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netfilter: xt_hashlimit: Create revision 2 to support higher pps rates 

Create a new revision for the hashlimit iptables extension module. Rev 2
will support higher pps of upto 1 million, Version 1 supports only 10k.

To support this we have to increase the size of the variables avg and
burst in hashlimit_cfg to 64-bit. Create two new structs hashlimit_cfg2
and xt_hashlimit_mtinfo2 and also create newer versions of all the
functions for match, checkentry and destroy.

Some of the functions like hashlimit_mt, hashlimit_mt_check etc are very
similar in both rev1 and rev2 with only minor changes, so I have split
those functions and moved all the common code to a *_common function.

Signed-off-by: Vishwanath Pai <vpai@akamai.com>
Signed-off-by: Joshua Hunt <johunt@akamai.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Vishwanath Pai 2016-09-22 12:43:44 -04:00 коммит произвёл Pablo Neira Ayuso
Родитель 0dc60a4546
Коммит 11d5f15723
2 изменённых файлов: 286 добавлений и 69 удалений
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23
include/uapi/linux/netfilter/xt_hashlimit.h
Просмотреть файл

@ -6,6 +6,7 @@
/* timings are in milliseconds. */
#define XT_HASHLIMIT_SCALE 10000
#define XT_HASHLIMIT_SCALE_v2 1000000llu
/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490
* seconds, or one packet every 59 hours.
*/
@ -63,6 +64,20 @@ struct hashlimit_cfg1 {
__u8 srcmask, dstmask;
};
struct hashlimit_cfg2 {
__u64 avg; /* Average secs between packets * scale */
__u64 burst; /* Period multiplier for upper limit. */
__u32 mode; /* bitmask of XT_HASHLIMIT_HASH_* */
/* user specified */
__u32 size; /* how many buckets */
__u32 max; /* max number of entries */
__u32 gc_interval; /* gc interval */
__u32 expire; /* when do entries expire? */
__u8 srcmask, dstmask;
};
struct xt_hashlimit_mtinfo1 {
char name[IFNAMSIZ];
struct hashlimit_cfg1 cfg;
@ -71,4 +86,12 @@ struct xt_hashlimit_mtinfo1 {
struct xt_hashlimit_htable *hinfo __attribute__((aligned(8)));
};
struct xt_hashlimit_mtinfo2 {
char name[NAME_MAX];
struct hashlimit_cfg2 cfg;
/* Used internally by the kernel */
struct xt_hashlimit_htable *hinfo __attribute__((aligned(8)));
};
#endif /* _UAPI_XT_HASHLIMIT_H */

332
net/netfilter/xt_hashlimit.c
Просмотреть файл

@ -57,6 +57,7 @@ static inline struct hashlimit_net *hashlimit_pernet(struct net *net)
/* need to declare this at the top */
static const struct file_operations dl_file_ops_v1;
static const struct file_operations dl_file_ops;
/* hash table crap */
struct dsthash_dst {
@ -86,8 +87,8 @@ struct dsthash_ent {
unsigned long expires; /* precalculated expiry time */
struct {
unsigned long prev; /* last modification */
u_int32_t credit;
u_int32_t credit_cap, cost;
u_int64_t credit;
u_int64_t credit_cap, cost;
} rateinfo;
struct rcu_head rcu;
};
@ -98,7 +99,7 @@ struct xt_hashlimit_htable {
u_int8_t family;
bool rnd_initialized;
struct hashlimit_cfg1 cfg; /* config */
struct hashlimit_cfg2 cfg; /* config */
/* used internally */
spinlock_t lock; /* lock for list_head */
@ -114,6 +115,30 @@ struct xt_hashlimit_htable {
struct hlist_head hash[0]; /* hashtable itself */
};
static int
cfg_copy(struct hashlimit_cfg2 *to, void *from, int revision)
{
if (revision == 1) {
struct hashlimit_cfg1 *cfg = (struct hashlimit_cfg1 *)from;
