[linux-2.6-block.git] / net / ipv6 / ip6_flowlabel.c

/*
 *	ip6_flowlabel.c		IPv6 flowlabel manager.
 *
 *	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/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/route.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include <net/net_namespace.h>
#include <net/sock.h>

#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/protocol.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/rawv6.h>
#include <net/icmp.h>
#include <net/transp_v6.h>

#include <asm/uaccess.h>

#define FL_MIN_LINGER	6	/* Minimal linger. It is set to 6sec specified
				   in old IPv6 RFC. Well, it was reasonable value.
				 */
#define FL_MAX_LINGER	60	/* Maximal linger timeout */

/* FL hash table */

#define FL_MAX_PER_SOCK	32
#define FL_MAX_SIZE	4096
#define FL_HASH_MASK	255
#define FL_HASH(l)	(ntohl(l)&FL_HASH_MASK)

static atomic_t fl_size = ATOMIC_INIT(0);
static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];

static void ip6_fl_gc(unsigned long dummy);
static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);

/* FL hash table lock: it protects only of GC */

static DEFINE_RWLOCK(ip6_fl_lock);

/* Big socket sock */

static DEFINE_RWLOCK(ip6_sk_fl_lock);


static __inline__ struct ip6_flowlabel * __fl_lookup(__be32 label)
{
	struct ip6_flowlabel *fl;

	for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
		if (fl->label == label)
			return fl;
	}
	return NULL;
}

static struct ip6_flowlabel * fl_lookup(__be32 label)
{
	struct ip6_flowlabel *fl;

	read_lock_bh(&ip6_fl_lock);
	fl = __fl_lookup(label);
	if (fl)
		atomic_inc(&fl->users);
	read_unlock_bh(&ip6_fl_lock);
	return fl;
}


static void fl_free(struct ip6_flowlabel *fl)
{
	if (fl)
		kfree(fl->opt);
	kfree(fl);
}

static void fl_release(struct ip6_flowlabel *fl)
{
	write_lock_bh(&ip6_fl_lock);

	fl->lastuse = jiffies;
	if (atomic_dec_and_test(&fl->users)) {
		unsigned long ttd = fl->lastuse + fl->linger;
		if (time_after(ttd, fl->expires))
			fl->expires = ttd;
		ttd = fl->expires;
		if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
			struct ipv6_txoptions *opt = fl->opt;
			fl->opt = NULL;
			kfree(opt);
		}
		if (!timer_pending(&ip6_fl_gc_timer) ||
		    time_after(ip6_fl_gc_timer.expires, ttd))
			mod_timer(&ip6_fl_gc_timer, ttd);
	}

	write_unlock_bh(&ip6_fl_lock);
}

static void ip6_fl_gc(unsigned long dummy)
{
	int i;
	unsigned long now = jiffies;
	unsigned long sched = 0;

	write_lock(&ip6_fl_lock);

	for (i=0; i<=FL_HASH_MASK; i++) {
		struct ip6_flowlabel *fl, **flp;
		flp = &fl_ht[i];
		while ((fl=*flp) != NULL) {
			if (atomic_read(&fl->users) == 0) {
				unsigned long ttd = fl->lastuse + fl->linger;
				if (time_after(ttd, fl->expires))
					fl->expires = ttd;
				ttd = fl->expires;
				if (time_after_eq(now, ttd)) {
					*flp = fl->next;
					fl_free(fl);
					atomic_dec(&fl_size);
					continue;
				}
				if (!sched || time_before(ttd, sched))
					sched = ttd;
			}
			flp = &fl->next;
		}
	}
	if (!sched && atomic_read(&fl_size))
		sched = now + FL_MAX_LINGER;
	if (sched) {
		ip6_fl_gc_timer.expires = sched;
		add_timer(&ip6_fl_gc_timer);
	}
	write_unlock(&ip6_fl_lock);
}

static struct ip6_flowlabel *fl_intern(struct ip6_flowlabel *fl, __be32 label)
{
	struct ip6_flowlabel *lfl;

	fl->label = label & IPV6_FLOWLABEL_MASK;

	write_lock_bh(&ip6_fl_lock);
	if (label == 0) {
		for (;;) {
			fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
			if (fl->label) {
				lfl = __fl_lookup(fl->label);
				if (lfl == NULL)
					break;
			}
		}
	} else {
		/*
		 * we dropper the ip6_fl_lock, so this entry could reappear
		 * and we need to recheck with it.
		 *
		 * OTOH no need to search the active socket first, like it is
		 * done in ipv6_flowlabel_opt - sock is locked, so new entry
		 * with the same label can only appear on another sock
		 */
		lfl = __fl_lookup(fl->label);
		if (lfl != NULL) {
			atomic_inc(&lfl->users);
			write_unlock_bh(&ip6_fl_lock);
			return lfl;
		}
	}

	fl->lastuse = jiffies;
	fl->next = fl_ht[FL_HASH(fl->label)];
	fl_ht[FL_HASH(fl->label)] = fl;
	atomic_inc(&fl_size);
	write_unlock_bh(&ip6_fl_lock);
	return NULL;
}


/* Socket flowlabel lists */

struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
{
	struct ipv6_fl_socklist *sfl;
	struct ipv6_pinfo *np = inet6_sk(sk);

	label &= IPV6_FLOWLABEL_MASK;

	read_lock_bh(&ip6_sk_fl_lock);
	for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
		struct ip6_flowlabel *fl = sfl->fl;
		if (fl->label == label) {
			fl->lastuse = jiffies;
			atomic_inc(&fl->users);
			read_unlock_bh(&ip6_sk_fl_lock);
			return fl;
		}
	}
	read_unlock_bh(&ip6_sk_fl_lock);
	return NULL;
}

