X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/1c79356b52d46aa6b508fb032f5ae709b1f2897b..c331a0bec715536613c8dd5f34a4e115d5b15824:/bsd/netinet/tcp_subr.c?ds=sidebyside diff --git a/bsd/netinet/tcp_subr.c b/bsd/netinet/tcp_subr.c index 45ae7ffed..d675d776b 100644 --- a/bsd/netinet/tcp_subr.c +++ b/bsd/netinet/tcp_subr.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2008 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 @@ -52,50 +58,63 @@ * SUCH DAMAGE. * * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95 + * $FreeBSD: src/sys/netinet/tcp_subr.c,v 1.73.2.22 2001/08/22 00:59:12 silby Exp $ + */ +/* + * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. */ - -#if ISFB31 -#include "opt_compat.h" -#include "opt_tcpdebug.h" -#endif #include #include +#include #include #include #include #include #include +#include +#include #include #include #include +#include #include - - -#if ISFB31 -#include -#endif +#include +#include #include #include +#define tcp_minmssoverload fring #define _IP_VHL #include #include #include +#include +#if INET6 +#include +#endif #include +#if INET6 +#include +#endif #include #include +#include #if INET6 -#include #include -#include #endif #include #include #include #include #include +#if INET6 +#include +#endif #include #if TCPDEBUG #include @@ -104,41 +123,117 @@ #if IPSEC #include +#if INET6 +#include +#endif #endif /*IPSEC*/ +#undef tcp_minmssoverload + +#if CONFIG_MACF_NET +#include +#endif /* MAC_NET */ + +#include #include #define DBG_FNC_TCP_CLOSE NETDBG_CODE(DBG_NETTCP, ((5 << 8) | 2)) +extern int tcp_lq_overflow; + +/* temporary: for testing */ +#if IPSEC +extern int ipsec_bypass; +#endif int tcp_mssdflt = TCP_MSS; -SYSCTL_INT(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt, - CTLFLAG_RW, &tcp_mssdflt , 0, ""); +SYSCTL_INT(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt, CTLFLAG_RW, + &tcp_mssdflt , 0, "Default TCP Maximum Segment Size"); -int tcp_v6mssdflt = TCP6_MSS; +#if INET6 +int tcp_v6mssdflt = TCP6_MSS; SYSCTL_INT(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt, - CTLFLAG_RW, &tcp_v6mssdflt , 0, ""); + CTLFLAG_RW, &tcp_v6mssdflt , 0, + "Default TCP Maximum Segment Size for IPv6"); +#endif -static int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ; -SYSCTL_INT(_net_inet_tcp, TCPCTL_RTTDFLT, rttdflt, - CTLFLAG_RW, &tcp_rttdflt , 0, ""); +/* + * Minimum MSS we accept and use. This prevents DoS attacks where + * we are forced to a ridiculous low MSS like 20 and send hundreds + * of packets instead of one. The effect scales with the available + * bandwidth and quickly saturates the CPU and network interface + * with packet generation and sending. Set to zero to disable MINMSS + * checking. This setting prevents us from sending too small packets. + */ +int tcp_minmss = TCP_MINMSS; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_RW, + &tcp_minmss , 0, "Minmum TCP Maximum Segment Size"); + +/* + * Number of TCP segments per second we accept from remote host + * before we start to calculate average segment size. If average + * segment size drops below the minimum TCP MSS we assume a DoS + * attack and reset+drop the connection. Care has to be taken not to + * set this value too small to not kill interactive type connections + * (telnet, SSH) which send many small packets. + */ +#ifdef FIX_WORKAROUND_FOR_3894301 +__private_extern__ int tcp_minmssoverload = TCP_MINMSSOVERLOAD; +#else +__private_extern__ int tcp_minmssoverload = 0; +#endif +SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmssoverload, CTLFLAG_RW, + &tcp_minmssoverload , 0, "Number of TCP Segments per Second allowed to" + "be under the MINMSS Size"); static int tcp_do_rfc1323 = 1; -SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, - CTLFLAG_RW, &tcp_do_rfc1323 , 0, ""); +SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_RW, + &tcp_do_rfc1323 , 0, "Enable rfc1323 (high performance TCP) extensions"); static int tcp_do_rfc1644 = 0; -SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1644, rfc1644, - CTLFLAG_RW, &tcp_do_rfc1644 , 0, ""); +SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1644, rfc1644, CTLFLAG_RW, + &tcp_do_rfc1644 , 0, "Enable rfc1644 (TTCP) extensions"); -SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD, &tcbinfo.ipi_count, - 0, "Number of active PCBs"); +static int do_tcpdrain = 0; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0, + "Enable tcp_drain routine for extra help when low on mbufs"); -static void tcp_cleartaocache __P((void)); -static void tcp_notify __P((struct inpcb *, int)); -extern u_long current_active_connections; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD, + &tcbinfo.ipi_count, 0, "Number of active PCBs"); +static int icmp_may_rst = 1; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_RW, &icmp_may_rst, 0, + "Certain ICMP unreachable messages may abort connections in SYN_SENT"); +static int tcp_strict_rfc1948 = 0; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, strict_rfc1948, CTLFLAG_RW, + &tcp_strict_rfc1948, 0, "Determines if RFC1948 is followed exactly"); + +static int tcp_isn_reseed_interval = 0; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_RW, + &tcp_isn_reseed_interval, 0, "Seconds between reseeding of ISN secret"); +static int tcp_background_io_enabled = 1; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, background_io_enabled, CTLFLAG_RW, + &tcp_background_io_enabled, 0, "Background IO Enabled"); + +int tcp_TCPTV_MIN = 1; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, rtt_min, CTLFLAG_RW, + &tcp_TCPTV_MIN, 0, "min rtt value allowed"); + +__private_extern__ int tcp_use_randomport = 0; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, randomize_ports, CTLFLAG_RW, + &tcp_use_randomport, 0, "Randomize TCP port numbers"); + +static void tcp_cleartaocache(void); +static void tcp_notify(struct inpcb *, int); +struct zone *sack_hole_zone; + +extern unsigned int total_mb_cnt; +extern unsigned int total_cl_cnt; +extern int sbspace_factor; +extern int tcp_sockthreshold; +extern int slowlink_wsize; /* window correction for slow links */ +extern int path_mtu_discovery; /* @@ -148,9 +243,13 @@ extern u_long current_active_connections; * variable net.inet.tcp.tcbhashsize */ #ifndef TCBHASHSIZE -#define TCBHASHSIZE 4096 +#define TCBHASHSIZE CONFIG_TCBHASHSIZE #endif +__private_extern__ int tcp_tcbhashsize = TCBHASHSIZE; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD, + &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable"); + /* * This is the actual shape of what we allocate using the zone * allocator. Doing it this way allows us to protect both structures @@ -171,26 +270,26 @@ struct inp_tp { #undef ALIGNMENT #undef ALIGNM1 -static struct tcpcb dummy_tcb; - - extern struct inpcbhead time_wait_slots[]; -extern int cur_tw_slot; -extern u_long *delack_bitmask; +extern u_int32_t *delack_bitmask; + +int get_inpcb_str_size(void); +int get_tcp_str_size(void); +static void tcpcb_to_otcpcb(struct tcpcb *, struct otcpcb *); -int get_inpcb_str_size() +int get_inpcb_str_size(void) { return sizeof(struct inpcb); } -int get_tcp_str_size() +int get_tcp_str_size(void) { return sizeof(struct tcpcb); } -int tcp_freeq __P((struct tcpcb *tp)); +int tcp_freeq(struct tcpcb *tp); /* @@ -199,49 +298,66 @@ int tcp_freeq __P((struct tcpcb *tp)); void tcp_init() { - int hashsize; - vm_size_t str_size; - int i; - - tcp_iss = random(); /* wrong, but better than a constant */ + vm_size_t str_size; + int i; + struct inpcbinfo *pcbinfo; + tcp_ccgen = 1; tcp_cleartaocache(); + + tcp_keepinit = TCPTV_KEEP_INIT; + tcp_keepidle = TCPTV_KEEP_IDLE; + tcp_keepintvl = TCPTV_KEEPINTVL; + tcp_maxpersistidle = TCPTV_KEEP_IDLE; + tcp_msl = TCPTV_MSL; + read_random(&tcp_now, sizeof(tcp_now)); + tcp_now = tcp_now & 0x3fffffff; /* Starts tcp internal 100ms clock at a random value */ + + LIST_INIT(&tcb); tcbinfo.listhead = &tcb; - if (!