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Message-ID: <20160602001000.GA1644@akamai.com>
Date: Wed, 1 Jun 2016 20:10:00 -0400
From: Vishwanath Pai <vpai@...mai.com>
To: pablo@...filter.org, kaber@...sh.net, kadlec@...ckhole.kfki.hu,
netfilter-devel@...r.kernel.org
Cc: coreteam@...filter.org, johunt@...mai.com, netdev@...r.kernel.org
Subject: [PATCH 1/3] netfilter: Prepare xt_hashlimit.c for revision 2
netfilter: Prepare xt_hashlimit.c for revision 2
I am planning to add a revision 2 for the hashlimit xtables module to
support higher packets per second rates. This patch renames all the
functions and variables related to revision 1 by adding _v1 at the end of
the names.
Signed-off-by: Vishwanath Pai <vpai@...mai.com>
diff --git a/include/uapi/linux/netfilter/xt_hashlimit.h b/include/uapi/linux/netfilter/xt_hashlimit.h
index 6db9037..ea8c1c0 100644
--- a/include/uapi/linux/netfilter/xt_hashlimit.h
+++ b/include/uapi/linux/netfilter/xt_hashlimit.h
@@ -5,7 +5,7 @@
#include <linux/if.h>
/* timings are in milliseconds. */
-#define XT_HASHLIMIT_SCALE 10000
+#define XT_HASHLIMIT_SCALE_v1 10000
/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490
* seconds, or one packet every 59 hours.
*/
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 1786968..6b0ad93 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -56,7 +56,7 @@ 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;
+static const struct file_operations dl_file_ops_v1;
/* hash table crap */
struct dsthash_dst {
@@ -215,8 +215,8 @@ dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent)
}
static void htable_gc(struct work_struct *work);
-static int htable_create(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
- u_int8_t family)
+static int htable_create_v1(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
+ u_int8_t family)
{
struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
struct xt_hashlimit_htable *hinfo;
@@ -265,7 +265,7 @@ static int htable_create(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
hinfo->pde = proc_create_data(minfo->name, 0,
(family == NFPROTO_IPV4) ?
hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit,
- &dl_file_ops, hinfo);
+ &dl_file_ops_v1, hinfo);
if (hinfo->pde == NULL) {
kfree(hinfo->name);
vfree(hinfo);
@@ -398,7 +398,7 @@ static void htable_put(struct xt_hashlimit_htable *hinfo)
(slowest userspace tool allows), which means
CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32 ie.
*/
-#define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24))
+#define MAX_CPJ_v1 (0xFFFFFFFF / (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
@@ -410,7 +410,7 @@ static void htable_put(struct xt_hashlimit_htable *hinfo)
#define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16))
#define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1)
-#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
+#define CREDITS_PER_JIFFY_v1 POW2_BELOW32(MAX_CPJ_v1)
/* in byte mode, the lowest possible rate is one packet/second.
* credit_cap is used as a counter that tells us how many times we can
@@ -428,11 +428,12 @@ static u32 xt_hashlimit_len_to_chunks(u32 len)
static u32 user2credits(u32 user)
{
/* If multiplying would overflow... */
- if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
+ if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY_v1))
/* Divide first. */
- return (user / XT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
+ return (user / XT_HASHLIMIT_SCALE_v1) *\
+ HZ * CREDITS_PER_JIFFY_v1;
- return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE;
+ return (user * HZ * CREDITS_PER_JIFFY_v1) / XT_HASHLIMIT_SCALE_v1;
}
static u32 user2credits_byte(u32 user)
@@ -461,7 +462,7 @@ static void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now, u32 mode)
return;
}
} else {
- dh->rateinfo.credit += delta * CREDITS_PER_JIFFY;
+ dh->rateinfo.credit += delta * CREDITS_PER_JIFFY_v1;
cap = dh->rateinfo.credit_cap;
