Sdarrenr if (tp->t_rttupdated >= 16) { 59422514Sdarrenr register u_long i = 0; 59522514Sdarrenr#ifdef INET6 59622514Sdarrenr if (isipv6) { 59722514Sdarrenr struct sockaddr_in6 *sin6; 59822514Sdarrenr 59922514Sdarrenr if ((rt = inp->in6p_route.ro_rt) == NULL) 60022514Sdarrenr goto no_valid_rt; 60122514Sdarrenr sin6 = (struct sockaddr_in6 *)rt_key(rt); 60222514Sdarrenr if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 60322514Sdarrenr goto no_valid_rt; 60422514Sdarrenr } 60522514Sdarrenr else 60622514Sdarrenr#endif /* INET6 */ 60722514Sdarrenr if ((rt = inp->inp_route.ro_rt) == NULL || 60822514Sdarrenr ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr 60922514Sdarrenr == INADDR_ANY) 61022514Sdarrenr goto no_valid_rt; 61122514Sdarrenr 61222514Sdarrenr if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) { 61322514Sdarrenr i = tp->t_srtt * 61422514Sdarrenr (RTM_RTTUNIT / (hz * TCP_RTT_SCALE)); 61522514Sdarrenr if (rt->rt_rmx.rmx_rtt && i) 61622514Sdarrenr /* 61722514Sdarrenr * filter this update to half the old & half 61822514Sdarrenr * the new values, converting scale. 61922514Sdarrenr * See route.h and tcp_var.h for a 62022514Sdarrenr * description of the scaling constants. 62122514Sdarrenr */ 62222514Sdarrenr rt->rt_rmx.rmx_rtt = 62322514Sdarrenr (rt->rt_rmx.rmx_rtt + i) / 2; 62422514Sdarrenr else 62522514Sdarrenr rt->rt_rmx.rmx_rtt = i; 62622514Sdarrenr tcpstat.tcps_cachedrtt++; 62722514Sdarrenr } 62822514Sdarrenr if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) { 62922514Sdarrenr i = tp->t_rttvar * 63022514Sdarrenr (RTM_RTTUNIT / (hz * TCP_RTTVAR_SCALE)); 63122514Sdarrenr if (rt->rt_rmx.rmx_rttvar && i) 63222514Sdarrenr rt->rt_rmx.rmx_rttvar = 63322514Sdarrenr (rt->rt_rmx.rmx_rttvar + i) / 2; 63422514Sdarrenr else 63522514Sdarrenr rt->rt_rmx.rmx_rttvar = i; 63622514Sdarrenr tcpstat.tcps_cachedrttvar++; 63722514Sdarrenr } 63822514Sdarrenr /* 63922514Sdarrenr * The old comment here said: 64022514Sdarrenr * update the pipelimit (ssthresh) if it has been updated 64122514Sdarrenr * already or if a pipesize was specified & the threshhold 64222514Sdarrenr * got below half the pipesize. I.e., wait for bad news 64322514Sdarrenr * before we start updating, then update on both good 64422514Sdarrenr * and bad news. 64522514Sdarrenr * 64622514Sdarrenr * But we want to save the ssthresh even if no pipesize is 64722514Sdarrenr * specified explicitly in the route, because such 64822514Sdarrenr * connections still have an implicit pipesize specified 64922514Sdarrenr * by the global tcp_sendspace. In the absence of a reliable 65022514Sdarrenr * way to calculate the pipesize, it will have to do. 65122514Sdarrenr */ 65222514Sdarrenr i = tp->snd_ssthresh; 65322514Sdarrenr if (rt->rt_rmx.rmx_sendpipe != 0) 65422514Sdarrenr dosavessthresh = (i < rt->rt_rmx.rmx_sendpipe / 2); 65522514Sdarrenr else 65622514Sdarrenr dosavessthresh = (i < so->so_snd.sb_hiwat / 2); 65722514Sdarrenr if (((rt->rt_rmx.rmx_locks & RTV_SSTHRESH) == 0 && 65822514Sdarrenr i != 0 && rt->rt_rmx.rmx_ssthresh != 0) 65922514Sdarrenr || dosavessthresh) { 66022514Sdarrenr /* 66122514Sdarrenr * convert the limit from user data bytes to 66222514Sdarrenr * packets then to packet data bytes. 66322514Sdarrenr */ 66422514Sdarrenr i = (i + tp->t_maxseg / 2) / tp->t_maxseg; 66522514Sdarrenr if (i < 2) 66622514Sdarrenr i = 2; 66722514Sdarrenr i *= (u_long)(tp->t_maxseg + 66822514Sdarrenr#ifdef INET6 66922514Sdarrenr (isipv6 ? sizeof (struct ip6_hdr) + 67022514Sdarrenr sizeof (struct tcphdr) : 67122514Sdarrenr#endif 67222514Sdarrenr sizeof (struct tcpiphdr) 67322514Sdarrenr#ifdef INET6 67422514Sdarrenr ) 67522514Sdarrenr#endif 67622514Sdarrenr ); 67722514Sdarrenr if (rt->rt_rmx.rmx_ssthresh) 67822514Sdarrenr rt->rt_rmx.rmx_ssthresh = 67922514Sdarrenr (rt->rt_rmx.rmx_ssthresh + i) / 2; 68022514Sdarrenr else 68122514Sdarrenr rt->rt_rmx.rmx_ssthresh = i; 68222514Sdarrenr tcpstat.tcps_cachedssthresh++; 68322514Sdarrenr } 68422514Sdarrenr } 68522514Sdarrenr rt = inp->inp_route.ro_rt; 68622514Sdarrenr if (rt) { 68722514Sdarrenr /* 68822514Sdarrenr * mark route for deletion if no information is 68922514Sdarrenr * cached. 