net/sched/cls_fw.c - LeafOS-Devices/android_kernel_samsung_universal7904 - Gitiles

 /*
  * net/sched/cls_fw.c	Classifier mapping ipchains' fwmark to traffic class.
  *
  *		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>
  *
  * Changes:
  * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
  * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
  * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
  *
  * JHS: We should remove the CONFIG_NET_CLS_IND from here
  * eventually when the meta match extension is made available
  *
  */

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/skbuff.h>
 #include <net/netlink.h>
 #include <net/act_api.h>
 #include <net/pkt_cls.h>

 #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))

 struct fw_head {
 	struct fw_filter *ht[HTSIZE];
 	u32 mask;
 };

 struct fw_filter {
 	struct fw_filter	*next;
 	u32			id;
 	struct tcf_result	res;
 #ifdef CONFIG_NET_CLS_IND
 	char			indev[IFNAMSIZ];
 #endif /* CONFIG_NET_CLS_IND */
 	struct tcf_exts		exts;
 };

 static const struct tcf_ext_map fw_ext_map = {
 	.action = TCA_FW_ACT,
 	.police = TCA_FW_POLICE
 };

 static inline int fw_hash(u32 handle)
 {
 	if (HTSIZE == 4096)
 		return ((handle >> 24) & 0xFFF) ^
 		       ((handle >> 12) & 0xFFF) ^
 		       (handle & 0xFFF);
 	else if (HTSIZE == 2048)
 		return ((handle >> 22) & 0x7FF) ^
 		       ((handle >> 11) & 0x7FF) ^
 		       (handle & 0x7FF);
 	else if (HTSIZE == 1024)
 		return ((handle >> 20) & 0x3FF) ^
 		       ((handle >> 10) & 0x3FF) ^
 		       (handle & 0x3FF);
 	else if (HTSIZE == 512)
 		return (handle >> 27) ^
 		       ((handle >> 18) & 0x1FF) ^
 		       ((handle >> 9) & 0x1FF) ^
 		       (handle & 0x1FF);
 	else if (HTSIZE == 256) {
 		u8 *t = (u8 *) &handle;
 		return t[0] ^ t[1] ^ t[2] ^ t[3];
 	} else
 		return handle & (HTSIZE - 1);
 }

 static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 			  struct tcf_result *res)
 {
 	struct fw_head *head = (struct fw_head *)tp->root;
 	struct fw_filter *f;
 	int r;
 	u32 id = skb->mark;

 	if (head != NULL) {
 		id &= head->mask;
 		for (f = head->ht[fw_hash(id)]; f; f = f->next) {
 			if (f->id == id) {
 				*res = f->res;
 #ifdef CONFIG_NET_CLS_IND
 				if (!tcf_match_indev(skb, f->indev))
 					continue;
 #endif /* CONFIG_NET_CLS_IND */
 				r = tcf_exts_exec(skb, &f->exts, res);
 				if (r < 0)
 					continue;

 				return r;
 			}
 		}
 	} else {
 		/* 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 unsigned long fw_get(struct tcf_proto *tp, u32 handle)
 {
 	struct fw_head *head = (struct fw_head *)tp->root;
 	struct fw_filter *f;

 	if (head == NULL)
 		return 0;

 	for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
 		if (f->id == handle)
 			return (unsigned long)f;
 	}
 	return 0;
 }

 static void fw_put(struct tcf_proto *tp, unsigned long f)
 {
 }

 static int fw_init(struct tcf_proto *tp)
 {
 	return 0;
 }

 static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
 {
 	tcf_unbind_filter(tp, &f->res);
 	tcf_exts_destroy(tp, &f->exts);
 	kfree(f);
 }

 static void fw_destroy(struct tcf_proto *tp)
 {
 	struct fw_head *head = tp->root;
 	struct fw_filter *f;
 	int h;

 	if (head == NULL)
 		return;

