704 lines
15 KiB
C
704 lines
15 KiB
C
/*
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* ip6_flowlabel.c IPv6 flowlabel manager.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*/
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/in6.h>
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#include <linux/route.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/sock.h>
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#include <net/ipv6.h>
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#include <net/ndisc.h>
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#include <net/protocol.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/rawv6.h>
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#include <net/icmp.h>
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#include <net/transp_v6.h>
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#include <asm/uaccess.h>
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#define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
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in old IPv6 RFC. Well, it was reasonable value.
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*/
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#define FL_MAX_LINGER 60 /* Maximal linger timeout */
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/* FL hash table */
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#define FL_MAX_PER_SOCK 32
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#define FL_MAX_SIZE 4096
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#define FL_HASH_MASK 255
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#define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
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static atomic_t fl_size = ATOMIC_INIT(0);
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static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
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static void ip6_fl_gc(unsigned long dummy);
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static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
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/* FL hash table lock: it protects only of GC */
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static DEFINE_RWLOCK(ip6_fl_lock);
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/* Big socket sock */
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static DEFINE_RWLOCK(ip6_sk_fl_lock);
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static __inline__ struct ip6_flowlabel * __fl_lookup(__be32 label)
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{
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struct ip6_flowlabel *fl;
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for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
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if (fl->label == label)
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return fl;
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}
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return NULL;
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}
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static struct ip6_flowlabel * fl_lookup(__be32 label)
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{
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struct ip6_flowlabel *fl;
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read_lock_bh(&ip6_fl_lock);
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fl = __fl_lookup(label);
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if (fl)
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atomic_inc(&fl->users);
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read_unlock_bh(&ip6_fl_lock);
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return fl;
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}
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static void fl_free(struct ip6_flowlabel *fl)
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{
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if (fl)
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kfree(fl->opt);
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kfree(fl);
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}
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static void fl_release(struct ip6_flowlabel *fl)
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{
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write_lock_bh(&ip6_fl_lock);
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fl->lastuse = jiffies;
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if (atomic_dec_and_test(&fl->users)) {
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unsigned long ttd = fl->lastuse + fl->linger;
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if (time_after(ttd, fl->expires))
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fl->expires = ttd;
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ttd = fl->expires;
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if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
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struct ipv6_txoptions *opt = fl->opt;
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fl->opt = NULL;
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kfree(opt);
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}
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if (!timer_pending(&ip6_fl_gc_timer) ||
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time_after(ip6_fl_gc_timer.expires, ttd))
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mod_timer(&ip6_fl_gc_timer, ttd);
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}
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write_unlock_bh(&ip6_fl_lock);
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}
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static void ip6_fl_gc(unsigned long dummy)
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{
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int i;
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unsigned long now = jiffies;
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unsigned long sched = 0;
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write_lock(&ip6_fl_lock);
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for (i=0; i<=FL_HASH_MASK; i++) {
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struct ip6_flowlabel *fl, **flp;
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flp = &fl_ht[i];
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while ((fl=*flp) != NULL) {
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if (atomic_read(&fl->users) == 0) {
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unsigned long ttd = fl->lastuse + fl->linger;
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if (time_after(ttd, fl->expires))
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fl->expires = ttd;
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ttd = fl->expires;
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if (time_after_eq(now, ttd)) {
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*flp = fl->next;
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fl_free(fl);
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atomic_dec(&fl_size);
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continue;
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}
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if (!sched || time_before(ttd, sched))
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sched = ttd;
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}
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flp = &fl->next;
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}
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}
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if (!sched && atomic_read(&fl_size))
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sched = now + FL_MAX_LINGER;
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if (sched) {
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ip6_fl_gc_timer.expires = sched;
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add_timer(&ip6_fl_gc_timer);
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}
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write_unlock(&ip6_fl_lock);
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}
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static int fl_intern(struct ip6_flowlabel *fl, __be32 label)
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{
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fl->label = label & IPV6_FLOWLABEL_MASK;
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write_lock_bh(&ip6_fl_lock);
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if (label == 0) {
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for (;;) {
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fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
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if (fl->label) {
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struct ip6_flowlabel *lfl;
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lfl = __fl_lookup(fl->label);
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if (lfl == NULL)
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break;
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}
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}
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}
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fl->lastuse = jiffies;
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fl->next = fl_ht[FL_HASH(fl->label)];
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fl_ht[FL_HASH(fl->label)] = fl;
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atomic_inc(&fl_size);
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write_unlock_bh(&ip6_fl_lock);
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return 0;
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}
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/* Socket flowlabel lists */
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struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
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{
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struct ipv6_fl_socklist *sfl;
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struct ipv6_pinfo *np = inet6_sk(sk);
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label &= IPV6_FLOWLABEL_MASK;
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for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
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struct ip6_flowlabel *fl = sfl->fl;
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if (fl->label == label) {
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fl->lastuse = jiffies;
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atomic_inc(&fl->users);
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return fl;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(fl6_sock_lookup);
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void fl6_free_socklist(struct sock *sk)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct ipv6_fl_socklist *sfl;
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while ((sfl = np->ipv6_fl_list) != NULL) {
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np->ipv6_fl_list = sfl->next;
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fl_release(sfl->fl);
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kfree(sfl);
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}
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}
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/* Service routines */
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/*
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It is the only difficult place. flowlabel enforces equal headers
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before and including routing header, however user may supply options
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following rthdr.
