#if ISFB31
#include "opt_compat.h"
#include "opt_tcpdebug.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/syslog.h>
#if ISFB31
#include <vm/vm_zone.h>
#endif
#include <net/route.h>
#include <net/if.h>
#define _IP_VHL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#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>
#include <netinet/tcpip.h>
#if TCPDEBUG
#include <netinet/tcp_debug.h>
#endif
#include <netinet6/ip6protosw.h>
#if IPSEC
#include <netinet6/ipsec.h>
#endif
#include <sys/kdebug.h>
#define DBG_FNC_TCP_CLOSE NETDBG_CODE(DBG_NETTCP, ((5 << 8) | 2))
int tcp_mssdflt = TCP_MSS;
SYSCTL_INT(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt,
CTLFLAG_RW, &tcp_mssdflt , 0, "");
int tcp_v6mssdflt = TCP6_MSS;
SYSCTL_INT(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt,
CTLFLAG_RW, &tcp_v6mssdflt , 0, "");
static int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
SYSCTL_INT(_net_inet_tcp, TCPCTL_RTTDFLT, rttdflt,
CTLFLAG_RW, &tcp_rttdflt , 0, "");
static int tcp_do_rfc1323 = 1;
SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323,
CTLFLAG_RW, &tcp_do_rfc1323 , 0, "");
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, 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;
#ifndef TCBHASHSIZE
#define TCBHASHSIZE 4096
#endif
#define ALIGNMENT 32
#define ALIGNM1 (ALIGNMENT - 1)
struct inp_tp {
union {
struct inpcb inp;
char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1];
} inp_tp_u;
struct tcpcb tcb;
};
#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;
int get_inpcb_str_size()
{
return sizeof(struct inpcb);
}
int get_tcp_str_size()
{
return sizeof(struct tcpcb);
}
int tcp_freeq __P((struct tcpcb *tp));
void
tcp_init()
{
int hashsize;
vm_size_t str_size;
int i;
tcp_iss = random();
tcp_ccgen = 1;
tcp_cleartaocache();
LIST_INIT(&tcb);
tcbinfo.listhead = &tcb;
if (!(getenv_int("net.inet.tcp.tcbhashsize", &hashsize)))
hashsize = TCBHASHSIZE;
if (!powerof2(hashsize)) {
printf("WARNING: TCB hash size not a power of 2\n");
hashsize = 512;
}
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
str_size = (vm_size_t) sizeof(struct inp_tp);
tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "inpcb_zone");
#endif
#if INET6
#define TCP_LGHDR (sizeof(struct tcpip6hdr))
#else
#define TCP_LGHDR (sizeof(struct tcpiphdr))
#endif
if (max_protohdr < TCP_LGHDR)
max_protohdr = TCP_LGHDR;
if ((max_linkhdr + TCP_LGHDR) > MHLEN)
panic("tcp_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);
delack_bitmask = _MALLOC((4 * hashsize)/32, M_PCB, M_NOWAIT);
if (delack_bitmask == 0)
panic("Delack Memory");
for (i=0; i < (tcbinfo.hashsize / 32); i++)
delack_bitmask[i] = 0;
for (i=0; i < N_TIME_WAIT_SLOTS; i++) {
LIST_INIT(&time_wait_slots[i]);
}
#undef TCP_LGHDR
}
struct tcptemp *
tcp_template(tp)
struct tcpcb *tp;
{
register struct inpcb *inp = tp->t_inpcb;
register struct mbuf *m;
register 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;
#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
return (n);
}
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
{
register int tlen;
int win = 0;
struct route *ro = 0;
struct route sro;
struct ip *ip = iph;
struct tcpiphdr *ti = iph;
struct tcphdr *nth;
#if INET6
struct route_in6 *ro6 = 0;
struct route_in6 sro6;
struct ip6_hdr *ip6 = iph;
struct tcpip6hdr *ti6 = iph;
#endif
if (tp) {
if (!(flags & TH_RST))
win = sbspace(&tp->t_inpcb->inp_socket->so_rcv);
#if INET6
if (isipv6)
ro6 = &tp->t_inpcb->in6p_route;
else
#endif
