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Path MTU Discovery is now standard.
This commit is contained in:
Garrett Wollman
parent
21864bc400
commit
b7a44e3486
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=12635
@ -26,7 +26,7 @@
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: in_rmx.c,v 1.19 1995/11/14 20:34:06 phk Exp $
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* $Id: in_rmx.c,v 1.20 1995/12/02 19:37:56 bde Exp $
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*/
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/*
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@ -65,9 +65,9 @@
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#ifndef MTUDISC
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#if 0
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#include <netinet/tcpip.h>
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#endif /* not MTUDISC */
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#endif
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extern int in_inithead __P((void **head, int off));
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extern void in_rtqdrain __P((void));
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@ -110,22 +110,22 @@ in_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
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if (!rt->rt_rmx.rmx_recvpipe && !(rt->rt_rmx.rmx_locks & RTV_RPIPE))
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rt->rt_rmx.rmx_recvpipe = tcp_recvspace;
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#ifndef MTUDISC
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#if 0
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/*
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* Finally, set an MTU, again duplicating logic in TCP.
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* The in_localaddr() business will go away when we have
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* proper PMTU discovery.
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*/
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#endif /* not MTUDISC */
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#endif
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if (!rt->rt_rmx.rmx_mtu && !(rt->rt_rmx.rmx_locks & RTV_MTU)
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&& rt->rt_ifp)
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#ifndef MTUDISC
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#if 0
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rt->rt_rmx.rmx_mtu = (in_localaddr(sin->sin_addr)
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? rt->rt_ifp->if_mtu
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: tcp_mssdflt + sizeof(struct tcpiphdr));
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#else /* MTUDISC */
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#else
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rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
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#endif /* MTUDISC */
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#endif
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return rn_addroute(v_arg, n_arg, head, treenodes);
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}
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
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* $Id: ip_icmp.c,v 1.11 1995/11/14 20:34:12 phk Exp $
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* $Id: ip_icmp.c,v 1.12 1995/11/18 13:25:41 bde Exp $
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*/
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#include <sys/param.h>
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@ -310,7 +310,7 @@ icmp_input(m, hlen)
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printf("deliver to protocol %d\n", icp->icmp_ip.ip_p);
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#endif
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icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
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#ifdef MTUDISC
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#if 1
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/*
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* MTU discovery:
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* If we got a needfrag and there is a host route to the
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@ -338,8 +338,8 @@ icmp_input(m, hlen)
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mtu = ip_next_mtu(rt->rt_rmx.rmx_mtu,
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1);
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if (!mtu || mtu < 296) {
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rt->rt_rmx.rmx_mtu =
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rt->rt_ifp->if_mtu;
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/* rt->rt_rmx.rmx_mtu =
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rt->rt_ifp->if_mtu; */
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rt->rt_rmx.rmx_locks |= RTV_MTU;
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} else if (rt->rt_rmx.rmx_mtu > mtu) {
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rt->rt_rmx.rmx_mtu = mtu;
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@ -349,7 +349,7 @@ icmp_input(m, hlen)
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RTFREE(rt);
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}
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#endif /* MTUDISC */
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#endif
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ctlfunc = inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput;
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if (ctlfunc)
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(*ctlfunc)(code, (struct sockaddr *)&icmpsrc,
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@ -636,7 +636,7 @@ iptime()
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return (htonl(t));
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}
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#ifdef MTUDISC
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#if 1
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/*
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* Return the next larger or smaller MTU plateau (table from RFC 1191)
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* given current value MTU. If DIR is less than zero, a larger plateau
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@ -674,4 +674,4 @@ ip_next_mtu(mtu, dir)
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}
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}
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}
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#endif /* MTUDISC */
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#endif
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
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* $Id: ip_output.c,v 1.24 1995/10/16 18:21:09 wollman Exp $
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* $Id: ip_output.c,v 1.25 1995/11/14 20:34:19 phk Exp $
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*/
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#include <sys/param.h>
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@ -337,7 +337,7 @@ sendit:
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*/
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if (ip->ip_off & IP_DF) {
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error = EMSGSIZE;
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#ifdef MTUDISC
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#if 1
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/*
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* This case can happen if the user changed the MTU
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* of an interface after enabling IP on it. Because
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@ -350,7 +350,7 @@ sendit:
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&& (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
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ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
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}
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#endif /* MTUDISC */
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#endif
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ipstat.ips_cantfrag++;
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goto bad;
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}
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)ip_var.h 8.2 (Berkeley) 1/9/95
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* $Id: ip_var.h,v 1.15 1995/09/21 18:04:43 wollman Exp $
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* $Id: ip_var.h,v 1.16 1995/11/14 20:34:21 phk Exp $
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*/
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#ifndef _NETINET_IP_VAR_H_
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@ -169,9 +169,7 @@ void ip_freemoptions __P((struct ip_moptions *));
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void ip_init __P((void));
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extern int (*ip_mforward) __P((struct ip *, struct ifnet *, struct mbuf *,
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struct ip_moptions *));
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#ifdef MTUDISC
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int ip_next_mtu __P((int, int));
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#endif /* MTUDISC */
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int ip_output __P((struct mbuf *,
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struct mbuf *, struct route *, int, struct ip_moptions *));
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void ip_slowtimo __P((void));
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_output.c 8.4 (Berkeley) 5/24/95
