Added cangw netlink gateway configuration tool.
TODO (in both cangw and can-gw.ko) : Support removal and listing of rules. So far the gateway jobs are only removed on can-gw.ko module unload or when the used CAN netdevices disappear.pull/7/head
Oliver Hartkopp
parent
9327499121
commit
67b604e53b
2
Makefile
2
Makefile
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@ -53,7 +53,7 @@ CFLAGS = -O2 -Wall -Wno-parentheses -I$(KERNELDIR)/include \
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PROGRAMS = candump cansniffer cansend canplayer canlogserver cangen\
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canbusload log2long log2asc asc2log bcmserver\
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isotpdump isotprecv isotpsend isotpsniffer isotptun\
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slcan_attach slcand slcanpty canfdtest
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slcan_attach slcand slcanpty canfdtest cangw
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all: $(PROGRAMS)
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@ -0,0 +1,351 @@
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/*
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* $Id$
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*/
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/*
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* cangw.c - manage PF_CAN netlink gateway
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*
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* Copyright (c) 2010 Volkswagen Group Electronic Research
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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. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* Send feedback to <socketcan-users@lists.berlios.de>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <libgen.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/can/gw.h>
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enum {
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UNSPEC,
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ADD,
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DEL,
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FLUSH,
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LIST
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};
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struct modattr {
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struct can_frame cf;
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__u8 modtype;
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__u8 instruction;
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} __attribute__((packed));
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/* some netlink helpers stolen from iproute2 package */
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#define NLMSG_TAIL(nmsg) \
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((struct rtattr *)(((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
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int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
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int alen)
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{
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int len = RTA_LENGTH(alen);
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struct rtattr *rta;
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if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
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fprintf(stderr, "addattr_l: message exceeded bound of %d\n",
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maxlen);
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return -1;
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}
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rta = NLMSG_TAIL(n);
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rta->rta_type = type;
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rta->rta_len = len;
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memcpy(RTA_DATA(rta), data, alen);
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n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
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return 0;
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}
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void print_usage(char *prg)
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{
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fprintf(stderr, "\nUsage: %s [options]\n\n", prg);
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fprintf(stderr, "Commands: -A (add a new rule)\n");
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fprintf(stderr, " -D (delete a rule) [not yet implemented]\n");
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fprintf(stderr, " -F (flush - delete all rules) [not yet implemented]\n");
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fprintf(stderr, " -L (list all rules) [not yet implemented]\n");
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fprintf(stderr, "Mandatory: -s <src_dev> (source netdevice)\n");
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fprintf(stderr, " -d <dst_dev> (destination netdevice)\n");
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fprintf(stderr, "Options: -t (preserve src_dev rx timestamp)\n");
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fprintf(stderr, " -e (echo sent frames - recommended on vcanx)\n");
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fprintf(stderr, " -f <filter> (set CAN filter)\n");
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fprintf(stderr, " -m <mod> (set frame modifications)\n");
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fprintf(stderr, "\nValues are given and expected in hexadecimal values. Leading 0s can be omitted.\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "<filter> is a <value>:<mask> CAN identifier filter\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "<mod> is a CAN frame modification instruction consisting of\n");
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fprintf(stderr, "<instruction>:<can_frame-elements>:<can_id>.<can_dlc>.<can_data>\n");
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fprintf(stderr, " - <instruction> is one of 'AND' 'OR' 'XOR' 'SET'\n");
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fprintf(stderr, " - <can_frame-elements> is _one_ or _more_ of 'I'dentifier 'L'ength 'D'ata\n");
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fprintf(stderr, " - <can_id> is an u32 value containing the CAN Identifier\n");
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fprintf(stderr, " - <can_dlc> is an u8 value containing the data length code (0 .. 8)\n");
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fprintf(stderr, " - <can_data> is always eight(!) u8 values containing the CAN frames data\n");
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fprintf(stderr, "The instructions are performed in the order 'AND' -> 'OR' -> 'XOR' -> 'SET'\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Example:\n");
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fprintf(stderr, "%s -A -s can0 -d vcan3 -f 123:C00007FF -m SET:IL:80000333.4.1122334455667788\n", prg);
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fprintf(stderr, "\n");
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}
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int parse_mod(char *optarg, struct modattr *modmsg)
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{
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char *ptr, *nptr;
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int i;
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char hexdata[17] = {0};
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ptr = optarg;
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nptr = strchr(ptr, ':');
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if ((nptr - ptr > 3) || (nptr - ptr == 0))
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return 1;
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if (!strncmp(ptr, "AND", 3))
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modmsg->instruction = CGW_MOD_AND;
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else if (!strncmp(ptr, "OR", 2))
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modmsg->instruction = CGW_MOD_OR;
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else if (!strncmp(ptr, "XOR", 3))
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modmsg->instruction = CGW_MOD_XOR;
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else if (!strncmp(ptr, "SET", 3))
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modmsg->instruction = CGW_MOD_SET;
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else
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return 2;
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ptr = nptr+1;
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nptr = strchr(ptr, ':');
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if ((nptr - ptr > 3) || (nptr - ptr == 0))
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return 3;
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modmsg->modtype = 0;
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while (*ptr != ':') {
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switch (*ptr) {
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case 'I':
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modmsg->modtype |= CGW_MOD_ID;
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break;
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case 'L':
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modmsg->modtype |= CGW_MOD_DLC;
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break;
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case 'D':
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modmsg->modtype |= CGW_MOD_DATA;
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break;
