Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
641 lines
14 KiB
C
641 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 <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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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/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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#if 0 /* control */
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#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
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#else
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#define DPRINTK(format,args...)
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#endif
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/* The list of all installed classifier types */
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static struct tcf_proto_ops *tcf_proto_base;
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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 struct tcf_proto_ops * tcf_proto_lookup_ops(struct rtattr *kind)
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{
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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 (rtattr_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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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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static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
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struct tcf_proto *tp, 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, void *arg)
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{
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struct rtattr **tca;
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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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struct tcf_proto_ops *tp_ops;
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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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replay:
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tca = arg;
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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 || !(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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if ((dev = __dev_get_by_index(t->tcm_ifindex)) == 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_sleeping;
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parent = q->handle;
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} else if ((q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent))) == NULL)
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return -EINVAL;
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/* Is it classful? */
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if ((cops = q->ops->cl_ops) == NULL)
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return -EINVAL;
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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 || (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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if (tp == NULL) {
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/* Proto-tcf does not exist, create new one */
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if (tca[TCA_KIND-1] == NULL || !protocol)
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goto errout;
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err = -ENOENT;
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if (n->nlmsg_type != RTM_NEWTFILTER || !(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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if ((tp = kzalloc(sizeof(*tp), GFP_KERNEL)) == NULL)
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goto errout;
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err = -EINVAL;
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tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND-1]);
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if (tp_ops == NULL) {
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#ifdef CONFIG_KMOD
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struct rtattr *kind = tca[TCA_KIND-1];
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char name[IFNAMSIZ];
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if (kind != NULL &&
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rtattr_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 ? : 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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if ((err = tp_ops->init(tp)) != 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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qdisc_lock_tree(dev);
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tp->next = *back;
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*back = tp;
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qdisc_unlock_tree(dev);
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} else if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], 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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qdisc_lock_tree(dev);
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*back = tp->next;
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qdisc_unlock_tree(dev);
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tfilter_notify(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 || !(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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goto errout;
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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(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(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(tp, cl, t->tcm_handle, tca, &fh);
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if (err == 0)
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tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
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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
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tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, unsigned long fh,
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u32 pid, 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;
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nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
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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__pad1 = 0;
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tcm->tcm_ifindex = tp->q->dev->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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RTA_PUT(skb, TCA_KIND, IFNAMSIZ, tp->ops->kind);
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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 rtattr_failure;
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}
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nlh->nlmsg_len = skb->tail - b;
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return skb->len;
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nlmsg_failure:
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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}
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static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
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struct tcf_proto *tp, unsigned long fh, int event)
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{
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struct sk_buff *skb;
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u32 pid = oskb ? NETLINK_CB(oskb).pid : 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, pid, 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, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
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}