(getenv_int("net.inet.tcp.tcbhashsize", &hashsize))) - hashsize = TCBHASHSIZE; - if (!powerof2(hashsize)) { + pcbinfo = &tcbinfo; + if (!powerof2(tcp_tcbhashsize)) { printf("WARNING: TCB hash size not a power of 2\n"); - hashsize = 512; /* safe default */ + tcp_tcbhashsize = 512; /* safe default */ } - tcbinfo.hashsize = hashsize; - tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask); - tcbinfo.porthashbase = hashinit(hashsize, M_PCB, + tcbinfo.hashsize = tcp_tcbhashsize; + tcbinfo.hashbase = hashinit(tcp_tcbhashsize, M_PCB, &tcbinfo.hashmask); + tcbinfo.porthashbase = hashinit(tcp_tcbhashsize, M_PCB, &tcbinfo.porthashmask); -#if ISFB31 - tcbinfo.ipi_zone = (void *) zinit("tcpcb", sizeof(struct inp_tp), maxsockets, - ZONE_INTERRUPT, 0); -#else str_size = (vm_size_t) sizeof(struct inp_tp); - tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "inpcb_zone"); -#endif + tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "tcpcb"); + sack_hole_zone = zinit(str_size, 120000*str_size, 8192, "sack_hole zone"); + tcp_reass_maxseg = nmbclusters / 16; + #if INET6 -#define TCP_LGHDR (sizeof(struct tcpip6hdr)) +#define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr)) #else /* INET6 */ -#define TCP_LGHDR (sizeof(struct tcpiphdr)) +#define TCP_MINPROTOHDR (sizeof(struct tcpiphdr)) #endif /* INET6 */ - if (max_protohdr < TCP_LGHDR) - max_protohdr = TCP_LGHDR; - if ((max_linkhdr + TCP_LGHDR) > MHLEN) + if (max_protohdr < TCP_MINPROTOHDR) + max_protohdr = TCP_MINPROTOHDR; + if (max_linkhdr + TCP_MINPROTOHDR > MHLEN) panic("tcp_init"); +#undef TCP_MINPROTOHDR + + /* + * allocate lock group attribute and group for tcp pcb mutexes + */ + pcbinfo->mtx_grp_attr = lck_grp_attr_alloc_init(); + pcbinfo->mtx_grp = lck_grp_alloc_init("tcppcb", pcbinfo->mtx_grp_attr); + + /* + * allocate the lock attribute for tcp pcb mutexes + */ + pcbinfo->mtx_attr = lck_attr_alloc_init(); - tcbinfo.last_pcb = 0; - dummy_tcb.t_state = TCP_NSTATES; - dummy_tcb.t_flags = 0; - tcbinfo.dummy_cb = (caddr_t) &dummy_tcb; - in_pcb_nat_init(&tcbinfo, AF_INET, IPPROTO_TCP, SOCK_STREAM); + if ((pcbinfo->mtx = lck_rw_alloc_init(pcbinfo->mtx_grp, pcbinfo->mtx_attr)) == NULL) { + printf("tcp_init: mutex not alloced!\n"); + return; /* pretty much dead if this fails... */ + } - delack_bitmask = _MALLOC((4 * hashsize)/32, M_PCB, M_NOWAIT); + delack_bitmask = _MALLOC((4 * tcp_tcbhashsize)/32, M_PCB, M_WAITOK); if (delack_bitmask == 0) panic("Delack Memory"); @@ -251,57 +367,87 @@ tcp_init() for (i=0; i < N_TIME_WAIT_SLOTS; i++) { LIST_INIT(&time_wait_slots[i]); } -#undef TCP_LGHDR + + timeout(tcp_fasttimo, NULL, hz/TCP_RETRANSHZ); } /* - * Create template to be used to send tcp packets on a connection. - * Call after host entry created, allocates an mbuf and fills - * in a skeletal tcp/ip header, minimizing the amount of work - * necessary when the connection is used. + * Fill in the IP and TCP headers for an outgoing packet, given the tcpcb. + * tcp_template used to store this data in mbufs, but we now recopy it out + * of the tcpcb each time to conserve mbufs. */ -struct tcptemp * -tcp_template(tp) +void +tcp_fillheaders(tp, ip_ptr, tcp_ptr) struct tcpcb *tp; + void *ip_ptr; + void *tcp_ptr; { - register struct inpcb *inp = tp->t_inpcb; - register struct mbuf *m; - register struct tcptemp *n; + struct inpcb *inp = tp->t_inpcb; + struct tcphdr *tcp_hdr = (struct tcphdr *)tcp_ptr; - if ((n = tp->t_template) == 0) { - m = m_get(M_DONTWAIT, MT_HEADER); - if (m == NULL) - return (0); - m->m_len = sizeof (struct tcptemp); - n = mtod(m, struct tcptemp *); - } - bzero(n->tt_x1, sizeof(n->tt_x1)); - n->tt_pr = IPPROTO_TCP; - n->tt_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip)); - n->tt_src = inp->inp_laddr; - n->tt_dst = inp->inp_faddr; - n->tt_sport = inp->inp_lport; - n->tt_dport = inp->inp_fport; - n->tt_seq = 0; - n->tt_ack = 0; - n->tt_x2 = 0; - n->tt_off = 5; - n->tt_flags = 0; - n->tt_win = 0; - n->tt_sum = 0; - n->tt_urp = 0; #if INET6 - n->tt_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; - if (ip6_auto_flowlabel) { - n->tt_flow &= ~IPV6_FLOWLABEL_MASK; - n->tt_flow |= (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); + if ((inp->inp_vflag & INP_IPV6) != 0) { + struct ip6_hdr *ip6; + + ip6 = (struct ip6_hdr *)ip_ptr; + ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | + (inp->in6p_flowinfo & IPV6_FLOWINFO_MASK); + ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | + (IPV6_VERSION & IPV6_VERSION_MASK); + ip6->ip6_nxt = IPPROTO_TCP; + ip6->ip6_plen = sizeof(struct tcphdr); + ip6->ip6_src = inp->in6p_laddr; + ip6->ip6_dst = inp->in6p_faddr; + tcp_hdr->th_sum = 0; + } else +#endif + { + struct ip *ip = (struct ip *) ip_ptr; + + ip->ip_vhl = IP_VHL_BORING; + ip->ip_tos = 0; + ip->ip_len = 0; + ip->ip_id = 0; + ip->ip_off = 0; + ip->ip_ttl = 0; + ip->ip_sum = 0; + ip->ip_p = IPPROTO_TCP; + ip->ip_src = inp->inp_laddr; + ip->ip_dst = inp->inp_faddr; + tcp_hdr->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, + htons(sizeof(struct tcphdr) + IPPROTO_TCP)); } - n->tt_vfc |= IPV6_VERSION; - n->tt_pr6 = IPPROTO_TCP; - n->tt_len6 = n->tt_len; - n->tt_src6 = inp->in6p_laddr; - n->tt_dst6 = inp->in6p_faddr; -#endif /* INET6 */ + + tcp_hdr->th_sport = inp->inp_lport; + tcp_hdr->th_dport = inp->inp_fport; + tcp_hdr->th_seq = 0; + tcp_hdr->th_ack = 0; + tcp_hdr->th_x2 = 0; + tcp_hdr->th_off = 5; + tcp_hdr->th_flags = 0; + tcp_hdr->th_win = 0; + tcp_hdr->th_urp = 0; +} + +/* + * Create template to be used to send tcp packets on a connection. + * Allocates an mbuf and fills in a skeletal tcp/ip header. The only + * use for this function is in keepalives, which use tcp_respond. + */ +struct tcptemp * +tcp_maketemplate(tp) + struct tcpcb *tp; +{ + struct mbuf *m; + struct tcptemp *n; + + m = m_get(M_DONTWAIT, MT_HEADER); + if (m == NULL) + return (0); + m->m_len = sizeof(struct tcptemp); + n = mtod(m, struct tcptemp *); + + tcp_fillheaders(tp, (void *)&n->tt_ipgen, (void *)&n->tt_t); return (n); } @@ -310,10 +456,9 @@ tcp_template(tp) * the given TCP/IP header. If m == 0, then we make a copy * of the tcpiphdr at ti and send directly to the addressed host. * This is used to force keep alive messages out using the TCP - * template for a connection tp->t_template. If flags are given - * then we send a message back to the TCP which originated the - * segment ti, and discard the mbuf containing it and any other - * attached mbufs. + * template for a connection. If flags are given then we send + * a message back to the TCP which originated the * segment ti, + * and discard the mbuf containing it and any other attached mbufs. * * In any case the ack and sequence number of the transmitted * segment are as specified by the parameters. @@ -321,34 +466,42 @@ tcp_template(tp) * NOTE: If m != NULL, then ti must point to *inside* the mbuf. */ void -tcp_respond(tp, iph, th, m, ack, seq, flags, isipv6) - struct tcpcb *tp; - void *iph; - register struct tcphdr *th; - register struct mbuf *m; - tcp_seq ack, seq; - int flags; -#if INET6 - int isipv6; -#endif +tcp_respond( + struct tcpcb *tp, + void *ipgen, + register struct tcphdr *th, + register struct mbuf *m, + tcp_seq ack, + tcp_seq seq, + int flags, + unsigned int ifscope + ) { register int tlen; int win = 0; struct route *ro = 0; struct route sro; - struct ip *ip = iph; - struct tcpiphdr *ti = iph; + struct ip *ip; struct tcphdr *nth; #if INET6 struct route_in6 *ro6 = 0; struct route_in6 sro6; - struct ip6_hdr *ip6 = iph; - struct tcpip6hdr *ti6 = iph; + struct ip6_hdr *ip6; + int isipv6; +#endif /* INET6 */ + +#if INET6 + isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6; + ip6 = ipgen; #endif /* INET6 */ + ip = ipgen; if (tp) { - if (!(flags & TH_RST)) - win = sbspace(&tp->t_inpcb->inp_socket->so_rcv); + if (!