--- /dev/null
+/*
+ * lib/genl/ctrl.c Generic Netlink Controller
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
+ */
+
+/**
+ * @ingroup genl_mngt
+ * @defgroup ctrl Controller
+ * @brief
+ *
+ * @{
+ */
+
+#include <netlink-generic.h>
+#include <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/family.h>
+#include <netlink/genl/mngt.h>
+#include <netlink/genl/ctrl.h>
+#include <netlink/utils.h>
+
+/** @cond SKIP */
+#define CTRL_VERSION 0x0001
+
+static struct nl_cache_ops genl_ctrl_ops;
+/** @endcond */
+
+static int ctrl_request_update(struct nl_cache *c, struct nl_sock *h)
+{
+ return genl_send_simple(h, GENL_ID_CTRL, CTRL_CMD_GETFAMILY,
+ CTRL_VERSION, NLM_F_DUMP);
+}
+
+static struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = {
+ [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 },
+ [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_STRING,
+ .maxlen = GENL_NAMSIZ },
+ [CTRL_ATTR_VERSION] = { .type = NLA_U32 },
+ [CTRL_ATTR_HDRSIZE] = { .type = NLA_U32 },
+ [CTRL_ATTR_MAXATTR] = { .type = NLA_U32 },
+ [CTRL_ATTR_OPS] = { .type = NLA_NESTED },
+};
+
+static struct nla_policy family_op_policy[CTRL_ATTR_OP_MAX+1] = {
+ [CTRL_ATTR_OP_ID] = { .type = NLA_U32 },
+ [CTRL_ATTR_OP_FLAGS] = { .type = NLA_U32 },
+};
+
+static int ctrl_msg_parser(struct nl_cache_ops *ops, struct genl_cmd *cmd,
+ struct genl_info *info, void *arg)
+{
+ struct genl_family *family;
+ struct nl_parser_param *pp = arg;
+ int err;
+
+ family = genl_family_alloc();
+ if (family == NULL) {
+ err = -NLE_NOMEM;
+ goto errout;
+ }
+
+ if (info->attrs[CTRL_ATTR_FAMILY_NAME] == NULL) {
+ err = -NLE_MISSING_ATTR;
+ goto errout;
+ }
+
+ if (info->attrs[CTRL_ATTR_FAMILY_ID] == NULL) {
+ err = -NLE_MISSING_ATTR;
+ goto errout;
+ }
+
+ family->ce_msgtype = info->nlh->nlmsg_type;
+ genl_family_set_id(family,
+ nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]));
+ genl_family_set_name(family,
+ nla_get_string(info->attrs[CTRL_ATTR_FAMILY_NAME]));
+
+ if (info->attrs[CTRL_ATTR_VERSION]) {
+ uint32_t version = nla_get_u32(info->attrs[CTRL_ATTR_VERSION]);
+ genl_family_set_version(family, version);
+ }
+
+ if (info->attrs[CTRL_ATTR_HDRSIZE]) {
+ uint32_t hdrsize = nla_get_u32(info->attrs[CTRL_ATTR_HDRSIZE]);
+ genl_family_set_hdrsize(family, hdrsize);
+ }
+
+ if (info->attrs[CTRL_ATTR_MAXATTR]) {
+ uint32_t maxattr = nla_get_u32(info->attrs[CTRL_ATTR_MAXATTR]);
+ genl_family_set_maxattr(family, maxattr);
+ }
+
+ if (info->attrs[CTRL_ATTR_OPS]) {
+ struct nlattr *nla, *nla_ops;
+ int remaining;
+
+ nla_ops = info->attrs[CTRL_ATTR_OPS];
+ nla_for_each_nested(nla, nla_ops, remaining) {
+ struct nlattr *tb[CTRL_ATTR_OP_MAX+1];
+ int flags = 0, id;
+
+ err = nla_parse_nested(tb, CTRL_ATTR_OP_MAX, nla,
+ family_op_policy);
+ if (err < 0)
+ goto errout;
+
+ if (tb[CTRL_ATTR_OP_ID] == NULL) {
+ err = -NLE_MISSING_ATTR;
+ goto errout;
+ }
+
+ id = nla_get_u32(tb[CTRL_ATTR_OP_ID]);
+
+ if (tb[CTRL_ATTR_OP_FLAGS])
+ flags = nla_get_u32(tb[CTRL_ATTR_OP_FLAGS]);
+
+ err = genl_family_add_op(family, id, flags);
+ if (err < 0)
+ goto errout;
+
+ }
+ }
+
+ err = pp->pp_cb((struct nl_object *) family, pp);
+errout:
+ genl_family_put(family);
+ return err;
+}
+
+/**
+ * @name Cache Management
+ * @{
+ */
+
+int genl_ctrl_alloc_cache(struct nl_sock *sock, struct nl_cache **result)
+{
+ return nl_cache_alloc_and_fill(&genl_ctrl_ops, sock, result);
+}
+
+/**
+ * Look up generic netlink family by id in the provided cache.
