/* Connection tracking via netlink socket. Allows for user space
* protocol helpers and general trouble making from userspace.
*
* (C) 2001 by Jay Schulist <[email protected]>
* (C) 2002-2006 by Harald Welte <[email protected]>
* (C) 2003 by Patrick Mchardy <[email protected]>
* (C) 2005-2006 by Pablo Neira Ayuso <[email protected]>
*
* I‘ve reworked this stuff to use attributes instead of conntrack
* structures. 5.44 am. I need more tea. --pablo 05/07/11.
*
* Initial connection tracking via netlink development funded and
* generally made possible by Network Robots, Inc. (www.networkrobots.com)
*
* Further development of this code funded by Astaro AG (http://www.astaro.com)
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_protocol.h>
#endif
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
MODULE_LICENSE("GPL");
static char __initdata version[] = "0.93";
static inline int
ctnetlink_dump_tuples_proto(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_l4proto *l4proto)
{
int ret = 0;
struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
if (likely(l4proto->tuple_to_nfattr))
ret = l4proto->tuple_to_nfattr(skb, tuple);
NFA_NEST_END(skb, nest_parms);
return ret;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_tuples_ip(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_l3proto *l3proto)
{
int ret = 0;
struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
if (likely(l3proto->tuple_to_nfattr))
ret = l3proto->tuple_to_nfattr(skb, tuple);
NFA_NEST_END(skb, nest_parms);
return ret;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_tuples(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
int ret;
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
nf_ct_l3proto_put(l3proto);
if (unlikely(ret < 0))
return ret;
l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
nf_ct_l4proto_put(l4proto);
return ret;
}
static inline int
ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
{
__be32 status = htonl((u_int32_t) ct->status);
NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
{
long timeout_l = ct->timeout.expires - jiffies;
__be32 timeout;
if (timeout_l < 0)
timeout = 0;
else
timeout = htonl(timeout_l / HZ);
NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
struct nfattr *nest_proto;
int ret;
if (!l4proto->to_nfattr) {
nf_ct_l4proto_put(l4proto);
return 0;
}
nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
ret = l4proto->to_nfattr(skb, nest_proto, ct);
nf_ct_l4proto_put(l4proto);
NFA_NEST_END(skb, nest_proto);
return ret;
nfattr_failure:
nf_ct_l4proto_put(l4proto);
return -1;
}
static inline int
ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nfattr *nest_helper;
const struct nf_conn_help *help = nfct_help(ct);
if (!help || !help->helper)
return 0;
nest_helper = NFA_NEST(skb, CTA_HELP);
NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
if (help->helper->to_nfattr)
help->helper->to_nfattr(skb, ct);
NFA_NEST_END(skb, nest_helper);
return 0;
nfattr_failure:
return -1;
}
#ifdef CONFIG_NF_CT_ACCT
static inline int
ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
enum ip_conntrack_dir dir)
{
enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
struct nfattr *nest_count = NFA_NEST(skb, type);
__be32 tmp;
tmp = htonl(ct->counters[dir].packets);
NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
tmp = htonl(ct->counters[dir].bytes);
NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
NFA_NEST_END(skb, nest_count);
return 0;
nfattr_failure:
return -1;
}
#else
#define ctnetlink_dump_counters(a, b, c) (0)
#endif
#ifdef CONFIG_NF_CONNTRACK_MARK
static inline int
ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
{
__be32 mark = htonl(ct->mark);
NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
return 0;
nfattr_failure:
return -1;
}
#else
#define ctnetlink_dump_mark(a, b) (0)
#endif
static inline int
ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
{
__be32 id = htonl(ct->id);
NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
{
__be32 use = htonl(atomic_read(&ct->ct_general.use));
NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
return 0;
nfattr_failure:
return -1;
}
#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
static int
ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
int event, int nowait,
const struct nf_conn *ct)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nfattr *nest_parms;
unsigned char *b;
b = skb->tail;
event |= NFNL_SUBSYS_CTNETLINK << 8;
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
nfmsg->nfgen_family =
ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
if (ctnetlink_dump_status(skb, ct) < 0 ||
ctnetlink_dump_timeout(skb, ct) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
ctnetlink_dump_protoinfo(skb, ct) < 0 ||
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0)
goto nfattr_failure;
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
nfattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static int ctnetlink_conntrack_event(struct notifier_block *this,
unsigned long events, void *ptr)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nfattr *nest_parms;
struct nf_conn *ct = (struct nf_conn *)ptr;
struct sk_buff *skb;
unsigned int type;
unsigned char *b;
unsigned int flags = 0, group;
/* ignore our fake conntrack entry */
if (ct == &nf_conntrack_untracked)
return NOTIFY_DONE;
if (events & IPCT_DESTROY) {
type = IPCTNL_MSG_CT_DELETE;
group = NFNLGRP_CONNTRACK_DESTROY;
} else if (events & (IPCT_NEW | IPCT_RELATED)) {
type = IPCTNL_MSG_CT_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
group = NFNLGRP_CONNTRACK_NEW;
} else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
type = IPCTNL_MSG_CT_NEW;
group = NFNLGRP_CONNTRACK_UPDATE;
} else
return NOTIFY_DONE;
if (!nfnetlink_has_listeners(group))
return NOTIFY_DONE;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb)
return NOTIFY_DONE;
b = skb->tail;
type |= NFNL_SUBSYS_CTNETLINK << 8;
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = flags;
nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
if (events & IPCT_DESTROY) {
if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
goto nfattr_failure;
} else {
if (ctnetlink_dump_status(skb, ct) < 0)
goto nfattr_failure;
if (ctnetlink_dump_timeout(skb, ct) < 0)
goto nfattr_failure;
if (events & IPCT_PROTOINFO
&& ctnetlink_dump_protoinfo(skb, ct) < 0)
goto nfattr_failure;
if ((events & IPCT_HELPER || nfct_help(ct))
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
goto nfattr_failure;
#ifdef CONFIG_NF_CONNTRACK_MARK
if ((events & IPCT_MARK || ct->mark)
&& ctnetlink_dump_mark(skb, ct) < 0)
goto nfattr_failure;
#endif
if (events & IPCT_COUNTER_FILLING &&
(ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
goto nfattr_failure;
}
nlh->nlmsg_len = skb->tail - b;
nfnetlink_send(skb, 0, group, 0);
return NOTIFY_DONE;
nlmsg_failure:
nfattr_failure:
kfree_skb(skb);
return NOTIFY_DONE;
}
#endif /* CONFIG_NF_CONNTRACK_EVENTS */
static int ctnetlink_done(struct netlink_callback *cb)
{
if (cb->args[1])
nf_ct_put((struct nf_conn *)cb->args[1]);
return 0;
}
#define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
static int
ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nf_conn *ct, *last;
struct nf_conntrack_tuple_hash *h;
struct list_head *i;
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
u_int8_t l3proto = nfmsg->nfgen_family;
read_lock_bh(&nf_conntrack_lock);
last = (struct nf_conn *)cb->args[1];
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
restart:
list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
h = (struct nf_conntrack_tuple_hash *) i;
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_ct_tuplehash_to_ctrack(h);
/* Dump entries of a given L3 protocol number.