to->mode = cfg->mode;
to->avg = cfg->avg;
to->burst = cfg->burst;
to->size = cfg->size;
to->max = cfg->max;
to->gc_interval = cfg->gc_interval;
to->expire = cfg->expire;
to->srcmask = cfg->srcmask;
to->dstmask = cfg->dstmask;
} else if (revision == 2) {
memcpy(to, from, sizeof(struct hashlimit_cfg2));
} else {
return -EINVAL;
}
return 0;
}
static DEFINE_MUTEX(hashlimit_mutex); /* protects htables list */
static struct kmem_cache *hashlimit_cachep __read_mostly;
@ -215,16 +240,18 @@ dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent)
}
static void htable_gc(struct work_struct *work);
static int htable_create_v1(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
u_int8_t family)
static int htable_create(struct net *net, struct hashlimit_cfg2 *cfg,
const char *name, u_int8_t family,
struct xt_hashlimit_htable **out_hinfo,
int revision)
{
struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
struct xt_hashlimit_htable *hinfo;
unsigned int size;
unsigned int i;
unsigned int size, i;
int ret;
if (minfo->cfg.size) {
size = minfo->cfg.size;
if (cfg->size) {
size = cfg->size;
} else {
size = (totalram_pages << PAGE_SHIFT) / 16384 /
sizeof(struct list_head);
@ -238,10 +265,14 @@ static int htable_create_v1(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
sizeof(struct list_head) * size);
if (hinfo == NULL)
return -ENOMEM;
minfo->hinfo = hinfo;
*out_hinfo = hinfo;
/* copy match config into hashtable config */
memcpy(&hinfo->cfg, &minfo->cfg, sizeof(hinfo->cfg));
ret = cfg_copy(&hinfo->cfg, (void *)cfg, 2);
if (ret)
return ret;
hinfo->cfg.size = size;
if (hinfo->cfg.max == 0)
hinfo->cfg.max = 8 * hinfo->cfg.size;
@ -255,17 +286,18 @@ static int htable_create_v1(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
hinfo->count = 0;
hinfo->family = family;
hinfo->rnd_initialized = false;
hinfo->name = kstrdup(minfo->name, GFP_KERNEL);
hinfo->name = kstrdup(name, GFP_KERNEL);
if (!hinfo->name) {
vfree(hinfo);
return -ENOMEM;
}
spin_lock_init(&hinfo->lock);
hinfo->pde = proc_create_data(minfo->name, 0,
hinfo->pde = proc_create_data(name, 0,
(family == NFPROTO_IPV4) ?
hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit,
&dl_file_ops_v1, hinfo);
(revision == 1) ? &dl_file_ops_v1 : &dl_file_ops,
hinfo);
if (hinfo->pde == NULL) {
kfree(hinfo->name);
vfree(hinfo);
@ -399,6 +431,7 @@ static void htable_put(struct xt_hashlimit_htable *hinfo)
CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32 ie.
*/
#define MAX_CPJ_v1 (0xFFFFFFFF / (HZ*60*60*24))
#define MAX_CPJ (0xFFFFFFFFFFFFFFFF / (HZ*60*60*24))
/* Repeated shift and or gives us all 1s, final shift and add 1 gives
* us the power of 2 below the theoretical max, so GCC simply does a
@ -408,8 +441,11 @@ static void htable_put(struct xt_hashlimit_htable *hinfo)
#define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4))
#define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8))
#define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16))
#define _POW2_BELOW64(x) (_POW2_BELOW32(x)|_POW2_BELOW32((x)>>32))
#define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1)
#define POW2_BELOW64(x) ((_POW2_BELOW64(x)>>1) + 1)
#define CREDITS_PER_JIFFY POW2_BELOW64(MAX_CPJ)
#define CREDITS_PER_JIFFY_v1 POW2_BELOW32(MAX_CPJ_v1)
/* in byte mode, the lowest possible rate is one packet/second.
