[net-next-2.6.git] / net / sched / cls_flow.c

/*
 * net/sched/cls_flow.c		Generic flow classifier
 *
 * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/jhash.h>
#include <linux/random.h>
#include <linux/pkt_cls.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/if_vlan.h>
#include <linux/slab.h>

#include <net/pkt_cls.h>
#include <net/ip.h>
#include <net/route.h>
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#include <net/netfilter/nf_conntrack.h>
#endif

struct flow_head {
	struct list_head	filters;
};

struct flow_filter {
	struct list_head	list;
	struct tcf_exts		exts;
	struct tcf_ematch_tree	ematches;
	struct timer_list	perturb_timer;
	u32			perturb_period;
	u32			handle;

	u32			nkeys;
	u32			keymask;
	u32			mode;
	u32			mask;
	u32			xor;
	u32			rshift;
	u32			addend;
	u32			divisor;
	u32			baseclass;
	u32			hashrnd;
};

static const struct tcf_ext_map flow_ext_map = {
	.action	= TCA_FLOW_ACT,
	.police	= TCA_FLOW_POLICE,
};

static inline u32 addr_fold(void *addr)
{
	unsigned long a = (unsigned long)addr;

	return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
}

static u32 flow_get_src(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP):
		if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
			return ntohl(ip_hdr(skb)->saddr);
		break;
	case htons(ETH_P_IPV6):
		if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
			return ntohl(ipv6_hdr(skb)->saddr.s6_addr32[3]);
		break;
	}

	return addr_fold(skb->sk);
}

static u32 flow_get_dst(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP):
		if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
			return ntohl(ip_hdr(skb)->daddr);
		break;
	case htons(ETH_P_IPV6):
		if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
			return ntohl(ipv6_hdr(skb)->daddr.s6_addr32[3]);
		break;
	}

	return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
}

static u32 flow_get_proto(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP):
		return pskb_network_may_pull(skb, sizeof(struct iphdr)) ?
		       ip_hdr(skb)->protocol : 0;
	case htons(ETH_P_IPV6):
		return pskb_network_may_pull(skb, sizeof(struct ipv6hdr)) ?
		       ipv6_hdr(skb)->nexthdr : 0;
	default:
		return 0;
	}
}

static int has_ports(u8 protocol)
{
	switch (protocol) {
	case IPPROTO_TCP:
	case IPPROTO_UDP:
	case IPPROTO_UDPLITE:
	case IPPROTO_SCTP:
	case IPPROTO_DCCP:
	case IPPROTO_ESP:
		return 1;
	default:
		return 0;
	}
}

static u32 flow_get_proto_src(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP): {
		struct iphdr *iph;

		if (!pskb_network_may_pull(skb, sizeof(*iph)))
			break;
		iph = ip_hdr(skb);
		if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
		    has_ports(iph->protocol) &&
		    pskb_network_may_pull(skb, iph->ihl * 4 + 2))
			return ntohs(*(__be16 *)((void *)iph + iph->ihl * 4));
		break;
	}
	case htons(ETH_P_IPV6): {
		struct ipv6hdr *iph;

		if (!pskb_network_may_pull(skb, sizeof(*iph) + 2))
			break;
		iph = ipv6_hdr(skb);
		if (has_ports(iph->nexthdr))
			return ntohs(*(__be16 *)&iph[1]);
		break;
	}
	}

	return addr_fold(skb->sk);
}

static u32 flow_get_proto_dst(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP): {
		struct iphdr *iph;

		if (!pskb_network_may_pull(skb, sizeof(*iph)))
			break;
		iph = ip_hdr(skb);
		if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
		    has_ports(iph->protocol) &&
		    pskb_network_may_pull(skb, iph->ihl * 4 + 4))
			return ntohs(*(__be16 *)((void *)iph + iph->ihl * 4 + 2));
		break;
	}
	case htons(ETH_P_IPV6): {
		struct ipv6hdr *iph;

		if (!pskb_network_may_pull(skb, sizeof(*iph) + 4))
			break;
		iph = ipv6_hdr(skb);
		if (has_ports(iph->nexthdr))
			return ntohs(*(__be16 *)((void *)&iph[1] + 2));
		break;
	}
	}

	return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
}

static u32 flow_get_iif(const struct sk_buff *skb)
{
	return skb->skb_iif;
}

static u32 flow_get_priority(const struct sk_buff *skb)
{
	return skb->priority;
}

static u32 flow_get_mark(const struct sk_buff *skb)
{
	return skb->mark;
}

static u32 flow_get_nfct(const struct sk_buff *skb)
{
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
	return addr_fold(skb->nfct);
#else
	return 0;
#endif
}

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#define CTTUPLE(skb, member)						\
({									\
	enum ip_conntrack_info ctinfo;					\
	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);			\
	if (ct == NULL)							\
		goto fallback;						\
	ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member;			\
})
#else
#define CTTUPLE(skb, member)						\
({									\
	goto fallback;							\
	0;								\
})
#endif

static u32 flow_get_nfct_src(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP):
		return ntohl(CTTUPLE(skb, src.u3.ip));
	case htons(ETH_P_IPV6):
		return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
	}
fallback:
	return flow_get_src(skb);
}

static u32 flow_get_nfct_dst(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP):
		return ntohl(CTTUPLE(skb, dst.u3.ip));
	case htons(ETH_P_IPV6):
		return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
	}
fallback:
	return flow_get_dst(skb);
}

static u32 flow_get_nfct_proto_src(struct sk_buff *skb)
{
	return ntohs(CTTUPLE(skb, src.u.all));
fallback:
	return flow_get_proto_src(skb);
}

