3040a1d625
This interface was internal so far which required all code defining caches to be compiled with the sources available. In order to simplify the interface, the co_msg_parser prototype was changed to take the struct nl_parser_param directly instead of a void *. It used to be void * because the co_msg_parser was directly passed as the NL_CB_VALID callback function.
477 lines
12 KiB
C
477 lines
12 KiB
C
/*
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* lib/route/qdisc.c Queueing Disciplines
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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) 2003-2006 Thomas Graf <tgraf@suug.ch>
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*/
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/**
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* @ingroup tc
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* @defgroup qdisc Queueing Disciplines
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*
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* @par Qdisc Handles
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* In general, qdiscs are identified by the major part of a traffic control
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* handle (the upper 16 bits). A few special values exist though:
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* - \c TC_H_ROOT: root qdisc (directly attached to the device)
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* - \c TC_H_INGRESS: ingress qdisc (directly attached to the device)
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* - \c TC_H_UNSPEC: unspecified qdisc (no reference)
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*
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* @par 1) Adding a Qdisc
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* @code
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* // Allocate a new empty qdisc to be filled out
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* struct rtnl_qdisc *qdisc = rtnl_qdisc_alloc();
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*
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* // ... specify the kind of the Qdisc
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* rtnl_qdisc_set_kind(qdisc, "pfifo");
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*
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* // Specify the device the qdisc should be attached to
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* rtnl_qdisc_set_ifindex(qdisc, ifindex);
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*
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* // ... specify the parent qdisc
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* rtnl_qdisc_set_parent(qdisc, TC_H_ROOT);
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*
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* // Specifying the handle is not required but makes reidentifying easier
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* // and may help to avoid adding a qdisc twice.
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* rtnl_qdisc_set_handle(qdisc, 0x000A0000);
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*
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* // Now on to specify the qdisc specific options, see the relevant qdisc
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* // modules for documentation, in this example we set the upper limit of
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* // the packet fifo qdisc to 64
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* rtnl_qdisc_fifo_set_limit(qdisc, 64);
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*
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* rtnl_qdisc_add(handle, qdisc, NLM_R_REPLACE);
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*
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* // Free up the memory
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* rtnl_qdisc_put(qdisc);
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* @endcode
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*
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* @par 2) Deleting a Qdisc
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* @code
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* // Allocate a new empty qdisc to be filled out with the parameters
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* // specifying the qdisc to be deleted. Alternatively a fully equiped
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* // Qdisc object from a cache can be used.
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* struct rtnl_qdisc *qdisc = rtnl_qdisc_alloc();
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*
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* // The interface index of the device the qdisc is on and the parent handle
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* // are the least required fields to be filled out.
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* // Note: Specify TC_H_ROOT or TC_H_INGRESS as parent handle to delete the
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* // root respectively root ingress qdisc.
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* rtnl_qdisc_set_ifindex(qdisc, ifindex);
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* rtnl_qdisc_set_parent(qdisc, parent_handle);
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*
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* // If required for identification, the handle can be specified as well.
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* rtnl_qdisc_set_handle(qdisc, qdisc_handle);
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*
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* // Not required but maybe helpful as sanity check, the kind of the qdisc
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* // can be specified to avoid mistakes.
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* rtnl_qdisc_set_kind(qdisc, "pfifo");
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*
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* // Finally delete the qdisc with rtnl_qdisc_delete(), alternatively
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* // rtnl_qdisc_build_delete_request() can be invoked to generate an
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* // appropritate netlink message to send out.
