11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * ip6_flowlabel.c IPv6 flowlabel manager. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 51da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 61da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 71da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 124fc268d2SRandy Dunlap #include <linux/capability.h> 131da177e4SLinus Torvalds #include <linux/errno.h> 141da177e4SLinus Torvalds #include <linux/types.h> 151da177e4SLinus Torvalds #include <linux/socket.h> 161da177e4SLinus Torvalds #include <linux/net.h> 171da177e4SLinus Torvalds #include <linux/netdevice.h> 181da177e4SLinus Torvalds #include <linux/if_arp.h> 191da177e4SLinus Torvalds #include <linux/in6.h> 201da177e4SLinus Torvalds #include <linux/route.h> 211da177e4SLinus Torvalds #include <linux/proc_fs.h> 221da177e4SLinus Torvalds #include <linux/seq_file.h> 231da177e4SLinus Torvalds 24457c4cbcSEric W. Biederman #include <net/net_namespace.h> 251da177e4SLinus Torvalds #include <net/sock.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <net/ipv6.h> 281da177e4SLinus Torvalds #include <net/ndisc.h> 291da177e4SLinus Torvalds #include <net/protocol.h> 301da177e4SLinus Torvalds #include <net/ip6_route.h> 311da177e4SLinus Torvalds #include <net/addrconf.h> 321da177e4SLinus Torvalds #include <net/rawv6.h> 331da177e4SLinus Torvalds #include <net/icmp.h> 341da177e4SLinus Torvalds #include <net/transp_v6.h> 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds #include <asm/uaccess.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified 391da177e4SLinus Torvalds in old IPv6 RFC. Well, it was reasonable value. 401da177e4SLinus Torvalds */ 411da177e4SLinus Torvalds #define FL_MAX_LINGER 60 /* Maximal linger timeout */ 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds /* FL hash table */ 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds #define FL_MAX_PER_SOCK 32 461da177e4SLinus Torvalds #define FL_MAX_SIZE 4096 471da177e4SLinus Torvalds #define FL_HASH_MASK 255 481da177e4SLinus Torvalds #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK) 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds static atomic_t fl_size = ATOMIC_INIT(0); 511da177e4SLinus Torvalds static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1]; 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds static void ip6_fl_gc(unsigned long dummy); 548d06afabSIngo Molnar static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0); 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds /* FL hash table lock: it protects only of GC */ 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds static DEFINE_RWLOCK(ip6_fl_lock); 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds /* Big socket sock */ 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds static DEFINE_RWLOCK(ip6_sk_fl_lock); 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds 6560e8fbc4SBenjamin Thery static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) 661da177e4SLinus Torvalds { 671da177e4SLinus Torvalds struct ip6_flowlabel *fl; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) { 7060e8fbc4SBenjamin Thery if (fl->label == label && fl->fl_net == net) 711da177e4SLinus Torvalds return fl; 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds return NULL; 741da177e4SLinus Torvalds } 751da177e4SLinus Torvalds 7660e8fbc4SBenjamin Thery static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label) 771da177e4SLinus Torvalds { 781da177e4SLinus Torvalds struct ip6_flowlabel *fl; 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds read_lock_bh(&ip6_fl_lock); 8160e8fbc4SBenjamin Thery fl = __fl_lookup(net, label); 821da177e4SLinus Torvalds if (fl) 831da177e4SLinus Torvalds atomic_inc(&fl->users); 841da177e4SLinus Torvalds read_unlock_bh(&ip6_fl_lock); 851da177e4SLinus Torvalds return fl; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds static void fl_free(struct ip6_flowlabel *fl) 901da177e4SLinus Torvalds { 9160e8fbc4SBenjamin Thery if (fl) { 9260e8fbc4SBenjamin Thery release_net(fl->fl_net); 931da177e4SLinus Torvalds kfree(fl->opt); 9460e8fbc4SBenjamin Thery } 951da177e4SLinus Torvalds kfree(fl); 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds static void fl_release(struct ip6_flowlabel *fl) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds