![Cong Wang](/assets/img/avatar_default.png)
The initial refcnt of struct tcindex_data should be 1,
it is clear that I forgot to set it to 1 in tcindex_init().
This leads to a dec-after-zero warning.
Reported-by: syzbot+8325e509a1bf83ec741d@syzkaller.appspotmail.com
Fixes: 304e024216
("net_sched: add a temporary refcnt for struct tcindex_data")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
732 lines
17 KiB
C
732 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* net/sched/cls_tcindex.c Packet classifier for skb->tc_index
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*
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* Written 1998,1999 by Werner Almesberger, EPFL ICA
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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/skbuff.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/refcount.h>
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#include <net/act_api.h>
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#include <net/netlink.h>
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#include <net/pkt_cls.h>
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#include <net/sch_generic.h>
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/*
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* Passing parameters to the root seems to be done more awkwardly than really
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* necessary. At least, u32 doesn't seem to use such dirty hacks. To be
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* verified. FIXME.
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*/
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#define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */
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#define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */
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struct tcindex_data;
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struct tcindex_filter_result {
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struct tcf_exts exts;
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struct tcf_result res;
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struct tcindex_data *p;
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struct rcu_work rwork;
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};
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struct tcindex_filter {
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u16 key;
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struct tcindex_filter_result result;
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struct tcindex_filter __rcu *next;
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struct rcu_work rwork;
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};
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struct tcindex_data {
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struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
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struct tcindex_filter __rcu **h; /* imperfect hash; */
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struct tcf_proto *tp;
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u16 mask; /* AND key with mask */
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u32 shift; /* shift ANDed key to the right */
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u32 hash; /* hash table size; 0 if undefined */
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u32 alloc_hash; /* allocated size */
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u32 fall_through; /* 0: only classify if explicit match */
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refcount_t refcnt; /* a temporary refcnt for perfect hash */
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struct rcu_work rwork;
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};
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static inline int tcindex_filter_is_set(struct tcindex_filter_result *r)
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{
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return tcf_exts_has_actions(&r->exts) || r->res.classid;
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}
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static void tcindex_data_get(struct tcindex_data *p)
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{
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refcount_inc(&p->refcnt);
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}
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static void tcindex_data_put(struct tcindex_data *p)
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{
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if (refcount_dec_and_test(&p->refcnt)) {
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kfree(p->perfect);
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kfree(p->h);
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kfree(p);
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}
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}
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static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p,
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u16 key)
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{
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if (p->perfect) {
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struct tcindex_filter_result *f = p->perfect + key;
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return tcindex_filter_is_set(f) ? f : NULL;
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} else if (p->h) {
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struct tcindex_filter __rcu **fp;
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struct tcindex_filter *f;
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fp = &p->h[key % p->hash];
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for (f = rcu_dereference_bh_rtnl(*fp);
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f;
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fp = &f->next, f = rcu_dereference_bh_rtnl(*fp))
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if (f->key == key)
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return &f->result;
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}
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return NULL;
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}
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static int tcindex_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 tcindex_data *p = rcu_dereference_bh(tp->root);
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struct tcindex_filter_result *f;
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int key = (skb->tc_index & p->mask) >> p->shift;
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pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n",
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skb, tp, res, p);
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f = tcindex_lookup(p, key);
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if (!f) {
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struct Qdisc *q = tcf_block_q(tp->chain->block);
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if (!p->fall_through)
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return -1;
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res->classid = TC_H_MAKE(TC_H_MAJ(q->handle), key);
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res->class = 0;
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pr_debug("alg 0x%x\n", res->classid);
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return 0;
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}
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*res = f->res;
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pr_debug("map 0x%x\n", res->classid);
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return tcf_exts_exec(skb, &f->exts, res);
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}
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static void *tcindex_get(struct tcf_proto *tp, u32 handle)
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{
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struct tcindex_data *p = rtnl_dereference(tp->root);
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struct tcindex_filter_result *r;
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pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle);
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if (p->perfect && handle >= p->alloc_hash)
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return NULL;
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r = tcindex_lookup(p, handle);
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return r && tcindex_filter_is_set(r) ? r : NULL;
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}
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static int tcindex_init(struct tcf_proto *tp)
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{
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struct tcindex_data *p;
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pr_debug("tcindex_init(tp %p)\n", tp);