static u32 flow_get_nfct_proto_dst(struct sk_buff *skb)
{
	return ntohs(CTTUPLE(skb, dst.u.all));
fallback:
	return flow_get_proto_dst(skb);
}

static u32 flow_get_rtclassid(const struct sk_buff *skb)
{
#ifdef CONFIG_NET_CLS_ROUTE
	if (skb_dst(skb))
		return skb_dst(skb)->tclassid;
#endif
	return 0;
}

static u32 flow_get_skuid(const struct sk_buff *skb)
{
	if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
		return skb->sk->sk_socket->file->f_cred->fsuid;
	return 0;
}

static u32 flow_get_skgid(const struct sk_buff *skb)
{
	if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
		return skb->sk->sk_socket->file->f_cred->fsgid;
	return 0;
}

static u32 flow_get_vlan_tag(const struct sk_buff *skb)
{
	u16 uninitialized_var(tag);

	if (vlan_get_tag(skb, &tag) < 0)
		return 0;
	return tag & VLAN_VID_MASK;
}

static u32 flow_key_get(struct sk_buff *skb, int key)
{
	switch (key) {
	case FLOW_KEY_SRC:
		return flow_get_src(skb);
	case FLOW_KEY_DST:
		return flow_get_dst(skb);
	case FLOW_KEY_PROTO:
		return flow_get_proto(skb);
	case FLOW_KEY_PROTO_SRC:
		return flow_get_proto_src(skb);
	case FLOW_KEY_PROTO_DST:
		return flow_get_proto_dst(skb);
	case FLOW_KEY_IIF:
		return flow_get_iif(skb);
	case FLOW_KEY_PRIORITY:
		return flow_get_priority(skb);
	case FLOW_KEY_MARK:
		return flow_get_mark(skb);
	case FLOW_KEY_NFCT:
		return flow_get_nfct(skb);
	case FLOW_KEY_NFCT_SRC:
		return flow_get_nfct_src(skb);
	case FLOW_KEY_NFCT_DST:
		return flow_get_nfct_dst(skb);
	case FLOW_KEY_NFCT_PROTO_SRC:
		return flow_get_nfct_proto_src(skb);
	case FLOW_KEY_NFCT_PROTO_DST:
		return flow_get_nfct_proto_dst(skb);
	case FLOW_KEY_RTCLASSID:
		return flow_get_rtclassid(skb);
	case FLOW_KEY_SKUID:
		return flow_get_skuid(skb);
	case FLOW_KEY_SKGID:
		return flow_get_skgid(skb);
	case FLOW_KEY_VLAN_TAG:
		return flow_get_vlan_tag(skb);
	default:
		WARN_ON(1);
		return 0;
	}
}

static int flow_classify(struct sk_buff *skb, struct tcf_proto *tp,
			 struct tcf_result *res)
{
	struct flow_head *head = tp->root;
	struct flow_filter *f;
	u32 keymask;
	u32 classid;
	unsigned int n, key;
	int r;

	list_for_each_entry(f, &head->filters, list) {
		u32 keys[f->nkeys];

		if (!tcf_em_tree_match(skb, &f->ematches, NULL))
			continue;

		keymask = f->keymask;

		for (n = 0; n < f->nkeys; n++) {
			key = ffs(keymask) - 1;
			keymask &= ~(1 << key);
			keys[n] = flow_key_get(skb, key);
		}

		if (f->mode == FLOW_MODE_HASH)
			classid = jhash2(keys, f->nkeys, f->hashrnd);
		else {
			classid = keys[0];
			classid = (classid & f->mask) ^ f->xor;
			classid = (classid >> f->rshift) + f->addend;
		}

		if (f->divisor)
			classid %= f->divisor;

		res->class   = 0;
		res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);

		r = tcf_exts_exec(skb, &f->exts, res);
		if (r < 0)
			continue;
		return r;
	}
	return -1;
}

static void flow_perturbation(unsigned long arg)
{
	struct flow_filter *f = (struct flow_filter *)arg;

	get_random_bytes(&f->hashrnd, 4);
	if (f->perturb_period)
		mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
}

static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
	[TCA_FLOW_KEYS]		= { .type = NLA_U32 },
	[TCA_FLOW_MODE]		= { .type = NLA_U32 },
	[TCA_FLOW_BASECLASS]	= { .type = NLA_U32 },
	[TCA_FLOW_RSHIFT]	= { .type = NLA_U32 },
	[TCA_FLOW_ADDEND]	= { .type = NLA_U32 },
	[TCA_FLOW_MASK]		= { .type = NLA_U32 },
	[TCA_FLOW_XOR]		= { .type = NLA_U32 },
	[TCA_FLOW_DIVISOR]	= { .type = NLA_U32 },
	[TCA_FLOW_ACT]		= { .type = NLA_NESTED },
	[TCA_FLOW_POLICE]	= { .type = NLA_NESTED },
	[TCA_FLOW_EMATCHES]	= { .type = NLA_NESTED },
	[TCA_FLOW_PERTURB]	= { .type = NLA_U32 },
};

static int flow_change(struct tcf_proto *tp, unsigned long base,
		       u32 handle, struct nlattr **tca,
		       unsigned long *arg)
{
	struct flow_head *head = tp->root;
	struct flow_filter *f;
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_FLOW_MAX + 1];
	struct tcf_exts e;
	struct tcf_ematch_tree t;
	unsigned int nkeys = 0;
	unsigned int perturb_period = 0;
	u32 baseclass = 0;
	u32 keymask = 0;
	u32 mode;
	int err;

	if (opt == NULL)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
	if (err < 0)
		return err;

	if (tb[TCA_FLOW_BASECLASS]) {
		baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
		if (TC_H_MIN(baseclass) == 0)
			return -EINVAL;
	}