EXPORT_SYMBOL_GPL(fl6_sock_lookup);

void fl6_free_socklist(struct sock *sk)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct ipv6_fl_socklist *sfl;

	while ((sfl = np->ipv6_fl_list) != NULL) {
		np->ipv6_fl_list = sfl->next;
		fl_release(sfl->fl);
		kfree(sfl);
	}
}

/* Service routines */


/*
   It is the only difficult place. flowlabel enforces equal headers
   before and including routing header, however user may supply options
   following rthdr.
 */

struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
					 struct ip6_flowlabel * fl,
					 struct ipv6_txoptions * fopt)
{
	struct ipv6_txoptions * fl_opt = fl->opt;

	if (fopt == NULL || fopt->opt_flen == 0)
		return fl_opt;

	if (fl_opt != NULL) {
		opt_space->hopopt = fl_opt->hopopt;
		opt_space->dst0opt = fl_opt->dst0opt;
		opt_space->srcrt = fl_opt->srcrt;
		opt_space->opt_nflen = fl_opt->opt_nflen;
	} else {
		if (fopt->opt_nflen == 0)
			return fopt;
		opt_space->hopopt = NULL;
		opt_space->dst0opt = NULL;
		opt_space->srcrt = NULL;
		opt_space->opt_nflen = 0;
	}
	opt_space->dst1opt = fopt->dst1opt;
	opt_space->opt_flen = fopt->opt_flen;
	return opt_space;
}

static unsigned long check_linger(unsigned long ttl)
{
	if (ttl < FL_MIN_LINGER)
		return FL_MIN_LINGER*HZ;
	if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
		return 0;
	return ttl*HZ;
}

static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
{
	linger = check_linger(linger);
	if (!linger)
		return -EPERM;
	expires = check_linger(expires);
	if (!expires)
		return -EPERM;
	fl->lastuse = jiffies;
	if (time_before(fl->linger, linger))
		fl->linger = linger;
	if (time_before(expires, fl->linger))
		expires = fl->linger;
	if (time_before(fl->expires, fl->lastuse + expires))
		fl->expires = fl->lastuse + expires;
	return 0;
}

static struct ip6_flowlabel *
fl_create(struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p)
{
	struct ip6_flowlabel *fl;
	int olen;
	int addr_type;
	int err;

	err = -ENOMEM;
	fl = kzalloc(sizeof(*fl), GFP_KERNEL);
	if (fl == NULL)
		goto done;

	olen = optlen - CMSG_ALIGN(sizeof(*freq));
	if (olen > 0) {
		struct msghdr msg;
		struct flowi flowi;
		int junk;

		err = -ENOMEM;
		fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
		if (fl->opt == NULL)
			goto done;

		memset(fl->opt, 0, sizeof(*fl->opt));
		fl->opt->tot_len = sizeof(*fl->opt) + olen;
		err = -EFAULT;
		if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
			goto done;

		msg.msg_controllen = olen;
		msg.msg_control = (void*)(fl->opt+1);
		flowi.oif = 0;

		err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk);
		if (err)
			goto done;
		err = -EINVAL;
		if (fl->opt->opt_flen)
			goto done;
		if (fl->opt->opt_nflen == 0) {
			kfree(fl->opt);
			fl->opt = NULL;
		}
	}

	fl->expires = jiffies;
	err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
	if (err)
		goto done;
	fl->share = freq->flr_share;
	addr_type = ipv6_addr_type(&freq->flr_dst);
	if ((addr_type&IPV6_ADDR_MAPPED)
	    || addr_type == IPV6_ADDR_ANY) {
		err = -EINVAL;
		goto done;
	}
	ipv6_addr_copy(&fl->dst, &freq->flr_dst);
	atomic_set(&fl->users, 1);
	switch (fl->share) {
	case IPV6_FL_S_EXCL:
	case IPV6_FL_S_ANY:
		break;
	case IPV6_FL_S_PROCESS:
		fl->owner = current->pid;
		break;
	case IPV6_FL_S_USER:
		fl->owner = current->euid;
		break;
	default:
		err = -EINVAL;
		goto done;
	}
	return fl;

done:
	fl_free(fl);
	*err_p = err;
	return NULL;
}

static int mem_check(struct sock *sk)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct ipv6_fl_socklist *sfl;
	int room = FL_MAX_SIZE - atomic_read(&fl_size);
	int count = 0;

	if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
		return 0;

	for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
		count++;

	if (room <= 0 ||
	    ((count >= FL_MAX_PER_SOCK ||
	     (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4)
	     && !capable(CAP_NET_ADMIN)))
		return -ENOBUFS;

	return 0;
}

static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
{
	if (h1 == h2)
		return 0;
	if (h1 == NULL || h2 == NULL)
		return 1;
	if (h1->hdrlen != h2->hdrlen)
		return 1;
	return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
}

static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
{
	if (o1 == o2)
		return 0;
	if (o1 == NULL || o2 == NULL)
		return 1;
	if (o1->opt_nflen != o2->opt_nflen)
		return 1;
	if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
		return 1;
	if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
		return 1;
	if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
		return 1;
	return 0;
}