write_lock_bh(&ip6_fl_lock); 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds fl->lastuse = jiffies; 1031da177e4SLinus Torvalds if (atomic_dec_and_test(&fl->users)) { 1041da177e4SLinus Torvalds unsigned long ttd = fl->lastuse + fl->linger; 1051da177e4SLinus Torvalds if (time_after(ttd, fl->expires)) 1061da177e4SLinus Torvalds fl->expires = ttd; 1071da177e4SLinus Torvalds ttd = fl->expires; 1081da177e4SLinus Torvalds if (fl->opt && fl->share == IPV6_FL_S_EXCL) { 1091da177e4SLinus Torvalds struct ipv6_txoptions *opt = fl->opt; 1101da177e4SLinus Torvalds fl->opt = NULL; 1111da177e4SLinus Torvalds kfree(opt); 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds if (!timer_pending(&ip6_fl_gc_timer) || 1141da177e4SLinus Torvalds time_after(ip6_fl_gc_timer.expires, ttd)) 1151da177e4SLinus Torvalds mod_timer(&ip6_fl_gc_timer, ttd); 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds write_unlock_bh(&ip6_fl_lock); 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds static void ip6_fl_gc(unsigned long dummy) 1211da177e4SLinus Torvalds { 1221da177e4SLinus Torvalds int i; 1231da177e4SLinus Torvalds unsigned long now = jiffies; 1241da177e4SLinus Torvalds unsigned long sched = 0; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds write_lock(&ip6_fl_lock); 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds for (i=0; i<=FL_HASH_MASK; i++) { 1291da177e4SLinus Torvalds struct ip6_flowlabel *fl, **flp; 1301da177e4SLinus Torvalds flp = &fl_ht[i]; 1311da177e4SLinus Torvalds while ((fl=*flp) != NULL) { 1321da177e4SLinus Torvalds if (atomic_read(&fl->users) == 0) { 1331da177e4SLinus Torvalds unsigned long ttd = fl->lastuse + fl->linger; 1341da177e4SLinus Torvalds if (time_after(ttd, fl->expires)) 1351da177e4SLinus Torvalds fl->expires = ttd; 1361da177e4SLinus Torvalds ttd = fl->expires; 1371da177e4SLinus Torvalds if (time_after_eq(now, ttd)) { 1381da177e4SLinus Torvalds *flp = fl->next; 1391da177e4SLinus Torvalds fl_free(fl); 1401da177e4SLinus Torvalds atomic_dec(&fl_size); 1411da177e4SLinus Torvalds continue; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds if (!sched || time_before(ttd, sched)) 1441da177e4SLinus Torvalds sched = ttd; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds flp = &fl->next; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds if (!sched && atomic_read(&fl_size)) 1501da177e4SLinus Torvalds sched = now + FL_MAX_LINGER; 1511da177e4SLinus Torvalds if (sched) { 15260e8fbc4SBenjamin Thery mod_timer(&ip6_fl_gc_timer, sched); 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds write_unlock(&ip6_fl_lock); 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 15760e8fbc4SBenjamin Thery static void ip6_fl_purge(struct net *net) 15860e8fbc4SBenjamin Thery { 15960e8fbc4SBenjamin Thery int i; 16060e8fbc4SBenjamin Thery 16160e8fbc4SBenjamin Thery write_lock(&ip6_fl_lock); 16260e8fbc4SBenjamin Thery for (i = 0; i <= FL_HASH_MASK; i++) { 16360e8fbc4SBenjamin Thery struct ip6_flowlabel *fl, **flp; 16460e8fbc4SBenjamin Thery flp = &fl_ht[i]; 16560e8fbc4SBenjamin Thery while ((fl = *flp) != NULL) { 16660e8fbc4SBenjamin Thery if (fl->fl_net == net && atomic_read(&fl->users) == 0) { 16760e8fbc4SBenjamin Thery *flp = fl->next; 16860e8fbc4SBenjamin Thery fl_free(fl); 16960e8fbc4SBenjamin Thery atomic_dec(&fl_size); 17060e8fbc4SBenjamin Thery continue; 17160e8fbc4SBenjamin Thery } 17260e8fbc4SBenjamin Thery flp = &fl->next; 17360e8fbc4SBenjamin Thery } 17460e8fbc4SBenjamin Thery } 17560e8fbc4SBenjamin Thery write_unlock(&ip6_fl_lock); 17660e8fbc4SBenjamin Thery } 17760e8fbc4SBenjamin Thery 17860e8fbc4SBenjamin Thery static struct ip6_flowlabel *fl_intern(struct net *net, 17960e8fbc4SBenjamin Thery struct ip6_flowlabel *fl, __be32 label) 1801da177e4SLinus Torvalds { 18178c2e502SPavel Emelyanov struct ip6_flowlabel *lfl; 18278c2e502SPavel Emelyanov 1831da177e4SLinus Torvalds fl->label = label & IPV6_FLOWLABEL_MASK; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds write_lock_bh(&ip6_fl_lock); 1861da177e4SLinus Torvalds if (label == 0) { 1871da177e4SLinus Torvalds for (;;) { 1881da177e4SLinus Torvalds fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; 1891da177e4SLinus Torvalds if (fl->label) { 19060e8fbc4SBenjamin Thery lfl = __fl_lookup(net, fl->label); 1911da177e4SLinus Torvalds if (lfl == NULL) 1921da177e4SLinus Torvalds