	if (tb[TCA_FLOW_KEYS]) {
		keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);

		nkeys = hweight32(keymask);
		if (nkeys == 0)
			return -EINVAL;

		if (fls(keymask) - 1 > FLOW_KEY_MAX)
			return -EOPNOTSUPP;
	}

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

	err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
	if (err < 0)
		goto err1;

	f = (struct flow_filter *)*arg;
	if (f != NULL) {
		err = -EINVAL;
		if (f->handle != handle && handle)
			goto err2;

		mode = f->mode;
		if (tb[TCA_FLOW_MODE])
			mode = nla_get_u32(tb[TCA_FLOW_MODE]);
		if (mode != FLOW_MODE_HASH && nkeys > 1)
			goto err2;

		if (mode == FLOW_MODE_HASH)
			perturb_period = f->perturb_period;
		if (tb[TCA_FLOW_PERTURB]) {
			if (mode != FLOW_MODE_HASH)
				goto err2;
			perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
		}
	} else {
		err = -EINVAL;
		if (!handle)
			goto err2;
		if (!tb[TCA_FLOW_KEYS])
			goto err2;

		mode = FLOW_MODE_MAP;
		if (tb[TCA_FLOW_MODE])
			mode = nla_get_u32(tb[TCA_FLOW_MODE]);
		if (mode != FLOW_MODE_HASH && nkeys > 1)
			goto err2;

		if (tb[TCA_FLOW_PERTURB]) {
			if (mode != FLOW_MODE_HASH)
				goto err2;
			perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
		}

		if (TC_H_MAJ(baseclass) == 0)
			baseclass = TC_H_MAKE(tp->q->handle, baseclass);
		if (TC_H_MIN(baseclass) == 0)
			baseclass = TC_H_MAKE(baseclass, 1);

		err = -ENOBUFS;
		f = kzalloc(sizeof(*f), GFP_KERNEL);
		if (f == NULL)
			goto err2;

		f->handle = handle;
		f->mask	  = ~0U;

		get_random_bytes(&f->hashrnd, 4);
		f->perturb_timer.function = flow_perturbation;
		f->perturb_timer.data = (unsigned long)f;
		init_timer_deferrable(&f->perturb_timer);
	}

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

	tcf_tree_lock(tp);

	if (tb[TCA_FLOW_KEYS]) {
		f->keymask = keymask;
		f->nkeys   = nkeys;
	}

	f->mode = mode;

	if (tb[TCA_FLOW_MASK])
		f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
	if (tb[TCA_FLOW_XOR])
		f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
	if (tb[TCA_FLOW_RSHIFT])
		f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
	if (tb[TCA_FLOW_ADDEND])
		f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);

	if (tb[TCA_FLOW_DIVISOR])
		f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
	if (baseclass)
		f->baseclass = baseclass;

	f->perturb_period = perturb_period;
	del_timer(&f->perturb_timer);
	if (perturb_period)
		mod_timer(&f->perturb_timer, jiffies + perturb_period);

	if (*arg == 0)
		list_add_tail(&f->list, &head->filters);

	tcf_tree_unlock(tp);

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

err2:
	tcf_em_tree_destroy(tp, &t);
err1:
	tcf_exts_destroy(tp, &e);
	return err;
}

static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f)
{
	del_timer_sync(&f->perturb_timer);
	tcf_exts_destroy(tp, &f->exts);
	tcf_em_tree_destroy(tp, &f->ematches);
	kfree(f);
}

static int flow_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct flow_filter *f = (struct flow_filter *)arg;

	tcf_tree_lock(tp);
	list_del(&f->list);
	tcf_tree_unlock(tp);
	flow_destroy_filter(tp, f);
	return 0;
}

static int flow_init(struct tcf_proto *tp)
{
	struct flow_head *head;

	head = kzalloc(sizeof(*head), GFP_KERNEL);
	if (head == NULL)
		return -ENOBUFS;
	INIT_LIST_HEAD(&head->filters);
	tp->root = head;
	return 0;
}

static void flow_destroy(struct tcf_proto *tp)
{
	struct flow_head *head = tp->root;
	struct flow_filter *f, *next;

	list_for_each_entry_safe(f, next, &head->filters, list) {
		list_del(&f->list);
		flow_destroy_filter(tp, f);
	}
	kfree(head);
}

static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
{
	struct flow_head *head = tp->root;
	struct flow_filter *f;

	list_for_each_entry(f, &head->filters, list)
		if (f->handle == handle)
			return (unsigned long)f;
	return 0;
}

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

static int flow_dump(struct tcf_proto *tp, unsigned long fh,
		     struct sk_buff *skb, struct tcmsg *t)
{
	struct flow_filter *f = (struct flow_filter *)fh;
	struct nlattr *nest;

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

	t->tcm_handle = f->handle;

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

	NLA_PUT_U32(skb, TCA_FLOW_KEYS, f->keymask);
	NLA_PUT_U32(skb, TCA_FLOW_MODE, f->mode);

	if (f->mask != ~0 || f->xor != 0) {
		NLA_PUT_U32(skb, TCA_FLOW_MASK, f->mask);
		NLA_PUT_U32(skb, TCA_FLOW_XOR, f->xor);
	}
	if (f->rshift)
		NLA_PUT_U32(skb, TCA_FLOW_RSHIFT, f->rshift);
	if (f->addend)
		NLA_PUT_U32(skb, TCA_FLOW_ADDEND, f->addend);

	if (f->divisor)
		NLA_PUT_U32(skb, TCA_FLOW_DIVISOR, f->divisor);
	if (f->baseclass)
		NLA_PUT_U32(skb, TCA_FLOW_BASECLASS, f->baseclass);

	if (f->perturb_period)
		NLA_PUT_U32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ);

