Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 639 insertions, 0 deletions

diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
new file mode 100644
index 00000000000..02996ac05c7
--- /dev/null
+++ b/net/sched/cls_route.c
@@ -0,0 +1,639 @@
+/*
+ * net/sched/cls_route.c	ROUTE4 classifier.
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/notifier.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/act_api.h>
+#include <net/pkt_cls.h>
+
+/*
+   1. For now we assume that route tags < 256.
+      It allows to use direct table lookups, instead of hash tables.
+   2. For now we assume that "from TAG" and "fromdev DEV" statements
+      are mutually  exclusive.
+   3. "to TAG from ANY" has higher priority, than "to ANY from XXX"
+ */
+
+struct route4_fastmap
+{
+	struct route4_filter	*filter;
+	u32			id;
+	int			iif;
+};
+
+struct route4_head
+{
+	struct route4_fastmap	fastmap[16];
+	struct route4_bucket	*table[256+1];
+};
+
+struct route4_bucket
+{
+	/* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */
+	struct route4_filter	*ht[16+16+1];
+};
+
+struct route4_filter
+{
+	struct route4_filter	*next;
+	u32			id;
+	int			iif;
+
+	struct tcf_result	res;
+	struct tcf_exts		exts;
+	u32			handle;
+	struct route4_bucket	*bkt;
+};
+
+#define ROUTE4_FAILURE ((struct route4_filter*)(-1L))
+
+static struct tcf_ext_map route_ext_map = {
+	.police = TCA_ROUTE4_POLICE,
+	.action = TCA_ROUTE4_ACT
+};
+
+static __inline__ int route4_fastmap_hash(u32 id, int iif)
+{
+	return id&0xF;
+}
+
+static inline
+void route4_reset_fastmap(struct net_device *dev, struct route4_head *head, u32 id)
+{
+	spin_lock_bh(&dev->queue_lock);
+	memset(head->fastmap, 0, sizeof(head->fastmap));
+	spin_unlock_bh(&dev->queue_lock);
+}
+
+static void __inline__
+route4_set_fastmap(struct route4_head *head, u32 id, int iif,
+		   struct route4_filter *f)
+{
+	int h = route4_fastmap_hash(id, iif);
+	head->fastmap[h].id = id;
+	head->fastmap[h].iif = iif;
+	head->fastmap[h].filter = f;
+}
+
+static __inline__ int route4_hash_to(u32 id)
+{
+	return id&0xFF;
+}
+
+static __inline__ int route4_hash_from(u32 id)
+{
+	return (id>>16)&0xF;
+}
+
+static __inline__ int route4_hash_iif(int iif)
+{
+	return 16 + ((iif>>16)&0xF);
+}
+
+static __inline__ int route4_hash_wild(void)
+{
+	return 32;
+}
+
+#define ROUTE4_APPLY_RESULT()					\
+{								\
+	*res = f->res;						\
+	if (tcf_exts_is_available(&f->exts)) {			\
+		int r = tcf_exts_exec(skb, &f->exts, res);	\
+		if (r < 0) {					\
+			dont_cache = 1;				\
+			continue;				\
+		}						\
+		return r;					\
+	} else if (!dont_cache)					\
+		route4_set_fastmap(head, id, iif, f);		\
+	return 0;						\
+}
+
+static int route4_classify(struct sk_buff *skb, struct tcf_proto *tp,
+			   struct tcf_result *res)
+{
+	struct route4_head *head = (struct route4_head*)tp->root;
+	struct dst_entry *dst;
+	struct route4_bucket *b;
+	struct route4_filter *f;
+	u32 id, h;
+	int iif, dont_cache = 0;
+
+	if ((dst = skb->dst) == NULL)
+		goto failure;
+
+	id = dst->tclassid;
+	if (head == NULL)
+		goto old_method;
+
+	iif = ((struct rtable*)dst)->fl.iif;
+
+	h = route4_fastmap_hash(id, iif);
+	if (id == head->fastmap[h].id &&
+	    iif == head->fastmap[h].iif &&
+	    (f = head->fastmap[h].filter) != NULL) {
+		if (f == ROUTE4_FAILURE)