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* $Id: tcp_output.c,v 1.15 1995/10/16 18:21:12 wollman Exp $
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* $Id: tcp_output.c,v 1.16 1995/11/03 22:08:08 olah Exp $
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*/
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#include <sys/param.h>
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@ -653,13 +653,13 @@ send:
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else
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#endif
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{
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#ifdef MTUDISC
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#if 1
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struct rtentry *rt;
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#endif
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((struct ip *)ti)->ip_len = m->m_pkthdr.len;
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((struct ip *)ti)->ip_ttl = tp->t_inpcb->inp_ip.ip_ttl; /* XXX */
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((struct ip *)ti)->ip_tos = tp->t_inpcb->inp_ip.ip_tos; /* XXX */
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#ifdef MTUDISC
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#if 1
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/*
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* See if we should do MTU discovery. We do it only if the following
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* are true:
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@ -672,7 +672,7 @@ send:
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&& !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
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((struct ip *)ti)->ip_off |= IP_DF;
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}
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#endif /* MTUDISC */
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#endif
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error = ip_output(m, tp->t_inpcb->inp_options, &tp->t_inpcb->inp_route,
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so->so_options & SO_DONTROUTE, 0);
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}
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@ -682,7 +682,7 @@ out:
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tcp_quench(tp->t_inpcb, 0);
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return (0);
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}
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#ifdef MTUDISC
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#if 1
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if (error == EMSGSIZE) {
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/*
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* ip_output() will have already fixed the route
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@ -693,7 +693,7 @@ out:
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tcp_mtudisc(tp->t_inpcb, 0);
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return 0;
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}
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#endif /* MTUDISC */.
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#endif
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if ((error == EHOSTUNREACH || error == ENETDOWN)
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&& TCPS_HAVERCVDSYN(tp->t_state)) {
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tp->t_softerror = error;
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
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* $Id: tcp_subr.c,v 1.21 1995/11/09 20:23:05 phk Exp $
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* $Id: tcp_subr.c,v 1.22 1995/11/14 20:34:41 phk Exp $
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*/
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#include <sys/param.h>
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@ -454,10 +454,10 @@ tcp_ctlinput(cmd, sa, ip)
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if (cmd == PRC_QUENCH)
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notify = tcp_quench;
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#ifdef MTUDISC
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#if 1
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else if (cmd == PRC_MSGSIZE)
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notify = tcp_mtudisc;
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#endif /* MTUDISC */
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#endif
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else if (!PRC_IS_REDIRECT(cmd) &&
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((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0))
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return;
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@ -484,7 +484,7 @@ tcp_quench(inp, errno)
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tp->snd_cwnd = tp->t_maxseg;
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}
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#ifdef MTUDISC
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#if 1
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/*
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* When `need fragmentation' ICMP is received, update our idea of the MSS
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* based on the new value in the route. Also nudge TCP to send something,
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@ -541,7 +541,7 @@ tcp_mtudisc(inp, errno)
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tcp_output(tp);
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}
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}
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#endif /* MTUDISC */
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#endif
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/*
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* Look-up the routing entry to the peer of this inpcb. If no route
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
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* $Id: tcp_subr.c,v 1.21 1995/11/09 20:23:05 phk Exp $
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* $Id: tcp_subr.c,v 1.22 1995/11/14 20:34:41 phk Exp $
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*/
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#include <sys/param.h>
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@ -454,10 +454,10 @@ tcp_ctlinput(cmd, sa, ip)
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if (cmd == PRC_QUENCH)
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notify = tcp_quench;
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#ifdef MTUDISC
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#if 1
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else if (cmd == PRC_MSGSIZE)
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notify = tcp_mtudisc;
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#endif /* MTUDISC */
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#endif
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else if (!PRC_IS_REDIRECT(cmd) &&
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((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0))
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return;
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@ -484,7 +484,7 @@ tcp_quench(inp, errno)
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tp->snd_cwnd = tp->t_maxseg;
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}
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#ifdef MTUDISC
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#if 1
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/*
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* When `need fragmentation' ICMP is received, update our idea of the MSS
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* based on the new value in the route. Also nudge TCP to send something,
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@ -541,7 +541,7 @@ tcp_mtudisc(inp, errno)
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tcp_output(tp);
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}
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}
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#endif /* MTUDISC */
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#endif
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/*
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* Look-up the routing entry to the peer of this inpcb. If no route
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
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* $Id: tcp_var.h,v 1.22 1995/11/03 22:08:13 olah Exp $
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* $Id: tcp_var.h,v 1.23 1995/11/14 20:34:50 phk Exp $
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*/
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#ifndef _NETINET_TCP_VAR_H_
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@ -344,9 +344,7 @@ void tcp_init __P((void));
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void tcp_input __P((struct mbuf *, int));
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void tcp_mss __P((struct tcpcb *, int));
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int tcp_mssopt __P((struct tcpcb *));
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#ifdef MTUDISC
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void tcp_mtudisc __P((struct inpcb *, int));
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#endif /* MTUDISC */
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void tcp_mtudisc __P((struct inpcb *, int));
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struct tcpcb *
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tcp_newtcpcb __P((struct inpcb *));
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int tcp_output __P((struct tcpcb *));
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