	if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0)
		goto nla_put_failure;
#ifdef CONFIG_NET_EMATCH
	if (f->ematches.hdr.nmatches &&
	    tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
		goto nla_put_failure;
#endif
	nla_nest_end(skb, nest);

	if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0)
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, nest);
	return -1;
}

static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct flow_head *head = tp->root;
	struct flow_filter *f;

	list_for_each_entry(f, &head->filters, list) {
		if (arg->count < arg->skip)
			goto skip;
		if (arg->fn(tp, (unsigned long)f, arg) < 0) {
			arg->stop = 1;
			break;
		}
skip:
		arg->count++;
	}
}

static struct tcf_proto_ops cls_flow_ops __read_mostly = {
	.kind		= "flow",
	.classify	= flow_classify,
	.init		= flow_init,
	.destroy	= flow_destroy,
	.change		= flow_change,
	.delete		= flow_delete,
	.get		= flow_get,
	.put		= flow_put,
	.dump		= flow_dump,
	.walk		= flow_walk,
	.owner		= THIS_MODULE,
};

static int __init cls_flow_init(void)
{
	return register_tcf_proto_ops(&cls_flow_ops);
}

static void __exit cls_flow_exit(void)
{
	unregister_tcf_proto_ops(&cls_flow_ops);
}

