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467 lines
12 KiB
467 lines
12 KiB
/* SPDX-License-Identifier: LGPL-2.1-only */
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/*
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* lib/route/classifier.c Classifier
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2003-2013 Thomas Graf <tgraf@suug.ch>
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*/
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/**
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* @ingroup tc
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* @defgroup cls Classifiers
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* @{
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*/
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#include <netlink-private/netlink.h>
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#include <netlink-private/tc.h>
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#include <netlink/netlink.h>
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#include <netlink/utils.h>
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#include <netlink-private/route/tc-api.h>
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#include <netlink/route/classifier.h>
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#include <netlink/route/link.h>
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/** @cond SKIP */
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#define CLS_ATTR_PRIO (TCA_ATTR_MAX << 1)
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#define CLS_ATTR_PROTOCOL (TCA_ATTR_MAX << 2)
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/** @endcond */
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static struct nl_object_ops cls_obj_ops;
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static struct nl_cache_ops rtnl_cls_ops;
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static int cls_build(struct rtnl_cls *cls, int type, int flags,
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struct nl_msg **result)
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{
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int err, prio, proto;
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struct tcmsg *tchdr;
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uint32_t required = TCA_ATTR_IFINDEX;
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if ((cls->ce_mask & required) != required) {
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APPBUG("ifindex must be specified");
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return -NLE_MISSING_ATTR;
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}
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err = rtnl_tc_msg_build(TC_CAST(cls), type, flags, result);
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if (err < 0)
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return err;
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tchdr = nlmsg_data(nlmsg_hdr(*result));
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prio = rtnl_cls_get_prio(cls);
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proto = rtnl_cls_get_protocol(cls);
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tchdr->tcm_info = TC_H_MAKE(prio << 16, htons(proto));
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return 0;
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}
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/**
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* @name Allocation/Freeing
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* @{
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*/
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struct rtnl_cls *rtnl_cls_alloc(void)
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{
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struct rtnl_tc *tc;
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tc = TC_CAST(nl_object_alloc(&cls_obj_ops));
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if (tc)
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tc->tc_type = RTNL_TC_TYPE_CLS;
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return (struct rtnl_cls *) tc;
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}
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void rtnl_cls_put(struct rtnl_cls *cls)
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{
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nl_object_put((struct nl_object *) cls);
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}
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/** @} */
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/**
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* @name Attributes
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* @{
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*/
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void rtnl_cls_set_prio(struct rtnl_cls *cls, uint16_t prio)
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{
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cls->c_prio = prio;
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cls->ce_mask |= CLS_ATTR_PRIO;
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}
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uint16_t rtnl_cls_get_prio(struct rtnl_cls *cls)
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{
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if (cls->ce_mask & CLS_ATTR_PRIO)
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return cls->c_prio;
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else
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return 0;
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}
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void rtnl_cls_set_protocol(struct rtnl_cls *cls, uint16_t protocol)
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{
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cls->c_protocol = protocol;
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cls->ce_mask |= CLS_ATTR_PROTOCOL;
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}
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uint16_t rtnl_cls_get_protocol(struct rtnl_cls *cls)
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{
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if (cls->ce_mask & CLS_ATTR_PROTOCOL)
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return cls->c_protocol;
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else
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return ETH_P_ALL;
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}
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/** @} */
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/**
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* @name Addition/Modification/Deletion
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* @{
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*/
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/**
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* Build a netlink message requesting the addition of a classifier
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* @arg cls Classifier to add
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* @arg flags Additional netlink message flags
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* @arg result Pointer to store resulting netlink message
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*
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* The behaviour of this function is identical to rtnl_cls_add() with
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* the exception that it will not send the message but return it int the
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* provided return pointer instead.
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*
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* @see rtnl_cls_add()
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*
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* @return 0 on success or a negative error code.
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*/
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int rtnl_cls_build_add_request(struct rtnl_cls *cls, int flags,
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struct nl_msg **result)
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{
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if (!(flags & NLM_F_CREATE) && !(cls->ce_mask & CLS_ATTR_PRIO)) {
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APPBUG("prio must be specified if not a new classifier");
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return -NLE_MISSING_ATTR;
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}
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return cls_build(cls, RTM_NEWTFILTER, flags, result);
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}
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/**
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* Add/Update classifier
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* @arg sk Netlink socket
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* @arg cls Classifier to add/update
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* @arg flags Additional netlink message flags
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*
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* Builds a \c RTM_NEWTFILTER netlink message requesting the addition
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* of a new classifier and sends the message to the kernel. The
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* configuration of the classifier is derived from the attributes of
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* the specified traffic class.
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*
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* The following flags may be specified:
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* - \c NLM_F_CREATE: Create classifier if it does not exist,
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* otherwise -NLE_OBJ_NOTFOUND is returned.
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* - \c NLM_F_EXCL: Return -NLE_EXISTS if a classifier with
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* matching handle exists already.
