summaryrefslogtreecommitdiffstats
path: root/ip/ipnetconf.c
diff options
context:
space:
mode:
Diffstat (limited to 'ip/ipnetconf.c')
-rw-r--r--ip/ipnetconf.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/ip/ipnetconf.c b/ip/ipnetconf.c
new file mode 100644
index 0000000..a0c7e05
--- /dev/null
+++ b/ip/ipnetconf.c
@@ -0,0 +1,247 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * ipnetconf.c "ip netconf".
+ *
+ * Authors: Nicolas Dichtel, <nicolas.dichtel@6wind.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <errno.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+static struct {
+ int family;
+ int ifindex;
+} filter;
+
+static const char * const rp_filter_names[] = {
+ "off", "strict", "loose"
+};
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+ fprintf(stderr, "Usage: ip netconf show [ dev STRING ]\n");
+ exit(-1);
+}
+
+static struct rtattr *netconf_rta(struct netconfmsg *ncm)
+{
+ return (struct rtattr *)((char *)ncm
+ + NLMSG_ALIGN(sizeof(struct netconfmsg)));
+}
+
+int print_netconf(struct rtnl_ctrl_data *ctrl, struct nlmsghdr *n, void *arg)
+{
+ FILE *fp = (FILE *)arg;
+ struct netconfmsg *ncm = NLMSG_DATA(n);
+ int len = n->nlmsg_len;
+ struct rtattr *tb[NETCONFA_MAX+1];
+ int ifindex = 0;
+
+ if (n->nlmsg_type == NLMSG_ERROR)
+ return -1;
+
+ if (n->nlmsg_type != RTM_NEWNETCONF &&
+ n->nlmsg_type != RTM_DELNETCONF) {
+ fprintf(stderr, "Not a netconf message: %08x %08x %08x\n",
+ n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
+
+ return -1;
+ }
+ len -= NLMSG_SPACE(sizeof(*ncm));
+ if (len < 0) {
+ fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+ return -1;
+ }
+
+ if (filter.family && filter.family != ncm->ncm_family)
+ return 0;
+
+ parse_rtattr(tb, NETCONFA_MAX, netconf_rta(ncm),
+ NLMSG_PAYLOAD(n, sizeof(*ncm)));
+
+ if (tb[NETCONFA_IFINDEX])
+ ifindex = rta_getattr_u32(tb[NETCONFA_IFINDEX]);
+
+ if (filter.ifindex && filter.ifindex != ifindex)
+ return 0;
+
+ open_json_object(NULL);
+ if (n->nlmsg_type == RTM_DELNETCONF)
+ print_bool(PRINT_ANY, "deleted", "Deleted ", true);
+
+ print_string(PRINT_ANY, "family",
+ "%s ", family_name(ncm->ncm_family));
+
+ if (tb[NETCONFA_IFINDEX]) {
+ const char *dev;
+
+ switch (ifindex) {
+ case NETCONFA_IFINDEX_ALL:
+ dev = "all";
+ break;
+ case NETCONFA_IFINDEX_DEFAULT:
+ dev = "default";
+ break;
+ default:
+ dev = ll_index_to_name(ifindex);
+ break;
+ }
+ print_color_string(PRINT_ANY, COLOR_IFNAME,
+ "interface", "%s ", dev);
+ }
+
+ if (tb[NETCONFA_FORWARDING])
+ print_on_off(PRINT_ANY, "forwarding", "forwarding %s ",
+ rta_getattr_u32(tb[NETCONFA_FORWARDING]));
+
+ if (tb[NETCONFA_RP_FILTER]) {
+ __u32 rp_filter = rta_getattr_u32(tb[NETCONFA_RP_FILTER]);
+
+ if (rp_filter < ARRAY_SIZE(rp_filter_names))
+ print_string(PRINT_ANY, "rp_filter",
+ "rp_filter %s ",
+ rp_filter_names[rp_filter]);
+ else
+ print_uint(PRINT_ANY, "rp_filter",
+ "rp_filter %u ", rp_filter);
+ }
+
+ if (tb[NETCONFA_MC_FORWARDING])
+ print_on_off(PRINT_ANY, "mc_forwarding", "mc_forwarding %s ",
