615 lines
16 KiB
C
615 lines
16 KiB
C
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/*
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* ng_vjc.c
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*/
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/*-
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Archie Cobbs <archie@freebsd.org>
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*
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* $FreeBSD$
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* $Whistle: ng_vjc.c,v 1.17 1999/11/01 09:24:52 julian Exp $
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*/
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/*
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* This node performs Van Jacobson IP header (de)compression.
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* You must have included net/slcompress.c in your kernel compilation.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/errno.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_vjc.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/tcp.h>
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#include <net/slcompress.h>
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/* Check agreement with slcompress.c */
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#if MAX_STATES != NG_VJC_MAX_CHANNELS
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#error NG_VJC_MAX_CHANNELS must be the same as MAX_STATES
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#endif
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/* Maximum length of a compressed TCP VJ header */
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#define MAX_VJHEADER 19
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/* Node private data */
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struct ng_vjc_private {
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struct ngm_vjc_config conf;
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struct slcompress slc;
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hook_p ip;
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hook_p vjcomp;
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hook_p vjuncomp;
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hook_p vjip;
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};
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typedef struct ng_vjc_private *priv_p;
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#define ERROUT(x) do { error = (x); goto done; } while (0)
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/* Netgraph node methods */
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static ng_constructor_t ng_vjc_constructor;
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static ng_rcvmsg_t ng_vjc_rcvmsg;
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static ng_shutdown_t ng_vjc_shutdown;
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static ng_newhook_t ng_vjc_newhook;
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static ng_rcvdata_t ng_vjc_rcvdata;
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static ng_disconnect_t ng_vjc_disconnect;
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/* Helper stuff */
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static struct mbuf *ng_vjc_pulluphdrs(struct mbuf *m, int knownTCP);
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/* Parse type for struct ngm_vjc_config */
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static const struct ng_parse_struct_field ng_vjc_config_type_fields[]
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= NG_VJC_CONFIG_TYPE_INFO;
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static const struct ng_parse_type ng_vjc_config_type = {
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&ng_parse_struct_type,
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&ng_vjc_config_type_fields
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};
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/* Parse type for the 'last_cs' and 'cs_next' fields in struct slcompress,
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which are pointers converted to integer indices, so parse them that way. */
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#ifndef __LP64__
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#define NG_VJC_TSTATE_PTR_TYPE &ng_parse_uint32_type
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#else
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#define NG_VJC_TSTATE_PTR_TYPE &ng_parse_uint64_type
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#endif
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/* Parse type for the 'cs_hdr' field in a struct cstate. Ideally we would
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like to use a 'struct ip' type instead of a simple array of bytes. */
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static const struct ng_parse_fixedarray_info ng_vjc_cs_hdr_type_info = {
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&ng_parse_hint8_type,
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MAX_HDR
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};
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static const struct ng_parse_type ng_vjc_cs_hdr_type = {
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&ng_parse_fixedarray_type,
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&ng_vjc_cs_hdr_type_info
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};
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/* Parse type for a struct cstate */
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static const struct ng_parse_struct_field ng_vjc_cstate_type_fields[] = {
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{ "cs_next", NG_VJC_TSTATE_PTR_TYPE },
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{ "cs_hlen", &ng_parse_uint16_type },
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{ "cs_id", &ng_parse_uint8_type },
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{ "cs_filler", &ng_parse_uint8_type },
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{ "cs_hdr", &ng_vjc_cs_hdr_type },
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{ NULL }
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};
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static const struct ng_parse_type ng_vjc_cstate_type = {
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&ng_parse_struct_type,
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&ng_vjc_cstate_type_fields
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};
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/* Parse type for an array of MAX_STATES struct cstate's, ie, tstate & rstate */
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static const struct ng_parse_fixedarray_info ng_vjc_cstatearray_type_info = {
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&ng_vjc_cstate_type,
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MAX_STATES
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};
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static const struct ng_parse_type ng_vjc_cstatearray_type = {
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&ng_parse_fixedarray_type,
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&ng_vjc_cstatearray_type_info
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};
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/* Parse type for struct slcompress. Keep this in sync with the
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definition of struct slcompress defined in <net/slcompress.h> */
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static const struct ng_parse_struct_field ng_vjc_slcompress_type_fields[] = {
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{ "last_cs", NG_VJC_TSTATE_PTR_TYPE },
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{ "last_recv", &ng_parse_uint8_type },
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{ "last_xmit", &ng_parse_uint8_type },
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{ "flags", &ng_parse_hint16_type },
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#ifndef SL_NO_STATS
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{ "sls_packets", &ng_parse_uint32_type },