@ -425,15 +461,24 @@ static u32 xt_hashlimit_len_to_chunks(u32 len)
}
/* Precision saver. */
static u32 user2credits(u32 user)
static u64 user2credits(u64 user, int revision)
{
/* If multiplying would overflow... */
if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY_v1))
/* Divide first. */
return (user / XT_HASHLIMIT_SCALE) *\
HZ * CREDITS_PER_JIFFY_v1;
if (revision == 1) {
/* If multiplying would overflow... */
if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY_v1))
/* Divide first. */
return (user / XT_HASHLIMIT_SCALE) *\
HZ * CREDITS_PER_JIFFY_v1;
return (user * HZ * CREDITS_PER_JIFFY_v1) / XT_HASHLIMIT_SCALE;
return (user * HZ * CREDITS_PER_JIFFY_v1) \
/ XT_HASHLIMIT_SCALE;
} else {
if (user > 0xFFFFFFFFFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
return (user / XT_HASHLIMIT_SCALE_v2) *\
HZ * CREDITS_PER_JIFFY;
return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE_v2;
}
}
static u32 user2credits_byte(u32 user)
@ -443,10 +488,11 @@ static u32 user2credits_byte(u32 user)
return (u32) (us >> 32);
}
static void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now, u32 mode)
static void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now,
u32 mode, int revision)
{
unsigned long delta = now - dh->rateinfo.prev;
u32 cap;
u64 cap, cpj;
if (delta == 0)
return;
@ -454,7 +500,7 @@ static void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now, u32 mode)
dh->rateinfo.prev = now;
if (mode & XT_HASHLIMIT_BYTES) {
u32 tmp = dh->rateinfo.credit;
u64 tmp = dh->rateinfo.credit;
dh->rateinfo.credit += CREDITS_PER_JIFFY_BYTES * delta;
cap = CREDITS_PER_JIFFY_BYTES * HZ;
if (tmp >= dh->rateinfo.credit) {/* overflow */
@ -462,7 +508,9 @@ static void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now, u32 mode)
return;
}
} else {
dh->rateinfo.credit += delta * CREDITS_PER_JIFFY_v1;
cpj = (revision == 1) ?
CREDITS_PER_JIFFY_v1 : CREDITS_PER_JIFFY;
dh->rateinfo.credit += delta * cpj;
cap = dh->rateinfo.credit_cap;
}
if (dh->rateinfo.credit > cap)
@ -470,7 +518,7 @@ static void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now, u32 mode)
}
static void rateinfo_init(struct dsthash_ent *dh,
struct xt_hashlimit_htable *hinfo)
struct xt_hashlimit_htable *hinfo, int revision)
{
dh->rateinfo.prev = jiffies;
if (hinfo->cfg.mode & XT_HASHLIMIT_BYTES) {
@ -479,8 +527,8 @@ static void rateinfo_init(struct dsthash_ent *dh,
dh->rateinfo.credit_cap = hinfo->cfg.burst;
} else {
dh->rateinfo.credit = user2credits(hinfo->cfg.avg *
hinfo->cfg.burst);
dh->rateinfo.cost = user2credits(hinfo->cfg.avg);
hinfo->cfg.burst, revision);
dh->rateinfo.cost = user2credits(hinfo->cfg.avg, revision);
dh->rateinfo.credit_cap = dh->rateinfo.credit;
}
}
@ -604,15 +652,15 @@ static u32 hashlimit_byte_cost(unsigned int len, struct dsthash_ent *dh)
}
static bool
hashlimit_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
hashlimit_mt_common(const struct sk_buff *skb, struct xt_action_param *par,
struct xt_hashlimit_htable *hinfo,
const struct hashlimit_cfg2 *cfg, int revision)
{
const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
struct xt_hashlimit_htable *hinfo = info->hinfo;
unsigned long now = jiffies;
