+++ /dev/null
-/*
- * $Id: cangw.c 1197 2010-09-25 10:24:37Z hartkopp $
- */
-
-/*
- * cangw.c - manage PF_CAN netlink gateway
- *
- * Copyright (c) 2010 Volkswagen Group Electronic Research
- * 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 Volkswagen nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * Alternatively, provided that this notice is retained in full, this
- * software may be distributed under the terms of the GNU General
- * Public License ("GPL") version 2, in which case the provisions of the
- * GPL apply INSTEAD OF those given above.
- *
- * The provided data structures and external interfaces from this code
- * are not restricted to be used by modules with a GPL compatible license.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
- * OWNER 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.
- *
- * Send feedback to <socketcan-users@lists.berlios.de>
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <libgen.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <sys/socket.h>
-#include <net/if.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <arpa/inet.h>
-#include <gw.h>
-
-enum {
- UNSPEC,
- ADD,
- DEL,
- FLUSH,
- LIST
-};
-
-struct modattr {
- struct can_frame cf;
- __u8 modtype;
- __u8 instruction;
-} __attribute__((packed));
-
-
-#define RTCAN_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtcanmsg))))
-#define RTCAN_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtcanmsg))
-
-/* some netlink helpers stolen from iproute2 package */
-#define NLMSG_TAIL(nmsg) \
- ((struct rtattr *)(((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
-
-int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
- int alen)
-{
- int len = RTA_LENGTH(alen);
- struct rtattr *rta;
-
- if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
- fprintf(stderr, "addattr_l: message exceeded bound of %d\n",
- maxlen);
- return -1;
- }
- rta = NLMSG_TAIL(n);
- rta->rta_type = type;
- rta->rta_len = len;
- memcpy(RTA_DATA(rta), data, alen);
- n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
- return 0;
-}
-
-void printfilter(const void *data)
-{
- struct can_filter *filter = (struct can_filter *)data;
-
- printf("-f %03X:%X ", filter->can_id, filter->can_mask);
-}
-
-void printmod(const char *type, const void *data)
-{
- struct modattr mod;
- int i;
-
- memcpy (&mod, data, CGW_MODATTR_LEN);
-
- printf("-m %s:", type);
-
- if (mod.modtype & CGW_MOD_ID)
- printf("I");
-
- if (mod.modtype & CGW_MOD_DLC)
- printf("L");
-
- if (mod.modtype & CGW_MOD_DATA)
- printf("D");
-
- printf(":%03X.%X.", mod.cf.can_id, mod.cf.can_dlc);
-
- for (i = 0; i < 8; i++)
- printf("%02X", mod.cf.data[i]);
-
- printf(" ");
-}
-
-void print_cs_xor(struct cgw_csum_xor *cs_xor)
-{
- printf("-x %d:%d:%d:%02X ",
- cs_xor->from_idx, cs_xor->to_idx,
- cs_xor->result_idx, cs_xor->init_xor_val);
-}
-
-void print_cs_crc8_profile(struct cgw_csum_crc8 *cs_crc8)
-{
- int i;
-
- printf("-p %d:", cs_crc8->profile);
-
- switch (cs_crc8->profile) {
-
- case CGW_CRC8PRF_1U8:
-
- printf("%02X", cs_crc8->profile_data[0]);
- break;
-
- case CGW_CRC8PRF_16U8:
-
- for (i = 0; i < 16; i++)
- printf("%02X", cs_crc8->profile_data[i]);
- break;
-
- case CGW_CRC8PRF_SFFID_XOR:
- break;
