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-rw-r--r--net/sched/cls_tcindex.c738
1 files changed, 0 insertions, 738 deletions
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
deleted file mode 100644
index 684187a1fdb9..000000000000
--- a/net/sched/cls_tcindex.c
+++ /dev/null
@@ -1,738 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * net/sched/cls_tcindex.c Packet classifier for skb->tc_index
- *
- * Written 1998,1999 by Werner Almesberger, EPFL ICA
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/skbuff.h>
-#include <linux/errno.h>
-#include <linux/slab.h>
-#include <linux/refcount.h>
-#include <net/act_api.h>
-#include <net/netlink.h>
-#include <net/pkt_cls.h>
-#include <net/sch_generic.h>
-
-/*
- * Passing parameters to the root seems to be done more awkwardly than really
- * necessary. At least, u32 doesn't seem to use such dirty hacks. To be
- * verified. FIXME.
- */
-
-#define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */
-#define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */
-
-
-struct tcindex_data;
-
-struct tcindex_filter_result {
- struct tcf_exts exts;
- struct tcf_result res;
- struct tcindex_data *p;
- struct rcu_work rwork;
-};
-
-struct tcindex_filter {
- u16 key;
- struct tcindex_filter_result result;
- struct tcindex_filter __rcu *next;
- struct rcu_work rwork;
-};
-
-
-struct tcindex_data {
- struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
- struct tcindex_filter __rcu **h; /* imperfect hash; */
- struct tcf_proto *tp;
- u16 mask; /* AND key with mask */
- u32 shift; /* shift ANDed key to the right */
- u32 hash; /* hash table size; 0 if undefined */
- u32 alloc_hash; /* allocated size */
- u32 fall_through; /* 0: only classify if explicit match */
- refcount_t refcnt; /* a temporary refcnt for perfect hash */
- struct rcu_work rwork;
-};
-
-static inline int tcindex_filter_is_set(struct tcindex_filter_result *r)
-{
- return tcf_exts_has_actions(&r->exts) || r->res.classid;
-}
-
-static void tcindex_data_get(struct tcindex_data *p)
-{
- refcount_inc(&p->refcnt);
-}
-
-static void tcindex_data_put(struct tcindex_data *p)
-{
- if (refcount_dec_and_test(&p->refcnt)) {
- kfree(p->perfect);
- kfree(p->h);
- kfree(p);
- }
-}
-
-static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p,
- u16 key)
-{
- if (p->perfect) {
- struct tcindex_filter_result *f = p->perfect + key;
-
- return tcindex_filter_is_set(f) ? f : NULL;
- } else if (p->h) {
- struct tcindex_filter __rcu **fp;
- struct tcindex_filter *f;
-
- fp = &p->h[key % p->hash];
- for (f = rcu_dereference_bh_rtnl(*fp);
- f;
- fp = &f->next, f = rcu_dereference_bh_rtnl(*fp))
- if (f->key == key)
- return &f->result;
- }
-
- return NULL;
-}
-
-
-static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp,
- struct tcf_result *res)
-{
- struct tcindex_data *p = rcu_dereference_bh(tp->root);
- struct tcindex_filter_result *f;
- int key = (skb->tc_index & p->mask) >> p->shift;
-
- pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n",
- skb, tp, res, p);
-
- f = tcindex_lookup(p, key);
- if (!f) {
- struct Qdisc *q = tcf_block_q(tp->chain->block);
-
- if (!p->fall_through)
- return -1;
- res->classid = TC_H_MAKE(TC_H_MAJ(q->handle), key);
- res->class = 0;
- pr_debug("alg 0x%x\n", res->classid);
- return 0;
- }
- *res = f->res;
- pr_debug("map 0x%x\n", res->classid);
-
- return tcf_exts_exec(skb, &f->exts, res);
-}
-
-
-static void *tcindex_get(struct tcf_proto *tp, u32 handle)
-{
- struct tcindex_data *p = rtnl_dereference(tp->root);
- struct tcindex_filter_result *r;
-
- pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle);
- if (p->perfect && handle >= p->alloc_hash)
- return NULL;
- r = tcindex_lookup(p, handle);
- return r && tcindex_filter_is_set(r) ? r : NULL;
-}
-
-static int tcindex_init(struct tcf_proto *tp)
-{
- struct tcindex_data *p;
-
- pr_debug("tcindex_init(tp %p)\n", tp);
- p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
-
- p->mask = 0xffff;
- p->hash = DEFAULT_HASH_SIZE;
- p->fall_through = 1;
- refcount_set(&p->refcnt, 1); /* Paired with tcindex_destroy_work() */
-
- rcu_assign_pointer(tp->root, p);
- return 0;
-}
-
-static void __tcindex_destroy_rexts(struct tcindex_filter_result *r)
-{
- tcf_exts_destroy(&r->exts);
- tcf_exts_put_net(&r->exts);
- tcindex_data_put(r->p);
-}
-
-static void tcindex_destroy_rexts_work(struct work_struct *work)
-{
- struct tcindex_filter_result *r;
-
- r = container_of(to_rcu_work(work),
- struct tcindex_filter_result,
- rwork);
- rtnl_lock();