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{ "sls_compressed", &ng_parse_uint32_type },
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{ "sls_searches", &ng_parse_uint32_type },
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{ "sls_misses", &ng_parse_uint32_type },
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{ "sls_uncompressedin", &ng_parse_uint32_type },
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{ "sls_compressedin", &ng_parse_uint32_type },
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{ "sls_errorin", &ng_parse_uint32_type },
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{ "sls_tossed", &ng_parse_uint32_type },
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#endif
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{ "tstate", &ng_vjc_cstatearray_type },
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{ "rstate", &ng_vjc_cstatearray_type },
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{ NULL }
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};
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static const struct ng_parse_type ng_vjc_slcompress_type = {
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&ng_parse_struct_type,
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&ng_vjc_slcompress_type_fields
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};
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_vjc_cmds[] = {
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{
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NGM_VJC_COOKIE,
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NGM_VJC_SET_CONFIG,
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"setconfig",
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&ng_vjc_config_type,
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NULL
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},
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{
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NGM_VJC_COOKIE,
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NGM_VJC_GET_CONFIG,
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"getconfig",
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NULL,
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&ng_vjc_config_type,
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},
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{
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NGM_VJC_COOKIE,
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NGM_VJC_GET_STATE,
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"getstate",
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NULL,
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&ng_vjc_slcompress_type,
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},
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{
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NGM_VJC_COOKIE,
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NGM_VJC_CLR_STATS,
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"clrstats",
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NULL,
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NULL,
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},
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{
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NGM_VJC_COOKIE,
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NGM_VJC_RECV_ERROR,
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"recverror",
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NULL,
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NULL,
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},
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{ 0 }
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};
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/* Node type descriptor */
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static struct ng_type ng_vjc_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_VJC_NODE_TYPE,
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.constructor = ng_vjc_constructor,
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.rcvmsg = ng_vjc_rcvmsg,
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.shutdown = ng_vjc_shutdown,
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.newhook = ng_vjc_newhook,
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.rcvdata = ng_vjc_rcvdata,
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.disconnect = ng_vjc_disconnect,
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.cmdlist = ng_vjc_cmds,
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};
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NETGRAPH_INIT(vjc, &ng_vjc_typestruct);
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/************************************************************************
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NETGRAPH NODE METHODS
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************************************************************************/
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/*
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* Create a new node
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*/
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static int
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ng_vjc_constructor(node_p node)
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{
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priv_p priv;
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/* Allocate private structure */
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priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
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NG_NODE_SET_PRIVATE(node, priv);
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/* slcompress is not thread-safe. Protect it's state here. */
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NG_NODE_FORCE_WRITER(node);
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/* Done */
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return (0);
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}
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/*
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* Add a new hook
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*/
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static int
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ng_vjc_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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hook_p *hookp;
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/* Get hook */
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if (strcmp(name, NG_VJC_HOOK_IP) == 0)
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hookp = &priv->ip;
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else if (strcmp(name, NG_VJC_HOOK_VJCOMP) == 0)
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hookp = &priv->vjcomp;
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else if (strcmp(name, NG_VJC_HOOK_VJUNCOMP) == 0)
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hookp = &priv->vjuncomp;
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else if (strcmp(name, NG_VJC_HOOK_VJIP) == 0)
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hookp = &priv->vjip;
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else
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return (EINVAL);
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/* See if already connected */
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if (*hookp)
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return (EISCONN);
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/* OK */
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*hookp = hook;
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return (0);
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}
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/*
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* Receive a control message
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*/
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static int
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ng_vjc_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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struct ng_mesg *resp = NULL;