69022514Sdarrenr */ 69122514Sdarrenr if ((tp->t_flags & TF_LQ_OVERFLOW) && 69222514Sdarrenr ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0)){ 69322514Sdarrenr if (rt->rt_rmx.rmx_rtt == 0) 69422514Sdarrenr rt->rt_flags |= RTF_DELCLONE; 69522514Sdarrenr } 69622514Sdarrenr } 69722514Sdarrenr no_valid_rt: 69822514Sdarrenr /* free the reassembly queue, if any */ 69922514Sdarrenr while((q = LIST_FIRST(&tp->t_segq)) != NULL) { 70022514Sdarrenr LIST_REMOVE(q, tqe_q); 70122514Sdarrenr m_freem(q->tqe_m); 70222514Sdarrenr FREE(q, M_TSEGQ); 70322514Sdarrenr } 70422514Sdarrenr if (tp->t_template) 70522514Sdarrenr (void) m_free(dtom(tp->t_template)); 70622514Sdarrenr inp->inp_ppcb = NULL; 70722514Sdarrenr soisdisconnected(so); 70822514Sdarrenr#ifdef INET6 70922514Sdarrenr if (INP_CHECK_SOCKAF(so, AF_INET6)) 71022514Sdarrenr in6_pcbdetach(inp); 71122514Sdarrenr else 71222514Sdarrenr#endif /* INET6 */ 71322514Sdarrenr in_pcbdetach(inp); 71422514Sdarrenr tcpstat.tcps_closed++; 71522514Sdarrenr return ((struct tcpcb *)0); 71622514Sdarrenr} 71731183Speter 71822514Sdarrenrvoid 71922514Sdarrenrtcp_drain() 72022514Sdarrenr{ 72122514Sdarrenr if (do_tcpdrain) 72222514Sdarrenr { 72322514Sdarrenr struct inpcb *inpb; 72422514Sdarrenr struct tcpcb *tcpb; 72522514Sdarrenr struct tseg_qent *te; 72622514Sdarrenr 72722514Sdarrenr /* 72822514Sdarrenr * Walk the tcpbs, if existing, and flush the reassembly queue, 72937074Speter * if there is one... 73037074Speter * XXX: The "Net/3" implementation doesn't imply that the TCP 73137074Speter * reassembly queue should be flushed, but in a situation 73222514Sdarrenr * where we're really low on mbufs, this is potentially 73322514Sdarrenr * usefull. 73422514Sdarrenr */ 73522514Sdarrenr LIST_FOREACH(inpb, tcbinfo.listhead, inp_list) { 73622514Sdarrenr if ((tcpb = intotcpcb(inpb))) { 73722514Sdarrenr while ((te = LIST_FIRST(&tcpb->t_segq)) 73837074Speter != NULL) { 73937074Speter LIST_REMOVE(te, tqe_q); 74022514Sdarrenr m_freem(te->tqe_m); 74137074Speter FREE(te, M_TSEGQ); 74237074Speter } 74322514Sdarrenr } 74422514Sdarrenr } 74522514Sdarrenr } 74622514Sdarrenr} 74722514Sdarrenr 74822514Sdarrenr/* 74922514Sdarrenr * Notify a tcp user of an asynchronous error; 75022514Sdarrenr * store error as soft error, but wake up user 75122514Sdarrenr * (for now, won't do anything until can select for soft error). 75222514Sdarrenr * 75322514Sdarrenr * Do not wake up user since there currently is no mechanism for 75422514Sdarrenr * reporting soft errors (yet - a kqueue filter may be added). 75537074Speter */ 75637074Speterstatic void 75722514Sdarrenrtcp_notify(inp, error) 75837074Speter struct inpcb *inp; 75922514Sdarrenr int error; 76022514Sdarrenr{ 76122514Sdarrenr struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb; 76222514Sdarrenr 76322514Sdarrenr /* 76422514Sdarrenr * Ignore some errors if we are hooked up. 76522514Sdarrenr * If connection hasn't completed, has retransmitted several times, 76622514Sdarrenr * and receives a second error, give up now. This is better 76722514Sdarrenr * than waiting a long time to establish a connection that 76822514Sdarrenr * can never complete. 76922514Sdarrenr */ 77022514Sdarrenr if (tp->t_state == TCPS_ESTABLISHED && 77122514Sdarrenr (error == EHOSTUNREACH || error == ENETUNREACH || 77222514Sdarrenr error == EHOSTDOWN)) { 77322514Sdarrenr return; 77437074Speter } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 && 77522514Sdarrenr tp->t_softerror) 77622514Sdarrenr tcp_drop(tp, error); 77722514Sdarrenr else 77822514Sdarrenr tp->t_softerror = error; 77922514Sdarrenr#if 0 78022514Sdarrenr wakeup((caddr_t) &so->so_timeo); 78122514Sdarrenr sorwakeup(so); 78237074Speter sowwakeup(so); 78322514Sdarrenr#endif 78422514Sdarrenr} 78522514Sdarrenr 78622514Sdarrenrstatic int 78722514Sdarrenrtcp_pcblist(SYSCTL_HANDLER_ARGS) 78837074Speter{ 78922514Sdarrenr int error, i, n, s; 79022514Sdarrenr struct inpcb *inp, **inp_list; 79122514Sdarrenr inp_gen_t gencnt; 79222514Sdarrenr struct xinpgen xig; 79322514Sdarrenr 79437074Speter /* 79522514Sdarrenr * The process of preparing the TCB list is too time-consuming and 79622514Sdarrenr * resource-intensive to repeat twice on every request. 