From 0dc60a4546fefc6dc9f54abf60beeeb3501726fa Mon Sep 17 00:00:00 2001 From: Vishwanath Pai Date: Thu, 22 Sep 2016 12:42:46 -0400 Subject: [PATCH] netfilter: xt_hashlimit: Prepare 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 Signed-off-by: Joshua Hunt Signed-off-by: Pablo Neira Ayuso --- net/netfilter/xt_hashlimit.c | 61 ++++++++++++++++++------------------ 1 file changed, 31 insertions(+), 30 deletions(-) diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c index 178696852bde..e93d9e0a3f35 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) *\ + HZ * CREDITS_PER_JIFFY_v1; - return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE; + return (user * HZ * CREDITS_PER_JIFFY_v1) / XT_HASHLIMIT_SCALE; } 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 -- 2.20.1