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authorFelix Fietkau <nbd@openwrt.org>2011-01-31 19:57:28 +0000
committerFelix Fietkau <nbd@openwrt.org>2011-01-31 19:57:28 +0000
commit6c6588ff7384ea9be1d4e97c641b8035a354b5e4 (patch)
tree55d0efb4eeb8b4daf3df1061b8b912428497ce3d
parentec635ea26815d4afe7d3cb5ca4aa30282367f08a (diff)
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libnl-tiny: add unl a convenience wrapper around the libnl api
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25263 3c298f89-4303-0410-b956-a3cf2f4a3e73
-rw-r--r--package/libnl-tiny/src/Makefile2
-rw-r--r--package/libnl-tiny/src/include/unl.h46
-rw-r--r--package/libnl-tiny/src/unl.c290
3 files changed, 337 insertions, 1 deletions
diff --git a/package/libnl-tiny/src/Makefile b/package/libnl-tiny/src/Makefile
index f684155ecc..f6f90ec7fe 100644
--- a/package/libnl-tiny/src/Makefile
+++ b/package/libnl-tiny/src/Makefile
@@ -11,7 +11,7 @@ all: $(LIBNAME)
$(CC) $(WFLAGS) -c -o $@ $(INCLUDES) $(CFLAGS) $<
LIBNL_OBJ=nl.o handlers.o msg.o attr.o cache.o cache_mngt.o object.o socket.o error.o
-GENL_OBJ=genl.o genl_family.o genl_ctrl.o genl_mngt.o
+GENL_OBJ=genl.o genl_family.o genl_ctrl.o genl_mngt.o unl.o
$(LIBNAME): $(LIBNL_OBJ) $(GENL_OBJ)
$(CC) -shared -o $@ $^
diff --git a/package/libnl-tiny/src/include/unl.h b/package/libnl-tiny/src/include/unl.h
new file mode 100644
index 0000000000..57e348ae1d
--- /dev/null
+++ b/package/libnl-tiny/src/include/unl.h
@@ -0,0 +1,46 @@
+#ifndef __UNL_H
+#define __UNL_H
+
+#include <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/family.h>
+#include <stdbool.h>
+
+struct unl {
+ struct nl_sock *sock;
+ struct nl_cache *cache;
+ struct genl_family *family;
+ char *family_name;
+ int hdrlen;
+ bool loop_done;
+};
+
+int unl_genl_init(struct unl *unl, const char *family);
+void unl_free(struct unl *unl);
+
+typedef int (*unl_cb)(struct nl_msg *, void *);
+
+struct nl_msg *unl_genl_msg(struct unl *unl, int cmd, bool dump);
+int unl_genl_request(struct unl *unl, struct nl_msg *msg, unl_cb handler, void *arg);
+int unl_genl_request_single(struct unl *unl, struct nl_msg *msg, struct nl_msg **dest);
+void unl_genl_loop(struct unl *unl, unl_cb handler, void *arg);
+
+int unl_genl_subscribe(struct unl *unl, const char *name);
+int unl_genl_unsubscribe(struct unl *unl, const char *name);
+
+int unl_nl80211_phy_lookup(const char *name);
+int unl_nl80211_wdev_to_phy(struct unl *unl, int wdev);
+struct nl_msg *unl_nl80211_phy_msg(struct unl *unl, int phy, int cmd, bool dump);
+struct nl_msg *unl_nl80211_vif_msg(struct unl *unl, int dev, int cmd, bool dump);
+
+static inline void unl_loop_done(struct unl *unl)
+{
+ unl->loop_done = true;
+}
+
+static inline struct nlattr *unl_find_attr(struct unl *unl, struct nl_msg *msg, int attr)
+{
+ return nlmsg_find_attr(nlmsg_hdr(msg), unl->hdrlen, attr);
+}
+
+#endif
diff --git a/package/libnl-tiny/src/unl.c b/package/libnl-tiny/src/unl.c