79722514Sdarrenr */ 79822514Sdarrenr if (req->oldptr == 0) { 79922514Sdarrenr n = tcbinfo.ipi_count; 80022514Sdarrenr req->oldidx = 2 * (sizeof xig) 80137074Speter + (n + n/8) * sizeof(struct xtcpcb); 80222514Sdarrenr return 0; 80322514Sdarrenr } 80422514Sdarrenr 80522514Sdarrenr if (req->newptr != 0) 80622514Sdarrenr return EPERM; 80722514Sdarrenr 80822514Sdarrenr /* 80922514Sdarrenr * OK, now we're committed to doing something. 81022514Sdarrenr */ 81122514Sdarrenr s = splnet(); 81222514Sdarrenr gencnt = tcbinfo.ipi_gencnt; 81337074Speter n = tcbinfo.ipi_count; 81437074Speter splx(s); 81537074Speter 81622514Sdarrenr xig.xig_len = sizeof xig; 81722514Sdarrenr xig.xig_count = n; 81822514Sdarrenr xig.xig_gen = gencnt; 81922514Sdarrenr xig.xig_sogen = so_gencnt; 82022514Sdarrenr error = SYSCTL_OUT(req, &xig, sizeof xig); 82122514Sdarrenr if (error) 82222514Sdarrenr return error; 82337074Speter 82422514Sdarrenr inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 82522514Sdarrenr if (inp_list == 0) 82622514Sdarrenr return ENOMEM; 82722514Sdarrenr 82822514Sdarrenr s = splnet(); 82937074Speter for (inp = LIST_FIRST(tcbinfo.listhead), i = 0; inp && i < n; 83022514Sdarrenr inp = LIST_NEXT(inp, inp_list)) { 83122514Sdarrenr if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) 83222514Sdarrenr inp_list[i++] = inp; 83322514Sdarrenr } 83422514Sdarrenr splx(s); 83537074Speter n = i; 83622514Sdarrenr 83722514Sdarrenr error = 0; 83822514Sdarrenr for (i = 0; i < n; i++) { 83922514Sdarrenr inp = inp_list[i]; 84022514Sdarrenr if (inp->inp_gencnt <= gencnt) { 84137074Speter struct xtcpcb xt; 84222514Sdarrenr caddr_t inp_ppcb; 84322514Sdarrenr xt.xt_len = sizeof xt; 84422514Sdarrenr /* XXX should avoid extra copy */ 84522514Sdarrenr bcopy(inp, &xt.xt_inp, sizeof *inp); 84622514Sdarrenr inp_ppcb = inp->inp_ppcb; 84722514Sdarrenr if (inp_ppcb != NULL) 84831183Speter bcopy(inp_ppcb, &xt.xt_tp, sizeof xt.xt_tp); 84922514Sdarrenr else 85031183Speter bzero((char *) &xt.xt_tp, sizeof xt.xt_tp); 85131183Speter if (inp->inp_socket) 85222514Sdarrenr sotoxsocket(inp->inp_socket, &xt.xt_socket); 85322514Sdarrenr error = SYSCTL_OUT(req, &xt, sizeof xt); 85437074Speter } 85522514Sdarrenr } 85622514Sdarrenr if (!error) { 85722514Sdarrenr /* 85822514Sdarrenr * Give the user an updated idea of our state. 85922514Sdarrenr * If the generation differs from what we told 86022514Sdarrenr * her before, she knows that something happened 86122514Sdarrenr * while we were processing this request, and it 86222514Sdarrenr * might be necessary to retry. 86322514Sdarrenr */ 86422514Sdarrenr s = splnet(); 86522514Sdarrenr xig.xig_gen = tcbinfo.ipi_gencnt; 86622514Sdarrenr xig.xig_sogen = so_gencnt; 86722514Sdarrenr xig.xig_count = tcbinfo.ipi_count; 86822514Sdarrenr splx(s); 86922514Sdarrenr error = SYSCTL_OUT(req, &xig, sizeof xig); 87022514Sdarrenr } 87122514Sdarrenr free(inp_list, M_TEMP); 87222514Sdarrenr return error; 87322514Sdarrenr} 87422514Sdarrenr 87522514SdarrenrSYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 87622514Sdarrenr tcp_pcblist, "S,xtcpcb", "List of active TCP connections"); 87722514Sdarrenr 87822514Sdarrenrstatic int 87931183Spetertcp_getcred(SYSCTL_HANDLER_ARGS) 88022514Sdarrenr{ 88131183Speter struct xucred xuc; 88222514Sdarrenr struct sockaddr_in addrs[2]; 88337074Speter struct inpcb *inp; 88437074Speter int error, s; 88537074Speter 88622514Sdarrenr error = suser(req->p); 88722514Sdarrenr if (error) 88837074Speter return (error); 88922514Sdarrenr error = SYSCTL_IN(req, addrs, sizeof(addrs)); 89034739Speter if (error) 89122514Sdarrenr return (error); 89222514Sdarrenr