123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889 |
- /*
- * 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/in6.h>
- #include <linux/proc_fs.h>
- #include <linux/seq_file.h>
- #include <linux/slab.h>
- #include <linux/export.h>
- #include <linux/pid_namespace.h>
- #include <net/net_namespace.h>
- #include <net/sock.h>
- #include <net/ipv6.h>
- #include <net/rawv6.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 150 /* 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 __rcu *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_SPINLOCK(ip6_fl_lock);
- /* Big socket sock */
- static DEFINE_SPINLOCK(ip6_sk_fl_lock);
- #define for_each_fl_rcu(hash, fl) \
- for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
- fl != NULL; \
- fl = rcu_dereference_bh(fl->next))
- #define for_each_fl_continue_rcu(fl) \
- for (fl = rcu_dereference_bh(fl->next); \
- fl != NULL; \
- fl = rcu_dereference_bh(fl->next))
- #define for_each_sk_fl_rcu(np, sfl) \
- for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \
- sfl != NULL; \
- sfl = rcu_dereference_bh(sfl->next))
- static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
- {
- struct ip6_flowlabel *fl;
- for_each_fl_rcu(FL_HASH(label), fl) {
- if (fl->label == label && net_eq(fl->fl_net, net))
- return fl;
- }
- return NULL;
- }
- static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
- {
- struct ip6_flowlabel *fl;
- rcu_read_lock_bh();
- fl = __fl_lookup(net, label);
- if (fl && !atomic_inc_not_zero(&fl->users))
- fl = NULL;
- rcu_read_unlock_bh();
- return fl;
- }
- static void fl_free(struct ip6_flowlabel *fl)
- {
- if (fl) {
- if (fl->share == IPV6_FL_S_PROCESS)
- put_pid(fl->owner.pid);
- kfree(fl->opt);
- kfree_rcu(fl, rcu);
- }
- }
- static void fl_release(struct ip6_flowlabel *fl)
- {
- spin_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);
- }
- spin_unlock_bh(&ip6_fl_lock);
- }
- static void ip6_fl_gc(unsigned long dummy)
- {
- int i;
- unsigned long now = jiffies;
- unsigned long sched = 0;
- spin_lock(&ip6_fl_lock);
- for (i = 0; i <= FL_HASH_MASK; i++) {
- struct ip6_flowlabel *fl;
- struct ip6_flowlabel __rcu **flp;
- flp = &fl_ht[i];
- while ((fl = rcu_dereference_protected(*flp,
- lockdep_is_held(&ip6_fl_lock))) != 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) {
- mod_timer(&ip6_fl_gc_timer, sched);
- }
- spin_unlock(&ip6_fl_lock);
- }
- static void __net_exit ip6_fl_purge(struct net *net)
- {
- int i;
- spin_lock_bh(&ip6_fl_lock);
- for (i = 0; i <= FL_HASH_MASK; i++) {
- struct ip6_flowlabel *fl;
- struct ip6_flowlabel __rcu **flp;
- flp = &fl_ht[i];
- while ((fl = rcu_dereference_protected(*flp,
- lockdep_is_held(&ip6_fl_lock))) != NULL) {
- if (net_eq(fl->fl_net, net) &&
- atomic_read(&fl->users) == 0) {
- *flp = fl->next;
- fl_free(fl);
- atomic_dec(&fl_size);
- continue;
- }
- flp = &fl->next;
- }
- }
- spin_unlock_bh(&ip6_fl_lock);
- }
- static struct ip6_flowlabel *fl_intern(struct net *net,
- struct ip6_flowlabel *fl, __be32 label)
- {
- struct ip6_flowlabel *lfl;
- fl->label = label & IPV6_FLOWLABEL_MASK;
- spin_lock_bh(&ip6_fl_lock);
- if (label == 0) {
- for (;;) {
- fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK;
- if (fl->label) {
- lfl = __fl_lookup(net, fl->label);
- if (!lfl)
- 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(net, fl->label);
- if (lfl) {
- atomic_inc(&lfl->users);
- spin_unlock_bh(&ip6_fl_lock);
- return lfl;
- }
- }
- fl->lastuse = jiffies;
- fl->next = fl_ht[FL_HASH(fl->label)];
- rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
- atomic_inc(&fl_size);
- spin_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;
- rcu_read_lock_bh();
- for_each_sk_fl_rcu(np, sfl) {
- struct ip6_flowlabel *fl = sfl->fl;
- if (fl->label == label) {
- fl->lastuse = jiffies;
- atomic_inc(&fl->users);
- rcu_read_unlock_bh();
- return fl;
- }
- }
- rcu_read_unlock_bh();
- 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;
- if (!rcu_access_pointer(np->ipv6_fl_list))
- return;
- spin_lock_bh(&ip6_sk_fl_lock);
- while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
- lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
- np->ipv6_fl_list = sfl->next;
- spin_unlock_bh(&ip6_sk_fl_lock);
- fl_release(sfl->fl);
- kfree_rcu(sfl, rcu);
- spin_lock_bh(&ip6_sk_fl_lock);
- }
- spin_unlock_bh(&ip6_sk_fl_lock);
- }
- /* 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 || fopt->opt_flen == 0)
