--- /dev/null
+/*
+ * lib/route/classifier.c Classifier
+ *
+ * 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 cls Classifiers
+ *
+ * @par Classifier Identification
+ * - protocol
+ * - priority
+ * - parent
+ * - interface
+ * - kind
+ * - handle
+ *
+ * @{
+ */
+
+#include <netlink-local.h>
+#include <netlink-tc.h>
+#include <netlink/netlink.h>
+#include <netlink/utils.h>
+#include <netlink/route/tc.h>
+#include <netlink/route/classifier.h>
+#include <netlink/route/classifier-modules.h>
+#include <netlink/route/link.h>
+
+/** @cond SKIP */
+#define CLS_ATTR_PRIO (TCA_ATTR_MAX << 1)
+#define CLS_ATTR_PROTOCOL (TCA_ATTR_MAX << 2)
+
+static struct nl_cache_ops rtnl_cls_ops;
+/** @endcond */
+
+static struct rtnl_cls_ops *cls_ops_list;
+
+static struct rtnl_cls_ops * cls_lookup_ops(char *kind)
+{
+ struct rtnl_cls_ops *ops;
+
+ for (ops = cls_ops_list; ops; ops = ops->co_next)
+ if (!strcmp(kind, ops->co_kind))
+ return ops;
+
+ return NULL;
+}
+
+static inline struct rtnl_cls_ops *cls_ops(struct rtnl_cls *cls)
+{
+ if (!cls->c_ops)
+ cls->c_ops = cls_lookup_ops(cls->c_kind);
+
+ return cls->c_ops;
+}
+
+/**
+ * @name Classifier Module API
+ * @{
+ */
+
+/**
+ * Register a classifier module
+ * @arg ops classifier module operations
+ */
+int rtnl_cls_register(struct rtnl_cls_ops *ops)
+{
+ struct rtnl_cls_ops *o, **op;
+
+ if (!ops->co_kind)
+ BUG();
+
+ for (op = &cls_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 classifier module
+ * @arg ops classifier module operations
+ */
+int rtnl_cls_unregister(struct rtnl_cls_ops *ops)
+{
+ struct rtnl_cls_ops *o, **op;
+
+ for (op = &cls_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 cls_msg_parser(struct sockaddr_nl *who, struct nlmsghdr *nlh,
+ void *arg)
+{
+ int err;
+ struct nl_parser_param *pp = arg;
+ struct rtnl_cls *cls;
+ struct rtnl_cls_ops *ops;
+
+ cls = rtnl_cls_alloc();
+ if (!cls) {
+ err = nl_errno(ENOMEM);
+ goto errout;
+ }
+ cls->ce_msgtype = nlh->nlmsg_type;
+
+ err = tca_msg_parser(nlh, (struct rtnl_tca *) cls);
+ if (err < 0)
+ goto errout_free;
+
+ cls->c_prio = TC_H_MAJ(cls->c_info) >> 16;
+ cls->c_protocol = ntohs(TC_H_MIN(cls->c_info));
+
+ ops = cls_ops(cls);
+ if (ops && ops->co_msg_parser) {
+ err = ops->co_msg_parser(cls);
+ if (err < 0)
+ goto errout_free;
+ }
+
+ err = pp->pp_cb((struct nl_object *) cls, pp);
+ if (err < 0)
+ goto errout_free;
+
+ return P_ACCEPT;
+
+errout_free:
+ rtnl_cls_put(cls);
+errout:
+ return err;
+}
+
+static int cls_request_update(struct nl_cache *cache, struct nl_handle *handle)
+{
+ struct tcmsg tchdr = {
+ .tcm_family = AF_UNSPEC,
+ .tcm_ifindex = cache->c_iarg1,
+ .tcm_parent = cache->c_iarg2,
+ };
+
+ return nl_send_simple(handle, RTM_GETTFILTER, NLM_F_DUMP, &tchdr,
+ sizeof(tchdr));
+}
+
+
+static void cls_free_data(struct nl_object *obj)
+{
+ struct rtnl_cls *cls = (struct rtnl_cls *) obj;
