blob: 30ea4d704df43f851c2d0682a9af2f4886b6e6a0 [file] [log] [blame]
/*
* ctrl.c generic netlink controller
*
* This program is free software; you can distribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: J Hadi Salim (hadi@cyberus.ca)
* Johannes Berg (johannes@sipsolutions.net)
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include "utils.h"
#include "genl_utils.h"
#define GENL_MAX_FAM_OPS 256
#define GENL_MAX_FAM_GRPS 256
static int usage(void)
{
fprintf(stderr,"Usage: ctrl <CMD>\n" \
"CMD := get <PARMS> | list | monitor\n" \
"PARMS := name <name> | id <id>\n" \
"Examples:\n" \
"\tctrl ls\n" \
"\tctrl monitor\n" \
"\tctrl get name foobar\n" \
"\tctrl get id 0xF\n");
return -1;
}
int genl_ctrl_resolve_family(const char *family)
{
struct rtnl_handle rth;
struct nlmsghdr *nlh;
struct genlmsghdr *ghdr;
int ret = 0;
struct {
struct nlmsghdr n;
char buf[4096];
} req;
memset(&req, 0, sizeof(req));
nlh = &req.n;
nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
nlh->nlmsg_type = GENL_ID_CTRL;
ghdr = NLMSG_DATA(&req.n);
ghdr->cmd = CTRL_CMD_GETFAMILY;
if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) {
fprintf(stderr, "Cannot open generic netlink socket\n");
exit(1);
}
addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, family, strlen(family) + 1);
if (rtnl_talk(&rth, nlh, 0, 0, nlh, NULL, NULL) < 0) {
fprintf(stderr, "Error talking to the kernel\n");
goto errout;
}
{
struct rtattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr *ghdr = NLMSG_DATA(nlh);
int len = nlh->nlmsg_len;
struct rtattr *attrs;
if (nlh->nlmsg_type != GENL_ID_CTRL) {
fprintf(stderr, "Not a controller message, nlmsg_len=%d "
"nlmsg_type=0x%x\n", nlh->nlmsg_len, nlh->nlmsg_type);
goto errout;
}
if (ghdr->cmd != CTRL_CMD_NEWFAMILY) {
fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd);
goto errout;
}
len -= NLMSG_LENGTH(GENL_HDRLEN);
if (len < 0) {
fprintf(stderr, "wrong controller message len %d\n", len);
return -1;
}
attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN);
parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len);
if (tb[CTRL_ATTR_FAMILY_ID] == NULL) {
fprintf(stderr, "Missing family id TLV\n");
goto errout;
}
ret = *(__u16 *) RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]);
}
errout:
rtnl_close(&rth);
return ret;
}
void print_ctrl_cmd_flags(FILE *fp, __u32 fl)
{
fprintf(fp, "\n\t\tCapabilities (0x%x):\n ", fl);
if (!fl) {
fprintf(fp, "\n");
return;
}
fprintf(fp, "\t\t ");
if (fl & GENL_ADMIN_PERM)
fprintf(fp, " requires admin permission;");
if (fl & GENL_CMD_CAP_DO)
fprintf(fp, " can doit;");
if (fl & GENL_CMD_CAP_DUMP)
fprintf(fp, " can dumpit;");
if (fl & GENL_CMD_CAP_HASPOL)
fprintf(fp, " has policy");
fprintf(fp, "\n");
}
static int print_ctrl_cmds(FILE *fp, struct rtattr *arg, __u32 ctrl_ver)
{
struct rtattr *tb[CTRL_ATTR_OP_MAX + 1];
if (arg == NULL)
return -1;
parse_rtattr_nested(tb, CTRL_ATTR_OP_MAX, arg);
if (tb[CTRL_ATTR_OP_ID]) {
__u32 *id = RTA_DATA(tb[CTRL_ATTR_OP_ID]);
fprintf(fp, " ID-0x%x ",*id);
