8a3efffa5b
In order for the interface to become more thread safe, the error
handling was revised to no longer depend on a static errno and
error string buffer.
This patch converts all error paths to return a libnl specific
error code which can be translated to a error message using
nl_geterror(int error). The functions nl_error() and
nl_get_errno() are therefore obsolete.
This change required various sets of function prototypes to be
changed in order to return an error code, the most prominent
are:
struct nl_cache *foo_alloc_cache(...);
changed to:
int foo_alloc_cache(..., struct nl_cache **);
struct nl_msg *foo_build_request(...);
changed to:
int foo_build_request(..., struct nl_msg **);
struct foo *foo_parse(...);
changed to:
int foo_parse(..., struct foo **);
This pretty much only leaves trivial allocation functions to
still return a pointer object which can still return NULL to
signal out of memory.
This change is a serious API and ABI breaker, sorry!
343 lines
8.5 KiB
C
343 lines
8.5 KiB
C
/*
|
|
* 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) 2003-2008 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>
|
|
|
|
static struct nl_cache_ops rtnl_cls_ops;
|
|
|
|
static int cls_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
|
|
struct nlmsghdr *nlh, struct nl_parser_param *pp)
|
|
{
|
|
int err;
|
|
struct rtnl_cls *cls;
|
|
struct rtnl_cls_ops *cops;
|
|
|
|
cls = rtnl_cls_alloc();
|
|
if (!cls) {
|
|
err = -NLE_NOMEM;
|
|
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));
|
|
|
|
cops = rtnl_cls_lookup_ops(cls);
|
|
if (cops && cops->co_msg_parser) {
|
|
err = cops->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;
|
|
|
|
err = 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 int cls_build(struct rtnl_cls *cls, int type, int flags,
|
|
struct nl_msg **result)
|
|
{
|
|
struct rtnl_cls_ops *cops;
|
|
int err, prio, proto;
|
|
struct tcmsg *tchdr;
|
|
|
|
err = tca_build_msg((struct rtnl_tca *) cls, type, flags, result);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tchdr = nlmsg_data(nlmsg_hdr(*result));
|
|
prio = rtnl_cls_get_prio(cls);
|
|
proto = rtnl_cls_get_protocol(cls);
|
|
tchdr->tcm_info = TC_H_MAKE(prio << 16, htons(proto)),
|
|
|
|
cops = rtnl_cls_lookup_ops(cls);
|
|
if (cops && cops->co_get_opts) {
|
|
struct nl_msg *opts;
|
|
|
|
opts = cops->co_get_opts(cls);
|
|
if (opts) {
|
|
err = nla_put_nested(*result, TCA_OPTIONS, opts);
|
|
nlmsg_free(opts);
|
|
if (err < 0)
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
errout:
|
|
nlmsg_free(*result);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* @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
|
|
* @arg result Pointer to store resulting message.
|
|
*
|
|
* 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 0 on success or a negative error code.
|
|
*/
|
|
int rtnl_cls_build_add_request(struct rtnl_cls *cls, int flags,
|
|
struct nl_msg **result)
|
|
{
|
|
return cls_build(cls, RTM_NEWTFILTER, NLM_F_CREATE | flags, result);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct nl_msg *msg;
|
|
int err;
|
|
|
|
if ((err = rtnl_cls_build_add_request(cls, flags, &msg)) < 0)
|
|
return err;
|
|
|
|
if ((err = nl_send_auto_complete(handle, msg)) < 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
|
|
* @arg result Pointer to store resulting message.
|
|
*
|
|
* 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 0 on success or a negative error code.
|
|
*/
|
|
int rtnl_cls_build_change_request(struct rtnl_cls *cls, int flags,
|
|
struct nl_msg **result)
|
|
{
|
|
return cls_build(cls, RTM_NEWTFILTER, NLM_F_REPLACE | flags, result);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct nl_msg *msg;
|
|
int err;
|
|
|
|
if ((err = rtnl_cls_build_change_request(cls, flags, &msg)) < 0)
|
|
return err;
|
|
|
|
if ((err = nl_send_auto_complete(handle, msg)) < 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
|
|
* @arg result Pointer to store resulting message.
|
|
*
|
|
* 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 0 on success or a negative error code.
|
|
*/
|
|
int rtnl_cls_build_delete_request(struct rtnl_cls *cls, int flags,
|
|
struct nl_msg **result)
|
|
{
|
|
return cls_build(cls, RTM_DELTFILTER, flags, result);
|
|
}
|
|
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct nl_msg *msg;
|
|
int err;
|
|
|
|
if ((err = rtnl_cls_build_delete_request(cls, flags, &msg)) < 0)
|
|
return err;
|
|
|
|
if ((err = nl_send_auto_complete(handle, msg)) < 0)
|
|
return err;
|
|
|
|
nlmsg_free(msg);
|
|
return nl_wait_for_ack(handle);
|
|
}
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* @name Cache Management
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* 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
|
|
* @arg result Pointer to store resulting cache.
|
|
*
|
|
* 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 0 on success or a negative error code.
|
|
*/
|
|
int rtnl_cls_alloc_cache(struct nl_handle *handle, int ifindex, uint32_t parent, struct nl_cache **result)
|
|
{
|
|
struct nl_cache * cache;
|
|
int err;
|
|
|
|
if (!(cache = nl_cache_alloc(&rtnl_cls_ops)))
|
|
return -NLE_NOMEM;
|
|
|
|
cache->c_iarg1 = ifindex;
|
|
cache->c_iarg2 = parent;
|
|
|
|
if (handle && (err = nl_cache_refill(handle, cache)) < 0) {
|
|
nl_cache_free(cache);
|
|
return err;
|
|
}
|
|
|
|
*result = cache;
|
|
return 0;
|
|
}
|
|
|
|
/** @} */
|
|
|
|
static struct nl_cache_ops rtnl_cls_ops = {
|
|
.co_name = "route/cls",
|
|
.co_hdrsize = sizeof(struct tcmsg),
|
|
.co_msgtypes = {
|
|
{ RTM_NEWTFILTER, NL_ACT_NEW, "new" },
|
|
{ RTM_DELTFILTER, NL_ACT_DEL, "del" },
|
|
{ RTM_GETTFILTER, NL_ACT_GET, "get" },
|
|
END_OF_MSGTYPES_LIST,
|
|
},
|
|
.co_protocol = NETLINK_ROUTE,
|
|
.co_request_update = cls_request_update,
|
|
.co_msg_parser = cls_msg_parser,
|
|
.co_obj_ops = &cls_obj_ops,
|
|
};
|
|
|
|
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);
|
|
}
|
|
|
|
/** @} */
|