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![Cong Wang](/assets/img/avatar_default.png)
Commit 05f0fe6b74
("RCU, workqueue: Implement rcu_work") introduces
new API's for dispatching work in a RCU callback. Now we can just
switch to the new API's for tc filters. This could get rid of a lot
of code.
Cc: Tejun Heo <tj@kernel.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
469 lines
10 KiB
C
469 lines
10 KiB
C
/*
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* net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
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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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* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
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* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
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* Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
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*
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* JHS: We should remove the CONFIG_NET_CLS_IND from here
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* eventually when the meta match extension is made available
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.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 <net/netlink.h>
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#include <net/act_api.h>
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#include <net/pkt_cls.h>
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#include <net/sch_generic.h>
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#define HTSIZE 256
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struct fw_head {
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u32 mask;
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struct fw_filter __rcu *ht[HTSIZE];
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struct rcu_head rcu;
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};
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struct fw_filter {
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struct fw_filter __rcu *next;
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u32 id;
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struct tcf_result res;
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#ifdef CONFIG_NET_CLS_IND
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int ifindex;
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#endif /* CONFIG_NET_CLS_IND */
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struct tcf_exts exts;
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struct tcf_proto *tp;
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struct rcu_work rwork;
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};
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static u32 fw_hash(u32 handle)
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{
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handle ^= (handle >> 16);
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handle ^= (handle >> 8);
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return handle % HTSIZE;
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}
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static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct fw_head *head = rcu_dereference_bh(tp->root);
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struct fw_filter *f;
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int r;
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u32 id = skb->mark;
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if (head != NULL) {
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id &= head->mask;
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for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
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f = rcu_dereference_bh(f->next)) {
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if (f->id == id) {
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*res = f->res;
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#ifdef CONFIG_NET_CLS_IND
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if (!tcf_match_indev(skb, f->ifindex))
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continue;
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#endif /* CONFIG_NET_CLS_IND */
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r = tcf_exts_exec(skb, &f->exts, res);
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if (r < 0)
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continue;
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return r;
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}
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}
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} else {
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struct Qdisc *q = tcf_block_q(tp->chain->block);
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/* Old method: classify the packet using its skb mark. */
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if (id && (TC_H_MAJ(id) == 0 ||
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!(TC_H_MAJ(id ^ q->handle)))) {
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res->classid = id;
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res->class = 0;
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return 0;
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}
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}
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return -1;
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}
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static void *fw_get(struct tcf_proto *tp, u32 handle)
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{
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f;
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if (head == NULL)
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return NULL;
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f = rtnl_dereference(head->ht[fw_hash(handle)]);
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for (; f; f = rtnl_dereference(f->next)) {
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if (f->id == handle)
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return f;
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}
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return NULL;
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}
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static int fw_init(struct tcf_proto *tp)
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{
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/* We don't allocate fw_head here, because in the old method
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* we don't need it at all.
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*/
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return 0;
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}
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static void __fw_delete_filter(struct fw_filter *f)
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{
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tcf_exts_destroy(&f->exts);
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tcf_exts_put_net(&f->exts);
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kfree(f);
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}
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static void fw_delete_filter_work(struct work_struct *work)
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{
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struct fw_filter *f = container_of(to_rcu_work(work),
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struct fw_filter,
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rwork);
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rtnl_lock();
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__fw_delete_filter(f);
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rtnl_unlock();
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}
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static void fw_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
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{
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f;
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int h;
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if (head == NULL)
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return;
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for (h = 0; h < HTSIZE; h++) {
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while ((f = rtnl_dereference(head->ht[h])) != NULL) {
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RCU_INIT_POINTER(head->ht[h],
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rtnl_dereference(f->next));
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tcf_unbind_filter(tp, &f->res);
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if (tcf_exts_get_net(&f->exts))
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tcf_queue_work(&f->rwork, fw_delete_filter_work);
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else
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__fw_delete_filter(f);
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}
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}
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kfree_rcu(head, rcu);
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}
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static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
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struct netlink_ext_ack *extack)
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{
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f = arg;
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struct fw_filter __rcu **fp;
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struct fw_filter *pfp;
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int ret = -EINVAL;
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int h;
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if (head == NULL || f == NULL)
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goto out;
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fp = &head->ht[fw_hash(f->id)];
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for (pfp = rtnl_dereference(*fp); pfp;
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fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
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if (pfp == f) {
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RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
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tcf_unbind_filter(tp, &f->res);
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tcf_exts_get_net(&f->exts);
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tcf_queue_work(&f->rwork, fw_delete_filter_work);
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ret = 0;
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break;
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}
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}
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*last = true;
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for (h = 0; h < HTSIZE; h++) {
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if (rcu_access_pointer(head->ht[h])) {
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*last = false;
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break;
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}
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}
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out:
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return ret;
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}
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static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
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[TCA_FW_CLASSID] = { .type = NLA_U32 },
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[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
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[TCA_FW_MASK] = { .type = NLA_U32 },
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};
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static int fw_set_parms(struct net *net, struct tcf_proto *tp,
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struct fw_filter *f, struct nlattr **tb,
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struct nlattr **tca, unsigned long base, bool ovr,
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struct netlink_ext_ack *extack)
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{
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struct fw_head *head = rtnl_dereference(tp->root);
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u32 mask;
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int err;
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err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
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extack);
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if (err < 0)
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return err;
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if (tb[TCA_FW_CLASSID]) {
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f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
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tcf_bind_filter(tp, &f->res, base);
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}
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#ifdef CONFIG_NET_CLS_IND
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if (tb[TCA_FW_INDEV]) {
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int ret;
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ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
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if (ret < 0)