ro = &tp->t_inpcb->inp_route;
} else {
#if INET6
if (isipv6) {
ro6 = &sro6;
bzero(ro6, sizeof *ro6);
} else {
#endif
ro = &sro;
bzero(ro, sizeof *ro);
#if INET6
}
#endif
}
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,
sizeof(struct ip6_hdr));
ip6 = &ti6->ti6_i;
nth = &ti6->ti6_t;
} else {
#endif
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
}
#endif
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;
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;
nth = (struct tcphdr *)(ip6 + 1);
if (th != nth) {
nth->th_sport = th->th_sport;
nth->th_dport = th->th_dport;
}
} else {
#endif
xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, n_long);
nth = th;
#if INET6
}
#endif
xchg(nth->th_dport, nth->th_sport, n_short);
#undef xchg
}
nth->th_seq = htonl(seq);
nth->th_ack = htonl(ack);
nth->th_x2 = 0;
nth->th_off = sizeof (struct tcphdr) >> 2;
nth->th_flags = flags;
if (tp)
nth->th_win = htons((u_short) (win >> tp->rcv_scale));
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;
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 {
#endif
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
}
#endif
#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
ip,
nth, 0);
#endif
#if IPSEC
ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL);
#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 {
#endif
(void)ip_output(m, NULL, ro, 0, NULL);
if (ro == &sro && ro->ro_rt) {
RTFREE(ro->ro_rt);
}
#if INET6
}
#endif
}
struct tcpcb *
tcp_newtcpcb(inp)
struct inpcb *inp;
{
struct inp_tp *it;
register struct tcpcb *tp;
register struct socket *so = inp->inp_socket;
#if INET6
int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
#endif
if (so->cached_in_sock_layer == 0) {
it = (struct inp_tp *)inp;
tp = &it->tcb;
}
else
tp = (struct tcpcb *) inp->inp_saved_ppcb;
bzero((char *) tp, sizeof(struct tcpcb));
tp->segq.lh_first = NULL;
tp->t_maxseg = tp->t_maxopd =
#if INET6
isipv6 ? tcp_v6mssdflt :
#endif
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->t_inpcb = inp;
tp->t_srtt = TCPTV_SRTTBASE;
tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
tp->t_rttmin = TCPTV_MIN;
tp->t_rxtcur = TCPTV_RTOBASE;
tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
inp->inp_ip_ttl = ip_defttl;
inp->inp_ppcb = (caddr_t)tp;
return (tp);
}
struct tcpcb *
tcp_drop(tp, errno)
register struct tcpcb *tp;
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);
tcpstat.tcps_drops++;
} else
tcpstat.tcps_conndrops++;
if (errno == ETIMEDOUT && tp->t_softerror)
errno = tp->t_softerror;
so->so_error = errno;
return (tcp_close(tp));
}
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);
#endif
register struct rtentry *rt;
int dosavessthresh;
KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_START, tp,0,0,0,0);
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 (tp->t_rttupdated >= 16) {
register u_long i = 0;
#if INET6
if (isipv6) {
struct sockaddr_in6 *sin6;
if ((rt = inp->in6p_route.ro_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
if ((rt = inp->inp_route.ro_rt) == NULL ||
((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr
== INADDR_ANY)
goto no_valid_rt;
if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) {
i = tp->t_srtt *
(RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTT_SCALE));
if (rt->rt_rmx.rmx_rtt && i)
rt->rt_rmx.rmx_rtt =
(rt->rt_rmx.rmx_rtt + i) / 2;
else
rt->rt_rmx.rmx_rtt = i;
tcpstat.tcps_cachedrtt++;
}
if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) {