break; 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds } 19578c2e502SPavel Emelyanov } else { 19678c2e502SPavel Emelyanov /* 19778c2e502SPavel Emelyanov * we dropper the ip6_fl_lock, so this entry could reappear 19878c2e502SPavel Emelyanov * and we need to recheck with it. 19978c2e502SPavel Emelyanov * 20078c2e502SPavel Emelyanov * OTOH no need to search the active socket first, like it is 20178c2e502SPavel Emelyanov * done in ipv6_flowlabel_opt - sock is locked, so new entry 20278c2e502SPavel Emelyanov * with the same label can only appear on another sock 20378c2e502SPavel Emelyanov */ 20460e8fbc4SBenjamin Thery lfl = __fl_lookup(net, fl->label); 20578c2e502SPavel Emelyanov if (lfl != NULL) { 20678c2e502SPavel Emelyanov atomic_inc(&lfl->users); 20778c2e502SPavel Emelyanov write_unlock_bh(&ip6_fl_lock); 20878c2e502SPavel Emelyanov return lfl; 20978c2e502SPavel Emelyanov } 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds fl->lastuse = jiffies; 2131da177e4SLinus Torvalds fl->next = fl_ht[FL_HASH(fl->label)]; 2141da177e4SLinus Torvalds fl_ht[FL_HASH(fl->label)] = fl; 2151da177e4SLinus Torvalds atomic_inc(&fl_size); 2161da177e4SLinus Torvalds write_unlock_bh(&ip6_fl_lock); 21778c2e502SPavel Emelyanov return NULL; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds /* Socket flowlabel lists */ 2231da177e4SLinus Torvalds 22490bcaf7bSAl Viro struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) 2251da177e4SLinus Torvalds { 2261da177e4SLinus Torvalds struct ipv6_fl_socklist *sfl; 2271da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds label &= IPV6_FLOWLABEL_MASK; 2301da177e4SLinus Torvalds 231bd0bf577SPavel Emelyanov read_lock_bh(&ip6_sk_fl_lock); 2321da177e4SLinus Torvalds for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { 2331da177e4SLinus Torvalds struct ip6_flowlabel *fl = sfl->fl; 2341da177e4SLinus Torvalds if (fl->label == label) { 2351da177e4SLinus Torvalds fl->lastuse = jiffies; 2361da177e4SLinus Torvalds atomic_inc(&fl->users); 23752f095eeSPavel Emelyanov read_unlock_bh(&ip6_sk_fl_lock); 2381da177e4SLinus Torvalds return fl; 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds } 241bd0bf577SPavel Emelyanov read_unlock_bh(&ip6_sk_fl_lock); 2421da177e4SLinus Torvalds return NULL; 2431da177e4SLinus Torvalds } 2441da177e4SLinus Torvalds 2453cf3dc6cSArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(fl6_sock_lookup); 2463cf3dc6cSArnaldo Carvalho de Melo 2471da177e4SLinus Torvalds void fl6_free_socklist(struct sock *sk) 2481da177e4SLinus Torvalds { 2491da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2501da177e4SLinus Torvalds struct ipv6_fl_socklist *sfl; 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds while ((sfl = np->ipv6_fl_list) != NULL) { 2531da177e4SLinus Torvalds np->ipv6_fl_list = sfl->next; 2541da177e4SLinus Torvalds fl_release(sfl->fl); 2551da177e4SLinus Torvalds kfree(sfl); 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds /* Service routines */ 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds /* 2631da177e4SLinus Torvalds It is the only difficult place. flowlabel enforces equal headers 2641da177e4SLinus Torvalds before and including routing header, however user may supply options 2651da177e4SLinus Torvalds following rthdr. 2661da177e4SLinus Torvalds */ 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 2691da177e4SLinus Torvalds struct ip6_flowlabel * fl, 2701da177e4SLinus Torvalds struct ipv6_txoptions * fopt) 2711da177e4SLinus Torvalds { 272df9890c3SYOSHIFUJI Hideaki struct ipv6_txoptions * fl_opt = fl->opt; 2731da177e4SLinus Torvalds 274df9890c3SYOSHIFUJI Hideaki if (fopt == NULL || fopt->opt_flen == 0) 2751da177e4SLinus Torvalds return fl_opt; 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds if (fl_opt != NULL) { 2781da177e4SLinus Torvalds opt_space->hopopt = fl_opt->hopopt; 279df9890c3SYOSHIFUJI Hideaki opt_space->dst0opt = fl_opt->dst0opt; 2801da177e4SLinus Torvalds opt_space->srcrt = fl_opt->srcrt; 2811da177e4SLinus Torvalds opt_space->opt_nflen = fl_opt->opt_nflen; 2821da177e4SLinus Torvalds } else { 2831da177e4SLinus Torvalds if (fopt->opt_nflen == 0) 2841da177e4SLinus Torvalds return fopt; 2851da177e4SLinus Torvalds opt_space->hopopt = NULL; 2861da177e4SLinus Torvalds opt_space->dst0opt = NULL; 2871da177e4SLinus Torvalds opt_space->srcrt = NULL; 2881da177e4SLinus