-
- default:
- printf("<unknown profile #%d>", cs_crc8->profile);
- }
-
- printf(" ");
-}
-
-void print_cs_crc8(struct cgw_csum_crc8 *cs_crc8)
-{
- int i;
-
- printf("-c %d:%d:%d:%02X:%02X:",
- cs_crc8->from_idx, cs_crc8->to_idx,
- cs_crc8->result_idx, cs_crc8->init_crc_val,
- cs_crc8->final_xor_val);
-
- for (i = 0; i < 256; i++)
- printf("%02X", cs_crc8->crctab[i]);
-
- printf(" ");
-
- if (cs_crc8->profile != CGW_CRC8PRF_UNSPEC)
- print_cs_crc8_profile(cs_crc8);
-}
-
-void print_usage(char *prg)
-{
- fprintf(stderr, "\nUsage: %s [options]\n\n", prg);
- fprintf(stderr, "Commands: -A (add a new rule)\n");
- fprintf(stderr, " -D (delete a rule)\n");
- fprintf(stderr, " -F (flush / delete all rules)\n");
- fprintf(stderr, " -L (list all rules)\n");
- fprintf(stderr, "Mandatory: -s <src_dev> (source netdevice)\n");
- fprintf(stderr, " -d <dst_dev> (destination netdevice)\n");
- fprintf(stderr, "Options: -t (preserve src_dev rx timestamp)\n");
- fprintf(stderr, " -e (echo sent frames - recommended on vcanx)\n");
- fprintf(stderr, " -f <filter> (set CAN filter)\n");
- fprintf(stderr, " -m <mod> (set frame modifications)\n");
- fprintf(stderr, " -x <from_idx>:<to_idx>:<result_idx>:<init_xor_val> (XOR checksum)\n");
- fprintf(stderr, " -c <from>:<to>:<result>:<init_val>:<xor_val>:<crctab[256]> (CRC8 cs)\n");
- fprintf(stderr, " -p <profile>:[<profile_data>] (CRC8 checksum profile & parameters)\n");
- fprintf(stderr, "\nValues are given and expected in hexadecimal values. Leading 0s can be omitted.\n");
- fprintf(stderr, "\n");
- fprintf(stderr, "<filter> is a <value><mask> CAN identifier filter\n");
- fprintf(stderr, " <can_id>:<can_mask> (matches when <received_can_id> & mask == can_id & mask)\n");
- fprintf(stderr, " <can_id>~<can_mask> (matches when <received_can_id> & mask != can_id & mask)\n");
- fprintf(stderr, "\n");
- fprintf(stderr, "<mod> is a CAN frame modification instruction consisting of\n");
- fprintf(stderr, "<instruction>:<can_frame-elements>:<can_id>.<can_dlc>.<can_data>\n");
- fprintf(stderr, " - <instruction> is one of 'AND' 'OR' 'XOR' 'SET'\n");
- fprintf(stderr, " - <can_frame-elements> is _one_ or _more_ of 'I'dentifier 'L'ength 'D'ata\n");
- fprintf(stderr, " - <can_id> is an u32 value containing the CAN Identifier\n");
- fprintf(stderr, " - <can_dlc> is an u8 value containing the data length code (0 .. 8)\n");
- fprintf(stderr, " - <can_data> is always eight(!) u8 values containing the CAN frames data\n");
- fprintf(stderr, "The max. four modifications are performed in the order AND -> OR -> XOR -> SET\n");
- fprintf(stderr, "\n");
- fprintf(stderr, "Example:\n");
- fprintf(stderr, "%s -A -s can0 -d vcan3 -e -f 123:C00007FF -m SET:IL:333.4.1122334455667788\n", prg);
- fprintf(stderr, "\n");
- fprintf(stderr, "Supported CRC 8 profiles:\n");
- fprintf(stderr, "Profile '%d' (1U8) - add one additional u8 value\n", CGW_CRC8PRF_1U8);
- fprintf(stderr, "Profile '%d' (16U8) - add u8 value from table[16] indexed by (data[1] & 0xF)\n", CGW_CRC8PRF_16U8);
- fprintf(stderr, "Profile '%d' (SFFID_XOR) - add u8 value (can_id & 0xFF) ^ (can_id >> 8 & 0xFF)\n", CGW_CRC8PRF_SFFID_XOR);
- fprintf(stderr, "\n");
-}
-
-int b64hex(char *asc, unsigned char *bin, int len)