(flags & TH_RST)) { + win = tcp_sbspace(tp); + if (win > (int32_t)TCP_MAXWIN << tp->rcv_scale) + win = (int32_t)TCP_MAXWIN << tp->rcv_scale; + } #if INET6 if (isipv6) ro6 = &tp->t_inpcb->in6p_route; @@ -360,76 +513,94 @@ tcp_respond(tp, iph, th, m, ack, seq, flags, isipv6) if (isipv6) { ro6 = &sro6; bzero(ro6, sizeof *ro6); - } else { + } else #endif /* INET6 */ - ro = &sro; - bzero(ro, sizeof *ro); -#if INET6 + { + ro = &sro; + bzero(ro, sizeof *ro); } -#endif /* INET6 */ } if (m == 0) { - m = m_gethdr(M_DONTWAIT, MT_HEADER); + m = m_gethdr(M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (m == NULL) return; -#if TCP_COMPAT_42 - tlen = 1; -#else tlen = 0; -#endif m->m_data += max_linkhdr; #if INET6 if (isipv6) { - ti6 = mtod(m, struct tcpip6hdr *); - bcopy((caddr_t)ip6, (caddr_t)&ti6->ti6_i, + bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(struct ip6_hdr)); - ip6 = &ti6->ti6_i; - nth = &ti6->ti6_t; - } else { + ip6 = mtod(m, struct ip6_hdr *); + nth = (struct tcphdr *)(ip6 + 1); + } else #endif /* INET6 */ - ti = mtod(m, struct tcpiphdr *); - bcopy((caddr_t)ip, (caddr_t)&ti->ti_i, sizeof(struct ip)); - ip = (struct ip *)&ti->ti_i; - nth = &ti->ti_t; -#if INET6 + { + bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); + ip = mtod(m, struct ip *); + nth = (struct tcphdr *)(ip + 1); } -#endif /* INET6 */ bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr)); flags = TH_ACK; } else { m_freem(m->m_next); m->m_next = 0; - m->m_data = (caddr_t)ti; + m->m_data = (caddr_t)ipgen; /* m_len is set later */ tlen = 0; #define xchg(a,b,type) { type t; t=a; a=b; b=t; } #if INET6 if (isipv6) { - struct in6_addr t; - - t = ip6->ip6_dst; - ip6->ip6_dst = ip6->ip6_src; - ip6->ip6_src = t; + xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr); nth = (struct tcphdr *)(ip6 + 1); - if (th != nth) { - /* - * this is the case if an extension header - * exists between the IPv6 header and the - * TCP header. - */ - nth->th_sport = th->th_sport; - nth->th_dport = th->th_dport; - } - } else { + } else #endif /* INET6 */ - xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, n_long); - nth = th; -#if INET6 + { + xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, n_long); + nth = (struct tcphdr *)(ip + 1); + } + if (th != nth) { + /* + * this is usually a case when an extension header + * exists between the IPv6 header and the + * TCP header. + */ + nth->th_sport = th->th_sport; + nth->th_dport = th->th_dport; } -#endif /* INET6 */ xchg(nth->th_dport, nth->th_sport, n_short); #undef xchg } +#if INET6 + if (isipv6) { + ip6->ip6_plen = htons((u_short)(sizeof (struct tcphdr) + + tlen)); + tlen += sizeof (struct ip6_hdr) + sizeof (struct tcphdr); + } else +#endif + { + tlen += sizeof (struct tcpiphdr); + ip->ip_len = tlen; + ip->ip_ttl = ip_defttl; + } + m->m_len = tlen; + m->m_pkthdr.len = tlen; + m->m_pkthdr.rcvif = 0; +#if CONFIG_MACF_NET + if (tp != NULL && tp->t_inpcb != NULL) { + /* + * Packet is associated with a socket, so allow the + * label of the response to reflect the socket label. + */ + mac_mbuf_label_associate_inpcb(tp->t_inpcb, m); + } else { + /* + * Packet is not associated with a socket, so possibly + * update the label in place. + */ + mac_netinet_tcp_reply(m); + } +#endif + nth->th_seq = htonl(seq); nth->th_ack = htonl(ack); nth->th_x2 = 0; @@ -440,65 +611,66 @@ tcp_respond(tp, iph, th, m, ack, seq, flags, isipv6) else nth->th_win = htons((u_short)win); nth->th_urp = 0; - nth->th_sum = 0; - tlen += sizeof (struct tcphdr); #if INET6 if (isipv6) { - m->m_len = tlen + sizeof(struct ip6_hdr); - m->m_pkthdr.len = tlen + sizeof(struct ip6_hdr); - m->m_pkthdr.rcvif = (struct ifnet *) 0; - ip6->ip6_plen = htons((u_short)tlen); - ip6->ip6_nxt = IPPROTO_TCP; + nth->th_sum = 0; + nth->th_sum = in6_cksum(m, IPPROTO_TCP, + sizeof(struct ip6_hdr), + tlen - sizeof(struct ip6_hdr)); ip6->ip6_hlim = in6_selecthlim(tp ? tp->t_inpcb : NULL, ro6 && ro6->ro_rt ? ro6->ro_rt->rt_ifp : NULL); - nth->th_sum = in6_cksum(m, IPPROTO_TCP, - sizeof(struct ip6_hdr), tlen); - ip6->ip6_flow &= ~IPV6_FLOWLABEL_MASK; - if (ip6_auto_flowlabel) { - ip6->ip6_flow |= - (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); - } - } else { + } else #endif /* INET6 */ - ti->ti_len = htons((u_short)(tlen)); - m->m_len = tlen + sizeof(struct ip); - m->m_pkthdr.len = tlen + sizeof(struct ip); - m->m_pkthdr.rcvif = (struct ifnet *) 0; - bzero(ti->ti_x1, sizeof(ti->ti_x1)); - nth->th_sum = in_cksum(m, tlen + sizeof(struct ip)); - ip->ip_len = tlen + sizeof (struct ip); - ip->ip_ttl = ip_defttl; -#if INET6 + { + nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, + htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p))); + m->m_pkthdr.csum_flags = CSUM_TCP; + m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); } -#endif /* INET6 */ #if TCPDEBUG if (tp == NULL || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)) - tcp_trace(TA_OUTPUT, 0, tp, -#if INET6 - isipv6 ? (void *)ip6 : -#endif /* INET6 */ - ip, - nth, 0); + tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0); #endif #if IPSEC - ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL); -#endif /*IPSEC*/ + if (ipsec_bypass == 0 && ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL) != 0) { + m_freem(m); + return; + } +#endif +#if PKT_PRIORITY + if (tp != NULL && soisbackground(tp->t_inpcb->inp_socket)) + m_prio_background(m); +#endif /* PKT_PRIORITY */ #if INET6 if (isipv6) { - (void)ip6_output(m, NULL, ro6, 0, NULL, NULL); - if (ro6 == &sro6 && ro6->ro_rt) - RTFREE(ro6->ro_rt); - } else { + (void)ip6_output(m, NULL, ro6, 0, NULL, NULL, 0); + if (ro6 == &sro6 && ro6->ro_rt) { + rtfree(ro6->ro_rt); + ro6->ro_rt = NULL; + } + } else #endif /* INET6 */ - (void)ip_output(m, NULL, ro, 0, NULL); - if (ro == &sro && ro->ro_rt) { - RTFREE(ro->ro_rt); - } -#if INET6 + { + struct ip_out_args ipoa = { ifscope }; + + if (ro != &sro) { + /* Copy the cached route and take an extra reference */ + inp_route_copyout(tp->t_inpcb, &sro); + } + /* + * For consistency, pass a local route copy. + */ + (void) ip_output(m, NULL, &sro, IP_OUTARGS, NULL, &ipoa); + + if (ro != &sro) { + /* Synchronize cached PCB route */ + inp_route_copyin(tp->t_inpcb, &sro); + } else if (sro.ro_rt != NULL) { + rtfree(sro.ro_rt); + } } -#endif /* INET6 */ } /* @@ -515,10 +687,9 @@ tcp_newtcpcb(inp) register struct tcpcb *tp; register struct socket *so = inp->inp_socket; #if INET6 - int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; + int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; #endif /* INET6 */ - if (so->cached_in_sock_layer == 0) { it = (struct inp_tp *)inp; tp = &it->tcb; @@ -527,18 +698,17 @@ tcp_newtcpcb(inp) tp = (struct tcpcb *) inp->inp_saved_ppcb; bzero((char *) tp, sizeof(struct tcpcb)); - tp->segq.lh_first = NULL; - tp->t_maxseg = tp->t_maxopd = + LIST_INIT(&tp->t_segq); + tp->t_maxseg = tp->t_maxopd = #if INET6 - isipv6 ? tcp_v6mssdflt : + isipv6 ? tcp_v6mssdflt : #endif /* INET6 */ - tcp_mssdflt; - + tcp_mssdflt; if (tcp_do_rfc1323) tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP); - if (tcp_do_rfc1644) - tp->t_flags |= TF_REQ_CC; + tp->sack_enable = tcp_do_sack; + TAILQ_INIT(&tp->snd_holes); tp->t_inpcb = inp; /* XXX */ /* * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no @@ -547,15 +717,18 @@ tcp_newtcpcb(inp) */ tp->t_srtt = TCPTV_SRTTBASE; tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4; - tp->t_rttmin = TCPTV_MIN; + tp->t_rttmin = tcp_TCPTV_MIN; tp->t_rxtcur = TCPTV_RTOBASE; tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; + tp->snd_bwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT; + tp->snd_ssthresh_prev = TCP_MAXWIN << TCP_MAX_WINSHIFT; + tp->t_rcvtime = 0; + tp->t_bw_rtttime = 0; /* * IPv4 TTL initialization is necessary for an IPv6 socket as well, * because the socket may be bound to an IPv6 wildcard address, * which may match an IPv4-mapped IPv6 address. - * XXX: is there a better approach? */ inp->inp_ip_ttl = ip_defttl; inp->inp_ppcb = (caddr_t)tp; @@ -573,18 +746,7 @@ tcp_drop(tp, errno) int errno; { struct socket *so = tp->t_inpcb->inp_socket; - - switch (tp->t_state) - { - case TCPS_ESTABLISHED: - case TCPS_FIN_WAIT_1: - case TCPS_CLOSING: - case TCPS_CLOSE_WAIT: - case TCPS_LAST_ACK: - current_active_connections--; - break; - } - + if (TCPS_HAVERCVDSYN(tp->t_state)) { tp->t_state = TCPS_CLOSED; (void) tcp_output(tp); @@ -607,16 +769,24 @@ struct tcpcb * tcp_close(tp) register struct tcpcb *tp; { - register struct mbuf *q; - register struct mbuf *nq; struct inpcb *inp = tp->t_inpcb; struct socket *so = inp->inp_socket; #if INET6 - int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6); + int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; #endif /* INET6 */ - register struct rtentry *rt; + struct rtentry *rt; int dosavessthresh; + if ( inp->inp_ppcb == NULL) /* tcp_close was called previously, bail */ + return NULL; + + /* Clear the timers before we delete the PCB. */ + { + int