module_init(cls_flow_init);
module_exit(cls_flow_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_DESCRIPTION("TC flow classifier");
Commit	Line	Data
e5dfb815 PM	1	/*
	2	* net/sched/cls_flow.c Generic flow classifier
	3	*
	4	* Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version 2
	9	* of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/list.h>
	15	#include <linux/jhash.h>
	16	#include <linux/random.h>
	17	#include <linux/pkt_cls.h>
	18	#include <linux/skbuff.h>
	19	#include <linux/in.h>
	20	#include <linux/ip.h>
	21	#include <linux/ipv6.h>
9ec13810	22	#include <linux/if_vlan.h>
5a0e3ad6	23	#include <linux/slab.h>
e5dfb815 PM	24
	25	#include <net/pkt_cls.h>
	26	#include <net/ip.h>
	27	#include <net/route.h>
	28	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	29	#include <net/netfilter/nf_conntrack.h>
	30	#endif
	31
	32	struct flow_head {
	33	struct list_head filters;
	34	};
	35
	36	struct flow_filter {
	37	struct list_head list;
	38	struct tcf_exts exts;
	39	struct tcf_ematch_tree ematches;
72d9794f PM	40	struct timer_list perturb_timer;
72d9794f PM	41	u32 perturb_period;
e5dfb815 PM	42	u32 handle;
	43
	44	u32 nkeys;
	45	u32 keymask;
	46	u32 mode;
	47	u32 mask;
	48	u32 xor;
	49	u32 rshift;
	50	u32 addend;
	51	u32 divisor;
	52	u32 baseclass;
72d9794f	53	u32 hashrnd;
e5dfb815 PM	54	};
e5dfb815 PM	55
e5dfb815 PM	56	static const struct tcf_ext_map flow_ext_map = {
	57	.action = TCA_FLOW_ACT,
	58	.police = TCA_FLOW_POLICE,
	59	};
	60
	61	static inline u32 addr_fold(void *addr)
	62	{
	63	unsigned long a = (unsigned long)addr;
	64
	65	return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
	66	}
	67
4b95c3d4	68	static u32 flow_get_src(struct sk_buff *skb)
e5dfb815 PM	69	{
e5dfb815 PM	70	switch (skb->protocol) {
60678040	71	case htons(ETH_P_IP):
4b95c3d4 CG	72	if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
	73	return ntohl(ip_hdr(skb)->saddr);
	74	break;
60678040	75	case htons(ETH_P_IPV6):
4b95c3d4 CG	76	if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
	77	return ntohl(ipv6_hdr(skb)->saddr.s6_addr32[3]);
	78	break;
e5dfb815	79	}
4b95c3d4 CG	80
4b95c3d4 CG	81	return addr_fold(skb->sk);
e5dfb815 PM	82	}
e5dfb815 PM	83
4b95c3d4	84	static u32 flow_get_dst(struct sk_buff *skb)
e5dfb815 PM	85	{
e5dfb815 PM	86	switch (skb->protocol) {
60678040	87	case htons(ETH_P_IP):
4b95c3d4 CG	88	if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
	89	return ntohl(ip_hdr(skb)->daddr);
	90	break;
60678040	91	case htons(ETH_P_IPV6):
4b95c3d4 CG	92	if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
	93	return ntohl(ipv6_hdr(skb)->daddr.s6_addr32[3]);
	94	break;
e5dfb815	95	}
4b95c3d4 CG	96
4b95c3d4 CG	97	return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
e5dfb815 PM	98	}
e5dfb815 PM	99
4b95c3d4	100	static u32 flow_get_proto(struct sk_buff *skb)
e5dfb815 PM	101	{
e5dfb815 PM	102	switch (skb->protocol) {
60678040	103	case htons(ETH_P_IP):
4b95c3d4 CG	104	return pskb_network_may_pull(skb, sizeof(struct iphdr)) ?
4b95c3d4 CG	105	ip_hdr(skb)->protocol : 0;
60678040	106	case htons(ETH_P_IPV6):
4b95c3d4 CG	107	return pskb_network_may_pull(skb, sizeof(struct ipv6hdr)) ?
4b95c3d4 CG	108	ipv6_hdr(skb)->nexthdr : 0;
e5dfb815 PM	109	default:
	110	return 0;
	111	}
	112	}
	113
	114	static int has_ports(u8 protocol)
	115	{
	116	switch (protocol) {
	117	case IPPROTO_TCP:
	118	case IPPROTO_UDP:
	119	case IPPROTO_UDPLITE:
	120	case IPPROTO_SCTP:
	121	case IPPROTO_DCCP:
	122	case IPPROTO_ESP:
	123	return 1;
	124	default:
	125	return 0;
	126	}
	127	}
	128
4b95c3d4	129	static u32 flow_get_proto_src(struct sk_buff *skb)
e5dfb815	130	{
e5dfb815	131	switch (skb->protocol) {
60678040	132	case htons(ETH_P_IP): {
4b95c3d4	133	struct iphdr *iph;
e5dfb815	134
4b95c3d4 CG	135	if (!pskb_network_may_pull(skb, sizeof(*iph)))
	136	break;
	137	iph = ip_hdr(skb);
e5dfb815	138	if (!(iph->frag_off&htons(IP_MF\|IP_OFFSET)) &&
4b95c3d4 CG	139	has_ports(iph->protocol) &&
	140	pskb_network_may_pull(skb, iph->ihl * 4 + 2))
	141	return ntohs((__be16 )((void )iph + iph->ihl 4));
e5dfb815 PM	142	break;
e5dfb815 PM	143	}
60678040	144	case htons(ETH_P_IPV6): {
4b95c3d4	145	struct ipv6hdr *iph;
e5dfb815	146
4b95c3d4 CG	147	if (!pskb_network_may_pull(skb, sizeof(*iph) + 2))
	148	break;
	149	iph = ipv6_hdr(skb);
e5dfb815	150	if (has_ports(iph->nexthdr))
4b95c3d4	151	return ntohs((__be16 )&iph[1]);
e5dfb815 PM	152	break;
e5dfb815 PM	153	}
e5dfb815 PM	154	}
e5dfb815 PM	155
4b95c3d4	156	return addr_fold(skb->sk);
e5dfb815 PM	157	}
e5dfb815 PM	158
4b95c3d4	159	static u32 flow_get_proto_dst(struct sk_buff *skb)
e5dfb815	160	{
e5dfb815	161	switch (skb->protocol) {
60678040	162	case htons(ETH_P_IP): {
4b95c3d4	163	struct iphdr *iph;
e5dfb815	164
4b95c3d4 CG	165	if (!pskb_network_may_pull(skb, sizeof(*iph)))
	166	break;
	167	iph = ip_hdr(skb);
e5dfb815	168	if (!(iph->frag_off&htons(IP_MF\|IP_OFFSET)) &&
4b95c3d4 CG	169	has_ports(iph->protocol) &&
	170	pskb_network_may_pull(skb, iph->ihl * 4 + 4))
	171	return ntohs((__be16 )((void )iph + iph->ihl 4 + 2));
e5dfb815 PM	172	break;
e5dfb815 PM	173	}