+ struct rtnl_cls_ops *ops;
+
+ tca_free_data((struct rtnl_tca *) cls);
+
+ ops = cls_ops(cls);
+ if (ops && ops->co_free_data)
+ ops->co_free_data(cls);
+}
+
+static int cls_dump_brief(struct nl_object *obj, struct nl_dump_params *p)
+{
+ char buf[32];
+ struct rtnl_cls *cls = (struct rtnl_cls *) obj;
+ struct rtnl_cls_ops *ops;
+ int line;
+
+ line = tca_dump_brief((struct rtnl_tca *) cls, "cls", p, 0);
+
+ dp_dump(p, " prio %u protocol %s", cls->c_prio,
+ nl_ether_proto2str(cls->c_protocol, buf, sizeof(buf)));
+
+ ops = cls_ops(cls);
+ if (ops && ops->co_dump[NL_DUMP_BRIEF])
+ line = ops->co_dump[NL_DUMP_BRIEF](cls, p, line);
+ dp_dump(p, "\n");
+
+ return line;
+}
+
+static int cls_dump_full(struct nl_object *obj, struct nl_dump_params *p)
+{
+ struct rtnl_cls *cls = (struct rtnl_cls *) obj;
+ struct rtnl_cls_ops *ops;
+ int line;
+
+ line = cls_dump_brief(obj, p);
+ line = tca_dump_full((struct rtnl_tca *) cls, p, line);
+
+ ops = cls_ops(cls);
+ if (ops && ops->co_dump[NL_DUMP_FULL])
+ line = ops->co_dump[NL_DUMP_FULL](cls, p, line);
+ else
+ dp_dump(p, "no options\n");
+
+ return line;
+}
+
+static int cls_dump_stats(struct nl_object *obj, struct nl_dump_params *p)
+{
+ struct rtnl_cls *cls = (struct rtnl_cls *) obj;
+ struct rtnl_cls_ops *ops;
+ int line;
+
+ line = cls_dump_full(obj, p);
+ line = tca_dump_stats((struct rtnl_tca *) cls, p, line);
+ dp_dump(p, "\n");
+
+ ops = cls_ops(cls);
+ if (ops && ops->co_dump[NL_DUMP_STATS])
+ line = ops->co_dump[NL_DUMP_STATS](cls, p, line);
+
+ return line;
+}
+
+static int cls_filter(struct nl_object *obj, struct nl_object *filter)
+{
+ return tca_filter((struct rtnl_tca *) obj, (struct rtnl_tca *) filter);
+}
+
+static struct nl_msg *cls_build(struct rtnl_cls *cls, int type, int flags)
+{
+ struct nl_msg *msg;
+ struct rtnl_cls_ops *ops;
+ int err, prio, proto;
+ struct tcmsg *tchdr;
+
+ msg = tca_build_msg((struct rtnl_tca *) cls, type, flags);
+ if (!msg)
+ goto errout;
+
+ tchdr = nlmsg_data(nlmsg_hdr(msg));
+ prio = cls->c_mask & CLS_ATTR_PRIO ? cls->c_prio : 0;
+ proto = cls->c_mask & CLS_ATTR_PROTOCOL ? cls->c_protocol : ETH_P_ALL;
+ tchdr->tcm_info = TC_H_MAKE(prio << 16, htons(proto)),
+
+ ops = cls_ops(cls);
+ if (ops && ops->co_get_opts) {
+ struct nl_msg *opts;
+
+ opts = ops->co_get_opts(cls);
+ 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;
+}
+
+/**
+ * @name Classifier Addition/Modification/Deletion
+ * @{
+ */
+
+/**
+ * Build a netlink message to add a new classifier
+ * @arg cls classifier to add
+ * @arg flags additional netlink message flags
+ *
+ * Builds a new netlink message requesting an addition of a classifier
+ * 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. \a classifier must contain the attributes of
+ * the new classifier set via \c rtnl_cls_set_* functions. \a opts
+ * may point to the clsasifier specific options.
