* 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 $
*/
-#if ISFB31
-#include "opt_compat.h"
-#include "opt_tcpdebug.h"
-#endif
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/callout.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
+#if INET6
#include <sys/domain.h>
+#endif
+#include <sys/proc.h>
+#include <sys/kauth.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
+#include <sys/random.h>
#include <sys/syslog.h>
+#include <kern/locks.h>
-#if ISFB31
-#include <vm/vm_zone.h>
-#endif
#include <net/route.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
+#if INET6
+#include <netinet/ip6.h>
+#endif
#include <netinet/in_pcb.h>
+#if INET6
+#include <netinet6/in6_pcb.h>
+#endif
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#if INET6
-#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
-#include <netinet6/in6_pcb.h>
#endif
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
+#if INET6
+#include <netinet6/tcp6_var.h>
+#endif
#include <netinet/tcpip.h>
#if TCPDEBUG
#include <netinet/tcp_debug.h>
#if IPSEC
#include <netinet6/ipsec.h>
+#if INET6
+#include <netinet6/ipsec6.h>
+#endif
#endif /*IPSEC*/
+#include <sys/md5.h>
#include <sys/kdebug.h>
#define DBG_FNC_TCP_CLOSE NETDBG_CODE(DBG_NETTCP, ((5 << 8) | 2))
-#ifndef offsetof /* XXX */
-#define offsetof(type, member) ((size_t)(&((type *)0)->member))
-#endif
+extern int tcp_lq_overflow;
+
+/* temporary: for testing */
+#if IPSEC
+extern int ipsec_bypass;
+extern lck_mtx_t *sadb_mutex;
+#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");
+
+static int tcp_tcbhashsize = 0;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD,
+ &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
+
+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");
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD, &tcbinfo.ipi_count,
- 0, "Number of active PCBs");
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD,
+ &tcbinfo.ipi_count, 0, "Number of active PCBs");
-static void tcp_cleartaocache __P((void));
-static void tcp_notify __P((struct inpcb *, int));
-extern u_long current_active_connections;
+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 void tcp_cleartaocache(void);
+static void tcp_notify(struct inpcb *, int);
/*
* Target size of TCP PCB hash tables. Must be a power of two.
char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1];
} inp_tp_u;
struct tcpcb tcb;
+#ifndef __APPLE__
+ struct callout inp_tp_rexmt, inp_tp_persist, inp_tp_keep, inp_tp_2msl;
+ struct callout inp_tp_delack;
+#endif
};
#undef ALIGNMENT
#undef ALIGNM1
extern struct inpcbhead time_wait_slots[];
extern int cur_tw_slot;
extern u_long *delack_bitmask;
+extern u_long route_generation;
int get_inpcb_str_size()
return sizeof(struct tcpcb);
}
-int tcp_freeq __P((struct tcpcb *tp));
+int tcp_freeq(struct tcpcb *tp);
/*
void
tcp_init()
{
- int hashsize;
- vm_size_t str_size;
- int i;
-
-#ifdef TCP_COMPAT_42
- tcp_iss = 1;
-#endif /* TCP_COMPAT_42 */
+ int hashsize = TCBHASHSIZE;
+ vm_size_t str_size;
+ int i;
+ struct inpcbinfo *pcbinfo;
+
tcp_ccgen = 1;
tcp_cleartaocache();
+
+ tcp_delacktime = TCPTV_DELACK;