+			goto failure;
+
+		*res = f->res;
+		return 0;
+	}
+
+	h = route4_hash_to(id);
+
+restart:
+	if ((b = head->table[h]) != NULL) {
+		for (f = b->ht[route4_hash_from(id)]; f; f = f->next)
+			if (f->id == id)
+				ROUTE4_APPLY_RESULT();
+
+		for (f = b->ht[route4_hash_iif(iif)]; f; f = f->next)
+			if (f->iif == iif)
+				ROUTE4_APPLY_RESULT();
+
+		for (f = b->ht[route4_hash_wild()]; f; f = f->next)
+			ROUTE4_APPLY_RESULT();
+
+	}
+	if (h < 256) {
+		h = 256;
+		id &= ~0xFFFF;
+		goto restart;
+	}
+
+	if (!dont_cache)
+		route4_set_fastmap(head, id, iif, ROUTE4_FAILURE);
+failure:
+	return -1;
+
+old_method:
+	if (id && (TC_H_MAJ(id) == 0 ||
+		   !(TC_H_MAJ(id^tp->q->handle)))) {
+		res->classid = id;
+		res->class = 0;
+		return 0;
+	}
+	return -1;
+}
+
+static inline u32 to_hash(u32 id)
+{
+	u32 h = id&0xFF;
+	if (id&0x8000)
+		h += 256;
+	return h;
+}
+
+static inline u32 from_hash(u32 id)
+{
+	id &= 0xFFFF;
+	if (id == 0xFFFF)
+		return 32;
+	if (!(id & 0x8000)) {
+		if (id > 255)
+			return 256;
+		return id&0xF;
+	}
+	return 16 + (id&0xF);
+}
+
+static unsigned long route4_get(struct tcf_proto *tp, u32 handle)
+{
+	struct route4_head *head = (struct route4_head*)tp->root;
+	struct route4_bucket *b;
+	struct route4_filter *f;
+	unsigned h1, h2;
+
+	if (!head)
+		return 0;
+
+	h1 = to_hash(handle);
+	if (h1 > 256)
+		return 0;
+
+	h2 = from_hash(handle>>16);
+	if (h2 > 32)
+		return 0;
+
+	if ((b = head->table[h1]) != NULL) {
+		for (f = b->ht[h2]; f; f = f->next)
+			if (f->handle == handle)
+				return (unsigned long)f;
+	}
+	return 0;
+}
+
+static void route4_put(struct tcf_proto *tp, unsigned long f)
+{
+}
+
+static int route4_init(struct tcf_proto *tp)
+{
+	return 0;
+}
+
+static inline void
+route4_delete_filter(struct tcf_proto *tp, struct route4_filter *f)
+{
+	tcf_unbind_filter(tp, &f->res);
+	tcf_exts_destroy(tp, &f->exts);
+	kfree(f);
+}
+
+static void route4_destroy(struct tcf_proto *tp)
+{
+	struct route4_head *head = xchg(&tp->root, NULL);
+	int h1, h2;
+
+	if (head == NULL)
+		return;
+
+	for (h1=0; h1<=256; h1++) {
+		struct route4_bucket *b;
+
+		if ((b = head->table[h1]) != NULL) {
+			for (h2=0; h2<=32; h2++) {
+				struct route4_filter *f;
+
+				while ((f = b->ht[h2]) != NULL) {
+					b->ht[h2] = f->next;
+					route4_delete_filter(tp, f);
+				}
+			}
+			kfree(b);
+		}
+	}
+	kfree(head);
+}
+
+static int route4_delete(struct tcf_proto *tp, unsigned long arg)
+{
+	struct route4_head *head = (struct route4_head*)tp->root;
+	struct route4_filter **fp, *f = (struct route4_filter*)arg;
+	unsigned h = 0;
+	struct route4_bucket *b;
+	int i;
+
+	if (!head || !f)
+		return -EINVAL;
+
+	h = f->handle;
+	b = f->bkt;
+
+	for (fp = &b->ht[from_hash(h>>16)]; *fp; fp = &(*fp)->next) {
+		if (*fp == f) {
+			tcf_tree_lock(tp);
+			*fp = f->next;
+			tcf_tree_unlock(tp);
+
+			route4_reset_fastmap(tp->q->dev, head, f->id);
+			route4_delete_filter(tp, f);
+
+			/* Strip tree */
+
+			for (i=0; i<=32; i++)
+				if (b->ht[i])
+					return 0;
+
+			/* OK, session has no flows */
+			tcf_tree_lock(tp);
+			head->table[to_hash(h)] = NULL;
+			tcf_tree_unlock(tp);
+
+			kfree(b);
+			return 0;
+		}
+	}
+	return 0;
+}
+
+static int route4_set_parms(struct tcf_proto *tp, unsigned long base,
