blob: 1213beb5a7146e7504c80b86bd0444306a4a12db [file] [log] [blame]
/* 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) 2005-2012 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_seqadj.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>
#include <net/netfilter/nf_conntrack_labels.h>
#include <net/netfilter/nf_conntrack_synproxy.h>
#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_helper.h>
#endif
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
MODULE_LICENSE("GPL");
static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
const 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;
if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
goto nla_put_failure;
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 int ipv4_tuple_to_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
return -EMSGSIZE;
return 0;
}
static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
return -EMSGSIZE;
return 0;
}
static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
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;
switch (tuple->src.l3num) {
case NFPROTO_IPV4:
ret = ipv4_tuple_to_nlattr(skb, tuple);
break;
case NFPROTO_IPV6:
ret = ipv6_tuple_to_nlattr(skb, tuple);
break;
}
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)
{
const struct nf_conntrack_l4proto *l4proto;
int ret;
rcu_read_lock();
ret = ctnetlink_dump_tuples_ip(skb, tuple);
if (ret >= 0) {
l4proto = __nf_ct_l4proto_find(tuple->dst.protonum);
ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
}
rcu_read_unlock();
return ret;
}
static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
const struct nf_conntrack_zone *zone, int dir)
{
if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
return 0;
if (nla_put_be16(skb, attrtype, htons(zone->id)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
{
if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
{
long timeout = nf_ct_expires(ct) / HZ;
if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
{
const struct nf_conntrack_l4proto *l4proto;
struct nlattr *nest_proto;
int ret;
l4proto = __nf_ct_l4proto_find(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 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;
if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
goto nla_put_failure;
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, struct nf_conn_acct *acct,
enum ip_conntrack_dir dir, int type)
{
enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
struct nf_conn_counter *counter = acct->counter;
struct nlattr *nest_count;
u64 pkts, bytes;
if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
pkts = atomic64_xchg(&counter[dir].packets, 0);
bytes = atomic64_xchg(&counter[dir].bytes, 0);
} else {
pkts = atomic64_read(&counter[dir].packets);
bytes = atomic64_read(&counter[dir].bytes);
}
nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
if (!nest_count)
goto nla_put_failure;
if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
CTA_COUNTERS_PAD) ||
nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
CTA_COUNTERS_PAD))
goto nla_put_failure;
nla_nest_end(skb, nest_count);
return 0;
nla_put_failure:
return -1;
}
static int
ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
{
struct nf_conn_acct *acct = nf_conn_acct_find(ct);
if (!acct)
return 0;
if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
return -1;
if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
return -1;
return 0;
}
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;
if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
CTA_TIMESTAMP_PAD) ||
(tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
cpu_to_be64(tstamp->stop),
CTA_TIMESTAMP_PAD)))
goto nla_put_failure;
nla_nest_end(skb, nest_count);
return 0;
nla_put_failure:
return -1;
}
#ifdef CONFIG_NF_CONNTRACK_MARK
static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
{
if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
#else
#define ctnetlink_dump_mark(a, b) (0)
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
static 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;
if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
goto nla_put_failure;
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
#ifdef CONFIG_NF_CONNTRACK_LABELS
static inline int ctnetlink_label_size(const struct nf_conn *ct)
{
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
if (!labels)
return 0;
return nla_total_size(sizeof(labels->bits));
}
static int
ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
{
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
unsigned int i;
if (!labels)
return 0;
i = 0;
do {
if (labels->bits[i] != 0)
return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
labels->bits);
i++;
} while (i < ARRAY_SIZE(labels->bits));
return 0;
}
#else
#define ctnetlink_dump_labels(a, b) (0)
#define ctnetlink_label_size(a) (0)
#endif
#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
static 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;
}
static int
dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
{
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
htonl(seq->correction_pos)) ||
nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
htonl(seq->offset_before)) ||
nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
htonl(seq->offset_after)))
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
{
struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
struct nf_ct_seqadj *seq;
if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
return 0;
spin_lock_bh(&ct->lock);
seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
goto err;
seq = &seqadj->seq[IP_CT_DIR_REPLY];
if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
goto err;
spin_unlock_bh(&ct->lock);
return 0;
err:
spin_unlock_bh(&ct->lock);
return -1;
}
static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
{
struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
struct nlattr *nest_parms;
if (!synproxy)
return 0;
nest_parms = nla_nest_start(skb, CTA_SYNPROXY | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
