--- /dev/null
+/*
+ * lib/route/class.c Queueing Classes
+ *
+ * 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) 2003-2006 Thomas Graf <tgraf@suug.ch>
+ */
+
+/**
+ * @ingroup tc
+ * @defgroup class Classes
+ * @{
+ */
+
+#include <netlink-local.h>
+#include <netlink-tc.h>
+#include <netlink/netlink.h>
+#include <netlink/route/tc.h>
+#include <netlink/route/class.h>
+#include <netlink/route/class-modules.h>
+#include <netlink/route/qdisc.h>
+#include <netlink/route/classifier.h>
+#include <netlink/utils.h>
+
+/** @cond SKIP */
+static struct nl_cache_ops rtnl_class_ops;
+/** @endcond */
+
+static struct rtnl_class_ops *class_ops_list;
+
+static struct rtnl_class_ops *class_lookup_ops(const char *kind)
+{
+ struct rtnl_class_ops *ops;
+
+ for (ops = class_ops_list; ops; ops = ops->co_next)
+ if (!strcmp(kind, ops->co_kind))
+ return ops;
+
+ return NULL;
+}
+
+static inline struct rtnl_class_ops *class_ops(struct rtnl_class *class)
+{
+ if (!class->c_ops)
+ class->c_ops = class_lookup_ops(class->c_kind);
+
+ return class->c_ops;
+}
+
+/**
+ * @name Class Module API
+ * @{
+ */
+
+/**
+ * Register a class module
+ * @arg ops class module operations
+ */
+int rtnl_class_register(struct rtnl_class_ops *ops)
+{
+ struct rtnl_class_ops *o, **op;
+
+ if (!ops->co_kind[0])
+ BUG();
+
+ for (op = &class_ops_list; (o = *op) != NULL; op = &o->co_next)
+ if (!strcasecmp(ops->co_kind, o->co_kind))
+ return nl_errno(EEXIST);
+
+ ops->co_next = NULL;
+ *op = ops;
+
+ return 0;
+}
+
+/**
+ * Unregister a class module
+ * @arg ops class module operations
+ */
+int rtnl_class_unregister(struct rtnl_class_ops *ops)
+{
+ struct rtnl_class_ops *o, **op;
+
+ for (op = &class_ops_list; (o = *op) != NULL; op = &o->co_next)
+ if (!strcasecmp(ops->co_kind, o->co_kind))
+ break;
+
+ if (!o)
+ return nl_errno(ENOENT);
+
+ *op = ops->co_next;
+
+ return 0;
+}
+
+/** @} */
+
+static int class_msg_parser(struct sockaddr_nl *who, struct nlmsghdr *n,
+ void *arg)
+{
+ int err;
+ struct nl_parser_param *pp = arg;
+ struct rtnl_class *class;
+ struct rtnl_class_ops *ops;
+
+ class = rtnl_class_alloc();
+ if (!class) {
+ err = nl_errno(ENOMEM);
+ goto errout;
+ }
+ class->ce_msgtype = n->nlmsg_type;
+
+ err = tca_msg_parser(n, (struct rtnl_tca *) class);
+ if (err < 0)
+ goto errout_free;
+
+ ops = class_ops(class);
+ if (ops && ops->co_msg_parser) {
+ err = ops->co_msg_parser(class);
+ if (err < 0)
+ goto errout_free;
+ }
+
+ err = pp->pp_cb((struct nl_object *) class, pp);
+ if (err < 0)
+ goto errout_free;
+
+ return P_ACCEPT;
+
+errout_free:
+ rtnl_class_put(class);
+errout:
+ return err;
+}
+
+static int class_request_update(struct nl_cache *cache,
+ struct nl_handle *handle)
+{
+ struct tcmsg tchdr = {
+ .tcm_family = AF_UNSPEC,
+ .tcm_ifindex = cache->c_iarg1,
+ };
+
+ return nl_send_simple(handle, RTM_GETTCLASS, NLM_F_DUMP, &tchdr,
+ sizeof(tchdr));
+}
+
+static void class_free_data(struct nl_object *obj)
+{
+ struct rtnl_class *class = (struct rtnl_class *) obj;
+ struct rtnl_class_ops *ops;
+
+ tca_free_data((struct rtnl_tca *) class);
+
+ ops = class_ops(class);
+ if (ops && ops->co_free_data)
+ ops->co_free_data(class);
+}
+
+static int class_dump_brief(struct nl_object *obj, struct nl_dump_params *p)
+{
+ struct rtnl_class *class = (struct rtnl_class *) obj;
+ struct rtnl_class_ops *ops;
+
+ int line = tca_dump_brief((struct rtnl_tca *) class, "class", p, 0);
+
+ ops = class_ops(class);
+ if (ops && ops->co_dump[NL_DUMP_BRIEF])
+ line = ops->co_dump[NL_DUMP_BRIEF](class, p, line);
+ dp_dump(p, "\n");
+
+ return line;
+}
+
