netfilter: fixup the quota2, and enable.
The xt_quota2 came from http://sourceforge.net/projects/xtables-addons/develop It needed tweaking for it to compile within the kernel tree. Fixed kmalloc() and create_proc_entry() invocations within a non-interruptible context. Removed useless copying of current quota back to the iptable's struct matchinfo: - those are per CPU: they will change randomly based on which cpu gets to update the value. - they prevent matching a rule: e.g. -A chain -m quota2 --name q1 --quota 123 can't be followed by -D chain -m quota2 --name q1 --quota 123 as the 123 will be compared to the struct matchinfo's quota member. Use the NETLINK NETLINK_NFLOG family to log a single message when the quota limit is reached. It uses the same packet type as ipt_ULOG, but - never copies skb data, - uses 112 as the event number (ULOG's +1) It doesn't log if the module param "event_num" is 0. Change-Id: I021d3b743db3b22158cc49acb5c94d905b501492 Signed-off-by: JP Abgrall <jpa@google.com>
This commit is contained in:
JP Abgrall
Colin Cross
parent
7f4e01a48b
commit
18913bc477
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@ -1028,6 +1028,30 @@ config NETFILTER_XT_MATCH_QUOTA
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
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config NETFILTER_XT_MATCH_QUOTA2
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tristate '"quota2" match support'
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depends on NETFILTER_ADVANCED
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help
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This option adds a `quota2' match, which allows to match on a
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byte counter correctly and not per CPU.
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It allows naming the quotas.
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This is based on http://xtables-addons.git.sourceforge.net
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If you want to compile it as a module, say M here and read
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<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
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config NETFILTER_XT_MATCH_QUOTA2_LOG
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bool '"quota2" Netfilter LOG support'
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depends on NETFILTER_XT_MATCH_QUOTA2
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depends on IP_NF_TARGET_ULOG=n # not yes, not module, just no
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default n
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help
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This option allows `quota2' to log ONCE when a quota limit
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is passed. It logs via NETLINK using the NETLINK_NFLOG family.
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It logs similarly to how ipt_ULOG would without data.
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If unsure, say `N'.
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config NETFILTER_XT_MATCH_RATEEST
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tristate '"rateest" match support'
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depends on NETFILTER_ADVANCED
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@ -103,6 +103,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
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obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o
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obj-$(CONFIG_NETFILTER_XT_MATCH_QTAGUID) += xt_qtaguid_print.o xt_qtaguid.o
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obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) += xt_quota.o
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obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA2) += xt_quota2.o
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obj-$(CONFIG_NETFILTER_XT_MATCH_RATEEST) += xt_rateest.o
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obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o
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obj-$(CONFIG_NETFILTER_XT_MATCH_RECENT) += xt_recent.o
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@ -12,14 +12,17 @@
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* version 2 of the License, as published by the Free Software Foundation.
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*/
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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#include <linux/netfilter/x_tables.h>
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#include "xt_quota2.h"
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#include "compat_xtables.h"
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#include <linux/netfilter/xt_quota2.h>
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#ifdef CONFIG_NETFILTER_XT_MATCH_QUOTA2_LOG
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#include <linux/netfilter_ipv4/ipt_ULOG.h>
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#endif
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/**
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* @lock: lock to protect quota writers from each other
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@ -33,6 +36,16 @@ struct xt_quota_counter {
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struct proc_dir_entry *procfs_entry;
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};
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#ifdef CONFIG_NETFILTER_XT_MATCH_QUOTA2_LOG
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/* Harald's favorite number +1 :D From ipt_ULOG.C */
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static int qlog_nl_event = 112;
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module_param_named(event_num, qlog_nl_event, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(event_num,
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"Event number for NETLINK_NFLOG message. 0 disables log."