- return fl_opt;
- if (fl_opt) {
- 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;
- opt_space->tot_len = fopt->tot_len;
- return opt_space;
- }
- EXPORT_SYMBOL_GPL(fl6_merge_options);
- 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;
- spin_lock_bh(&ip6_fl_lock);
- 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;
- spin_unlock_bh(&ip6_fl_lock);
- return 0;
- }
- static struct ip6_flowlabel *
- fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
- char __user *optval, int optlen, int *err_p)
- {
- struct ip6_flowlabel *fl = NULL;
- int olen;
- int addr_type;
- int err;
- olen = optlen - CMSG_ALIGN(sizeof(*freq));
- err = -EINVAL;
- if (olen > 64 * 1024)
- goto done;
- err = -ENOMEM;
- fl = kzalloc(sizeof(*fl), GFP_KERNEL);
- if (!fl)
- goto done;
- if (olen > 0) {
- struct msghdr msg;
- struct flowi6 flowi6;
- struct sockcm_cookie sockc_junk;
- struct ipcm6_cookie ipc6;
- err = -ENOMEM;
- fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
- if (!fl->opt)
- 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);
- memset(&flowi6, 0, sizeof(flowi6));
- ipc6.opt = fl->opt;
- err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, &ipc6, &sockc_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->fl_net = net;
- 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;
- }
- 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.pid = get_task_pid(current, PIDTYPE_PID);
- break;
- case IPV6_FL_S_USER:
- fl->owner.uid = 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;
- rcu_read_lock_bh();
- for_each_sk_fl_rcu(np, sfl)
- count++;
- rcu_read_unlock_bh();
- 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 inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
- struct ip6_flowlabel *fl)
- {
- spin_lock_bh(&ip6_sk_fl_lock);
- sfl->fl = fl;
- sfl->next = np->ipv6_fl_list;
- rcu_assign_pointer(np->ipv6_fl_list, sfl);
- spin_unlock_bh(&ip6_sk_fl_lock);
- }
- int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
- int flags)
- {
- struct ipv6_pinfo *np = inet6_sk(sk);
- struct ipv6_fl_socklist *sfl;
- if (flags & IPV6_FL_F_REMOTE) {
- freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
- return 0;
- }
- if (np->repflow) {
- freq->flr_label = np->flow_label;
- return 0;
- }
- rcu_read_lock_bh();
- for_each_sk_fl_rcu(np, sfl) {
- if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
- spin_lock_bh(&ip6_fl_lock);
- freq->flr_label = sfl->fl->label;
- freq->flr_dst = sfl->fl->dst;
- freq->flr_share = sfl->fl->share;
- freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
- freq->flr_linger = sfl->fl->linger / HZ;
- spin_unlock_bh(&ip6_fl_lock);
- rcu_read_unlock_bh();
- return 0;
- }
- }
- rcu_read_unlock_bh();
- return -ENOENT;
- }
- int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
- {
- int uninitialized_var(err);
- struct net *net = sock_net(sk);
- struct ipv6_pinfo *np = inet6_sk(sk);
- struct in6_flowlabel_req freq;
- struct ipv6_fl_socklist *sfl1 = NULL;
- struct ipv6_fl_socklist *sfl;
- struct ipv6_fl_socklist __rcu **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:
- if (freq.flr_flags & IPV6_FL_F_REFLECT) {
- if (sk->sk_protocol != IPPROTO_TCP)
- return -ENOPROTOOPT;
- if (!np->repflow)
- return -ESRCH;
- np->flow_label = 0;
- np->repflow = 0;
- return 0;
- }
- spin_lock_bh(&ip6_sk_fl_lock);
- for (sflp = &np->ipv6_fl_list;
- (sfl = rcu_dereference_protected(*sflp,
- lockdep_is_held(&ip6_sk_fl_lock))) != 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;
- spin_unlock_bh(&ip6_sk_fl_lock);
- fl_release(sfl->fl);
- kfree_rcu(sfl, rcu);
- return 0;
- }
- }
- spin_unlock_bh(&ip6_sk_fl_lock);
- return -ESRCH;
- case IPV6_FL_A_RENEW:
- rcu_read_lock_bh();
- for_each_sk_fl_rcu(np, sfl) {
- if (sfl->fl->label == freq.flr_label) {
- err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
- rcu_read_unlock_bh();
- return err;
- }
- }
- rcu_read_unlock_bh();
- if (freq.flr_share == IPV6_FL_S_NONE &&
- ns_capable(net->user_ns, CAP_NET_ADMIN)) {
- fl = fl_lookup(net, 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_flags & IPV6_FL_F_REFLECT) {
- struct net *net = sock_net(sk);
- if (net->ipv6.sysctl.flowlabel_consistency) {
- net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
- return -EPERM;
- }
- if (sk->sk_protocol != IPPROTO_TCP)
- return -ENOPROTOOPT;
- np->repflow = 1;
- return 0;
- }
- if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
- return -EINVAL;