-{
- int i;
-
- for (i = 0; i < len; i++) {
- if (!sscanf(asc+(i*2), "%2hhx", bin+i))
- return 1;
- }
- return 0;
-}
-
-int parse_crc8_profile(char *optarg, struct cgw_csum_crc8 *crc8)
-{
- int ret = 1;
- char *ptr;
-
- if (sscanf(optarg, "%hhd:", &crc8->profile) != 1)
- return ret;
-
- switch (crc8->profile) {
-
- case CGW_CRC8PRF_1U8:
-
- if (sscanf(optarg, "%hhd:%2hhx", &crc8->profile, &crc8->profile_data[0]) == 2)
- ret = 0;
-
- break;
-
- case CGW_CRC8PRF_16U8:
-
- ptr = strchr(optarg, ':');
-
- /* check if length contains 16 base64 hex values */
- if (ptr != NULL &&
- strlen(ptr) == strlen(":00112233445566778899AABBCCDDEEFF") &&
- b64hex(ptr+1, (unsigned char *)&crc8->profile_data[0], 16) == 0)
- ret = 0;
-
- break;
-
- case CGW_CRC8PRF_SFFID_XOR:
-
- /* no additional parameters needed */
- ret = 0;
- break;
- }
-
- return ret;
-}
-
-int parse_mod(char *optarg, struct modattr *modmsg)
-{
- char *ptr, *nptr;
- char hexdata[17] = {0};
-
- ptr = optarg;
- nptr = strchr(ptr, ':');
-
- if ((nptr - ptr > 3) || (nptr - ptr == 0))
- return 1;
-
- if (!strncmp(ptr, "AND", 3))
- modmsg->instruction = CGW_MOD_AND;
- else if (!strncmp(ptr, "OR", 2))
- modmsg->instruction = CGW_MOD_OR;
- else if (!strncmp(ptr, "XOR", 3))
- modmsg->instruction = CGW_MOD_XOR;
- else if (!strncmp(ptr, "SET", 3))
- modmsg->instruction = CGW_MOD_SET;
- else
- return 2;
-
- ptr = nptr+1;
- nptr = strchr(ptr, ':');
-
- if ((nptr - ptr > 3) || (nptr - ptr == 0))
- return 3;
-
- modmsg->modtype = 0;
-
- while (*ptr != ':') {
-
- switch (*ptr) {
-
- case 'I':
- modmsg->modtype |= CGW_MOD_ID;
- break;
-
- case 'L':
- modmsg->modtype |= CGW_MOD_DLC;
- break;
-
- case 'D':
- modmsg->modtype |= CGW_MOD_DATA;
- break;
-
- default:
- return 4;
- }
- ptr++;
- }
-
- if (sscanf(++ptr, "%x.%hhx.%16s", &modmsg->cf.can_id,
- (unsigned char *)&modmsg->cf.can_dlc, hexdata) != 3)
- return 5;
-
- /* 4-bit masks can have values from 0 to 0xF */
- if (modmsg->cf.can_dlc > 0xF)
- return 6;
-
- /* but when setting CAN_DLC the value has to be limited to 8 */
- if (modmsg->instruction == CGW_MOD_SET && modmsg->cf.can_dlc > 8)
- return 7;
-
- if (strlen(hexdata) != 16)
- return 8;
-
- if (b64hex(hexdata, &modmsg->cf.data[0], 8))
- return 9;
-
- return 0; /* ok */
-}
-
-int parse_rtlist(char *prgname, unsigned char *rxbuf, int len)
-{
- char ifname[IF_NAMESIZE]; /* internface name for if_indextoname() */
- struct rtcanmsg *rtc;
- struct rtattr *rta;
- struct nlmsghdr *nlh;
- unsigned int src_ifindex = 0;
- unsigned int dst_ifindex = 0;
- __u32 handled, dropped;
- int rtlen;
-
-
- nlh = (struct nlmsghdr *)rxbuf;
-
- while (1) {
- if (!NLMSG_OK(nlh, len))
- return 0;
-
- if (nlh->nlmsg_type == NLMSG_ERROR) {
- printf("NLMSG_ERROR\n");
- return 1;
- }
-
- if (nlh->nlmsg_type == NLMSG_DONE) {
- //printf("NLMSG_DONE\n");
- return 1;
- }
-
- rtc = (struct rtcanmsg *)NLMSG_DATA(nlh);
- if (rtc->can_family != AF_CAN) {
- printf("received msg from unknown family %d\n", rtc->can_family);
- return -EINVAL;
- }
-
- if (rtc->gwtype != CGW_TYPE_CAN_CAN) {
- printf("received msg with unknown gwtype %d\n", rtc->gwtype);
- return -EINVAL;
- }
-
- /*
- * print list in a representation that
- * can be used directly for start scripts.