i; + for (i = 0; i < TCPT_NTIMERS; i++) { + tp->t_timer[i] = 0; + } + } KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_START, tp,0,0,0,0); switch (tp->t_state) @@ -626,10 +796,33 @@ tcp_close(tp) case TCPS_CLOSING: case TCPS_CLOSE_WAIT: case TCPS_LAST_ACK: - current_active_connections--; break; } + /* + * If another thread for this tcp is currently in ip (indicated by + * the TF_SENDINPROG flag), defer the cleanup until after it returns + * back to tcp. This is done to serialize the close until after all + * pending output is finished, in order to avoid having the PCB be + * detached and the cached route cleaned, only for ip to cache the + * route back into the PCB again. Note that we've cleared all the + * timers at this point. Set TF_CLOSING to indicate to tcp_output() + * that is should call us again once it returns from ip; at that + * point both flags should be cleared and we can proceed further + * with the cleanup. + */ + if (tp->t_flags & (TF_CLOSING|TF_SENDINPROG)) { + tp->t_flags |= TF_CLOSING; + return (NULL); + } + +#if INET6 + rt = isipv6 ? inp->in6p_route.ro_rt : inp->inp_route.ro_rt; +#else + rt = inp->inp_route.ro_rt; +#endif + if (rt != NULL) + RT_LOCK_SPIN(rt); /* * If we got enough samples through the srtt filter, @@ -643,27 +836,32 @@ tcp_close(tp) * update anything that the user "locked". */ if (tp->t_rttupdated >= 16) { - register u_long i = 0; + register u_int32_t i = 0; + #if INET6 if (isipv6) { struct sockaddr_in6 *sin6; - if ((rt = inp->in6p_route.ro_rt) == NULL) + if (rt == NULL) goto no_valid_rt; sin6 = (struct sockaddr_in6 *)rt_key(rt); if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) goto no_valid_rt; } else -#endif /* INET6 */ - if ((rt = inp->inp_route.ro_rt) == NULL || - ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr - == INADDR_ANY) +#endif /* INET6 */ + if (rt == NULL || !(rt->rt_flags & RTF_UP) || + ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr == + INADDR_ANY || rt->generation_id != route_generation) { + if (tp->t_state >= TCPS_CLOSE_WAIT) + tp->t_state = TCPS_CLOSING; goto no_valid_rt; + } + RT_LOCK_ASSERT_HELD(rt); if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) { i = tp->t_srtt * - (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTT_SCALE)); + (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTT_SCALE)); if (rt->rt_rmx.rmx_rtt && i) /* * filter this update to half the old & half @@ -679,7 +877,7 @@ tcp_close(tp) } if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) { i = tp->t_rttvar * - (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTTVAR_SCALE)); + (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTTVAR_SCALE)); if (rt->rt_rmx.rmx_rttvar && i) rt->rt_rmx.rmx_rttvar = (rt->rt_rmx.rmx_rttvar + i) / 2; @@ -716,11 +914,16 @@ tcp_close(tp) i = (i + tp->t_maxseg / 2) / tp->t_maxseg; if (i < 2) i = 2; - i *= (u_long)(tp->t_maxseg + + i *= (u_int32_t)(tp->t_maxseg + #if INET6 - isipv6 ? sizeof (struct tcpip6hdr) : -#endif /* INET6 */ - sizeof (struct tcpiphdr)); + (isipv6 ? sizeof (struct ip6_hdr) + + sizeof (struct tcphdr) : +#endif + sizeof (struct tcpiphdr) +#if INET6 + ) +#endif + ); if (rt->rt_rmx.rmx_ssthresh) rt->rt_rmx.rmx_ssthresh = (rt->rt_rmx.rmx_ssthresh + i) / 2; @@ -729,20 +932,39 @@ tcp_close(tp) tcpstat.tcps_cachedssthresh++; } } - no_valid_rt: + + /* + * Mark route for deletion if no information is cached. + */ + if (rt != NULL && (so->so_flags & SOF_OVERFLOW) && tcp_lq_overflow) { + if (!(rt->rt_rmx.rmx_locks & RTV_RTT) && + rt->rt_rmx.rmx_rtt == 0) { + rt->rt_flags |= RTF_DELCLONE; + } + } + +no_valid_rt: + if (rt != NULL) + RT_UNLOCK(rt); + /* free the reassembly queue, if any */ (void) tcp_freeq(tp); - if (tp->t_template) - (void) m_free(dtom(tp->t_template)); + tcp_free_sackholes(tp); + + /* Free the packet list */ + if (tp->t_pktlist_head != NULL) + m_freem_list(tp->t_pktlist_head); + TCP_PKTLIST_CLEAR(tp); +#ifdef __APPLE__ if (so->cached_in_sock_layer) inp->inp_saved_ppcb = (caddr_t) tp; +#endif - inp->inp_ppcb = NULL; soisdisconnected(so); #if INET6 - if (isipv6) + if (INP_CHECK_SOCKAF(so, AF_INET6)) in6_pcbdetach(inp); else #endif /* INET6 */ @@ -756,13 +978,15 @@ int tcp_freeq(tp) struct tcpcb *tp; { - register struct ipqent *qe; + + register struct tseg_qent *q; int rv = 0; - while ((qe = tp->segq.lh_first) != NULL) { - LIST_REMOVE(qe, ipqe_q); - m_freem(qe->ipqe_m); - FREE(qe, M_SONAME); + while((q = LIST_FIRST(&tp->t_segq)) != NULL) { + LIST_REMOVE(q, tqe_q); + m_freem(q->tqe_m); + FREE(q, M_TSEGQ); + tcp_reass_qsize--; rv = 1; } return (rv); @@ -771,21 +995,59 @@ tcp_freeq(tp) void tcp_drain() { + if (do_tcpdrain) + { + struct inpcb *inpb; + struct tcpcb *tcpb; + struct tseg_qent *te; + + /* + * Walk the tcpbs, if existing, and flush the reassembly queue, + * if there is one... + * XXX: The "Net/3" implementation doesn't imply that the TCP + * reassembly queue should be flushed, but in a situation + * where we're really low on mbufs, this is potentially + * usefull. + */ + if (!lck_rw_try_lock_exclusive(tcbinfo.mtx)) /* do it next time if the lock is in use */ + return; + for (inpb = LIST_FIRST(tcbinfo.listhead); inpb; + inpb = LIST_NEXT(inpb, inp_list)) { + if ((tcpb = intotcpcb(inpb))) { + while ((te = LIST_FIRST(&tcpb->t_segq)) + != NULL) { + LIST_REMOVE(te, tqe_q); + m_freem(te->tqe_m); + FREE(te, M_TSEGQ); + tcp_reass_qsize--; + } + } + } + lck_rw_done(tcbinfo.mtx); + + } } /* * Notify a tcp user of an asynchronous error; * store error as soft error, but wake up user * (for now, won't do anything until can select for soft error). + * + * Do not wake up user since there currently is no mechanism for + * reporting soft errors (yet - a kqueue filter may be added). */ static void tcp_notify(inp, error) struct inpcb *inp; int error; { - register struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb; - register struct socket *so = inp->inp_socket; + struct tcpcb *tp; + + if (inp == NULL || (inp->inp_state == INPCB_STATE_DEAD)) + return; /* pcb is gone already */ + + tp = (struct tcpcb *)inp->inp_ppcb; /* * Ignore some errors if we are hooked up. @@ -800,75 +1062,177 @@ tcp_notify(inp, error) return; } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 && tp->t_softerror) - so->so_error = error; + tcp_drop(tp, error); else tp->t_softerror = error; +#if 0 wakeup((caddr_t) &so->so_timeo); sorwakeup(so); sowwakeup(so); +#endif } +/* + * tcpcb_to_otcpcb copies specific bits of a tcpcb to a otcpcb format. + * The otcpcb data structure is passed to user space and must not change. + */ +static void +tcpcb_to_otcpcb(struct tcpcb *tp, struct otcpcb *otp) +{ + int i; + + otp->t_segq = (u_int32_t)(uintptr_t)tp->t_segq.lh_first; + otp->t_dupacks = tp->t_dupacks; + for (i = 0; i < TCPT_NTIMERS; i++) + otp->t_timer[i] = tp->t_timer[i]; + otp->t_inpcb = (_TCPCB_PTR(struct inpcb *))(uintptr_t)tp->t_inpcb; + otp->t_state = tp->t_state; + otp->t_flags = tp->t_flags; + otp->t_force = tp->t_force; + otp->snd_una = tp->snd_una; + otp->snd_max = tp->snd_max; + otp->snd_nxt = tp->snd_nxt; + otp->snd_up = tp->snd_up; + otp->snd_wl1 = tp->snd_wl1; + otp->snd_wl2 = tp->snd_wl2; + otp->iss = tp->iss; + otp->irs = tp->irs; + otp->rcv_nxt = tp->rcv_nxt; + otp->rcv_adv = tp->rcv_adv; + otp->rcv_wnd = tp->rcv_wnd; + otp->rcv_up = tp->rcv_up; + otp->snd_wnd = tp->snd_wnd; + otp->snd_cwnd = tp->snd_cwnd; + otp->snd_ssthresh = tp->snd_ssthresh; + otp->t_maxopd = tp->t_maxopd; + otp->t_rcvtime = tp->t_rcvtime; + otp->t_starttime = tp->t_starttime; + otp->t_rtttime = tp->t_rtttime; + otp->t_rtseq = tp->t_rtseq; + otp->t_rxtcur = tp->t_rxtcur; + otp->t_maxseg = tp->t_maxseg; + otp->t_srtt = tp->t_srtt; + otp->t_rttvar = tp->t_rttvar; + otp->t_rxtshift = tp->t_rxtshift; + otp->t_rttmin = tp->t_rttmin; + otp->t_rttupdated = tp->t_rttupdated; + otp->max_sndwnd = tp->max_sndwnd; + otp->t_softerror = tp->t_softerror; + otp->t_oobflags = tp->t_oobflags; + otp->t_iobc = tp->t_iobc; + otp->snd_scale = tp->snd_scale; + otp->rcv_scale = tp->rcv_scale; + otp->request_r_scale = tp->request_r_scale; + otp->requested_s_scale = tp->requested_s_scale; + otp->ts_recent = tp->ts_recent; + otp->ts_recent_age = tp->ts_recent_age; + otp->last_ack_sent = tp->last_ack_sent; + otp->cc_send = tp->cc_send; + otp->cc_recv = tp->cc_recv; + otp->snd_recover = tp->snd_recover; + otp->snd_cwnd_prev = tp->snd_cwnd_prev; + otp->snd_ssthresh_prev = tp->snd_ssthresh_prev; + otp->t_badrxtwin = tp->t_badrxtwin; +} static int tcp_pcblist SYSCTL_HANDLER_ARGS { - int error, i, n, s; +#pragma unused(oidp, arg1, arg2) + int error, i, n; struct inpcb *inp, **inp_list; inp_gen_t gencnt; struct xinpgen xig; + int slot; /* * The process of preparing the TCB list is too time-consuming and * resource-intensive to repeat twice on every request. */ - if (req->oldptr == 0) { + lck_rw_lock_shared(tcbinfo.mtx); + if (req->oldptr == USER_ADDR_NULL) { n = tcbinfo.ipi_count; req->oldidx = 2 * (sizeof xig) + (n + n/8) * sizeof(struct xtcpcb); + lck_rw_done(tcbinfo.mtx); return 0; } - if (req->newptr != 0) + if (req->newptr != USER_ADDR_NULL) { + lck_rw_done(tcbinfo.mtx); return EPERM; + } /* * OK, now we're committed to doing something. */ - s = splnet(); gencnt = tcbinfo.ipi_gencnt; n = tcbinfo.ipi_count; - splx(s); + bzero(&xig, sizeof(xig)); xig.xig_len = sizeof xig; xig.xig_count = n; xig.xig_gen = gencnt; xig.xig_sogen = so_gencnt; error = SYSCTL_OUT(req, &xig, sizeof xig); - if (error) + if (error) { + lck_rw_done(tcbinfo.mtx); return error; + } + /* + * We are done if there is no pcb + */ + if (n == 0) { + lck_rw_done(tcbinfo.mtx); + return 0; + } inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK); - if (inp_list == 0) + if (inp_list == 0) { + lck_rw_done(tcbinfo.mtx); return ENOMEM; + } - s = splnet(); - for (inp = tcbinfo.listhead->lh_first, i = 0; inp && i < n; - inp = inp->inp_list.le_next) { - if (inp->inp_gencnt <= gencnt) + for (inp = LIST_FIRST(tcbinfo.listhead), i = 0; inp && i < n; + inp = LIST_NEXT(inp, inp_list)) { +#ifdef __APPLE__ + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) +#else + if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) +#endif inp_list[i++] = inp; } - splx(s); + + for (slot = 0; slot < N_TIME_WAIT_SLOTS; slot++) { + struct inpcb *inpnxt; + + for (inp = time_wait_slots[slot].lh_first; inp && i < n; inp = inpnxt) { + inpnxt = inp->inp_list.le_next; + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) + inp_list[i++] = inp; + } + } + n = i; error = 0; for (i = 0; i < n; i++) { inp = inp_list[i]; - if (inp->inp_gencnt <= gencnt) { + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) { struct xtcpcb xt; + caddr_t inp_ppcb; + + bzero(&xt, sizeof(xt)); xt.xt_len = sizeof xt; /* XXX should avoid extra copy */ - bcopy(inp, &xt.xt_inp, sizeof *inp); - bcopy(inp->inp_ppcb, &xt.xt_tp, sizeof xt.xt_tp); + inpcb_to_compat(inp, &xt.xt_inp); + inp_ppcb = inp->inp_ppcb; + if (inp_ppcb != NULL) { + tcpcb_to_otcpcb((struct tcpcb *)inp_ppcb, + &xt.xt_tp); + } else { + bzero((char *) &xt.xt_tp, sizeof xt.xt_tp); + } if (inp->inp_socket) sotoxsocket(inp->inp_socket, &xt.xt_socket); error = SYSCTL_OUT(req, &xt, sizeof xt); @@ -882,45 +1246,315 @@ tcp_pcblist SYSCTL_HANDLER_ARGS * while we were processing this request, and it * might be necessary to retry. */ - s = splnet(); + bzero(&xig, sizeof(xig)); + xig.xig_len = sizeof xig; xig.xig_gen = tcbinfo.ipi_gencnt; xig.xig_sogen = so_gencnt; xig.xig_count = tcbinfo.ipi_count; - splx(s); error = SYSCTL_OUT(req, &xig, sizeof xig); } FREE(inp_list, M_TEMP); + lck_rw_done(tcbinfo.mtx); return error; } - SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, tcp_pcblist, "S,xtcpcb", "List of active TCP connections"); +#if !CONFIG_EMBEDDED + +static void +tcpcb_to_xtcpcb64(struct tcpcb *tp, struct xtcpcb64 *otp) +{ + int i; + + otp->t_segq = (u_int32_t)(uintptr_t)tp->t_segq.lh_first; + otp->t_dupacks = tp->t_dupacks; + for (i = 0; i < TCPT_NTIMERS; i++) + otp->t_timer[i] = tp->t_timer[i]; + otp->t_state = tp->t_state; + otp->t_flags = tp->t_flags; + otp->t_force = tp->t_force; + otp->snd_una = tp->snd_una; + otp->snd_max = tp->snd_max; + otp->snd_nxt = tp->snd_nxt; + otp->snd_up = tp->snd_up; + otp->snd_wl1 = tp->snd_wl1; + otp->snd_wl2 = tp->snd_wl2; + otp->iss = tp->iss; + otp->irs = tp->irs; + otp->rcv_nxt = tp->rcv_nxt; + otp->rcv_adv = tp->rcv_adv; + otp->rcv_wnd = tp->rcv_wnd; + otp->rcv_up = tp->rcv_up; + otp->snd_wnd = tp->snd_wnd; + otp->snd_cwnd = tp->snd_cwnd; + otp->snd_ssthresh = tp->snd_ssthresh; + otp->t_maxopd = tp->t_maxopd; + otp->t_rcvtime = tp->t_rcvtime; + otp->t_starttime = tp->t_starttime; + otp->t_rtttime = tp->t_rtttime; + otp->t_rtseq = tp->t_rtseq; + otp->t_rxtcur = tp->t_rxtcur; + otp->t_maxseg = tp->t_maxseg; + otp->t_srtt = tp->t_srtt; + otp->t_rttvar = tp->t_rttvar; + otp->t_rxtshift = tp->t_rxtshift; + otp->t_rttmin = tp->t_rttmin; + otp->t_rttupdated = tp->t_rttupdated; + otp->max_sndwnd = tp->max_sndwnd; + otp->t_softerror = tp->t_softerror; + otp->t_oobflags = tp->t_oobflags; + otp->t_iobc = tp->t_iobc; + otp->snd_scale = tp->snd_scale; + otp->rcv_scale = tp->rcv_scale; + otp->request_r_scale = tp->request_r_scale; + otp->requested_s_scale = tp->requested_s_scale; + otp->ts_recent = tp->ts_recent; + otp->ts_recent_age = tp->ts_recent_age; + otp->last_ack_sent = tp->last_ack_sent; + otp->cc_send = tp->cc_send; + otp->cc_recv = tp->cc_recv; + otp->snd_recover = tp->snd_recover; + otp->snd_cwnd_prev = tp->snd_cwnd_prev; + otp->snd_ssthresh_prev = tp->snd_ssthresh_prev; + otp->t_badrxtwin = tp->t_badrxtwin; +} + + +static int +tcp_pcblist64 SYSCTL_HANDLER_ARGS +{ +#pragma unused(oidp, arg1, arg2) + int error, i, n; + struct inpcb *inp, **inp_list; + inp_gen_t gencnt; + struct xinpgen xig; + int slot; + + /* + * The process of preparing the TCB list is too time-consuming and + * resource-intensive to repeat twice on every request. + */ + lck_rw_lock_shared(tcbinfo.mtx); + if (req->oldptr == USER_ADDR_NULL) { + n = tcbinfo.ipi_count; + req->oldidx = 2 * (sizeof xig) + + (n + n/8) * sizeof(struct xtcpcb64); + lck_rw_done(tcbinfo.mtx); + return 0; + } + + if (req->newptr != USER_ADDR_NULL) { + lck_rw_done(tcbinfo.mtx); + return EPERM; + } + + /* + * OK, now we're committed to doing something. + */ + gencnt = tcbinfo.ipi_gencnt; + n = tcbinfo.ipi_count; + + bzero(&xig, sizeof(xig)); + xig.xig_len = sizeof xig; + xig.xig_count = n; + xig.xig_gen = gencnt; + xig.xig_sogen = so_gencnt; + error = SYSCTL_OUT(req, &xig, sizeof xig); + if (error) { + lck_rw_done(tcbinfo.mtx); + return error; + } + /* + * We are done if there is no pcb + */ + if (n == 0) { + lck_rw_done(tcbinfo.mtx); + return 0; + } + + inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK); + if (inp_list == 0) { + lck_rw_done(tcbinfo.mtx); + return ENOMEM; + } + + for (inp = LIST_FIRST(tcbinfo.listhead), i = 0; inp && i < n; + inp = LIST_NEXT(inp, inp_list)) { +#ifdef __APPLE__ + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) +#else + if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) +#endif + inp_list[i++] = inp; + } + + for (slot = 0; slot < N_TIME_WAIT_SLOTS; slot++) { + struct inpcb *inpnxt; + + for (inp = time_wait_slots[slot].lh_first; inp && i < n; inp = inpnxt) { + inpnxt = inp->inp_list.le_next; + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) + inp_list[i++] = inp; + } + } + + n = i; + + error = 0; + for (i = 0; i < n; i++) { + inp = inp_list[i]; + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) { + struct xtcpcb64 xt; + + bzero(&xt, sizeof(xt)); + xt.xt_len = sizeof xt; + inpcb_to_xinpcb64(inp, &xt.xt_inpcb); + xt.xt_inpcb.inp_ppcb = (u_int64_t)(uintptr_t)inp->inp_ppcb; + if (inp->inp_ppcb != NULL) + tcpcb_to_xtcpcb64((struct tcpcb *)inp->inp_ppcb, &xt); + if (inp->inp_socket) + sotoxsocket64(inp->inp_socket, &xt.xt_inpcb.xi_socket); + error = SYSCTL_OUT(req, &xt, sizeof xt); + } + } + if (!error) { + /* + * Give the user an updated idea of our state. + * If the generation differs from what we told + * her before, she knows that something happened + * while we were processing this request, and it + * might be necessary to retry. + */ + bzero(&xig, sizeof(xig)); + xig.xig_len = sizeof xig; + xig.xig_gen = tcbinfo.ipi_gencnt; + xig.xig_sogen = so_gencnt; + xig.xig_count = tcbinfo.ipi_count; + error = SYSCTL_OUT(req, &xig, sizeof xig); + } + FREE(inp_list, M_TEMP); + lck_rw_done(tcbinfo.mtx); + return error; +} + +SYSCTL_PROC(_net_inet_tcp, OID_AUTO, pcblist64, CTLFLAG_RD, 