 	for (h = 0; h < HTSIZE; h++) {
 		while ((f = head->ht[h]) != NULL) {
 			head->ht[h] = f->next;
 			fw_delete_filter(tp, f);
 		}
 	}
 	kfree(head);
 }

 static int fw_delete(struct tcf_proto *tp, unsigned long arg)
 {
 	struct fw_head *head = (struct fw_head *)tp->root;
 	struct fw_filter *f = (struct fw_filter *)arg;
 	struct fw_filter **fp;

 	if (head == NULL || f == NULL)
 		goto out;

 	for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
 		if (*fp == f) {
 			tcf_tree_lock(tp);
 			*fp = f->next;
 			tcf_tree_unlock(tp);
 			fw_delete_filter(tp, f);
 			return 0;
 		}
 	}
 out:
 	return -EINVAL;
 }

 static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
 	[TCA_FW_CLASSID]	= { .type = NLA_U32 },
 	[TCA_FW_INDEV]		= { .type = NLA_STRING, .len = IFNAMSIZ },
 	[TCA_FW_MASK]		= { .type = NLA_U32 },
 };

 static int
 fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
 	struct nlattr **tb, struct nlattr **tca, unsigned long base)
 {
 	struct fw_head *head = (struct fw_head *)tp->root;
 	struct tcf_exts e;
 	u32 mask;
 	int err;

 	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
 	if (err < 0)
 		return err;

 	if (tb[TCA_FW_CLASSID]) {
 		f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
 		tcf_bind_filter(tp, &f->res, base);
 	}

 #ifdef CONFIG_NET_CLS_IND
 	if (tb[TCA_FW_INDEV]) {
 		err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
 		if (err < 0)
 			goto errout;
 	}
 #endif /* CONFIG_NET_CLS_IND */

 	err = -EINVAL;
 	if (tb[TCA_FW_MASK]) {
 		mask = nla_get_u32(tb[TCA_FW_MASK]);
 		if (mask != head->mask)
 			goto errout;
 	} else if (head->mask != 0xFFFFFFFF)
 		goto errout;

 	tcf_exts_change(tp, &f->exts, &e);

 	return 0;
 errout:
 	tcf_exts_destroy(tp, &e);
 	return err;
 }

 static int fw_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 fw_head *head = (struct fw_head *)tp->root;
 	struct fw_filter *f = (struct fw_filter *) *arg;
 	struct nlattr *opt = tca[TCA_OPTIONS];
 	struct nlattr *tb[TCA_FW_MAX + 1];
 	int err;

 	if (!opt)
 		return handle ? -EINVAL : 0;

 	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
 	if (err < 0)
 		return err;

 	if (f != NULL) {
 		if (f->id != handle && handle)
 			return -EINVAL;
 		return fw_change_attrs(net, tp, f, tb, tca, base);
 	}

 	if (!handle)
 		return -EINVAL;

 	if (head == NULL) {
 		u32 mask = 0xFFFFFFFF;
 		if (tb[TCA_FW_MASK])
 			mask = nla_get_u32(tb[TCA_FW_MASK]);

 		head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
 		if (head == NULL)
 			return -ENOBUFS;
 		head->mask = mask;

 		tcf_tree_lock(tp);
 		tp->root = head;
 		tcf_tree_unlock(tp);
 	}

 	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
 	if (f == NULL)
 		return -ENOBUFS;

 	tcf_exts_init(&f->exts);
 	f->id = handle;

 	err = fw_change_attrs(net, tp, f, tb, tca, base);
 	if (err < 0)
 		goto errout;

 	f->next = head->ht[fw_hash(handle)];
 	tcf_tree_lock(tp);
 	head->ht[fw_hash(handle)] = f;
 	tcf_tree_unlock(tp);

