diff options
Diffstat (limited to 'sys/netinet/tcp_subr.c')
| -rw-r--r-- | sys/netinet/tcp_subr.c | 89 |
1 files changed, 86 insertions, 3 deletions
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c index 10e83ab..d05052f 100644 --- a/sys/netinet/tcp_subr.c +++ b/sys/netinet/tcp_subr.c @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93 - * $Id: tcp_subr.c,v 1.4 1994/10/02 17:48:44 phk Exp $ + * $Id: tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp $ */ #include <sys/param.h> @@ -54,16 +54,24 @@ #include <netinet/ip_var.h> #include <netinet/ip_icmp.h> #include <netinet/tcp.h> +#define TCPOUTFLAGS #include <netinet/tcp_fsm.h> #include <netinet/tcp_seq.h> #include <netinet/tcp_timer.h> #include <netinet/tcp_var.h> #include <netinet/tcpip.h> +#ifdef TCPDEBUG +#include <netinet/tcp_debug.h> +#endif /* patchable/settable parameters for tcp */ int tcp_mssdflt = TCP_MSS; int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ; int tcp_do_rfc1323 = 1; +#ifdef TTCP +int tcp_do_rfc1644 = 1; +static void tcp_cleartaocache(void); +#endif extern struct inpcb *tcp_last_inpcb; @@ -75,6 +83,10 @@ tcp_init() { tcp_iss = 1; /* wrong */ +#ifdef TTCP + tcp_ccgen = 1; + tcp_cleartaocache(); +#endif tcb.inp_next = tcb.inp_prev = &tcb; if (max_protohdr < sizeof(struct tcpiphdr)) max_protohdr = sizeof(struct tcpiphdr); @@ -196,6 +208,10 @@ tcp_respond(tp, ti, m, ack, seq, flags) ti->ti_sum = in_cksum(m, tlen); ((struct ip *)ti)->ip_len = tlen; ((struct ip *)ti)->ip_ttl = ip_defttl; +#ifdef TCPDEBUG + if (tp == NULL || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)) + tcp_trace(TA_OUTPUT, 0, tp, ti, 0); +#endif (void) ip_output(m, NULL, ro, 0, NULL); } @@ -215,9 +231,14 @@ tcp_newtcpcb(inp) return ((struct tcpcb *)0); bzero((char *) tp, sizeof(struct tcpcb)); tp->seg_next = tp->seg_prev = (struct tcpiphdr *)tp; - tp->t_maxseg = tcp_mssdflt; + tp->t_maxseg = tp->t_maxopd = tcp_mssdflt; - tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0; + if (tcp_do_rfc1323) + tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP); +#ifdef TTCP + if (tcp_do_rfc1644) + tp->t_flags |= TF_REQ_CC; +#endif tp->t_inpcb = inp; /* * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no @@ -444,3 +465,65 @@ tcp_quench(inp, errno) if (tp) tp->snd_cwnd = tp->t_maxseg; } + +/* + * 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. + */ +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)) { + /* 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); + ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = + inp->inp_faddr; + rtalloc(ro); + rt = ro->ro_rt; + } + } + return rt; +} + +#ifdef TTCP +/* + * Return a pointer to the cached information about the remote host. + * The cached information is stored in the protocol specific part of + * the route metrics. + */ +struct rmxp_tao * +tcp_gettaocache(inp) + struct inpcb *inp; +{ + struct rtentry *rt = tcp_rtlookup(inp); + + /* Make sure this is a host route and is up. */ + if (rt == NULL || + (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) + return NULL; + + return rmx_taop(rt->rt_rmx); +} + +/* + * Clear all the TAO cache entries, called from tcp_init. + * + * XXX + * This routine is just an empty one, because we assume that the routing + * routing tables are initialized at the same time when TCP, so there is + * nothing in the cache left over. + */ +static void +tcp_cleartaocache(void) +{ } +#endif /* TTCP */ |