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p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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p->mask = 0xffff;
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p->hash = DEFAULT_HASH_SIZE;
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p->fall_through = 1;
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refcount_set(&p->refcnt, 1); /* Paired with tcindex_destroy_work() */
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rcu_assign_pointer(tp->root, p);
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return 0;
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}
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static void __tcindex_destroy_rexts(struct tcindex_filter_result *r)
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{
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tcf_exts_destroy(&r->exts);
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tcf_exts_put_net(&r->exts);
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tcindex_data_put(r->p);
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}
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static void tcindex_destroy_rexts_work(struct work_struct *work)
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{
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struct tcindex_filter_result *r;
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r = container_of(to_rcu_work(work),
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struct tcindex_filter_result,
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rwork);
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rtnl_lock();
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__tcindex_destroy_rexts(r);
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rtnl_unlock();
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}
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static void __tcindex_destroy_fexts(struct tcindex_filter *f)
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{
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tcf_exts_destroy(&f->result.exts);
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tcf_exts_put_net(&f->result.exts);
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kfree(f);
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}
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static void tcindex_destroy_fexts_work(struct work_struct *work)
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{
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struct tcindex_filter *f = container_of(to_rcu_work(work),
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struct tcindex_filter,
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rwork);
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rtnl_lock();
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__tcindex_destroy_fexts(f);
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rtnl_unlock();
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}
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static int tcindex_delete(struct tcf_proto *tp, void *arg, bool *last,
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bool rtnl_held, struct netlink_ext_ack *extack)
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{
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struct tcindex_data *p = rtnl_dereference(tp->root);
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struct tcindex_filter_result *r = arg;
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struct tcindex_filter __rcu **walk;
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struct tcindex_filter *f = NULL;
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pr_debug("tcindex_delete(tp %p,arg %p),p %p\n", tp, arg, p);
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if (p->perfect) {
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if (!r->res.class)
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return -ENOENT;
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} else {
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int i;
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for (i = 0; i < p->hash; i++) {
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walk = p->h + i;
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for (f = rtnl_dereference(*walk); f;
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walk = &f->next, f = rtnl_dereference(*walk)) {
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if (&f->result == r)
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goto found;
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}
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}
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return -ENOENT;
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found:
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rcu_assign_pointer(*walk, rtnl_dereference(f->next));
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}
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tcf_unbind_filter(tp, &r->res);
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/* all classifiers are required to call tcf_exts_destroy() after rcu
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* grace period, since converted-to-rcu actions are relying on that
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* in cleanup() callback
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*/
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if (f) {
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if (tcf_exts_get_net(&f->result.exts))
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tcf_queue_work(&f->rwork, tcindex_destroy_fexts_work);
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else
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__tcindex_destroy_fexts(f);
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} else {
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tcindex_data_get(p);
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if (tcf_exts_get_net(&r->exts))
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tcf_queue_work(&r->rwork, tcindex_destroy_rexts_work);
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else
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__tcindex_destroy_rexts(r);
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}
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*last = false;
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return 0;
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}
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static void tcindex_destroy_work(struct work_struct *work)
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{
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struct tcindex_data *p = container_of(to_rcu_work(work),
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struct tcindex_data,
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rwork);
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tcindex_data_put(p);
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}
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static inline int
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valid_perfect_hash(struct tcindex_data *p)
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{
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return p->hash > (p->mask >> p->shift);
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}
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static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
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[TCA_TCINDEX_HASH] = { .type = NLA_U32 },
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[TCA_TCINDEX_MASK] = { .type = NLA_U16 },
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[TCA_TCINDEX_SHIFT] = { .type = NLA_U32 },
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[TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 },
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[TCA_TCINDEX_CLASSID] = { .type = NLA_U32 },
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};
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static int tcindex_filter_result_init(struct tcindex_filter_result *r,
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struct tcindex_data *p,
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struct net *net)
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{
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memset(r, 0, sizeof(*r));
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r->p = p;
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return tcf_exts_init(&r->exts, net, TCA_TCINDEX_ACT,
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TCA_TCINDEX_POLICE);
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}
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static void tcindex_partial_destroy_work(struct work_struct *work)
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{
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struct tcindex_data *p = container_of(to_rcu_work(work),
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struct tcindex_data,
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rwork);
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rtnl_lock();