Torvalds opt_space->opt_nflen = 0; 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds opt_space->dst1opt = fopt->dst1opt; 2911da177e4SLinus Torvalds opt_space->opt_flen = fopt->opt_flen; 2921da177e4SLinus Torvalds return opt_space; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds static unsigned long check_linger(unsigned long ttl) 2961da177e4SLinus Torvalds { 2971da177e4SLinus Torvalds if (ttl < FL_MIN_LINGER) 2981da177e4SLinus Torvalds return FL_MIN_LINGER*HZ; 2991da177e4SLinus Torvalds if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) 3001da177e4SLinus Torvalds return 0; 3011da177e4SLinus Torvalds return ttl*HZ; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) 3051da177e4SLinus Torvalds { 3061da177e4SLinus Torvalds linger = check_linger(linger); 3071da177e4SLinus Torvalds if (!linger) 3081da177e4SLinus Torvalds return -EPERM; 3091da177e4SLinus Torvalds expires = check_linger(expires); 3101da177e4SLinus Torvalds if (!expires) 3111da177e4SLinus Torvalds return -EPERM; 3121da177e4SLinus Torvalds fl->lastuse = jiffies; 3131da177e4SLinus Torvalds if (time_before(fl->linger, linger)) 3141da177e4SLinus Torvalds fl->linger = linger; 3151da177e4SLinus Torvalds if (time_before(expires, fl->linger)) 3161da177e4SLinus Torvalds expires = fl->linger; 3171da177e4SLinus Torvalds if (time_before(fl->expires, fl->lastuse + expires)) 3181da177e4SLinus Torvalds fl->expires = fl->lastuse + expires; 3191da177e4SLinus Torvalds return 0; 3201da177e4SLinus Torvalds } 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds static struct ip6_flowlabel * 32360e8fbc4SBenjamin Thery fl_create(struct net *net, struct in6_flowlabel_req *freq, char __user *optval, 32460e8fbc4SBenjamin Thery int optlen, int *err_p) 3251da177e4SLinus Torvalds { 3261da177e4SLinus Torvalds struct ip6_flowlabel *fl; 3271da177e4SLinus Torvalds int olen; 3281da177e4SLinus Torvalds int addr_type; 3291da177e4SLinus Torvalds int err; 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds err = -ENOMEM; 3320c600edaSIngo Oeser fl = kzalloc(sizeof(*fl), GFP_KERNEL); 3331da177e4SLinus Torvalds if (fl == NULL) 3341da177e4SLinus Torvalds goto done; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds olen = optlen - CMSG_ALIGN(sizeof(*freq)); 3371da177e4SLinus Torvalds if (olen > 0) { 3381da177e4SLinus Torvalds struct msghdr msg; 3391da177e4SLinus Torvalds struct flowi flowi; 3401da177e4SLinus Torvalds int junk; 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds err = -ENOMEM; 3431da177e4SLinus Torvalds fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); 3441da177e4SLinus Torvalds if (fl->opt == NULL) 3451da177e4SLinus Torvalds goto done; 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds memset(fl->opt, 0, sizeof(*fl->opt)); 3481da177e4SLinus Torvalds fl->opt->tot_len = sizeof(*fl->opt) + olen; 3491da177e4SLinus Torvalds err = -EFAULT; 3501da177e4SLinus Torvalds if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) 3511da177e4SLinus Torvalds goto done; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds msg.msg_controllen = olen; 3541da177e4SLinus Torvalds msg.msg_control = (void*)(fl->opt+1); 3551da177e4SLinus Torvalds flowi.oif = 0; 3561da177e4SLinus Torvalds 35791e1908fSYOSHIFUJI Hideaki err = datagram_send_ctl(net, &msg, &flowi, fl->opt, &junk, &junk); 3581da177e4SLinus Torvalds if (err) 3591da177e4SLinus Torvalds goto done; 3601da177e4SLinus Torvalds err = -EINVAL; 3611da177e4SLinus Torvalds if (fl->opt->opt_flen) 3621da177e4SLinus Torvalds goto done; 3631da177e4SLinus Torvalds if (fl->opt->opt_nflen == 0) { 3641da177e4SLinus Torvalds kfree(fl->opt); 3651da177e4SLinus Torvalds fl->opt = NULL; 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 36960e8fbc4SBenjamin Thery fl->fl_net = hold_net(net); 3701da177e4SLinus Torvalds fl->expires = jiffies; 3711da177e4SLinus Torvalds err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); 3721da177e4SLinus Torvalds if (err) 3731da177e4SLinus Torvalds goto done; 3741da177e4SLinus Torvalds fl->share = freq->flr_share; 3751da177e4SLinus Torvalds addr_type = ipv6_addr_type(&freq->flr_dst); 3761da177e4SLinus Torvalds if ((addr_type&IPV6_ADDR_MAPPED) 377c6817e4cSJames Morris || addr_type == IPV6_ADDR_ANY) { 378c6817e4cSJames Morris err = -EINVAL; 3791da177e4SLinus Torvalds goto done; 380c6817e4cSJames Morris } 3811da177e4SLinus