netfilter: xtables: remove xt_hashlimit revision 0
Superseded by xt_hashlimit revision 1 (linux v2.6.24-6212-g09e410d, iptables 1.4.1-rc1). Signed-off-by: Jan Engelhardt <jengelh@medozas.de>hifive-unleashed-5.1
Jan Engelhardt
parent
f95c74e33e
commit
779dd630d8
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@ -193,76 +193,6 @@ dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent)
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}
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static void htable_gc(unsigned long htlong);
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static int htable_create_v0(struct net *net, struct xt_hashlimit_info *minfo, u_int8_t family)
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{
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struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
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struct xt_hashlimit_htable *hinfo;
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unsigned int size;
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unsigned int i;
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if (minfo->cfg.size)
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size = minfo->cfg.size;
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else {
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size = ((totalram_pages << PAGE_SHIFT) / 16384) /
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sizeof(struct list_head);
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if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE))
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size = 8192;
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if (size < 16)
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size = 16;
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}
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/* FIXME: don't use vmalloc() here or anywhere else -HW */
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hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) +
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sizeof(struct list_head) * size);
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if (!hinfo)
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return -ENOMEM;
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minfo->hinfo = hinfo;
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/* copy match config into hashtable config */
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hinfo->cfg.mode = minfo->cfg.mode;
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hinfo->cfg.avg = minfo->cfg.avg;
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hinfo->cfg.burst = minfo->cfg.burst;
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hinfo->cfg.max = minfo->cfg.max;
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hinfo->cfg.gc_interval = minfo->cfg.gc_interval;
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hinfo->cfg.expire = minfo->cfg.expire;
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if (family == NFPROTO_IPV4)
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hinfo->cfg.srcmask = hinfo->cfg.dstmask = 32;
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else
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hinfo->cfg.srcmask = hinfo->cfg.dstmask = 128;
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hinfo->cfg.size = size;
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if (!hinfo->cfg.max)
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hinfo->cfg.max = 8 * hinfo->cfg.size;
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else if (hinfo->cfg.max < hinfo->cfg.size)
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hinfo->cfg.max = hinfo->cfg.size;
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for (i = 0; i < hinfo->cfg.size; i++)
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INIT_HLIST_HEAD(&hinfo->hash[i]);
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hinfo->use = 1;
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hinfo->count = 0;
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hinfo->family = family;
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hinfo->rnd_initialized = false;
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spin_lock_init(&hinfo->lock);
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hinfo->pde = proc_create_data(minfo->name, 0,
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(family == NFPROTO_IPV4) ?
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hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit,
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&dl_file_ops, hinfo);
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if (!hinfo->pde) {
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vfree(hinfo);
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return -ENOMEM;
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}
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hinfo->net = net;
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setup_timer(&hinfo->timer, htable_gc, (unsigned long )hinfo);
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hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval);
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add_timer(&hinfo->timer);
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hlist_add_head(&hinfo->node, &hashlimit_net->htables);
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return 0;
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}
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static int htable_create(struct net *net, struct xt_hashlimit_mtinfo1 *minfo,
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u_int8_t family)
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{
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@ -570,57 +500,6 @@ hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo,
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return 0;
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}
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static bool
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hashlimit_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
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{
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const struct xt_hashlimit_info *r = par->matchinfo;
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struct xt_hashlimit_htable *hinfo = r->hinfo;
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unsigned long now = jiffies;
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struct dsthash_ent *dh;
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struct dsthash_dst dst;
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if (hashlimit_init_dst(hinfo, &dst, skb, par->thoff) < 0)
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goto hotdrop;
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spin_lock_bh(&hinfo->lock);
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dh = dsthash_find(hinfo, &dst);
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if (!dh) {
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dh = dsthash_alloc_init(hinfo, &dst);
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if (!dh) {
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spin_unlock_bh(&hinfo->lock);
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goto hotdrop;
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}
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dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire);
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dh->rateinfo.prev = jiffies;
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dh->rateinfo.credit = user2credits(hinfo->cfg.avg *
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hinfo->cfg.burst);
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dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg *
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hinfo->cfg.burst);
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dh->rateinfo.cost = user2credits(hinfo->cfg.avg);
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} else {
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/* update expiration timeout */
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dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire);
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rateinfo_recalc(dh, now);
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}
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if (dh->rateinfo.credit >= dh->rateinfo.cost) {
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/* We're underlimit. */
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dh->rateinfo.credit -= dh->rateinfo.cost;
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spin_unlock_bh(&hinfo->lock);
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return true;
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}
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spin_unlock_bh(&hinfo->lock);
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/* default case: we're overlimit, thus don't match */
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return false;
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hotdrop:
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*par->hotdrop = true;