+ 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 & 0x7fffffff; /* Starts tcp internal 500ms clock at a random value */
+
+
LIST_INIT(&tcb);
tcbinfo.listhead = &tcb;
- if (!(getenv_int("net.inet.tcp.tcbhashsize", &hashsize)))
- hashsize = TCBHASHSIZE;
+ pcbinfo = &tcbinfo;
+#ifndef __APPLE__
+ TUNABLE_INT_FETCH("net.inet.tcp.tcbhashsize", &hashsize);
+#endif
if (!powerof2(hashsize)) {
printf("WARNING: TCB hash size not a power of 2\n");
hashsize = 512; /* safe default */
}
+ tcp_tcbhashsize = hashsize;
tcbinfo.hashsize = hashsize;
tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask);
tcbinfo.porthashbase = hashinit(hashsize, M_PCB,
&tcbinfo.porthashmask);
-#if ISFB31
- tcbinfo.ipi_zone = (void *) zinit("tcpcb", sizeof(struct inp_tp), maxsockets,
- ZONE_INTERRUPT, 0);
-#else
+#ifdef __APPLE__
str_size = (vm_size_t) sizeof(struct inp_tp);
- tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "inpcb_zone");
+ tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "tcpcb");
+#else
+ tcbinfo.ipi_zone = zinit("tcpcb", sizeof(struct inp_tp), maxsockets,
+ ZONE_INTERRUPT, 0);
+#endif
+
+ tcp_reass_maxseg = nmbclusters / 16;
+#ifndef __APPLE__
+ TUNABLE_INT_FETCH("net.inet.tcp.reass.maxsegments",
+ &tcp_reass_maxseg);
#endif
+
#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");
-
- tcbinfo.last_pcb = 0;
+#undef TCP_MINPROTOHDR
dummy_tcb.t_state = TCP_NSTATES;
dummy_tcb.t_flags = 0;
tcbinfo.dummy_cb = (caddr_t) &dummy_tcb;
+
+ /*
+ * 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();
+
+ 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... */
+ }
+
+
in_pcb_nat_init(&tcbinfo, AF_INET, IPPROTO_TCP, SOCK_STREAM);
delack_bitmask = _MALLOC((4 * hashsize)/32, M_PCB, M_WAITOK);
for (i=0; i < N_TIME_WAIT_SLOTS; i++) {
LIST_INIT(&time_wait_slots[i]);
}
-#undef TCP_LGHDR
+}
+
+/*
+ * 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.
+ */
+void
+tcp_fillheaders(tp, ip_ptr, tcp_ptr)
+ struct tcpcb *tp;
+ void *ip_ptr;
+ void *tcp_ptr;
+{
+ struct inpcb *inp = tp->t_inpcb;
+ struct tcphdr *tcp_hdr = (struct tcphdr *)tcp_ptr;
+
+#if INET6
+ 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));
+ }
+
+ 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.
- * 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.
+ * 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_template(tp)
+tcp_maketemplate(tp)
struct tcpcb *tp;
{
- register struct inpcb *inp = tp->t_inpcb;
- register struct mbuf *m;
- register struct tcptemp *n;
+ struct mbuf *m;
+ struct tcptemp *n;
- 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;
-
- n->tt_t.th_sum = in_pseudo(n->tt_src.s_addr, n->tt_dst.s_addr,
- htons(sizeof(struct tcphdr) + IPPROTO_TCP));
+ m = m_get(M_DONTWAIT, MT_HEADER);
+ if (m == NULL)
+ return (0);
+ m->m_len = sizeof(struct tcptemp);
+ n = mtod(m, struct tcptemp *);
-#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);
- }
- 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_fillheaders(tp, (void *)&n->tt_ipgen, (void *)&n->tt_t);
return (n);
}
* 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.
* NOTE: If m != NULL, then ti must point to *inside* the mbuf.