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*/
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struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
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struct ip6_flowlabel * fl,
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struct ipv6_txoptions * fopt)
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{
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struct ipv6_txoptions * fl_opt = fl->opt;
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if (fopt == NULL || fopt->opt_flen == 0)
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return fl_opt;
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if (fl_opt != NULL) {
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opt_space->hopopt = fl_opt->hopopt;
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opt_space->dst0opt = fl_opt->dst0opt;
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opt_space->srcrt = fl_opt->srcrt;
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opt_space->opt_nflen = fl_opt->opt_nflen;
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} else {
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if (fopt->opt_nflen == 0)
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return fopt;
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opt_space->hopopt = NULL;
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opt_space->dst0opt = NULL;
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opt_space->srcrt = NULL;
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opt_space->opt_nflen = 0;
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}
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opt_space->dst1opt = fopt->dst1opt;
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opt_space->opt_flen = fopt->opt_flen;
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return opt_space;
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}
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static unsigned long check_linger(unsigned long ttl)
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{
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if (ttl < FL_MIN_LINGER)
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return FL_MIN_LINGER*HZ;
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if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
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return 0;
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return ttl*HZ;
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}
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static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
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{
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linger = check_linger(linger);
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if (!linger)
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return -EPERM;
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expires = check_linger(expires);
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if (!expires)
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return -EPERM;
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fl->lastuse = jiffies;
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if (time_before(fl->linger, linger))
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fl->linger = linger;
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if (time_before(expires, fl->linger))
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expires = fl->linger;
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if (time_before(fl->expires, fl->lastuse + expires))
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fl->expires = fl->lastuse + expires;
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return 0;
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}
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static struct ip6_flowlabel *
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fl_create(struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p)
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{
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struct ip6_flowlabel *fl;
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int olen;
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int addr_type;
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int err;
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err = -ENOMEM;
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fl = kzalloc(sizeof(*fl), GFP_KERNEL);
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if (fl == NULL)
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goto done;
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olen = optlen - CMSG_ALIGN(sizeof(*freq));
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if (olen > 0) {
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struct msghdr msg;
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struct flowi flowi;
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int junk;
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err = -ENOMEM;
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fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
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if (fl->opt == NULL)
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goto done;
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memset(fl->opt, 0, sizeof(*fl->opt));
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fl->opt->tot_len = sizeof(*fl->opt) + olen;
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err = -EFAULT;
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if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
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goto done;
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msg.msg_controllen = olen;
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msg.msg_control = (void*)(fl->opt+1);
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flowi.oif = 0;
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err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk);
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if (err)
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goto done;
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err = -EINVAL;
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if (fl->opt->opt_flen)
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goto done;
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if (fl->opt->opt_nflen == 0) {
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kfree(fl->opt);
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fl->opt = NULL;
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}
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}
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fl->expires = jiffies;
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err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
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if (err)
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goto done;
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fl->share = freq->flr_share;
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addr_type = ipv6_addr_type(&freq->flr_dst);
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if ((addr_type&IPV6_ADDR_MAPPED)
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|| addr_type == IPV6_ADDR_ANY) {
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err = -EINVAL;
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goto done;
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}
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ipv6_addr_copy(&fl->dst, &freq->flr_dst);
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atomic_set(&fl->users, 1);
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switch (fl->share) {
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case IPV6_FL_S_EXCL:
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case IPV6_FL_S_ANY:
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break;
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case IPV6_FL_S_PROCESS:
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fl->owner = current->pid;
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break;
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case IPV6_FL_S_USER:
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fl->owner = current->euid;
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break;
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default:
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err = -EINVAL;
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goto done;
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}
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return fl;
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done:
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fl_free(fl);
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*err_p = err;
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return NULL;
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}
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static int mem_check(struct sock *sk)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct ipv6_fl_socklist *sfl;
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int room = FL_MAX_SIZE - atomic_read(&fl_size);
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int count = 0;
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if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
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return 0;
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for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
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count++;
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if (room <= 0 ||
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((count >= FL_MAX_PER_SOCK ||
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(count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4)
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&& !capable(CAP_NET_ADMIN)))
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return -ENOBUFS;
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return 0;
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}
