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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Wei Yongjun](/assets/img/avatar_default.png)
Remove duplicated include. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
627 lines
14 KiB
C
627 lines
14 KiB
C
/*
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* net/sched/cls_api.c Packet classifier API.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Changes:
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*
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* Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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/* The list of all installed classifier types */
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static struct tcf_proto_ops *tcf_proto_base __read_mostly;
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/* Protects list of registered TC modules. It is pure SMP lock. */
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static DEFINE_RWLOCK(cls_mod_lock);
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/* Find classifier type by string name */
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static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
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{
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const struct tcf_proto_ops *t = NULL;
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if (kind) {
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read_lock(&cls_mod_lock);
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for (t = tcf_proto_base; t; t = t->next) {
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if (nla_strcmp(kind, t->kind) == 0) {
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if (!try_module_get(t->owner))
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t = NULL;
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break;
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}
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}
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read_unlock(&cls_mod_lock);
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}
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return t;
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}
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/* Register(unregister) new classifier type */
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int register_tcf_proto_ops(struct tcf_proto_ops *ops)
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{
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struct tcf_proto_ops *t, **tp;
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int rc = -EEXIST;
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write_lock(&cls_mod_lock);
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for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
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if (!strcmp(ops->kind, t->kind))
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goto out;
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ops->next = NULL;
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*tp = ops;
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rc = 0;
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out:
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write_unlock(&cls_mod_lock);
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return rc;
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}
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EXPORT_SYMBOL(register_tcf_proto_ops);
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int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
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{
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struct tcf_proto_ops *t, **tp;
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int rc = -ENOENT;
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write_lock(&cls_mod_lock);
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for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
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if (t == ops)
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break;
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if (!t)
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goto out;
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*tp = t->next;
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rc = 0;
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out:
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write_unlock(&cls_mod_lock);
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return rc;
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}
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EXPORT_SYMBOL(unregister_tcf_proto_ops);
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static int tfilter_notify(struct net *net, struct sk_buff *oskb,
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struct nlmsghdr *n, struct tcf_proto *tp,
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unsigned long fh, int event);
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/* Select new prio value from the range, managed by kernel. */
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static inline u32 tcf_auto_prio(struct tcf_proto *tp)
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{
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u32 first = TC_H_MAKE(0xC0000000U, 0U);
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if (tp)
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first = tp->prio - 1;
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return first;
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}
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/* Add/change/delete/get a filter node */
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static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
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{
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struct net *net = sock_net(skb->sk);
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struct nlattr *tca[TCA_MAX + 1];
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spinlock_t *root_lock;
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struct tcmsg *t;
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u32 protocol;
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u32 prio;
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u32 nprio;
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u32 parent;
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struct net_device *dev;
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struct Qdisc *q;
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struct tcf_proto **back, **chain;
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struct tcf_proto *tp;
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const struct tcf_proto_ops *tp_ops;
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const struct Qdisc_class_ops *cops;
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unsigned long cl;
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unsigned long fh;
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int err;
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int tp_created = 0;
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if ((n->nlmsg_type != RTM_GETTFILTER) && !capable(CAP_NET_ADMIN))
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return -EPERM;
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replay:
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err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL);
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if (err < 0)
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return err;
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t = nlmsg_data(n);
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protocol = TC_H_MIN(t->tcm_info);
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prio = TC_H_MAJ(t->tcm_info);
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nprio = prio;
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parent = t->tcm_parent;
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cl = 0;
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if (prio == 0) {
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/* If no priority is given, user wants we allocated it. */
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if (n->nlmsg_type != RTM_NEWTFILTER ||
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!(n->nlmsg_flags & NLM_F_CREATE))
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return -ENOENT;
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prio = TC_H_MAKE(0x80000000U, 0U);
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}
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/* Find head of filter chain. */
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/* Find link */
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dev = __dev_get_by_index(net, t->tcm_ifindex);
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if (dev == NULL)
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return -ENODEV;
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/* Find qdisc */
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if (!parent) {
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q = dev->qdisc;
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parent = q->handle;
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} else {
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q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
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if (q == NULL)
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return -EINVAL;
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}
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/* Is it classful? */
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cops = q->ops->cl_ops;
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if (!cops)
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return -EINVAL;
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if (cops->tcf_chain == NULL)
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return -EOPNOTSUPP;
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/* Do we search for filter, attached to class? */
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if (TC_H_MIN(parent)) {
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cl = cops->get(q, parent);
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if (cl == 0)
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return -ENOENT;
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}
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/* And the last stroke */
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chain = cops->tcf_chain(q, cl);
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err = -EINVAL;
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if (chain == NULL)
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goto errout;
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/* Check the chain for existence of proto-tcf with this priority */
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for (back = chain; (tp = *back) != NULL; back = &tp->next) {
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if (tp->prio >= prio) {
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if (tp->prio == prio) {
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if (!nprio ||
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(tp->protocol != protocol && protocol))
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goto errout;
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} else
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tp = NULL;
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break;
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}
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}
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root_lock = qdisc_root_sleeping_lock(q);
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if (tp == NULL) {
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/* Proto-tcf does not exist, create new one */
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if (tca[TCA_KIND] == NULL || !protocol)
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goto errout;
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err = -ENOENT;
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if (n->nlmsg_type != RTM_NEWTFILTER ||
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!(n->nlmsg_flags & NLM_F_CREATE))
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goto errout;
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/* Create new proto tcf */
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err = -ENOBUFS;
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tp = kzalloc(sizeof(*tp), GFP_KERNEL);
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if (tp == NULL)
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goto errout;
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err = -ENOENT;
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tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
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if (tp_ops == NULL) {
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#ifdef CONFIG_MODULES
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struct nlattr *kind = tca[TCA_KIND];
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char name[IFNAMSIZ];
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if (kind != NULL &&
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nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
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rtnl_unlock();
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request_module("cls_%s", name);
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rtnl_lock();
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tp_ops = tcf_proto_lookup_ops(kind);
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/* We dropped the RTNL semaphore in order to
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* perform the module load. So, even if we
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* succeeded in loading the module we have to
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* replay the request. We indicate this using
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* -EAGAIN.