*/
void
-tcp_respond(tp, iph, th, m, ack, seq, flags, isipv6)
+tcp_respond(tp, ipgen, th, m, ack, seq, flags)
struct tcpcb *tp;
- void *iph;
+ void *ipgen;
register struct tcphdr *th;
register struct mbuf *m;
tcp_seq ack, seq;
int flags;
-#if INET6
- int isipv6;
-#endif
{
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 */
+ int ipflags = 0;
+
+#if INET6
+ isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6;
+ ip6 = ipgen;
#endif /* INET6 */
+ ip = ipgen;
if (tp) {
- if (!(flags & TH_RST))
+ if (!(flags & TH_RST)) {
win = sbspace(&tp->t_inpcb->inp_socket->so_rcv);
+ if (win > (long)TCP_MAXWIN << tp->rcv_scale)
+ win = (long)TCP_MAXWIN << tp->rcv_scale;
+ }
#if INET6
if (isipv6)
ro6 = &tp->t_inpcb->in6p_route;
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);
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;
nth->th_seq = htonl(seq);
nth->th_ack = htonl(ack);
nth->th_x2 = 0;
else
nth->th_win = htons((u_short)win);
nth->th_urp = 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;
- nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
- htons((u_short)(tlen + IPPROTO_TCP)));
- m->m_pkthdr.csum_flags = CSUM_TCP;
- m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
-
- 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 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, ipflags, 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
+ {
+ (void) ip_output_list(m, 0, NULL, ro, ipflags, NULL);
+ if (ro == &sro && ro->ro_rt) {
+ rtfree(ro->ro_rt);
+ ro->ro_rt = NULL;
+ }
}
-#endif /* INET6 */
}
/*
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;
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;
+
+#ifndef __APPLE__
+ /* Set up our timeouts. */
+ callout_init(tp->tt_rexmt = &it->inp_tp_rexmt);
+ callout_init(tp->tt_persist = &it->inp_tp_persist);
+ callout_init(tp->tt_keep = &it->inp_tp_keep);
+ callout_init(tp->tt_2msl = &it->inp_tp_2msl);
+ callout_init(tp->tt_delack = &it->inp_tp_delack);
+#endif
if (tcp_do_rfc1323)
tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
tp->t_rxtcur = TCPTV_RTOBASE;
tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
- /*
+ /*
* 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;
{
struct socket *so = tp->t_inpcb->inp_socket;
+#ifdef __APPLE__
switch (tp->t_state)
{
case TCPS_ESTABLISHED:
case TCPS_CLOSING:
case TCPS_CLOSE_WAIT:
case TCPS_LAST_ACK:
- current_active_connections--;
break;
}
-
+#endif
+
if (TCPS_HAVERCVDSYN(tp->t_state)) {
tp->t_state = TCPS_CLOSED;
(void) tcp_output(tp);
tcp_close(tp)
register struct tcpcb *tp;
{
- register struct mbuf *q;
- register struct mbuf *nq;
+ register struct tseg_qent *q;
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;
int dosavessthresh;
+ if ( inp->inp_ppcb == NULL) /* tcp_close was called previously, bail */
+ return;
+
+#ifndef __APPLE__
+ /*
+ * Make sure that all of our timers are stopped before we
+ * delete the PCB.
+ */
+ callout_stop(tp->tt_rexmt);
+ callout_stop(tp->tt_persist);
+ callout_stop(tp->tt_keep);
+ callout_stop(tp->tt_2msl);
+ callout_stop(tp->tt_delack);
+#else
+ /* Clear the timers before we delete the PCB. */
+ {
+ int i;
+ for (i = 0; i < TCPT_NTIMERS; i++) {
+ tp->t_timer[i] = 0;
+ }
+ }
+#endif
KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_START, tp,0,0,0,0);
switch (tp->t_state)
case TCPS_CLOSING:
case TCPS_CLOSE_WAIT:
case TCPS_LAST_ACK:
- current_active_connections--;
break;
}
goto no_valid_rt;
}
else
-#endif /* INET6 */
- if ((rt = inp->inp_route.ro_rt) == NULL ||
+#endif /* INET6 */
+ rt = inp->inp_route.ro_rt;
+ if (rt == NULL ||
((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr
- == INADDR_ANY)
+ == INADDR_ANY || rt->generation_id != route_generation) {
+ if (tp->t_state >= TCPS_CLOSE_WAIT)
+ tp->t_state = TCPS_CLOSING;
+
goto no_valid_rt;
+ }
if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) {
i = tp->t_srtt *
i = 2;
i *= (u_long)(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;
tcpstat.tcps_cachedssthresh++;
}
}
+ rt = inp->inp_route.ro_rt;
+ if (rt) {
+ /*
+ * mark route for deletion if no information is
+ * cached.