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kfree(p->perfect);
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kfree(p);
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rtnl_unlock();
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}
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static void tcindex_free_perfect_hash(struct tcindex_data *cp)
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{
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int i;
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for (i = 0; i < cp->hash; i++)
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tcf_exts_destroy(&cp->perfect[i].exts);
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kfree(cp->perfect);
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}
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static int tcindex_alloc_perfect_hash(struct net *net, struct tcindex_data *cp)
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{
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int i, err = 0;
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cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result),
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GFP_KERNEL);
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if (!cp->perfect)
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return -ENOMEM;
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for (i = 0; i < cp->hash; i++) {
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err = tcf_exts_init(&cp->perfect[i].exts, net,
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TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
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if (err < 0)
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goto errout;
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cp->perfect[i].p = cp;
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}
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return 0;
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errout:
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tcindex_free_perfect_hash(cp);
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return err;
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}
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static int
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tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
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u32 handle, struct tcindex_data *p,
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struct tcindex_filter_result *r, struct nlattr **tb,
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struct nlattr *est, bool ovr, struct netlink_ext_ack *extack)
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{
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struct tcindex_filter_result new_filter_result, *old_r = r;
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struct tcindex_data *cp = NULL, *oldp;
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struct tcindex_filter *f = NULL; /* make gcc behave */
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struct tcf_result cr = {};
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int err, balloc = 0;
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struct tcf_exts e;
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err = tcf_exts_init(&e, net, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
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if (err < 0)
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return err;
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err = tcf_exts_validate(net, tp, tb, est, &e, ovr, true, extack);
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if (err < 0)
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goto errout;
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err = -ENOMEM;
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/* tcindex_data attributes must look atomic to classifier/lookup so
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* allocate new tcindex data and RCU assign it onto root. Keeping
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* perfect hash and hash pointers from old data.
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*/
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cp = kzalloc(sizeof(*cp), GFP_KERNEL);
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if (!cp)
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goto errout;
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cp->mask = p->mask;
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cp->shift = p->shift;
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cp->hash = p->hash;
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cp->alloc_hash = p->alloc_hash;
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cp->fall_through = p->fall_through;
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cp->tp = tp;
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refcount_set(&cp->refcnt, 1); /* Paired with tcindex_destroy_work() */
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if (tb[TCA_TCINDEX_HASH])
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cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
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if (tb[TCA_TCINDEX_MASK])
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cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);
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if (tb[TCA_TCINDEX_SHIFT])
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cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);
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if (!cp->hash) {
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/* Hash not specified, use perfect hash if the upper limit
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* of the hashing index is below the threshold.
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*/
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if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD)
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cp->hash = (cp->mask >> cp->shift) + 1;
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else
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cp->hash = DEFAULT_HASH_SIZE;
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}
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if (p->perfect) {
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int i;
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if (tcindex_alloc_perfect_hash(net, cp) < 0)
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goto errout;
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cp->alloc_hash = cp->hash;
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for (i = 0; i < min(cp->hash, p->hash); i++)
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cp->perfect[i].res = p->perfect[i].res;
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balloc = 1;
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}
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cp->h = p->h;
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err = tcindex_filter_result_init(&new_filter_result, cp, net);
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if (err < 0)
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goto errout_alloc;
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if (old_r)
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cr = r->res;
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err = -EBUSY;
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/* Hash already allocated, make sure that we still meet the
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* requirements for the allocated hash.
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*/
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if (cp->perfect) {
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if (!valid_perfect_hash(cp) ||
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cp->hash > cp->alloc_hash)
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goto errout_alloc;
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} else if (cp->h && cp->hash != cp->alloc_hash) {
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goto errout_alloc;
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}
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err = -EINVAL;
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if (tb[TCA_TCINDEX_FALL_THROUGH])
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cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
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if (!cp->perfect && !cp->h)
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cp->alloc_hash = cp->hash;
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/* Note: this could be as restrictive as if (handle & ~(mask >> shift))
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* but then, we'd fail handles that may become valid after some future
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* mask change. While this is extremely unlikely to ever matter,
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* the check below is safer (and also more backwards-compatible).