60678040	174	case htons(ETH_P_IPV6): {
4b95c3d4	175	struct ipv6hdr *iph;
e5dfb815	176
4b95c3d4 CG	177	if (!pskb_network_may_pull(skb, sizeof(*iph) + 4))
	178	break;
	179	iph = ipv6_hdr(skb);
e5dfb815	180	if (has_ports(iph->nexthdr))
4b95c3d4	181	return ntohs((__be16 )((void *)&iph[1] + 2));
e5dfb815 PM	182	break;
e5dfb815 PM	183	}
e5dfb815 PM	184	}
e5dfb815 PM	185
4b95c3d4	186	return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
e5dfb815 PM	187	}
	188
	189	static u32 flow_get_iif(const struct sk_buff *skb)
	190	{
8964be4a	191	return skb->skb_iif;
e5dfb815 PM	192	}
	193
	194	static u32 flow_get_priority(const struct sk_buff *skb)
	195	{
	196	return skb->priority;
	197	}
	198
	199	static u32 flow_get_mark(const struct sk_buff *skb)
	200	{
	201	return skb->mark;
	202	}
	203
	204	static u32 flow_get_nfct(const struct sk_buff *skb)
	205	{
	206	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	207	return addr_fold(skb->nfct);
	208	#else
	209	return 0;
	210	#endif
	211	}
	212
	213	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	214	#define CTTUPLE(skb, member) \
	215	({ \
	216	enum ip_conntrack_info ctinfo; \
	217	struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
	218	if (ct == NULL) \
	219	goto fallback; \
	220	ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
	221	})
	222	#else
	223	#define CTTUPLE(skb, member) \
	224	({ \
	225	goto fallback; \
	226	0; \
	227	})
	228	#endif
	229
4b95c3d4	230	static u32 flow_get_nfct_src(struct sk_buff *skb)
e5dfb815 PM	231	{
e5dfb815 PM	232	switch (skb->protocol) {
60678040	233	case htons(ETH_P_IP):
e5dfb815	234	return ntohl(CTTUPLE(skb, src.u3.ip));
60678040	235	case htons(ETH_P_IPV6):
e5dfb815 PM	236	return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
	237	}
	238	fallback:
	239	return flow_get_src(skb);
	240	}
	241
4b95c3d4	242	static u32 flow_get_nfct_dst(struct sk_buff *skb)
e5dfb815 PM	243	{
e5dfb815 PM	244	switch (skb->protocol) {
60678040	245	case htons(ETH_P_IP):
e5dfb815	246	return ntohl(CTTUPLE(skb, dst.u3.ip));
60678040	247	case htons(ETH_P_IPV6):
e5dfb815 PM	248	return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
	249	}
	250	fallback:
	251	return flow_get_dst(skb);
	252	}
	253
4b95c3d4	254	static u32 flow_get_nfct_proto_src(struct sk_buff *skb)
e5dfb815 PM	255	{
	256	return ntohs(CTTUPLE(skb, src.u.all));
	257	fallback:
	258	return flow_get_proto_src(skb);
	259	}
	260
4b95c3d4	261	static u32 flow_get_nfct_proto_dst(struct sk_buff *skb)
e5dfb815 PM	262	{
	263	return ntohs(CTTUPLE(skb, dst.u.all));
	264	fallback:
	265	return flow_get_proto_dst(skb);
	266	}
	267
	268	static u32 flow_get_rtclassid(const struct sk_buff *skb)
	269	{
	270	#ifdef CONFIG_NET_CLS_ROUTE
adf30907 ED	271	if (skb_dst(skb))
adf30907 ED	272	return skb_dst(skb)->tclassid;
e5dfb815 PM	273	#endif
	274	return 0;
	275	}
	276
	277	static u32 flow_get_skuid(const struct sk_buff *skb)
	278	{
	279	if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
d76b0d9b	280	return skb->sk->sk_socket->file->f_cred->fsuid;
e5dfb815 PM	281	return 0;
	282	}
	283
	284	static u32 flow_get_skgid(const struct sk_buff *skb)
	285	{
	286	if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
d76b0d9b	287	return skb->sk->sk_socket->file->f_cred->fsgid;
e5dfb815 PM	288	return 0;
	289	}
	290
9ec13810 PM	291	static u32 flow_get_vlan_tag(const struct sk_buff *skb)
	292	{
	293	u16 uninitialized_var(tag);
	294
	295	if (vlan_get_tag(skb, &tag) < 0)
	296	return 0;
	297	return tag & VLAN_VID_MASK;
	298	}
	299
4b95c3d4	300	static u32 flow_key_get(struct sk_buff *skb, int key)
e5dfb815 PM	301	{
	302	switch (key) {
	303	case FLOW_KEY_SRC:
	304	return flow_get_src(skb);
	305	case FLOW_KEY_DST:
	306	return flow_get_dst(skb);
	307	case FLOW_KEY_PROTO:
	308	return flow_get_proto(skb);
	309	case FLOW_KEY_PROTO_SRC:
	310	return flow_get_proto_src(skb);
	311	case FLOW_KEY_PROTO_DST:
	312	return flow_get_proto_dst(skb);
	313	case FLOW_KEY_IIF:
	314	return flow_get_iif(skb);
	315	case FLOW_KEY_PRIORITY:
	316	return flow_get_priority(skb);
	317	case FLOW_KEY_MARK:
	318	return flow_get_mark(skb);
	319	case FLOW_KEY_NFCT:
	320	return flow_get_nfct(skb);
	321	case FLOW_KEY_NFCT_SRC:
	322	return flow_get_nfct_src(skb);
	323	case FLOW_KEY_NFCT_DST:
	324	return flow_get_nfct_dst(skb);
	325	case FLOW_KEY_NFCT_PROTO_SRC:
	326	return flow_get_nfct_proto_src(skb);
	327	case FLOW_KEY_NFCT_PROTO_DST:
	328	return flow_get_nfct_proto_dst(skb);
	329	case FLOW_KEY_RTCLASSID:
	330	return flow_get_rtclassid(skb);
	331	case FLOW_KEY_SKUID:
	332	return flow_get_skuid(skb);
	333	case FLOW_KEY_SKGID:
	334	return flow_get_skgid(skb);
9ec13810 PM	335	case FLOW_KEY_VLAN_TAG:
9ec13810 PM	336	return flow_get_vlan_tag(skb);
e5dfb815 PM	337	default:
	338	WARN_ON(1);
	339	return 0;
	340	}
	341	}
	342
	343	static int flow_classify(struct sk_buff skb, struct tcf_proto tp,
	344	struct tcf_result *res)
	345	{
	346	struct flow_head *head = tp->root;
	347	struct flow_filter *f;
	348	u32 keymask;
	349	u32 classid;
	350	unsigned int n, key;
	351	int r;
	352
	353	list_for_each_entry(f, &head->filters, list) {