+ */
+ if ((tp->t_flags & TF_LQ_OVERFLOW) && tcp_lq_overflow &&
+ ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0)){
+ if (rt->rt_rmx.rmx_rtt == 0)
+ rt->rt_flags |= RTF_DELCLONE;
+ }
+ }
no_valid_rt:
/* free the reassembly queue, if any */
(void) tcp_freeq(tp);
- if (tp->t_template)
- (void) m_free(dtom(tp->t_template));
-
+#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 */
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);
void
tcp_drain()
{
+/*
+ * ###LD 05/19/04 locking issue, tcpdrain is disabled, deadlock situation with tcbinfo.mtx
+ */
+ 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.
+ */
+ lck_rw_lock_exclusive(tcbinfo.mtx);
+ 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.
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
}
-
static int
tcp_pcblist SYSCTL_HANDLER_ARGS
{
* 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)
+ 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);
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) {
+ bcopy(inp_ppcb, &xt.xt_tp, sizeof 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);
* 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");
+#ifndef __APPLE__
+static int
+tcp_getcred(SYSCTL_HANDLER_ARGS)
+{
+ struct sockaddr_in addrs[2];
+ struct inpcb *inp;
+ int error, s;
+
+ error = suser(req->p);
+ if (error)
+ return (error);
+ error = SYSCTL_IN(req, addrs, sizeof(addrs));
+ if (error)
+ return (error);
+ s = splnet();
+ inp = in_pcblookup_hash(&tcbinfo, addrs[1].sin_addr, addrs[1].sin_port,
+ addrs[0].sin_addr, addrs[0].sin_port, 0, NULL);
+ if (inp == NULL || inp->inp_socket == NULL) {
+ error = ENOENT;
+ goto out;
+ }
+ error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(*(kauth_cred_t)0);
+out:
+ splx(s);
+ return (error);
+}
+
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
+ 0, 0, tcp_getcred, "S,ucred", "Get the ucred of a TCP connection");
+
+#if INET6
+static int
+tcp6_getcred(SYSCTL_HANDLER_ARGS)
+{
+ struct sockaddr_in6 addrs[2];
+ struct inpcb *inp;
+ int error, s, mapped = 0;
+
+ error = suser(req->p);
+ if (error)
+ return (error);
+ error = SYSCTL_IN(req, addrs, sizeof(addrs));
+ if (error)
+ return (error);
+ if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) {
+ if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr))
+ mapped = 1;
+ else
+ return (EINVAL);
+ }
+ s = splnet();
+ if (mapped == 1)
+ inp = in_pcblookup_hash(&tcbinfo,
+ *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12],
+ addrs[1].sin6_port,
+ *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12],
+ addrs[0].sin6_port,
+ 0, NULL);
+ else
+ inp = in6_pcblookup_hash(&tcbinfo, &addrs[1].sin6_addr,
+ addrs[1].sin6_port,
+ &addrs[0].sin6_addr, addrs[0].sin6_port,
+ 0, NULL);
+ if (inp == NULL || inp->inp_socket == NULL) {
+ error = ENOENT;
+ goto out;
+ }
+ error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
+ sizeof(*(kauth_cred_t)0);
+out:
+ splx(s);
+ return (error);
+}
+
+SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
+ 0, 0,
+ tcp6_getcred, "S,ucred", "Get the ucred of a TCP6 connection");
+#endif
+#endif /* __APPLE__*/
+
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;
+ struct ip *ip = vip;
+ struct tcphdr *th;
+ struct in_addr faddr;