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static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
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{
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if (h1 == h2)
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return 0;
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if (h1 == NULL || h2 == NULL)
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return 1;
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if (h1->hdrlen != h2->hdrlen)
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return 1;
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return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
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}
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static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
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{
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if (o1 == o2)
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return 0;
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if (o1 == NULL || o2 == NULL)
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return 1;
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if (o1->opt_nflen != o2->opt_nflen)
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return 1;
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if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
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return 1;
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if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
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return 1;
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if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
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return 1;
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return 0;
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}
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int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
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{
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int err;
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct in6_flowlabel_req freq;
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struct ipv6_fl_socklist *sfl1=NULL;
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struct ipv6_fl_socklist *sfl, **sflp;
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struct ip6_flowlabel *fl;
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if (optlen < sizeof(freq))
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return -EINVAL;
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if (copy_from_user(&freq, optval, sizeof(freq)))
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return -EFAULT;
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switch (freq.flr_action) {
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case IPV6_FL_A_PUT:
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write_lock_bh(&ip6_sk_fl_lock);
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for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
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if (sfl->fl->label == freq.flr_label) {
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if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
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np->flow_label &= ~IPV6_FLOWLABEL_MASK;
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*sflp = sfl->next;
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write_unlock_bh(&ip6_sk_fl_lock);
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fl_release(sfl->fl);
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kfree(sfl);
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return 0;
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}
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}
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write_unlock_bh(&ip6_sk_fl_lock);
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return -ESRCH;
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case IPV6_FL_A_RENEW:
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read_lock_bh(&ip6_sk_fl_lock);
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for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
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if (sfl->fl->label == freq.flr_label) {
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err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
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read_unlock_bh(&ip6_sk_fl_lock);
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return err;
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}
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}
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read_unlock_bh(&ip6_sk_fl_lock);
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if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
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fl = fl_lookup(freq.flr_label);
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if (fl) {
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err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
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fl_release(fl);
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return err;
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}
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}
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return -ESRCH;
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case IPV6_FL_A_GET:
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if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
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return -EINVAL;
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fl = fl_create(&freq, optval, optlen, &err);
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if (fl == NULL)
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return err;
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sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
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if (freq.flr_label) {
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struct ip6_flowlabel *fl1 = NULL;
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err = -EEXIST;
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read_lock_bh(&ip6_sk_fl_lock);
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for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
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if (sfl->fl->label == freq.flr_label) {
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if (freq.flr_flags&IPV6_FL_F_EXCL) {
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read_unlock_bh(&ip6_sk_fl_lock);
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goto done;
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}
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fl1 = sfl->fl;
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atomic_inc(&fl1->users);
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break;
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}
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}
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read_unlock_bh(&ip6_sk_fl_lock);
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if (fl1 == NULL)
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fl1 = fl_lookup(freq.flr_label);
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if (fl1) {
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err = -EEXIST;
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if (freq.flr_flags&IPV6_FL_F_EXCL)
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goto release;
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err = -EPERM;
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if (fl1->share == IPV6_FL_S_EXCL ||
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fl1->share != fl->share ||
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fl1->owner != fl->owner)
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goto release;
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err = -EINVAL;
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if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
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ipv6_opt_cmp(fl1->opt, fl->opt))
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goto release;
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err = -ENOMEM;
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if (sfl1 == NULL)
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|
goto release;
|
|
if (fl->linger > fl1->linger)
|
|
fl1->linger = fl->linger;
|
|
if ((long)(fl->expires - fl1->expires) > 0)
|
|
fl1->expires = fl->expires;
|
|
write_lock_bh(&ip6_sk_fl_lock);
|
|
sfl1->fl = fl1;
|
|
sfl1->next = np->ipv6_fl_list;
|
|
np->ipv6_fl_list = sfl1;
|
|
write_unlock_bh(&ip6_sk_fl_lock);
|
|
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;
|
|
|
|
err = fl_intern(fl, freq.flr_label);
|
|
if (err)
|
|
goto done;
|
|
|
|
if (!freq.flr_label) {
|
|
if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
|
|
&fl->label, sizeof(fl->label))) {
|
|
/* Intentionally ignore fault. */
|
|
}
|
|
}
|
|
|
|
sfl1->fl = fl;
|
|
sfl1->next = np->ipv6_fl_list;
|
|
np->ipv6_fl_list = sfl1;
|
|
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 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)
|
|
{
|
|
struct seq_file *seq;
|
|
int rc = -ENOMEM;
|
|
struct ip6fl_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
if (!s)
|
|
goto out;
|
|
|
|
rc = seq_open(file, &ip6fl_seq_ops);
|
|
if (rc)
|
|
goto out_kfree;
|
|
|
|
seq = file->private_data;
|
|
seq->private = s;
|
|
out:
|
|
return rc;
|
|
out_kfree:
|
|
kfree(s);
|
|
goto out;
|
|
}
|
|
|
|
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,
|
|
};
|
|
#endif
|
|
|
|
|
|
void ip6_flowlabel_init(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_fops_create("ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops);
|
|
#endif
|
|
}
|
|
|
|
void ip6_flowlabel_cleanup(void)
|
|
{
|
|
del_timer(&ip6_fl_gc_timer);
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_remove("ip6_flowlabel");
|
|
#endif
|
|
}
|