}
/* we are only gonna do this for newer version of the controller */
if (tb[CTRL_ATTR_OP_FLAGS] && ctrl_ver >= 0x2) {
__u32 *fl = RTA_DATA(tb[CTRL_ATTR_OP_FLAGS]);
print_ctrl_cmd_flags(fp, *fl);
}
return 0;
}
static int print_ctrl_grp(FILE *fp, struct rtattr *arg, __u32 ctrl_ver)
{
struct rtattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1];
if (arg == NULL)
return -1;
parse_rtattr_nested(tb, CTRL_ATTR_MCAST_GRP_MAX, arg);
if (tb[2]) {
__u32 *id = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_ID]);
fprintf(fp, " ID-0x%x ",*id);
}
if (tb[1]) {
char *name = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_NAME]);
fprintf(fp, " name: %s ", name);
}
return 0;
}
/*
* The controller sends one nlmsg per family
*/
static int print_ctrl(const struct sockaddr_nl *who, struct nlmsghdr *n,
void *arg)
{
struct rtattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr *ghdr = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *attrs;
FILE *fp = (FILE *) arg;
__u32 ctrl_v = 0x1;
if (n->nlmsg_type != GENL_ID_CTRL) {
fprintf(stderr, "Not a controller message, nlmsg_len=%d "
"nlmsg_type=0x%x\n", n->nlmsg_len, n->nlmsg_type);
return 0;
}
if (ghdr->cmd != CTRL_CMD_GETFAMILY &&
ghdr->cmd != CTRL_CMD_DELFAMILY &&
ghdr->cmd != CTRL_CMD_NEWFAMILY &&
ghdr->cmd != CTRL_CMD_NEWMCAST_GRP &&
ghdr->cmd != CTRL_CMD_DELMCAST_GRP) {
fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd);
return 0;
}
len -= NLMSG_LENGTH(GENL_HDRLEN);
if (len < 0) {
fprintf(stderr, "wrong controller message len %d\n", len);
return -1;
}
attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN);
parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len);
if (tb[CTRL_ATTR_FAMILY_NAME]) {
char *name = RTA_DATA(tb[CTRL_ATTR_FAMILY_NAME]);
fprintf(fp, "\nName: %s\n",name);
}
if (tb[CTRL_ATTR_FAMILY_ID]) {
__u16 *id = RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]);
fprintf(fp, "\tID: 0x%x ",*id);
}
if (tb[CTRL_ATTR_VERSION]) {
__u32 *v = RTA_DATA(tb[CTRL_ATTR_VERSION]);
fprintf(fp, " Version: 0x%x ",*v);
ctrl_v = *v;
}
if (tb[CTRL_ATTR_HDRSIZE]) {
__u32 *h = RTA_DATA(tb[CTRL_ATTR_HDRSIZE]);
fprintf(fp, " header size: %d ",*h);
}
if (tb[CTRL_ATTR_MAXATTR]) {
__u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]);
fprintf(fp, " max attribs: %d ",*ma);
}
/* end of family definitions .. */
fprintf(fp,"\n");
if (tb[CTRL_ATTR_OPS]) {
struct rtattr *tb2[GENL_MAX_FAM_OPS];
int i=0;
parse_rtattr_nested(tb2, GENL_MAX_FAM_OPS, tb[CTRL_ATTR_OPS]);
fprintf(fp, "\tcommands supported: \n");
for (i = 0; i < GENL_MAX_FAM_OPS; i++) {
if (tb2[i]) {
fprintf(fp, "\t\t#%d: ", i);
if (0 > print_ctrl_cmds(fp, tb2[i], ctrl_v)) {
fprintf(fp, "Error printing command\n");
}
/* for next command */
fprintf(fp,"\n");
}
}
/* end of family::cmds definitions .. */
fprintf(fp,"\n");
}
if (tb[CTRL_ATTR_MCAST_GROUPS]) {
struct rtattr *tb2[GENL_MAX_FAM_GRPS + 1];
int i;
parse_rtattr_nested(tb2, GENL_MAX_FAM_GRPS,
tb[CTRL_ATTR_MCAST_GROUPS]);