Torvalds ipv6_addr_copy(&fl->dst, &freq->flr_dst); 3821da177e4SLinus Torvalds atomic_set(&fl->users, 1); 3831da177e4SLinus Torvalds switch (fl->share) { 3841da177e4SLinus Torvalds case IPV6_FL_S_EXCL: 3851da177e4SLinus Torvalds case IPV6_FL_S_ANY: 3861da177e4SLinus Torvalds break; 3871da177e4SLinus Torvalds case IPV6_FL_S_PROCESS: 3881da177e4SLinus Torvalds fl->owner = current->pid; 3891da177e4SLinus Torvalds break; 3901da177e4SLinus Torvalds case IPV6_FL_S_USER: 3911da177e4SLinus Torvalds fl->owner = current->euid; 3921da177e4SLinus Torvalds break; 3931da177e4SLinus Torvalds default: 3941da177e4SLinus Torvalds err = -EINVAL; 3951da177e4SLinus Torvalds goto done; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds return fl; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds done: 4001da177e4SLinus Torvalds fl_free(fl); 4011da177e4SLinus Torvalds *err_p = err; 4021da177e4SLinus Torvalds return NULL; 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds static int mem_check(struct sock *sk) 4061da177e4SLinus Torvalds { 4071da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4081da177e4SLinus Torvalds struct ipv6_fl_socklist *sfl; 4091da177e4SLinus Torvalds int room = FL_MAX_SIZE - atomic_read(&fl_size); 4101da177e4SLinus Torvalds int count = 0; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) 4131da177e4SLinus Torvalds return 0; 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) 4161da177e4SLinus Torvalds count++; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds if (room <= 0 || 4191da177e4SLinus Torvalds ((count >= FL_MAX_PER_SOCK || 4201da177e4SLinus Torvalds (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) 4211da177e4SLinus Torvalds && !capable(CAP_NET_ADMIN))) 4221da177e4SLinus Torvalds return -ENOBUFS; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds return 0; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) 4281da177e4SLinus Torvalds { 4291da177e4SLinus Torvalds if (h1 == h2) 4301da177e4SLinus Torvalds return 0; 4311da177e4SLinus Torvalds if (h1 == NULL || h2 == NULL) 4321da177e4SLinus Torvalds return 1; 4331da177e4SLinus Torvalds if (h1->hdrlen != h2->hdrlen) 4341da177e4SLinus Torvalds return 1; 4351da177e4SLinus Torvalds return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) 4391da177e4SLinus Torvalds { 4401da177e4SLinus Torvalds if (o1 == o2) 4411da177e4SLinus Torvalds return 0; 4421da177e4SLinus Torvalds if (o1 == NULL || o2 == NULL) 4431da177e4SLinus Torvalds return 1; 4441da177e4SLinus Torvalds if (o1->opt_nflen != o2->opt_nflen) 4451da177e4SLinus Torvalds return 1; 4461da177e4SLinus Torvalds if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) 4471da177e4SLinus Torvalds return 1; 4481da177e4SLinus Torvalds if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) 4491da177e4SLinus Torvalds return 1; 4501da177e4SLinus Torvalds if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) 4511da177e4SLinus Torvalds return 1; 4521da177e4SLinus Torvalds return 0; 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 45504028045SPavel Emelyanov static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, 45604028045SPavel Emelyanov struct ip6_flowlabel *fl) 45704028045SPavel Emelyanov { 45804028045SPavel Emelyanov write_lock_bh(&ip6_sk_fl_lock); 45904028045SPavel Emelyanov sfl->fl = fl; 46004028045SPavel Emelyanov sfl->next = np->ipv6_fl_list; 46104028045SPavel Emelyanov np->ipv6_fl_list = sfl; 46204028045SPavel Emelyanov write_unlock_bh(&ip6_sk_fl_lock); 46304028045SPavel Emelyanov } 46404028045SPavel Emelyanov 4651da177e4SLinus Torvalds int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) 4661da177e4SLinus Torvalds { 46755205d40SIngo Molnar int uninitialized_var(err); 46860e8fbc4SBenjamin Thery struct net *net = sock_net(sk); 4691da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4701da177e4SLinus Torvalds struct in6_flowlabel_req freq; 4711da177e4SLinus Torvalds struct ipv6_fl_socklist *sfl1=NULL; 4721da177e4SLinus Torvalds struct ipv6_fl_socklist *sfl, **sflp; 47378c2e502SPavel Emelyanov struct ip6_flowlabel *fl, *fl1 = NULL; 47478c2e502SPavel Emelyanov 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds if (optlen < sizeof(freq)) 4771da177e4SLinus Torvalds return -EINVAL; 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds if (copy_from_user(&freq, optval, sizeof(freq))) 