* If it is not specified, ie. l3proto == 0,
* then dump everything. */
if (l3proto && L3PROTO(ct) != l3proto)
continue;
if (cb->args[1]) {
if (ct != last)
continue;
cb->args[1] = 0;
}
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_CT_NEW,
1, ct) < 0) {
nf_conntrack_get(&ct->ct_general);
cb->args[1] = (unsigned long)ct;
goto out;
}
#ifdef CONFIG_NF_CT_ACCT
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
IPCTNL_MSG_CT_GET_CTRZERO)
memset(&ct->counters, 0, sizeof(ct->counters));
#endif
}
if (cb->args[1]) {
cb->args[1] = 0;
goto restart;
}
}
out:
read_unlock_bh(&nf_conntrack_lock);
if (last)
nf_ct_put(last);
return skb->len;
}
static inline int
ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
{
struct nfattr *tb[CTA_IP_MAX];
struct nf_conntrack_l3proto *l3proto;
int ret = 0;
nfattr_parse_nested(tb, CTA_IP_MAX, attr);
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
if (likely(l3proto->nfattr_to_tuple))
ret = l3proto->nfattr_to_tuple(tb, tuple);
nf_ct_l3proto_put(l3proto);
return ret;
}
static const size_t cta_min_proto[CTA_PROTO_MAX] = {
[CTA_PROTO_NUM-1] = sizeof(u_int8_t),
};
static inline int
ctnetlink_parse_tuple_proto(struct nfattr *attr,
struct nf_conntrack_tuple *tuple)
{
struct nfattr *tb[CTA_PROTO_MAX];
struct nf_conntrack_l4proto *l4proto;
int ret = 0;
nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
return -EINVAL;
if (!tb[CTA_PROTO_NUM-1])
return -EINVAL;
tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
if (likely(l4proto->nfattr_to_tuple))
ret = l4proto->nfattr_to_tuple(tb, tuple);
nf_ct_l4proto_put(l4proto);
return ret;
}
static inline int
ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
enum ctattr_tuple type, u_int8_t l3num)
{
struct nfattr *tb[CTA_TUPLE_MAX];
int err;
memset(tuple, 0, sizeof(*tuple));
nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
if (!tb[CTA_TUPLE_IP-1])
return -EINVAL;
tuple->src.l3num = l3num;
err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
if (err < 0)
return err;
if (!tb[CTA_TUPLE_PROTO-1])
return -EINVAL;
err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
if (err < 0)
return err;
/* orig and expect tuples get DIR_ORIGINAL */
if (type == CTA_TUPLE_REPLY)
tuple->dst.dir = IP_CT_DIR_REPLY;
else
tuple->dst.dir = IP_CT_DIR_ORIGINAL;
return 0;
}
#ifdef CONFIG_NF_NAT_NEEDED
static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
[CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
[CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
};
static int nfnetlink_parse_nat_proto(struct nfattr *attr,
const struct nf_conn *ct,
struct nf_nat_range *range)
{
struct nfattr *tb[CTA_PROTONAT_MAX];
struct nf_nat_protocol *npt;
nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
return -EINVAL;
npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
if (!npt->nfattr_to_range) {
nf_nat_proto_put(npt);
return 0;
}
/* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
if (npt->nfattr_to_range(tb, range) > 0)
range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
nf_nat_proto_put(npt);
return 0;
}
static const size_t cta_min_nat[CTA_NAT_MAX] = {
[CTA_NAT_MINIP-1] = sizeof(u_int32_t),
[CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
};
static inline int
nfnetlink_parse_nat(struct nfattr *nat,
const struct nf_conn *ct, struct nf_nat_range *range)
{
struct nfattr *tb[CTA_NAT_MAX];
int err;
memset(range, 0, sizeof(*range));
nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
return -EINVAL;
if (tb[CTA_NAT_MINIP-1])
range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
if (!tb[CTA_NAT_MAXIP-1])
range->max_ip = range->min_ip;
else
range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
if (range->min_ip)
range->flags |= IP_NAT_RANGE_MAP_IPS;
if (!tb[CTA_NAT_PROTO-1])
return 0;
err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
if (err < 0)
return err;
return 0;
}
#endif
static inline int
ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
{
struct nfattr *tb[CTA_HELP_MAX];
nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
if (!tb[CTA_HELP_NAME-1])
return -EINVAL;
*helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
return 0;
}
static const size_t cta_min[CTA_MAX] = {
[CTA_STATUS-1] = sizeof(u_int32_t),
[CTA_TIMEOUT-1] = sizeof(u_int32_t),
[CTA_MARK-1] = sizeof(u_int32_t),
[CTA_USE-1] = sizeof(u_int32_t),
[CTA_ID-1] = sizeof(u_int32_t)
};
static int
ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
struct nf_conn *ct;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
return -EINVAL;
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
else {