- *
- * To order the mandatory and optional parameters in the
- * output string, the NLMSG is parsed twice.
- */
-
- handled = 0;
- dropped = 0;
- src_ifindex = 0;
- dst_ifindex = 0;
-
- printf("%s -A ", basename(prgname));
-
- /* first parse for mandatory options */
- rta = (struct rtattr *) RTCAN_RTA(rtc);
- rtlen = RTCAN_PAYLOAD(nlh);
- for(;RTA_OK(rta, rtlen);rta=RTA_NEXT(rta,rtlen))
- {
- //printf("(A-%d)", rta->rta_type);
- switch(rta->rta_type) {
-
- case CGW_FILTER:
- case CGW_MOD_AND:
- case CGW_MOD_OR:
- case CGW_MOD_XOR:
- case CGW_MOD_SET:
- case CGW_CS_XOR:
- case CGW_CS_CRC8:
- break;
-
- case CGW_SRC_IF:
- src_ifindex = *(__u32 *)RTA_DATA(rta);
- break;
-
- case CGW_DST_IF:
- dst_ifindex = *(__u32 *)RTA_DATA(rta);
- break;
-
- case CGW_HANDLED:
- handled = *(__u32 *)RTA_DATA(rta);
- break;
-
- case CGW_DROPPED:
- dropped = *(__u32 *)RTA_DATA(rta);
- break;
-
- default:
- printf("Unknown attribute %d!", rta->rta_type);
- return -EINVAL;
- break;
- }
- }
-
-
- printf("-s %s ", if_indextoname(src_ifindex, ifname));
- printf("-d %s ", if_indextoname(dst_ifindex, ifname));
-
- if (rtc->flags & CGW_FLAGS_CAN_ECHO)
- printf("-e ");
-
- if (rtc->flags & CGW_FLAGS_CAN_SRC_TSTAMP)
- printf("-t ");
-
- /* second parse for mod attributes */
- rta = (struct rtattr *) RTCAN_RTA(rtc);
- rtlen = RTCAN_PAYLOAD(nlh);
- for(;RTA_OK(rta, rtlen);rta=RTA_NEXT(rta,rtlen))
- {
- //printf("(B-%d)", rta->rta_type);
- switch(rta->rta_type) {
-
- case CGW_FILTER:
- printfilter(RTA_DATA(rta));
- break;
-
- case CGW_MOD_AND:
- printmod("AND", RTA_DATA(rta));
- break;
-
- case CGW_MOD_OR:
- printmod("OR", RTA_DATA(rta));
- break;
-
- case CGW_MOD_XOR:
- printmod("XOR", RTA_DATA(rta));
- break;
-
- case CGW_MOD_SET:
- printmod("SET", RTA_DATA(rta));
- break;
-
- case CGW_CS_XOR:
- print_cs_xor((struct cgw_csum_xor *)RTA_DATA(rta));
- break;
-
- case CGW_CS_CRC8:
- print_cs_crc8((struct cgw_csum_crc8 *)RTA_DATA(rta));
- break;
-
- case CGW_SRC_IF:
- case CGW_DST_IF:
- case CGW_HANDLED:
- case CGW_DROPPED:
- break;
-
- default:
- printf("Unknown attribute %d!", rta->rta_type);
- return -EINVAL;
- break;
- }
- }
-
- printf("# %d handled %d dropped\n", handled, dropped); /* end of entry */
-
- /* jump to next NLMSG in the given buffer */
- nlh = NLMSG_NEXT(nlh, len);
- }
-}
-
-int read_addr_port( char* in, struct in_addr* addr, unsigned short* port )
-{
- char* delim = NULL;
- char addrstr[16];
- int addrlen;
-
- if( (delim = strchr( in, ':' )) == NULL )
- {
- fprintf( stderr, "error: ':'\n" );
- return -1;
- }
-
- /* get address */
- addrlen = delim - in;
- memcpy( addrstr, in, addrlen );
- addrstr[addrlen] = '\0';
- if( inet_aton( addrstr, addr ) == 0 )
- {
- fprintf( stderr, "error: aton\n" );
- return -1;
- }
-
- /* get port */
- if( sscanf( delim, ":%hu", port ) != 1 ) /* todo: handle overflow */
- {
- fprintf( stderr, "error: port\n" );
- return -1;
- }
-
- return 0;
-}
-
-int main(int argc, char **argv)
-{
- int s;