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"111 is what ipt_ULOG uses.");
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static struct sock *nflognl;
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#endif
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static LIST_HEAD(counter_list);
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static DEFINE_SPINLOCK(counter_list_lock);
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@ -44,6 +57,69 @@ module_param_named(perms, quota_list_perms, uint, S_IRUGO | S_IWUSR);
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module_param_named(uid, quota_list_uid, uint, S_IRUGO | S_IWUSR);
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module_param_named(gid, quota_list_gid, uint, S_IRUGO | S_IWUSR);
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#ifdef CONFIG_NETFILTER_XT_MATCH_QUOTA2_LOG
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static void quota2_log(unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const char *prefix)
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{
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ulog_packet_msg_t *pm;
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struct sk_buff *log_skb;
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size_t size;
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struct nlmsghdr *nlh;
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if (!qlog_nl_event)
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return;
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size = NLMSG_SPACE(sizeof(*pm));
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size = max(size, (size_t)NLMSG_GOODSIZE);
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log_skb = alloc_skb(size, GFP_ATOMIC);
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if (!log_skb) {
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pr_err("xt_quota2: cannot alloc skb for logging\n");
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return;
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}
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/* NLMSG_PUT() uses "goto nlmsg_failure" */
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nlh = NLMSG_PUT(log_skb, /*pid*/0, /*seq*/0, qlog_nl_event,
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sizeof(*pm));
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pm = NLMSG_DATA(nlh);
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if (skb->tstamp.tv64 == 0)
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__net_timestamp((struct sk_buff *)skb);
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pm->data_len = 0;
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pm->hook = hooknum;
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if (prefix != NULL)
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strlcpy(pm->prefix, prefix, sizeof(pm->prefix));
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else
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*(pm->prefix) = '\0';
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if (in)
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strlcpy(pm->indev_name, in->name, sizeof(pm->indev_name));
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else
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pm->indev_name[0] = '\0';
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if (out)
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strlcpy(pm->outdev_name, out->name, sizeof(pm->outdev_name));
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else
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pm->outdev_name[0] = '\0';
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NETLINK_CB(log_skb).dst_group = 1;
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pr_debug("throwing 1 packets to netlink group 1\n");
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netlink_broadcast(nflognl, log_skb, 0, 1, GFP_ATOMIC);
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nlmsg_failure: /* Used within NLMSG_PUT() */
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pr_debug("xt_quota2: error during NLMSG_PUT\n");
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}
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#else
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static void quota2_log(unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const char *prefix)
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{
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}
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#endif /* if+else CONFIG_NETFILTER_XT_MATCH_QUOTA2_LOG */
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static int quota_proc_read(char *page, char **start, off_t offset,
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int count, int *eof, void *data)
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{
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@ -91,7 +167,7 @@ q2_new_counter(const struct xt_quota_mtinfo2 *q, bool anon)
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if (!anon) {
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INIT_LIST_HEAD(&e->list);
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atomic_set(&e->ref, 1);
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strncpy(e->name, q->name, sizeof(e->name));
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strlcpy(e->name, q->name, sizeof(e->name));
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}
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return e;
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}
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@ -104,42 +180,56 @@ static struct xt_quota_counter *
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q2_get_counter(const struct xt_quota_mtinfo2 *q)
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{
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struct proc_dir_entry *p;
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struct xt_quota_counter *e;
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struct xt_quota_counter *e = NULL;
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struct xt_quota_counter *new_e;
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if (*q->name == '\0')
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return q2_new_counter(q, true);
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/* No need to hold a lock while getting a new counter */
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new_e = q2_new_counter(q, false);
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if (new_e == NULL)
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goto out;
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spin_lock_bh(&counter_list_lock);
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list_for_each_entry(e, &counter_list, list)
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if (strcmp(e->name, q->name) == 0) {
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atomic_inc(&e->ref);
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spin_unlock_bh(&counter_list_lock);
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kfree(new_e);
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pr_debug("xt_quota2: old counter name=%s", e->name);
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return e;
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}
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e = new_e;
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pr_debug("xt_quota2: new_counter name=%s", e->name);
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list_add_tail(&e->list, &counter_list);
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/* The entry having a refcount of 1 is not directly destructible.
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* This func has not yet returned the new entry, thus iptables
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* has not references for destroying this entry.
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* For another rule to try to destroy it, it would 1st need for this
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* func* to be re-invoked, acquire a new ref for the same named quota.
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* Nobody will access the e->procfs_entry either.
