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nf_conntrack_netlink.c
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nf_conntrack_netlink.c
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/* Connection tracking via netlink socket. Allows for user space
* protocol helpers and general trouble making from userspace.
*
* (C) 2001 by Jay Schulist <jschlst@samba.org>
* (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
* (C) 2003 by Patrick Mchardy <kaber@trash.net>
* (C) 2005-2011 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rculist.h>
#include <linux/rculist_nulls.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/security.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/netfilter.h>
#include <net/netlink.h>
#include <net/sock.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>
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_timestamp.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 nlattr *nest_parms;
nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
if (likely(l4proto->tuple_to_nlattr))
ret = l4proto->tuple_to_nlattr(skb, tuple);
nla_nest_end(skb, nest_parms);
return ret;
nla_put_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 nlattr *nest_parms;
nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (likely(l3proto->tuple_to_nlattr))
ret = l3proto->tuple_to_nlattr(skb, tuple);
nla_nest_end(skb, nest_parms);
return ret;
nla_put_failure:
return -1;
}
static 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(tuple->src.l3num);
ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
if (unlikely(ret < 0))
return ret;
l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
return ret;
}
static inline int
ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
return 0;
nla_put_failure:
return -1;
}
static inline int
ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
{
long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
if (timeout < 0)
timeout = 0;
NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
return 0;
nla_put_failure:
return -1;
}
static inline int
ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
{
struct nf_conntrack_l4proto *l4proto;
struct nlattr *nest_proto;
int ret;
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
if (!l4proto->to_nlattr)
return 0;
nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
if (!nest_proto)
goto nla_put_failure;
ret = l4proto->to_nlattr(skb, nest_proto, ct);
nla_nest_end(skb, nest_proto);
return ret;
nla_put_failure:
return -1;
}
static inline int
ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_helper;
const struct nf_conn_help *help = nfct_help(ct);
struct nf_conntrack_helper *helper;
if (!help)
return 0;
helper = rcu_dereference(help->helper);
if (!helper)
goto out;
nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
if (!nest_helper)
goto nla_put_failure;
NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
if (helper->to_nlattr)
helper->to_nlattr(skb, ct);
nla_nest_end(skb, nest_helper);
out:
return 0;
nla_put_failure:
return -1;
}
static int
dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
enum ip_conntrack_dir dir)
{
enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
struct nlattr *nest_count;
nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
if (!nest_count)
goto nla_put_failure;
NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts));
NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes));
nla_nest_end(skb, nest_count);
return 0;
nla_put_failure:
return -1;
}
static int
ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
enum ip_conntrack_dir dir, int type)
{
struct nf_conn_counter *acct;
u64 pkts, bytes;
acct = nf_conn_acct_find(ct);
if (!acct)
return 0;
if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
pkts = atomic64_xchg(&acct[dir].packets, 0);
bytes = atomic64_xchg(&acct[dir].bytes, 0);
} else {
pkts = atomic64_read(&acct[dir].packets);
bytes = atomic64_read(&acct[dir].bytes);
}
return dump_counters(skb, pkts, bytes, dir);
}
static int
ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_count;
const struct nf_conn_tstamp *tstamp;
tstamp = nf_conn_tstamp_find(ct);
if (!tstamp)
return 0;
nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
if (!nest_count)
goto nla_put_failure;
NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
if (tstamp->stop != 0) {
NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
cpu_to_be64(tstamp->stop));
}
nla_nest_end(skb, nest_count);
return 0;
nla_put_failure:
return -1;
}
#ifdef CONFIG_NF_CONNTRACK_MARK
static inline int
ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
return 0;
nla_put_failure:
return -1;
}
#else
#define ctnetlink_dump_mark(a, b) (0)
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
static inline int
ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_secctx;
int len, ret;
char *secctx;
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
if (ret)
return 0;
ret = -1;
nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
if (!nest_secctx)
goto nla_put_failure;
NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
nla_nest_end(skb, nest_secctx);
ret = 0;
nla_put_failure:
security_release_secctx(secctx, len);
return ret;
}
#else
#define ctnetlink_dump_secctx(a, b) (0)
#endif
#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
static inline int
ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nlattr *nest_parms;
if (!(ct->status & IPS_EXPECTED))
return 0;
nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
#ifdef CONFIG_NF_NAT_NEEDED
static int
dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
{
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
htonl(natseq->correction_pos));
NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
htonl(natseq->offset_before));
NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
htonl(natseq->offset_after));
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static inline int
ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nf_nat_seq *natseq;
struct nf_conn_nat *nat = nfct_nat(ct);
if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
return 0;
natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
return -1;
natseq = &nat->seq[IP_CT_DIR_REPLY];
if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
return -1;
return 0;
}
#else
#define ctnetlink_dump_nat_seq_adj(a, b) (0)
#endif
static inline int
ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
return 0;
nla_put_failure:
return -1;
}
static inline int
ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
return 0;
nla_put_failure:
return -1;
}
static int
ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, u32 type,
struct nf_conn *ct)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nlattr *nest_parms;
unsigned int flags = pid ? NLM_F_MULTI : 0, event;
event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = nf_ct_l3num(ct);
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (nf_ct_zone(ct))
NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
if (ctnetlink_dump_status(skb, ct) < 0 ||
ctnetlink_dump_timeout(skb, ct) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL, type) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY, type) < 0 ||
ctnetlink_dump_timestamp(skb, ct) < 0 ||
ctnetlink_dump_protoinfo(skb, ct) < 0 ||
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, ct) < 0 ||
ctnetlink_dump_secctx(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0 ||
ctnetlink_dump_master(skb, ct) < 0 ||
ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nlmsg_failure:
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static inline size_t
ctnetlink_proto_size(const struct nf_conn *ct)
{
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
size_t len = 0;
rcu_read_lock();
l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
len += l3proto->nla_size;
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
len += l4proto->nla_size;
rcu_read_unlock();
return len;
}
static inline size_t
ctnetlink_counters_size(const struct nf_conn *ct)
{
if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
return 0;
return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
+ 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
+ 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
;
}
static inline int
ctnetlink_secctx_size(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;
ret = security_secid_to_secctx(ct->secmark, NULL, &len);
if (ret)
return 0;
return nla_total_size(0) /* CTA_SECCTX */
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
#else
return 0;
#endif
}
static inline size_t
ctnetlink_timestamp_size(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
return 0;
return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
#else
return 0;
#endif
}
static inline size_t
ctnetlink_nlmsg_size(const struct nf_conn *ct)
{
return NLMSG_ALIGN(sizeof(struct nfgenmsg))
+ 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
+ 3 * nla_total_size(0) /* CTA_TUPLE_IP */
+ 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
+ 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
+ nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
+ nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
+ ctnetlink_counters_size(ct)
+ ctnetlink_timestamp_size(ct)
+ nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
+ nla_total_size(0) /* CTA_PROTOINFO */
+ nla_total_size(0) /* CTA_HELP */
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
+ ctnetlink_secctx_size(ct)
#ifdef CONFIG_NF_NAT_NEEDED
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
+ 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
#endif
#ifdef CONFIG_NF_CONNTRACK_MARK
+ nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
#endif
+ ctnetlink_proto_size(ct)
;
}
static int
ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
{
struct net *net;
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nlattr *nest_parms;
struct nf_conn *ct = item->ct;
struct sk_buff *skb;
unsigned int type;
unsigned int flags = 0, group;
int err;
/* ignore our fake conntrack entry */
if (nf_ct_is_untracked(ct))
return 0;
if (events & (1 << IPCT_DESTROY)) {
type = IPCTNL_MSG_CT_DELETE;
group = NFNLGRP_CONNTRACK_DESTROY;
} else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
type = IPCTNL_MSG_CT_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
group = NFNLGRP_CONNTRACK_NEW;
} else if (events) {
type = IPCTNL_MSG_CT_NEW;
group = NFNLGRP_CONNTRACK_UPDATE;
} else
return 0;
net = nf_ct_net(ct);
if (!item->report && !nfnetlink_has_listeners(net, group))
return 0;
skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
if (skb == NULL)
goto errout;
type |= NFNL_SUBSYS_CTNETLINK << 8;
nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = nf_ct_l3num(ct);
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
rcu_read_lock();
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (nf_ct_zone(ct))
NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
if (ctnetlink_dump_id(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_status(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_DESTROY)) {
if (ctnetlink_dump_counters(skb, ct,
IP_CT_DIR_ORIGINAL, type) < 0 ||
ctnetlink_dump_counters(skb, ct,
IP_CT_DIR_REPLY, type) < 0 ||
ctnetlink_dump_timestamp(skb, ct) < 0)
goto nla_put_failure;
} else {
if (ctnetlink_dump_timeout(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_PROTOINFO)
&& ctnetlink_dump_protoinfo(skb, ct) < 0)
goto nla_put_failure;
if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if ((events & (1 << IPCT_SECMARK) || ct->secmark)
&& ctnetlink_dump_secctx(skb, ct) < 0)
goto nla_put_failure;
#endif
if (events & (1 << IPCT_RELATED) &&
ctnetlink_dump_master(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_NATSEQADJ) &&
ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
goto nla_put_failure;
}
#ifdef CONFIG_NF_CONNTRACK_MARK
if ((events & (1 << IPCT_MARK) || ct->mark)
&& ctnetlink_dump_mark(skb, ct) < 0)
goto nla_put_failure;
#endif
rcu_read_unlock();
nlmsg_end(skb, nlh);
err = nfnetlink_send(skb, net, item->pid, group, item->report,
GFP_ATOMIC);
if (err == -ENOBUFS || err == -EAGAIN)
return -ENOBUFS;
return 0;
nla_put_failure:
rcu_read_unlock();
nlmsg_cancel(skb, nlh);
nlmsg_failure:
kfree_skb(skb);
errout:
if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
return -ENOBUFS;
return 0;
}
#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;
}
static int
ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct nf_conn *ct, *last;
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
u_int8_t l3proto = nfmsg->nfgen_family;
spin_lock_bh(&nf_conntrack_lock);
last = (struct nf_conn *)cb->args[1];
for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
restart:
hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
hnnode) {
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 && nf_ct_l3num(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,
NFNL_MSG_TYPE(
cb->nlh->nlmsg_type),
ct) < 0) {
nf_conntrack_get(&ct->ct_general);
cb->args[1] = (unsigned long)ct;
goto out;
}
}
if (cb->args[1]) {
cb->args[1] = 0;
goto restart;
}
}
out:
spin_unlock_bh(&nf_conntrack_lock);
if (last)
nf_ct_put(last);
return skb->len;
}
static inline int
ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
{
struct nlattr *tb[CTA_IP_MAX+1];
struct nf_conntrack_l3proto *l3proto;
int ret = 0;
nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
rcu_read_lock();
l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
if (likely(l3proto->nlattr_to_tuple)) {
ret = nla_validate_nested(attr, CTA_IP_MAX,
l3proto->nla_policy);
if (ret == 0)
ret = l3proto->nlattr_to_tuple(tb, tuple);
}