 	*arg = (unsigned long)f;
 	return 0;

 errout:
 	kfree(f);
 	return err;
 }

 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 {
 	struct fw_head *head = (struct fw_head *)tp->root;
 	int h;

 	if (head == NULL)
 		arg->stop = 1;

 	if (arg->stop)
 		return;

 	for (h = 0; h < HTSIZE; h++) {
 		struct fw_filter *f;

 		for (f = head->ht[h]; 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 fw_dump(struct tcf_proto *tp, unsigned long fh,
 		   struct sk_buff *skb, struct tcmsg *t)
 {
 	struct fw_head *head = (struct fw_head *)tp->root;
 	struct fw_filter *f = (struct fw_filter *)fh;
 	unsigned char *b = skb_tail_pointer(skb);
 	struct nlattr *nest;

 	if (f == NULL)
 		return skb->len;

 	t->tcm_handle = f->id;

 	if (!f->res.classid && !tcf_exts_is_available(&f->exts))
 		return skb->len;

 	nest = nla_nest_start(skb, TCA_OPTIONS);
 	if (nest == NULL)
 		goto nla_put_failure;

 	if (f->res.classid &&
 	    nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
 		goto nla_put_failure;
 #ifdef CONFIG_NET_CLS_IND
 	if (strlen(f->indev) &&
 	    nla_put_string(skb, TCA_FW_INDEV, f->indev))
 		goto nla_put_failure;
 #endif /* CONFIG_NET_CLS_IND */
 	if (head->mask != 0xFFFFFFFF &&
 	    nla_put_u32(skb, TCA_FW_MASK, head->mask))
 		goto nla_put_failure;

 	if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
 		goto nla_put_failure;

 	nla_nest_end(skb, nest);

 	if (tcf_exts_dump_stats(skb, &f->exts, &fw_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_fw_ops __read_mostly = {
 	.kind		=	"fw",
 	.classify	=	fw_classify,
 	.init		=	fw_init,
 	.destroy	=	fw_destroy,
 	.get		=	fw_get,
 	.put		=	fw_put,
 	.change		=	fw_change,
 	.delete		=	fw_delete,
 	.walk		=	fw_walk,
 	.dump		=	fw_dump,
 	.owner		=	THIS_MODULE,
 };

 static int __init init_fw(void)
 {
 	return register_tcf_proto_ops(&cls_fw_ops);
 }

 static void __exit exit_fw(void)
 {
 	unregister_tcf_proto_ops(&cls_fw_ops);
 }

 module_init(init_fw)
 module_exit(exit_fw)
 MODULE_LICENSE("GPL");
	/*
	* net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
	*
	* 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>
	*
	* Changes:
	* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
	* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
	* Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
	*
	* JHS: We should remove the CONFIG_NET_CLS_IND from here
	* eventually when the meta match extension is made available
	*
	*/

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/skbuff.h>
	#include <net/netlink.h>
	#include <net/act_api.h>
	#include <net/pkt_cls.h>

	#define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))

	struct fw_head {
	struct fw_filter *ht[HTSIZE];
	u32 mask;
	};

	struct fw_filter {
	struct fw_filter *next;
	u32 id;
	struct tcf_result res;
	#ifdef CONFIG_NET_CLS_IND
	char indev[IFNAMSIZ];
	#endif /* CONFIG_NET_CLS_IND */
	struct tcf_exts exts;
	};

	static const struct tcf_ext_map fw_ext_map = {
	.action = TCA_FW_ACT,
	.police = TCA_FW_POLICE
	};

	static inline int fw_hash(u32 handle)
	{
	if (HTSIZE == 4096)
	return ((handle >> 24) & 0xFFF) ^
	((handle >> 12) & 0xFFF) ^
	(handle & 0xFFF);
	else if (HTSIZE == 2048)
	return ((handle >> 22) & 0x7FF) ^
	((handle >> 11) & 0x7FF) ^
	(handle & 0x7FF);
	else if (HTSIZE == 1024)
	return ((handle >> 20) & 0x3FF) ^
	((handle >> 10) & 0x3FF) ^
	(handle & 0x3FF);
	else if (HTSIZE == 512)
	return (handle >> 27) ^
	((handle >> 18) & 0x1FF) ^
	((handle >> 9) & 0x1FF) ^
	(handle & 0x1FF);
	else if (HTSIZE == 256) {
	u8 t = (u8 ) &handle;
	return t[0] ^ t[1] ^ t[2] ^ t[3];
	} else
	return handle & (HTSIZE - 1);
	}

