319 lines
9.3 KiB
C
319 lines
9.3 KiB
C
/*
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* Copyright (c) 2007-2011 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* Copyright (c) 1991-1997 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Network Research
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* Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/random.h>
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#include <sys/kernel_types.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/net_osdep.h>
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#include <net/classq/classq.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <libkern/libkern.h>
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#if PF_ECN
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/*
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* read and write diffserv field in IPv4 or IPv6 header
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*/
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u_int8_t
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read_dsfield(struct mbuf *m, struct pf_mtag *t)
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{
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struct mbuf *m0;
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u_int8_t ds_field = 0;
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if (t->pftag_hdr == NULL ||
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!(t->pftag_flags & (PF_TAG_HDR_INET | PF_TAG_HDR_INET6))) {
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return (u_int8_t)0;
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}
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/* verify that hdr is within the mbuf data */
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for (m0 = m; m0 != NULL; m0 = m0->m_next) {
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if (((caddr_t)t->pftag_hdr >= m0->m_data) &&
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((caddr_t)t->pftag_hdr < m0->m_data + m0->m_len)) {
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break;
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}
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}
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if (m0 == NULL) {
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/* ick, tag info is stale */
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printf("%s: can't locate header!\n", __func__);
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return (u_int8_t)0;
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}
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if (t->pftag_flags & PF_TAG_HDR_INET) {
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struct ip *ip = (struct ip *)(void *)t->pftag_hdr;
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if (((uintptr_t)ip + sizeof(*ip)) >
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((uintptr_t)mbuf_datastart(m0) + mbuf_maxlen(m0))) {
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return 0; /* out of bounds */
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}
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if (ip->ip_v != 4) {
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return (u_int8_t)0; /* version mismatch! */
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}
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ds_field = ip->ip_tos;
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} else if (t->pftag_flags & PF_TAG_HDR_INET6) {
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struct ip6_hdr *ip6 = (struct ip6_hdr *)(void *)t->pftag_hdr;
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u_int32_t flowlabel;
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if (((uintptr_t)ip6 + sizeof(*ip6)) >
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((uintptr_t)mbuf_datastart(m0) + mbuf_maxlen(m0))) {
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return 0; /* out of bounds */
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}
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flowlabel = ntohl(ip6->ip6_flow);
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if ((flowlabel >> 28) != 6) {
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return (u_int8_t)0; /* version mismatch! */
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}
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ds_field = (flowlabel >> 20) & 0xff;
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}
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return ds_field;
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}
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void
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write_dsfield(struct mbuf *m, struct pf_mtag *t, u_int8_t dsfield)
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{
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struct mbuf *m0;
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if (t->pftag_hdr == NULL ||
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!(t->pftag_flags & (PF_TAG_HDR_INET | PF_TAG_HDR_INET6))) {
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return;
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}
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/* verify that hdr is within the mbuf data */
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for (m0 = m; m0 != NULL; m0 = m0->m_next) {
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if (((caddr_t)t->pftag_hdr >= m0->m_data) &&
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((caddr_t)t->pftag_hdr < m0->m_data + m0->m_len)) {
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break;
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}
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}
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if (m0 == NULL) {
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/* ick, tag info is stale */
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printf("%s: can't locate header!\n", __func__);
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return;
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}
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if (t->pftag_flags & PF_TAG_HDR_INET) {
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struct ip *ip = (struct ip *)(void *)t->pftag_hdr;
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u_int8_t old;
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int32_t sum;
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if (((uintptr_t)ip + sizeof(*ip)) >
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((uintptr_t)mbuf_datastart(m0) + mbuf_maxlen(m0))) {
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return; /* out of bounds */
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}
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if (ip->ip_v != 4) {
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return; /* version mismatch! */
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}
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old = ip->ip_tos;
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dsfield |= old & 3; /* leave CU bits */
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if (old == dsfield) {
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return;
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}
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ip->ip_tos = dsfield;
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/*
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* update checksum (from RFC1624)
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* HC' = ~(~HC + ~m + m')
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*/
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sum = ~ntohs(ip->ip_sum) & 0xffff;
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sum += 0xff00 + (~old & 0xff) + dsfield;
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16); /* add carry */
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ip->ip_sum = htons(~sum & 0xffff);
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} else if (t->pftag_flags & PF_TAG_HDR_INET6) {
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struct ip6_hdr *ip6 = (struct ip6_hdr *)t->pftag_hdr;
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u_int32_t flowlabel;
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if (((uintptr_t)ip6 + sizeof(*ip6)) >
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((uintptr_t)mbuf_datastart(m0) + mbuf_maxlen(m0))) {
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return; /* out of bounds */
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}
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flowlabel = ntohl(ip6->ip6_flow);
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if ((flowlabel >> 28) != 6) {
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return; /* version mismatch! */
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}
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flowlabel = (flowlabel & 0xf03fffff) | (dsfield << 20);
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ip6->ip6_flow = htonl(flowlabel);
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}
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}
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/*
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* try to mark CE bit to the packet.