rcu_read_unlock();
return ret;
}
static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
[CTA_PROTO_NUM] = { .type = NLA_U8 },
};
static inline int
ctnetlink_parse_tuple_proto(struct nlattr *attr,
struct nf_conntrack_tuple *tuple)
{
struct nlattr *tb[CTA_PROTO_MAX+1];
struct nf_conntrack_l4proto *l4proto;
int ret = 0;
ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
if (ret < 0)
return ret;
if (!tb[CTA_PROTO_NUM])
return -EINVAL;
tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
rcu_read_lock();
l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
if (likely(l4proto->nlattr_to_tuple)) {
ret = nla_validate_nested(attr, CTA_PROTO_MAX,
l4proto->nla_policy);
if (ret == 0)
ret = l4proto->nlattr_to_tuple(tb, tuple);
}
rcu_read_unlock();
return ret;
}
static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
[CTA_TUPLE_IP] = { .type = NLA_NESTED },
[CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
};
static int
ctnetlink_parse_tuple(const struct nlattr * const cda[],
struct nf_conntrack_tuple *tuple,
enum ctattr_type type, u_int8_t l3num)
{
struct nlattr *tb[CTA_TUPLE_MAX+1];
int err;
memset(tuple, 0, sizeof(*tuple));
nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
if (!tb[CTA_TUPLE_IP])
return -EINVAL;
tuple->src.l3num = l3num;
err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
if (err < 0)
return err;
if (!tb[CTA_TUPLE_PROTO])
return -EINVAL;
err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], 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;
}
static int
ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
{
if (attr)
#ifdef CONFIG_NF_CONNTRACK_ZONES
*zone = ntohs(nla_get_be16(attr));
#else
return -EOPNOTSUPP;
#endif
else
*zone = 0;
return 0;
}
static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
[CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
};
static inline int
ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
{
struct nlattr *tb[CTA_HELP_MAX+1];
nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
if (!tb[CTA_HELP_NAME])
return -EINVAL;
*helper_name = nla_data(tb[CTA_HELP_NAME]);
return 0;
}
static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
[CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
[CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
[CTA_STATUS] = { .type = NLA_U32 },
[CTA_PROTOINFO] = { .type = NLA_NESTED },
[CTA_HELP] = { .type = NLA_NESTED },
[CTA_NAT_SRC] = { .type = NLA_NESTED },
[CTA_TIMEOUT] = { .type = NLA_U32 },
[CTA_MARK] = { .type = NLA_U32 },
[CTA_ID] = { .type = NLA_U32 },
[CTA_NAT_DST] = { .type = NLA_NESTED },
[CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
[CTA_ZONE] = { .type = NLA_U16 },
};
static int
ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[])
{
struct net *net = sock_net(ctnl);
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;
u16 zone;
int err;
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
if (err < 0)
return err;
if (cda[CTA_TUPLE_ORIG])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
else if (cda[CTA_TUPLE_REPLY])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
else {
/* Flush the whole table */
nf_conntrack_flush_report(net,
NETLINK_CB(skb).pid,
nlmsg_report(nlh));
return 0;
}
if (err < 0)
return err;
h = nf_conntrack_find_get(net, zone, &tuple);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
if (cda[CTA_ID]) {
u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
if (id != (u32)(unsigned long)ct) {
nf_ct_put(ct);
return -ENOENT;
}
}
if (del_timer(&ct->timeout)) {
if (nf_conntrack_event_report(IPCT_DESTROY, ct,
NETLINK_CB(skb).pid,
nlmsg_report(nlh)) < 0) {
nf_ct_delete_from_lists(ct);
/* we failed to report the event, try later */
nf_ct_insert_dying_list(ct);
nf_ct_put(ct);
return 0;
}
/* death_by_timeout would report the event again */
set_bit(IPS_DYING_BIT, &ct->status);
nf_ct_delete_from_lists(ct);
nf_ct_put(ct);
}
nf_ct_put(ct);
return 0;
}
static int
ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[])
{
struct net *net = sock_net(ctnl);
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;
u16 zone;
int err;
if (nlh->nlmsg_flags & NLM_F_DUMP)
return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
ctnetlink_done, 0);
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
if (err < 0)
return err;
if (cda[CTA_TUPLE_ORIG])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
else if (cda[CTA_TUPLE_REPLY])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
else
return -EINVAL;
if (err < 0)
return err;
h = nf_conntrack_find_get(net, zone, &tuple);
if (!h)