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* rtnl_qdisc_delete(handle, qdisc);
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*
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* // Free up the memory
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* rtnl_qdisc_put(qdisc);
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* @endcode
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*
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* @{
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*/
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#include <netlink-local.h>
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#include <netlink-tc.h>
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#include <netlink/netlink.h>
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#include <netlink/utils.h>
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#include <netlink/route/link.h>
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#include <netlink/route/tc.h>
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#include <netlink/route/qdisc.h>
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#include <netlink/route/class.h>
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#include <netlink/route/classifier.h>
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#include <netlink/route/qdisc-modules.h>
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static struct nl_cache_ops rtnl_qdisc_ops;
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static int qdisc_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
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struct nlmsghdr *n, struct nl_parser_param *pp)
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{
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int err = -ENOMEM;
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struct rtnl_qdisc *qdisc;
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struct rtnl_qdisc_ops *qops;
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qdisc = rtnl_qdisc_alloc();
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if (!qdisc) {
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err = nl_errno(ENOMEM);
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goto errout;
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}
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qdisc->ce_msgtype = n->nlmsg_type;
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err = tca_msg_parser(n, (struct rtnl_tca *) qdisc);
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if (err < 0)
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goto errout_free;
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qops = rtnl_qdisc_lookup_ops(qdisc);
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if (qops && qops->qo_msg_parser) {
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err = qops->qo_msg_parser(qdisc);
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if (err < 0)
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goto errout_free;
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}
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err = pp->pp_cb((struct nl_object *) qdisc, pp);
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if (err < 0)
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goto errout_free;
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return P_ACCEPT;
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errout_free:
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rtnl_qdisc_put(qdisc);
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errout:
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return err;
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}
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static int qdisc_request_update(struct nl_cache *c, struct nl_handle *h)
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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 = c->c_iarg1,
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};
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return nl_send_simple(h, RTM_GETQDISC, NLM_F_DUMP, &tchdr,
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sizeof(tchdr));
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}
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/**
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* @name QDisc Addition
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* @{
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*/
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static struct nl_msg *qdisc_build(struct rtnl_qdisc *qdisc, int type, int flags)
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{
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struct rtnl_qdisc_ops *qops;
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struct nl_msg *msg;
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int err;
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msg = tca_build_msg((struct rtnl_tca *) qdisc, type, flags);
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if (!msg)
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goto errout;
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qops = rtnl_qdisc_lookup_ops(qdisc);
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if (qops && qops->qo_get_opts) {
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struct nl_msg *opts;
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opts = qops->qo_get_opts(qdisc);
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if (opts) {
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err = nla_put_nested(msg, TCA_OPTIONS, opts);
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nlmsg_free(opts);
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if (err < 0)
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goto errout;
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}
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}
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return msg;
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errout:
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nlmsg_free(msg);
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return NULL;
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}
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/**
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* Build a netlink message to add a new qdisc
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* @arg qdisc qdisc to add
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* @arg flags additional netlink message flags
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*
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* Builds a new netlink message requesting an addition of a qdisc.
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* The netlink message header isn't fully equipped with all relevant
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* fields and must be sent out via nl_send_auto_complete() or
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* supplemented as needed.
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*
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* Common message flags used:
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* - NLM_F_REPLACE - replace a potential existing qdisc
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*
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* @return New netlink message
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*/
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struct nl_msg *rtnl_qdisc_build_add_request(struct rtnl_qdisc *qdisc,
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int flags)
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{
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struct nl_msg *msg;
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msg = qdisc_build(qdisc, RTM_NEWQDISC, NLM_F_CREATE | flags);
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if (!msg)
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nl_errno(ENOMEM);
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return msg;
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}
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/**
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* Add a new qdisc
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* @arg handle netlink handle
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* @arg qdisc qdisc to delete
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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_qdisc_build_add_request(),
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* sends the request to the kernel and waits for the 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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* Common message flags used:
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* - NLM_F_REPLACE - replace a potential existing qdisc
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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_qdisc_add(struct nl_handle *handle, struct rtnl_qdisc *qdisc,
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int flags)
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{
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struct nl_msg *msg;
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int err;
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msg = rtnl_qdisc_build_add_request(qdisc, flags);
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if (!msg)
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return nl_errno(ENOMEM);
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err = nl_send_auto_complete(handle, msg);
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if (err < 0)
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return err;
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nlmsg_free(msg);
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return nl_wait_for_ack(handle);
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}
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/** @} */
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/**
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* @name QDisc Modification
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* @{
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*/
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/**
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* Build a netlink message to change attributes of a existing qdisc
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* @arg qdisc qdisc to change
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* @arg new new qdisc attributes
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*
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* Builds a new netlink message requesting an change of qdisc
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* attributes. The netlink message header isn't fully equipped
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* with all relevant fields and must be sent out via
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* nl_send_auto_complete() or supplemented as needed.
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*
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* @return New netlink message
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*/
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struct nl_msg *rtnl_qdisc_build_change_request(struct rtnl_qdisc *qdisc,
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struct rtnl_qdisc *new)
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{
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return qdisc_build(qdisc, RTM_NEWQDISC, NLM_F_REPLACE);
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}
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/**
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* Change attributes of a qdisc
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* @arg handle netlink handle
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* @arg qdisc qdisc to change
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* @arg new new qdisc attributes
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*
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* Builds a netlink message by calling rtnl_qdisc_build_change_request(),
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* sends the request to the kernel and waits for the 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 success or a negative error code
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*/
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int rtnl_qdisc_change(struct nl_handle *handle, struct rtnl_qdisc *qdisc,
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struct rtnl_qdisc *new)
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{
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struct nl_msg *msg;
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int err;
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msg = rtnl_qdisc_build_change_request(qdisc, new);
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if (!msg)
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return nl_errno(ENOMEM);
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err = nl_send_auto_complete(handle, msg);
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if (err < 0)
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return err;
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nlmsg_free(msg);
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return nl_wait_for_ack(handle);
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}
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/** @} */
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/**
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* @name QDisc Deletion
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* @{
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*/
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/**
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* Build a netlink request message to delete a qdisc
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* @arg qdisc qdisc to delete
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*
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* Builds a new netlink message requesting a deletion of a qdisc.