s = splnet(); 89322514Sdarrenr inp = in_pcblookup_hash(&tcbinfo, addrs[1].sin_addr, addrs[1].sin_port, 89422514Sdarrenr addrs[0].sin_addr, addrs[0].sin_port, 0, NULL); 89522514Sdarrenr if (inp == NULL || inp->inp_socket == NULL) { 89622514Sdarrenr error = ENOENT; 89722514Sdarrenr goto out; 89822514Sdarrenr } 89922514Sdarrenr bzero(&xuc, sizeof(xuc)); 90022514Sdarrenr xuc.cr_uid = inp->inp_socket->so_cred->cr_uid; 90122514Sdarrenr xuc.cr_ngroups = inp->inp_socket->so_cred->cr_ngroups; 90222514Sdarrenr bcopy(inp->inp_socket->so_cred->cr_groups, xuc.cr_groups, 90322514Sdarrenr sizeof(xuc.cr_groups)); 90422514Sdarrenr error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 90522514Sdarrenrout: 90622514Sdarrenr splx(s); 90722514Sdarrenr return (error); 90822514Sdarrenr} 90922514Sdarrenr 91022514SdarrenrSYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 91122514Sdarrenr 0, 0, tcp_getcred, "S,xucred", "Get the xucred of a TCP connection"); 91222514Sdarrenr 91322514Sdarrenr#ifdef INET6 91422514Sdarrenrstatic int 91522514Sdarrenrtcp6_getcred(SYSCTL_HANDLER_ARGS) 91622514Sdarrenr{ 91737074Speter struct xucred xuc; 91822514Sdarrenr struct sockaddr_in6 addrs[2]; 91922514Sdarrenr struct inpcb *inp; 92022514Sdarrenr int error, s, mapped = 0; 92122514Sdarrenr 92222514Sdarrenr error = suser(req->p); 92337074Speter if (error) 92422514Sdarrenr return (error); 92522514Sdarrenr error = SYSCTL_IN(req, addrs, sizeof(addrs)); 92622514Sdarrenr if (error) 92722514Sdarrenr return (error); 92822514Sdarrenr if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) { 92937074Speter if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr)) 93022514Sdarrenr mapped = 1; 93122514Sdarrenr else 93222514Sdarrenr return (EINVAL); 93322514Sdarrenr } 93422514Sdarrenr s = splnet(); 93537074Speter if (mapped == 1) 93622514Sdarrenr inp = in_pcblookup_hash(&tcbinfo, 93722514Sdarrenr *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12], 93822514Sdarrenr addrs[1].sin6_port, 93922514Sdarrenr *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12], 94022514Sdarrenr addrs[0].sin6_port, 94137074Speter 0, NULL); 94222514Sdarrenr else 94322514Sdarrenr inp = in6_pcblookup_hash(&tcbinfo, &addrs[1].sin6_addr, 94422514Sdarrenr addrs[1].sin6_port, 94522514Sdarrenr &addrs[0].sin6_addr, addrs[0].sin6_port, 94622514Sdarrenr 0, NULL); 94737074Speter if (inp == NULL || inp->inp_socket == NULL) { 94822514Sdarrenr error = ENOENT; 94922514Sdarrenr goto out; 95022514Sdarrenr } 95122514Sdarrenr bzero(&xuc, sizeof(xuc)); 95222514Sdarrenr xuc.cr_uid = inp->inp_socket->so_cred->cr_uid; 95322514Sdarrenr xuc.cr_ngroups = inp->inp_socket->so_cred->cr_ngroups; 95422514Sdarrenr bcopy(inp->inp_socket->so_cred->cr_groups, xuc.cr_groups, 95522514Sdarrenr sizeof(xuc.cr_groups)); 95622514Sdarrenr error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 95722514Sdarrenrout: 95822514Sdarrenr splx(s); 95922514Sdarrenr return (error); 96022514Sdarrenr} 96122514Sdarrenr 96222514SdarrenrSYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 96322514Sdarrenr 0, 0, 96422514Sdarrenr tcp6_getcred, "S,xucred", "Get the xucred of a TCP6 connection"); 96522514Sdarrenr#endif 96637074Speter 96722514Sdarrenr 96822514Sdarrenrvoid 96922514Sdarrenrtcp_ctlinput(cmd, sa, vip) 97022514Sdarrenr int cmd; 97122514Sdarrenr struct sockaddr *sa; 97237074Speter void *vip; 97322514Sdarrenr{ 97422514Sdarrenr struct ip *ip = vip; 97522514Sdarrenr struct tcphdr *th; 97622514Sdarrenr struct in_addr faddr; 97722514Sdarrenr struct inpcb *inp; 97837074Speter struct tcpcb *tp; 97922514Sdarrenr void (*notify) __P((struct inpcb *, int)) = tcp_notify; 98022514Sdarrenr tcp_seq icmp_seq; 98122514Sdarrenr int s; 98222514Sdarrenr 98322514Sdarrenr faddr = ((struct sockaddr_in *)sa)->sin_addr; 98437074Speter if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 98522514Sdarrenr return; 98622514Sdarrenr 98722514Sdarrenr if (cmd == PRC_QUENCH) 98822514Sdarrenr notify = tcp_quench; 98922514Sdarrenr else if (icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB || 99037074Speter cmd == PRC_UNREACH_PORT) && ip) 99122514Sdarrenr notify = tcp_drop_syn_sent; 99222514Sdarrenr else if (cmd == PRC_MSGSIZE) 99322514Sdarrenr notify = tcp_mtudisc; 99422514Sdarrenr else if (PRC_IS_REDIRECT(cmd)) { 99522514Sdarrenr ip = 0; 99622514Sdarrenr notify = in_rtchange; 99722514Sdarrenr } else if (cmd == PRC_HOSTDEAD) 99822514Sdarrenr ip = 0; 99922514Sdarrenr else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0) 100022514Sdarrenr return; 100122514Sdarrenr if (ip) { 100237074Speter s = splnet(); 100322514Sdarrenr th = (struct tcphdr *)((caddr_t)ip 100422514Sdarrenr + (IP_VHL_HL(ip->ip_vhl) << 2)); 100522514Sdarrenr inp = in_pcblookup_hash(&tcbinfo, faddr, th->th_dport, 100622514Sdarrenr ip->ip_src, th->th_sport, 0, NULL); 100722514Sdarrenr if (inp != NULL && inp->inp_socket != NULL) { 100837074Speter icmp_seq = htonl(th->th_seq); 100922514Sdarrenr tp = intotcpcb(inp); 101022514Sdarrenr if (SEQ_GEQ(icmp_seq, tp->snd_una) && 101122514Sdarrenr SEQ_LT(icmp_seq, tp->snd_max)) 101222514Sdarrenr (*notify)(inp, inetctlerrmap[cmd]); 101322514Sdarrenr } 101437074Speter splx(s); 101522514Sdarrenr } else 101622514Sdarrenr in_pcbnotifyall(&tcb, faddr, inetctlerrmap[cmd], notify); 101722514Sdarrenr} 101822514Sdarrenr 101922514Sdarrenr#ifdef INET6 102034739Spetervoid 102134739Spetertcp6_ctlinput(cmd, sa, d) 102222514Sdarrenr int cmd; 102334739Speter struct sockaddr *sa; 102422514Sdarrenr void *d; 102522514Sdarrenr{ 102622514Sdarrenr struct tcphdr th; 102722514Sdarrenr void (*notify) __P((struct inpcb *, int)) = tcp_notify; 102822514Sdarrenr struct ip6_hdr *ip6; 102922514Sdarrenr struct mbuf *m; 103022514Sdarrenr struct ip6ctlparam *ip6cp = NULL; 103122514Sdarrenr const struct sockaddr_in6 *sa6_src = NULL; 103234739Speter int off; 103322514Sdarrenr struct tcp_portonly { 103422514Sdarrenr u_int16_t th_sport; 103534739Speter u_int16_t th_dport; 103622514Sdarrenr } *thp; 103722514Sdarrenr 103834739Speter if (sa->sa_family != AF_INET6 || 103922514Sdarrenr sa->sa_len != sizeof(struct sockaddr_in6)) 104022514Sdarrenr return; 104122514Sdarrenr 104222514Sdarrenr if (cmd == PRC_QUENCH) 104322514Sdarrenr notify = tcp_quench; 104422514Sdarrenr else if (cmd == PRC_MSGSIZE) 104522514Sdarrenr notify = tcp_mtudisc; 104622514Sdarrenr else if (!PRC_IS_REDIRECT(cmd) && 104722514Sdarrenr ((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0)) 104822514Sdarrenr return; 104934739Speter 105022514Sdarrenr /* if the parameter is from icmp6, decode it. */ 105122514Sdarrenr if (d != NULL) { 105234739Speter ip6cp = (struct ip6ctlparam *)d; 105334739Speter m = ip6cp->ip6c_m; 105422514Sdarrenr ip6 = ip6cp->ip6c_ip6; 105522514Sdarrenr off = ip6cp->ip6c_off; 105622514Sdarrenr sa6_src = ip6cp->ip6c_src; 105734739Speter } else { 105822514Sdarrenr m = NULL; 105937074Speter ip6 = NULL; 106022514Sdarrenr off = 0; /* fool gcc */ 106122514Sdarrenr sa6_src = &sa6_any; 106222514Sdarrenr } 106322514Sdarrenr 106422514Sdarrenr if (ip6) { 106522514Sdarrenr /* 106634739Speter * XXX: We assume that when IPV6 is non NULL, 106734739Speter * M and OFF are valid. 106834739Speter */ 106934739Speter 107022514Sdarrenr /* check if we can safely examine src and dst ports */ 107122514Sdarrenr if (m->m_pkthdr.len < off + sizeof(*thp)) 107234739Speter return; 107337074Speter 107434739Speter bzero(&th, sizeof(th)); 107534739Speter m_copydata(m, off, sizeof(*thp), (caddr_t)&th); 107622514Sdarrenr 107722514Sdarrenr in6_pcbnotify(&tcb, sa, th.th_dport, 107834739Speter (struct sockaddr *)ip6cp->ip6c_src, 107922514Sdarrenr th.th_sport, cmd, notify); 108022514Sdarrenr } else 108134739Speter in6_pcbnotify(&tcb, sa, 0, (struct sockaddr *)sa6_src, 108222514Sdarrenr 0, cmd, notify); 108322514Sdarrenr} 108437074Speter#endif /* INET6 */ 108534739Speter 108634739Speter#define TCP_RNDISS_ROUNDS 16 108722514Sdarrenr#define TCP_RNDISS_OUT 7200 108822514Sdarrenr#define TCP_RNDISS_MAX 30000 108922514Sdarrenr 109022514Sdarrenru_int8_t