- int err = 0;
-
- int opt;
- extern int optind, opterr, optopt;
-
- int cmd = UNSPEC;
- int have_filter = 0;
- int have_cs_xor = 0;
- int have_cs_crc8 = 0;
-
- struct {
- struct nlmsghdr nh;
- struct rtcanmsg rtcan;
- char buf[600]; /* enough? */
-
- } req;
-
- unsigned char rxbuf[8192]; /* netlink receive buffer */
- struct nlmsghdr *nlh;
- struct nlmsgerr *rte;
- unsigned int src_ifindex = 0;
- unsigned int dst_ifindex = 0;
- /**/
- struct in_addr src_addr, dst_addr;
- unsigned short src_port, dst_port;
-
- __u16 flags = 0;
- int len;
-
- struct can_filter filter;
- struct sockaddr_nl nladdr;
-
- struct cgw_csum_xor cs_xor;
- struct cgw_csum_crc8 cs_crc8;
- char crc8tab[513] = {0};
-
- struct modattr modmsg[CGW_MOD_FUNCS];
- int modidx = 0;
- int i;
-
- memset(&req, 0, sizeof(req));
- memset(&cs_xor, 0, sizeof(cs_xor));
- memset(&cs_crc8, 0, sizeof(cs_crc8));
-
- while ((opt = getopt(argc, argv, "ADFLs:d:tef:c:p:x:m:?")) != -1) {
- switch (opt) {
-
- case 'A':
- if (cmd == UNSPEC)
- cmd = ADD;
- break;
-
- case 'D':
- if (cmd == UNSPEC)
- cmd = DEL;
- break;
-
- case 'F':
- if (cmd == UNSPEC)
- cmd = FLUSH;
- break;
-
- case 'L':
- if (cmd == UNSPEC)
- cmd = LIST;
- break;
-
- case 's':
- //src_ifindex = if_nametoindex(optarg);
- read_addr_port( optarg, &src_addr, &src_port );
- break;
-
- case 'd':
- //dst_ifindex = if_nametoindex(optarg);
- read_addr_port( optarg, &dst_addr, &dst_port );
- break;
-
- case 't':
- flags |= CGW_FLAGS_CAN_SRC_TSTAMP;
- break;
-
- case 'e':
- flags |= CGW_FLAGS_CAN_ECHO;
- break;
-
- case 'f':
- if (sscanf(optarg, "%x:%x", &filter.can_id,
- &filter.can_mask) == 2) {
- have_filter = 1;
- } else if (sscanf(optarg, "%x~%x", &filter.can_id,
- &filter.can_mask) == 2) {
- filter.can_id |= CAN_INV_FILTER;
- have_filter = 1;
- } else {
- printf("Bad filter definition '%s'.\n", optarg);
- exit(1);
- }
- break;
-
- case 'x':
- if (sscanf(optarg, "%hhd:%hhd:%hhd:%hhx",
- &cs_xor.from_idx, &cs_xor.to_idx,
- &cs_xor.result_idx, &cs_xor.init_xor_val) == 4) {
- have_cs_xor = 1;
- } else {
- printf("Bad XOR checksum definition '%s'.\n", optarg);
- exit(1);
- }
- break;
-
- case 'c':
- if ((sscanf(optarg, "%hhd:%hhd:%hhd:%hhx:%hhx:%512s",
- &cs_crc8.from_idx, &cs_crc8.to_idx,
- &cs_crc8.result_idx, &cs_crc8.init_crc_val,
- &cs_crc8.final_xor_val, crc8tab) == 6) &&
- (strlen(crc8tab) == 512) &&
- (b64hex(crc8tab, (unsigned char *)&cs_crc8.crctab, 256) == 0)) {
- have_cs_crc8 = 1;
- } else {
- printf("Bad CRC8 checksum definition '%s'.\n", optarg);
- exit(1);
- }
- break;
-
- case 'p':
- if (parse_crc8_profile(optarg, &cs_crc8)) {
- printf("Bad CRC8 profile definition '%s'.\n", optarg);
- exit(1);
- }
- break;
-
- case 'm':
- /* may be triggered by each of the CGW_MOD_FUNCS functions */
- if ((modidx < CGW_MOD_FUNCS) && (err = parse_mod(optarg, &modmsg[modidx++]))) {
- printf("Problem %d with modification definition '%s'.\n", err, optarg);
- exit(1);
- }
- break;
-
- case '?':
- print_usage(basename(argv[0]));