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return ret;
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f->ifindex = ret;
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}
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#endif /* CONFIG_NET_CLS_IND */
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err = -EINVAL;
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if (tb[TCA_FW_MASK]) {
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mask = nla_get_u32(tb[TCA_FW_MASK]);
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if (mask != head->mask)
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return err;
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} else if (head->mask != 0xFFFFFFFF)
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return err;
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return 0;
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}
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static int fw_change(struct net *net, struct sk_buff *in_skb,
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struct tcf_proto *tp, unsigned long base,
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u32 handle, struct nlattr **tca, void **arg,
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bool ovr, struct netlink_ext_ack *extack)
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{
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f = *arg;
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struct nlattr *opt = tca[TCA_OPTIONS];
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struct nlattr *tb[TCA_FW_MAX + 1];
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int err;
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if (!opt)
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return handle ? -EINVAL : 0; /* Succeed if it is old method. */
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err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL);
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if (err < 0)
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return err;
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if (f) {
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struct fw_filter *pfp, *fnew;
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struct fw_filter __rcu **fp;
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if (f->id != handle && handle)
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return -EINVAL;
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fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
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if (!fnew)
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return -ENOBUFS;
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fnew->id = f->id;
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fnew->res = f->res;
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#ifdef CONFIG_NET_CLS_IND
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fnew->ifindex = f->ifindex;
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#endif /* CONFIG_NET_CLS_IND */
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fnew->tp = f->tp;
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err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
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if (err < 0) {
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kfree(fnew);
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return err;
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}
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err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
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if (err < 0) {
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tcf_exts_destroy(&fnew->exts);
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kfree(fnew);
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return err;
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}
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fp = &head->ht[fw_hash(fnew->id)];
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for (pfp = rtnl_dereference(*fp); pfp;
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fp = &pfp->next, pfp = rtnl_dereference(*fp))
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if (pfp == f)
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break;
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RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
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rcu_assign_pointer(*fp, fnew);
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tcf_unbind_filter(tp, &f->res);
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tcf_exts_get_net(&f->exts);
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tcf_queue_work(&f->rwork, fw_delete_filter_work);
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*arg = fnew;
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return err;
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}
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if (!handle)
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return -EINVAL;
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if (!head) {
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u32 mask = 0xFFFFFFFF;
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if (tb[TCA_FW_MASK])
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mask = nla_get_u32(tb[TCA_FW_MASK]);
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head = kzalloc(sizeof(*head), GFP_KERNEL);
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if (!head)
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return -ENOBUFS;
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head->mask = mask;
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rcu_assign_pointer(tp->root, head);
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}
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f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
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if (f == NULL)
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return -ENOBUFS;
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err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
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if (err < 0)
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goto errout;
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f->id = handle;
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f->tp = tp;
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err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
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if (err < 0)
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goto errout;
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RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
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rcu_assign_pointer(head->ht[fw_hash(handle)], f);
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*arg = f;
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return 0;
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errout:
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tcf_exts_destroy(&f->exts);
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kfree(f);
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return err;
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}
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static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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{
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struct fw_head *head = rtnl_dereference(tp->root);
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int h;
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if (head == NULL)
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arg->stop = 1;
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if (arg->stop)
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return;
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for (h = 0; h < HTSIZE; h++) {
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struct fw_filter *f;
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for (f = rtnl_dereference(head->ht[h]); f;
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f = rtnl_dereference(f->next)) {
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if (arg->count < arg->skip) {
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arg->count++;
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continue;
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}
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if (arg->fn(tp, f, arg) < 0) {
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arg->stop = 1;
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return;
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}
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arg->count++;
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}
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}
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}
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static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh,
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struct sk_buff *skb, struct tcmsg *t)
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{
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struct fw_head *head = rtnl_dereference(tp->root);
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struct fw_filter *f = fh;
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struct nlattr *nest;
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if (f == NULL)
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return skb->len;
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t->tcm_handle = f->id;
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if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
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return skb->len;
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nest = nla_nest_start(skb, TCA_OPTIONS);
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if (nest == NULL)
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goto nla_put_failure;
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if (f->res.classid &&
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nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
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goto nla_put_failure;
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#ifdef CONFIG_NET_CLS_IND
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if (f->ifindex) {
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struct net_device *dev;
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dev = __dev_get_by_index(net, f->ifindex);
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if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
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goto nla_put_failure;
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}
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#endif /* CONFIG_NET_CLS_IND */
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if (head->mask != 0xFFFFFFFF &&
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nla_put_u32(skb, TCA_FW_MASK, head->mask))
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goto nla_put_failure;
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if (tcf_exts_dump(skb, &f->exts) < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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if (tcf_exts_dump_stats(skb, &f->exts) < 0)
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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return -1;
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}
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static void fw_bind_class(void *fh, u32 classid, unsigned long cl)
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{
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struct fw_filter *f = fh;
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if (f && f->res.classid == classid)
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f->res.class = cl;
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}
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static struct tcf_proto_ops cls_fw_ops __read_mostly = {
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.kind = "fw",
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.classify = fw_classify,
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.init = fw_init,
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.destroy = fw_destroy,
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.get = fw_get,
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.change = fw_change,
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.delete = fw_delete,
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.walk = fw_walk,
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.dump = fw_dump,
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.bind_class = fw_bind_class,
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.owner = THIS_MODULE,
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};
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static int __init init_fw(void)
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{
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return register_tcf_proto_ops(&cls_fw_ops);
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}
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static void __exit exit_fw(void)
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{
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unregister_tcf_proto_ops(&cls_fw_ops);
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}
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module_init(init_fw)
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module_exit(exit_fw)
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MODULE_LICENSE("GPL");
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