+ struct inpcb *inp;
+ struct tcpcb *tp;
+ void (*notify)(struct inpcb *, int) = tcp_notify;
+ tcp_seq icmp_seq;
+ int s;
+
+ faddr = ((struct sockaddr_in *)sa)->sin_addr;
+ if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
+ return;
if (cmd == PRC_QUENCH)
notify = tcp_quench;
+ else if (icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
+ cmd == PRC_UNREACH_PORT) && ip)
+ notify = tcp_drop_syn_sent;
else if (cmd == PRC_MSGSIZE)
notify = tcp_mtudisc;
- else if (!PRC_IS_REDIRECT(cmd) &&
- ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0))
+ else if (PRC_IS_REDIRECT(cmd)) {
+ ip = 0;
+ notify = in_rtchange;
+ } else if (cmd == PRC_HOSTDEAD)
+ ip = 0;
+ else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
return;
if (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);
+ 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_seq = htonl(th->th_seq);
+ tp = intotcpcb(inp);
+ if (SEQ_GEQ(icmp_seq, tp->snd_una) &&
+ SEQ_LT(icmp_seq, tp->snd_max))
+ (*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
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))
/* 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);
+ in6_pcbnotify(&tcbinfo, sa, th.th_dport,
+ (struct sockaddr *)ip6cp->ip6c_src,
+ th.th_sport, cmd, notify);
} else
- in6_pcbnotify(&tcb, (struct sockaddr *)&sa6, 0, &zeroin6_addr,
+ in6_pcbnotify(&tcbinfo, sa, 0, (struct sockaddr *)sa6_src,
0, cmd, notify);
}
#endif /* INET6 */
-#define TCP_RNDISS_ROUNDS 16
-#define TCP_RNDISS_OUT 7200
-#define TCP_RNDISS_MAX 30000
-
-u_int8_t tcp_rndiss_sbox[128];
-u_int16_t tcp_rndiss_msb;
-u_int16_t tcp_rndiss_cnt;
-long tcp_rndiss_reseed;
-
-u_int16_t
-tcp_rndiss_encrypt(val)
- u_int16_t val;
-{
- u_int16_t sum = 0, i;
-
- for (i = 0; i < TCP_RNDISS_ROUNDS; i++) {
- sum += 0x79b9;
- val ^= ((u_int16_t)tcp_rndiss_sbox[(val^sum) & 0x7f]) << 7;
- val = ((val & 0xff) << 7) | (val >> 8);
- }
-
- return val;
-}
-void
-tcp_rndiss_init()
-{
- struct timeval time;
+/*
+ * 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.
+ *
+ */
- getmicrotime(&time);
- read_random(tcp_rndiss_sbox, sizeof(tcp_rndiss_sbox));
+#define ISN_BYTES_PER_SECOND 1048576
- tcp_rndiss_reseed = time.tv_sec + TCP_RNDISS_OUT;
- tcp_rndiss_msb = tcp_rndiss_msb == 0x8000 ? 0 : 0x8000;
- tcp_rndiss_cnt = 0;
-}
+u_char isn_secret[32];
+int isn_last_reseed;
+MD5_CTX isn_ctx;
tcp_seq
-tcp_rndiss_next()
+tcp_new_isn(tp)
+ struct tcpcb *tp;
{
- u_int32_t tmp;
- struct timeval time;
-
- getmicrotime(&time);
-
- if (tcp_rndiss_cnt >= TCP_RNDISS_MAX ||
- time.tv_sec > tcp_rndiss_reseed)
- tcp_rndiss_init();
-
- tmp = random();
+ u_int32_t md5_buffer[4];
+ tcp_seq new_isn;
+ struct timeval time;
+
+ /* 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
- /* (tmp & 0x7fff) ensures a 32768 byte gap between ISS */
- return ((tcp_rndiss_encrypt(tcp_rndiss_cnt++) | tcp_rndiss_msb) <<16) |
- (tmp & 0x7fff);
+ /* 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)time.tv_sec))) {
+#ifdef __APPLE__
+ read_random(&isn_secret, sizeof(isn_secret));
+#else
+ read_random_unlimited(&isn_secret, sizeof(isn_secret));
+#endif
+ isn_last_reseed = time.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 += time.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.