new file mode 100644
index 0000000000..a60ba08292
--- /dev/null
+++ b/package/libnl-tiny/src/unl.c
@@ -0,0 +1,290 @@
+#include <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/ctrl.h>
+#include <netlink/genl/family.h>
+#include <sys/types.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <linux/nl80211.h>
+
+#include "unl.h"
+
+static int unl_init(struct unl *unl)
+{
+ unl->sock = nl_socket_alloc();
+ if (!unl->sock)
+ return -1;
+
+ return 0;
+}
+
+int unl_genl_init(struct unl *unl, const char *family)
+{
+ memset(unl, 0, sizeof(*unl));
+
+ if (unl_init(unl))
+ goto error_out;
+
+ unl->hdrlen = NLMSG_ALIGN(sizeof(struct genlmsghdr));
+ unl->family_name = strdup(family);
+ if (!unl->family_name)
+ goto error;
+
+ if (genl_connect(unl->sock))
+ goto error;
+
+ if (genl_ctrl_alloc_cache(unl->sock, &unl->cache))
+ goto error;
+
+ unl->family = genl_ctrl_search_by_name(unl->cache, family);
+ if (!unl->family)
+ goto error;
+
+ return 0;
+
+error:
+ unl_free(unl);
+error_out:
+ return -1;
+}
+
+void unl_free(struct unl *unl)
+{
+ if (unl->family_name)
+ free(unl->family_name);
+
+ if (unl->sock)
+ nl_socket_free(unl->sock);
+
+ if (unl->cache)
+ nl_cache_free(unl->cache);
+
+ memset(unl, 0, sizeof(*unl));
+}
+
+static int
+ack_handler(struct nl_msg *msg, void *arg)
+{
+ int *err = arg;
+ *err = 0;
+ return NL_STOP;
+}
+
+static int
+finish_handler(struct nl_msg *msg, void *arg)
+{
+ int *err = arg;
+ *err = 0;
+ return NL_SKIP;
+}
+
+static int
+error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
+{
+ int *ret = arg;
+ *ret = err->error;
+ return NL_SKIP;
+}
+
+struct nl_msg *unl_genl_msg(struct unl *unl, int cmd, bool dump)
+{
+ struct nl_msg *msg;
+ int flags = 0;
+
+ msg = nlmsg_alloc();
+ if (!msg)
+ goto out;
+
+ if (dump)
+ flags |= NLM_F_DUMP;
+
+ genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ,
+ genl_family_get_id(unl->family), 0, flags, cmd, 0);
+
+out:
+ return msg;
+}
+
+int unl_genl_request(struct unl *unl, struct nl_msg *msg, unl_cb handler, void *arg)
+{
+ struct nlmsghdr *nlh;
+ struct nl_cb *cb;
+ int err;
+
+ cb = nl_cb_alloc(NL_CB_CUSTOM);
+ nlh = nlmsg_hdr(msg);
+
+ err = nl_send_auto_complete(unl->sock, msg);
+ if (err < 0)
+ goto out;
+
+ err = 1;
+ nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
+ nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
+ nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
+ if (handler)
+ nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, handler, arg);
+
+ while (err > 0)
+ nl_recvmsgs(unl->sock, cb);
+
+out:
+ nlmsg_free(msg);
+ nl_cb_put(cb);
+ return err;
+}
+
+static int request_single_cb(struct nl_msg *msg, void *arg)
+{
+ struct nl_msg **dest = arg;
+
+ if (!*dest) {
+ nlmsg_get(msg);
+ *dest = msg;
+ }
+ return NL_SKIP;
+}
+
+int unl_genl_request_single(struct unl *unl, struct nl_msg *msg, struct nl_msg **dest)
+{