- if (net->ipv6.sysctl.flowlabel_state_ranges &&
- (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
- return -ERANGE;
- fl = fl_create(net, sk, &freq, optval, optlen, &err);
- if (!fl)
- return err;
- sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
- if (freq.flr_label) {
- err = -EEXIST;
- rcu_read_lock_bh();
- for_each_sk_fl_rcu(np, sfl) {
- if (sfl->fl->label == freq.flr_label) {
- if (freq.flr_flags&IPV6_FL_F_EXCL) {
- rcu_read_unlock_bh();
- goto done;
- }
- fl1 = sfl->fl;
- atomic_inc(&fl1->users);
- break;
- }
- }
- rcu_read_unlock_bh();
- if (!fl1)
- fl1 = fl_lookup(net, 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->share == IPV6_FL_S_PROCESS) &&
- (fl1->owner.pid == fl->owner.pid)) ||
- ((fl1->share == IPV6_FL_S_USER) &&
- uid_eq(fl1->owner.uid, fl->owner.uid)))
- goto release;
- err = -ENOMEM;
- if (!sfl1)
- 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)
- goto done;
- err = mem_check(sk);
- if (err != 0)
- goto done;
- fl1 = fl_intern(net, fl, freq.flr_label);
- if (fl1)
- 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 {
- struct seq_net_private p;
- struct pid_namespace *pid_ns;
- 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);
- struct net *net = seq_file_net(seq);
- for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
- for_each_fl_rcu(state->bucket, fl) {
- if (net_eq(fl->fl_net, net))
- goto out;
- }
- }
- fl = NULL;
- out:
- 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);
- struct net *net = seq_file_net(seq);
- for_each_fl_continue_rcu(fl) {
- if (net_eq(fl->fl_net, net))
- goto out;
- }
- try_again:
- if (++state->bucket <= FL_HASH_MASK) {
- for_each_fl_rcu(state->bucket, fl) {
- if (net_eq(fl->fl_net, net))
- goto out;
- }
- goto try_again;
- }
- fl = NULL;
- out:
- 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)
- __acquires(RCU)
- {
- rcu_read_lock_bh();
- 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)
- __releases(RCU)
- {
- rcu_read_unlock_bh();
- }
- static int ip6fl_seq_show(struct seq_file *seq, void *v)
- {
- struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
- if (v == SEQ_START_TOKEN) {
- seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n");
- } else {
- struct ip6_flowlabel *fl = v;
- seq_printf(seq,
- "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
- (unsigned int)ntohl(fl->label),
- fl->share,
- ((fl->share == IPV6_FL_S_PROCESS) ?
- pid_nr_ns(fl->owner.pid, state->pid_ns) :
- ((fl->share == IPV6_FL_S_USER) ?
- from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
- 0)),
- atomic_read(&fl->users),
- fl->linger/HZ,
- (long)(fl->expires - jiffies)/HZ,
- &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)
- {
- struct seq_file *seq;
- struct ip6fl_iter_state *state;
- int err;
- err = seq_open_net(inode, file, &ip6fl_seq_ops,
- sizeof(struct ip6fl_iter_state));
- if (!err) {
- seq = file->private_data;
- state = ip6fl_seq_private(seq);
- rcu_read_lock();
- state->pid_ns = get_pid_ns(task_active_pid_ns(current));
- rcu_read_unlock();
- }
- return err;
- }
- static int ip6fl_seq_release(struct inode *inode, struct file *file)
- {
- struct seq_file *seq = file->private_data;
- struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
- put_pid_ns(state->pid_ns);
- return seq_release_net(inode, file);
- }
- static const struct file_operations ip6fl_seq_fops = {
- .owner = THIS_MODULE,
- .open = ip6fl_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = ip6fl_seq_release,
- };
- static int __net_init ip6_flowlabel_proc_init(struct net *net)
- {
- if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
- &ip6fl_seq_fops))
- return -ENOMEM;
- return 0;
- }
- static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
- {
- remove_proc_entry("ip6_flowlabel", net->proc_net);
- }
- #else
- static inline int ip6_flowlabel_proc_init(struct net *net)
- {
- return 0;
- }
- static inline void ip6_flowlabel_proc_fini(struct net *net)
- {
- }
- #endif
- static void __net_exit ip6_flowlabel_net_exit(struct net *net)
- {
- ip6_fl_purge(net);
- ip6_flowlabel_proc_fini(net);
- }
- static struct pernet_operations ip6_flowlabel_net_ops = {
- .init = ip6_flowlabel_proc_init,
- .exit = ip6_flowlabel_net_exit,
- };
- int ip6_flowlabel_init(void)
- {
- return register_pernet_subsys(&ip6_flowlabel_net_ops);
- }
- void ip6_flowlabel_cleanup(void)
- {
- del_timer(&ip6_fl_gc_timer);
- unregister_pernet_subsys(&ip6_flowlabel_net_ops);
- }
|