diff mbox series

[4/4] batctl: add netlink dump function for multicast flags table

Message ID 20180227081059.13234-4-linus.luessing@c0d3.blue
State Superseded, archived
Delegated to: Simon Wunderlich
Headers show
Series [1/4] batctl: add DAT cache netlink support | expand

Commit Message

Linus Lüssing Feb. 27, 2018, 8:10 a.m. UTC
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
 debug.c   |   1 +
 netlink.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 netlink.h |   2 +
 3 files changed, 146 insertions(+)

Comments

Sven Eckelmann March 4, 2018, 4:52 p.m. UTC | #1
On Dienstag, 27. Februar 2018 09:10:59 CET Linus Lüssing wrote:
> +       /* only parse own multicast flags */
> +       info_header = netlink_get_info(ifindex, BATADV_CMD_GET_MCAST_FLAGS, NULL);
> +       free(info_header);
> +
> +       if (mcast_flags < 0 || mcast_flags_priv < 0)
> +               return -EINVAL;

Let us assume for now that the kernel doesn't yet support the netlink
mcast_flags and the rest of the mcast netlink code. It will now try to get the 
mcast_flags from the kernel and fail. Thsi function is now returning -EINVAL 
and handle_debug_table will now compare the return code to -EOPNOTSUPP and 
notice that a different error happened and stops the processing. Would be nice 
when it would not really stop and instead try to get the data from debugfs (via
the old code which is still in batctl).

Kind regards,
	Sven
diff mbox series

Patch

diff --git a/debug.c b/debug.c
index 5f9a87b..63fb633 100644
--- a/debug.c
+++ b/debug.c
@@ -100,6 +100,7 @@  const struct debug_table_data batctl_debug_tables[BATCTL_TABLE_NUM] = {
 		.opt_short = "mf",
 		.debugfs_name = "mcast_flags",
 		.header_lines = 6,
+		.netlink_fn = netlink_print_mcast_flags,
 	},
 };
 
diff --git a/netlink.c b/netlink.c
index 35f74c9..996067d 100644
--- a/netlink.c
+++ b/netlink.c
@@ -123,10 +123,14 @@  struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
 					    .minlen = ETH_ALEN,
 					    .maxlen = ETH_ALEN },
 	[BATADV_ATTR_DC_VID]		= { .type = NLA_U16 },
+	[BATADV_ATTR_MCAST_FLAGS]	= { .type = NLA_U8 },
+	[BATADV_ATTR_MCAST_FLAGS_PRIV]	= { .type = NLA_U8 },
 };
 
 static int last_err;
 static char algo_name_buf[256] = "";
+static int mcast_flags = -EINVAL;
+static int mcast_flags_priv = -EINVAL;
 
 static int missing_mandatory_attrs(struct nlattr *attrs[],
 				   const int mandatory[], int num)
@@ -240,6 +244,16 @@  static int info_callback(struct nl_msg *msg, void *arg)
 		if (attrs[BATADV_ATTR_BLA_CRC])
 			bla_group_id = nla_get_u16(attrs[BATADV_ATTR_BLA_CRC]);
 
+		if (attrs[BATADV_ATTR_MCAST_FLAGS])
+			mcast_flags = nla_get_u8(attrs[BATADV_ATTR_MCAST_FLAGS]);
+		else
+			mcast_flags = -EINVAL;
+
+		if (attrs[BATADV_ATTR_MCAST_FLAGS_PRIV])
+			mcast_flags_priv = nla_get_u8(attrs[BATADV_ATTR_MCAST_FLAGS_PRIV]);
+		else
+			mcast_flags = -EINVAL;
+
 		switch (opts->nl_cmd) {
 		case BATADV_CMD_GET_TRANSTABLE_LOCAL:
 			ret = asprintf(&extra_info, ", TTVN: %u", ttvn);
@@ -1185,6 +1199,72 @@  static int dat_cache_callback(struct nl_msg *msg, void *arg)
 	return NL_OK;
 }
 