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default:
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return 4;
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}
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ptr++;
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}
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if ((sscanf(++ptr, "%lx.%hhd.%16s",
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(long unsigned int *)&modmsg->cf.can_id,
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(unsigned char *)&modmsg->cf.can_dlc, hexdata) != 3) ||
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(modmsg->cf.can_dlc > 8))
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return 5;
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if (strlen(hexdata) != 16)
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return 6;
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for (i = 0; i < 8; i++) {
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if (!sscanf(&hexdata[i*2], "%2hhx", &modmsg->cf.data[i]))
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return 7;
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}
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return 0; /* ok */
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}
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int main(int argc, char **argv)
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{
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int s;
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int err = 0;
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int opt;
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extern int optind, opterr, optopt;
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int cmd = UNSPEC;
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int have_filter = 0;
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struct {
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struct nlmsghdr n;
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struct rtcanmsg r;
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char buf[200];
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} req;
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struct can_filter filter;
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struct sockaddr_nl nladdr;
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struct modattr modmsg[CGW_MOD_FUNCS];
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int modidx = 0;
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int i;
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memset(&req, 0, sizeof(req));
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while ((opt = getopt(argc, argv, "ADFLs:d:tef:m:?")) != -1) {
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switch (opt) {
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case 'A':
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if (cmd == UNSPEC)
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cmd = ADD;
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break;
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case 'D':
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if (cmd == UNSPEC)
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cmd = DEL;
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break;
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case 'F':
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if (cmd == UNSPEC)
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cmd = FLUSH;
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break;
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case 'L':
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if (cmd == UNSPEC)
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cmd = LIST;
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break;
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case 's':
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req.r.src_ifindex = if_nametoindex(optarg);
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break;
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case 'd':
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req.r.dst_ifindex = if_nametoindex(optarg);
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break;
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case 't':
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req.r.can_txflags |= CAN_GW_TXFLAGS_SRC_TSTAMP;
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break;
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case 'e':
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req.r.can_txflags |= CAN_GW_TXFLAGS_ECHO;
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break;
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case 'f':
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if (sscanf(optarg, "%lx:%lx",
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(long unsigned int *)&filter.can_id,
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(long unsigned int *)&filter.can_mask) == 2) {
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have_filter = 1;
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} else {
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printf("Bad filter definition '%s'.\n", optarg);
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exit(1);
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}
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break;
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case 'm':
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/* may be triggered by each of the CGW_MOD_FUNCS functions */
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if ((modidx < CGW_MOD_FUNCS) && (err = parse_mod(optarg, &modmsg[modidx++]))) {
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printf("Problem %d with modification definition '%s'.\n", err, optarg);
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exit(1);
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}
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break;
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case '?':
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print_usage(basename(argv[0]));
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exit(0);
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break;
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default:
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fprintf(stderr, "Unknown option %c\n", opt);
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print_usage(basename(argv[0]));
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exit(1);
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break;
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}
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}
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if ((argc - optind != 0) || (cmd == UNSPEC) ||
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(!req.r.src_ifindex) || (!req.r.dst_ifindex)) {
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print_usage(basename(argv[0]));
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exit(1);
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}
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s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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switch (cmd) {
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case ADD:
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req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
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req.n.nlmsg_type = RTM_NEWROUTE;
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break;
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default:
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printf("This function is not yet implemented.\n");
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exit(1);
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break;
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}
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req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtcanmsg));
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req.n.nlmsg_seq = 0;
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req.r.can_family = AF_CAN;
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/* add new attributes here */
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if (have_filter)
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addattr_l(&req.n, sizeof(req), CGW_FILTER, &filter, sizeof(filter));
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// a better example code
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// modmsg.modtype = CGW_MOD_ID;
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// addattr_l(&req.n, sizeof(req), CGW_MOD_SET, &modmsg, CGW_MODATTR_LEN);
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/* add up to CGW_MOD_FUNCS modification definitions */
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for (i = 0; i < modidx; i++)
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addattr_l(&req.n, sizeof(req), modmsg[i].instruction, &modmsg[i], CGW_MODATTR_LEN);
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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nladdr.nl_pid = 0;
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nladdr.nl_groups = 0;
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err = sendto(s, &req, req.n.nlmsg_len, 0,
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(struct sockaddr*)&nladdr, sizeof(nladdr));
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if (err < 0)
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perror("PF_CAN netlink gateway answered ");
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close(s);
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return err;
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}
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