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return false;
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}
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static bool
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hashlimit_mt(const struct sk_buff *skb, const struct xt_match_param *par)
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{
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@ -671,45 +550,6 @@ hashlimit_mt(const struct sk_buff *skb, const struct xt_match_param *par)
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return false;
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}
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static int hashlimit_mt_check_v0(const struct xt_mtchk_param *par)
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{
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struct net *net = par->net;
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struct xt_hashlimit_info *r = par->matchinfo;
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int ret;
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/* Check for overflow. */
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if (r->cfg.burst == 0 ||
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user2credits(r->cfg.avg * r->cfg.burst) < user2credits(r->cfg.avg)) {
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pr_info("overflow, try lower: %u/%u\n",
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r->cfg.avg, r->cfg.burst);
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return -ERANGE;
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}
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if (r->cfg.mode == 0 ||
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r->cfg.mode > (XT_HASHLIMIT_HASH_DPT |
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XT_HASHLIMIT_HASH_DIP |
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XT_HASHLIMIT_HASH_SIP |
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XT_HASHLIMIT_HASH_SPT))
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return -EINVAL;
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if (!r->cfg.gc_interval)
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return -EINVAL;
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if (!r->cfg.expire)
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return -EINVAL;
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if (r->name[sizeof(r->name) - 1] != '\0')
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return -EINVAL;
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mutex_lock(&hashlimit_mutex);
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r->hinfo = htable_find_get(net, r->name, par->family);
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if (r->hinfo == NULL) {
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ret = htable_create_v0(net, r, par->family);
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if (ret < 0) {
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mutex_unlock(&hashlimit_mutex);
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return ret;
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}
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}
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mutex_unlock(&hashlimit_mutex);
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return 0;
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}
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static int hashlimit_mt_check(const struct xt_mtchk_param *par)
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{
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struct net *net = par->net;
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@ -749,14 +589,6 @@ static int hashlimit_mt_check(const struct xt_mtchk_param *par)
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return 0;
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}
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static void
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hashlimit_mt_destroy_v0(const struct xt_mtdtor_param *par)
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{
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const struct xt_hashlimit_info *r = par->matchinfo;
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htable_put(r->hinfo);
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}
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static void hashlimit_mt_destroy(const struct xt_mtdtor_param *par)
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{
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const struct xt_hashlimit_mtinfo1 *info = par->matchinfo;
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@ -764,46 +596,7 @@ static void hashlimit_mt_destroy(const struct xt_mtdtor_param *par)
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htable_put(info->hinfo);
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}
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#ifdef CONFIG_COMPAT
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struct compat_xt_hashlimit_info {
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char name[IFNAMSIZ];
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struct hashlimit_cfg cfg;
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compat_uptr_t hinfo;
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compat_uptr_t master;
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};
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static void hashlimit_mt_compat_from_user(void *dst, const void *src)
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{
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int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
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memcpy(dst, src, off);
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memset(dst + off, 0, sizeof(struct compat_xt_hashlimit_info) - off);
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}
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static int hashlimit_mt_compat_to_user(void __user *dst, const void *src)
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{
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int off = offsetof(struct compat_xt_hashlimit_info, hinfo);
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return copy_to_user(dst, src, off) ? -EFAULT : 0;
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}
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#endif
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static struct xt_match hashlimit_mt_reg[] __read_mostly = {
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{
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.name = "hashlimit",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.match = hashlimit_mt_v0,
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.matchsize = sizeof(struct xt_hashlimit_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_xt_hashlimit_info),
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.compat_from_user = hashlimit_mt_compat_from_user,
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.compat_to_user = hashlimit_mt_compat_to_user,
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#endif
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.checkentry = hashlimit_mt_check_v0,
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.destroy = hashlimit_mt_destroy_v0,
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.me = THIS_MODULE
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},
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{
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.name = "hashlimit",
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.revision = 1,
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@ -815,20 +608,6 @@ static struct xt_match hashlimit_mt_reg[] __read_mostly = {
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.me = THIS_MODULE,
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},
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#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
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{
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.name = "hashlimit",
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.family = NFPROTO_IPV6,
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.match = hashlimit_mt_v0,
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.matchsize = sizeof(struct xt_hashlimit_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_xt_hashlimit_info),
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.compat_from_user = hashlimit_mt_compat_from_user,
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.compat_to_user = hashlimit_mt_compat_to_user,
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#endif
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.checkentry = hashlimit_mt_check_v0,
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.destroy = hashlimit_mt_destroy_v0,
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.me = THIS_MODULE
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},
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{
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.name = "hashlimit",
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.revision = 1,
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