	354	u32 keys[f->nkeys];
	355
	356	if (!tcf_em_tree_match(skb, &f->ematches, NULL))
	357	continue;
	358
	359	keymask = f->keymask;
	360
	361	for (n = 0; n < f->nkeys; n++) {
	362	key = ffs(keymask) - 1;
	363	keymask &= ~(1 << key);
	364	keys[n] = flow_key_get(skb, key);
	365	}
	366
	367	if (f->mode == FLOW_MODE_HASH)
72d9794f	368	classid = jhash2(keys, f->nkeys, f->hashrnd);
e5dfb815 PM	369	else {
	370	classid = keys[0];
	371	classid = (classid & f->mask) ^ f->xor;
	372	classid = (classid >> f->rshift) + f->addend;
	373	}
	374
	375	if (f->divisor)
	376	classid %= f->divisor;
	377
	378	res->class = 0;
	379	res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
	380
	381	r = tcf_exts_exec(skb, &f->exts, res);
	382	if (r < 0)
	383	continue;
	384	return r;
	385	}
	386	return -1;
	387	}
	388
72d9794f PM	389	static void flow_perturbation(unsigned long arg)
	390	{
	391	struct flow_filter f = (struct flow_filter )arg;
	392
	393	get_random_bytes(&f->hashrnd, 4);
	394	if (f->perturb_period)
	395	mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
	396	}
	397
e5dfb815 PM	398	static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
	399	[TCA_FLOW_KEYS] = { .type = NLA_U32 },
	400	[TCA_FLOW_MODE] = { .type = NLA_U32 },
	401	[TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
	402	[TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
	403	[TCA_FLOW_ADDEND] = { .type = NLA_U32 },
	404	[TCA_FLOW_MASK] = { .type = NLA_U32 },
	405	[TCA_FLOW_XOR] = { .type = NLA_U32 },
	406	[TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
	407	[TCA_FLOW_ACT] = { .type = NLA_NESTED },
	408	[TCA_FLOW_POLICE] = { .type = NLA_NESTED },
	409	[TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
72d9794f	410	[TCA_FLOW_PERTURB] = { .type = NLA_U32 },
e5dfb815 PM	411	};
	412
	413	static int flow_change(struct tcf_proto *tp, unsigned long base,
	414	u32 handle, struct nlattr **tca,
	415	unsigned long *arg)
	416	{
	417	struct flow_head *head = tp->root;
	418	struct flow_filter *f;
	419	struct nlattr *opt = tca[TCA_OPTIONS];
	420	struct nlattr *tb[TCA_FLOW_MAX + 1];
	421	struct tcf_exts e;
	422	struct tcf_ematch_tree t;
	423	unsigned int nkeys = 0;
72d9794f	424	unsigned int perturb_period = 0;
e5dfb815 PM	425	u32 baseclass = 0;
	426	u32 keymask = 0;
	427	u32 mode;
	428	int err;
	429
	430	if (opt == NULL)
	431	return -EINVAL;
	432
	433	err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
	434	if (err < 0)
	435	return err;
	436
	437	if (tb[TCA_FLOW_BASECLASS]) {
	438	baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
	439	if (TC_H_MIN(baseclass) == 0)
	440	return -EINVAL;
	441	}
	442
	443	if (tb[TCA_FLOW_KEYS]) {
	444	keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
e5dfb815 PM	445
	446	nkeys = hweight32(keymask);
	447	if (nkeys == 0)
	448	return -EINVAL;
4f250491 PM	449
	450	if (fls(keymask) - 1 > FLOW_KEY_MAX)
	451	return -EOPNOTSUPP;
e5dfb815 PM	452	}
	453
	454	err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &flow_ext_map);
	455	if (err < 0)
	456	return err;
	457
	458	err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
	459	if (err < 0)
	460	goto err1;
	461
	462	f = (struct flow_filter )arg;
	463	if (f != NULL) {
	464	err = -EINVAL;
	465	if (f->handle != handle && handle)
	466	goto err2;
	467
	468	mode = f->mode;
	469	if (tb[TCA_FLOW_MODE])
	470	mode = nla_get_u32(tb[TCA_FLOW_MODE]);
	471	if (mode != FLOW_MODE_HASH && nkeys > 1)
	472	goto err2;
72d9794f PM	473
	474	if (mode == FLOW_MODE_HASH)
	475	perturb_period = f->perturb_period;
	476	if (tb[TCA_FLOW_PERTURB]) {
	477	if (mode != FLOW_MODE_HASH)
	478	goto err2;
	479	perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
	480	}
e5dfb815 PM	481	} else {
	482	err = -EINVAL;
	483	if (!handle)
	484	goto err2;
	485	if (!tb[TCA_FLOW_KEYS])
	486	goto err2;
	487
	488	mode = FLOW_MODE_MAP;
	489	if (tb[TCA_FLOW_MODE])
	490	mode = nla_get_u32(tb[TCA_FLOW_MODE]);
	491	if (mode != FLOW_MODE_HASH && nkeys > 1)
	492	goto err2;
	493
72d9794f PM	494	if (tb[TCA_FLOW_PERTURB]) {
	495	if (mode != FLOW_MODE_HASH)
	496	goto err2;
	497	perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
	498	}
	499
e5dfb815 PM	500	if (TC_H_MAJ(baseclass) == 0)
	501	baseclass = TC_H_MAKE(tp->q->handle, baseclass);
	502	if (TC_H_MIN(baseclass) == 0)
	503	baseclass = TC_H_MAKE(baseclass, 1);
	504
	505	err = -ENOBUFS;
	506	f = kzalloc(sizeof(*f), GFP_KERNEL);
	507	if (f == NULL)
	508	goto err2;
	509
	510	f->handle = handle;
	511	f->mask = ~0U;
72d9794f PM	512
	513	get_random_bytes(&f->hashrnd, 4);
	514	f->perturb_timer.function = flow_perturbation;
	515	f->perturb_timer.data = (unsigned long)f;
	516	init_timer_deferrable(&f->perturb_timer);
e5dfb815 PM	517	}
	518
	519	tcf_exts_change(tp, &f->exts, &e);
	520	tcf_em_tree_change(tp, &f->ematches, &t);
	521
	522	tcf_tree_lock(tp);
	523
	524	if (tb[TCA_FLOW_KEYS]) {
	525	f->keymask = keymask;
	526	f->nkeys = nkeys;
	527	}
	528
	529	f->mode = mode;
	530
	531	if (tb[TCA_FLOW_MASK])
	532	f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
	533	if (tb[TCA_FLOW_XOR])
	534	f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