+static int class_dump_full(struct nl_object *obj, struct nl_dump_params *p)
+{
+ struct rtnl_class *class = (struct rtnl_class *) obj;
+ struct rtnl_class_ops *ops;
+ int line;
+
+ line = class_dump_brief(obj, p);
+ line = tca_dump_full((struct rtnl_tca *) class, p, line);
+
+ if (class->c_info) {
+ char buf[32];
+ dp_dump(p, "child-qdisc %s ",
+ rtnl_tc_handle2str(class->c_info, buf, sizeof(buf)));
+ }
+
+ ops = class_ops(class);
+ if (ops && ops->co_dump[NL_DUMP_FULL])
+ line = ops->co_dump[NL_DUMP_FULL](class, p, line);
+ else if (!class->c_info)
+ dp_dump(p, "noop (no leaf qdisc)");
+
+ dp_dump(p, "\n");
+
+ return line;
+}
+
+static int class_dump_stats(struct nl_object *obj, struct nl_dump_params *p)
+{
+ struct rtnl_class *class = (struct rtnl_class *) obj;
+ struct rtnl_class_ops *ops;
+ int line;
+
+ line = class_dump_full(obj, p);
+ line = tca_dump_stats((struct rtnl_tca *) class, p, line);
+ dp_dump(p, "\n");
+
+ ops = class_ops(class);
+ if (ops && ops->co_dump[NL_DUMP_STATS])
+ line = ops->co_dump[NL_DUMP_STATS](class, p, line);
+
+ return line;
+}
+
+static int class_filter(struct nl_object *obj, struct nl_object *filter)
+{
+ return tca_filter((struct rtnl_tca *) obj, (struct rtnl_tca *) filter);
+}
+
+/**
+ * @name Class Addition/Modification
+ * @{
+ */
+
+static struct nl_msg *class_build(struct rtnl_class *class, int type, int flags)
+{
+ struct rtnl_class_ops *ops;
+ struct nl_msg *msg;
+ int err;
+
+ msg = tca_build_msg((struct rtnl_tca *) class, type, flags);
+ if (!msg)
+ goto errout;
+
+ ops = class_ops(class);
+ if (ops && ops->co_get_opts) {
+ struct nl_msg *opts;
+
+ opts = ops->co_get_opts(class);
+ if (opts) {
+ err = nla_put_nested(msg, TCA_OPTIONS, opts);
+ nlmsg_free(opts);
+ if (err < 0)
+ goto errout;
+ }
+ }
+
+ return msg;
+errout:
+ nlmsg_free(msg);
+ return NULL;
+}
+
+/**
+ * Build a netlink message to add a new class
+ * @arg class class to add
+ * @arg flags additional netlink message flags
+ *
+ * Builds a new netlink message requesting an addition of a class.
+ * The netlink message header isn't fully equipped with all relevant
+ * fields and must be sent out via nl_send_auto_complete() or
+ * supplemented as needed.
+ *
+ * Common message flags
+ * - NLM_F_REPLACE - replace possibly existing classes
+ *
+ * @return New netlink message
+ */
+struct nl_msg *rtnl_class_build_add_request(struct rtnl_class *class, int flags)
+{
+ return class_build(class, RTM_NEWTCLASS, NLM_F_CREATE | flags);
+}
+
+/**
+ * Add a new class
+ * @arg handle netlink handle
+ * @arg class class to delete
+ * @arg flags additional netlink message flags
+ *
+ * Builds a netlink message by calling rtnl_qdisc_build_add_request(),
+ * sends the request to the kernel and waits for the next ACK to be
+ * received and thus blocks until the request has been processed.
+ *
+ * Common message flags
+ * - NLM_F_REPLACE - replace possibly existing classes
+ *
+ * @return 0 on success or a negative error code
+ */
+int rtnl_class_add(struct nl_handle *handle, struct rtnl_class *class,
+ int flags)
+{
+ struct nl_msg *msg;
+ int err;
+
+ msg = rtnl_class_build_add_request(class, flags);
+ if (!msg)
+ return nl_errno(ENOMEM);
+
+ err = nl_send_auto_complete(handle, msg);
+ if (err < 0)
+ return err;
+
+ nlmsg_free(msg);
+ return nl_wait_for_ack(handle);
+}
+
+/** @} */
+
+/**
+ * @name General
+ * @{
+ */
+
+/**
+ * Allocate a new class object
+ * @return New class object
+ */
+struct rtnl_class *rtnl_class_alloc(void)
+{
+ return (struct rtnl_class *) nl_object_alloc_from_ops(&rtnl_class_ops);
+}
+
+/**
+ * Give back reference on rclass object.