+	struct route4_filter *f, u32 handle, struct route4_head *head,
+	struct rtattr **tb, struct rtattr *est, int new)
+{
+	int err;
+	u32 id = 0, to = 0, nhandle = 0x8000;
+	struct route4_filter *fp;
+	unsigned int h1;
+	struct route4_bucket *b;
+	struct tcf_exts e;
+
+	err = tcf_exts_validate(tp, tb, est, &e, &route_ext_map);
+	if (err < 0)
+		return err;
+
+	err = -EINVAL;
+	if (tb[TCA_ROUTE4_CLASSID-1])
+		if (RTA_PAYLOAD(tb[TCA_ROUTE4_CLASSID-1]) < sizeof(u32))
+			goto errout;
+
+	if (tb[TCA_ROUTE4_TO-1]) {
+		if (new && handle & 0x8000)
+			goto errout;
+		if (RTA_PAYLOAD(tb[TCA_ROUTE4_TO-1]) < sizeof(u32))
+			goto errout;
+		to = *(u32*)RTA_DATA(tb[TCA_ROUTE4_TO-1]);
+		if (to > 0xFF)
+			goto errout;
+		nhandle = to;
+	}
+
+	if (tb[TCA_ROUTE4_FROM-1]) {
+		if (tb[TCA_ROUTE4_IIF-1])
+			goto errout;
+		if (RTA_PAYLOAD(tb[TCA_ROUTE4_FROM-1]) < sizeof(u32))
+			goto errout;
+		id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_FROM-1]);
+		if (id > 0xFF)
+			goto errout;
+		nhandle |= id << 16;
+	} else if (tb[TCA_ROUTE4_IIF-1]) {
+		if (RTA_PAYLOAD(tb[TCA_ROUTE4_IIF-1]) < sizeof(u32))
+			goto errout;
+		id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_IIF-1]);
+		if (id > 0x7FFF)
+			goto errout;
+		nhandle |= (id | 0x8000) << 16;
+	} else
+		nhandle |= 0xFFFF << 16;
+
+	if (handle && new) {
+		nhandle |= handle & 0x7F00;
+		if (nhandle != handle)
+			goto errout;
+	}
+
+	h1 = to_hash(nhandle);
+	if ((b = head->table[h1]) == NULL) {
+		err = -ENOBUFS;
+		b = kmalloc(sizeof(struct route4_bucket), GFP_KERNEL);
+		if (b == NULL)
+			goto errout;
+		memset(b, 0, sizeof(*b));
+
+		tcf_tree_lock(tp);
+		head->table[h1] = b;
+		tcf_tree_unlock(tp);
+	} else {
+		unsigned int h2 = from_hash(nhandle >> 16);
+		err = -EEXIST;
+		for (fp = b->ht[h2]; fp; fp = fp->next)
+			if (fp->handle == f->handle)
+				goto errout;
+	}
+
+	tcf_tree_lock(tp);
+	if (tb[TCA_ROUTE4_TO-1])
+		f->id = to;
+
+	if (tb[TCA_ROUTE4_FROM-1])
+		f->id = to | id<<16;
+	else if (tb[TCA_ROUTE4_IIF-1])
+		f->iif = id;
+
+	f->handle = nhandle;
+	f->bkt = b;
+	tcf_tree_unlock(tp);
+
+	if (tb[TCA_ROUTE4_CLASSID-1]) {
+		f->res.classid = *(u32*)RTA_DATA(tb[TCA_ROUTE4_CLASSID-1]);
+		tcf_bind_filter(tp, &f->res, base);
+	}
+
+	tcf_exts_change(tp, &f->exts, &e);
+
+	return 0;
+errout:
+	tcf_exts_destroy(tp, &e);
+	return err;
+}
+
+static int route4_change(struct tcf_proto *tp, unsigned long base,
+		       u32 handle,
+		       struct rtattr **tca,
+		       unsigned long *arg)
+{
+	struct route4_head *head = tp->root;
+	struct route4_filter *f, *f1, **fp;
+	struct route4_bucket *b;
+	struct rtattr *opt = tca[TCA_OPTIONS-1];
+	struct rtattr *tb[TCA_ROUTE4_MAX];
+	unsigned int h, th;
+	u32 old_handle = 0;
+	int err;
+
+	if (opt == NULL)
+		return handle ? -EINVAL : 0;
+
+	if (rtattr_parse_nested(tb, TCA_ROUTE4_MAX, opt) < 0)
+		return -EINVAL;
+
+	if ((f = (struct route4_filter*)*arg) != NULL) {
+		if (f->handle != handle && handle)
+			return -EINVAL;
+
+		if (f->bkt)
+			old_handle = f->handle;
+
+		err = route4_set_parms(tp, base, f, handle, head, tb,
+			tca[TCA_RATE-1], 0);
+		if (err < 0)
+			return err;
+
+		goto reinsert;
+	}
+
+	err = -ENOBUFS;
+	if (head == NULL) {
+		head = kmalloc(sizeof(struct route4_head), GFP_KERNEL);
+		if (head == NULL)
+			goto errout;