tp->snd_cwnd = tp->t_maxseg;
}
+/*
+ * 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_drop_syn_sent(inp, errno)
+ struct inpcb *inp;
+ int errno;
+{
+ struct tcpcb *tp = intotcpcb(inp);
+
+ if (tp && tp->t_state == TCPS_SYN_SENT)
+ tcp_drop(tp, errno);
+}
+
/*
* When `need fragmentation' ICMP is received, update our idea of the MSS
* based on the new value in the route. Also nudge TCP to send something,
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) {
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
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);
}
if (ro == NULL)
return (NULL);
rt = ro->ro_rt;
- if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
+ 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) {
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);
if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
/* 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;
+ 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;
rtalloc((struct route *)ro6);
rt = ro6->ro_rt;
}
#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;
#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);
if (!m)
return 0;
-
+
+ lck_mtx_lock(sadb_mutex);
#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);
-
+ }
+ lck_mtx_unlock(sadb_mutex);
m_free(m);
return hdrsiz;
}
tcp_gettaocache(inp)
struct inpcb *inp;
{
-#if INET6
- int isipv6 = (inp->inp_vflag & INP_IPV4) == 0;
-#endif /* INET6 */
struct rtentry *rt;
#if INET6
- if (isipv6)
+ if ((inp->inp_vflag & INP_IPV6) != 0)
rt = tcp_rtlookup6(inp);
else
#endif /* INET6 */
tcp_cleartaocache()
{
}
+
+int
+tcp_lock(so, refcount, lr)
+ struct socket *so;
+ int refcount;
+ int lr;
+{
+ int lr_saved;
+ if (lr == 0)
+ lr_saved = (unsigned int) __builtin_return_address(0);
+ else lr_saved = lr;
+
+ if (so->so_pcb) {
+ lck_mtx_lock(((struct inpcb *)so->so_pcb)->inpcb_mtx);
+ }
+ else {
+ panic("tcp_lock: so=%x NO PCB! lr=%x\n", so, lr_saved);
+ lck_mtx_lock(so->so_proto->pr_domain->dom_mtx);
+ }
+
+ if (so->so_usecount < 0)
+ panic("tcp_lock: so=%x so_pcb=%x lr=%x ref=%x\n",
+ so, so->so_pcb, lr_saved, so->so_usecount);
+
+ if (refcount)
+ so->so_usecount++;
+ so->lock_lr[so->next_lock_lr] = (u_int32_t *)lr_saved;
+ so->next_lock_lr = (so->next_lock_lr+1) % SO_LCKDBG_MAX;
+ return (0);
+}
+
+int
+tcp_unlock(so, refcount, lr)
+ struct socket *so;
+ int refcount;
+ int lr;
+{
+ int lr_saved;
+ if (lr == 0)
+ lr_saved = (unsigned int) __builtin_return_address(0);
+ else lr_saved = lr;
+
+#ifdef MORE_TCPLOCK_DEBUG
+ printf("tcp_unlock: so=%x sopcb=%x lock=%x ref=%x lr=%x\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=%x usecount=%x\n", so, so->so_usecount);
+ if (so->so_pcb == NULL)
+ panic("tcp_unlock: so=%x NO PCB usecount=%x lr=%x\n", so, so->so_usecount, lr_saved);
+ else {
+ lck_mtx_assert(((struct inpcb *)so->so_pcb)->inpcb_mtx, LCK_MTX_ASSERT_OWNED);
+ so->unlock_lr[so->next_unlock_lr] = (u_int *)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(so, locktype)
+ struct socket *so;
+ int locktype;
+{
+ struct inpcb *inp = sotoinpcb(so);
+
+ if (so->so_pcb) {
+ if (so->so_usecount < 0)
+ panic("tcp_getlock: so=%x usecount=%x\n", so, so->so_usecount);
+ return(inp->inpcb_mtx);
+ }
+ else {
+ panic("tcp_getlock: so=%x NULL so_pcb\n", so);
+ return (so->so_proto->pr_domain->dom_mtx);
+ }
+}
projects / apple / xnu.git / blobdiff