4801da177e4SLinus Torvalds return -EFAULT; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds switch (freq.flr_action) { 4831da177e4SLinus Torvalds case IPV6_FL_A_PUT: 4841da177e4SLinus Torvalds write_lock_bh(&ip6_sk_fl_lock); 4851da177e4SLinus Torvalds for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { 4861da177e4SLinus Torvalds if (sfl->fl->label == freq.flr_label) { 4871da177e4SLinus Torvalds if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) 4881da177e4SLinus Torvalds np->flow_label &= ~IPV6_FLOWLABEL_MASK; 4891da177e4SLinus Torvalds *sflp = sfl->next; 4901da177e4SLinus Torvalds write_unlock_bh(&ip6_sk_fl_lock); 4911da177e4SLinus Torvalds fl_release(sfl->fl); 4921da177e4SLinus Torvalds kfree(sfl); 4931da177e4SLinus Torvalds return 0; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds write_unlock_bh(&ip6_sk_fl_lock); 4971da177e4SLinus Torvalds return -ESRCH; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds case IPV6_FL_A_RENEW: 5001da177e4SLinus Torvalds read_lock_bh(&ip6_sk_fl_lock); 5011da177e4SLinus Torvalds for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 5021da177e4SLinus Torvalds if (sfl->fl->label == freq.flr_label) { 5031da177e4SLinus Torvalds err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); 5041da177e4SLinus Torvalds read_unlock_bh(&ip6_sk_fl_lock); 5051da177e4SLinus Torvalds return err; 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds read_unlock_bh(&ip6_sk_fl_lock); 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { 51160e8fbc4SBenjamin Thery fl = fl_lookup(net, freq.flr_label); 5121da177e4SLinus Torvalds if (fl) { 5131da177e4SLinus Torvalds err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); 5141da177e4SLinus Torvalds fl_release(fl); 5151da177e4SLinus Torvalds return err; 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds return -ESRCH; 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds case IPV6_FL_A_GET: 5211da177e4SLinus Torvalds if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) 5221da177e4SLinus Torvalds return -EINVAL; 5231da177e4SLinus Torvalds 52460e8fbc4SBenjamin Thery fl = fl_create(net, &freq, optval, optlen, &err); 5251da177e4SLinus Torvalds if (fl == NULL) 5261da177e4SLinus Torvalds return err; 5271da177e4SLinus Torvalds sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds if (freq.flr_label) { 5301da177e4SLinus Torvalds err = -EEXIST; 5311da177e4SLinus Torvalds read_lock_bh(&ip6_sk_fl_lock); 5321da177e4SLinus Torvalds for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { 5331da177e4SLinus Torvalds if (sfl->fl->label == freq.flr_label) { 5341da177e4SLinus Torvalds if (freq.flr_flags&IPV6_FL_F_EXCL) { 5351da177e4SLinus Torvalds read_unlock_bh(&ip6_sk_fl_lock); 5361da177e4SLinus Torvalds goto done; 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds fl1 = sfl->fl; 5394ea6a804SYan Zheng atomic_inc(&fl1->users); 5401da177e4SLinus Torvalds break; 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds read_unlock_bh(&ip6_sk_fl_lock); 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds if (fl1 == NULL) 54660e8fbc4SBenjamin Thery fl1 = fl_lookup(net, freq.flr_label); 5471da177e4SLinus Torvalds if (fl1) { 54878c2e502SPavel Emelyanov recheck: 5491da177e4SLinus Torvalds err = -EEXIST; 5501da177e4SLinus Torvalds if (freq.flr_flags&IPV6_FL_F_EXCL) 5511da177e4SLinus Torvalds goto release; 5521da177e4SLinus Torvalds err = -EPERM; 5531da177e4SLinus Torvalds if (fl1->share == IPV6_FL_S_EXCL || 5541da177e4SLinus Torvalds fl1->share != fl->share || 5551da177e4SLinus Torvalds fl1->owner != fl->owner) 5561da177e4SLinus Torvalds goto release; 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds err = -EINVAL; 5591da177e4SLinus Torvalds if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || 5601da177e4SLinus Torvalds ipv6_opt_cmp(fl1->opt, fl->opt)) 5611da177e4SLinus Torvalds goto release; 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds err = -ENOMEM; 5641da177e4SLinus Torvalds if (sfl1 == NULL) 5651da177e4SLinus Torvalds goto release; 5661da177e4SLinus Torvalds if (fl->linger > fl1->linger) 5671da177e4SLinus Torvalds fl1->linger = fl->linger; 5681da177e4SLinus Torvalds if ((long)(fl->expires - fl1->expires) > 0) 5691da177e4SLinus Torvalds fl1->expires = fl->expires; 57004028045SPavel Emelyanov fl_link(np, sfl1, fl1); 5711da177e4SLinus Torvalds fl_free(fl); 5721da177e4SLinus Torvalds return 0; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds release: 5751da177e4SLinus Torvalds fl_release(fl1); 5761da177e4SLinus Torvalds goto done; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds err = -ENOENT; 5801da177e4SLinus Torvalds if (!