struct dsthash_ent *dh;
struct dsthash_dst dst;
bool race = false;
u32 cost;
u64 cost;
if (hashlimit_init_dst(hinfo, &dst, skb, par->thoff) < 0)
goto hotdrop;
@ -627,18 +675,18 @@ hashlimit_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
} else if (race) {
/* Already got an entry, update expiration timeout */
dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire);
rateinfo_recalc(dh, now, hinfo->cfg.mode);
rateinfo_recalc(dh, now, hinfo->cfg.mode, revision);
} else {
dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire);
rateinfo_init(dh, hinfo);
rateinfo_init(dh, hinfo, revision);
}
} else {
/* update expiration timeout */
dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire);
rateinfo_recalc(dh, now, hinfo->cfg.mode);
rateinfo_recalc(dh, now, hinfo->cfg.mode, revision);
}
if (info->cfg.mode & XT_HASHLIMIT_BYTES)
if (cfg->mode & XT_HASHLIMIT_BYTES)
cost = hashlimit_byte_cost(skb->len, dh);
else
cost = dh->rateinfo.cost;
@ -648,70 +696,126 @@ hashlimit_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
dh->rateinfo.credit -= cost;
spin_unlock(&dh->lock);
rcu_read_unlock_bh();
return !(info->cfg.mode & XT_HASHLIMIT_INVERT);
return !(cfg->mode & XT_HASHLIMIT_INVERT);
}
spin_unlock(&dh->lock);
rcu_read_unlock_bh();
/* default match is underlimit - so over the limit, we need to invert */
return info->cfg.mode & XT_HASHLIMIT_INVERT;
return cfg->mode & XT_HASHLIMIT_INVERT;
hotdrop:
par->hotdrop = true;
return false;
}
static int hashlimit_mt_check_v1(const struct xt_mtchk_param *par)
static bool
hashlimit_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
{
struct net *net = par->net;
struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
struct xt_hashlimit_htable *hinfo = info->hinfo;
struct hashlimit_cfg2 cfg = {};
int ret;
if (info->cfg.gc_interval == 0 || info->cfg.expire == 0)
return -EINVAL;
if (info->name[sizeof(info->name)-1] != '\0')
ret = cfg_copy(&cfg, (void *)&info->cfg, 1);
if (ret)
return ret;
return hashlimit_mt_common(skb, par, hinfo, &cfg, 1);
}
static bool
hashlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_hashlimit_mtinfo2 *info = par->matchinfo;
struct xt_hashlimit_htable *hinfo = info->hinfo;
return hashlimit_mt_common(skb, par, hinfo, &info->cfg, 2);
}
static int hashlimit_mt_check_common(const struct xt_mtchk_param *par,
struct xt_hashlimit_htable **hinfo,
struct hashlimit_cfg2 *cfg,
const char *name, int revision)
{
struct net *net = par->net;
int ret;
if (cfg->gc_interval == 0 || cfg->expire == 0)
return -EINVAL;
if (par->family == NFPROTO_IPV4) {
if (info->cfg.srcmask > 32 || info->cfg.dstmask > 32)
if (cfg->srcmask > 32 || cfg->dstmask > 32)
return -EINVAL;
} else {
if (info->cfg.srcmask > 128 || info->cfg.dstmask > 128)
if (cfg->srcmask > 128 || cfg->dstmask > 128)
return -EINVAL;
}
if (info->cfg.mode & ~XT_HASHLIMIT_ALL) {
if (cfg->mode & ~XT_HASHLIMIT_ALL) {
pr_info("Unknown mode mask %X, kernel too old?\n",
info->cfg.mode);
cfg->mode);
return -EINVAL;
}
/* Check for overflow. */
if (info->cfg.mode & XT_HASHLIMIT_BYTES) {
if (user2credits_byte(info->cfg.avg) == 0) {
pr_info("overflow, rate too high: %u\n", info->cfg.avg);