0, 0, + tcp_pcblist64, "S,xtcpcb64", "List of active TCP connections"); + +#endif /* !CONFIG_EMBEDDED */ + void tcp_ctlinput(cmd, sa, vip) int cmd; struct sockaddr *sa; void *vip; { - register struct ip *ip = vip; - register struct tcphdr *th; - void (*notify) __P((struct inpcb *, int)) = tcp_notify; + tcp_seq icmp_tcp_seq; + struct ip *ip = vip; + struct tcphdr *th; + struct in_addr faddr; + struct inpcb *inp; + struct tcpcb *tp; + + void (*notify)(struct inpcb *, int) = tcp_notify; + + struct icmp *icp; - if (cmd == PRC_QUENCH) - notify = tcp_quench; - else if (cmd == PRC_MSGSIZE) + faddr = ((struct sockaddr_in *)sa)->sin_addr; + if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) + return; + + if (cmd == PRC_MSGSIZE) notify = tcp_mtudisc; - else if (!PRC_IS_REDIRECT(cmd) && - ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)) + else if (icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB || + cmd == PRC_UNREACH_PORT) && ip) + notify = tcp_drop_syn_sent; + else if (PRC_IS_REDIRECT(cmd)) { + ip = 0; + notify = in_rtchange; + } else if (cmd == PRC_HOSTDEAD) + ip = 0; + /* Source quench is deprecated */ + else if (cmd == PRC_QUENCH) + return; + else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0) return; if (ip) { + icp = (struct icmp *)((caddr_t)ip + - offsetof(struct icmp, icmp_ip)); th = (struct tcphdr *)((caddr_t)ip - + (IP_VHL_HL(ip->ip_vhl) << 2)); - in_pcbnotify(&tcb, sa, th->th_dport, ip->ip_src, th->th_sport, - cmd, notify); + + (IP_VHL_HL(ip->ip_vhl) << 2)); + inp = in_pcblookup_hash(&tcbinfo, faddr, th->th_dport, + ip->ip_src, th->th_sport, 0, NULL); + if (inp != NULL && inp->inp_socket != NULL) { + tcp_lock(inp->inp_socket, 1, 0); + if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) { + tcp_unlock(inp->inp_socket, 1, 0); + return; + } + icmp_tcp_seq = htonl(th->th_seq); + tp = intotcpcb(inp); + if (SEQ_GEQ(icmp_tcp_seq, tp->snd_una) && + SEQ_LT(icmp_tcp_seq, tp->snd_max)) { + if (cmd == PRC_MSGSIZE) { + + /* + * MTU discovery: + * If we got a needfrag and there is a host route to the + * original destination, and the MTU is not locked, then + * set the MTU in the route to the suggested new value + * (if given) and then notify as usual. The ULPs will + * notice that the MTU has changed and adapt accordingly. + * If no new MTU was suggested, then we guess a new one + * less than the current value. If the new MTU is + * unreasonably small (defined by sysctl tcp_minmss), then + * we reset the MTU to the interface value and enable the + * lock bit, indicating that we are no longer doing MTU + * discovery. + */ + struct rtentry *rt; + int mtu; + struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET, + 0 , { 0 }, { 0,0,0,0,0,0,0,0 } }; + icmpsrc.sin_addr = icp->icmp_ip.ip_dst; + + rt = rtalloc1((struct sockaddr *)&icmpsrc, 0, + RTF_CLONING | RTF_PRCLONING); + if (rt != NULL) { + RT_LOCK(rt); + if ((rt->rt_flags & RTF_HOST) && + !(rt->rt_rmx.rmx_locks & RTV_MTU)) { + mtu = ntohs(icp->icmp_nextmtu); + if (!mtu) + mtu = ip_next_mtu(rt->rt_rmx. + rmx_mtu, 1); +#if DEBUG_MTUDISC + printf("MTU for %s reduced to %d\n", + inet_ntop(AF_INET, + &icmpsrc.sin_addr, ipv4str, + sizeof (ipv4str)), mtu); +#endif + if (mtu < max(296, (tcp_minmss + + sizeof (struct tcpiphdr)))) { + /* rt->rt_rmx.rmx_mtu = + rt->rt_ifp->if_mtu; */ + rt->rt_rmx.rmx_locks |= RTV_MTU; + } else if (rt->rt_rmx.rmx_mtu > mtu) { + rt->rt_rmx.rmx_mtu = mtu; + } + } + RT_UNLOCK(rt); + rtfree(rt); + } + } + + (*notify)(inp, inetctlerrmap[cmd]); + } + tcp_unlock(inp->inp_socket, 1, 0); + } } else - in_pcbnotify(&tcb, sa, 0, zeroin_addr, 0, cmd, notify); + in_pcbnotifyall(&tcbinfo, faddr, inetctlerrmap[cmd], notify); } #if INET6 @@ -930,85 +1564,188 @@ tcp6_ctlinput(cmd, sa, d) struct sockaddr *sa; void *d; { - register struct tcphdr *thp; struct tcphdr th; - void (*notify) __P((struct inpcb *, int)) = tcp_notify; - struct sockaddr_in6 sa6; + void (*notify)(struct inpcb *, int) = tcp_notify; struct ip6_hdr *ip6; struct mbuf *m; - int off = 0 ; + struct ip6ctlparam *ip6cp = NULL; + const struct sockaddr_in6 *sa6_src = NULL; + int off; + struct tcp_portonly { + u_int16_t th_sport; + u_int16_t th_dport; + } *thp; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) return; - if (cmd == PRC_QUENCH) - notify = tcp_quench; - else if (cmd == PRC_MSGSIZE) + if (cmd == PRC_MSGSIZE) notify = tcp_mtudisc; else if (!PRC_IS_REDIRECT(cmd) && ((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0)) return; + /* Source quench is deprecated */ + else if (cmd == PRC_QUENCH) + return; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { - struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d; + ip6cp = (struct ip6ctlparam *)d; m = ip6cp->ip6c_m; ip6 = ip6cp->ip6c_ip6; off = ip6cp->ip6c_off; + sa6_src = ip6cp->ip6c_src; } else { m = NULL; ip6 = NULL; + off = 0; /* fool gcc */ + sa6_src = &sa6_any; } - /* translate addresses into internal form */ - sa6 = *(struct sockaddr_in6 *)sa; - if (IN6_IS_ADDR_LINKLOCAL(&sa6.sin6_addr) && m && m->m_pkthdr.rcvif) - sa6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); - if (ip6) { /* * XXX: We assume that when IPV6 is non NULL, * M and OFF are valid. */ - struct in6_addr s; - /* translate addresses into internal form */ - memcpy(&s, &ip6->ip6_src, sizeof(s)); - if (IN6_IS_ADDR_LINKLOCAL(&s)) - s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); + /* check if we can safely examine src and dst ports */ + if (m->m_pkthdr.len < off + sizeof(*thp)) + return; + bzero(&th, sizeof(th)); + m_copydata(m, off, sizeof(*thp), (caddr_t)&th); - if (m->m_len < off + sizeof(*thp)) { - /* - * this should be rare case, - * so we compromise on this copy... - */ - m_copydata(m, off, sizeof(th), (caddr_t)&th); - thp = &th; - } else - thp = (struct tcphdr *)(mtod(m, caddr_t) + off); - in6_pcbnotify(&tcb, (struct sockaddr *)&sa6, thp->th_dport, - &s, thp->th_sport, cmd, notify); - } else - in6_pcbnotify(&tcb, (struct sockaddr *)&sa6, 0, &zeroin6_addr, - 0, cmd, notify); + in6_pcbnotify(&tcbinfo, sa, th.th_dport, + (struct sockaddr *)ip6cp->ip6c_src, + th.th_sport, cmd, notify); + } else { + in6_pcbnotify(&tcbinfo, sa, 0, + (struct sockaddr *)(size_t)sa6_src, 0, cmd, notify); + } } #endif /* INET6 */ + +/* + * Following is where TCP initial sequence number generation occurs. + * + * There are two places where we must use initial sequence numbers: + * 1. In SYN-ACK packets. + * 2. In SYN packets. + * + * The ISNs in SYN-ACK packets have no monotonicity requirement, + * and should be as unpredictable as possible to avoid the possibility + * of spoofing and/or connection hijacking. To satisfy this + * requirement, SYN-ACK ISNs are generated via the arc4random() + * function. If exact RFC 1948 compliance is requested via sysctl, + * these ISNs will be generated just like those in SYN packets. + * + * The ISNs in SYN packets must be monotonic; TIME_WAIT recycling + * depends on this property. In addition, these ISNs should be + * unguessable so as to prevent connection hijacking. To satisfy + * the requirements of this situation, the algorithm outlined in + * RFC 1948 is used to generate sequence numbers. + * + * For more information on the theory of operation, please see + * RFC 1948. + * + * Implementation details: + * + * Time is based off the system timer, and is corrected so that it + * increases by one megabyte per second. This allows for proper + * recycling on high speed LANs while still leaving over an hour + * before rollover. + * + * Two sysctls control the generation of ISNs: + * + * net.inet.tcp.isn_reseed_interval controls the number of seconds + * between seeding of isn_secret. This is normally set to zero, + * as reseeding should not be necessary. + * + * net.inet.tcp.strict_rfc1948 controls whether RFC 1948 is followed + * strictly. When strict compliance is requested, reseeding is + * disabled and SYN-ACKs will be generated in the same manner as + * SYNs. Strict mode is disabled by default. + * + */ + +#define ISN_BYTES_PER_SECOND 1048576 + +tcp_seq +tcp_new_isn(tp) + struct tcpcb *tp; +{ + u_int32_t md5_buffer[4]; + tcp_seq new_isn; + struct timeval timenow; + u_char isn_secret[32]; + int isn_last_reseed = 0; + MD5_CTX