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* returns 1 if successfully marked, 0 otherwise.
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*/
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int
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mark_ecn(struct mbuf *m, struct pf_mtag *t, int flags)
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{
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struct mbuf *m0;
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void *hdr;
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int af;
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if ((hdr = t->pftag_hdr) == NULL ||
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!(t->pftag_flags & (PF_TAG_HDR_INET | PF_TAG_HDR_INET6))) {
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return 0;
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}
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/* verify that hdr is within the mbuf data */
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for (m0 = m; m0 != NULL; m0 = m0->m_next) {
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if (((caddr_t)hdr >= m0->m_data) &&
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((caddr_t)hdr < m0->m_data + m0->m_len)) {
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break;
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}
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}
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if (m0 == NULL) {
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/* ick, tag info is stale */
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printf("%s: can't locate header!\n", __func__);
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return 0;
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}
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if (t->pftag_flags & PF_TAG_HDR_INET) {
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af = AF_INET;
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} else if (t->pftag_flags & PF_TAG_HDR_INET6) {
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af = AF_INET6;
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} else {
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af = AF_UNSPEC;
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}
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switch (af) {
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case AF_INET:
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if (flags & CLASSQF_ECN4) { /* REDF_ECN4 == BLUEF_ECN4 */
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struct ip *ip = hdr;
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u_int8_t otos;
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int sum;
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if (((uintptr_t)ip + sizeof(*ip)) >
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((uintptr_t)mbuf_datastart(m0) + mbuf_maxlen(m0))) {
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return 0; /* out of bounds */
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}
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if (ip->ip_v != 4) {
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return 0; /* version mismatch! */
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}
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if ((ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_NOTECT) {
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return 0; /* not-ECT */
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}
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if ((ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_CE) {
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return 1; /* already marked */
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}
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/*
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* ecn-capable but not marked,
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* mark CE and update checksum
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*/
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otos = ip->ip_tos;
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ip->ip_tos |= IPTOS_ECN_CE;
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/*
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* update checksum (from RFC1624) only if hw
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* checksum is not supported.
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* HC' = ~(~HC + ~m + m')
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*/
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if (!(m->m_pkthdr.csum_flags & CSUM_DELAY_IP)) {
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sum = ~ntohs(ip->ip_sum) & 0xffff;
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sum += (~otos & 0xffff) + ip->ip_tos;
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16); /* add carry */
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ip->ip_sum = htons(~sum & 0xffff);
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}
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return 1;
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}
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break;
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case AF_INET6:
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if (flags & CLASSQF_ECN6) { /* REDF_ECN6 == BLUEF_ECN6 */
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struct ip6_hdr *ip6 = hdr;
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u_int32_t flowlabel;
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if (((uintptr_t)ip6 + sizeof(*ip6)) >
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((uintptr_t)mbuf_datastart(m0) + mbuf_maxlen(m0))) {
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return 0; /* out of bounds */
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}
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flowlabel = ntohl(ip6->ip6_flow);
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if ((flowlabel >> 28) != 6) {
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return 0; /* version mismatch! */
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}
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if ((flowlabel & (IPTOS_ECN_MASK << 20)) ==
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(IPTOS_ECN_NOTECT << 20)) {
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return 0; /* not-ECT */
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}
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if ((flowlabel & (IPTOS_ECN_MASK << 20)) ==
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(IPTOS_ECN_CE << 20)) {
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return 1; /* already marked */
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}
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/*
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* ecn-capable but not marked, mark CE
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*/
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flowlabel |= (IPTOS_ECN_CE << 20);
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ip6->ip6_flow = htonl(flowlabel);
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return 1;
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}
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break;
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}
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/* not marked */
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return 0;
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}
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#endif /* PF_ECN */
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