static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
		struct ip6_flowlabel *fl)
{
	write_lock_bh(&ip6_sk_fl_lock);
	sfl->fl = fl;
	sfl->next = np->ipv6_fl_list;
	np->ipv6_fl_list = sfl;
	write_unlock_bh(&ip6_sk_fl_lock);
}

int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
{
	int err;
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct in6_flowlabel_req freq;
	struct ipv6_fl_socklist *sfl1=NULL;
	struct ipv6_fl_socklist *sfl, **sflp;
	struct ip6_flowlabel *fl, *fl1 = NULL;


	if (optlen < sizeof(freq))
		return -EINVAL;

	if (copy_from_user(&freq, optval, sizeof(freq)))
		return -EFAULT;

	switch (freq.flr_action) {
	case IPV6_FL_A_PUT:
		write_lock_bh(&ip6_sk_fl_lock);
		for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
			if (sfl->fl->label == freq.flr_label) {
				if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
					np->flow_label &= ~IPV6_FLOWLABEL_MASK;
				*sflp = sfl->next;
				write_unlock_bh(&ip6_sk_fl_lock);
				fl_release(sfl->fl);
				kfree(sfl);
				return 0;
			}
		}
		write_unlock_bh(&ip6_sk_fl_lock);
		return -ESRCH;

	case IPV6_FL_A_RENEW:
		read_lock_bh(&ip6_sk_fl_lock);
		for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
			if (sfl->fl->label == freq.flr_label) {
				err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
				read_unlock_bh(&ip6_sk_fl_lock);
				return err;
			}
		}
		read_unlock_bh(&ip6_sk_fl_lock);

		if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
			fl = fl_lookup(freq.flr_label);
			if (fl) {
				err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
				fl_release(fl);
				return err;
			}
		}
		return -ESRCH;

	case IPV6_FL_A_GET:
		if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
			return -EINVAL;

		fl = fl_create(&freq, optval, optlen, &err);
		if (fl == NULL)
			return err;
		sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);

		if (freq.flr_label) {
			err = -EEXIST;
			read_lock_bh(&ip6_sk_fl_lock);
			for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
				if (sfl->fl->label == freq.flr_label) {
					if (freq.flr_flags&IPV6_FL_F_EXCL) {
						read_unlock_bh(&ip6_sk_fl_lock);
						goto done;
					}
					fl1 = sfl->fl;
					atomic_inc(&fl1->users);
					break;
				}
			}
			read_unlock_bh(&ip6_sk_fl_lock);

			if (fl1 == NULL)
				fl1 = fl_lookup(freq.flr_label);
			if (fl1) {
recheck:
				err = -EEXIST;
				if (freq.flr_flags&IPV6_FL_F_EXCL)
					goto release;
				err = -EPERM;
				if (fl1->share == IPV6_FL_S_EXCL ||
				    fl1->share != fl->share ||
				    fl1->owner != fl->owner)
					goto release;

				err = -EINVAL;
				if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
				    ipv6_opt_cmp(fl1->opt, fl->opt))
					goto release;

				err = -ENOMEM;
				if (sfl1 == NULL)
					goto release;
				if (fl->linger > fl1->linger)
					fl1->linger = fl->linger;
				if ((long)(fl->expires - fl1->expires) > 0)
					fl1->expires = fl->expires;
				fl_link(np, sfl1, fl1);
				fl_free(fl);
				return 0;

release:
				fl_release(fl1);
				goto done;
			}
		}
		err = -ENOENT;
		if (!(freq.flr_flags&IPV6_FL_F_CREATE))
			goto done;

		err = -ENOMEM;
		if (sfl1 == NULL || (err = mem_check(sk)) != 0)
			goto done;

		fl1 = fl_intern(fl, freq.flr_label);
		if (fl1 != NULL)
			goto recheck;

		if (!freq.flr_label) {
			if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
					 &fl->label, sizeof(fl->label))) {
				/* Intentionally ignore fault. */
			}
		}

		fl_link(np, sfl1, fl);
		return 0;

	default:
		return -EINVAL;
	}

done:
	fl_free(fl);
	kfree(sfl1);
	return err;
}

#ifdef CONFIG_PROC_FS

struct ip6fl_iter_state {
	int bucket;
};

#define ip6fl_seq_private(seq)	((struct ip6fl_iter_state *)(seq)->private)

static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
{
	struct ip6_flowlabel *fl = NULL;
	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);

	for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
		if (fl_ht[state->bucket]) {
			fl = fl_ht[state->bucket];
			break;
		}
	}
	return fl;
}

static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
{
	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);

	fl = fl->next;
	while (!fl) {
		if (++state->bucket <= FL_HASH_MASK)
			fl = fl_ht[state->bucket];
		else
			break;
	}
	return fl;
}

static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ip6_flowlabel *fl = ip6fl_get_first(seq);
	if (fl)
		while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
			--pos;
	return pos ? NULL : fl;
}

static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
{
	read_lock_bh(&ip6_fl_lock);
	return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ip6_flowlabel *fl;

	if (v == SEQ_START_TOKEN)
		fl = ip6fl_get_first(seq);
	else
		fl = ip6fl_get_next(seq, v);
	++*pos;
	return fl;
}

static void ip6fl_seq_stop(struct seq_file *seq, void *v)
{
	read_unlock_bh(&ip6_fl_lock);
}