	static int fw_classify(struct sk_buff skb, const struct tcf_proto tp,
	struct tcf_result *res)
	{
	struct fw_head head = (struct fw_head )tp->root;
	struct fw_filter *f;
	int r;
	u32 id = skb->mark;

	if (head != NULL) {
	id &= head->mask;
	for (f = head->ht[fw_hash(id)]; f; f = f->next) {
	if (f->id == id) {
	*res = f->res;
	#ifdef CONFIG_NET_CLS_IND
	if (!tcf_match_indev(skb, f->indev))
	continue;
	#endif /* CONFIG_NET_CLS_IND */
	r = tcf_exts_exec(skb, &f->exts, res);
	if (r < 0)
	continue;

	return r;
	}
	}
	} else {
	/* 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 unsigned long fw_get(struct tcf_proto *tp, u32 handle)
	{
	struct fw_head head = (struct fw_head )tp->root;
	struct fw_filter *f;

	if (head == NULL)
	return 0;

	for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
	if (f->id == handle)
	return (unsigned long)f;
	}
	return 0;
	}

	static void fw_put(struct tcf_proto *tp, unsigned long f)
	{
	}

	static int fw_init(struct tcf_proto *tp)
	{
	return 0;
	}

	static void fw_delete_filter(struct tcf_proto tp, struct fw_filter f)
	{
	tcf_unbind_filter(tp, &f->res);
	tcf_exts_destroy(tp, &f->exts);
	kfree(f);
	}

	static void fw_destroy(struct tcf_proto *tp)
	{
	struct fw_head *head = tp->root;
	struct fw_filter *f;
	int h;

	if (head == NULL)
	return;

	for (h = 0; h < HTSIZE; h++) {
	while ((f = head->ht[h]) != NULL) {
	head->ht[h] = f->next;
	fw_delete_filter(tp, f);
	}
	}
	kfree(head);
	}

	static int fw_delete(struct tcf_proto *tp, unsigned long arg)
	{
	struct fw_head head = (struct fw_head )tp->root;
	struct fw_filter f = (struct fw_filter )arg;
	struct fw_filter **fp;

	if (head == NULL \|\| f == NULL)
	goto out;

	for (fp = &head->ht[fw_hash(f->id)]; fp; fp = &(fp)->next) {
	if (*fp == f) {
	tcf_tree_lock(tp);
	*fp = f->next;
	tcf_tree_unlock(tp);
	fw_delete_filter(tp, f);
	return 0;
	}
	}
	out:
	return -EINVAL;
	}

	static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	[TCA_FW_CLASSID] = { .type = NLA_U32 },
	[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	[TCA_FW_MASK] = { .type = NLA_U32 },
	};

	static int
	fw_change_attrs(struct net net, struct tcf_proto tp, struct fw_filter *f,
	struct nlattr tb, struct nlattr tca, unsigned long base)
	{
	struct fw_head head = (struct fw_head )tp->root;
	struct tcf_exts e;
	u32 mask;
	int err;

	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
	if (err < 0)
	return err;

	if (tb[TCA_FW_CLASSID]) {
	f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
	tcf_bind_filter(tp, &f->res, base);
	}