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*/
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if (tp_ops != NULL) {
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module_put(tp_ops->owner);
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err = -EAGAIN;
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}
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}
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#endif
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kfree(tp);
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goto errout;
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}
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tp->ops = tp_ops;
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tp->protocol = protocol;
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tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
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tp->q = q;
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tp->classify = tp_ops->classify;
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tp->classid = parent;
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err = tp_ops->init(tp);
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if (err != 0) {
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module_put(tp_ops->owner);
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kfree(tp);
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goto errout;
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}
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tp_created = 1;
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} else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
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goto errout;
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fh = tp->ops->get(tp, t->tcm_handle);
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if (fh == 0) {
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if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
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spin_lock_bh(root_lock);
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*back = tp->next;
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spin_unlock_bh(root_lock);
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tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
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tcf_destroy(tp);
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err = 0;
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goto errout;
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}
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err = -ENOENT;
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if (n->nlmsg_type != RTM_NEWTFILTER ||
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!(n->nlmsg_flags & NLM_F_CREATE))
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goto errout;
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} else {
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switch (n->nlmsg_type) {
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case RTM_NEWTFILTER:
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err = -EEXIST;
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if (n->nlmsg_flags & NLM_F_EXCL) {
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if (tp_created)
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tcf_destroy(tp);
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goto errout;
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}
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break;
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case RTM_DELTFILTER:
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err = tp->ops->delete(tp, fh);
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if (err == 0)
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tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
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goto errout;
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case RTM_GETTFILTER:
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err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
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goto errout;
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default:
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err = -EINVAL;
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goto errout;
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}
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}
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err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh);
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if (err == 0) {
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if (tp_created) {
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spin_lock_bh(root_lock);
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tp->next = *back;
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*back = tp;
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spin_unlock_bh(root_lock);
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}
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tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
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} else {
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if (tp_created)
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tcf_destroy(tp);
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}
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errout:
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if (cl)
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cops->put(q, cl);
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if (err == -EAGAIN)
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/* Replay the request. */
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goto replay;
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return err;
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}
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static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp,
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unsigned long fh, u32 portid, u32 seq, u16 flags, int event)
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{
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struct tcmsg *tcm;
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struct nlmsghdr *nlh;
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unsigned char *b = skb_tail_pointer(skb);
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
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if (!nlh)
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goto out_nlmsg_trim;
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tcm = nlmsg_data(nlh);
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tcm->tcm_family = AF_UNSPEC;
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tcm->tcm__pad1 = 0;
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tcm->tcm__pad2 = 0;
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tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
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tcm->tcm_parent = tp->classid;
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tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
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if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
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goto nla_put_failure;
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tcm->tcm_handle = fh;
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if (RTM_DELTFILTER != event) {
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tcm->tcm_handle = 0;
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if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
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goto nla_put_failure;
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}
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nlh->nlmsg_len = skb_tail_pointer(skb) - b;
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return skb->len;
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out_nlmsg_trim:
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nla_put_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static int tfilter_notify(struct net *net, struct sk_buff *oskb,
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struct nlmsghdr *n, struct tcf_proto *tp,
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unsigned long fh, int event)
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{
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struct sk_buff *skb;
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u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
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skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!skb)
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return -ENOBUFS;
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if (tcf_fill_node(skb, tp, fh, portid, n->nlmsg_seq, 0, event) <= 0) {
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kfree_skb(skb);
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return -EINVAL;
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}
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return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
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n->nlmsg_flags & NLM_F_ECHO);
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}
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struct tcf_dump_args {
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struct tcf_walker w;
