From: David Girault <david.girault@xxxxxxxxx>
Add the possibility to listen to the scan multicast netlink family in
order to print all the events happening in the 802.15.4 stack, like the
discovery of a new coordinator or an end of scan.
Signed-off-by: David Girault <david.girault@xxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
src/Makefile.am | 1 +
src/event.c | 230 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 231 insertions(+)
create mode 100644 src/event.c
diff --git a/src/Makefile.am b/src/Makefile.am
index 18b3569..7933daf 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -10,6 +10,7 @@ iwpan_SOURCES = \
phy.c \
mac.c \
scan.c \
+ event.c \
nl_extras.h \
nl802154.h
diff --git a/src/event.c b/src/event.c
new file mode 100644
index 0000000..5ec597d
--- /dev/null
+++ b/src/event.c
@@ -0,0 +1,230 @@
+#include <net/if.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <inttypes.h>
+
+#include <netlink/genl/genl.h>
+#include <netlink/genl/family.h>
+#include <netlink/genl/ctrl.h>
+#include <netlink/msg.h>
+#include <netlink/attr.h>
+
+#include "nl802154.h"
+#include "nl_extras.h"
+#include "iwpan.h"
+
+struct print_event_args {
+ struct timeval ts; /* internal */
+ bool have_ts; /* must be set false */
+ bool frame, time, reltime;
+};
+
+static int print_event(struct nl_msg *msg, void *arg)
+{
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *tb[NL802154_ATTR_MAX + 1], *nst, *nestedcoord;
+ struct nlattr *pan[NL802154_COORD_MAX + 1];
+ struct print_event_args *args = arg;
+ char ifname[100];
+ static struct nla_policy pan_policy[NL802154_COORD_MAX + 1] = {
+ [NL802154_COORD_PANID] = { .type = NLA_U16, },
+ [NL802154_COORD_ADDR] = { .minlen = 2, .maxlen = 8, }, /* 2 or 8 */
+ };
+ uint8_t reg_type;
+ uint32_t wpan_phy_idx = 0;
+ int rem_nst;
+ uint16_t status;
+ int ret;
+
+ if (args->time || args->reltime) {
+ unsigned long long usecs, previous;
+
+ previous = 1000000ULL * args->ts.tv_sec + args->ts.tv_usec;
+ gettimeofday(&args->ts, NULL);
+ usecs = 1000000ULL * args->ts.tv_sec + args->ts.tv_usec;
+ if (args->reltime) {
+ if (!args->have_ts) {
+ usecs = 0;
+ args->have_ts = true;
+ } else
+ usecs -= previous;
+ }
+ printf("%llu.%06llu: ", usecs/1000000, usecs % 1000000);
+ }
+
+ nla_parse(tb, NL802154_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+
+ if (tb[NL802154_ATTR_IFINDEX] && tb[NL802154_ATTR_WPAN_PHY]) {
+ if_indextoname(nla_get_u32(tb[NL802154_ATTR_IFINDEX]), ifname);
+ printf("%s (phy #%d): ", ifname, nla_get_u32(tb[NL802154_ATTR_WPAN_PHY]));
+ } else if (tb[NL802154_ATTR_WPAN_DEV] && tb[NL802154_ATTR_WPAN_PHY]) {
+ printf("wdev 0x%llx (phy #%d): ",
+ (unsigned long long)nla_get_u64(tb[NL802154_ATTR_WPAN_DEV]),
+ nla_get_u32(tb[NL802154_ATTR_WPAN_PHY]));
+ } else if (tb[NL802154_ATTR_IFINDEX]) {
+ if_indextoname(nla_get_u32(tb[NL802154_ATTR_IFINDEX]), ifname);
+ printf("%s: ", ifname);
+ } else if (tb[NL802154_ATTR_WPAN_DEV]) {
+ printf("wdev 0x%llx: ", (unsigned long long)nla_get_u64(tb[NL802154_ATTR_WPAN_DEV]));
+ } else if (tb[NL802154_ATTR_WPAN_PHY]) {
+ printf("phy #%d: ", nla_get_u32(tb[NL802154_ATTR_WPAN_PHY]));
+ }
+
+ switch (gnlh->cmd) {
+ case NL802154_CMD_NEW_WPAN_PHY:
+ printf("renamed to %s\n", nla_get_string(tb[NL802154_ATTR_WPAN_PHY_NAME]));
+ break;
+ case NL802154_CMD_DEL_WPAN_PHY:
+ printf("delete wpan_phy\n");
+ break;
+ case NL802154_CMD_TRIGGER_SCAN:
+ printf("scan started\n");
+ break;
+ case NL802154_CMD_SCAN_DONE:
+ if (tb[NL802154_ATTR_SCAN_DONE_REASON])
