summaryrefslogtreecommitdiff
path: root/net/sched/cls_tcindex.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sched/cls_tcindex.c')
-rw-r--r--net/sched/cls_tcindex.c512
1 files changed, 0 insertions, 512 deletions
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
deleted file mode 100644
index b86535a40169..000000000000
--- a/net/sched/cls_tcindex.c
+++ /dev/null
@@ -1,512 +0,0 @@
-/*
- * 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 <net/act_api.h>
-#include <net/netlink.h>
-#include <net/pkt_cls.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 */
-
-
-#define PRIV(tp) ((struct tcindex_data *) (tp)->root)
-
-
-struct tcindex_filter_result {
- struct tcf_exts exts;
- struct tcf_result res;
-};
-
-struct tcindex_filter {
- u16 key;
- struct tcindex_filter_result result;
- struct tcindex_filter *next;
-};
-
-
-struct tcindex_data {
- struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
- struct tcindex_filter **h; /* imperfect hash; only used if !perfect;
- NULL if unused */
- u16 mask; /* AND key with mask */
- int shift; /* shift ANDed key to the right */
- int hash; /* hash table size; 0 if undefined */
- int alloc_hash; /* allocated size */
- int fall_through; /* 0: only classify if explicit match */
-};
-
-static const struct tcf_ext_map tcindex_ext_map = {
- .police = TCA_TCINDEX_POLICE,
- .action = TCA_TCINDEX_ACT
-};
-
-static inline int
-tcindex_filter_is_set(struct tcindex_filter_result *r)
-{
- return tcf_exts_is_predicative(&r->exts) || r->res.classid;
-}
-
-static struct tcindex_filter_result *
-tcindex_lookup(struct tcindex_data *p, u16 key)
-{
- struct tcindex_filter *f;
-
- if (p->perfect)
- return tcindex_filter_is_set(p->perfect + key) ?
- p->perfect + key : NULL;
- else if (p->h) {
- for (f = p->h[key % p->hash]; f; f = f->next)
- 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 = PRIV(tp);
- 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) {
- if (!p->fall_through)
- return -1;
- res->classid = TC_H_MAKE(TC_H_MAJ(tp->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 unsigned long tcindex_get(struct tcf_proto *tp, u32 handle)
-{
- struct tcindex_data *p = PRIV(tp);
- 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 0;
- r = tcindex_lookup(p, handle);
- return r && tcindex_filter_is_set(r) ? (unsigned long) r : 0UL;
-}
-
-
-static void tcindex_put(struct tcf_proto *tp, unsigned long f)
-{
- pr_debug("tcindex_put(tp %p,f 0x%lx)\n", tp, f);
-}
-
-
-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;
-
- tp->root = p;
- return 0;
-}
-
-
-static int
-__tcindex_delete(struct tcf_proto *tp, unsigned long arg, int lock)
-{
- struct tcindex_data *p = PRIV(tp);
- struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg;
- struct tcindex_filter *f = NULL;
-
- pr_debug("tcindex_delete(tp %p,arg 0x%lx),p %p,f %p\n", tp, arg, p, f);
- if (p->perfect) {
- if (!r->res.class)
- return -ENOENT;
- } else {
- int i;
- struct tcindex_filter **walk = NULL;
-
- for (i = 0; i < p->hash; i++)
- for (walk = p->h+i; *walk; walk = &(*walk)->next)
- if (&(*walk)->result == r)
- goto found;
- return -ENOENT;
-
-found:
- f = *walk;
- if (lock)
- tcf_tree_lock(tp);
- *walk = f->next;
- if (lock)
- tcf_tree_unlock(tp);
- }
- tcf_unbind_filter(tp, &r->res);
- tcf_exts_destroy(tp, &r->exts);
- kfree(f);
- return 0;
-}
-
-static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
-{
- return __tcindex_delete(tp, arg, 1);
-}
-
-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_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)
-{
- int err, balloc = 0;
- struct tcindex_filter_result new_filter_result, *old_r = r;
- struct tcindex_filter_result cr;
- struct tcindex_data cp;
- struct tcindex_filter *f = NULL; /* make gcc behave */
- struct tcf_exts e;
-
- err = tcf_exts_validate(net, tp, tb, est, &e, &tcindex_ext_map);
- if (err < 0)
- return err;
-
- memcpy(&cp, p, sizeof(cp));
- memset(&new_filter_result, 0, sizeof(new_filter_result));
-
- if (old_r)
- memcpy(&cr, r, sizeof(cr));
- else
- memset(&cr, 0, sizeof(cr));
-
- 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]);
-
- 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;
- } else if (cp.h && cp.hash != cp.alloc_hash)
- goto errout;
-
- err = -EINVAL;
- if (tb[TCA_TCINDEX_FALL_THROUGH])
- cp.fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