	#ifdef CONFIG_NET_CLS_IND
	if (tb[TCA_FW_INDEV]) {
	err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
	if (err < 0)
	goto errout;
	}
	#endif /* CONFIG_NET_CLS_IND */

	err = -EINVAL;
	if (tb[TCA_FW_MASK]) {
	mask = nla_get_u32(tb[TCA_FW_MASK]);
	if (mask != head->mask)
	goto errout;
	} else if (head->mask != 0xFFFFFFFF)
	goto errout;

	tcf_exts_change(tp, &f->exts, &e);

	return 0;
	errout:
	tcf_exts_destroy(tp, &e);
	return err;
	}

	static int fw_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 fw_head head = (struct fw_head )tp->root;
	struct fw_filter f = (struct fw_filter ) *arg;
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_FW_MAX + 1];
	int err;

	if (!opt)
	return handle ? -EINVAL : 0;

	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
	if (err < 0)
	return err;

	if (f != NULL) {
	if (f->id != handle && handle)
	return -EINVAL;
	return fw_change_attrs(net, tp, f, tb, tca, base);
	}

	if (!handle)
	return -EINVAL;

	if (head == NULL) {
	u32 mask = 0xFFFFFFFF;
	if (tb[TCA_FW_MASK])
	mask = nla_get_u32(tb[TCA_FW_MASK]);

	head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
	if (head == NULL)
	return -ENOBUFS;
	head->mask = mask;

	tcf_tree_lock(tp);
	tp->root = head;
	tcf_tree_unlock(tp);
	}

	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	if (f == NULL)
	return -ENOBUFS;

	tcf_exts_init(&f->exts);
	f->id = handle;

	err = fw_change_attrs(net, tp, f, tb, tca, base);
	if (err < 0)
	goto errout;

	f->next = head->ht[fw_hash(handle)];
	tcf_tree_lock(tp);
	head->ht[fw_hash(handle)] = f;
	tcf_tree_unlock(tp);

	*arg = (unsigned long)f;
	return 0;

	errout:
	kfree(f);
	return err;
	}

	static void fw_walk(struct tcf_proto tp, struct tcf_walker arg)
	{
	struct fw_head head = (struct fw_head )tp->root;
	int h;

	if (head == NULL)
	arg->stop = 1;

	if (arg->stop)
	return;

	for (h = 0; h < HTSIZE; h++) {
	struct fw_filter *f;

	for (f = head->ht[h]; 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 fw_dump(struct tcf_proto *tp, unsigned long fh,
	struct sk_buff skb, struct tcmsg t)
	{
	struct fw_head head = (struct fw_head )tp->root;
	struct fw_filter f = (struct fw_filter )fh;
	unsigned char *b = skb_tail_pointer(skb);
	struct nlattr *nest;

	if (f == NULL)
	return skb->len;

	t->tcm_handle = f->id;

	if (!f->res.classid && !tcf_exts_is_available(&f->exts))
	return skb->len;

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
	goto nla_put_failure;

	if (f->res.classid &&
	nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
	goto nla_put_failure;
	#ifdef CONFIG_NET_CLS_IND
	if (strlen(f->indev) &&
	nla_put_string(skb, TCA_FW_INDEV, f->indev))
	goto nla_put_failure;
	#endif /* CONFIG_NET_CLS_IND */
	if (head->mask != 0xFFFFFFFF &&
	nla_put_u32(skb, TCA_FW_MASK, head->mask))
	goto nla_put_failure;

	if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
	goto nla_put_failure;

	nla_nest_end(skb, nest);

	if (tcf_exts_dump_stats(skb, &f->exts, &fw_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_fw_ops __read_mostly = {
	.kind = "fw",
	.classify = fw_classify,
	.init = fw_init,
	.destroy = fw_destroy,
	.get = fw_get,
	.put = fw_put,
	.change = fw_change,
	.delete = fw_delete,
	.walk = fw_walk,
	.dump = fw_dump,
	.owner = THIS_MODULE,
	};

	static int __init init_fw(void)
	{
	return register_tcf_proto_ops(&cls_fw_ops);
	}

	static void __exit exit_fw(void)
	{
	unregister_tcf_proto_ops(&cls_fw_ops);
	}

	module_init(init_fw)
	module_exit(exit_fw)
	MODULE_LICENSE("GPL");