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int error = 0;
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struct ng_mesg *msg;
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NGI_GET_MSG(item, msg);
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/* Check type cookie */
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switch (msg->header.typecookie) {
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case NGM_VJC_COOKIE:
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switch (msg->header.cmd) {
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case NGM_VJC_SET_CONFIG:
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{
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struct ngm_vjc_config *const c =
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(struct ngm_vjc_config *) msg->data;
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if (msg->header.arglen != sizeof(*c))
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ERROUT(EINVAL);
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if ((priv->conf.enableComp || priv->conf.enableDecomp)
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&& (c->enableComp || c->enableDecomp))
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ERROUT(EALREADY);
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if (c->enableComp) {
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if (c->maxChannel > NG_VJC_MAX_CHANNELS - 1
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|| c->maxChannel < NG_VJC_MIN_CHANNELS - 1)
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ERROUT(EINVAL);
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} else
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c->maxChannel = NG_VJC_MAX_CHANNELS - 1;
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if (c->enableComp != 0 || c->enableDecomp != 0) {
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bzero(&priv->slc, sizeof(priv->slc));
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sl_compress_init(&priv->slc, c->maxChannel);
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}
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priv->conf = *c;
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break;
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}
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case NGM_VJC_GET_CONFIG:
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{
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struct ngm_vjc_config *conf;
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NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
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if (resp == NULL)
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ERROUT(ENOMEM);
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conf = (struct ngm_vjc_config *)resp->data;
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*conf = priv->conf;
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break;
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}
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case NGM_VJC_GET_STATE:
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{
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const struct slcompress *const sl0 = &priv->slc;
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struct slcompress *sl;
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u_int16_t index;
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int i;
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/* Get response structure */
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NG_MKRESPONSE(resp, msg, sizeof(*sl), M_NOWAIT);
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if (resp == NULL)
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ERROUT(ENOMEM);
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sl = (struct slcompress *)resp->data;
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*sl = *sl0;
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/* Replace pointers with integer indices */
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if (sl->last_cs != NULL) {
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index = sl0->last_cs - sl0->tstate;
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bzero(&sl->last_cs, sizeof(sl->last_cs));
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*((u_int16_t *)&sl->last_cs) = index;
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}
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for (i = 0; i < MAX_STATES; i++) {
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struct cstate *const cs = &sl->tstate[i];
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index = sl0->tstate[i].cs_next - sl0->tstate;
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bzero(&cs->cs_next, sizeof(cs->cs_next));
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*((u_int16_t *)&cs->cs_next) = index;
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}
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break;
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}
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case NGM_VJC_CLR_STATS:
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priv->slc.sls_packets = 0;
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priv->slc.sls_compressed = 0;
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priv->slc.sls_searches = 0;
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priv->slc.sls_misses = 0;
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priv->slc.sls_uncompressedin = 0;
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priv->slc.sls_compressedin = 0;
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priv->slc.sls_errorin = 0;
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priv->slc.sls_tossed = 0;
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break;
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case NGM_VJC_RECV_ERROR:
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sl_uncompress_tcp(NULL, 0, TYPE_ERROR, &priv->slc);
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break;
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default:
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error = EINVAL;
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break;
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}
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break;
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default:
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error = EINVAL;
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break;
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}
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done:
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NG_RESPOND_MSG(error, node, item, resp);
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NG_FREE_MSG(msg);
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return (error);
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}
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/*
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* Receive data
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*/
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static int
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ng_vjc_rcvdata(hook_p hook, item_p item)
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{
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const node_p node = NG_HOOK_NODE(hook);
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error = 0;
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struct mbuf *m;
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NGI_GET_M(item, m);
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if (hook == priv->ip) { /* outgoing packet */
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u_int type = TYPE_IP;
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/* Compress packet if enabled and proto is TCP */
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if (priv->conf.enableComp) {
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struct ip *ip;
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if ((m = ng_vjc_pulluphdrs(m, 0)) == NULL) {
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NG_FREE_ITEM(item);
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return (ENOBUFS);
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}