static int ip6fl_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
			   "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
	else {
		struct ip6_flowlabel *fl = v;
		seq_printf(seq,
			   "%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n",
			   (unsigned)ntohl(fl->label),
			   fl->share,
			   (unsigned)fl->owner,
			   atomic_read(&fl->users),
			   fl->linger/HZ,
			   (long)(fl->expires - jiffies)/HZ,
			   NIP6(fl->dst),
			   fl->opt ? fl->opt->opt_nflen : 0);
	}
	return 0;
}

static const struct seq_operations ip6fl_seq_ops = {
	.start	=	ip6fl_seq_start,
	.next	=	ip6fl_seq_next,
	.stop	=	ip6fl_seq_stop,
	.show	=	ip6fl_seq_show,
};

static int ip6fl_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_private(file, &ip6fl_seq_ops,
			sizeof(struct ip6fl_iter_state));
}

static const struct file_operations ip6fl_seq_fops = {
	.owner		=	THIS_MODULE,
	.open		=	ip6fl_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
	.release	=	seq_release_private,
};

static int ip6_flowlabel_proc_init(struct net *net)
{
	if (!proc_net_fops_create(net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops))
		return -ENOMEM;
	return 0;
}

static void ip6_flowlabel_proc_fini(struct net *net)
{
	proc_net_remove(net, "ip6_flowlabel");
}
#else
static inline int ip6_flowlabel_proc_init(struct net *net)
{
	return 0;
}
static inline void ip6_flowlabel_proc_fini(struct net *net)
{
	return ;
}
#endif

