diff options
Diffstat (limited to 'sys/netinet/ip_ecn.c')
| -rw-r--r-- | sys/netinet/ip_ecn.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/sys/netinet/ip_ecn.c b/sys/netinet/ip_ecn.c new file mode 100644 index 00000000000..ad8770fcfd7 --- /dev/null +++ b/sys/netinet/ip_ecn.c @@ -0,0 +1,148 @@ +/* $OpenBSD: ip_ecn.c,v 1.1 1999/12/08 06:50:19 itojun Exp $ */ + +/* + * Copyright (C) 1999 WIDE Project. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * KAME Id: ip_ecn.c,v 1.2 1999/07/30 12:17:15 itojun Exp + */ +/* + * ECN consideration on tunnel ingress/egress operation. + * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt + */ + +#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) +#include "opt_inet.h" +#endif + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/errno.h> + +#ifdef INET +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#endif + +#ifdef INET6 +#ifndef INET +#include <netinet/in.h> +#endif +#include <netinet/ip6.h> +#endif + +#include <netinet/ip_ecn.h> + +/* + * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation). + * call it after you've done the default initialization/copy for the outer. + */ +void +ip_ecn_ingress(mode, outer, inner) + int mode; + u_int8_t *outer; + u_int8_t *inner; +{ + if (!outer || !inner) + panic("NULL pointer passed to ip_ecn_ingress"); + + switch (mode) { + case ECN_ALLOWED: /* ECN allowed */ + *outer &= ~IPTOS_CE; + break; + case ECN_FORBIDDEN: /* ECN forbidden */ + *outer &= ~(IPTOS_ECT | IPTOS_CE); + break; + case ECN_NOCARE: /* no consideration to ECN */ + break; + } +} + +/* + * modify inner ECN (TOS) field on egress operation (tunnel decapsulation). + * call it after you've done the default initialization/copy for the inner. + */ +void +ip_ecn_egress(mode, outer, inner) + int mode; + u_int8_t *outer; + u_int8_t *inner; +{ + if (!outer || !inner) + panic("NULL pointer passed to ip_ecn_egress"); + + switch (mode) { + case ECN_ALLOWED: + if (*outer & IPTOS_CE) + *inner |= IPTOS_CE; + break; + case ECN_FORBIDDEN: /* ECN forbidden */ + case ECN_NOCARE: /* no consideration to ECN */ + break; + } +} + +#ifdef INET6 +void +ip6_ecn_ingress(mode, outer, inner) + int mode; + u_int32_t *outer; + u_int32_t *inner; +{ + u_int8_t outer8, inner8; + + if (!outer || !inner) + panic("NULL pointer passed to ip6_ecn_ingress"); + + outer8 = (ntohl(*outer) >> 20) & 0xff; + inner8 = (ntohl(*inner) >> 20) & 0xff; + ip_ecn_ingress(mode, &outer8, &inner8); + *outer &= ~htonl(0xff << 20); + *outer |= htonl((u_int32_t)outer8 << 20); +} + +void +ip6_ecn_egress(mode, outer, inner) + int mode; + u_int32_t *outer; + u_int32_t *inner; +{ + u_int8_t outer8, inner8; + + if (!outer || !inner) + panic("NULL pointer passed to ip6_ecn_egress"); + + outer8 = (ntohl(*outer) >> 20) & 0xff; + inner8 = (ntohl(*inner) >> 20) & 0xff; + ip_ecn_egress(mode, &outer8, &inner8); + *inner &= ~htonl(0xff << 20); + *inner |= htonl((u_int32_t)inner8 << 20); +} +#endif |