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struct sk_buff *skb;
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struct netlink_callback *cb;
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};
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static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
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struct tcf_walker *arg)
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{
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struct tcf_dump_args *a = (void *)arg;
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return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).portid,
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a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
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}
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/* called with RTNL */
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static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct net *net = sock_net(skb->sk);
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int t;
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int s_t;
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struct net_device *dev;
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struct Qdisc *q;
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struct tcf_proto *tp, **chain;
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struct tcmsg *tcm = nlmsg_data(cb->nlh);
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unsigned long cl = 0;
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const struct Qdisc_class_ops *cops;
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struct tcf_dump_args arg;
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if (nlmsg_len(cb->nlh) < sizeof(*tcm))
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return skb->len;
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dev = __dev_get_by_index(net, tcm->tcm_ifindex);
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if (!dev)
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return skb->len;
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if (!tcm->tcm_parent)
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q = dev->qdisc;
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else
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q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
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if (!q)
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goto out;
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cops = q->ops->cl_ops;
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if (!cops)
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goto errout;
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if (cops->tcf_chain == NULL)
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goto errout;
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if (TC_H_MIN(tcm->tcm_parent)) {
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cl = cops->get(q, tcm->tcm_parent);
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if (cl == 0)
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goto errout;
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}
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chain = cops->tcf_chain(q, cl);
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if (chain == NULL)
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goto errout;
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s_t = cb->args[0];
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for (tp = *chain, t = 0; tp; tp = tp->next, t++) {
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if (t < s_t)
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continue;
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if (TC_H_MAJ(tcm->tcm_info) &&
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TC_H_MAJ(tcm->tcm_info) != tp->prio)
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continue;
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if (TC_H_MIN(tcm->tcm_info) &&
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TC_H_MIN(tcm->tcm_info) != tp->protocol)
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continue;
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if (t > s_t)
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memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
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if (cb->args[1] == 0) {
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if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI,
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RTM_NEWTFILTER) <= 0)
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break;
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cb->args[1] = 1;
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}
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if (tp->ops->walk == NULL)
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continue;
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arg.w.fn = tcf_node_dump;
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arg.skb = skb;
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arg.cb = cb;
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arg.w.stop = 0;
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arg.w.skip = cb->args[1] - 1;
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arg.w.count = 0;
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tp->ops->walk(tp, &arg.w);
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cb->args[1] = arg.w.count + 1;
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if (arg.w.stop)
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break;
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}
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cb->args[0] = t;
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errout:
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if (cl)
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cops->put(q, cl);
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out:
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return skb->len;
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}
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void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
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{
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#ifdef CONFIG_NET_CLS_ACT
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if (exts->action) {
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tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
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exts->action = NULL;
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}
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#endif
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}
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EXPORT_SYMBOL(tcf_exts_destroy);
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int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
|
|
struct nlattr *rate_tlv, struct tcf_exts *exts,
|
|
const struct tcf_ext_map *map)
|
|
{
|
|
memset(exts, 0, sizeof(*exts));
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
{
|
|
struct tc_action *act;
|
|
|
|
if (map->police && tb[map->police]) {
|
|
act = tcf_action_init_1(net, tb[map->police], rate_tlv,
|
|
"police", TCA_ACT_NOREPLACE,
|
|
TCA_ACT_BIND);
|
|
if (IS_ERR(act))
|
|
return PTR_ERR(act);
|
|
|
|
act->type = TCA_OLD_COMPAT;
|
|
exts->action = act;
|
|
} else if (map->action && tb[map->action]) {
|
|
act = tcf_action_init(net, tb[map->action], rate_tlv,
|
|
NULL, TCA_ACT_NOREPLACE,
|
|
TCA_ACT_BIND);
|
|
if (IS_ERR(act))
|
|
return PTR_ERR(act);
|
|
|
|
exts->action = act;
|
|
}
|
|
}
|
|
#else
|
|
if ((map->action && tb[map->action]) ||
|
|
(map->police && tb[map->police]))
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_validate);
|
|
|
|
void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
|
|
struct tcf_exts *src)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (src->action) {
|
|
struct tc_action *act;
|
|
tcf_tree_lock(tp);
|
|
act = dst->action;
|
|
dst->action = src->action;
|
|
tcf_tree_unlock(tp);
|
|
if (act)
|
|
tcf_action_destroy(act, TCA_ACT_UNBIND);
|
|
}
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_change);
|
|
|
|
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
|
|
const struct tcf_ext_map *map)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (map->action && exts->action) {
|
|
/*
|
|
* again for backward compatible mode - we want
|
|
* to work with both old and new modes of entering
|
|
* tc data even if iproute2 was newer - jhs
|
|
*/
|
|
struct nlattr *nest;
|
|
|
|
if (exts->action->type != TCA_OLD_COMPAT) {
|
|
nest = nla_nest_start(skb, map->action);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
} else if (map->police) {
|
|
nest = nla_nest_start(skb, map->police);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
}
|
|
#endif
|
|
return 0;
|
|
nla_put_failure: __attribute__ ((unused))
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_dump);
|
|
|
|
|
|
int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
|
|
const struct tcf_ext_map *map)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (exts->action)
|
|
if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
return 0;
|
|
nla_put_failure: __attribute__ ((unused))
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_dump_stats);
|
|
|
|
static int __init tc_filter_init(void)
|
|
{
|
|
rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
|
|
tc_dump_tfilter, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(tc_filter_init);
|