/* Flush the whole table */
nf_conntrack_flush();
return 0;
}
if (err < 0)
return err;
h = nf_conntrack_find_get(&tuple, NULL);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
if (cda[CTA_ID-1]) {
u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
if (ct->id != id) {
nf_ct_put(ct);
return -ENOENT;
}
}
if (del_timer(&ct->timeout))
ct->timeout.function((unsigned long)ct);
nf_ct_put(ct);
return 0;
}
static int
ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
struct nf_conn *ct;
struct sk_buff *skb2 = NULL;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
if (nlh->nlmsg_flags & NLM_F_DUMP) {
u32 rlen;
#ifndef CONFIG_NF_CT_ACCT
if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
return -ENOTSUPP;
#endif
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
ctnetlink_dump_table,
ctnetlink_done)) != 0)
return -EINVAL;
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
skb_pull(skb, rlen);
return 0;
}
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
return -EINVAL;
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
else
return -EINVAL;
if (err < 0)
return err;
h = nf_conntrack_find_get(&tuple, NULL);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
err = -ENOMEM;
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb2) {
nf_ct_put(ct);
return -ENOMEM;
}
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
IPCTNL_MSG_CT_NEW, 1, ct);
nf_ct_put(ct);
if (err <= 0)
goto free;
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
if (err < 0)
goto out;
return 0;
free:
kfree_skb(skb2);
out:
return err;
}
static inline int
ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
{
unsigned long d;
unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
d = ct->status ^ status;
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
/* unchangeable */
return -EINVAL;
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
/* SEEN_REPLY bit can only be set */
return -EINVAL;
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
/* ASSURED bit can only be set */
return -EINVAL;
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
#ifndef CONFIG_NF_NAT_NEEDED
return -EINVAL;
#else
struct nf_nat_range range;
if (cda[CTA_NAT_DST-1]) {
if (nfnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
&range) < 0)
return -EINVAL;
if (nf_nat_initialized(ct,
HOOK2MANIP(NF_IP_PRE_ROUTING)))
return -EEXIST;
nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
}
if (cda[CTA_NAT_SRC-1]) {
if (nfnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
&range) < 0)
return -EINVAL;
if (nf_nat_initialized(ct,
HOOK2MANIP(NF_IP_POST_ROUTING)))
return -EEXIST;
nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
}
#endif
}
/* Be careful here, modifying NAT bits can screw up things,
* so don‘t let users modify them directly if they don‘t pass
* nf_nat_range. */
ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
return 0;
}
static inline int
ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
{
struct nf_conntrack_helper *helper;
struct nf_conn_help *help = nfct_help(ct);
char *helpname;
int err;
if (!help) {
/* FIXME: we need to reallocate and rehash */
return -EBUSY;
}
/* don‘t change helper of sibling connections */
if (ct->master)
return -EINVAL;
err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
if (err < 0)
return err;
helper = __nf_conntrack_helper_find_byname(helpname);
if (!helper) {
if (!strcmp(helpname, ""))
helper = NULL;
else
return -EINVAL;
}
if (help->helper) {
if (!helper) {
/* we had a helper before ... */
nf_ct_remove_expectations(ct);
help->helper = NULL;
} else {
/* need to zero data of old helper */
memset(&help->help, 0, sizeof(help->help));
}
}
help->helper = helper;
return 0;
}
static inline int
ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
{
u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
if (!del_timer(&ct->timeout))
return -ETIME;
ct->timeout.expires = jiffies + timeout * HZ;
add_timer(&ct->timeout);
return 0;
}
static inline int
ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
{
struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
struct nf_conntrack_l4proto *l4proto;
u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
int err = 0;
nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
l4proto = nf_ct_l4proto_find_get(l3num, npt);
if (l4proto->from_nfattr)
err = l4proto->from_nfattr(tb, ct);
nf_ct_l4proto_put(l4proto);
return err;
}
static int
ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
{
int err;
if (cda[CTA_HELP-1]) {
err = ctnetlink_change_helper(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_TIMEOUT-1]) {