if (cfg->mode & XT_HASHLIMIT_BYTES) {
if (user2credits_byte(cfg->avg) == 0) {
pr_info("overflow, rate too high: %llu\n", cfg->avg);
return -EINVAL;
}
} else if (info->cfg.burst == 0 ||
user2credits(info->cfg.avg * info->cfg.burst) <
user2credits(info->cfg.avg)) {
pr_info("overflow, try lower: %u/%u\n",
info->cfg.avg, info->cfg.burst);
} else if (cfg->burst == 0 ||
user2credits(cfg->avg * cfg->burst, revision) <
user2credits(cfg->avg, revision)) {
pr_info("overflow, try lower: %llu/%llu\n",
cfg->avg, cfg->burst);
return -ERANGE;
}
mutex_lock(&hashlimit_mutex);
info->hinfo = htable_find_get(net, info->name, par->family);
if (info->hinfo == NULL) {
ret = htable_create_v1(net, info, par->family);
*hinfo = htable_find_get(net, name, par->family);
if (*hinfo == NULL) {
ret = htable_create(net, cfg, name, par->family,
hinfo, revision);
if (ret < 0) {
mutex_unlock(&hashlimit_mutex);
return ret;
}
}
mutex_unlock(&hashlimit_mutex);
return 0;
}
static int hashlimit_mt_check_v1(const struct xt_mtchk_param *par)
{
struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
struct hashlimit_cfg2 cfg = {};
int ret;
if (info->name[sizeof(info->name) - 1] != '\0')
return -EINVAL;
ret = cfg_copy(&cfg, (void *)&info->cfg, 1);
if (ret)
return ret;
return hashlimit_mt_check_common(par, &info->hinfo,
&cfg, info->name, 1);
}
static int hashlimit_mt_check(const struct xt_mtchk_param *par)
{
struct xt_hashlimit_mtinfo2 *info = par->matchinfo;
if (info->name[sizeof(info->name) - 1] != '\0')
return -EINVAL;
return hashlimit_mt_check_common(par, &info->hinfo, &info->cfg,
info->name, 2);
}
static void hashlimit_mt_destroy_v1(const struct xt_mtdtor_param *par)
{
const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
@ -719,6 +823,13 @@ static void hashlimit_mt_destroy_v1(const struct xt_mtdtor_param *par)
htable_put(info->hinfo);
}
static void hashlimit_mt_destroy(const struct xt_mtdtor_param *par)
{
const struct xt_hashlimit_mtinfo2 *info = par->matchinfo;
htable_put(info->hinfo);
}
static struct xt_match hashlimit_mt_reg[] __read_mostly = {
{
.name = "hashlimit",
@ -730,6 +841,16 @@ static struct xt_match hashlimit_mt_reg[] __read_mostly = {
.destroy = hashlimit_mt_destroy_v1,
.me = THIS_MODULE,
},
{
.name = "hashlimit",
.revision = 2,
.family = NFPROTO_IPV4,
.match = hashlimit_mt,
.matchsize = sizeof(struct xt_hashlimit_mtinfo2),
.checkentry = hashlimit_mt_check,
.destroy = hashlimit_mt_destroy,
.me = THIS_MODULE,
},
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
{
.name = "hashlimit",
@ -741,6 +862,16 @@ static struct xt_match hashlimit_mt_reg[] __read_mostly = {
.destroy = hashlimit_mt_destroy_v1,
.me = THIS_MODULE,
},
{
.name = "hashlimit",
.revision = 2,
.family = NFPROTO_IPV6,
.match = hashlimit_mt,
.matchsize = sizeof(struct xt_hashlimit_mtinfo2),
.checkentry = hashlimit_mt_check,
.destroy = hashlimit_mt_destroy,
.me = THIS_MODULE,
},
#endif
};
@ -787,18 +918,12 @@ static void dl_seq_stop(struct seq_file *s, void *v)
spin_unlock_bh(&htable->lock);
}
static int dl_seq_real_show_v1(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
static void dl_seq_print(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
