--- /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;
+}
projects / can-eth-gw.git / commitdiff