err = ctnetlink_change_timeout(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_STATUS-1]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_PROTOINFO-1]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
return err;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK-1])
ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
#endif
return 0;
}
static int
ctnetlink_create_conntrack(struct nfattr *cda[],
struct nf_conntrack_tuple *otuple,
struct nf_conntrack_tuple *rtuple)
{
struct nf_conn *ct;
int err = -EINVAL;
struct nf_conn_help *help;
ct = nf_conntrack_alloc(otuple, rtuple);
if (ct == NULL || IS_ERR(ct))
return -ENOMEM;
if (!cda[CTA_TIMEOUT-1])
goto err;
ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
ct->status |= IPS_CONFIRMED;
if (cda[CTA_STATUS-1]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
goto err;
}
if (cda[CTA_PROTOINFO-1]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
goto err;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK-1])
ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
#endif
help = nfct_help(ct);
if (help)
help->helper = nf_ct_helper_find_get(rtuple);
add_timer(&ct->timeout);
nf_conntrack_hash_insert(ct);
if (help && help->helper)
nf_ct_helper_put(help->helper);
return 0;
err:
nf_conntrack_free(ct);
return err;
}
static int
ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_tuple otuple, rtuple;
struct nf_conntrack_tuple_hash *h = NULL;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
return -EINVAL;
if (cda[CTA_TUPLE_ORIG-1]) {
err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
if (err < 0)
return err;
}
if (cda[CTA_TUPLE_REPLY-1]) {
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
if (err < 0)
return err;
}
write_lock_bh(&nf_conntrack_lock);
if (cda[CTA_TUPLE_ORIG-1])
h = __nf_conntrack_find(&otuple, NULL);
else if (cda[CTA_TUPLE_REPLY-1])
h = __nf_conntrack_find(&rtuple, NULL);
if (h == NULL) {
write_unlock_bh(&nf_conntrack_lock);
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE)
err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
return err;
}
/* implicit ‘else‘ */
/* we only allow nat config for new conntracks */
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
err = -EINVAL;
goto out_unlock;
}
/* We manipulate the conntrack inside the global conntrack table lock,
* so there‘s no need to increase the refcount */
err = -EEXIST;
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
out_unlock:
write_unlock_bh(&nf_conntrack_lock);
return err;
}
/***********************************************************************
* EXPECT
***********************************************************************/
static inline int
ctnetlink_exp_dump_tuple(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
enum ctattr_expect type)
{
struct nfattr *nest_parms = NFA_NEST(skb, type);
if (ctnetlink_dump_tuples(skb, tuple) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_exp_dump_mask(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *mask)
{
int ret;
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
nf_ct_l3proto_put(l3proto);
if (unlikely(ret < 0))
goto nfattr_failure;
l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto);
nf_ct_l4proto_put(l4proto);
if (unlikely(ret < 0))
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_exp_dump_expect(struct sk_buff *skb,
const struct nf_conntrack_expect *exp)
{
struct nf_conn *master = exp->master;
__be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
__be32 id = htonl(exp->id);
if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
goto nfattr_failure;
if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
goto nfattr_failure;
if (ctnetlink_exp_dump_tuple(skb,
&master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
CTA_EXPECT_MASTER) < 0)
goto nfattr_failure;
NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
return 0;
nfattr_failure:
return -1;
}
static int
ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
int event,
int nowait,
const struct nf_conntrack_expect *exp)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
unsigned char *b;
b = skb->tail;
event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
nfmsg->nfgen_family = exp->tuple.src.l3num;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
goto nfattr_failure;
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
nfattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static int ctnetlink_expect_event(struct notifier_block *this,
unsigned long events, void *ptr)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
struct sk_buff *skb;