tcp_rndiss_sbox[128]; 109122514Sdarrenru_int16_t tcp_rndiss_msb; 109222514Sdarrenru_int16_t tcp_rndiss_cnt; 109334739Speterlong tcp_rndiss_reseed; 109434739Speter 109534739Speteru_int16_t 109622514Sdarrenrtcp_rndiss_encrypt(val) 109722514Sdarrenr u_int16_t val; 109822514Sdarrenr{ 109922514Sdarrenr u_int16_t sum = 0, i; 110022514Sdarrenr 110122514Sdarrenr for (i = 0; i < TCP_RNDISS_ROUNDS; i++) { 110222514Sdarrenr sum += 0x79b9; 110334739Speter val ^= ((u_int16_t)tcp_rndiss_sbox[(val^sum) & 0x7f]) << 7; 110422514Sdarrenr val = ((val & 0xff) << 7) | (val >> 8); 110522514Sdarrenr } 110622514Sdarrenr 110722514Sdarrenr return val; 110822514Sdarrenr} 110922514Sdarrenr 111037074Spetervoid 111137074Spetertcp_rndiss_init() 111234739Speter{ 111322514Sdarrenr struct timeval time; 111422514Sdarrenr 111522514Sdarrenr getmicrotime(&time); 111622514Sdarrenr read_random(tcp_rndiss_sbox, sizeof(tcp_rndiss_sbox)); 111722514Sdarrenr 111822514Sdarrenr tcp_rndiss_reseed = time.tv_sec + TCP_RNDISS_OUT; 111922514Sdarrenr tcp_rndiss_msb = tcp_rndiss_msb == 0x8000 ? 0 : 0x8000; 112022514Sdarrenr tcp_rndiss_cnt = 0; 112122514Sdarrenr} 112222514Sdarrenr 112322514Sdarrenrtcp_seq 112422514Sdarrenrtcp_rndiss_next() 112522514Sdarrenr{ 112622514Sdarrenr u_int16_t tmp; 112737074Speter struct timeval time; 112822514Sdarrenr 112922514Sdarrenr getmicrotime(&time); 113022514Sdarrenr 113122514Sdarrenr if (tcp_rndiss_cnt >= TCP_RNDISS_MAX || 113222514Sdarrenr time.tv_sec > tcp_rndiss_reseed) 113337074Speter tcp_rndiss_init(); 113422514Sdarrenr 113522514Sdarrenr read_random(&tmp, sizeof(tmp)); 113622514Sdarrenr 113722514Sdarrenr /* (tmp & 0x7fff) ensures a 32768 byte gap between ISS */ 113822514Sdarrenr return ((tcp_rndiss_encrypt(tcp_rndiss_cnt++) | tcp_rndiss_msb) <<16) | 113937074Speter (tmp & 0x7fff); 114022514Sdarrenr} 114122514Sdarrenr 114222514Sdarrenr 114322514Sdarrenr/* 114422514Sdarrenr * When a source quench is received, close congestion window 114537074Speter * to one segment. We will gradually open it again as we proceed. 114622514Sdarrenr */ 114722514Sdarrenrvoid 114822514Sdarrenrtcp_quench(inp, errno) 114922514Sdarrenr struct inpcb *inp; 115022514Sdarrenr int errno; 115122514Sdarrenr{ 115237074Speter struct tcpcb *tp = intotcpcb(inp); 115334739Speter 115422514Sdarrenr if (tp) 115522514Sdarrenr tp->snd_cwnd = tp->t_maxseg; 115622514Sdarrenr} 115722514Sdarrenr 115822514Sdarrenr/* 115922514Sdarrenr * When a specific ICMP unreachable message is received and the 116022514Sdarrenr * connection state is SYN-SENT, drop the connection. This behavior 116122514Sdarrenr * is controlled by the icmp_may_rst sysctl. 116222514Sdarrenr */ 116322514Sdarrenrvoid 116422514Sdarrenrtcp_drop_syn_sent(inp, errno) 116537074Speter struct inpcb *inp; 116622514Sdarrenr int errno; 116722514Sdarrenr{ 116822514Sdarrenr struct tcpcb *tp = intotcpcb(inp); 116922514Sdarrenr 117022514Sdarrenr if (tp && tp->t_state == TCPS_SYN_SENT) 117137074Speter tcp_drop(tp, errno); 117222514Sdarrenr} 117322514Sdarrenr 117422514Sdarrenr/* 117522514Sdarrenr * When `need fragmentation' ICMP is received, update our idea of the MSS 117622514Sdarrenr * based on the new value in the route. Also nudge TCP to send something, 117737074Speter * since we know the packet we just sent was dropped. 117822514Sdarrenr * This duplicates some code in the tcp_mss() function in tcp_input.c. 117922514Sdarrenr */ 118022514Sdarrenrvoid 118122514Sdarrenrtcp_mtudisc(inp, errno) 118222514Sdarrenr struct inpcb *inp; 118337074Speter int errno; 118422514Sdarrenr{ 118522514Sdarrenr struct tcpcb *tp = intotcpcb(inp); 118622514Sdarrenr struct rtentry *rt; 118722514Sdarrenr struct rmxp_tao *taop; 118834739Speter struct socket *so = inp->inp_socket; 118934739Speter int offered; 119034739Speter int mss; 119134739Speter#ifdef INET6 119234739Speter int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; 119334739Speter#endif /* INET6 */ 119434739Speter 119534739Speter if (tp) { 119634739Speter#ifdef INET6 119734739Speter