const struct xt_hashlimit_htable *ht = s->private;
spin_lock(&ent->lock);
/* recalculate to show accurate numbers */
rateinfo_recalc(ent, jiffies, ht->cfg.mode);
switch (family) {
case NFPROTO_IPV4:
seq_printf(s, "%ld %pI4:%u->%pI4:%u %u %u %u\n",
seq_printf(s, "%ld %pI4:%u->%pI4:%u %llu %llu %llu\n",
(long)(ent->expires - jiffies)/HZ,
&ent->dst.ip.src,
ntohs(ent->dst.src_port),
@ -809,7 +934,7 @@ static int dl_seq_real_show_v1(struct dsthash_ent *ent, u_int8_t family,
break;
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
case NFPROTO_IPV6:
seq_printf(s, "%ld %pI6:%u->%pI6:%u %u %u %u\n",
seq_printf(s, "%ld %pI6:%u->%pI6:%u %llu %llu %llu\n",
(long)(ent->expires - jiffies)/HZ,
&ent->dst.ip6.src,
ntohs(ent->dst.src_port),
@ -822,6 +947,34 @@ static int dl_seq_real_show_v1(struct dsthash_ent *ent, u_int8_t family,
default:
BUG();
}
}
static int dl_seq_real_show_v1(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
const struct xt_hashlimit_htable *ht = s->private;
spin_lock(&ent->lock);
/* recalculate to show accurate numbers */
rateinfo_recalc(ent, jiffies, ht->cfg.mode, 1);
dl_seq_print(ent, family, s);
spin_unlock(&ent->lock);
return seq_has_overflowed(s);
}
static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
const struct xt_hashlimit_htable *ht = s->private;
spin_lock(&ent->lock);
/* recalculate to show accurate numbers */
rateinfo_recalc(ent, jiffies, ht->cfg.mode, 2);
dl_seq_print(ent, family, s);
spin_unlock(&ent->lock);
return seq_has_overflowed(s);
}
@ -840,6 +993,20 @@ static int dl_seq_show_v1(struct seq_file *s, void *v)
return 0;
}
static int dl_seq_show(struct seq_file *s, void *v)
{
struct xt_hashlimit_htable *htable = s->private;
unsigned int *bucket = (unsigned int *)v;
struct dsthash_ent *ent;
if (!hlist_empty(&htable->hash[*bucket])) {
hlist_for_each_entry(ent, &htable->hash[*bucket], node)
if (dl_seq_real_show(ent, htable->family, s))
return -1;
}
return 0;
}
static const struct seq_operations dl_seq_ops_v1 = {
.start = dl_seq_start,
.next = dl_seq_next,
@ -847,6 +1014,13 @@ static const struct seq_operations dl_seq_ops_v1 = {
.show = dl_seq_show_v1
};
static const struct seq_operations dl_seq_ops = {
.start = dl_seq_start,
.next = dl_seq_next,
.stop = dl_seq_stop,
.show = dl_seq_show
};
static int dl_proc_open_v1(struct inode *inode, struct file *file)
{
int ret = seq_open(file, &dl_seq_ops_v1);
@ -858,6 +1032,18 @@ static int dl_proc_open_v1(struct inode *inode, struct file *file)
return ret;
}
static int dl_proc_open(struct inode *inode, struct file *file)
{
int ret = seq_open(file, &dl_seq_ops);
if (!ret) {
struct seq_file *sf = file->private_data;
sf->private = PDE_DATA(inode);
}
return ret;
}
static const struct file_operations dl_file_ops_v1 = {
.owner = THIS_MODULE,
.open = dl_proc_open_v1,
@ -866,6 +1052,14 @@ static const struct file_operations dl_file_ops_v1 = {
.release = seq_release
};
static const struct file_operations dl_file_ops = {
.owner = THIS_MODULE,
.open = dl_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release
};
static int __net_init hashlimit_proc_net_init(struct net *net)
{
struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);