int ip6_flowlabel_init(void)
{
	return ip6_flowlabel_proc_init(&init_net);
}

void ip6_flowlabel_cleanup(void)
{
	del_timer(&ip6_fl_gc_timer);
	ip6_flowlabel_proc_fini(&init_net);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ip6_flowlabel.c IPv6 flowlabel manager.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	10	*/
	11
4fc268d2	12	#include <linux/capability.h>
1da177e4 LT	13	#include <linux/errno.h>
	14	#include <linux/types.h>
	15	#include <linux/socket.h>
	16	#include <linux/net.h>
	17	#include <linux/netdevice.h>
	18	#include <linux/if_arp.h>
	19	#include <linux/in6.h>
	20	#include <linux/route.h>
	21	#include <linux/proc_fs.h>
	22	#include <linux/seq_file.h>
	23
457c4cbc	24	#include <net/net_namespace.h>
1da177e4 LT	25	#include <net/sock.h>
	26
	27	#include <net/ipv6.h>
	28	#include <net/ndisc.h>
	29	#include <net/protocol.h>
	30	#include <net/ip6_route.h>
	31	#include <net/addrconf.h>
	32	#include <net/rawv6.h>
	33	#include <net/icmp.h>
	34	#include <net/transp_v6.h>
	35
	36	#include <asm/uaccess.h>
	37
	38	#define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
	39	in old IPv6 RFC. Well, it was reasonable value.
	40	*/
	41	#define FL_MAX_LINGER 60 /* Maximal linger timeout */
	42
	43	/* FL hash table */
	44
	45	#define FL_MAX_PER_SOCK 32
	46	#define FL_MAX_SIZE 4096
	47	#define FL_HASH_MASK 255
	48	#define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
	49
	50	static atomic_t fl_size = ATOMIC_INIT(0);
	51	static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
	52
	53	static void ip6_fl_gc(unsigned long dummy);
8d06afab	54	static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
1da177e4 LT	55
	56	/* FL hash table lock: it protects only of GC */
	57
	58	static DEFINE_RWLOCK(ip6_fl_lock);
	59
	60	/* Big socket sock */
	61
	62	static DEFINE_RWLOCK(ip6_sk_fl_lock);
	63
	64
90bcaf7b	65	static __inline__ struct ip6_flowlabel * __fl_lookup(__be32 label)
1da177e4 LT	66	{
	67	struct ip6_flowlabel *fl;
	68
	69	for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
	70	if (fl->label == label)
	71	return fl;
	72	}
	73	return NULL;
	74	}
	75
90bcaf7b	76	static struct ip6_flowlabel * fl_lookup(__be32 label)
1da177e4 LT	77	{
	78	struct ip6_flowlabel *fl;
	79
	80	read_lock_bh(&ip6_fl_lock);
	81	fl = __fl_lookup(label);
	82	if (fl)
	83	atomic_inc(&fl->users);
	84	read_unlock_bh(&ip6_fl_lock);
	85	return fl;
	86	}
	87
	88
	89	static void fl_free(struct ip6_flowlabel *fl)
	90	{
	91	if (fl)
	92	kfree(fl->opt);
	93	kfree(fl);
	94	}
	95
	96	static void fl_release(struct ip6_flowlabel *fl)
	97	{
	98	write_lock_bh(&ip6_fl_lock);
	99
	100	fl->lastuse = jiffies;
	101	if (atomic_dec_and_test(&fl->users)) {
	102	unsigned long ttd = fl->lastuse + fl->linger;
	103	if (time_after(ttd, fl->expires))
	104	fl->expires = ttd;
	105	ttd = fl->expires;
	106	if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
	107	struct ipv6_txoptions *opt = fl->opt;
	108	fl->opt = NULL;
	109	kfree(opt);
	110	}
	111	if (!timer_pending(&ip6_fl_gc_timer) \|\|
	112	time_after(ip6_fl_gc_timer.expires, ttd))
	113	mod_timer(&ip6_fl_gc_timer, ttd);
	114	}
	115
	116	write_unlock_bh(&ip6_fl_lock);
	117	}
	118
	119	static void ip6_fl_gc(unsigned long dummy)
	120	{
	121	int i;
	122	unsigned long now = jiffies;
	123	unsigned long sched = 0;
	124
	125	write_lock(&ip6_fl_lock);
	126
	127	for (i=0; i<=FL_HASH_MASK; i++) {
	128	struct ip6_flowlabel fl, *flp;
	129	flp = &fl_ht[i];
	130	while ((fl=*flp) != NULL) {
	131	if (atomic_read(&fl->users) == 0) {
	132	unsigned long ttd = fl->lastuse + fl->linger;
	133	if (time_after(ttd, fl->expires))
	134	fl->expires = ttd;
	135	ttd = fl->expires;
	136	if (time_after_eq(now, ttd)) {
	137	*flp = fl->next;
	138	fl_free(fl);
	139	atomic_dec(&fl_size);
	140	continue;
141	}
142	if (!sched \|\| time_before(ttd, sched))
143	sched = ttd;
144	}
145	flp = &fl->next;
146	}
147	}
148	if (!sched && atomic_read(&fl_size))
149	sched = now + FL_MAX_LINGER;
150	if (sched) {
151	ip6_fl_gc_timer.expires = sched;
152	add_timer(&ip6_fl_gc_timer);
153	}
154	write_unlock(&ip6_fl_lock);
155	}
156
78c2e502	157	static struct ip6_flowlabel fl_intern(struct ip6_flowlabel fl, __be32 label)
1da177e4	158	{
78c2e502 PE	159	struct ip6_flowlabel *lfl;
78c2e502 PE	160
1da177e4 LT	161	fl->label = label & IPV6_FLOWLABEL_MASK;
	162
	163	write_lock_bh(&ip6_fl_lock);
	164	if (label == 0) {
	165	for (;;) {
	166	fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
	167	if (fl->label) {
1da177e4 LT	168	lfl = __fl_lookup(fl->label);
	169	if (lfl == NULL)
	170	break;
	171	}
	172	}
78c2e502 PE	173	} else {
	174	/*
	175	* we dropper the ip6_fl_lock, so this entry could reappear
	176	* and we need to recheck with it.
	177	*
	178	* OTOH no need to search the active socket first, like it is
	179	* done in ipv6_flowlabel_opt - sock is locked, so new entry
	180	* with the same label can only appear on another sock
	181	*/
	182	lfl = __fl_lookup(fl->label);