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ip = mtod(m, struct ip *);
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if (ip->ip_p == IPPROTO_TCP) {
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const int origLen = m->m_len;
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type = sl_compress_tcp(m, ip,
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&priv->slc, priv->conf.compressCID);
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m->m_pkthdr.len += m->m_len - origLen;
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}
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}
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/* Dispatch to the appropriate outgoing hook */
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switch (type) {
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case TYPE_IP:
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hook = priv->vjip;
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break;
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case TYPE_UNCOMPRESSED_TCP:
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hook = priv->vjuncomp;
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break;
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case TYPE_COMPRESSED_TCP:
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hook = priv->vjcomp;
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break;
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default:
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panic("%s: type=%d", __func__, type);
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}
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} else if (hook == priv->vjcomp) { /* incoming compressed packet */
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int vjlen, need2pullup;
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struct mbuf *hm;
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u_char *hdr;
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u_int hlen;
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/* Are we decompressing? */
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if (!priv->conf.enableDecomp) {
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NG_FREE_M(m);
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NG_FREE_ITEM(item);
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return (ENXIO);
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}
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/* Pull up the necessary amount from the mbuf */
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need2pullup = MAX_VJHEADER;
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if (need2pullup > m->m_pkthdr.len)
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need2pullup = m->m_pkthdr.len;
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if (m->m_len < need2pullup
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&& (m = m_pullup(m, need2pullup)) == NULL) {
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priv->slc.sls_errorin++;
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NG_FREE_ITEM(item);
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return (ENOBUFS);
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}
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/* Uncompress packet to reconstruct TCP/IP header */
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vjlen = sl_uncompress_tcp_core(mtod(m, u_char *),
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m->m_len, m->m_pkthdr.len, TYPE_COMPRESSED_TCP,
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&priv->slc, &hdr, &hlen);
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if (vjlen <= 0) {
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NG_FREE_M(m);
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NG_FREE_ITEM(item);
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return (EINVAL);
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}
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m_adj(m, vjlen);
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/* Copy the reconstructed TCP/IP headers into a new mbuf */
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MGETHDR(hm, M_NOWAIT, MT_DATA);
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if (hm == NULL) {
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priv->slc.sls_errorin++;
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NG_FREE_M(m);
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NG_FREE_ITEM(item);
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return (ENOBUFS);
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}
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hm->m_len = 0;
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hm->m_pkthdr.rcvif = NULL;
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if (hlen > MHLEN) { /* unlikely, but can happen */
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if (!(MCLGET(hm, M_NOWAIT))) {
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m_freem(hm);
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priv->slc.sls_errorin++;
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NG_FREE_M(m);
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|
NG_FREE_ITEM(item);
|
|
return (ENOBUFS);
|
|
}
|
|
}
|
|
bcopy(hdr, mtod(hm, u_char *), hlen);
|
|
hm->m_len = hlen;
|
|
|
|
/* Glue TCP/IP headers and rest of packet together */
|
|
hm->m_next = m;
|
|
hm->m_pkthdr.len = hlen + m->m_pkthdr.len;
|
|
m = hm;
|
|
hook = priv->ip;
|
|
} else if (hook == priv->vjuncomp) { /* incoming uncompressed pkt */
|
|
u_char *hdr;
|
|
u_int hlen;
|
|
|
|
/* Are we decompressing? */
|
|
if (!priv->conf.enableDecomp) {
|
|
NG_FREE_M(m);
|
|
NG_FREE_ITEM(item);
|
|
return (ENXIO);
|
|
}
|
|
|
|
/* Pull up IP+TCP headers */
|
|
if ((m = ng_vjc_pulluphdrs(m, 1)) == NULL) {
|
|
NG_FREE_ITEM(item);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
/* Run packet through uncompressor */
|
|
if (sl_uncompress_tcp_core(mtod(m, u_char *),
|
|
m->m_len, m->m_pkthdr.len, TYPE_UNCOMPRESSED_TCP,
|
|
&priv->slc, &hdr, &hlen) < 0) {
|
|
NG_FREE_M(m);
|
|
NG_FREE_ITEM(item);
|
|
return (EINVAL);
|
|
}
|
|
hook = priv->ip;
|
|
} else if (hook == priv->vjip) /* incoming regular packet (bypass) */
|
|
hook = priv->ip;
|
|
else
|
|
panic("%s: unknown hook", __func__);
|
|
|
|
/* Send result back out */
|
|
NG_FWD_NEW_DATA(error, item, hook, m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Shutdown node
|
|
*/
|
|
static int
|
|
ng_vjc_shutdown(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
bzero(priv, sizeof(*priv));
|
|
free(priv, M_NETGRAPH);
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(node);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection
|
|
*/
|
|
static int
|
|
ng_vjc_disconnect(hook_p hook)
|
|
{
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
/* Zero out hook pointer */
|
|
if (hook == priv->ip)
|
|
priv->ip = NULL;
|
|
else if (hook == priv->vjcomp)
|
|
priv->vjcomp = NULL;
|
|
else if (hook == priv->vjuncomp)
|
|
priv->vjuncomp = NULL;
|
|
else if (hook == priv->vjip)
|
|
priv->vjip = NULL;
|
|
else
|
|
panic("%s: unknown hook", __func__);
|
|
|
|
/* Go away if no hooks left */
|
|
if ((NG_NODE_NUMHOOKS(node) == 0)
|
|
&& (NG_NODE_IS_VALID(node)))
|
|
ng_rmnode_self(node);
|
|
return (0);
|
|
}
|
|
|
|
/************************************************************************
|
|
HELPER STUFF
|
|
************************************************************************/
|
|
|
|
/*
|
|
* Pull up the full IP and TCP headers of a packet. If packet is not
|
|
* a TCP packet, just pull up the IP header.
|
|
*/
|
|
static struct mbuf *
|
|
ng_vjc_pulluphdrs(struct mbuf *m, int knownTCP)
|
|
{
|
|
struct ip *ip;
|
|
struct tcphdr *tcp;
|
|
int ihlen, thlen;
|
|
|
|
if (m->m_len < sizeof(*ip) && (m = m_pullup(m, sizeof(*ip))) == NULL)
|
|
return (NULL);
|
|
ip = mtod(m, struct ip *);
|
|
if (!knownTCP && ip->ip_p != IPPROTO_TCP)
|
|
return (m);
|
|
ihlen = ip->ip_hl << 2;
|
|
if (m->m_len < ihlen + sizeof(*tcp)) {
|
|
if ((m = m_pullup(m, ihlen + sizeof(*tcp))) == NULL)
|
|
return (NULL);
|
|
ip = mtod(m, struct ip *);
|
|
}
|
|
tcp = (struct tcphdr *)((u_char *)ip + ihlen);
|
|
thlen = tcp->th_off << 2;
|
|
if (m->m_len < ihlen + thlen)
|
|
m = m_pullup(m, ihlen + thlen);
|
|
return (m);
|
|
}
|
|
|