mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 15:46:39 +07:00
1e052be69d
Kernel automatically creates a tp for each (kind, protocol, priority) tuple, which has handle 0, when we add a new filter, but it still is left there after we remove our own, unless we don't specify the handle (literally means all the filters under the tuple). For example this one is left: # tc filter show dev eth0 filter parent 8001: protocol arp pref 49152 basic The user-space is hard to clean up these for kernel because filters like u32 are organized in a complex way. So kernel is responsible to remove it after all filters are gone. Each type of filter has its own way to store the filters, so each type has to provide its way to check if all filters are gone. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <cwang@twopensource.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Jamal Hadi Salim<jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
631 lines
14 KiB
C
631 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 LIST_HEAD(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 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, *res = NULL;
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if (kind) {
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read_lock(&cls_mod_lock);
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list_for_each_entry(t, &tcf_proto_base, head) {
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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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res = t;
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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 res;
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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;
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int rc = -EEXIST;
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write_lock(&cls_mod_lock);
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list_for_each_entry(t, &tcf_proto_base, head)
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if (!strcmp(ops->kind, t->kind))
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goto out;
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list_add_tail(&ops->head, &tcf_proto_base);
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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;
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int rc = -ENOENT;
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write_lock(&cls_mod_lock);
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list_for_each_entry(t, &tcf_proto_base, head) {
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if (t == ops) {
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list_del(&t->head);
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rc = 0;
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break;
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}
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}
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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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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 __rcu **back;
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struct tcf_proto __rcu **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) &&
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!netlink_ns_capable(skb, net->user_ns, 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;
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(tp = rtnl_dereference(*back)) != NULL;
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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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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 ? :
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TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*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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struct tcf_proto *next = rtnl_dereference(tp->next);
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RCU_INIT_POINTER(*back, next);
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tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
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tcf_destroy(tp, true);
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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, true);
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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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if (tcf_destroy(tp, false)) {
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struct tcf_proto *next = rtnl_dereference(tp->next);
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RCU_INIT_POINTER(*back, next);
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}
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}
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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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n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
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if (err == 0) {
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if (tp_created) {
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RCU_INIT_POINTER(tp->next, rtnl_dereference(*back));
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rcu_assign_pointer(*back, tp);
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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, true);
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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 net *net, 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(net, 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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|
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if (tcf_fill_node(net, 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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|
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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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|
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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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struct net *net = sock_net(a->skb->sk);
|
|
|
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return tcf_fill_node(net, 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;
|
|
int s_t;
|
|
struct net_device *dev;
|
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struct Qdisc *q;
|
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struct tcf_proto *tp, __rcu **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;
|
|
|
|
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)
|
|
goto out;
|
|
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)
|
|
goto errout;
|
|
if (TC_H_MIN(tcm->tcm_parent)) {
|
|
cl = cops->get(q, tcm->tcm_parent);
|
|
if (cl == 0)
|
|
goto errout;
|
|
}
|
|
chain = cops->tcf_chain(q, cl);
|
|
if (chain == NULL)
|
|
goto errout;
|
|
|
|
s_t = cb->args[0];
|
|
|
|
for (tp = rtnl_dereference(*chain), t = 0;
|
|
tp; tp = rtnl_dereference(tp->next), t++) {
|
|
if (t < s_t)
|
|
continue;
|
|
if (TC_H_MAJ(tcm->tcm_info) &&
|
|
TC_H_MAJ(tcm->tcm_info) != tp->prio)
|
|
continue;
|
|
if (TC_H_MIN(tcm->tcm_info) &&
|
|
TC_H_MIN(tcm->tcm_info) != tp->protocol)
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|
continue;
|
|
if (t > s_t)
|
|
memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
|
|
if (cb->args[1] == 0) {
|
|
if (tcf_fill_node(net, skb, tp, 0, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
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RTM_NEWTFILTER) <= 0)
|
|
break;
|
|
|
|
cb->args[1] = 1;
|
|
}
|
|
if (tp->ops->walk == NULL)
|
|
continue;
|
|
arg.w.fn = tcf_node_dump;
|
|
arg.skb = skb;
|
|
arg.cb = cb;
|
|
arg.w.stop = 0;
|
|
arg.w.skip = cb->args[1] - 1;
|
|
arg.w.count = 0;
|
|
tp->ops->walk(tp, &arg.w);
|
|
cb->args[1] = arg.w.count + 1;
|
|
if (arg.w.stop)
|
|
break;
|
|
}
|
|
|
|
cb->args[0] = t;
|
|
|
|
errout:
|
|
if (cl)
|
|
cops->put(q, cl);
|
|
out:
|
|
return skb->len;
|
|
}
|
|
|
|
void tcf_exts_destroy(struct tcf_exts *exts)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
tcf_action_destroy(&exts->actions, TCA_ACT_UNBIND);
|
|
INIT_LIST_HEAD(&exts->actions);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_destroy);
|
|
|
|
int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
|
|
struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
{
|
|
struct tc_action *act;
|
|
|
|
INIT_LIST_HEAD(&exts->actions);
|
|
if (exts->police && tb[exts->police]) {
|
|
act = tcf_action_init_1(net, tb[exts->police], rate_tlv,
|
|
"police", ovr,
|
|
TCA_ACT_BIND);
|
|
if (IS_ERR(act))
|
|
return PTR_ERR(act);
|
|
|
|
act->type = exts->type = TCA_OLD_COMPAT;
|
|
list_add(&act->list, &exts->actions);
|
|
} else if (exts->action && tb[exts->action]) {
|
|
int err;
|
|
err = tcf_action_init(net, tb[exts->action], rate_tlv,
|
|
NULL, ovr,
|
|
TCA_ACT_BIND, &exts->actions);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
#else
|
|
if ((exts->action && tb[exts->action]) ||
|
|
(exts->police && tb[exts->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
|
|
LIST_HEAD(tmp);
|
|
tcf_tree_lock(tp);
|
|
list_splice_init(&dst->actions, &tmp);
|
|
list_splice(&src->actions, &dst->actions);
|
|
dst->type = src->type;
|
|
tcf_tree_unlock(tp);
|
|
tcf_action_destroy(&tmp, TCA_ACT_UNBIND);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_change);
|
|
|
|
#define tcf_exts_first_act(ext) \
|
|
list_first_entry_or_null(&(exts)->actions, \
|
|
struct tc_action, list)
|
|
|
|
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
struct nlattr *nest;
|
|
|
|
if (exts->action && !list_empty(&exts->actions)) {
|
|
/*
|
|
* 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
|
|
*/
|
|
if (exts->type != TCA_OLD_COMPAT) {
|
|
nest = nla_nest_start(skb, exts->action);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
if (tcf_action_dump(skb, &exts->actions, 0, 0) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
} else if (exts->police) {
|
|
struct tc_action *act = tcf_exts_first_act(exts);
|
|
nest = nla_nest_start(skb, exts->police);
|
|
if (nest == NULL || !act)
|
|
goto nla_put_failure;
|
|
if (tcf_action_dump_old(skb, act, 0, 0) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(tcf_exts_dump);
|
|
|
|
|
|
int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
|
|
{
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
struct tc_action *a = tcf_exts_first_act(exts);
|
|
if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
|
|
return -1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
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);
|