-
- 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 (!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;
-
-
- err = -ENOMEM;
- if (!cp.perfect && !cp.h) {
- if (valid_perfect_hash(&cp)) {
- cp.perfect = kcalloc(cp.hash, sizeof(*r), GFP_KERNEL);
- if (!cp.perfect)
- goto errout;
- balloc = 1;
- } else {
- cp.h = kcalloc(cp.hash, sizeof(f), GFP_KERNEL);
- if (!cp.h)
- goto errout;
- 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;
- }
-
- if (tb[TCA_TCINDEX_CLASSID]) {
- cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
- tcf_bind_filter(tp, &cr.res, base);
- }
-
- tcf_exts_change(tp, &cr.exts, &e);
-
- tcf_tree_lock(tp);
- if (old_r && old_r != r)
- memset(old_r, 0, sizeof(*old_r));
-
- memcpy(p, &cp, sizeof(cp));
- memcpy(r, &cr, sizeof(cr));
-
- if (r == &new_filter_result) {
- struct tcindex_filter **fp;
-
- f->key = handle;
- f->result = new_filter_result;
- f->next = NULL;
- for (fp = p->h+(handle % p->hash); *fp; fp = &(*fp)->next)
- /* nothing */;
- *fp = f;
- }
- tcf_tree_unlock(tp);
-
- return 0;
-
-errout_alloc:
- if (balloc == 1)
- kfree(cp.perfect);
- else if (balloc == 2)
- kfree(cp.h);
-errout:
- tcf_exts_destroy(tp, &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, unsigned long *arg)
-{
- struct nlattr *opt = tca[TCA_OPTIONS];
- struct nlattr *tb[TCA_TCINDEX_MAX + 1];
- struct tcindex_data *p = PRIV(tp);
- struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg;
- int err;
-
- pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
- "p %p,r %p,*arg 0x%lx\n",
- tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L);
-
- if (!opt)
- return 0;
-
- err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy);
- if (err < 0)
- return err;
-
- return tcindex_set_parms(net, tp, base, handle, p, r, tb,
- tca[TCA_RATE]);
-}
-
-
-static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
-{
- struct tcindex_data *p = PRIV(tp);
- 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,
- (unsigned long) (p->perfect+i), walker)
- < 0) {
- walker->stop = 1;
- return;
- }
- }
- walker->count++;
- }
- }
- if (!p->h)
- return;
- for (i = 0; i < p->hash; i++) {
- for (f = p->h[i]; f; f = next) {
- next = f->next;
- if (walker->count >= walker->skip) {
- if (walker->fn(tp, (unsigned long) &f->result,
- walker) < 0) {
- walker->stop = 1;
- return;
- }
- }
- walker->count++;
- }
- }
-}
-
-
-static int tcindex_destroy_element(struct tcf_proto *tp,
- unsigned long arg, struct tcf_walker *walker)
-{
- return __tcindex_delete(tp, arg, 0);
-}
-
-
-static void tcindex_destroy(struct tcf_proto *tp)
-{
- struct tcindex_data *p = PRIV(tp);
- struct tcf_walker walker;
-
- pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
- walker.count = 0;
- walker.skip = 0;
- walker.fn = &tcindex_destroy_element;
- tcindex_walk(tp, &walker);
- kfree(p->perfect);
- kfree(p->h);
- kfree(p);
- tp->root = NULL;
-}
-
-
-static int tcindex_dump(struct tcf_proto *tp, unsigned long fh,
- struct sk_buff *skb, struct tcmsg *t)
-{
- struct tcindex_data *p = PRIV(tp);
- struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh;
- unsigned char *b = skb_tail_pointer(skb);
- struct nlattr *nest;
-
- pr_debug("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p,b %p\n",
- tp, fh, skb, t, p, r, b);
- pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
-
- nest = nla_nest_start(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;
- int i;
-
- t->tcm_handle = 0;
- for (i = 0; !t->tcm_handle && i < p->hash; i++) {
- for (f = p->h[i]; !t->tcm_handle && f;
- f = f->next) {
- 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, &tcindex_ext_map) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest);
-
- if (tcf_exts_dump_stats(skb, &r->exts, &tcindex_ext_map) < 0)
- goto nla_put_failure;
- }
-
- return skb->len;
-
-nla_put_failure:
- nlmsg_trim(skb, b);
- return -1;
-}
-
-static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
- .kind = "tcindex",
- .classify = tcindex_classify,
- .init = tcindex_init,
- .destroy = tcindex_destroy,
- .get = tcindex_get,
- .put = tcindex_put,
- .change = tcindex_change,
- .delete = tcindex_delete,
- .walk = tcindex_walk,
- .dump = tcindex_dump,
- .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");
generated by cgit (git 2.34.1) at 2025-12-25 04:13:01 +0000