- exit(0);
- break;
-
- default:
- fprintf(stderr, "Unknown option %c\n", opt);
- print_usage(basename(argv[0]));
- exit(1);
- break;
- }
- }
-
- if ((argc - optind != 0) || (cmd == UNSPEC)) {
- print_usage(basename(argv[0]));
- exit(1);
- }
-
- /* uncomment
- if ((cmd == ADD || cmd == DEL) &&
- ((!src_ifindex) || (!dst_ifindex))) {
- print_usage(basename(argv[0]));
- exit(1);
- }
- */
-
- s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-
- switch (cmd) {
-
- case ADD:
- req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- req.nh.nlmsg_type = RTM_NEWROUTE;
- break;
-
- case DEL:
- req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- req.nh.nlmsg_type = RTM_DELROUTE;
- break;
-
- case FLUSH:
- req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- req.nh.nlmsg_type = RTM_DELROUTE;
- /* if_index set to 0 => remove all entries */
- src_ifindex = 0;
- dst_ifindex = 0;
- break;
-
- case LIST:
- req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
- req.nh.nlmsg_type = RTM_GETROUTE;
- break;
-
- default:
- printf("This function is not yet implemented.\n");
- exit(1);
- break;
- }
-
- req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtcanmsg));
- req.nh.nlmsg_seq = 0;
-
- req.rtcan.can_family = AF_CAN;
- //req.rtcan.gwtype = CGW_TYPE_CAN_CAN;
- req.rtcan.gwtype = CGW_TYPE_CAN_ETH;
- req.rtcan.flags = flags;
-
- //addattr_l(&req.nh, sizeof(req), CGW_SRC_IF, &src_ifindex, sizeof(src_ifindex));
- //addattr_l(&req.nh, sizeof(req), CGW_DST_IF, &dst_ifindex, sizeof(dst_ifindex));
-
- addattr_l( &req.nh, sizeof(req), CGW_SRC_IP , &src_addr, sizeof(src_addr) );
- addattr_l( &req.nh, sizeof(req), CGW_SRC_PORT, &src_port, sizeof(src_port) );
- addattr_l( &req.nh, sizeof(req), CGW_DST_IP , &dst_addr, sizeof(dst_addr) );
- addattr_l( &req.nh, sizeof(req), CGW_DST_PORT, &dst_port, sizeof(dst_port) );
-
- /* add new attributes here */
-
- if (have_filter)
- addattr_l(&req.nh, sizeof(req), CGW_FILTER, &filter, sizeof(filter));
-
- if (have_cs_crc8)
- addattr_l(&req.nh, sizeof(req), CGW_CS_CRC8, &cs_crc8, sizeof(cs_crc8));
-
- if (have_cs_xor)
- addattr_l(&req.nh, sizeof(req), CGW_CS_XOR, &cs_xor, sizeof(cs_xor));
-
- /*
- * a better example code
- * modmsg.modtype = CGW_MOD_ID;
- * addattr_l(&req.n, sizeof(req), CGW_MOD_SET, &modmsg, CGW_MODATTR_LEN);
- */
-
- /* add up to CGW_MOD_FUNCS modification definitions */
- for (i = 0; i < modidx; i++)
- addattr_l(&req.nh, sizeof(req), modmsg[i].instruction, &modmsg[i], CGW_MODATTR_LEN);
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
- nladdr.nl_pid = 0;
- nladdr.nl_groups = 0;
-
- err = sendto(s, &req, req.nh.nlmsg_len, 0,
- (struct sockaddr*)&nladdr, sizeof(nladdr));
- if (err < 0) {
- perror("netlink sendto");
- return err;
- }
-
- /* clean netlink receive buffer */
- memset(rxbuf, 0x0, sizeof(rxbuf));
-
- if (cmd != LIST) {
-
- /*
- * cmd == ADD || cmd == DEL || cmd == FLUSH
- *
- * Parse the requested netlink acknowledge return values.