i = tp->t_rttvar *
(RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTTVAR_SCALE));
if (rt->rt_rmx.rmx_rttvar && i)
rt->rt_rmx.rmx_rttvar =
(rt->rt_rmx.rmx_rttvar + i) / 2;
else
rt->rt_rmx.rmx_rttvar = i;
tcpstat.tcps_cachedrttvar++;
}
i = tp->snd_ssthresh;
if (rt->rt_rmx.rmx_sendpipe != 0)
dosavessthresh = (i < rt->rt_rmx.rmx_sendpipe / 2);
else
dosavessthresh = (i < so->so_snd.sb_hiwat / 2);
if (((rt->rt_rmx.rmx_locks & RTV_SSTHRESH) == 0 &&
i != 0 && rt->rt_rmx.rmx_ssthresh != 0)
|| dosavessthresh) {
i = (i + tp->t_maxseg / 2) / tp->t_maxseg;
if (i < 2)
i = 2;
i *= (u_long)(tp->t_maxseg +
#if INET6
isipv6 ? sizeof (struct tcpip6hdr) :
#endif
sizeof (struct tcpiphdr));
if (rt->rt_rmx.rmx_ssthresh)
rt->rt_rmx.rmx_ssthresh =
(rt->rt_rmx.rmx_ssthresh + i) / 2;
else
rt->rt_rmx.rmx_ssthresh = i;
tcpstat.tcps_cachedssthresh++;
}
}
no_valid_rt:
(void) tcp_freeq(tp);
if (tp->t_template)
(void) m_free(dtom(tp->t_template));
if (so->cached_in_sock_layer)
inp->inp_saved_ppcb = (caddr_t) tp;
inp->inp_ppcb = NULL;
soisdisconnected(so);
#if INET6
if (isipv6)
in6_pcbdetach(inp);
else
#endif
in_pcbdetach(inp);
tcpstat.tcps_closed++;
KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_END, tcpstat.tcps_closed,0,0,0,0);
return ((struct tcpcb *)0);
}
int
tcp_freeq(tp)
struct tcpcb *tp;
{
register struct ipqent *qe;
int rv = 0;
while ((qe = tp->segq.lh_first) != NULL) {
LIST_REMOVE(qe, ipqe_q);
m_freem(qe->ipqe_m);
FREE(qe, M_SONAME);
rv = 1;
}
return (rv);
}
void
tcp_drain()
{
}
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;
if (tp->t_state == TCPS_ESTABLISHED &&
(error == EHOSTUNREACH || error == ENETUNREACH ||
error == EHOSTDOWN)) {
return;
} else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 &&
tp->t_softerror)
so->so_error = error;
else
tp->t_softerror = error;
wakeup((caddr_t) &so->so_timeo);
sorwakeup(so);
sowwakeup(so);
}
static int
tcp_pcblist SYSCTL_HANDLER_ARGS
{
int error, i, n, s;
struct inpcb *inp, **inp_list;
inp_gen_t gencnt;
struct xinpgen xig;
if (req->oldptr == 0) {
n = tcbinfo.ipi_count;
req->oldidx = 2 * (sizeof xig)
+ (n + n/8) * sizeof(struct xtcpcb);
return 0;
}
if (req->newptr != 0)
return EPERM;
s = splnet();
gencnt = tcbinfo.ipi_gencnt;
n = tcbinfo.ipi_count;
splx(s);
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)
return error;
inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK);
if (inp_list == 0)
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)
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) {
struct xtcpcb xt;
xt.xt_len = sizeof xt;
bcopy(inp, &xt.xt_inp, sizeof *inp);
bcopy(inp->inp_ppcb, &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);
}
}
if (!error) {
s = splnet();
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);
return error;
}
SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
tcp_pcblist, "S,xtcpcb", "List of active TCP connections");
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;
if (cmd == PRC_QUENCH)
notify = tcp_quench;
else if (cmd == PRC_MSGSIZE)
notify = tcp_mtudisc;
else if (!PRC_IS_REDIRECT(cmd) &&
((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);
} else
in_pcbnotify(&tcb, sa, 0, zeroin_addr, 0, cmd, notify);
}
#if INET6
void
tcp6_ctlinput(cmd, sa, d)
int cmd;
struct sockaddr *sa;
void *d;
{
register struct tcphdr *thp;
struct tcphdr th;
void (*notify) __P((struct inpcb *, int)) = tcp_notify;
struct sockaddr_in6 sa6;
struct ip6_hdr *ip6;
struct mbuf *m;
int off = 0 ;