- __tcindex_destroy_rexts(r);
- rtnl_unlock();
-}
-
-static void __tcindex_destroy_fexts(struct tcindex_filter *f)
-{
- tcf_exts_destroy(&f->result.exts);
- tcf_exts_put_net(&f->result.exts);
- kfree(f);
-}
-
-static void tcindex_destroy_fexts_work(struct work_struct *work)
-{
- struct tcindex_filter *f = container_of(to_rcu_work(work),
- struct tcindex_filter,
- rwork);
-
- rtnl_lock();
- __tcindex_destroy_fexts(f);
- rtnl_unlock();
-}
-
-static int tcindex_delete(struct tcf_proto *tp, void *arg, bool *last,
- bool rtnl_held, struct netlink_ext_ack *extack)
-{
- struct tcindex_data *p = rtnl_dereference(tp->root);
- struct tcindex_filter_result *r = arg;
- struct tcindex_filter __rcu **walk;
- struct tcindex_filter *f = NULL;
-
- pr_debug("tcindex_delete(tp %p,arg %p),p %p\n", tp, arg, p);
- if (p->perfect) {
- if (!r->res.class)
- return -ENOENT;
- } else {
- int i;
-
- for (i = 0; i < p->hash; i++) {
- walk = p->h + i;
- for (f = rtnl_dereference(*walk); f;
- walk = &f->next, f = rtnl_dereference(*walk)) {
- if (&f->result == r)
- goto found;
- }
- }
- return -ENOENT;
-
-found:
- rcu_assign_pointer(*walk, rtnl_dereference(f->next));
- }
- tcf_unbind_filter(tp, &r->res);
- /* all classifiers are required to call tcf_exts_destroy() after rcu
- * grace period, since converted-to-rcu actions are relying on that
- * in cleanup() callback
- */
- if (f) {
- if (tcf_exts_get_net(&f->result.exts))
- tcf_queue_work(&f->rwork, tcindex_destroy_fexts_work);
- else
- __tcindex_destroy_fexts(f);
- } else {
- tcindex_data_get(p);
-
- if (tcf_exts_get_net(&r->exts))
- tcf_queue_work(&r->rwork, tcindex_destroy_rexts_work);
- else
- __tcindex_destroy_rexts(r);
- }
-
- *last = false;
- return 0;
-}
-
-static void tcindex_destroy_work(struct work_struct *work)
-{
- struct tcindex_data *p = container_of(to_rcu_work(work),
- struct tcindex_data,
- rwork);
-
- tcindex_data_put(p);
-}
-
-static inline int
-valid_perfect_hash(struct tcindex_data *p)
-{
- return p->hash > (p->mask >> p->shift);
-}
-
-static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
- [TCA_TCINDEX_HASH] = { .type = NLA_U32 },
- [TCA_TCINDEX_MASK] = { .type = NLA_U16 },
- [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 },
- [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 },
- [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 },
-};
-
-static int tcindex_filter_result_init(struct tcindex_filter_result *r,
- struct tcindex_data *p,
- struct net *net)
-{
- memset(r, 0, sizeof(*r));
- r->p = p;
- return tcf_exts_init(&r->exts, net, TCA_TCINDEX_ACT,
- TCA_TCINDEX_POLICE);
-}
-
-static void tcindex_free_perfect_hash(struct tcindex_data *cp);
-
-static void tcindex_partial_destroy_work(struct work_struct *work)
-{
- struct tcindex_data *p = container_of(to_rcu_work(work),
- struct tcindex_data,
- rwork);
-
- rtnl_lock();
- if (p->perfect)
- tcindex_free_perfect_hash(p);
- kfree(p);
- rtnl_unlock();
-}
-
-static void tcindex_free_perfect_hash(struct tcindex_data *cp)
-{
- int i;
-
- for (i = 0; i < cp->hash; i++)
- tcf_exts_destroy(&cp->perfect[i].exts);
- kfree(cp->perfect);
-}
-
-static int tcindex_alloc_perfect_hash(struct net *net, struct tcindex_data *cp)
-{
- int i, err = 0;
-
- cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result),
- GFP_KERNEL | __GFP_NOWARN);
- if (!cp->perfect)
- return -ENOMEM;
-
- for (i = 0; i < cp->hash; i++) {
- err = tcf_exts_init(&cp->perfect[i].exts, net,
- TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
- if (err < 0)
- goto errout;
- cp->perfect[i].p = cp;
- }
-
- return 0;
-
-errout:
- tcindex_free_perfect_hash(cp);
- return err;
-}
-
-static int
-tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
- u32 handle, struct tcindex_data *p,
- struct tcindex_filter_result *r, struct nlattr **tb,
- struct nlattr *est, bool ovr, struct netlink_ext_ack *extack)
-{
- struct tcindex_filter_result new_filter_result, *old_r = r;
- struct tcindex_data *cp = NULL, *oldp;
- struct tcindex_filter *f = NULL; /* make gcc behave */
- struct tcf_result cr = {};
- int err, balloc = 0;
- struct tcf_exts e;
-
- err = tcf_exts_init(&e, net, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
- if (err < 0)
- return err;
- err = tcf_exts_validate(net, tp, tb, est, &e, ovr, true, extack);
- if (err < 0)
- goto errout;
-
- err = -ENOMEM;
- /* tcindex_data attributes must look atomic to classifier/lookup so
- * allocate new tcindex data and RCU assign it onto root. Keeping
- * perfect hash and hash pointers from old data.