+static const int mcast_flags_mandatory[] = {
+	BATADV_ATTR_ORIG_ADDRESS,
+};
+
+static int mcast_flags_callback(struct nl_msg *msg, void *arg)
+{
+	struct nlattr *attrs[BATADV_ATTR_MAX+1];
+	struct nlmsghdr *nlh = nlmsg_hdr(msg);
+	struct print_opts *opts = arg;
+	struct bat_host *bat_host;
+	struct genlmsghdr *ghdr;
+	uint8_t *addr;
+	uint8_t flags;
+
+	if (!genlmsg_valid_hdr(nlh, 0)) {
+		fputs("Received invalid data from kernel.\n", stderr);
+		exit(1);
+	}
+
+	ghdr = nlmsg_data(nlh);
+
+	if (ghdr->cmd != BATADV_CMD_GET_MCAST_FLAGS)
+		return NL_OK;
+
+	if (nla_parse(attrs, BATADV_ATTR_MAX, genlmsg_attrdata(ghdr, 0),
+		      genlmsg_len(ghdr), batadv_netlink_policy)) {
+		fputs("Received invalid data from kernel.\n", stderr);
+		exit(1);
+	}
+
+	if (missing_mandatory_attrs(attrs, mcast_flags_mandatory,
+				    ARRAY_SIZE(mcast_flags_mandatory))) {
+		fputs("Missing attributes from kernel\n", stderr);
+		exit(1);
+	}
+
+	addr = nla_data(attrs[BATADV_ATTR_ORIG_ADDRESS]);
+
+	if (opts->read_opt & MULTICAST_ONLY && !(addr[0] & 0x01))
+		return NL_OK;
+
+	if (opts->read_opt & UNICAST_ONLY && (addr[0] & 0x01))
+		return NL_OK;
+
+	bat_host = bat_hosts_find_by_mac((char *)addr);
+	if (!(opts->read_opt & USE_BAT_HOSTS) || !bat_host)
+		printf("%02x:%02x:%02x:%02x:%02x:%02x ",
+		       addr[0], addr[1], addr[2],
+		       addr[3], addr[4], addr[5]);
+	else
+		printf("%17s ", bat_host->name);
+
+	if (attrs[BATADV_ATTR_MCAST_FLAGS]) {
+		flags = nla_get_u8(attrs[BATADV_ATTR_MCAST_FLAGS]);
+
+		printf("[%c%c%c]\n",
+		       flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES ? 'U' : '.',
+		       flags & BATADV_MCAST_WANT_ALL_IPV4 ? '4' : '.',
+		       flags & BATADV_MCAST_WANT_ALL_IPV6 ? '6' : '.');
+	} else {
+		printf("-\n");
+	}
+
+	return NL_OK;
+}
+
 static int netlink_print_common(char *mesh_iface, char *orig_iface,
 				int read_opt, float orig_timeout,
 				float watch_interval, const char *header,
@@ -1439,6 +1519,69 @@  int netlink_print_dat_cache(char *mesh_iface, char *orig_iface, int read_opts,
 	return ret;
 }
 
+int netlink_print_mcast_flags(char *mesh_iface, char *orig_iface, int read_opts,
+			      float orig_timeout, float watch_interval)
+{
+	char querier4, querier6, shadowing4, shadowing6;
+	char *info_header;
+	char *header;
+	bool bridged;
+	int ifindex;
+	int ret;
+
+	ifindex = if_nametoindex(mesh_iface);
+	if (!ifindex) {
+		fprintf(stderr, "Interface %s is unknown\n", mesh_iface);
+		return -ENODEV;
+	}
+
+	/* only parse own multicast flags */
+	info_header = netlink_get_info(ifindex, BATADV_CMD_GET_MCAST_FLAGS, NULL);
+	free(info_header);
+
+	if (mcast_flags < 0 || mcast_flags_priv < 0)
+		return -EINVAL;
+
+	bridged = mcast_flags_priv & BATADV_MCAST_FLAGS_BRIDGED;
+
+	if (bridged) {
+                querier4 = (mcast_flags_priv & BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS) ? '.' : '4';
+                querier6 = (mcast_flags_priv & BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS) ? '.' : '6';
+                shadowing4 = (mcast_flags_priv & BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING) ? '4' : '.';
+                shadowing6 = (mcast_flags_priv & BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING) ? '6' : '.';
+        } else {
+                querier4 = '?';
+                querier6 = '?';
+                shadowing4 = '?';
+                shadowing6 = '?';
+        }
+
+	ret = asprintf(&header,
+		"Multicast flags (own flags: [%c%c%c])\n"
+		 "* Bridged [U]\t\t\t\t%c\n"
+		 "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n"
+		 "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n"
+		 "-------------------------------------------\n"
+		 "       %-10s %s\n",
+		 (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
+		 (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
+		 (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
+		 bridged ? 'U' : '.',
+		 querier4, querier6, shadowing4, shadowing6,
+		 "Originator", "Flags");
+
+	if (ret < 0)
+		return ret;
+
+	ret = netlink_print_common(mesh_iface, orig_iface, read_opts,
+				   orig_timeout, watch_interval, header,
+				   BATADV_CMD_GET_MCAST_FLAGS,
+				   mcast_flags_callback);
+
+	free(header);
+	return ret;
+}
+
 static int nlquery_error_cb(struct sockaddr_nl *nla __maybe_unused,
 			    struct nlmsgerr *nlerr, void *arg)
 {
diff --git a/netlink.h b/netlink.h
index 57870c2..089e25e 100644
--- a/netlink.h
+++ b/netlink.h
@@ -47,6 +47,8 @@  int netlink_print_bla_backbone(char *mesh_iface, char *orig_iface, int read_opt,
 			       float orig_timeout, float watch_interval);
 int netlink_print_dat_cache(char *mesh_iface, char *orig_iface, int read_opt,
 			    float orig_timeout, float watch_interval);
+int netlink_print_mcast_flags(char *mesh_iface, char *orig_iface, int read_opt,
+			      float orig_timeout, float watch_interval);
 
 int translate_mac_netlink(const char *mesh_iface, const struct ether_addr *mac,
 			  struct ether_addr *mac_out);