+ rta_getattr_u32(tb[NETCONFA_MC_FORWARDING]));
+
+ if (tb[NETCONFA_PROXY_NEIGH])
+ print_on_off(PRINT_ANY, "proxy_neigh", "proxy_neigh %s ",
+ rta_getattr_u32(tb[NETCONFA_PROXY_NEIGH]));
+
+ if (tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN])
+ print_on_off(PRINT_ANY, "ignore_routes_with_linkdown",
+ "ignore_routes_with_linkdown %s ",
+ rta_getattr_u32(tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]));
+
+ if (tb[NETCONFA_INPUT])
+ print_on_off(PRINT_ANY, "input", "input %s ",
+ rta_getattr_u32(tb[NETCONFA_INPUT]));
+
+ close_json_object();
+ print_string(PRINT_FP, NULL, "\n", NULL);
+ fflush(fp);
+ return 0;
+}
+
+static int print_netconf2(struct nlmsghdr *n, void *arg)
+{
+ return print_netconf(NULL, n, arg);
+}
+
+void ipnetconf_reset_filter(int ifindex)
+{
+ memset(&filter, 0, sizeof(filter));
+ filter.ifindex = ifindex;
+}
+
+static int do_show(int argc, char **argv)
+{
+ struct {
+ struct nlmsghdr n;
+ struct netconfmsg ncm;
+ char buf[1024];
+ } req = {
+ .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct netconfmsg)),
+ .n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
+ .n.nlmsg_type = RTM_GETNETCONF,
+ };
+
+ ipnetconf_reset_filter(0);
+ filter.family = preferred_family;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ filter.ifindex = ll_name_to_index(*argv);
+ if (filter.ifindex <= 0) {
+ fprintf(stderr,
+ "Device \"%s\" does not exist.\n",
+ *argv);
+ return -1;
+ }
+ }
+ argv++; argc--;
+ }
+
+ ll_init_map(&rth);
+
+ if (filter.ifindex && filter.family != AF_UNSPEC) {
+ req.ncm.ncm_family = filter.family;
+ addattr_l(&req.n, sizeof(req), NETCONFA_IFINDEX,
+ &filter.ifindex, sizeof(filter.ifindex));
+
+ if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
+ perror("Can not send request");
+ exit(1);
+ }
+ if (rtnl_listen(&rth, print_netconf, stdout) < 0)
+ exit(2);
+ } else {
+ rth.flags = RTNL_HANDLE_F_SUPPRESS_NLERR;
+dump:
+ if (rtnl_netconfdump_req(&rth, filter.family) < 0) {
+ perror("Cannot send dump request");
+ exit(1);
+ }
+
+ new_json_obj(json);
+ if (rtnl_dump_filter(&rth, print_netconf2, stdout) < 0) {
+ /* kernel does not support netconf dump on AF_UNSPEC;
+ * fall back to requesting by family
+ */
+ if (errno == EOPNOTSUPP &&
+ filter.family == AF_UNSPEC) {
+ delete_json_obj();
+ filter.family = AF_INET;
+ goto dump;
+ }
+ perror("RTNETLINK answers");
+ fprintf(stderr, "Dump terminated\n");
+ exit(1);
+ }
+ delete_json_obj();
+ if (preferred_family == AF_UNSPEC && filter.family == AF_INET) {
+ preferred_family = AF_INET6;
+ filter.family = AF_INET6;
+ goto dump;
+ }
+ }
+ return 0;
+}
+
+int do_ipnetconf(int argc, char **argv)
+{
+ if (argc > 0) {
+ if (matches(*argv, "show") == 0 ||
+ matches(*argv, "lst") == 0 ||
+ matches(*argv, "list") == 0)
+ return do_show(argc-1, argv+1);
+ if (matches(*argv, "help") == 0)
+ usage();
+ } else
+ return do_show(0, NULL);
+
+ fprintf(stderr,
+ "Command \"%s\" is unknown, try \"ip netconf help\".\n",
+ *argv);
+ exit(-1);
+}