(freq.flr_flags&IPV6_FL_F_CREATE)) 5811da177e4SLinus Torvalds goto done; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds err = -ENOMEM; 5841da177e4SLinus Torvalds if (sfl1 == NULL || (err = mem_check(sk)) != 0) 5851da177e4SLinus Torvalds goto done; 5861da177e4SLinus Torvalds 58760e8fbc4SBenjamin Thery fl1 = fl_intern(net, fl, freq.flr_label); 58878c2e502SPavel Emelyanov if (fl1 != NULL) 58978c2e502SPavel Emelyanov goto recheck; 5901da177e4SLinus Torvalds 5916c94d361SDavid S. Miller if (!freq.flr_label) { 5926c94d361SDavid S. Miller if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, 5936c94d361SDavid S. Miller &fl->label, sizeof(fl->label))) { 5946c94d361SDavid S. Miller /* Intentionally ignore fault. */ 5956c94d361SDavid S. Miller } 5966c94d361SDavid S. Miller } 5971da177e4SLinus Torvalds 59804028045SPavel Emelyanov fl_link(np, sfl1, fl); 5991da177e4SLinus Torvalds return 0; 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds default: 6021da177e4SLinus Torvalds return -EINVAL; 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds done: 6061da177e4SLinus Torvalds fl_free(fl); 6071da177e4SLinus Torvalds kfree(sfl1); 6081da177e4SLinus Torvalds return err; 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds struct ip6fl_iter_state { 6145983a3dfSBenjamin Thery struct seq_net_private p; 6151da177e4SLinus Torvalds int bucket; 6161da177e4SLinus Torvalds }; 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) 6211da177e4SLinus Torvalds { 6221da177e4SLinus Torvalds struct ip6_flowlabel *fl = NULL; 6231da177e4SLinus Torvalds struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 6245983a3dfSBenjamin Thery struct net *net = seq_file_net(seq); 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { 6271da177e4SLinus Torvalds fl = fl_ht[state->bucket]; 6285983a3dfSBenjamin Thery 6295983a3dfSBenjamin Thery while (fl && fl->fl_net != net) 6305983a3dfSBenjamin Thery fl = fl->next; 6315983a3dfSBenjamin Thery if (fl) 6321da177e4SLinus Torvalds break; 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds return fl; 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) 6381da177e4SLinus Torvalds { 6391da177e4SLinus Torvalds struct ip6fl_iter_state *state = ip6fl_seq_private(seq); 6405983a3dfSBenjamin Thery struct net *net = seq_file_net(seq); 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds fl = fl->next; 6435983a3dfSBenjamin Thery try_again: 6445983a3dfSBenjamin Thery while (fl && fl->fl_net != net) 6455983a3dfSBenjamin Thery fl = fl->next; 6465983a3dfSBenjamin Thery 6471da177e4SLinus Torvalds while (!fl) { 6485983a3dfSBenjamin Thery if (++state->bucket <= FL_HASH_MASK) { 6491da177e4SLinus Torvalds fl = fl_ht[state->bucket]; 6505983a3dfSBenjamin Thery goto try_again; 6515983a3dfSBenjamin Thery } else 652bcd62075SJames Morris break; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds return fl; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) 6581da177e4SLinus Torvalds { 6591da177e4SLinus Torvalds struct ip6_flowlabel *fl = ip6fl_get_first(seq); 6601da177e4SLinus Torvalds if (fl) 6611da177e4SLinus Torvalds while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) 6621da177e4SLinus Torvalds --pos; 6631da177e4SLinus Torvalds return pos ? NULL : fl; 6641da177e4SLinus Torvalds } 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) 6679a429c49SEric Dumazet __acquires(ip6_fl_lock) 6681da177e4SLinus Torvalds { 6691da177e4SLinus Torvalds read_lock_bh(&ip6_fl_lock); 6701da177e4SLinus Torvalds return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) 6741da177e4SLinus Torvalds { 6751da177e4SLinus Torvalds struct ip6_flowlabel *fl; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds if (v == SEQ_START_TOKEN) 6781da177e4SLinus Torvalds fl = ip6fl_get_first(seq); 6791da177e4SLinus Torvalds else 6801da177e4SLinus Torvalds fl = ip6fl_get_next(seq, v); 6811da177e4SLinus Torvalds ++*pos; 6821da177e4SLinus Torvalds return fl; 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds static void ip6fl_seq_stop(struct seq_file *seq, void *v) 6869a429c49SEric