isn_ctx; + + /* Use arc4random for SYN-ACKs when not in exact RFC1948 mode. */ + if (((tp->t_state == TCPS_LISTEN) || (tp->t_state == TCPS_TIME_WAIT)) + && tcp_strict_rfc1948 == 0) +#ifdef __APPLE__ + return random(); +#else + return arc4random(); +#endif + getmicrotime(&timenow); + + /* Seed if this is the first use, reseed if requested. */ + if ((isn_last_reseed == 0) || + ((tcp_strict_rfc1948 == 0) && (tcp_isn_reseed_interval > 0) && + (((u_int)isn_last_reseed + (u_int)tcp_isn_reseed_interval*hz) + < (u_int)timenow.tv_sec))) { +#ifdef __APPLE__ + read_random(&isn_secret, sizeof(isn_secret)); +#else + read_random_unlimited(&isn_secret, sizeof(isn_secret)); +#endif + isn_last_reseed = timenow.tv_sec; + } + + /* Compute the md5 hash and return the ISN. */ + MD5Init(&isn_ctx); + MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_fport, sizeof(u_short)); + MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_lport, sizeof(u_short)); +#if INET6 + if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) { + MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->in6p_faddr, + sizeof(struct in6_addr)); + MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->in6p_laddr, + sizeof(struct in6_addr)); + } else +#endif + { + MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_faddr, + sizeof(struct in_addr)); + MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_laddr, + sizeof(struct in_addr)); + } + MD5Update(&isn_ctx, (u_char *) &isn_secret, sizeof(isn_secret)); + MD5Final((u_char *) &md5_buffer, &isn_ctx); + new_isn = (tcp_seq) md5_buffer[0]; + new_isn += timenow.tv_sec * (ISN_BYTES_PER_SECOND / hz); + return new_isn; +} + + /* - * When a source quench is received, close congestion window - * to one segment. We will gradually open it again as we proceed. + * When a specific ICMP unreachable message is received and the + * connection state is SYN-SENT, drop the connection. This behavior + * is controlled by the icmp_may_rst sysctl. */ void -tcp_quench(inp, errno) +tcp_drop_syn_sent(inp, errno) struct inpcb *inp; int errno; { struct tcpcb *tp = intotcpcb(inp); - if (tp) - tp->snd_cwnd = tp->t_maxseg; + if (tp && tp->t_state == TCPS_SYN_SENT) + tcp_drop(tp, errno); } /* @@ -1018,9 +1755,10 @@ tcp_quench(inp, errno) * This duplicates some code in the tcp_mss() function in tcp_input.c. */ void -tcp_mtudisc(inp, errno) - struct inpcb *inp; - int errno; +tcp_mtudisc( + struct inpcb *inp, + __unused int errno +) { struct tcpcb *tp = intotcpcb(inp); struct rtentry *rt; @@ -1029,7 +1767,7 @@ tcp_mtudisc(inp, errno) int offered; int mss; #if INET6 - int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV4) == 0; + int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; #endif /* INET6 */ if (tp) { @@ -1038,13 +1776,17 @@ tcp_mtudisc(inp, errno) rt = tcp_rtlookup6(inp); else #endif /* INET6 */ - rt = tcp_rtlookup(inp); + rt = tcp_rtlookup(inp, IFSCOPE_NONE); if (!rt || !rt->rt_rmx.rmx_mtu) { tp->t_maxopd = tp->t_maxseg = #if INET6 isipv6 ? tcp_v6mssdflt : #endif /* INET6 */ tcp_mssdflt; + + /* Route locked during lookup above */ + if (rt != NULL) + RT_UNLOCK(rt); return; } taop = rmx_taop(rt->rt_rmx); @@ -1052,7 +1794,7 @@ tcp_mtudisc(inp, errno) mss = rt->rt_rmx.rmx_mtu - #if INET6 (isipv6 ? - sizeof(struct tcpip6hdr) : + sizeof(struct ip6_hdr) + sizeof(struct tcphdr) : #endif /* INET6 */ sizeof(struct tcpiphdr) #if INET6 @@ -1060,6 +1802,9 @@ tcp_mtudisc(inp, errno) #endif /* INET6 */ ; + /* Route locked during lookup above */ + RT_UNLOCK(rt); + if (offered) mss = min(mss, offered); /* @@ -1086,23 +1831,14 @@ tcp_mtudisc(inp, errno) if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP && (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP) mss -= TCPOLEN_TSTAMP_APPA; - if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC && - (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC) - mss -= TCPOLEN_CC_APPA; -#if (MCLBYTES & (MCLBYTES - 1)) == 0 - if (mss > MCLBYTES) - mss &= ~(MCLBYTES-1); -#else - if (mss > MCLBYTES) - mss = mss / MCLBYTES * MCLBYTES; -#endif + if (so->so_snd.sb_hiwat < mss) mss = so->so_snd.sb_hiwat; tp->t_maxseg = mss; tcpstat.tcps_mturesent++; - tp->t_rtt = 0; + tp->t_rtttime = 0; tp->snd_nxt = tp->snd_una; tcp_output(tp); } @@ -1112,28 +1848,87 @@ tcp_mtudisc(inp, errno) * Look-up the routing entry to the peer of this inpcb. If no route * is found and it cannot be allocated the return NULL. This routine * is called by TCP routines that access the rmx structure and by tcp_mss - * to get the interface MTU. + * to get the interface MTU. If a route is found, this routine will + * hold the rtentry lock; the caller is responsible for unlocking. */ struct rtentry * -tcp_rtlookup(inp) +tcp_rtlookup(inp, input_ifscope) struct inpcb *inp; + unsigned int input_ifscope; { struct route *ro; struct rtentry *rt; + struct tcpcb *tp; + + lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED); ro = &inp->inp_route; - rt = ro->ro_rt; - if (rt == NULL || !(rt->rt_flags & RTF_UP)) { + if ((rt = ro->ro_rt) != NULL) + RT_LOCK(rt); + + if (rt == NULL || !(rt->rt_flags & RTF_UP) || + rt->generation_id != route_generation) { /* No route yet, so try to acquire one */ if (inp->inp_faddr.s_addr != INADDR_ANY) { + unsigned int ifscope; + ro->ro_dst.sa_family = AF_INET; - ro->ro_dst.sa_len = sizeof(ro->ro_dst); + ro->ro_dst.sa_len = sizeof(struct sockaddr_in); ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = inp->inp_faddr; - rtalloc(ro); - rt = ro->ro_rt; + + /* + * If the socket was bound to an interface, then + * the bound-to-interface takes precedence over + * the inbound interface passed in by the caller + * (if we get here as part of the output path then + * input_ifscope is IFSCOPE_NONE). + */ + ifscope = (inp->inp_flags & INP_BOUND_IF) ? + inp->inp_boundif : input_ifscope; + + if (rt != NULL) + RT_UNLOCK(rt); + rtalloc_scoped_ign(ro, 0, ifscope); + if ((rt = ro->ro_rt) != NULL) + RT_LOCK(rt); } } + + /* + * Update MTU discovery determination. Don't do it if: + * 1) it is disabled via the sysctl + * 2) the route isn't up + * 3) the MTU is locked (if it is, then discovery has been + * disabled) + */ + + tp = intotcpcb(inp); + + if (!path_mtu_discovery || ((rt != NULL) && + (!(rt->rt_flags & RTF_UP) || (rt->rt_rmx.rmx_locks & RTV_MTU)))) + tp->t_flags &= ~TF_PMTUD; + else + tp->t_flags |= TF_PMTUD; + +#if CONFIG_IFEF_NOWINDOWSCALE + if (tcp_obey_ifef_nowindowscale && + tp->t_state == TCPS_SYN_SENT && rt != NULL && rt->rt_ifp != NULL && + (rt->rt_ifp->if_eflags & IFEF_NOWINDOWSCALE)) { + /* Window scaling is enabled on this interface */ + tp->t_flags &= ~TF_REQ_SCALE; + } +#endif + + if (rt != NULL && rt->rt_ifp != NULL) { + somultipages(inp->inp_socket, + (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES)); + tcp_set_tso(tp, rt->rt_ifp); + } + + /* + * Caller needs to call RT_UNLOCK(rt). + */ return rt; } @@ -1144,19 +1939,74 @@ tcp_rtlookup6(inp) { struct route_in6 *ro6; struct rtentry *rt; + struct tcpcb *tp; + + lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED); ro6 = &inp->in6p_route; - rt = ro6->ro_rt; - if (rt == NULL || !(rt->rt_flags & RTF_UP)) { + if ((rt = ro6->ro_rt) != NULL) + RT_LOCK(rt); + + if (rt == NULL || !(rt->rt_flags & RTF_UP) || + rt->generation_id != route_generation) { /* No route yet, so try to acquire one */ if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { - ro6->ro_dst.sin6_family = AF_INET6; - ro6->ro_dst.sin6_len = sizeof(ro6->ro_dst); - ro6->ro_dst.sin6_addr = inp->in6p_faddr; - rtalloc((struct route *)ro6); - rt = ro6->ro_rt; + struct sockaddr_in6 *dst6; + + dst6 = (struct sockaddr_in6 *)&ro6->ro_dst; + dst6->sin6_family = AF_INET6; + dst6->sin6_len = sizeof(*dst6); + dst6->sin6_addr = inp->in6p_faddr; + if (rt != NULL) + RT_UNLOCK(rt); + rtalloc_ign((struct route *)ro6, 0); + if ((rt = ro6->ro_rt) != NULL) + RT_LOCK(rt); } } + /* + * Update path MTU Discovery determination + * while looking up the route: + * 1) we have a valid route to the destination + * 2) the MTU is not locked (if it is, then discovery has been + * disabled) + */ + + + tp = intotcpcb(inp); + + /* + * Update MTU discovery determination. Don't do it if: + * 1) it is disabled via the sysctl + * 2) the route isn't up + * 3) the MTU is locked (if it is, then discovery has been + * disabled) + */ + + if (!path_mtu_discovery || ((rt != NULL) && + (!