+ *
+ * @return New netlink message
+ */
+struct nl_msg * rtnl_cls_build_add_request(struct rtnl_cls *cls, int flags)
+{
+ return cls_build(cls, RTM_NEWTFILTER, NLM_F_CREATE | flags);
+}
+
+/**
+ * Add a new classifier
+ * @arg handle netlink handle
+ * @arg cls classifier to add
+ * @arg flags additional netlink message flags
+ *
+ * Builds a netlink message by calling rtnl_cls_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.
+ *
+ * @return 0 on sucess or a negative error if an error occured.
+ */
+int rtnl_cls_add(struct nl_handle *handle, struct rtnl_cls *cls, int flags)
+{
+ int err;
+ struct nl_msg *msg;
+
+ msg = rtnl_cls_build_add_request(cls, 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);
+}
+
+/**
+ * Build a netlink message to change classifier attributes
+ * @arg cls classifier to change
+ * @arg flags additional netlink message flags
+ *
+ * Builds a new netlink message requesting a change of a neigh
+ * attributes. The netlink message header isn't fully equipped with
+ * all relevant fields and must thus be sent out via nl_send_auto_complete()
+ * or supplemented as needed.
+ *
+ * @return The netlink message
+ */
+struct nl_msg *rtnl_cls_build_change_request(struct rtnl_cls *cls, int flags)
+{
+ return cls_build(cls, RTM_NEWTFILTER, NLM_F_REPLACE | flags);
+}
+
+/**
+ * Change a classifier
+ * @arg handle netlink handle
+ * @arg cls classifier to change
+ * @arg flags additional netlink message flags
+ *
+ * Builds a netlink message by calling rtnl_cls_build_change_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.
+ *
+ * @return 0 on sucess or a negative error if an error occured.
+ */
+int rtnl_cls_change(struct nl_handle *handle, struct rtnl_cls *cls,
+ int flags)
+{
+ int err;
+ struct nl_msg *msg;
+
+ msg = rtnl_cls_build_change_request(cls, 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);
+}
+
+/**
+ * Build a netlink request message to delete a classifier
+ * @arg cls classifier to delete
+ * @arg flags additional netlink message flags
+ *
+ * Builds a new netlink message requesting a deletion of a classifier.
+ * The netlink message header isn't fully equipped with all relevant
+ * fields and must thus be sent out via nl_send_auto_complete()
+ * or supplemented as needed.
+ *
+ * @return New netlink message
+ */
+struct nl_msg *rtnl_cls_build_delete_request(struct rtnl_cls *cls, int flags)
+{
+ return cls_build(cls, RTM_DELTFILTER, flags);
+}
+
+
+/**
+ * Delete a classifier
+ * @arg handle netlink handle
+ * @arg cls classifier to delete
+ * @arg flags additional netlink message flags
+ *
+ * Builds a netlink message by calling rtnl_cls_build_delete_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.
+ *
+ * @return 0 on sucess or a negative error if an error occured.
+ */
+int rtnl_cls_delete(struct nl_handle *handle, struct rtnl_cls *cls, int flags)
+{
+ int err;
+ struct nl_msg *msg;
+
+ msg = rtnl_cls_build_delete_request(cls, 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 API
+ * @{
+ */
+
+/**
+ * Allocate a new classifier object
+ * @return New classifier object
+ */
+struct rtnl_cls *rtnl_cls_alloc(void)
+{
+ return (struct rtnl_cls *) nl_object_alloc_from_ops(&rtnl_cls_ops);
+}
+
+/**
+ * Give back reference on classifier object.
+ * @arg cls Classifier object to be given back.
+ *
+ * Decrements the reference counter and frees the object if the
+ * last reference has been released.
+ */
+void rtnl_cls_put(struct rtnl_cls *cls)
+{
+ nl_object_put((struct nl_object *) cls);
+}
+
+/**
+ * Free classifier object.
+ * @arg cls Classifier object to be freed.
+ *
+ * @note Always use rtnl_cls_put() unless you're absolutely sure
+ * that no other user may have a reference on this object.
+ */
+void rtnl_cls_free(struct rtnl_cls *cls)
+{
+ nl_object_free((struct nl_object *) cls);
+}
+
+/**
+ * Build a classifier cache including all classifiers attached to the
+ * specified class/qdisc on eht specified interface.