fprintf(fp, "\tmulticast groups:\n");
for (i = 0; i < GENL_MAX_FAM_GRPS; i++) {
if (tb2[i]) {
fprintf(fp, "\t\t#%d: ", i);
if (0 > print_ctrl_grp(fp, tb2[i], ctrl_v))
fprintf(fp, "Error printing group\n");
/* for next group */
fprintf(fp,"\n");
}
}
/* end of family::groups definitions .. */
fprintf(fp,"\n");
}
fflush(fp);
return 0;
}
static int ctrl_list(int cmd, int argc, char **argv)
{
struct rtnl_handle rth;
struct nlmsghdr *nlh;
struct genlmsghdr *ghdr;
int ret = -1;
char d[GENL_NAMSIZ];
struct {
struct nlmsghdr n;
char buf[4096];
} req;
memset(&req, 0, sizeof(req));
nlh = &req.n;
nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
nlh->nlmsg_type = GENL_ID_CTRL;
ghdr = NLMSG_DATA(&req.n);
ghdr->cmd = CTRL_CMD_GETFAMILY;
if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) {
fprintf(stderr, "Cannot open generic netlink socket\n");
exit(1);
}
if (cmd == CTRL_CMD_GETFAMILY) {
if (argc != 2) {
fprintf(stderr, "Wrong number of params\n");
return -1;
}
if (matches(*argv, "name") == 0) {
NEXT_ARG();
strncpy(d, *argv, sizeof (d) - 1);
addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME,
d, strlen(d) + 1);
} else if (matches(*argv, "id") == 0) {
__u16 id;
NEXT_ARG();
if (get_u16(&id, *argv, 0)) {
fprintf(stderr, "Illegal \"id\"\n");
goto ctrl_done;
}
addattr_l(nlh, 128, CTRL_ATTR_FAMILY_ID, &id, 2);
} else {
fprintf(stderr, "Wrong params\n");
goto ctrl_done;
}
if (rtnl_talk(&rth, nlh, 0, 0, nlh, NULL, NULL) < 0) {
fprintf(stderr, "Error talking to the kernel\n");
goto ctrl_done;
}
if (print_ctrl(NULL, nlh, (void *) stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
goto ctrl_done;
}
}
if (cmd == CTRL_CMD_UNSPEC) {
nlh->nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
nlh->nlmsg_seq = rth.dump = ++rth.seq;
if (rtnl_send(&rth, (const char *) nlh, nlh->nlmsg_len) < 0) {
perror("Failed to send dump request\n");
goto ctrl_done;
}
rtnl_dump_filter(&rth, print_ctrl, stdout, NULL, NULL);
}
ret = 0;
ctrl_done:
rtnl_close(&rth);
return ret;
}
static int ctrl_listen(int argc, char **argv)
{
struct rtnl_handle rth;
if (rtnl_open_byproto(&rth, nl_mgrp(GENL_ID_CTRL), NETLINK_GENERIC) < 0) {
fprintf(stderr, "Canot open generic netlink socket\n");
return -1;
}
if (rtnl_listen(&rth, print_ctrl, (void *) stdout) < 0)
return -1;
return 0;
}
static int parse_ctrl(struct genl_util *a, int argc, char **argv)
{
argv++;
if (--argc <= 0) {
fprintf(stderr, "wrong controller params\n");
return -1;
}
if (matches(*argv, "monitor") == 0)
return ctrl_listen(argc-1, argv+1);
if (matches(*argv, "get") == 0)
return ctrl_list(CTRL_CMD_GETFAMILY, argc-1, argv+1);
if (matches(*argv, "list") == 0 ||
matches(*argv, "show") == 0 ||
matches(*argv, "lst") == 0)
return ctrl_list(CTRL_CMD_UNSPEC, argc-1, argv+1);
if (matches(*argv, "help") == 0)
return usage();
fprintf(stderr, "ctrl command \"%s\" is unknown, try \"ctrl -help\".\n",
*argv);
return -1;
}
struct genl_util ctrl_genl_util = {
.name = "ctrl",
.parse_genlopt = parse_ctrl,
.print_genlopt = print_ctrl,
};