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* The netlink message header isn't fully equipped with all relevant
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* 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 New netlink message
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*/
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struct nl_msg *rtnl_qdisc_build_delete_request(struct rtnl_qdisc *qdisc)
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{
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struct nl_msg *msg;
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struct tcmsg tchdr;
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int required = TCA_ATTR_IFINDEX | TCA_ATTR_PARENT;
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if ((qdisc->ce_mask & required) != required)
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BUG();
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msg = nlmsg_alloc_simple(RTM_DELQDISC, 0);
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if (!msg)
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return NULL;
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tchdr.tcm_family = AF_UNSPEC,
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tchdr.tcm_handle = qdisc->q_handle,
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tchdr.tcm_parent = qdisc->q_parent,
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tchdr.tcm_ifindex = qdisc->q_ifindex,
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nlmsg_append(msg, &tchdr, sizeof(tchdr), NLMSG_ALIGNTO);
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return msg;
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}
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/**
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* Delete a qdisc
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* @arg handle netlink handle
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* @arg qdisc qdisc to delete
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*
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* Builds a netlink message by calling rtnl_qdisc_build_delete_request(),
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* sends the request to the kernel and waits for the 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 success or a negative error code
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*/
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int rtnl_qdisc_delete(struct nl_handle *handle, struct rtnl_qdisc *qdisc)
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{
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struct nl_msg *msg;
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int err;
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msg = rtnl_qdisc_build_delete_request(qdisc);
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if (!msg)
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return nl_errno(ENOMEM);
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err = nl_send_auto_complete(handle, msg);
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if (err < 0)
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return err;
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nlmsg_free(msg);
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return nl_wait_for_ack(handle);
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}
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/** @} */
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/**
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* @name Qdisc Cache Management
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* @{
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*/
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/**
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* Build a qdisc cache including all qdiscs currently configured in
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* the kernel
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* @arg handle netlink handle
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*
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* Allocates a new cache, initializes it properly and updates it to
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* include all qdiscs currently configured in the kernel.
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*
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* @note The caller is responsible for destroying and freeing the
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* cache after using it.
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* @return The cache or NULL if an error has occured.
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*/
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struct nl_cache * rtnl_qdisc_alloc_cache(struct nl_handle *handle)
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{
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struct nl_cache * cache;
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cache = nl_cache_alloc(&rtnl_qdisc_ops);
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if (cache == NULL)
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return NULL;
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if (handle && nl_cache_refill(handle, cache) < 0) {
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nl_cache_free(cache);
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return NULL;
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}
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return cache;
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}
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/**
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* Look up qdisc by its parent in the provided cache
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* @arg cache qdisc cache
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* @arg ifindex interface the qdisc is attached to
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* @arg parent parent handle
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* @return pointer to qdisc inside the cache or NULL if no match was found.
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*/
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struct rtnl_qdisc * rtnl_qdisc_get_by_parent(struct nl_cache *cache,
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int ifindex, uint32_t parent)
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{
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struct rtnl_qdisc *q;
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if (cache->c_ops != &rtnl_qdisc_ops)
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return NULL;
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nl_list_for_each_entry(q, &cache->c_items, ce_list) {
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if (q->q_parent == parent && q->q_ifindex == ifindex) {
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nl_object_get((struct nl_object *) q);
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return q;
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}
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}
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return NULL;
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}
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/**
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* Look up qdisc by its handle in the provided cache
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* @arg cache qdisc cache
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* @arg ifindex interface the qdisc is attached to
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* @arg handle qdisc handle
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* @return pointer to qdisc inside the cache or NULL if no match was found.
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*/
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struct rtnl_qdisc * rtnl_qdisc_get(struct nl_cache *cache,
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int ifindex, uint32_t handle)
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{
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struct rtnl_qdisc *q;
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if (cache->c_ops != &rtnl_qdisc_ops)
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return NULL;
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nl_list_for_each_entry(q, &cache->c_items, ce_list) {
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if (q->q_handle == handle && q->q_ifindex == ifindex) {
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nl_object_get((struct nl_object *) q);
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return q;
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}
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}
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return NULL;
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}
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/** @} */
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static struct nl_cache_ops rtnl_qdisc_ops = {
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.co_name = "route/qdisc",
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.co_hdrsize = sizeof(struct tcmsg),
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.co_msgtypes = {
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{ RTM_NEWQDISC, NL_ACT_NEW, "new" },
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{ RTM_DELQDISC, NL_ACT_DEL, "del" },
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{ RTM_GETQDISC, 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_request_update = qdisc_request_update,
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.co_msg_parser = qdisc_msg_parser,
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.co_obj_ops = &qdisc_obj_ops,
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};
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static void __init qdisc_init(void)
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{
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nl_cache_mngt_register(&rtnl_qdisc_ops);
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}
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static void __exit qdisc_exit(void)
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{
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nl_cache_mngt_unregister(&rtnl_qdisc_ops);
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}
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/** @} */
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