	183	if (lfl != NULL) {
	184	atomic_inc(&lfl->users);
	185	write_unlock_bh(&ip6_fl_lock);
	186	return lfl;
	187	}
1da177e4 LT	188	}
	189
	190	fl->lastuse = jiffies;
	191	fl->next = fl_ht[FL_HASH(fl->label)];
	192	fl_ht[FL_HASH(fl->label)] = fl;
	193	atomic_inc(&fl_size);
	194	write_unlock_bh(&ip6_fl_lock);
78c2e502	195	return NULL;
1da177e4 LT	196	}
	197
	198
	199
	200	/* Socket flowlabel lists */
	201
90bcaf7b	202	struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
1da177e4 LT	203	{
	204	struct ipv6_fl_socklist *sfl;
	205	struct ipv6_pinfo *np = inet6_sk(sk);
	206
	207	label &= IPV6_FLOWLABEL_MASK;
	208
bd0bf577	209	read_lock_bh(&ip6_sk_fl_lock);
1da177e4 LT	210	for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
	211	struct ip6_flowlabel *fl = sfl->fl;
	212	if (fl->label == label) {
	213	fl->lastuse = jiffies;
	214	atomic_inc(&fl->users);
52f095ee	215	read_unlock_bh(&ip6_sk_fl_lock);
1da177e4 LT	216	return fl;
	217	}
	218	}
bd0bf577	219	read_unlock_bh(&ip6_sk_fl_lock);
1da177e4 LT	220	return NULL;
	221	}
	222
3cf3dc6c ACM	223	EXPORT_SYMBOL_GPL(fl6_sock_lookup);
3cf3dc6c ACM	224
1da177e4 LT	225	void fl6_free_socklist(struct sock *sk)
	226	{
	227	struct ipv6_pinfo *np = inet6_sk(sk);
	228	struct ipv6_fl_socklist *sfl;
	229
	230	while ((sfl = np->ipv6_fl_list) != NULL) {
	231	np->ipv6_fl_list = sfl->next;
	232	fl_release(sfl->fl);
	233	kfree(sfl);
	234	}
	235	}
	236
	237	/* Service routines */
	238
	239
	240	/*
	241	It is the only difficult place. flowlabel enforces equal headers
	242	before and including routing header, however user may supply options
	243	following rthdr.
	244	*/
	245
	246	struct ipv6_txoptions fl6_merge_options(struct ipv6_txoptions opt_space,
	247	struct ip6_flowlabel * fl,
	248	struct ipv6_txoptions * fopt)
	249	{
df9890c3	250	struct ipv6_txoptions * fl_opt = fl->opt;
1ab1457c	251
df9890c3 YH	252	if (fopt == NULL \|\| fopt->opt_flen == 0)
df9890c3 YH	253	return fl_opt;
1ab1457c	254
1da177e4 LT	255	if (fl_opt != NULL) {
1da177e4 LT	256	opt_space->hopopt = fl_opt->hopopt;
df9890c3	257	opt_space->dst0opt = fl_opt->dst0opt;
1da177e4 LT	258	opt_space->srcrt = fl_opt->srcrt;
	259	opt_space->opt_nflen = fl_opt->opt_nflen;
	260	} else {
	261	if (fopt->opt_nflen == 0)
	262	return fopt;
	263	opt_space->hopopt = NULL;
	264	opt_space->dst0opt = NULL;
	265	opt_space->srcrt = NULL;
	266	opt_space->opt_nflen = 0;
	267	}
	268	opt_space->dst1opt = fopt->dst1opt;
1da177e4 LT	269	opt_space->opt_flen = fopt->opt_flen;
	270	return opt_space;
	271	}
	272
	273	static unsigned long check_linger(unsigned long ttl)
	274	{
	275	if (ttl < FL_MIN_LINGER)
	276	return FL_MIN_LINGER*HZ;
	277	if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
	278	return 0;
	279	return ttl*HZ;
	280	}
	281
	282	static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
	283	{
	284	linger = check_linger(linger);
	285	if (!linger)
	286	return -EPERM;
	287	expires = check_linger(expires);
	288	if (!expires)
	289	return -EPERM;
	290	fl->lastuse = jiffies;
	291	if (time_before(fl->linger, linger))
	292	fl->linger = linger;
	293	if (time_before(expires, fl->linger))
	294	expires = fl->linger;
	295	if (time_before(fl->expires, fl->lastuse + expires))
	296	fl->expires = fl->lastuse + expires;
	297	return 0;
	298	}
	299
	300	static struct ip6_flowlabel *
	301	fl_create(struct in6_flowlabel_req freq, char __user optval, int optlen, int *err_p)
	302	{
	303	struct ip6_flowlabel *fl;
	304	int olen;
	305	int addr_type;
	306	int err;
	307
	308	err = -ENOMEM;
0c600eda	309	fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1da177e4 LT	310	if (fl == NULL)
1da177e4 LT	311	goto done;
1da177e4 LT	312
	313	olen = optlen - CMSG_ALIGN(sizeof(*freq));
	314	if (olen > 0) {
	315	struct msghdr msg;
	316	struct flowi flowi;
	317	int junk;
	318
	319	err = -ENOMEM;
	320	fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
	321	if (fl->opt == NULL)
	322	goto done;
	323
	324	memset(fl->opt, 0, sizeof(*fl->opt));
	325	fl->opt->tot_len = sizeof(*fl->opt) + olen;
	326	err = -EFAULT;
	327	if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
	328	goto done;
	329
	330	msg.msg_controllen = olen;
	331	msg.msg_control = (void*)(fl->opt+1);
	332	flowi.oif = 0;
	333
41a1f8ea	334	err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk);
1da177e4 LT	335	if (err)
	336	goto done;
	337	err = -EINVAL;
	338	if (fl->opt->opt_flen)
	339	goto done;
	340	if (fl->opt->opt_nflen == 0) {
	341	kfree(fl->opt);
	342	fl->opt = NULL;
	343	}
	344	}
	345
	346	fl->expires = jiffies;
	347	err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
	348	if (err)
	349	goto done;
	350	fl->share = freq->flr_share;
	351	addr_type = ipv6_addr_type(&freq->flr_dst);
	352	if ((addr_type&IPV6_ADDR_MAPPED)
c6817e4c JM	353	\|\| addr_type == IPV6_ADDR_ANY) {
c6817e4c JM	354	err = -EINVAL;
1da177e4	355	goto done;
c6817e4c	356	}
1da177e4 LT	357	ipv6_addr_copy(&fl->dst, &freq->flr_dst);
	358	atomic_set(&fl->users, 1);
