-/*
- * 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