- */
-
- err = recv(s, &rxbuf, sizeof(rxbuf), 0);
- if (err < 0) {
- perror("netlink recv");
- return err;
- }
- nlh = (struct nlmsghdr *)rxbuf;
- if (nlh->nlmsg_type != NLMSG_ERROR) {
- fprintf(stderr, "unexpected netlink answer of type %d\n", nlh->nlmsg_type);
- return -EINVAL;
- }
- rte = (struct nlmsgerr *)NLMSG_DATA(nlh);
- err = rte->error;
- if (err < 0)
- fprintf(stderr, "netlink error %d (%s)\n", err, strerror(abs(err)));
-
- } else {
-
- /* cmd == LIST */
-
- while (1) {
- len = recv(s, &rxbuf, sizeof(rxbuf), 0);
- if (len < 0) {
- perror("netlink recv");
- return len;
- }
-#if 0
- printf("received msg len %d\n", len);
-
- for (i = 0; i < len; i++)
- printf("%02X ", rxbuf[i]);
-
- printf("\n");
-#endif
- /* leave on errors or NLMSG_DONE */
- if (parse_rtlist(argv[0], rxbuf, len))
- break;
- }
- }
-
- close(s);
-
- return err;
-}
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <libgen.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <libnetlink.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <arpa/inet.h>
+#include <gw.h>
+
+/**
+ * ToDo
+ * - refactor error messages
+ * */
+
+enum {
+ IF_UNDEF,
+ IF_CAN,
+ IF_ETH_UDP
+};
+
+int read_addr_port( char* in, struct in_addr* addr, unsigned short* port )
+{
+ char* delim = NULL;
+ char addrstr[16];
+ int addrlen;
+
+ if( (delim = strchr( in, ':' )) == NULL )
+ {
+ fprintf( stderr, "error: ':'\n" );
+ return -1;
+ }
+
+ /* get address */
+ addrlen = delim - in;
+ memcpy( addrstr, in, addrlen );
+ addrstr[addrlen] = '\0';
+ if( inet_aton( addrstr, addr ) == 0 )
+ {
+ fprintf( stderr, "error: aton\n" );
+ return -1;
+ }
+
+ /* get port */
+ if( sscanf( delim, ":%hu", port ) != 1 ) /* todo: handle overflow */
+ {
+ fprintf( stderr, "error: port\n" );
+ return -1;
+ }
+
+ return 0;
+}
+
+char* read_iftype( char* in, int* iftype )
+{
+ char* ret = in+4;
+
+ if( strncmp( "udp@", optarg, 4 ) == 0 )
+ {
+ *iftype = IF_ETH_UDP;
+ return ret;
+ }
+ else if( strncmp( "tcp@", optarg, 4 ) == 0 )
+ {
+ return NULL;
+ }
+ else if( strncmp( "can@", optarg, 4 ) == 0 )
+ {
+ *iftype = IF_CAN;
+ return ret;
+ }
+
+ return NULL;
+}
+
+int main( int argc, char* argv[] )
+{
+ int s;
+ int src_if = 0, dst_if = 0;
+ int can_ifidx = 0;
+ int tmp = 0;
+ int have_listen = 0;
+ struct in_addr eth_addr;
+ unsigned short eth_port;
+ struct in_addr eth_listen_addr;
+ unsigned short eth_listen_port;
+ char* optstr;
+ char opt;
+ struct sockaddr_nl nladdr;
+ int err = 0;
+
+ struct {
+ struct nlmsghdr nh;
+ struct rtcanmsg rtcan;
+ char buf[600]; /* enough? */
+ } req;
+
+ while( (opt = getopt( argc, argv, "As:d:l:" )) != -1 )
+ {
+ switch( opt )
+ {
+ case 's':
+ if( (optstr = read_iftype( optarg, &src_if )) == NULL )
+ {
+ fprintf( stderr, "error: bad input format\n" );
+ goto syntax_error;
+ break;
+ }
+
+ switch( src_if )
+ {