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*
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* Existing classifiers with matching handles will be updated, unless
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* the flag \c NLM_F_EXCL is specified. If no matching classifier
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* exists, it will be created if the flag \c NLM_F_CREATE is set,
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* otherwise the error -NLE_OBJ_NOTFOUND is returned.
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*
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* If the parent qdisc does not support classes, the error
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* \c NLE_OPNOTSUPP is returned.
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*
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* After sending, the function will wait for the ACK or an eventual
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* error message to be received and will therefore block until the
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* operation has been completed.
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*
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* @note Disabling auto-ack (nl_socket_disable_auto_ack()) will cause
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* this function to return immediately after sending. In this case,
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* it is the responsibility of the caller to handle any error
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* messages returned.
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*
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* @return 0 on success or a negative error code.
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*/
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int rtnl_cls_add(struct nl_sock *sk, struct rtnl_cls *cls, int flags)
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{
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struct nl_msg *msg;
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int err;
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if ((err = rtnl_cls_build_add_request(cls, flags, &msg)) < 0)
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return err;
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return nl_send_sync(sk, msg);
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}
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/**
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* Build a netlink message to change classifier attributes
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* @arg cls classifier to change
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* @arg flags additional netlink message flags
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* @arg result Pointer to store resulting message.
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*
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* Builds a new netlink message requesting a change of a neigh
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* attributes. The netlink message header isn't fully equipped with
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* all relevant fields and must thus be sent out via nl_send_auto_complete()
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* or supplemented as needed.
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*
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* @return 0 on success or a negative error code.
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*/
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int rtnl_cls_build_change_request(struct rtnl_cls *cls, int flags,
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struct nl_msg **result)
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{
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return cls_build(cls, RTM_NEWTFILTER, NLM_F_REPLACE | flags, result);
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}
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/**
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* Change a classifier
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* @arg sk Netlink socket.
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* @arg cls classifier to change
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* @arg flags additional netlink message flags
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*
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* Builds a netlink message by calling rtnl_cls_build_change_request(),
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* sends the request to the kernel and waits for the next ACK to be
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* received and thus blocks until the request has been processed.
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*
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* @return 0 on sucess or a negative error if an error occured.
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*/
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int rtnl_cls_change(struct nl_sock *sk, struct rtnl_cls *cls, int flags)
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{
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struct nl_msg *msg;
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int err;
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if ((err = rtnl_cls_build_change_request(cls, flags, &msg)) < 0)
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return err;
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return nl_send_sync(sk, msg);
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}
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/**
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* Build netlink message requesting the deletion of a classifier
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* @arg cls Classifier to delete
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* @arg flags Additional netlink message flags
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* @arg result Pointer to store resulting netlink message
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*
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* The behaviour of this function is identical to rtnl_cls_delete() with
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* the exception that it will not send the message but return it in the
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* provided return pointer instead.
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*
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* @see rtnl_cls_delete()
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*
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* @return 0 on success or a negative error code.
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*/
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int rtnl_cls_build_delete_request(struct rtnl_cls *cls, int flags,
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struct nl_msg **result)
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{
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uint32_t required = CLS_ATTR_PRIO;
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if ((cls->ce_mask & required) != required) {
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APPBUG("prio must be specified");
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return -NLE_MISSING_ATTR;
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}
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return cls_build(cls, RTM_DELTFILTER, flags, result);
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}
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/**
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* Delete classifier
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* @arg sk Netlink socket
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* @arg cls Classifier to delete
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* @arg flags Additional netlink message flags
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*
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* Builds a \c RTM_DELTFILTER netlink message requesting the deletion
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* of a classifier and sends the message to the kernel.
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*
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* The message is constructed out of the following attributes:
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* - \c ifindex (required)
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* - \c prio (required)
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* - \c protocol (required)
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* - \c handle (required)
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* - \c parent (optional, if not specified parent equals root-qdisc)
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* - \c kind (optional, must match if provided)
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*
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* All other classifier attributes including all class type specific
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* attributes are ignored.
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*
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* After sending, the function will wait for the ACK or an eventual
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* error message to be received and will therefore block until the
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* operation has been completed.
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*
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* @note Disabling auto-ack (nl_socket_disable_auto_ack()) will cause
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* this function to return immediately after sending. In this case,
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* it is the responsibility of the caller to handle any error
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* messages returned.
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*
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* @return 0 on success or a negative error code.
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*/
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int rtnl_cls_delete(struct nl_sock *sk, struct rtnl_cls *cls, int flags)
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{
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struct nl_msg *msg;
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int err;
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if ((err = rtnl_cls_build_delete_request(cls, flags, &msg)) < 0)
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return err;
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return nl_send_sync(sk, msg);
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}
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/** @} */
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/**
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* @name Cache Related Functions
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* @{
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*/
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/**
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* Allocate a cache and fill it with all configured classifiers
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* @arg sk Netlink socket
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* @arg ifindex Interface index of the network device
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* @arg parent Parent qdisc/traffic class class
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* @arg result Pointer to store the created cache
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*
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* Allocates a new classifier cache and fills it with a list of all
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* configured classifier attached to the specified parent qdisc/traffic
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* class on the specified network device. Release the cache with
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* nl_cache_free().