+ status = nla_get_u8(tb[NL802154_ATTR_SCAN_DONE_REASON]);
+ if (status == NL802154_SCAN_DONE_REASON_ABORTED)
+ printf("scan aborted\n");
+ else
+ printf("scan finished\n");
+ break;
+ case NL802154_CMD_ABORT_SCAN:
+ printf("scan aborted\n");
+ break;
+ case NL802154_CMD_SCAN_EVENT:
+ nestedcoord = tb[NL802154_ATTR_COORDINATOR];
+ if (!nestedcoord)
+ break;
+ ret = nla_parse_nested(pan, NL802154_COORD_MAX, nestedcoord, pan_policy);
+ if (ret < 0)
+ break;
+ if (!pan[NL802154_COORD_PANID])
+ break;
+ printf("beacon received: PAN 0x%04x",
+ le16toh(nla_get_u16(pan[NL802154_COORD_PANID])));
+ if (pan[NL802154_COORD_ADDR]) {
+ struct nlattr *coord = pan[NL802154_COORD_ADDR];
+ if (nla_len(coord) == 2) {
+ uint16_t addr = nla_get_u16(coord);
+ printf(", addr 0x%04x\n", le16toh(addr));
+ } else {
+ uint64_t addr = nla_get_u64(coord);
+ printf(", addr 0x%016" PRIx64 "\n", le64toh(addr));
+ }
+ }
+ break;
+ default:
+ printf("unknown event %d\n", gnlh->cmd);
+ break;
+ }
+ fflush(stdout);
+ return NL_SKIP;
+}
+
+static int __prepare_listen_events(struct nl802154_state *state)
+{
+ int mcid, ret;
+
+ /* Configuration multicast group */
+ mcid = genl_ctrl_resolve_grp(state->nl_sock, NL802154_GENL_NAME,
+ "config");
+ if (mcid < 0)
+ return mcid;
+ ret = nl_socket_add_membership(state->nl_sock, mcid);
+ if (ret)
+ return ret;
+
+ /* Scan multicast group */
+ mcid = genl_ctrl_resolve_grp(state->nl_sock, NL802154_GENL_NAME,
+ "scan");
+ if (mcid >= 0) {
+ ret = nl_socket_add_membership(state->nl_sock, mcid);
+ if (ret)
+ return ret;
+ }
+
+ /* MLME multicast group */
+ mcid = genl_ctrl_resolve_grp(state->nl_sock, NL802154_GENL_NAME,
+ "mlme");
+ if (mcid >= 0) {
+ ret = nl_socket_add_membership(state->nl_sock, mcid);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __do_listen_events(struct nl802154_state *state,
+ struct print_event_args *args)
+{
+ struct nl_cb *cb = nl_cb_alloc(iwpan_debug ? NL_CB_DEBUG : NL_CB_DEFAULT);
+ if (!cb) {
+ fprintf(stderr, "failed to allocate netlink callbacks\n");
+ return -ENOMEM;
+ }
+ nl_socket_set_cb(state->nl_sock, cb);
+ /* No sequence checking for multicast messages */
+ nl_socket_disable_seq_check(state->nl_sock);
+ /* Install print_event message handler */
+ nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_event, args);
+
+ /* Loop waiting until interrupted by signal */
+ while (1) {
+ int ret = nl_recvmsgs(state->nl_sock, cb);
+ if (ret) {
+ fprintf(stderr, "nl_recvmsgs return error %d\n", ret);
+ break;
+ }
+ }
+ /* Free allocated nl_cb structure */
+ nl_cb_put(cb);
+ return 0;
+}
+
+static int print_events(struct nl802154_state *state,
+ struct nl_cb *cb,
+ struct nl_msg *msg,
+ int argc, char **argv,
+ enum id_input id)
+{
+ struct print_event_args args;
+ int ret;
+
+ memset(&args, 0, sizeof(args));
+
+ argc--;
+ argv++;
+
+ while (argc > 0) {
+ if (strcmp(argv[0], "-f") == 0)
+ args.frame = true;
+ else if (strcmp(argv[0], "-t") == 0)
+ args.time = true;
+ else if (strcmp(argv[0], "-r") == 0)
+ args.reltime = true;
+ else
+ return 1;
+ argc--;
+ argv++;
+ }
+ if (args.time && args.reltime)
+ return 1;
+ if (argc)
+ return 1;
+
+ /* Prepare reception of all multicast messages */
+ ret = __prepare_listen_events(state);
+ if (ret)
+ return ret;
+
+ /* Read message loop */
+ return __do_listen_events(state, &args);
+}
+TOPLEVEL(monitor, "[-t|-r] [-f]", 0, 0, CIB_NONE, print_events,
+ "Monitor events from the kernel.\n"
+ "-t - print timestamp\n"
+ "-r - print relative timestamp\n"
+ "-f - print full frame for auth/assoc etc.");
--
2.34.1