+		memset(head, 0, sizeof(struct route4_head));
+
+		tcf_tree_lock(tp);
+		tp->root = head;
+		tcf_tree_unlock(tp);
+	}
+
+	f = kmalloc(sizeof(struct route4_filter), GFP_KERNEL);
+	if (f == NULL)
+		goto errout;
+	memset(f, 0, sizeof(*f));
+
+	err = route4_set_parms(tp, base, f, handle, head, tb,
+		tca[TCA_RATE-1], 1);
+	if (err < 0)
+		goto errout;
+
+reinsert:
+	h = from_hash(f->handle >> 16);
+	for (fp = &f->bkt->ht[h]; (f1=*fp) != NULL; fp = &f1->next)
+		if (f->handle < f1->handle)
+			break;
+
+	f->next = f1;
+	tcf_tree_lock(tp);
+	*fp = f;
+
+	if (old_handle && f->handle != old_handle) {
+		th = to_hash(old_handle);
+		h = from_hash(old_handle >> 16);
+		if ((b = head->table[th]) != NULL) {
+			for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) {
+				if (*fp == f) {
+					*fp = f->next;
+					break;
+				}
+			}
+		}
+	}
+	tcf_tree_unlock(tp);
+
+	route4_reset_fastmap(tp->q->dev, head, f->id);
+	*arg = (unsigned long)f;
+	return 0;
+
+errout:
+	if (f)
+		kfree(f);
+	return err;
+}
+
+static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+	struct route4_head *head = tp->root;
+	unsigned h, h1;
+
+	if (head == NULL)
+		arg->stop = 1;
+
+	if (arg->stop)
+		return;
+
+	for (h = 0; h <= 256; h++) {
+		struct route4_bucket *b = head->table[h];
+
+		if (b) {
+			for (h1 = 0; h1 <= 32; h1++) {
+				struct route4_filter *f;
+
+				for (f = b->ht[h1]; f; f = f->next) {
+					if (arg->count < arg->skip) {
+						arg->count++;
+						continue;
+					}
+					if (arg->fn(tp, (unsigned long)f, arg) < 0) {
+						arg->stop = 1;
+						return;
+					}
+					arg->count++;
+				}
+			}
+		}
+	}
+}
+
+static int route4_dump(struct tcf_proto *tp, unsigned long fh,
+		       struct sk_buff *skb, struct tcmsg *t)
+{
+	struct route4_filter *f = (struct route4_filter*)fh;
+	unsigned char	 *b = skb->tail;
+	struct rtattr *rta;
+	u32 id;
+
+	if (f == NULL)
+		return skb->len;
+
+	t->tcm_handle = f->handle;
+
+	rta = (struct rtattr*)b;
+	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
+
+	if (!(f->handle&0x8000)) {
+		id = f->id&0xFF;
+		RTA_PUT(skb, TCA_ROUTE4_TO, sizeof(id), &id);
+	}
+	if (f->handle&0x80000000) {
+		if ((f->handle>>16) != 0xFFFF)
+			RTA_PUT(skb, TCA_ROUTE4_IIF, sizeof(f->iif), &f->iif);
+	} else {
+		id = f->id>>16;
+		RTA_PUT(skb, TCA_ROUTE4_FROM, sizeof(id), &id);
+	}
+	if (f->res.classid)
+		RTA_PUT(skb, TCA_ROUTE4_CLASSID, 4, &f->res.classid);
+
+	if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0)
+		goto rtattr_failure;
+
+	rta->rta_len = skb->tail - b;
+
+	if (tcf_exts_dump_stats(skb, &f->exts, &route_ext_map) < 0)
+		goto rtattr_failure;
+
+	return skb->len;
+
+rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static struct tcf_proto_ops cls_route4_ops = {
+	.next		=	NULL,
+	.kind		=	"route",
+	.classify	=	route4_classify,
+	.init		=	route4_init,
+	.destroy	=	route4_destroy,
+	.get		=	route4_get,
+	.put		=	route4_put,
+	.change		=	route4_change,
+	.delete		=	route4_delete,
+	.walk		=	route4_walk,
+	.dump		=	route4_dump,
+	.owner		=	THIS_MODULE,
+};
+
+static int __init init_route4(void)
+{
+	return register_tcf_proto_ops(&cls_route4_ops);
+}
+
+static void __exit exit_route4(void)
+{
+	unregister_tcf_proto_ops(&cls_route4_ops);
+}
+
+module_init(init_route4)
+module_exit(exit_route4)
+MODULE_LICENSE("GPL");