+ * @arg class Class object to be given back.
+ *
+ * Decrements the reference counter and frees the object if the
+ * last reference has been released.
+ */
+void rtnl_class_put(struct rtnl_class *class)
+{
+ nl_object_put((struct nl_object *) class);
+}
+
+/**
+ * Free class object.
+ * @arg class Class object to be freed.
+ *
+ * @note Always use rtnl_class_put() unless you're absolutely sure
+ * that no other user may have a reference on this object.
+ */
+void rtnl_class_free(struct rtnl_class *class)
+{
+ nl_object_free((struct nl_object *) class);
+}
+
+/**
+ * Build a class cache including all classes attached to the specified interface
+ * @arg handle netlink handle
+ * @arg ifindex interface index of the link the classes are
+ * attached to.
+ *
+ * Allocates a new cache, initializes it properly and updates it to
+ * include all classes attached to the specified interface.
+ *
+ * @note The caller is responsible for destroying and freeing the
+ * cache after using it.
+ * @return The cache or NULL if an error has occured.
+ */
+struct nl_cache * rtnl_class_alloc_cache(struct nl_handle *handle, int ifindex)
+{
+ struct nl_cache * cache;
+
+ cache = nl_cache_alloc_from_ops(&rtnl_class_ops);
+ if (!cache)
+ return NULL;
+
+ cache->c_iarg1 = ifindex;
+
+ if (nl_cache_update(handle, cache) < 0) {
+ nl_cache_free(cache);
+ return NULL;
+ }
+
+ return cache;
+}
+
+/** @} */
+
+/**
+ * @name Leaf Qdisc Access
+ * @{
+ */
+
+/**
+ * Determine if the class has a leaf qdisc attached
+ * @arg class class to check
+ */
+int rtnl_class_has_leaf_qdisc(struct rtnl_class *class)
+{
+ return !!class->c_info;
+}
+
+/**
+ * Lookup the leaf qdisc of a class
+ * @arg class the parent class
+ * @arg cache a qdisc cache including at laest all qdiscs of the
+ * interface the specified class is attached to
+ * @return The qdisc from the cache or NULL if the class has no leaf qdisc
+ */
+struct rtnl_qdisc *rtnl_class_leaf_qdisc(struct rtnl_class *class,
+ struct nl_cache *cache)
+{
+ struct rtnl_qdisc *leaf;
+
+ if (!rtnl_class_has_leaf_qdisc(class))
+ return NULL;
+
+ leaf = rtnl_qdisc_get_by_parent(cache, class->c_ifindex,
+ class->c_handle);
+ if (!leaf || leaf->q_handle != class->c_info)
+ return NULL;
+
+ return leaf;
+}
+
+/** @} */
+
+/**
+ * @name Iterators
+ * @{
+ */
+
+/**
+ * Call a callback for each child class of a class
+ * @arg class the parent class
+ * @arg cache a class cache including all classes of the interface
+ * the specified class is attached to
+ * @arg cb callback function
+ * @arg arg argument to be passed to callback function
+ */
+void rtnl_class_foreach_child(struct rtnl_class *class, struct nl_cache *cache,
+ void (*cb)(struct nl_object *, void *), void *arg)
+{
+ struct rtnl_class *filter;
+
+ filter = rtnl_class_alloc();
+ if (!filter)
+ return;
+
+ rtnl_class_set_parent(filter, class->c_handle);
+ rtnl_class_set_ifindex(filter, class->c_ifindex);
+ rtnl_class_set_kind(filter, class->c_kind);
+
+ nl_cache_foreach_filter(cache, (struct nl_object *) filter, cb, arg);
+ rtnl_class_put(filter);
+}
+
+/**
+ * Call a callback for each classifier attached to the class
+ * @arg class the parent class
+ * @arg cache a filter cache including at least all the filters
+ * attached to the specified class
+ * @arg cb callback function
+ * @arg arg argument to be passed to callback function
+ */
+void rtnl_class_foreach_cls(struct rtnl_class *class, struct nl_cache *cache,
+ void (*cb)(struct nl_object *, void *), void *arg)