+ * @arg handle netlink handle
+ * @arg ifindex interface index of the link the classes are
+ * attached to.
+ * @arg parent parent qdisc/class
+ *
+ * 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_cls_alloc_cache(struct nl_handle *handle,
+ int ifindex, uint32_t parent)
+{
+ struct nl_cache * cache;
+
+ cache = nl_cache_alloc_from_ops(&rtnl_cls_ops);
+ if (cache == NULL)
+ return NULL;
+
+ cache->c_iarg1 = ifindex;
+ cache->c_iarg2 = parent;
+
+ if (nl_cache_update(handle, cache) < 0) {
+ nl_cache_free(cache);
+ return NULL;
+ }
+
+ return cache;
+}
+
+void rtnl_cls_set_ifindex(struct rtnl_cls *f, int ifindex)
+{
+ tca_set_ifindex((struct rtnl_tca *) f, ifindex);
+}
+
+void rtnl_cls_set_handle(struct rtnl_cls *f, uint32_t handle)
+{
+ tca_set_handle((struct rtnl_tca *) f, handle);
+}
+
+void rtnl_cls_set_parent(struct rtnl_cls *f, uint32_t parent)
+{
+ tca_set_parent((struct rtnl_tca *) f, parent);
+}
+
+void rtnl_cls_set_kind(struct rtnl_cls *f, const char *kind)
+{
+ tca_set_kind((struct rtnl_tca *) f, kind);
+}
+
+/**
+ * Set prioroty of a classifier
+ * @arg cls classifier to change
+ * @arg prio new priority
+ */
+void rtnl_cls_set_prio(struct rtnl_cls *cls, int prio)
+{
+ cls->c_prio = prio;
+ cls->c_mask |= CLS_ATTR_PRIO;
+}
+
+/**
+ * Get priority of a classifier
+ * @arg cls classifier
+ */
+int rtnl_cls_get_prio(struct rtnl_cls *cls)
+{
+ if (cls->c_mask & CLS_ATTR_PRIO)
+ return cls->c_prio;
+ else
+ return 0;
+}
+
+/**
+ * Set protocol of a classifier
+ * @arg cls classifier to change
+ * @arg protocol protocol identifier (ETH_P_xxx) in host byte-order
+ */
+void rtnl_cls_set_protocol(struct rtnl_cls *cls, int protocol)
+{
+ cls->c_protocol = protocol;
+ cls->c_mask |= CLS_ATTR_PROTOCOL;
+}
+
+/**
+ * Get protocol of a classifier
+ * @arg cls classifier
+ */
+int rtnl_cls_get_protocol(struct rtnl_cls *cls)
+{
+ if (cls->c_mask & CLS_ATTR_PROTOCOL)
+ return cls->c_protocol;
+ else
+ return 0;
+}
+
+/** @} */
+
+static struct nl_cache_ops rtnl_cls_ops = {
+ .co_name = "route/cls",
+ .co_size = sizeof(struct rtnl_cls),
+ .co_hdrsize = sizeof(struct tcmsg),
+ .co_msgtypes = {
+ { RTM_NEWTFILTER, "new" },
+ { RTM_DELTFILTER, "delete" },
+ { RTM_GETTFILTER, "get" },
+ { -1, NULL },
+ },
+ .co_protocol = NETLINK_ROUTE,
+ .co_request_update = cls_request_update,
+ .co_filter = cls_filter,
+ .co_free_data = cls_free_data,
+ .co_msg_parser = cls_msg_parser,
+ .co_dump[NL_DUMP_BRIEF] = cls_dump_brief,
+ .co_dump[NL_DUMP_FULL] = cls_dump_full,
+ .co_dump[NL_DUMP_STATS] = cls_dump_stats,
+};
+
+static void __init cls_init(void)
+{
+ nl_cache_mngt_register(&rtnl_cls_ops);
+}
+
+static void __exit cls_exit(void)
+{
+ nl_cache_mngt_unregister(&rtnl_cls_ops);
+}
+
+/** @} */
git://git.onelab.eu / libnl.git / blobdiff