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* So release the lock. */
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spin_unlock_bh(&counter_list_lock);
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e = q2_new_counter(q, false);
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if (e == NULL)
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goto out;
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/* create_proc_entry() is not spin_lock happy */
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p = e->procfs_entry = create_proc_entry(e->name, quota_list_perms,
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proc_xt_quota);
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if (p == NULL || IS_ERR(p))
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goto out;
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#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 29)
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p->owner = THIS_MODULE;
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#endif
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if (IS_ERR_OR_NULL(p)) {
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spin_lock_bh(&counter_list_lock);
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list_del(&e->list);
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spin_unlock_bh(&counter_list_lock);
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goto out;
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}
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p->data = e;
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p->read_proc = quota_proc_read;
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p->write_proc = quota_proc_write;
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p->uid = quota_list_uid;
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p->gid = quota_list_gid;
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list_add_tail(&e->list, &counter_list);
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spin_unlock_bh(&counter_list_lock);
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return e;
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out:
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spin_unlock_bh(&counter_list_lock);
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kfree(e);
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return NULL;
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}
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@ -148,6 +238,8 @@ static int quota_mt2_check(const struct xt_mtchk_param *par)
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{
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struct xt_quota_mtinfo2 *q = par->matchinfo;
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pr_debug("xt_quota2: check() flags=0x%04x", q->flags);
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if (q->flags & ~XT_QUOTA_MASK)
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return -EINVAL;
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@ -203,7 +295,6 @@ quota_mt2(const struct sk_buff *skb, struct xt_action_param *par)
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*/
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if (!(q->flags & XT_QUOTA_NO_CHANGE)) {
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e->quota += (q->flags & XT_QUOTA_PACKET) ? 1 : skb->len;
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q->quota = e->quota;
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}
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ret = true;
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} else {
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@ -212,10 +303,17 @@ quota_mt2(const struct sk_buff *skb, struct xt_action_param *par)
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e->quota -= (q->flags & XT_QUOTA_PACKET) ? 1 : skb->len;
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ret = !ret;
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} else {
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/* We are transitioning, log that fact. */
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if (e->quota) {
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quota2_log(par->hooknum,
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skb,
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par->in,
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par->out,
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q->name);
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}
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/* we do not allow even small packets from now on */
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e->quota = 0;
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}
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q->quota = e->quota;
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}
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spin_unlock_bh(&e->lock);
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return ret;
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@ -228,7 +326,7 @@ static struct xt_match quota_mt2_reg[] __read_mostly = {
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.family = NFPROTO_IPV4,
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.checkentry = quota_mt2_check,
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.match = quota_mt2,
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.destroy = quota_mt2_destroy,
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.destroy = quota_mt2_destroy,
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.matchsize = sizeof(struct xt_quota_mtinfo2),
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.me = THIS_MODULE,
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},
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@ -238,7 +336,7 @@ static struct xt_match quota_mt2_reg[] __read_mostly = {
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.family = NFPROTO_IPV6,
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.checkentry = quota_mt2_check,
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.match = quota_mt2,
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.destroy = quota_mt2_destroy,
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.destroy = quota_mt2_destroy,
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.matchsize = sizeof(struct xt_quota_mtinfo2),
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.me = THIS_MODULE,
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},
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@ -247,21 +345,31 @@ static struct xt_match quota_mt2_reg[] __read_mostly = {
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static int __init quota_mt2_init(void)
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{
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int ret;
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pr_debug("xt_quota2: init()");
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proc_xt_quota = proc_mkdir("xt_quota", init_net__proc_net);
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#ifdef CONFIG_NETFILTER_XT_MATCH_QUOTA2_LOG
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nflognl = netlink_kernel_create(&init_net,
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NETLINK_NFLOG, 1, NULL,
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NULL, THIS_MODULE);
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if (!nflognl)
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return -ENOMEM;
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#endif
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proc_xt_quota = proc_mkdir("xt_quota", init_net.proc_net);
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if (proc_xt_quota == NULL)
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return -EACCES;
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ret = xt_register_matches(quota_mt2_reg, ARRAY_SIZE(quota_mt2_reg));
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if (ret < 0)
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remove_proc_entry("xt_quota", init_net__proc_net);
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remove_proc_entry("xt_quota", init_net.proc_net);
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pr_debug("xt_quota2: init() %d", ret);
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return ret;
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}
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static void __exit quota_mt2_exit(void)
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{
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xt_unregister_matches(quota_mt2_reg, ARRAY_SIZE(quota_mt2_reg));
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remove_proc_entry("xt_quota", init_net__proc_net);
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remove_proc_entry("xt_quota", init_net.proc_net);
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}
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module_init(quota_mt2_init);
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