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*/
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if (cp->perfect || valid_perfect_hash(cp))
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if (handle >= cp->alloc_hash)
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goto errout_alloc;
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err = -ENOMEM;
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if (!cp->perfect && !cp->h) {
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if (valid_perfect_hash(cp)) {
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if (tcindex_alloc_perfect_hash(net, cp) < 0)
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goto errout_alloc;
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balloc = 1;
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} else {
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struct tcindex_filter __rcu **hash;
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hash = kcalloc(cp->hash,
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sizeof(struct tcindex_filter *),
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GFP_KERNEL);
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if (!hash)
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goto errout_alloc;
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cp->h = hash;
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balloc = 2;
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}
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}
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if (cp->perfect)
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r = cp->perfect + handle;
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else
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r = tcindex_lookup(cp, handle) ? : &new_filter_result;
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if (r == &new_filter_result) {
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f = kzalloc(sizeof(*f), GFP_KERNEL);
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if (!f)
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goto errout_alloc;
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f->key = handle;
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f->next = NULL;
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err = tcindex_filter_result_init(&f->result, cp, net);
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if (err < 0) {
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kfree(f);
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goto errout_alloc;
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}
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}
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if (tb[TCA_TCINDEX_CLASSID]) {
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cr.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
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tcf_bind_filter(tp, &cr, base);
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}
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if (old_r && old_r != r) {
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err = tcindex_filter_result_init(old_r, cp, net);
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if (err < 0) {
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kfree(f);
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goto errout_alloc;
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}
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}
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oldp = p;
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r->res = cr;
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tcf_exts_change(&r->exts, &e);
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rcu_assign_pointer(tp->root, cp);
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if (r == &new_filter_result) {
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struct tcindex_filter *nfp;
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struct tcindex_filter __rcu **fp;
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f->result.res = r->res;
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tcf_exts_change(&f->result.exts, &r->exts);
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fp = cp->h + (handle % cp->hash);
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for (nfp = rtnl_dereference(*fp);
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nfp;
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fp = &nfp->next, nfp = rtnl_dereference(*fp))
|
|
; /* nothing */
|
|
|
|
rcu_assign_pointer(*fp, f);
|
|
} else {
|
|
tcf_exts_destroy(&new_filter_result.exts);
|
|
}
|
|
|
|
if (oldp)
|
|
tcf_queue_work(&oldp->rwork, tcindex_partial_destroy_work);
|
|
return 0;
|
|
|
|
errout_alloc:
|
|
if (balloc == 1)
|
|
tcindex_free_perfect_hash(cp);
|
|
else if (balloc == 2)
|
|
kfree(cp->h);
|
|
tcf_exts_destroy(&new_filter_result.exts);
|
|
errout:
|
|
kfree(cp);
|
|
tcf_exts_destroy(&e);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
tcindex_change(struct net *net, struct sk_buff *in_skb,
|
|
struct tcf_proto *tp, unsigned long base, u32 handle,
|
|
struct nlattr **tca, void **arg, bool ovr,
|
|
bool rtnl_held, struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *opt = tca[TCA_OPTIONS];
|
|
struct nlattr *tb[TCA_TCINDEX_MAX + 1];
|
|
struct tcindex_data *p = rtnl_dereference(tp->root);
|
|
struct tcindex_filter_result *r = *arg;
|
|
int err;
|
|
|
|
pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
|
|
"p %p,r %p,*arg %p\n",
|
|
tp, handle, tca, arg, opt, p, r, arg ? *arg : NULL);
|
|
|
|
if (!opt)
|
|
return 0;
|
|
|
|
err = nla_parse_nested_deprecated(tb, TCA_TCINDEX_MAX, opt,
|
|
tcindex_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return tcindex_set_parms(net, tp, base, handle, p, r, tb,
|
|
tca[TCA_RATE], ovr, extack);
|
|
}
|
|
|
|
static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker,
|
|
bool rtnl_held)
|
|
{
|
|
struct tcindex_data *p = rtnl_dereference(tp->root);
|
|
struct tcindex_filter *f, *next;
|
|
int i;
|
|
|
|
pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p);
|
|
if (p->perfect) {
|
|
for (i = 0; i < p->hash; i++) {
|
|
if (!p->perfect[i].res.class)
|
|
continue;
|
|
if (walker->count >= walker->skip) {
|
|
if (walker->fn(tp, p->perfect + i, walker) < 0) {
|
|
walker->stop = 1;
|
|
return;
|
|
}
|
|
}
|
|
walker->count++;
|
|
}
|
|
}
|
|
if (!p->h)
|
|
return;
|
|
for (i = 0; i < p->hash; i++) {
|
|
for (f = rtnl_dereference(p->h[i]); f; f = next) {
|
|
next = rtnl_dereference(f->next);
|
|
if (walker->count >= walker->skip) {
|
|
if (walker->fn(tp, &f->result, walker) < 0) {
|
|
walker->stop = 1;
|
|
return;
|
|
}
|
|
}
|
|
walker->count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void tcindex_destroy(struct tcf_proto *tp, bool rtnl_held,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tcindex_data *p = rtnl_dereference(tp->root);
|
|
int i;
|
|
|
|
pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
|
|
|
|
if (p->perfect) {
|
|
for (i = 0; i < p->hash; i++) {
|
|
struct tcindex_filter_result *r = p->perfect + i;
|
|
|
|
/* tcf_queue_work() does not guarantee the ordering we
|
|
* want, so we have to take this refcnt temporarily to
|
|
* ensure 'p' is freed after all tcindex_filter_result
|
|
* here. Imperfect hash does not need this, because it
|
|
* uses linked lists rather than an array.