if (isipv6) 119834739Speter rt = tcp_rtlookup6(inp); 119934739Speter else 120034739Speter#endif /* INET6 */ 120134739Speter rt = tcp_rtlookup(inp); 120222514Sdarrenr if (!rt || !rt->rt_rmx.rmx_mtu) { 120322514Sdarrenr tp->t_maxopd = tp->t_maxseg = 120422514Sdarrenr#ifdef INET6 120522514Sdarrenr isipv6 ? tcp_v6mssdflt : 120622514Sdarrenr#endif /* INET6 */ 120722514Sdarrenr tcp_mssdflt; 120822514Sdarrenr return; 120922514Sdarrenr } 121022514Sdarrenr taop = rmx_taop(rt->rt_rmx); 121122514Sdarrenr offered = taop->tao_mssopt; 121222514Sdarrenr mss = rt->rt_rmx.rmx_mtu - 121322514Sdarrenr#ifdef INET6 121422514Sdarrenr (isipv6 ? 121522514Sdarrenr sizeof(struct ip6_hdr) + sizeof(struct tcphdr) : 121622514Sdarrenr#endif /* INET6 */ 121722514Sdarrenr sizeof(struct tcpiphdr) 121822514Sdarrenr#ifdef INET6 121922514Sdarrenr ) 122022514Sdarrenr#endif /* INET6 */ 122122514Sdarrenr ; 122222514Sdarrenr 122322514Sdarrenr if (offered) 122422514Sdarrenr mss = min(mss, offered); 122522514Sdarrenr /* 122622514Sdarrenr * XXX - The above conditional probably violates the TCP 122737074Speter * spec. The problem is that, since we don't know the 122837074Speter * other end's MSS, we are supposed to use a conservative 122922514Sdarrenr * default. But, if we do that, then MTU discovery will 123022514Sdarrenr * never actually take place, because the conservative 123122514Sdarrenr * default is much less than the MTUs typically seen 123237074Speter * on the Internet today. For the moment, we'll sweep 123322514Sdarrenr * this under the carpet. 123434739Speter * 123534739Speter * The conservative default might not actually be a problem 123634739Speter * if the only case this occurs is when sending an initial 123722514Sdarrenr * SYN with options and data to a host we've never talked 123822514Sdarrenr * to before. Then, they will reply with an MSS value which 123922514Sdarrenr * will get recorded and the new parameters should get 124022514Sdarrenr * recomputed. For Further Study. 124122514Sdarrenr */ 124222514Sdarrenr if (tp->t_maxopd <= mss) 124337074Speter return; 124422514Sdarrenr tp->t_maxopd = mss; 124522514Sdarrenr 124622514Sdarrenr if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP && 124722514Sdarrenr (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP) 124822514Sdarrenr mss -= TCPOLEN_TSTAMP_APPA; 124922514Sdarrenr if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC && 125022514Sdarrenr (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC) 125122514Sdarrenr mss -= TCPOLEN_CC_APPA; 125237074Speter#if (MCLBYTES & (MCLBYTES - 1)) == 0 125322514Sdarrenr if (mss > MCLBYTES) 125422514Sdarrenr mss &= ~(MCLBYTES-1); 125522514Sdarrenr#else 125622514Sdarrenr if (mss > MCLBYTES) 125722514Sdarrenr mss = mss / MCLBYTES * MCLBYTES; 125822514Sdarrenr#endif 125922514Sdarrenr if (so->so_snd.sb_hiwat < mss) 126037074Speter mss = so->so_snd.sb_hiwat; 126122514Sdarrenr 126222514Sdarrenr tp->t_maxseg = mss; 126322514Sdarrenr 126422514Sdarrenr tcpstat.tcps_mturesent++; 126522514Sdarrenr tp->t_rtttime = 0; 126622514Sdarrenr tp->snd_nxt = tp->snd_una; 126722514Sdarrenr tcp_output(tp); 126837074Speter } 126922514Sdarrenr} 127022514Sdarrenr 127122514Sdarrenr/* 127222514Sdarrenr * Look-up the routing entry to the peer of this inpcb. If no route 127322514Sdarrenr * is found and it cannot be allocated the return NULL. This routine 127422514Sdarrenr * is called by TCP routines that access the rmx structure and by tcp_mss 127522514Sdarrenr * to get the interface MTU. 127622514Sdarrenr */ 127722514Sdarrenrstruct rtentry * 127822514Sdarrenrtcp_rtlookup(inp) 127922514Sdarrenr struct inpcb *inp; 128022514Sdarrenr{ 128122514Sdarrenr struct route *ro; 128222514Sdarrenr struct rtentry *rt; 128322514Sdarrenr 128422514Sdarrenr ro = &inp->inp_route; 128522514Sdarrenr rt = ro->ro_rt; 128622514Sdarrenr if (rt == NULL || !