+ case IF_CAN:
+ can_ifidx = if_nametoindex( optstr );
+ break;
+ case IF_ETH_UDP:
+ read_addr_port( optstr, ð_addr, ð_port );
+ break;
+ default:
+ fprintf( stderr, "error: unrecognized interface" );
+ goto syntax_error;
+ break;
+ }
+ break;
+ case 'd':
+ if( (optstr = read_iftype( optarg, &dst_if )) == NULL )
+ {
+ fprintf( stderr, "error: bad input format\n" );
+ goto syntax_error;
+ break;
+ }
+
+ switch( dst_if )
+ {
+ case IF_CAN:
+ can_ifidx = if_nametoindex( optstr ); /*chk*/
+ break;
+ case IF_ETH_UDP:
+ read_addr_port( optstr, ð_addr, ð_port ); /*chk*/
+ break;
+ default:
+ fprintf( stderr, "error: unrecognized interface" );
+ break;
+ }
+ break;
+ case 'l':
+ if( (optstr = read_iftype( optarg, &tmp )) == NULL )
+ {
+ fprintf( stderr, "error: -l bad input format\n" );
+ goto syntax_error;
+ break;
+ }
+
+ if( tmp != IF_ETH_UDP )
+ {
+ fprintf( stderr, "error: -l bad input format\n" );
+ goto syntax_error;
+ break;
+ }
+
+ read_addr_port( optstr, ð_listen_addr, ð_listen_port ); /*chk*/
+ default:
+ fprintf( stderr, "error: unknown option\n" );
+ break;
+ }
+ }
+
+ /* 2. do check on arguments */
+ if( (src_if == 0 || dst_if == 0) || (src_if == dst_if) )
+ {
+ fprintf( stderr, "error: source or destination not specified\n" );
+ return -1;
+ }
+
+ if( src_if == dst_if )
+ {
+ fprintf( stderr, "error: source and destination same interface type\n" );
+ }
+
+ /* 3. prepare netlink message */
+ req.nh.nlmsg_len = NLMSG_LENGTH( sizeof(struct rtcanmsg) );
+ req.nh.nlmsg_type = RTM_NEWROUTE;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ req.nh.nlmsg_seq = 0;
+ req.nh.nlmsg_pid = 0; /* ? */
+
+ req.rtcan.can_family = AF_CAN;
+ req.rtcan.gwtype = (src_if == IF_CAN) ? CGW_TYPE_CAN_ETH_UDP : CGW_TYPE_ETH_CAN_UDP;
+ req.rtcan.flags = 0;
+
+ addattr_l( &req.nh, sizeof(req), CGW_CAN_IF, &can_ifidx, sizeof(can_ifidx) );
+ switch( req.rtcan.gwtype )
+ {
+ case CGW_TYPE_CAN_ETH_UDP:
+ addattr_l( &req.nh, sizeof(req), CGW_ETH_IP, ð_addr, sizeof(eth_addr) );
+ addattr_l( &req.nh, sizeof(req), CGW_ETH_PORT, ð_port, sizeof(eth_port) );
+ break;
+ case CGW_TYPE_ETH_CAN_UDP:
+ break;
+ default:
+ break;
+ }
+
+ if( have_listen )
+ {
+ addattr_l( &req.nh, sizeof(req), CGW_LISTEN_IP, ð_listen_addr, sizeof(eth_listen_addr) );
+ addattr_l( &req.nh, sizeof(req), CGW_LISTEN_PORT, ð_listen_port, sizeof(eth_listen_port) );
+ }
+
+ /* 4. send over netlink socket */
+ s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); /* chck */
+
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+ nladdr.nl_pid = 0;
+ nladdr.nl_groups = 0;
+
+ err = sendto( s, &req, req.nh.nlmsg_len, 0,
+ (struct sockaddr*)&nladdr, sizeof(nladdr));
+ if (err < 0)
+ {
+ perror( "netlink sendto" );
+ return err;
+ }
+
+ /* ack? */
+
+ return 0;
+syntax_error:
+ return -1;
+}
projects / can-eth-gw.git / commitdiff