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)
notify = tcp_mtudisc;
else if (!PRC_IS_REDIRECT(cmd) &&
((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0))
return;
if (d != NULL) {
struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d;
m = ip6cp->ip6c_m;
ip6 = ip6cp->ip6c_ip6;
off = ip6cp->ip6c_off;
} else {
m = NULL;
ip6 = NULL;
}
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) {
struct in6_addr s;
memcpy(&s, &ip6->ip6_src, sizeof(s));
if (IN6_IS_ADDR_LINKLOCAL(&s))
s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
if (m->m_len < off + sizeof(*thp)) {
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);
}
#endif
void
tcp_quench(inp, errno)
struct inpcb *inp;
int errno;
{
struct tcpcb *tp = intotcpcb(inp);
if (tp)
tp->snd_cwnd = tp->t_maxseg;
}
void
tcp_mtudisc(inp, errno)
struct inpcb *inp;
int errno;
{
struct tcpcb *tp = intotcpcb(inp);
struct rtentry *rt;
struct rmxp_tao *taop;
struct socket *so = inp->inp_socket;
int offered;
int mss;
#if INET6
int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV4) == 0;
#endif
if (tp) {
#if INET6
if (isipv6)
rt = tcp_rtlookup6(inp);
else
#endif
rt = tcp_rtlookup(inp);
if (!rt || !rt->rt_rmx.rmx_mtu) {
tp->t_maxopd = tp->t_maxseg =
#if INET6
isipv6 ? tcp_v6mssdflt :
#endif
tcp_mssdflt;
return;
}
taop = rmx_taop(rt->rt_rmx);
offered = taop->tao_mssopt;
mss = rt->rt_rmx.rmx_mtu -
#if INET6
(isipv6 ?
sizeof(struct tcpip6hdr) :
#endif
sizeof(struct tcpiphdr)
#if INET6
)
#endif
;
if (offered)
mss = min(mss, offered);
if (tp->t_maxopd <= mss)
return;
tp->t_maxopd = mss;
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->snd_nxt = tp->snd_una;
tcp_output(tp);
}
}
struct rtentry *
tcp_rtlookup(inp)
struct inpcb *inp;
{
struct route *ro;
struct rtentry *rt;
ro = &inp->inp_route;
rt = ro->ro_rt;
if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
if (inp->inp_faddr.s_addr != INADDR_ANY) {
ro->ro_dst.sa_family = AF_INET;
ro->ro_dst.sa_len = sizeof(ro->ro_dst);
((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
inp->inp_faddr;
rtalloc(ro);
rt = ro->ro_rt;
}
}
return rt;
}
#if INET6
struct rtentry *
tcp_rtlookup6(inp)
struct inpcb *inp;
{
struct route_in6 *ro6;
struct rtentry *rt;
ro6 = &inp->in6p_route;
rt = ro6->ro_rt;
if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
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;
}
}
return rt;
}
#endif
#if IPSEC
size_t
ipsec_hdrsiz_tcp(tp, isipv6)
struct tcpcb *tp;
#if INET6
int isipv6;
#endif
{
struct inpcb *inp;
struct mbuf *m;
size_t hdrsiz;
struct ip *ip;
#if INET6
struct ip6_hdr *ip6 = NULL;
#endif
struct tcphdr *th;
if (!tp || !tp->t_template || !(inp = tp->t_inpcb))
return 0;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (!m)
return 0;
#if INET6
if (isipv6) {
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 {
#endif
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
#if INET6
if (isipv6)
hdrsiz = ipsec6_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp);
else
#endif
hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp);
m_free(m);
return hdrsiz;
}
#endif
struct rmxp_tao *
tcp_gettaocache(inp)
struct inpcb *inp;
{
#if INET6
int isipv6 = (inp->inp_vflag & INP_IPV4) == 0;
#endif
struct rtentry *rt;
#if INET6
if (isipv6)
rt = tcp_rtlookup6(inp);
else
#endif
rt = tcp_rtlookup(inp);
if (rt == NULL ||
(rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST))
return NULL;
return rmx_taop(rt->rt_rmx);
}
static void
tcp_cleartaocache()
{
}