(rt->rt_flags & RTF_UP)) { 128722514Sdarrenr /* No route yet, so try to acquire one */ 128822514Sdarrenr if (inp->inp_faddr.s_addr != INADDR_ANY) { 128922514Sdarrenr ro->ro_dst.sa_family = AF_INET; 129022514Sdarrenr ro->ro_dst.sa_len = sizeof(ro->ro_dst); 129122514Sdarrenr ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 129222514Sdarrenr inp->inp_faddr; 129322514Sdarrenr rtalloc(ro); 129422514Sdarrenr rt = ro->ro_rt; 129522514Sdarrenr } 129622514Sdarrenr } 129722514Sdarrenr return rt; 129822514Sdarrenr} 129922514Sdarrenr 130022514Sdarrenr#ifdef INET6 130122514Sdarrenrstruct rtentry * 130222514Sdarrenrtcp_rtlookup6(inp) 130322514Sdarrenr struct inpcb *inp; 130422514Sdarrenr{ 130522514Sdarrenr struct route_in6 *ro6; 130622514Sdarrenr struct rtentry *rt; 130722514Sdarrenr 130822514Sdarrenr ro6 = &inp->in6p_route; 130922514Sdarrenr rt = ro6->ro_rt; 131022514Sdarrenr if (rt == NULL || !(rt->rt_flags & RTF_UP)) { 131122514Sdarrenr /* No route yet, so try to acquire one */ 131222514Sdarrenr if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 131322514Sdarrenr struct sockaddr_in6 *dst6; 131422514Sdarrenr 131522514Sdarrenr dst6 = (struct sockaddr_in6 *)&ro6->ro_dst; 131622514Sdarrenr dst6->sin6_family = AF_INET6; 131722514Sdarrenr dst6->sin6_len = sizeof(ro6->ro_dst); 131822514Sdarrenr dst6->sin6_addr = inp->in6p_faddr; 131922514Sdarrenr rtalloc((struct route *)ro6); 132022514Sdarrenr rt = ro6->ro_rt; 132122514Sdarrenr } 132237074Speter } 132322514Sdarrenr return rt; 132422514Sdarrenr} 132522514Sdarrenr#endif /* INET6 */ 132622514Sdarrenr 132722514Sdarrenr#ifdef IPSEC 132822514Sdarrenr/* compute ESP/AH header size for TCP, including outer IP header. */ 132922514Sdarrenrsize_t 133022514Sdarrenripsec_hdrsiz_tcp(tp) 133122514Sdarrenr struct tcpcb *tp; 133222514Sdarrenr{ 133322514Sdarrenr struct inpcb *inp; 1334 struct mbuf *m; 1335 size_t hdrsiz; 1336 struct ip *ip; 1337#ifdef INET6 1338 struct ip6_hdr *ip6; 1339#endif /* INET6 */ 1340 struct tcphdr *th; 1341 1342 if (!tp || !tp->t_template || !(inp = tp->t_inpcb)) 1343 return 0; 1344 MGETHDR(m, M_DONTWAIT, MT_DATA); 1345 if (!m) 1346 return 0; 1347 1348#ifdef INET6 1349 if ((inp->inp_vflag & INP_IPV6) != 0) { 1350 ip6 = mtod(m, struct ip6_hdr *); 1351 th = (struct tcphdr *)(ip6 + 1); 1352 m->m_pkthdr.len = m->m_len = 1353 sizeof(struct ip6_hdr) + sizeof(struct tcphdr); 1354 bcopy((caddr_t)tp->t_template->tt_ipgen, (caddr_t)ip6, 1355 sizeof(struct ip6_hdr)); 1356 bcopy((caddr_t)&tp->t_template->tt_t, (caddr_t)th, 1357 sizeof(struct tcphdr)); 1358 hdrsiz = ipsec6_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); 1359 } else 1360#endif /* INET6 */ 1361 { 1362 ip = mtod(m, struct ip *); 1363 th = (struct tcphdr *)(ip + 1); 1364 m->m_pkthdr.len = m->m_len = sizeof(struct tcpiphdr); 1365 bcopy((caddr_t)tp->t_template->tt_ipgen, (caddr_t)ip, 1366 sizeof(struct ip)); 1367 bcopy((caddr_t)&tp->t_template->tt_t, (caddr_t)th, 1368 sizeof(struct tcphdr)); 1369 ip->ip_vhl = IP_VHL_BORING; 1370 hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); 1371 } 1372 1373 m_free(m); 1374 return hdrsiz; 1375} 1376#endif /*IPSEC*/ 1377 1378/* 1379 * Return a pointer to the cached information about the remote host. 1380 * The cached information is stored in the protocol specific part of 1381 * the route metrics. 1382 */ 1383struct rmxp_tao * 1384tcp_gettaocache(inp) 1385 struct inpcb *inp; 1386{ 1387 struct rtentry *rt; 1388 1389#ifdef INET6 1390 if ((inp->inp_vflag & INP_IPV6) != 0) 1391 rt = tcp_rtlookup6(inp); 1392 else 1393#endif /* INET6 */ 1394 rt = tcp_rtlookup(inp); 1395 1396 /* Make sure this is a host route and is up. */ 1397 if (rt == NULL || 1398 (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) 1399 return NULL; 1400 1401 return rmx_taop(rt->rt_rmx); 1402} 1403 1404/* 1405 * Clear all the TAO cache entries, called from tcp_init. 1406 * 1407 * XXX 1408 * This routine is just an empty one, because we assume that the routing 1409 * routing tables are initialized at the same time when TCP, so there is 1410 * nothing in the cache left over. 1411 */ 1412static void 1413tcp_cleartaocache() 1414{ 1415} 1416