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struct tcf_dump_args
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{
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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, 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).pid,
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a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
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}
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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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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 = (struct tcmsg*)NLMSG_DATA(cb->nlh);
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unsigned long cl = 0;
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struct Qdisc_class_ops *cops;
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struct tcf_dump_args arg;
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if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
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return skb->len;
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if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL)
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return skb->len;
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read_lock(&qdisc_tree_lock);
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if (!tcm->tcm_parent)
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q = dev->qdisc_sleeping;
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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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if ((cops = q->ops->cl_ops) == 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) 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).pid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER) <= 0) {
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break;
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}
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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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read_unlock(&qdisc_tree_lock);
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dev_put(dev);
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return skb->len;
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}
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void
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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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#elif defined CONFIG_NET_CLS_POLICE
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if (exts->police) {
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tcf_police_release(exts->police, TCA_ACT_UNBIND);
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exts->police = NULL;
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}
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#endif
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}
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int
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tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb,
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struct rtattr *rate_tlv, struct tcf_exts *exts,
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struct tcf_ext_map *map)
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{
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memset(exts, 0, sizeof(*exts));
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#ifdef CONFIG_NET_CLS_ACT
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{
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int err;
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struct tc_action *act;
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if (map->police && tb[map->police-1]) {
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act = tcf_action_init_1(tb[map->police-1], rate_tlv, "police",
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TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err);
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if (act == NULL)
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return err;
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act->type = TCA_OLD_COMPAT;
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exts->action = act;
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} else if (map->action && tb[map->action-1]) {
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act = tcf_action_init(tb[map->action-1], rate_tlv, NULL,
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TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err);
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if (act == NULL)
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return err;
|
|
|
|
exts->action = act;
|
|
}
|
|
}
|
|
#elif defined CONFIG_NET_CLS_POLICE
|
|
if (map->police && tb[map->police-1]) {
|
|
struct tcf_police *p;
|
|
|
|
p = tcf_police_locate(tb[map->police-1], rate_tlv);
|
|
if (p == NULL)
|
|
return -EINVAL;
|
|
|
|
exts->police = p;
|
|
} else if (map->action && tb[map->action-1])
|
|
return -EOPNOTSUPP;
|
|
#else
|
|
if ((map->action && tb[map->action-1]) ||
|
|
(map->police && tb[map->police-1]))
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 = xchg(&dst->action, src->action);
|
|
tcf_tree_unlock(tp);
|
|
if (act)
|
|
tcf_action_destroy(act, TCA_ACT_UNBIND);
|
|
}
|
|
#elif defined CONFIG_NET_CLS_POLICE
|
|
if (src->police) {
|
|
struct tcf_police *p;
|
|
tcf_tree_lock(tp);
|
|
p = xchg(&dst->police, src->police);
|
|
tcf_tree_unlock(tp);
|
|
if (p)
|
|
tcf_police_release(p, TCA_ACT_UNBIND);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
int
|
|
tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
|
|
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 rtattr * p_rta = (struct rtattr*) skb->tail;
|
|
|
|
if (exts->action->type != TCA_OLD_COMPAT) {
|
|
RTA_PUT(skb, map->action, 0, NULL);
|
|
if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
|
|
goto rtattr_failure;
|
|
p_rta->rta_len = skb->tail - (u8*)p_rta;
|
|
} else if (map->police) {
|
|
RTA_PUT(skb, map->police, 0, NULL);
|
|
if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
|
|
goto rtattr_failure;
|
|
p_rta->rta_len = skb->tail - (u8*)p_rta;
|
|
}
|
|
}
|
|
#elif defined CONFIG_NET_CLS_POLICE
|
|
if (map->police && exts->police) {
|
|
struct rtattr * p_rta = (struct rtattr*) skb->tail;
|
|
|
|
RTA_PUT(skb, map->police, 0, NULL);
|
|
|
|
if (tcf_police_dump(skb, exts->police) < 0)
|
|
goto rtattr_failure;
|
|
|
|
p_rta->rta_len = skb->tail - (u8*)p_rta;
|
|
}
|
|
#endif
|
|
return 0;
|
|
rtattr_failure: __attribute__ ((unused))
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
|
|
struct tcf_ext_map *map)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (exts->action)
|
|
if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
|
|
goto rtattr_failure;
|
|
#elif defined CONFIG_NET_CLS_POLICE
|
|
if (exts->police)
|
|
if (tcf_police_dump_stats(skb, exts->police) < 0)
|
|
goto rtattr_failure;
|
|
#endif
|
|
return 0;
|
|
rtattr_failure: __attribute__ ((unused))
|
|
return -1;
|
|
}
|
|
|
|
static int __init tc_filter_init(void)
|
|
{
|
|
struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
|
|
|
|
/* Setup rtnetlink links. It is made here to avoid
|
|
exporting large number of public symbols.
|
|
*/
|
|
|
|
if (link_p) {
|
|
link_p[RTM_NEWTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
|
|
link_p[RTM_DELTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
|
|
link_p[RTM_GETTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
|
|
link_p[RTM_GETTFILTER-RTM_BASE].dumpit = tc_dump_tfilter;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(tc_filter_init);
|
|
|
|
EXPORT_SYMBOL(register_tcf_proto_ops);
|
|
EXPORT_SYMBOL(unregister_tcf_proto_ops);
|
|
EXPORT_SYMBOL(tcf_exts_validate);
|
|
EXPORT_SYMBOL(tcf_exts_destroy);
|
|
EXPORT_SYMBOL(tcf_exts_change);
|
|
EXPORT_SYMBOL(tcf_exts_dump);
|
|
EXPORT_SYMBOL(tcf_exts_dump_stats);
|