	359	switch (fl->share) {
	360	case IPV6_FL_S_EXCL:
	361	case IPV6_FL_S_ANY:
	362	break;
	363	case IPV6_FL_S_PROCESS:
	364	fl->owner = current->pid;
	365	break;
	366	case IPV6_FL_S_USER:
	367	fl->owner = current->euid;
	368	break;
	369	default:
	370	err = -EINVAL;
	371	goto done;
	372	}
	373	return fl;
	374
	375	done:
	376	fl_free(fl);
	377	*err_p = err;
	378	return NULL;
	379	}
	380
	381	static int mem_check(struct sock *sk)
	382	{
	383	struct ipv6_pinfo *np = inet6_sk(sk);
	384	struct ipv6_fl_socklist *sfl;
	385	int room = FL_MAX_SIZE - atomic_read(&fl_size);
	386	int count = 0;
	387
	388	if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
	389	return 0;
	390
	391	for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
	392	count++;
	393
	394	if (room <= 0 \|\|
	395	((count >= FL_MAX_PER_SOCK \|\|
	396	(count > 0 && room < FL_MAX_SIZE/2) \|\| room < FL_MAX_SIZE/4)
	397	&& !capable(CAP_NET_ADMIN)))
	398	return -ENOBUFS;
	399
	400	return 0;
	401	}
	402
	403	static int ipv6_hdr_cmp(struct ipv6_opt_hdr h1, struct ipv6_opt_hdr h2)
	404	{
	405	if (h1 == h2)
	406	return 0;
	407	if (h1 == NULL \|\| h2 == NULL)
	408	return 1;
	409	if (h1->hdrlen != h2->hdrlen)
	410	return 1;
	411	return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
	412	}
	413
	414	static int ipv6_opt_cmp(struct ipv6_txoptions o1, struct ipv6_txoptions o2)
	415	{
	416	if (o1 == o2)
	417	return 0;
	418	if (o1 == NULL \|\| o2 == NULL)
	419	return 1;
	420	if (o1->opt_nflen != o2->opt_nflen)
421	return 1;
422	if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
423	return 1;
424	if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
425	return 1;
426	if (ipv6_hdr_cmp((struct ipv6_opt_hdr )o1->srcrt, (struct ipv6_opt_hdr )o2->srcrt))
427	return 1;
428	return 0;
429	}
430
04028045 PE	431	static inline void fl_link(struct ipv6_pinfo np, struct ipv6_fl_socklist sfl,
	432	struct ip6_flowlabel *fl)
	433	{
	434	write_lock_bh(&ip6_sk_fl_lock);
	435	sfl->fl = fl;
	436	sfl->next = np->ipv6_fl_list;
	437	np->ipv6_fl_list = sfl;
	438	write_unlock_bh(&ip6_sk_fl_lock);
	439	}
	440
1da177e4 LT	441	int ipv6_flowlabel_opt(struct sock sk, char __user optval, int optlen)
	442	{
	443	int err;
	444	struct ipv6_pinfo *np = inet6_sk(sk);
	445	struct in6_flowlabel_req freq;
	446	struct ipv6_fl_socklist *sfl1=NULL;
	447	struct ipv6_fl_socklist sfl, *sflp;
78c2e502 PE	448	struct ip6_flowlabel fl, fl1 = NULL;
78c2e502 PE	449
1da177e4 LT	450
	451	if (optlen < sizeof(freq))
	452	return -EINVAL;
	453
	454	if (copy_from_user(&freq, optval, sizeof(freq)))
	455	return -EFAULT;
	456
	457	switch (freq.flr_action) {
	458	case IPV6_FL_A_PUT:
	459	write_lock_bh(&ip6_sk_fl_lock);
	460	for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
	461	if (sfl->fl->label == freq.flr_label) {
	462	if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
	463	np->flow_label &= ~IPV6_FLOWLABEL_MASK;
	464	*sflp = sfl->next;
	465	write_unlock_bh(&ip6_sk_fl_lock);
	466	fl_release(sfl->fl);
	467	kfree(sfl);
	468	return 0;
	469	}
	470	}
	471	write_unlock_bh(&ip6_sk_fl_lock);
	472	return -ESRCH;
	473
	474	case IPV6_FL_A_RENEW:
	475	read_lock_bh(&ip6_sk_fl_lock);
	476	for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
	477	if (sfl->fl->label == freq.flr_label) {
	478	err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
	479	read_unlock_bh(&ip6_sk_fl_lock);
	480	return err;
	481	}
	482	}
	483	read_unlock_bh(&ip6_sk_fl_lock);
	484
	485	if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
	486	fl = fl_lookup(freq.flr_label);
	487	if (fl) {
	488	err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
	489	fl_release(fl);
	490	return err;
	491	}
	492	}
	493	return -ESRCH;
	494
	495	case IPV6_FL_A_GET:
	496	if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
	497	return -EINVAL;
	498
	499	fl = fl_create(&freq, optval, optlen, &err);
	500	if (fl == NULL)
	501	return err;
	502	sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
	503
	504	if (freq.flr_label) {
1da177e4 LT	505	err = -EEXIST;
	506	read_lock_bh(&ip6_sk_fl_lock);
	507	for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
	508	if (sfl->fl->label == freq.flr_label) {
	509	if (freq.flr_flags&IPV6_FL_F_EXCL) {
	510	read_unlock_bh(&ip6_sk_fl_lock);
	511	goto done;
	512	}
	513	fl1 = sfl->fl;
4ea6a804	514	atomic_inc(&fl1->users);
1da177e4 LT	515	break;
	516	}
	517	}
	518	read_unlock_bh(&ip6_sk_fl_lock);
	519
	520	if (fl1 == NULL)
	521	fl1 = fl_lookup(freq.flr_label);
	522	if (fl1) {
78c2e502	523	recheck:
1da177e4 LT	524	err = -EEXIST;
	525	if (freq.flr_flags&IPV6_FL_F_EXCL)
	526	goto release;
	527	err = -EPERM;
	528	if (fl1->share == IPV6_FL_S_EXCL \|\|
	529	fl1->share != fl->share \|\|
	530	fl1->owner != fl->owner)
	531	goto release;
	532
	533	err = -EINVAL;
	534	if (!ipv6_addr_equal(&fl1->dst, &fl->dst) \|\|
	535	ipv6_opt_cmp(fl1->opt, fl->opt))
	536	goto release;
	537
	538	err = -ENOMEM;
	539	if (sfl1 == NULL)
	540	goto release;