+{
+ struct rtnl_cls *filter;
+
+ filter = rtnl_cls_alloc();
+ if (!filter)
+ return;
+
+ rtnl_cls_set_ifindex(filter, class->c_ifindex);
+ rtnl_cls_set_parent(filter, class->c_parent);
+
+ nl_cache_foreach_filter(cache, (struct nl_object *) filter, cb, arg);
+ rtnl_cls_put(filter);
+}
+
+/** @} */
+
+/**
+ * @name Attribute Modifications
+ * @{
+ */
+
+/**
+ * Set the interface index of a class to the specified value
+ * @arg class class to be changed
+ * @arg ifindex new interface index
+ */
+void rtnl_class_set_ifindex(struct rtnl_class *class, int ifindex)
+{
+ tca_set_ifindex((struct rtnl_tca *) class, ifindex);
+}
+
+/**
+ * Get the interface index of a class
+ * @arg class class handle
+ * @return Interface index or RTNL_LINK_NOT_FOUND if not set
+ */
+int rtnl_class_get_ifindex(struct rtnl_class *class)
+{
+ return tca_get_ifindex((struct rtnl_tca *) class);
+}
+
+
+/**
+ * Set the handle of a class to the specified value
+ * @arg class class to be changed
+ * @arg handle new handle
+ */
+void rtnl_class_set_handle(struct rtnl_class *class, uint32_t handle)
+{
+ tca_set_handle((struct rtnl_tca *) class, handle);
+}
+
+/**
+ * Get the handle of a class
+ * @arg class class handle
+ * @return Handle or 0 if not set
+ */
+uint32_t rtnl_class_get_handle(struct rtnl_class *class)
+{
+ return tca_get_handle((struct rtnl_tca *) class);
+}
+
+/**
+ * Set the parent handle of a class to the specified value
+ * @arg class class to be changed
+ * @arg parent new parent handle
+ */
+void rtnl_class_set_parent(struct rtnl_class *class, uint32_t parent)
+{
+ tca_set_parent((struct rtnl_tca *) class, parent);
+}
+
+/**
+ * Get the parent handle of a class
+ * @arg class class handle
+ * @return Parent handle or 0 if not set
+ */
+uint32_t rtnl_class_get_parent(struct rtnl_class *class)
+{
+ return tca_get_parent((struct rtnl_tca *) class);
+}
+
+/**
+ * Set the kind of a class to the specified value
+ * @arg class class to be changed
+ * @arg name new kind name
+ */
+void rtnl_class_set_kind(struct rtnl_class *class, const char *name)
+{
+ tca_set_kind((struct rtnl_tca *) class, name);
+}
+
+/**
+ * Get the kind of a class
+ * @arg class class handle
+ * @return Kind or NULL if not set
+ */
+char *rtnl_class_get_kind(struct rtnl_class *class)
+{
+ return tca_get_kind((struct rtnl_tca *) class);
+}
+
+/**
+ * Get the statistic specified by the id
+ * @arg class class handle
+ * @arg id statistic id
+ * @return The current counter of the specified statistic
+ */
+uint64_t rtnl_class_get_stat(struct rtnl_class *class,
+ enum rtnl_tc_stats_id id)
+{
+ return tca_get_stat((struct rtnl_tca *) class, id);
+}
+
+/** @} */
+
+static struct nl_cache_ops rtnl_class_ops = {
+ .co_name = "route/class",
+ .co_size = sizeof(struct rtnl_class),
+ .co_hdrsize = sizeof(struct tcmsg),
+ .co_msgtypes = {
+ { RTM_NEWTCLASS, "new" },
+ { RTM_DELTCLASS, "del" },
+ { RTM_GETTCLASS, "get" },
+ { -1, NULL },
+ },
+ .co_protocol = NETLINK_ROUTE,
+ .co_request_update = &class_request_update,
+ .co_msg_parser = &class_msg_parser,
+ .co_free_data = &class_free_data,
+ .co_dump[NL_DUMP_BRIEF] = &class_dump_brief,
+ .co_dump[NL_DUMP_FULL] = &class_dump_full,
+ .co_dump[NL_DUMP_STATS] = &class_dump_stats,
+ .co_filter = &class_filter,
+};
+
+static void __init class_init(void)
+{
+ nl_cache_mngt_register(&rtnl_class_ops);
+}
+
+static void __exit class_exit(void)
+{
+ nl_cache_mngt_unregister(&rtnl_class_ops);
+}
+
+/** @} */
git://git.onelab.eu / libnl.git / blobdiff