}
if (dh->rateinfo.credit > cap)
@@ -603,7 +604,7 @@ static u32 hashlimit_byte_cost(unsigned int len, struct dsthash_ent *dh)
}
static bool
-hashlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
+hashlimit_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
struct xt_hashlimit_htable *hinfo = info->hinfo;
@@ -660,7 +661,7 @@ hashlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
return false;
}
-static int hashlimit_mt_check(const struct xt_mtchk_param *par)
+static int hashlimit_mt_check_v1(const struct xt_mtchk_param *par)
{
struct net *net = par->net;
struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
@@ -701,7 +702,7 @@ static int hashlimit_mt_check(const struct xt_mtchk_param *par)
mutex_lock(&hashlimit_mutex);
info->hinfo = htable_find_get(net, info->name, par->family);
if (info->hinfo == NULL) {
- ret = htable_create(net, info, par->family);
+ ret = htable_create_v1(net, info, par->family);
if (ret < 0) {
mutex_unlock(&hashlimit_mutex);
return ret;
@@ -711,7 +712,7 @@ static int hashlimit_mt_check(const struct xt_mtchk_param *par)
return 0;
}
-static void hashlimit_mt_destroy(const struct xt_mtdtor_param *par)
+static void hashlimit_mt_destroy_v1(const struct xt_mtdtor_param *par)
{
const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
@@ -723,10 +724,10 @@ static struct xt_match hashlimit_mt_reg[] __read_mostly = {
.name = "hashlimit",
.revision = 1,
.family = NFPROTO_IPV4,
- .match = hashlimit_mt,
+ .match = hashlimit_mt_v1,
.matchsize = sizeof(struct xt_hashlimit_mtinfo1),
- .checkentry = hashlimit_mt_check,
- .destroy = hashlimit_mt_destroy,
+ .checkentry = hashlimit_mt_check_v1,
+ .destroy = hashlimit_mt_destroy_v1,
.me = THIS_MODULE,
},
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
@@ -734,10 +735,10 @@ static struct xt_match hashlimit_mt_reg[] __read_mostly = {
.name = "hashlimit",
.revision = 1,
.family = NFPROTO_IPV6,
- .match = hashlimit_mt,
+ .match = hashlimit_mt_v1,
.matchsize = sizeof(struct xt_hashlimit_mtinfo1),
- .checkentry = hashlimit_mt_check,
- .destroy = hashlimit_mt_destroy,
+ .checkentry = hashlimit_mt_check_v1,
+ .destroy = hashlimit_mt_destroy_v1,
.me = THIS_MODULE,
},
#endif
@@ -786,8 +787,8 @@ static void dl_seq_stop(struct seq_file *s, void *v)
spin_unlock_bh(&htable->lock);
}
-static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
- struct seq_file *s)
+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;
@@ -825,7 +826,7 @@ static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
return seq_has_overflowed(s);
}
-static int dl_seq_show(struct seq_file *s, void *v)
+static int dl_seq_show_v1(struct seq_file *s, void *v)
{
struct xt_hashlimit_htable *htable = s->private;
unsigned int *bucket = (unsigned int *)v;
@@ -833,22 +834,22 @@ static int dl_seq_show(struct seq_file *s, void *v)
if (!hlist_empty(&htable->hash[*bucket])) {
hlist_for_each_entry(ent, &htable->hash[*bucket], node)
- if (dl_seq_real_show(ent, htable->family, s))
+ if (dl_seq_real_show_v1(ent, htable->family, s))
return -1;
}
return 0;
}
-static const struct seq_operations dl_seq_ops = {
+static const struct seq_operations dl_seq_ops_v1 = {
.start = dl_seq_start,
.next = dl_seq_next,
.stop = dl_seq_stop,
- .show = dl_seq_show
+ .show = dl_seq_show_v1
};
-static int dl_proc_open(struct inode *inode, struct file *file)
+static int dl_proc_open_v1(struct inode *inode, struct file *file)
{
- int ret = seq_open(file, &dl_seq_ops);
+ int ret = seq_open(file, &dl_seq_ops_v1);
if (!ret) {
struct seq_file *sf = file->private_data;
@@ -857,9 +858,9 @@ static int dl_proc_open(struct inode *inode, struct file *file)
return ret;
}
-static const struct file_operations dl_file_ops = {
+static const struct file_operations dl_file_ops_v1 = {
.owner = THIS_MODULE,
- .open = dl_proc_open,
+ .open = dl_proc_open_v1,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release
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