unsigned int type;
unsigned char *b;
int flags = 0;
if (events & IPEXP_NEW) {
type = IPCTNL_MSG_EXP_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
} else
return NOTIFY_DONE;
if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
return NOTIFY_DONE;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb)
return NOTIFY_DONE;
b = skb->tail;
type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = flags;
nfmsg->nfgen_family = exp->tuple.src.l3num;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
goto nfattr_failure;
nlh->nlmsg_len = skb->tail - b;
nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
return NOTIFY_DONE;
nlmsg_failure:
nfattr_failure:
kfree_skb(skb);
return NOTIFY_DONE;
}
#endif
static int
ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nf_conntrack_expect *exp = NULL;
struct list_head *i;
u_int32_t *id = (u_int32_t *) &cb->args[0];
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
u_int8_t l3proto = nfmsg->nfgen_family;
read_lock_bh(&nf_conntrack_lock);
list_for_each_prev(i, &nf_conntrack_expect_list) {
exp = (struct nf_conntrack_expect *) i;
if (l3proto && exp->tuple.src.l3num != l3proto)
continue;
if (exp->id <= *id)
continue;
if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_EXP_NEW,
1, exp) < 0)
goto out;
*id = exp->id;
}
out:
read_unlock_bh(&nf_conntrack_lock);
return skb->len;
}
static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
[CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
[CTA_EXPECT_ID-1] = sizeof(u_int32_t)
};
static int
ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_tuple tuple;
struct nf_conntrack_expect *exp;
struct sk_buff *skb2;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
return -EINVAL;
if (nlh->nlmsg_flags & NLM_F_DUMP) {
u32 rlen;
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
ctnetlink_exp_dump_table,
ctnetlink_done)) != 0)
return -EINVAL;
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
skb_pull(skb, rlen);
return 0;
}
if (cda[CTA_EXPECT_MASTER-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
else
return -EINVAL;
if (err < 0)
return err;
exp = nf_conntrack_expect_find_get(&tuple);
if (!exp)
return -ENOENT;
if (cda[CTA_EXPECT_ID-1]) {
__be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
if (exp->id != ntohl(id)) {
nf_conntrack_expect_put(exp);
return -ENOENT;
}
}
err = -ENOMEM;
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb2)
goto out;
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1, exp);
if (err <= 0)
goto free;
nf_conntrack_expect_put(exp);
return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
free:
kfree_skb(skb2);
out:
nf_conntrack_expect_put(exp);
return err;
}
static int
ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_expect *exp, *tmp;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_helper *h;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err;
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
return -EINVAL;
if (cda[CTA_EXPECT_TUPLE-1]) {
/* delete a single expect by tuple */
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;
/* bump usage count to 2 */
exp = nf_conntrack_expect_find_get(&tuple);
if (!exp)
return -ENOENT;
if (cda[CTA_EXPECT_ID-1]) {
__be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
if (exp->id != ntohl(id)) {
nf_conntrack_expect_put(exp);
return -ENOENT;
}
}
/* after list removal, usage count == 1 */
nf_conntrack_unexpect_related(exp);
/* have to put what we ‘get‘ above.
* after this line usage count == 0 */
nf_conntrack_expect_put(exp);
} else if (cda[CTA_EXPECT_HELP_NAME-1]) {
char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
/* delete all expectations for this helper */
write_lock_bh(&nf_conntrack_lock);
h = __nf_conntrack_helper_find_byname(name);
if (!h) {
write_unlock_bh(&nf_conntrack_lock);
return -EINVAL;
}
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
list) {
struct nf_conn_help *m_help = nfct_help(exp->master);
if (m_help->helper == h
&& del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
nf_conntrack_expect_put(exp);
}
}
write_unlock_bh(&nf_conntrack_lock);
} else {
/* This basically means we have to flush everything*/
write_lock_bh(&nf_conntrack_lock);
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
list) {
if (del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
nf_conntrack_expect_put(exp);
}
}
write_unlock_bh(&nf_conntrack_lock);
}
return 0;
}
static int
ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
{
return -EOPNOTSUPP;
}
static int
ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
{
struct nf_conntrack_tuple tuple, mask, master_tuple;
