[NETFILTER] nfnetlink_log: add sequence numbers for log events
By using a sequence number for every logged netfilter event, we can determine from userspace whether logging information was lots somewhere downstream. The user has a choice of either having per-instance local sequence counters, or using a global sequence counter, or both. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -47,6 +47,8 @@ enum nfulnl_attr_type {
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NFULA_PAYLOAD, /* opaque data payload */
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NFULA_PREFIX, /* string prefix */
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NFULA_UID, /* user id of socket */
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NFULA_SEQ, /* instance-local sequence number */
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NFULA_SEQ_GLOBAL, /* global sequence number */
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__NFULA_MAX
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};
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@ -77,6 +79,7 @@ enum nfulnl_attr_config {
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NFULA_CFG_NLBUFSIZ, /* u_int32_t buffer size */
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NFULA_CFG_TIMEOUT, /* u_int32_t in 1/100 s */
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NFULA_CFG_QTHRESH, /* u_int32_t */
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NFULA_CFG_FLAGS, /* u_int16_t */
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__NFULA_CFG_MAX
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};
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#define NFULA_CFG_MAX (__NFULA_CFG_MAX -1)
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@ -85,4 +88,7 @@ enum nfulnl_attr_config {
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#define NFULNL_COPY_META 0x01
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#define NFULNL_COPY_PACKET 0x02
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#define NFULNL_CFG_F_SEQ 0x0001
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#define NFULNL_CFG_F_SEQ_GLOBAL 0x0002
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#endif /* _NFNETLINK_LOG_H */
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@ -11,6 +11,10 @@
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* 2006-01-26 Harald Welte <laforge@netfilter.org>
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* - Add optional local and global sequence number to detect lost
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* events from userspace
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*
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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@ -68,11 +72,14 @@ struct nfulnl_instance {
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unsigned int nlbufsiz; /* netlink buffer allocation size */
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unsigned int qthreshold; /* threshold of the queue */
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u_int32_t copy_range;
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u_int32_t seq; /* instance-local sequential counter */
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u_int16_t group_num; /* number of this queue */
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u_int16_t flags;
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u_int8_t copy_mode;
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};
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static DEFINE_RWLOCK(instances_lock);
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static atomic_t global_seq;
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#define INSTANCE_BUCKETS 16
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static struct hlist_head instance_table[INSTANCE_BUCKETS];
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@ -310,6 +317,16 @@ nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
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return 0;
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}
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static int
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nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
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{
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spin_lock_bh(&inst->lock);
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inst->flags = ntohs(flags);
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spin_unlock_bh(&inst->lock);
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return 0;
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}
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static struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size,
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unsigned int pkt_size)
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{
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@ -377,6 +394,8 @@ static void nfulnl_timer(unsigned long data)
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spin_unlock_bh(&inst->lock);
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}
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/* This is an inline function, we don't really care about a long
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* list of arguments */
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static inline int
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__build_packet_message(struct nfulnl_instance *inst,
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const struct sk_buff *skb,
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@ -515,6 +534,17 @@ __build_packet_message(struct nfulnl_instance *inst,
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read_unlock_bh(&skb->sk->sk_callback_lock);
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}
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/* local sequence number */
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if (inst->flags & NFULNL_CFG_F_SEQ) {
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tmp_uint = htonl(inst->seq++);
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NFA_PUT(inst->skb, NFULA_SEQ, sizeof(tmp_uint), &tmp_uint);
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}
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/* global sequence number */
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if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) {
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tmp_uint = atomic_inc_return(&global_seq);
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NFA_PUT(inst->skb, NFULA_SEQ_GLOBAL, sizeof(tmp_uint), &tmp_uint);
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}
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if (data_len) {
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struct nfattr *nfa;
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int size = NFA_LENGTH(data_len);
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@ -607,6 +637,11 @@ nfulnl_log_packet(unsigned int pf,
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spin_lock_bh(&inst->lock);
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if (inst->flags & NFULNL_CFG_F_SEQ)
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size += NFA_SPACE(sizeof(u_int32_t));
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if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
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size += NFA_SPACE(sizeof(u_int32_t));
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qthreshold = inst->qthreshold;
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/* per-rule qthreshold overrides per-instance */
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if (qthreshold > li->u.ulog.qthreshold)
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@ -736,10 +771,14 @@ static const int nfula_min[NFULA_MAX] = {
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[NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp),
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[NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t),
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[NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t),
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[NFULA_IFINDEX_PHYSINDEV-1] = sizeof(u_int32_t),
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[NFULA_IFINDEX_PHYSOUTDEV-1] = sizeof(u_int32_t),
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[NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw),
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[NFULA_PAYLOAD-1] = 0,
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[NFULA_PREFIX-1] = 0,
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[NFULA_UID-1] = sizeof(u_int32_t),
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[NFULA_SEQ-1] = sizeof(u_int32_t),
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[NFULA_SEQ_GLOBAL-1] = sizeof(u_int32_t),
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};
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static const int nfula_cfg_min[NFULA_CFG_MAX] = {
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@ -748,6 +787,7 @@ static const int nfula_cfg_min[NFULA_CFG_MAX] = {
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[NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t),
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[NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t),
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[NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t),
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[NFULA_CFG_FLAGS-1] = sizeof(u_int16_t),
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};
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static int
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@ -859,6 +899,12 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
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nfulnl_set_qthresh(inst, ntohl(qthresh));
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}
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if (nfula[NFULA_CFG_FLAGS-1]) {
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u_int16_t flags =
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*(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_FLAGS-1]);
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nfulnl_set_flags(inst, ntohl(flags));
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}
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out_put:
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instance_put(inst);
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return ret;
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