(rt->rt_flags & RTF_UP) || (rt->rt_rmx.rmx_locks & RTV_MTU)))) + tp->t_flags &= ~TF_PMTUD; + else + tp->t_flags |= TF_PMTUD; + +#if CONFIG_IFEF_NOWINDOWSCALE + if (tcp_obey_ifef_nowindowscale && + tp->t_state == TCPS_SYN_SENT && rt != NULL && rt->rt_ifp != NULL && + (rt->rt_ifp->if_eflags & IFEF_NOWINDOWSCALE)) { + /* Window scaling is not enabled on this interface */ + tp->t_flags &= ~TF_REQ_SCALE; + } +#endif + + if (rt != NULL && rt->rt_ifp != NULL) { + somultipages(inp->inp_socket, + (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES)); + tcp_set_tso(tp, rt->rt_ifp); + } + + /* + * Caller needs to call RT_UNLOCK(rt). + */ return rt; } #endif /* INET6 */ @@ -1164,11 +2014,8 @@ tcp_rtlookup6(inp) #if IPSEC /* compute ESP/AH header size for TCP, including outer IP header. */ size_t -ipsec_hdrsiz_tcp(tp, isipv6) +ipsec_hdrsiz_tcp(tp) struct tcpcb *tp; -#if INET6 - int isipv6; -#endif /* INET6 */ { struct inpcb *inp; struct mbuf *m; @@ -1179,40 +2026,29 @@ ipsec_hdrsiz_tcp(tp, isipv6) #endif /* INET6 */ struct tcphdr *th; - if (!tp || !tp->t_template || !(inp = tp->t_inpcb)) + if ((tp == NULL) || ((inp = tp->t_inpcb) == NULL)) return 0; - MGETHDR(m, M_DONTWAIT, MT_DATA); + MGETHDR(m, M_DONTWAIT, MT_DATA); /* MAC-OK */ if (!m) return 0; - + #if INET6 - if (isipv6) { + if ((inp->inp_vflag & INP_IPV6) != 0) { ip6 = mtod(m, struct ip6_hdr *); th = (struct tcphdr *)(ip6 + 1); - m->m_pkthdr.len = m->m_len = sizeof(struct tcpip6hdr); - bcopy((caddr_t)&tp->t_template->tt_i6, (caddr_t)ip6, - sizeof(struct ip6_hdr)); - bcopy((caddr_t)&tp->t_template->tt_t, (caddr_t)th, - sizeof(struct tcphdr)); - } else { + m->m_pkthdr.len = m->m_len = + sizeof(struct ip6_hdr) + sizeof(struct tcphdr); + tcp_fillheaders(tp, ip6, th); + hdrsiz = ipsec6_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); + } else #endif /* INET6 */ + { ip = mtod(m, struct ip *); th = (struct tcphdr *)(ip + 1); m->m_pkthdr.len = m->m_len = sizeof(struct tcpiphdr); - bcopy((caddr_t)&tp->t_template->tt_i, (caddr_t)ip, sizeof(struct ip)); - bcopy((caddr_t)&tp->t_template->tt_t, (caddr_t)th, - sizeof(struct tcphdr)); -#if INET6 - } -#endif /* INET6 */ - -#if INET6 - if (isipv6) - hdrsiz = ipsec6_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); - else -#endif /* INET6 */ + tcp_fillheaders(tp, ip, th); hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); - + } m_free(m); return hdrsiz; } @@ -1227,24 +2063,29 @@ struct rmxp_tao * tcp_gettaocache(inp) struct inpcb *inp; { -#if INET6 - int isipv6 = (inp->inp_vflag & INP_IPV4) == 0; -#endif /* INET6 */ struct rtentry *rt; + struct rmxp_tao *taop; #if INET6 - if (isipv6) + if ((inp->inp_vflag & INP_IPV6) != 0) rt = tcp_rtlookup6(inp); else #endif /* INET6 */ - rt = tcp_rtlookup(inp); + rt = tcp_rtlookup(inp, IFSCOPE_NONE); /* Make sure this is a host route and is up. */ if (rt == NULL || - (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) + (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) { + /* Route locked during lookup above */ + if (rt != NULL) + RT_UNLOCK(rt); return NULL; - - return rmx_taop(rt->rt_rmx); + } + + taop = rmx_taop(rt->rt_rmx); + /* Route locked during lookup above */ + RT_UNLOCK(rt); + return (taop); } /* @@ -1259,3 +2100,185 @@ static void tcp_cleartaocache() { } + +int +tcp_lock(struct socket *so, int refcount, void *lr) +{ + void *lr_saved; + + if (lr == NULL) + lr_saved = __builtin_return_address(0); + else + lr_saved = lr; + + if (so->so_pcb != NULL) { + lck_mtx_lock(((struct inpcb *)so->so_pcb)->inpcb_mtx); + } else { + panic("tcp_lock: so=%p NO PCB! lr=%p lrh= %s\n", + so, lr_saved, solockhistory_nr(so)); + /* NOTREACHED */ + } + + if (so->so_usecount < 0) { + panic("tcp_lock: so=%p so_pcb=%p lr=%p ref=%x lrh= %s\n", + so, so->so_pcb, lr_saved, so->so_usecount, solockhistory_nr(so)); + /* NOTREACHED */ + } + if (refcount) + so->so_usecount++; + so->lock_lr[so->next_lock_lr] = lr_saved; + so->next_lock_lr = (so->next_lock_lr+1) % SO_LCKDBG_MAX; + return (0); +} + +int +tcp_unlock(struct socket *so, int refcount, void *lr) +{ + void *lr_saved; + + if (lr == NULL) + lr_saved = __builtin_return_address(0); + else + lr_saved = lr; + +#ifdef MORE_TCPLOCK_DEBUG + printf("tcp_unlock: so=%p sopcb=%p lock=%p ref=%x lr=%p\n", + so, so->so_pcb, ((struct inpcb *)so->so_pcb)->inpcb_mtx, + so->so_usecount, lr_saved); +#endif + if (refcount) + so->so_usecount--; + + if (so->so_usecount < 0) { + panic("tcp_unlock: so=%p usecount=%x lrh= %s\n", + so, so->so_usecount, solockhistory_nr(so)); + /* NOTREACHED */ + } + if (so->so_pcb == NULL) { + panic("tcp_unlock: so=%p NO PCB usecount=%x lr=%p lrh= %s\n", + so, so->so_usecount, lr_saved, solockhistory_nr(so)); + /* NOTREACHED */ + } else { + lck_mtx_assert(((struct inpcb *)so->so_pcb)->inpcb_mtx, + LCK_MTX_ASSERT_OWNED); + so->unlock_lr[so->next_unlock_lr] = lr_saved; + so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX; + lck_mtx_unlock(((struct inpcb *)so->so_pcb)->inpcb_mtx); + } + return (0); +} + +lck_mtx_t * +tcp_getlock( + struct socket *so, + __unused int locktype) +{ + struct inpcb *inp = sotoinpcb(so); + + if (so->so_pcb) { + if (so->so_usecount < 0) + panic("tcp_getlock: so=%p usecount=%x lrh= %s\n", + so, so->so_usecount, solockhistory_nr(so)); + return(inp->inpcb_mtx); + } + else { + panic("tcp_getlock: so=%p NULL so_pcb %s\n", + so, solockhistory_nr(so)); + return (so->so_proto->pr_domain->dom_mtx); + } +} + +int32_t +tcp_sbspace(struct tcpcb *tp) +{ + struct sockbuf *sb = &tp->t_inpcb->inp_socket->so_rcv; + int32_t space, newspace; + + space = ((int32_t) imin((sb->sb_hiwat - sb->sb_cc), + (sb->sb_mbmax - sb->sb_mbcnt))); + if (space < 0) + space = 0; + +#if TRAFFIC_MGT + if (tp->t_inpcb->inp_socket->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BG_REGULATE) { + if (tcp_background_io_enabled && + tp->t_inpcb->inp_socket->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BG_SUPPRESSED) { + tp->t_flags |= TF_RXWIN0SENT; + return 0; /* Triggers TCP window closing by responding there is no space */ + } + } +#endif /* TRAFFIC_MGT */ + + /* Avoid inscreasing window size if the current window + * is already very low, we could be in "persist" mode and + * we could break some apps (see rdar://5409343) + */ + + if (space < tp->t_maxseg) + return space; + + /* Clip window size for slower link */ + + if (((tp->t_flags & TF_SLOWLINK) != 0) && slowlink_wsize > 0 ) + return imin(space, slowlink_wsize); + + /* + * Check for ressources constraints before over-ajusting the amount of space we can + * advertise in the TCP window size updates. + */ + + if (sbspace_factor && (tp->t_inpcb->inp_pcbinfo->ipi_count < tcp_sockthreshold) && + (total_mb_cnt / 8) < (mbstat.m_clusters / sbspace_factor)) { + if (space < (int32_t)(sb->sb_maxused - sb->sb_cc)) {/* make sure we don't constrain the window if we have enough ressources */ + space = (int32_t) imax((sb->sb_maxused - sb->sb_cc), tp->rcv_maxbyps); + } + newspace = (int32_t) imax(((int32_t)sb->sb_maxused - sb->sb_cc), (int32_t)tp->rcv_maxbyps); + + if (newspace > space) + space = newspace; + } + return space; +} +/* + * Checks TCP Segment Offloading capability for a given connection and interface pair. + */ +void +tcp_set_tso(tp, ifp) + struct tcpcb *tp; + struct ifnet *ifp; +{ +#if INET6 + struct inpcb *inp = tp->t_inpcb; + int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; + + if (isipv6) { + /* + * Radar 6921834: Disable TSO IPv6 because there is no support + * for TSO & HW checksum in ip6_output yet + */ +#if 0 + if (ifp && ifp->if_hwassist & IFNET_TSO_IPV6) { + tp->t_flags |= TF_TSO; + if (ifp->if_tso_v6_mtu != 0) + tp->tso_max_segment_size = ifp->if_tso_v6_mtu; + else + tp->tso_max_segment_size = TCP_MAXWIN; + } else + tp->t_flags &= ~TF_TSO; + +#endif + } else +#endif /* INET6 */ + + { + if (ifp && ifp->if_hwassist & IFNET_TSO_IPV4) { + tp->t_flags |= TF_TSO; + if (ifp->if_tso_v4_mtu != 0) + tp->tso_max_segment_size = ifp->if_tso_v4_mtu; + else + tp->tso_max_segment_size = TCP_MAXWIN; + } else + tp->t_flags &= ~TF_TSO; + } +} +/* DSEP Review Done pl-20051213-v02 @3253,@3391,@3400 */