struct nf_conntrack_tuple_hash *h = NULL;
struct nf_conntrack_expect *exp;
struct nf_conn *ct;
struct nf_conn_help *help;
int err = 0;
/* caller guarantees that those three CTA_EXPECT_* exist */
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
if (err < 0)
return err;
/* Look for master conntrack of this expectation */
h = nf_conntrack_find_get(&master_tuple, NULL);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
help = nfct_help(ct);
if (!help || !help->helper) {
/* such conntrack hasn‘t got any helper, abort */
err = -EINVAL;
goto out;
}
exp = nf_conntrack_expect_alloc(ct);
if (!exp) {
err = -ENOMEM;
goto out;
}
exp->expectfn = NULL;
exp->flags = 0;
exp->master = ct;
exp->helper = NULL;
memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
err = nf_conntrack_expect_related(exp);
nf_conntrack_expect_put(exp);
out:
nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
return err;
}
static int
ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_tuple tuple;
struct nf_conntrack_expect *exp;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
return -EINVAL;
if (!cda[CTA_EXPECT_TUPLE-1]
|| !cda[CTA_EXPECT_MASK-1]
|| !cda[CTA_EXPECT_MASTER-1])
return -EINVAL;
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;
write_lock_bh(&nf_conntrack_lock);
exp = __nf_conntrack_expect_find(&tuple);
if (!exp) {
write_unlock_bh(&nf_conntrack_lock);
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE)
err = ctnetlink_create_expect(cda, u3);
return err;
}
err = -EEXIST;
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_expect(exp, cda);
write_unlock_bh(&nf_conntrack_lock);
return err;
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static struct notifier_block ctnl_notifier = {
.notifier_call = ctnetlink_conntrack_event,
};
static struct notifier_block ctnl_notifier_exp = {
.notifier_call = ctnetlink_expect_event,
};
#endif
static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
[IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
.attr_count = CTA_MAX, },
[IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
.attr_count = CTA_MAX, },
[IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
.attr_count = CTA_MAX, },
[IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
.attr_count = CTA_MAX, },
};
static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
[IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
.attr_count = CTA_EXPECT_MAX, },
[IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
.attr_count = CTA_EXPECT_MAX, },
[IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
.attr_count = CTA_EXPECT_MAX, },
};
static struct nfnetlink_subsystem ctnl_subsys = {
.name = "conntrack",
.subsys_id = NFNL_SUBSYS_CTNETLINK,
.cb_count = IPCTNL_MSG_MAX,
.cb = ctnl_cb,
};
static struct nfnetlink_subsystem ctnl_exp_subsys = {
.name = "conntrack_expect",
.subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
.cb_count = IPCTNL_MSG_EXP_MAX,
.cb = ctnl_exp_cb,
};
MODULE_ALIAS("ip_conntrack_netlink");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
static int __init ctnetlink_init(void)
{
int ret;
printk("ctnetlink v%s: registering with nfnetlink.\n", version);
ret = nfnetlink_subsys_register(&ctnl_subsys);
if (ret < 0) {
printk("ctnetlink_init: cannot register with nfnetlink.\n");
goto err_out;
}
ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
if (ret < 0) {
printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
goto err_unreg_subsys;
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
ret = nf_conntrack_register_notifier(&ctnl_notifier);
if (ret < 0) {
printk("ctnetlink_init: cannot register notifier.\n");
goto err_unreg_exp_subsys;
}
ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
if (ret < 0) {
printk("ctnetlink_init: cannot expect register notifier.\n");
goto err_unreg_notifier;
}
#endif
return 0;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
err_unreg_notifier:
nf_conntrack_unregister_notifier(&ctnl_notifier);
err_unreg_exp_subsys:
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
#endif
err_unreg_subsys:
nfnetlink_subsys_unregister(&ctnl_subsys);
err_out:
return ret;
}
static void __exit ctnetlink_exit(void)
{
printk("ctnetlink: unregistering from nfnetlink.\n");
#ifdef CONFIG_NF_CONNTRACK_EVENTS
nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
nf_conntrack_unregister_notifier(&ctnl_notifier);
#endif
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
nfnetlink_subsys_unregister(&ctnl_subsys);
return;
}
module_init(ctnetlink_init);
module_exit(ctnetlink_exit);
时间： 2024-12-28 02:30:00