+ *dest = NULL;
+ return unl_genl_request(unl, msg, request_single_cb, dest);
+}
+
+static int no_seq_check(struct nl_msg *msg, void *arg)
+{
+ return NL_OK;
+}
+
+void unl_genl_loop(struct unl *unl, unl_cb handler, void *arg)
+{
+ struct nl_cb *cb;
+
+ cb = nl_cb_alloc(NL_CB_CUSTOM);
+ unl->loop_done = false;
+ nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL);
+ nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, handler, arg);
+
+ while (!unl->loop_done)
+ nl_recvmsgs(unl->sock, cb);
+
+ nl_cb_put(cb);
+}
+
+static int unl_genl_multicast_id(struct unl *unl, const char *name)
+{
+ struct nlattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1];
+ struct nlattr *groups, *group;
+ struct nl_msg *msg;
+ int ctrlid;
+ int ret = -1;
+ int rem;
+
+ msg = nlmsg_alloc();
+ if (!msg)
+ return -1;
+
+ ctrlid = genl_ctrl_resolve(unl->sock, "nlctrl");
+ genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0);
+ NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, unl->family_name);
+ unl_genl_request_single(unl, msg, &msg);
+ if (!msg)
+ goto nla_put_failure;
+
+ groups = unl_find_attr(unl, msg, CTRL_ATTR_MCAST_GROUPS);
+ if (!groups)
+ goto fail;
+
+ nla_for_each_nested(group, groups, rem) {
+ const char *gn;
+
+ nla_parse(tb, CTRL_ATTR_MCAST_GRP_MAX, nla_data(group),
+ nla_len(group), NULL);
+
+ if (!tb[CTRL_ATTR_MCAST_GRP_NAME] ||
+ !tb[CTRL_ATTR_MCAST_GRP_ID])
+ continue;
+
+ gn = nla_data(tb[CTRL_ATTR_MCAST_GRP_NAME]);
+ if (strcmp(gn, name) != 0)
+ continue;
+
+ ret = nla_get_u32(tb[CTRL_ATTR_MCAST_GRP_ID]);
+ break;
+ }
+
+fail:
+ nlmsg_free(msg);
+nla_put_failure:
+ return ret;
+}
+
+int unl_genl_subscribe(struct unl *unl, const char *name)
+{
+ int mcid;
+
+ mcid = unl_genl_multicast_id(unl, name);
+ if (mcid < 0)
+ return mcid;
+
+ return nl_socket_add_membership(unl->sock, mcid);
+}
+
+int unl_genl_unsubscribe(struct unl *unl, const char *name)
+{
+ int mcid;
+
+ mcid = unl_genl_multicast_id(unl, name);
+ if (mcid < 0)
+ return mcid;
+
+ return nl_socket_drop_membership(unl->sock, mcid);
+}
+
+int unl_nl80211_phy_lookup(const char *name)
+{
+ char buf[32];
+ int fd, pos;
+
+ snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", name);
+
+ fd = open(buf, O_RDONLY);
+ if (fd < 0)
+ return -1;
+ pos = read(fd, buf, sizeof(buf) - 1);
+ if (pos < 0) {
+ close(fd);
+ return -1;
+ }
+ buf[pos] = '\0';
+ close(fd);
+ return atoi(buf);
+}
+
+int unl_nl80211_wdev_to_phy(struct unl *unl, int wdev)
+{
+ struct nl_msg *msg;
+ struct nlattr *attr;
+ int ret = -1;
+
+ msg = unl_genl_msg(unl, NL80211_CMD_GET_INTERFACE, false);
+ if (!msg)
+ return -1;
+
+ NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, wdev);
+ if (unl_genl_request_single(unl, msg, &msg) < 0)
+ return -1;
+
+ attr = unl_find_attr(unl, msg, NL80211_ATTR_WIPHY);
+ if (!attr)
+ goto out;
+
+ ret = nla_get_u32(attr);
+out:
+nla_put_failure:
+ nlmsg_free(msg);
+ return ret;
+}
+
+