	535	if (tb[TCA_FLOW_RSHIFT])
	536	f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
	537	if (tb[TCA_FLOW_ADDEND])
	538	f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
	539
	540	if (tb[TCA_FLOW_DIVISOR])
	541	f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
	542	if (baseclass)
	543	f->baseclass = baseclass;
	544
72d9794f PM	545	f->perturb_period = perturb_period;
	546	del_timer(&f->perturb_timer);
	547	if (perturb_period)
	548	mod_timer(&f->perturb_timer, jiffies + perturb_period);
	549
e5dfb815 PM	550	if (*arg == 0)
	551	list_add_tail(&f->list, &head->filters);
	552
	553	tcf_tree_unlock(tp);
	554
	555	*arg = (unsigned long)f;
	556	return 0;
	557
	558	err2:
	559	tcf_em_tree_destroy(tp, &t);
	560	err1:
	561	tcf_exts_destroy(tp, &e);
	562	return err;
	563	}
	564
	565	static void flow_destroy_filter(struct tcf_proto tp, struct flow_filter f)
	566	{
72d9794f	567	del_timer_sync(&f->perturb_timer);
e5dfb815 PM	568	tcf_exts_destroy(tp, &f->exts);
	569	tcf_em_tree_destroy(tp, &f->ematches);
	570	kfree(f);
	571	}
	572
	573	static int flow_delete(struct tcf_proto *tp, unsigned long arg)
	574	{
	575	struct flow_filter f = (struct flow_filter )arg;
	576
	577	tcf_tree_lock(tp);
	578	list_del(&f->list);
	579	tcf_tree_unlock(tp);
	580	flow_destroy_filter(tp, f);
	581	return 0;
	582	}
	583
	584	static int flow_init(struct tcf_proto *tp)
	585	{
	586	struct flow_head *head;
	587
e5dfb815 PM	588	head = kzalloc(sizeof(*head), GFP_KERNEL);
	589	if (head == NULL)
	590	return -ENOBUFS;
	591	INIT_LIST_HEAD(&head->filters);
	592	tp->root = head;
	593	return 0;
	594	}
	595
	596	static void flow_destroy(struct tcf_proto *tp)
	597	{
	598	struct flow_head *head = tp->root;
	599	struct flow_filter f, next;
	600
	601	list_for_each_entry_safe(f, next, &head->filters, list) {
	602	list_del(&f->list);
	603	flow_destroy_filter(tp, f);
	604	}
	605	kfree(head);
	606	}
	607
	608	static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
	609	{
	610	struct flow_head *head = tp->root;
	611	struct flow_filter *f;
	612
	613	list_for_each_entry(f, &head->filters, list)
	614	if (f->handle == handle)
	615	return (unsigned long)f;
	616	return 0;
	617	}
	618
	619	static void flow_put(struct tcf_proto *tp, unsigned long f)
	620	{
e5dfb815 PM	621	}
	622
	623	static int flow_dump(struct tcf_proto *tp, unsigned long fh,
	624	struct sk_buff skb, struct tcmsg t)
	625	{
	626	struct flow_filter f = (struct flow_filter )fh;
	627	struct nlattr *nest;
	628
	629	if (f == NULL)
	630	return skb->len;
	631
	632	t->tcm_handle = f->handle;
	633
	634	nest = nla_nest_start(skb, TCA_OPTIONS);
	635	if (nest == NULL)
	636	goto nla_put_failure;
	637
	638	NLA_PUT_U32(skb, TCA_FLOW_KEYS, f->keymask);
	639	NLA_PUT_U32(skb, TCA_FLOW_MODE, f->mode);
	640
	641	if (f->mask != ~0 \|\| f->xor != 0) {
	642	NLA_PUT_U32(skb, TCA_FLOW_MASK, f->mask);
	643	NLA_PUT_U32(skb, TCA_FLOW_XOR, f->xor);
	644	}
	645	if (f->rshift)
	646	NLA_PUT_U32(skb, TCA_FLOW_RSHIFT, f->rshift);
	647	if (f->addend)
	648	NLA_PUT_U32(skb, TCA_FLOW_ADDEND, f->addend);
	649
	650	if (f->divisor)
	651	NLA_PUT_U32(skb, TCA_FLOW_DIVISOR, f->divisor);
	652	if (f->baseclass)
	653	NLA_PUT_U32(skb, TCA_FLOW_BASECLASS, f->baseclass);
	654
72d9794f PM	655	if (f->perturb_period)
	656	NLA_PUT_U32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ);
	657
e5dfb815 PM	658	if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0)
e5dfb815 PM	659	goto nla_put_failure;
0aead543	660	#ifdef CONFIG_NET_EMATCH
e5dfb815 PM	661	if (f->ematches.hdr.nmatches &&
	662	tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
	663	goto nla_put_failure;
0aead543	664	#endif
e5dfb815 PM	665	nla_nest_end(skb, nest);
	666
	667	if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0)
	668	goto nla_put_failure;
	669
	670	return skb->len;
	671
	672	nla_put_failure:
	673	nlmsg_trim(skb, nest);
	674	return -1;
	675	}
	676
	677	static void flow_walk(struct tcf_proto tp, struct tcf_walker arg)
	678	{
	679	struct flow_head *head = tp->root;
	680	struct flow_filter *f;
	681
	682	list_for_each_entry(f, &head->filters, list) {
	683	if (arg->count < arg->skip)
	684	goto skip;
	685	if (arg->fn(tp, (unsigned long)f, arg) < 0) {
	686	arg->stop = 1;
	687	break;
	688	}
	689	skip:
	690	arg->count++;
	691	}
	692	}
	693
	694	static struct tcf_proto_ops cls_flow_ops __read_mostly = {
	695	.kind = "flow",
	696	.classify = flow_classify,
	697	.init = flow_init,
	698	.destroy = flow_destroy,
	699	.change = flow_change,
	700	.delete = flow_delete,
	701	.get = flow_get,
	702	.put = flow_put,
	703	.dump = flow_dump,
	704	.walk = flow_walk,
	705	.owner = THIS_MODULE,
	706	};
	707
	708	static int __init cls_flow_init(void)
	709	{
	710	return register_tcf_proto_ops(&cls_flow_ops);
	711	}
	712
	713	static void __exit cls_flow_exit(void)
	714	{
	715	unregister_tcf_proto_ops(&cls_flow_ops);
	716	}
	717
	718	module_init(cls_flow_init);
	719	module_exit(cls_flow_exit);
	720
	721	MODULE_LICENSE("GPL");
	722	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	723	MODULE_DESCRIPTION("TC flow classifier");