|
|
*/
|
|
tcindex_data_get(p);
|
|
|
|
tcf_unbind_filter(tp, &r->res);
|
|
if (tcf_exts_get_net(&r->exts))
|
|
tcf_queue_work(&r->rwork,
|
|
tcindex_destroy_rexts_work);
|
|
else
|
|
__tcindex_destroy_rexts(r);
|
|
}
|
|
}
|
|
|
|
for (i = 0; p->h && i < p->hash; i++) {
|
|
struct tcindex_filter *f, *next;
|
|
bool last;
|
|
|
|
for (f = rtnl_dereference(p->h[i]); f; f = next) {
|
|
next = rtnl_dereference(f->next);
|
|
tcindex_delete(tp, &f->result, &last, rtnl_held, NULL);
|
|
}
|
|
}
|
|
|
|
tcf_queue_work(&p->rwork, tcindex_destroy_work);
|
|
}
|
|
|
|
|
|
static int tcindex_dump(struct net *net, struct tcf_proto *tp, void *fh,
|
|
struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
|
|
{
|
|
struct tcindex_data *p = rtnl_dereference(tp->root);
|
|
struct tcindex_filter_result *r = fh;
|
|
struct nlattr *nest;
|
|
|
|
pr_debug("tcindex_dump(tp %p,fh %p,skb %p,t %p),p %p,r %p\n",
|
|
tp, fh, skb, t, p, r);
|
|
pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
|
|
|
|
nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (!fh) {
|
|
t->tcm_handle = ~0; /* whatever ... */
|
|
if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) ||
|
|
nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) ||
|
|
nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) ||
|
|
nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through))
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
} else {
|
|
if (p->perfect) {
|
|
t->tcm_handle = r - p->perfect;
|
|
} else {
|
|
struct tcindex_filter *f;
|
|
struct tcindex_filter __rcu **fp;
|
|
int i;
|
|
|
|
t->tcm_handle = 0;
|
|
for (i = 0; !t->tcm_handle && i < p->hash; i++) {
|
|
fp = &p->h[i];
|
|
for (f = rtnl_dereference(*fp);
|
|
!t->tcm_handle && f;
|
|
fp = &f->next, f = rtnl_dereference(*fp)) {
|
|
if (&f->result == r)
|
|
t->tcm_handle = f->key;
|
|
}
|
|
}
|
|
}
|
|
pr_debug("handle = %d\n", t->tcm_handle);
|
|
if (r->res.class &&
|
|
nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid))
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &r->exts) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &r->exts) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static void tcindex_bind_class(void *fh, u32 classid, unsigned long cl,
|
|
void *q, unsigned long base)
|
|
{
|
|
struct tcindex_filter_result *r = fh;
|
|
|
|
if (r && r->res.classid == classid) {
|
|
if (cl)
|
|
__tcf_bind_filter(q, &r->res, base);
|
|
else
|
|
__tcf_unbind_filter(q, &r->res);
|
|
}
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
|
|
.kind = "tcindex",
|
|
.classify = tcindex_classify,
|
|
.init = tcindex_init,
|
|
.destroy = tcindex_destroy,
|
|
.get = tcindex_get,
|
|
.change = tcindex_change,
|
|
.delete = tcindex_delete,
|
|
.walk = tcindex_walk,
|
|
.dump = tcindex_dump,
|
|
.bind_class = tcindex_bind_class,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init init_tcindex(void)
|
|
{
|
|
return register_tcf_proto_ops(&cls_tcindex_ops);
|
|
}
|
|
|
|
static void __exit exit_tcindex(void)
|
|
{
|
|
unregister_tcf_proto_ops(&cls_tcindex_ops);
|
|
}
|
|
|
|
module_init(init_tcindex)
|
|
module_exit(exit_tcindex)
|
|
MODULE_LICENSE("GPL");
|