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*
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* @return 0 on success or a negative error code.
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*/
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int rtnl_cls_alloc_cache(struct nl_sock *sk, int ifindex, uint32_t parent,
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struct nl_cache **result)
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{
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struct nl_cache * cache;
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int err;
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if (!(cache = nl_cache_alloc(&rtnl_cls_ops)))
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return -NLE_NOMEM;
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cache->c_iarg1 = ifindex;
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cache->c_iarg2 = parent;
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if (sk && (err = nl_cache_refill(sk, cache)) < 0) {
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nl_cache_free(cache);
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return err;
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}
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*result = cache;
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return 0;
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}
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/**
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* Set interface index and parent handle for classifier cache.
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* @arg cache Pointer to cache
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* @arg parent Parent qdisc/traffic class class
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*
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* Set the interface index and parent handle of a classifier cache.
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* This is useful for reusing some existed classifier cache to reduce
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* the overhead introduced by memory allocation.
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*
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* @return void.
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*/
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void rtnl_cls_cache_set_tc_params(struct nl_cache *cache,
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int ifindex, uint32_t parent)
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{
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cache->c_iarg1 = ifindex;
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cache->c_iarg2 = parent;
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}
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/** @} */
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static void cls_dump_line(struct rtnl_tc *tc, struct nl_dump_params *p)
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{
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struct rtnl_cls *cls = (struct rtnl_cls *) tc;
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char buf[32];
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nl_dump(p, " prio %u protocol %s", cls->c_prio,
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nl_ether_proto2str(cls->c_protocol, buf, sizeof(buf)));
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}
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static int cls_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
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struct nlmsghdr *nlh, struct nl_parser_param *pp)
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{
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struct rtnl_cls *cls;
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int err;
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if (!(cls = rtnl_cls_alloc()))
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return -NLE_NOMEM;
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if ((err = rtnl_tc_msg_parse(nlh, TC_CAST(cls))) < 0)
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goto errout;
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cls->c_prio = TC_H_MAJ(cls->c_info) >> 16;
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if (cls->c_prio)
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cls->ce_mask |= CLS_ATTR_PRIO;
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cls->c_protocol = ntohs(TC_H_MIN(cls->c_info));
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if (cls->c_protocol)
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cls->ce_mask |= CLS_ATTR_PROTOCOL;
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err = pp->pp_cb(OBJ_CAST(cls), pp);
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errout:
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rtnl_cls_put(cls);
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return err;
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}
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static int cls_request_update(struct nl_cache *cache, struct nl_sock *sk)
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{
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struct tcmsg tchdr = {
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.tcm_family = AF_UNSPEC,
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.tcm_ifindex = cache->c_iarg1,
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.tcm_parent = cache->c_iarg2,
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};
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return nl_send_simple(sk, RTM_GETTFILTER, NLM_F_DUMP, &tchdr,
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sizeof(tchdr));
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}
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static struct rtnl_tc_type_ops cls_ops = {
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.tt_type = RTNL_TC_TYPE_CLS,
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.tt_dump_prefix = "cls",
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.tt_dump = {
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[NL_DUMP_LINE] = cls_dump_line,
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},
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};
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static struct nl_cache_ops rtnl_cls_ops = {
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.co_name = "route/cls",
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.co_hdrsize = sizeof(struct tcmsg),
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.co_msgtypes = {
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{ RTM_NEWTFILTER, NL_ACT_NEW, "new" },
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{ RTM_DELTFILTER, NL_ACT_DEL, "del" },
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{ RTM_GETTFILTER, NL_ACT_GET, "get" },
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END_OF_MSGTYPES_LIST,
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},
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.co_protocol = NETLINK_ROUTE,
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.co_groups = tc_groups,
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.co_request_update = cls_request_update,
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.co_msg_parser = cls_msg_parser,
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.co_obj_ops = &cls_obj_ops,
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};
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static struct nl_object_ops cls_obj_ops = {
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.oo_name = "route/cls",
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.oo_size = sizeof(struct rtnl_cls),
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.oo_free_data = rtnl_tc_free_data,
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.oo_clone = rtnl_tc_clone,
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.oo_dump = {
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[NL_DUMP_LINE] = rtnl_tc_dump_line,
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[NL_DUMP_DETAILS] = rtnl_tc_dump_details,
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[NL_DUMP_STATS] = rtnl_tc_dump_stats,
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},
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.oo_compare = rtnl_tc_compare,
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.oo_id_attrs = (TCA_ATTR_IFINDEX | TCA_ATTR_HANDLE),
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};
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static void __init cls_init(void)
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{
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rtnl_tc_type_register(&cls_ops);
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nl_cache_mngt_register(&rtnl_cls_ops);
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}
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static void __exit cls_exit(void)
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{
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nl_cache_mngt_unregister(&rtnl_cls_ops);
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rtnl_tc_type_unregister(&cls_ops);
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}
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/** @} */
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