Dumazet __releases(ip6_fl_lock) 6871da177e4SLinus Torvalds { 6881da177e4SLinus Torvalds read_unlock_bh(&ip6_fl_lock); 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds 6911b7c2dbcSJames Morris static int ip6fl_seq_show(struct seq_file *seq, void *v) 6921da177e4SLinus Torvalds { 6931b7c2dbcSJames Morris if (v == SEQ_START_TOKEN) 6941b7c2dbcSJames Morris seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", 6951b7c2dbcSJames Morris "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); 6961b7c2dbcSJames Morris else { 6971b7c2dbcSJames Morris struct ip6_flowlabel *fl = v; 6981da177e4SLinus Torvalds seq_printf(seq, 6994b7a4274SHarvey Harrison "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", 7001da177e4SLinus Torvalds (unsigned)ntohl(fl->label), 7011da177e4SLinus Torvalds fl->share, 7021da177e4SLinus Torvalds (unsigned)fl->owner, 7031da177e4SLinus Torvalds atomic_read(&fl->users), 7041da177e4SLinus Torvalds fl->linger/HZ, 7051da177e4SLinus Torvalds (long)(fl->expires - jiffies)/HZ, 706b071195dSHarvey Harrison &fl->dst, 7071da177e4SLinus Torvalds fl->opt ? fl->opt->opt_nflen : 0); 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds return 0; 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 71256b3d975SPhilippe De Muyter static const struct seq_operations ip6fl_seq_ops = { 7131da177e4SLinus Torvalds .start = ip6fl_seq_start, 7141da177e4SLinus Torvalds .next = ip6fl_seq_next, 7151da177e4SLinus Torvalds .stop = ip6fl_seq_stop, 7161da177e4SLinus Torvalds .show = ip6fl_seq_show, 7171da177e4SLinus Torvalds }; 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds static int ip6fl_seq_open(struct inode *inode, struct file *file) 7201da177e4SLinus Torvalds { 7215983a3dfSBenjamin Thery return seq_open_net(inode, file, &ip6fl_seq_ops, 722cf7732e4SPavel Emelyanov sizeof(struct ip6fl_iter_state)); 7231da177e4SLinus Torvalds } 7241da177e4SLinus Torvalds 7259a32144eSArjan van de Ven static const struct file_operations ip6fl_seq_fops = { 7261da177e4SLinus Torvalds .owner = THIS_MODULE, 7271da177e4SLinus Torvalds .open = ip6fl_seq_open, 7281da177e4SLinus Torvalds .read = seq_read, 7291da177e4SLinus Torvalds .llseek = seq_lseek, 7305983a3dfSBenjamin Thery .release = seq_release_net, 7311da177e4SLinus Torvalds }; 7321da177e4SLinus Torvalds 7330a3e78acSDaniel Lezcano static int ip6_flowlabel_proc_init(struct net *net) 7341da177e4SLinus Torvalds { 7355983a3dfSBenjamin Thery if (!proc_net_fops_create(net, "ip6_flowlabel", 7365983a3dfSBenjamin Thery S_IRUGO, &ip6fl_seq_fops)) 7370a3e78acSDaniel Lezcano return -ENOMEM; 7380a3e78acSDaniel Lezcano return 0; 7390a3e78acSDaniel Lezcano } 7400a3e78acSDaniel Lezcano 7410a3e78acSDaniel Lezcano static void ip6_flowlabel_proc_fini(struct net *net) 7420a3e78acSDaniel Lezcano { 7430a3e78acSDaniel Lezcano proc_net_remove(net, "ip6_flowlabel"); 7440a3e78acSDaniel Lezcano } 7450a3e78acSDaniel Lezcano #else 7460a3e78acSDaniel Lezcano static inline int ip6_flowlabel_proc_init(struct net *net) 7470a3e78acSDaniel Lezcano { 7480a3e78acSDaniel Lezcano return 0; 7490a3e78acSDaniel Lezcano } 7500a3e78acSDaniel Lezcano static inline void ip6_flowlabel_proc_fini(struct net *net) 7510a3e78acSDaniel Lezcano { 7520a3e78acSDaniel Lezcano return ; 7530a3e78acSDaniel Lezcano } 7541da177e4SLinus Torvalds #endif 7550a3e78acSDaniel Lezcano 75660e8fbc4SBenjamin Thery static inline void ip6_flowlabel_net_exit(struct net *net) 75760e8fbc4SBenjamin Thery { 75860e8fbc4SBenjamin Thery ip6_fl_purge(net); 7595983a3dfSBenjamin Thery ip6_flowlabel_proc_fini(net); 76060e8fbc4SBenjamin Thery } 76160e8fbc4SBenjamin Thery 76260e8fbc4SBenjamin Thery static struct pernet_operations ip6_flowlabel_net_ops = { 7635983a3dfSBenjamin Thery .init = ip6_flowlabel_proc_init, 76460e8fbc4SBenjamin Thery .exit = ip6_flowlabel_net_exit, 76560e8fbc4SBenjamin Thery }; 76660e8fbc4SBenjamin Thery 7670a3e78acSDaniel Lezcano int ip6_flowlabel_init(void) 7680a3e78acSDaniel Lezcano { 7695983a3dfSBenjamin Thery return register_pernet_subsys(&ip6_flowlabel_net_ops); 7701da177e4SLinus Torvalds } 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds void ip6_flowlabel_cleanup(void) 7731da177e4SLinus Torvalds { 7741da177e4SLinus Torvalds del_timer(&ip6_fl_gc_timer); 77560e8fbc4SBenjamin Thery unregister_pernet_subsys(&ip6_flowlabel_net_ops); 7761da177e4SLinus Torvalds } 777