	541	if (fl->linger > fl1->linger)
	542	fl1->linger = fl->linger;
	543	if ((long)(fl->expires - fl1->expires) > 0)
	544	fl1->expires = fl->expires;
04028045	545	fl_link(np, sfl1, fl1);
1da177e4 LT	546	fl_free(fl);
	547	return 0;
	548
	549	release:
	550	fl_release(fl1);
	551	goto done;
	552	}
	553	}
	554	err = -ENOENT;
	555	if (!(freq.flr_flags&IPV6_FL_F_CREATE))
	556	goto done;
	557
	558	err = -ENOMEM;
	559	if (sfl1 == NULL \|\| (err = mem_check(sk)) != 0)
	560	goto done;
	561
78c2e502 PE	562	fl1 = fl_intern(fl, freq.flr_label);
	563	if (fl1 != NULL)
	564	goto recheck;
1da177e4	565
6c94d361 DM	566	if (!freq.flr_label) {
	567	if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
	568	&fl->label, sizeof(fl->label))) {
	569	/* Intentionally ignore fault. */
	570	}
	571	}
1da177e4	572
04028045	573	fl_link(np, sfl1, fl);
1da177e4 LT	574	return 0;
	575
	576	default:
	577	return -EINVAL;
	578	}
	579
	580	done:
	581	fl_free(fl);
	582	kfree(sfl1);
	583	return err;
	584	}
	585
	586	#ifdef CONFIG_PROC_FS
	587
	588	struct ip6fl_iter_state {
	589	int bucket;
	590	};
	591
	592	#define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
	593
	594	static struct ip6_flowlabel ip6fl_get_first(struct seq_file seq)
	595	{
	596	struct ip6_flowlabel *fl = NULL;
	597	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
	598
	599	for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
	600	if (fl_ht[state->bucket]) {
	601	fl = fl_ht[state->bucket];
	602	break;
	603	}
	604	}
	605	return fl;
	606	}
	607
	608	static struct ip6_flowlabel ip6fl_get_next(struct seq_file seq, struct ip6_flowlabel *fl)
	609	{
	610	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
	611
	612	fl = fl->next;
	613	while (!fl) {
	614	if (++state->bucket <= FL_HASH_MASK)
	615	fl = fl_ht[state->bucket];
bcd62075 JM	616	else
bcd62075 JM	617	break;
1da177e4 LT	618	}
	619	return fl;
	620	}
	621
	622	static struct ip6_flowlabel ip6fl_get_idx(struct seq_file seq, loff_t pos)
	623	{
	624	struct ip6_flowlabel *fl = ip6fl_get_first(seq);
	625	if (fl)
	626	while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
	627	--pos;
	628	return pos ? NULL : fl;
	629	}
	630
	631	static void ip6fl_seq_start(struct seq_file seq, loff_t *pos)
	632	{
	633	read_lock_bh(&ip6_fl_lock);
	634	return pos ? ip6fl_get_idx(seq, pos - 1) : SEQ_START_TOKEN;
	635	}
	636
	637	static void ip6fl_seq_next(struct seq_file seq, void v, loff_t pos)
	638	{
	639	struct ip6_flowlabel *fl;
	640
	641	if (v == SEQ_START_TOKEN)
	642	fl = ip6fl_get_first(seq);
	643	else
	644	fl = ip6fl_get_next(seq, v);
	645	++*pos;
	646	return fl;
	647	}
	648
	649	static void ip6fl_seq_stop(struct seq_file seq, void v)
	650	{
	651	read_unlock_bh(&ip6_fl_lock);
	652	}
	653
1b7c2dbc	654	static int ip6fl_seq_show(struct seq_file seq, void v)
1da177e4	655	{
1b7c2dbc JM	656	if (v == SEQ_START_TOKEN)
	657	seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
	658	"Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
	659	else {
	660	struct ip6_flowlabel *fl = v;
1da177e4	661	seq_printf(seq,
9343e79a	662	"%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n",
1da177e4 LT	663	(unsigned)ntohl(fl->label),
	664	fl->share,
	665	(unsigned)fl->owner,
	666	atomic_read(&fl->users),
	667	fl->linger/HZ,
	668	(long)(fl->expires - jiffies)/HZ,
	669	NIP6(fl->dst),
	670	fl->opt ? fl->opt->opt_nflen : 0);
1da177e4	671	}
1da177e4 LT	672	return 0;
	673	}
	674
56b3d975	675	static const struct seq_operations ip6fl_seq_ops = {
1da177e4 LT	676	.start = ip6fl_seq_start,
	677	.next = ip6fl_seq_next,
	678	.stop = ip6fl_seq_stop,
	679	.show = ip6fl_seq_show,
	680	};
	681
	682	static int ip6fl_seq_open(struct inode inode, struct file file)
	683	{
cf7732e4 PE	684	return seq_open_private(file, &ip6fl_seq_ops,
cf7732e4 PE	685	sizeof(struct ip6fl_iter_state));
1da177e4 LT	686	}
1da177e4 LT	687
9a32144e	688	static const struct file_operations ip6fl_seq_fops = {
1da177e4 LT	689	.owner = THIS_MODULE,
	690	.open = ip6fl_seq_open,
	691	.read = seq_read,
	692	.llseek = seq_lseek,
	693	.release = seq_release_private,
	694	};
1da177e4	695
0a3e78ac DL	696	static int ip6_flowlabel_proc_init(struct net *net)
	697	{
	698	if (!proc_net_fops_create(net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops))
	699	return -ENOMEM;
	700	return 0;
	701	}
1da177e4	702
0a3e78ac	703	static void ip6_flowlabel_proc_fini(struct net *net)
1da177e4	704	{
0a3e78ac DL	705	proc_net_remove(net, "ip6_flowlabel");
	706	}
	707	#else
	708	static inline int ip6_flowlabel_proc_init(struct net *net)
	709	{
	710	return 0;
	711	}
	712	static inline void ip6_flowlabel_proc_fini(struct net *net)
	713	{
	714	return ;
	715	}
1da177e4	716	#endif
0a3e78ac DL	717
	718	int ip6_flowlabel_init(void)
	719	{
	720	return ip6_flowlabel_proc_init(&init_net);
1da177e4 LT	721	}
	722
	723	void ip6_flowlabel_cleanup(void)
	724	{
	725	del_timer(&ip6_fl_gc_timer);
0a3e78ac	726	ip6_flowlabel_proc_fini(&init_net);
1da177e4	727	}