+ * @arg cache Generic netlink family cache.
+ * @arg id Family identifier.
+ *
+ * Searches through the cache looking for a registered family
+ * matching the specified identifier. The caller will own a
+ * reference on the returned object which needs to be given
+ * back after usage using genl_family_put().
+ *
+ * @return Generic netlink family object or NULL if no match was found.
+ */
+struct genl_family *genl_ctrl_search(struct nl_cache *cache, int id)
+{
+ struct genl_family *fam;
+
+ if (cache->c_ops != &genl_ctrl_ops)
+ BUG();
+
+ nl_list_for_each_entry(fam, &cache->c_items, ce_list) {
+ if (fam->gf_id == id) {
+ nl_object_get((struct nl_object *) fam);
+ return fam;
+ }
+ }
+
+ return NULL;
+}
+
+/**
+ * @name Resolver
+ * @{
+ */
+
+/**
+ * Look up generic netlink family by family name in the provided cache.
+ * @arg cache Generic netlink family cache.
+ * @arg name Family name.
+ *
+ * Searches through the cache looking for a registered family
+ * matching the specified name. The caller will own a reference
+ * on the returned object which needs to be given back after
+ * usage using genl_family_put().
+ *
+ * @return Generic netlink family object or NULL if no match was found.
+ */
+struct genl_family *genl_ctrl_search_by_name(struct nl_cache *cache,
+ const char *name)
+{
+ struct genl_family *fam;
+
+ if (cache->c_ops != &genl_ctrl_ops)
+ BUG();
+
+ nl_list_for_each_entry(fam, &cache->c_items, ce_list) {
+ if (!strcmp(name, fam->gf_name)) {
+ nl_object_get((struct nl_object *) fam);
+ return fam;
+ }
+ }
+
+ return NULL;
+}
+
+/** @} */
+
+/**
+ * Resolve generic netlink family name to its identifier
+ * @arg sk Netlink socket.
+ * @arg name Name of generic netlink family
+ *
+ * Resolves the generic netlink family name to its identifer and returns
+ * it.
+ *
+ * @return A positive identifier or a negative error code.
+ */
+int genl_ctrl_resolve(struct nl_sock *sk, const char *name)
+{
+ struct nl_cache *cache;
+ struct genl_family *family;
+ int err;
+
+ if ((err = genl_ctrl_alloc_cache(sk, &cache)) < 0)
+ return err;
+
+ family = genl_ctrl_search_by_name(cache, name);
+ if (family == NULL) {
+ err = -NLE_OBJ_NOTFOUND;
+ goto errout;
+ }
+
+ err = genl_family_get_id(family);
+ genl_family_put(family);
+errout:
+ nl_cache_free(cache);
+
+ return err;
+}
+
+/** @} */
+
+static struct genl_cmd genl_cmds[] = {
+ {
+ .c_id = CTRL_CMD_NEWFAMILY,
+ .c_name = "NEWFAMILY" ,
+ .c_maxattr = CTRL_ATTR_MAX,
+ .c_attr_policy = ctrl_policy,
+ .c_msg_parser = ctrl_msg_parser,
+ },
+ {
+ .c_id = CTRL_CMD_DELFAMILY,
+ .c_name = "DELFAMILY" ,
+ },
+ {
+ .c_id = CTRL_CMD_GETFAMILY,
+ .c_name = "GETFAMILY" ,
+ },
+ {
+ .c_id = CTRL_CMD_NEWOPS,
+ .c_name = "NEWOPS" ,
+ },
+ {
+ .c_id = CTRL_CMD_DELOPS,
+ .c_name = "DELOPS" ,
+ },
+};
+
+static struct genl_ops genl_ops = {
+ .o_cmds = genl_cmds,
+ .o_ncmds = ARRAY_SIZE(genl_cmds),
+};
+
+/** @cond SKIP */
+extern struct nl_object_ops genl_family_ops;
+/** @endcond */
+
+static struct nl_cache_ops genl_ctrl_ops = {
+ .co_name = "genl/family",
+ .co_hdrsize = GENL_HDRSIZE(0),
+ .co_msgtypes = GENL_FAMILY(GENL_ID_CTRL, "nlctrl"),
+ .co_genl = &genl_ops,
+ .co_protocol = NETLINK_GENERIC,
+ .co_request_update = ctrl_request_update,
+ .co_obj_ops = &genl_family_ops,
+};
+
+static void __init ctrl_init(void)
+{
+ genl_register(&genl_ctrl_ops);
+}
+
+static void __exit ctrl_exit(void)
+{
+ genl_unregister(&genl_ctrl_ops);
+}
+
+/** @} */
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