- */
- cp = kzalloc(sizeof(*cp), GFP_KERNEL);
- if (!cp)
- goto errout;
-
- cp->mask = p->mask;
- cp->shift = p->shift;
- cp->hash = p->hash;
- cp->alloc_hash = p->alloc_hash;
- cp->fall_through = p->fall_through;
- cp->tp = tp;
- refcount_set(&cp->refcnt, 1); /* Paired with tcindex_destroy_work() */
-
- if (tb[TCA_TCINDEX_HASH])
- cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
-
- if (tb[TCA_TCINDEX_MASK])
- cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);
-
- if (tb[TCA_TCINDEX_SHIFT]) {
- cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);
- if (cp->shift > 16) {
- err = -EINVAL;
- goto errout;
- }
- }
- if (!cp->hash) {
- /* Hash not specified, use perfect hash if the upper limit
- * of the hashing index is below the threshold.
- */
- if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD)
- cp->hash = (cp->mask >> cp->shift) + 1;
- else
- cp->hash = DEFAULT_HASH_SIZE;
- }
-
- if (p->perfect) {
- int i;
-
- if (tcindex_alloc_perfect_hash(net, cp) < 0)
- goto errout;
- cp->alloc_hash = cp->hash;
- for (i = 0; i < min(cp->hash, p->hash); i++)
- cp->perfect[i].res = p->perfect[i].res;
- balloc = 1;
- }
- cp->h = p->h;
-
- err = tcindex_filter_result_init(&new_filter_result, cp, net);
- if (err < 0)
- goto errout_alloc;
- if (old_r)
- cr = r->res;
-
- err = -EBUSY;
-
- /* Hash already allocated, make sure that we still meet the
- * requirements for the allocated hash.
- */
- if (cp->perfect) {
- if (!valid_perfect_hash(cp) ||
- cp->hash > cp->alloc_hash)
- goto errout_alloc;
- } else if (cp->h && cp->hash != cp->alloc_hash) {
- goto errout_alloc;
- }
-
- err = -EINVAL;
- if (tb[TCA_TCINDEX_FALL_THROUGH])
- cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
-
- if (!cp->perfect && !cp->h)
- cp->alloc_hash = cp->hash;
-
- /* Note: this could be as restrictive as if (handle & ~(mask >> shift))
- * but then, we'd fail handles that may become valid after some future
- * mask change. While this is extremely unlikely to ever matter,
- * the check below is safer (and also more backwards-compatible).
- */
- if (cp->perfect || valid_perfect_hash(cp))
- if (handle >= cp->alloc_hash)
- goto errout_alloc;
-
-
- err = -ENOMEM;
- if (!cp->perfect && !cp->h) {
- if (valid_perfect_hash(cp)) {
- if (tcindex_alloc_perfect_hash(net, cp) < 0)
- goto errout_alloc;
- balloc = 1;
- } else {
- struct tcindex_filter __rcu **hash;
-
- hash = kcalloc(cp->hash,
- sizeof(struct tcindex_filter *),
- GFP_KERNEL);
-
- if (!hash)
- goto errout_alloc;
-
- cp->h = hash;
- balloc = 2;
- }
- }
-
- if (cp->perfect)
- r = cp->perfect + handle;
- else
- r = tcindex_lookup(cp, handle) ? : &new_filter_result;
-
- if (r == &new_filter_result) {
- f = kzalloc(sizeof(*f), GFP_KERNEL);
- if (!f)
- goto errout_alloc;
- f->key = handle;
- f->next = NULL;
- err = tcindex_filter_result_init(&f->result, cp, net);
- if (err < 0) {
- kfree(f);
- goto errout_alloc;
- }
- }
-
- if (tb[TCA_TCINDEX_CLASSID]) {
- cr.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
- tcf_bind_filter(tp, &cr, base);
- }
-
- if (old_r && old_r != r) {
- err = tcindex_filter_result_init(old_r, cp, net);
- if (err < 0) {
- kfree(f);
- goto errout_alloc;
- }
- }
-
- oldp = p;
- r->res = cr;
- tcf_exts_change(&r->exts, &e);
-
- rcu_assign_pointer(tp->root, cp);
-
- if (r == &new_filter_result) {
- struct tcindex_filter *nfp;
- struct tcindex_filter __rcu **fp;
-
- f->result.res = r->res;
- tcf_exts_change(&f->result.exts, &r->exts);
-
- fp = cp->h + (handle % cp->hash);
- for (nfp = rtnl_dereference(*fp);
- nfp;
- 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");