{
if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
{
if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static int
ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
struct nf_conn *ct)
{
const struct nf_conntrack_zone *zone;
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nlattr *nest_parms;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
nlh = nlmsg_put(skb, portid, 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;
zone = nf_ct_zone(ct);
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;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_ORIG) < 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;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_REPL) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
NF_CT_DEFAULT_ZONE_DIR) < 0)
goto nla_put_failure;
if (ctnetlink_dump_status(skb, ct) < 0 ||
ctnetlink_dump_timeout(skb, ct) < 0 ||
ctnetlink_dump_acct(skb, ct, 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_labels(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0 ||
ctnetlink_dump_master(skb, ct) < 0 ||
ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
ctnetlink_dump_ct_synproxy(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;
}
static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
[CTA_IP_V4_SRC] = { .type = NLA_U32 },
[CTA_IP_V4_DST] = { .type = NLA_U32 },
[CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
[CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
};
#if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
static size_t ctnetlink_proto_size(const struct nf_conn *ct)
{
const struct nf_conntrack_l4proto *l4proto;
size_t len, len4 = 0;
len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
len *= 3u; /* ORIG, REPLY, MASTER */
l4proto = __nf_ct_l4proto_find(nf_ct_protonum(ct));
len += l4proto->nlattr_size;
if (l4proto->nlattr_tuple_size) {
len4 = l4proto->nlattr_tuple_size();
len4 *= 3u; /* ORIG, REPLY, MASTER */
}
return len + len4;
}
#endif
static inline size_t ctnetlink_acct_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_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
+ 2 * nla_total_size_64bit(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_64bit(sizeof(uint64_t));
#else
return 0;
#endif
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
static 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_acct_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
#ifdef CONFIG_NF_CONNTRACK_ZONES
+ nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
#endif
+ ctnetlink_proto_size(ct)
+ ctnetlink_label_size(ct)
;
}
static int
ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
{
const struct nf_conntrack_zone *zone;
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;
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_msg_type(NFNL_SUBSYS_CTNETLINK, type);
nlh = nlmsg_put(skb, item->portid, 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;
zone = nf_ct_zone(ct);
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;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_ORIG) < 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;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_REPL) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
NF_CT_DEFAULT_ZONE_DIR) < 0)
goto nla_put_failure;
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_acct(skb, ct, 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_LABEL) &&
ctnetlink_dump_labels(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_RELATED) &&
ctnetlink_dump_master(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_SEQADJ) &&
ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
goto nla_put_failure;
if (events & (1 << IPCT_SYNPROXY) &&
ctnetlink_dump_ct_synproxy(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
nlmsg_end(skb, nlh);
err = nfnetlink_send(skb, net, item->portid, group, item->report,
GFP_ATOMIC);
if (err == -ENOBUFS || err == -EAGAIN)
return -ENOBUFS;
return 0;
nla_put_failure:
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]);
kfree(cb->data);
return 0;
}
struct ctnetlink_filter {
u8 family;
struct {
u_int32_t val;
u_int32_t mask;
} mark;
};
static struct ctnetlink_filter *
ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
{
struct ctnetlink_filter *filter;
#ifndef CONFIG_NF_CONNTRACK_MARK
if (cda[CTA_MARK] && cda[CTA_MARK_MASK])
return ERR_PTR(-EOPNOTSUPP);
#endif
filter = kzalloc(sizeof(*filter), GFP_KERNEL);
if (filter == NULL)
return ERR_PTR(-ENOMEM);
filter->family = family;
#ifdef CONFIG_NF_CONNTRACK_MARK
if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
}
#endif
return filter;
}
static int ctnetlink_start(struct netlink_callback *cb)
{
const struct nlattr * const *cda = cb->data;
struct ctnetlink_filter *filter = NULL;
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
u8 family = nfmsg->nfgen_family;
if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
filter = ctnetlink_alloc_filter(cda, family);
if (IS_ERR(filter))
return PTR_ERR(filter);
}
cb->data = filter;
return 0;
}
static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
{
struct ctnetlink_filter *filter = data;
if (filter == NULL)
goto out;
/* Match entries of a given L3 protocol number.
* If it is not specified, ie. l3proto == 0,
* then match everything.
*/
if (filter->family && nf_ct_l3num(ct) != filter->family)
goto ignore_entry;
#ifdef CONFIG_NF_CONNTRACK_MARK
if ((ct->mark & filter->mark.mask) != filter->mark.val)
goto ignore_entry;
#endif
out:
return 1;
ignore_entry:
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 nf_conn *nf_ct_evict[8];
int res, i;
spinlock_t *lockp;
last = (struct nf_conn *)cb->args[1];
i = 0;
local_bh_disable();
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
restart:
while (i) {
i--;
if (nf_ct_should_gc(nf_ct_evict[i]))
nf_ct_kill(nf_ct_evict[i]);
nf_ct_put(nf_ct_evict[i]);
}
lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
nf_conntrack_lock(lockp);
if (cb->args[0] >= nf_conntrack_htable_size) {
spin_unlock(lockp);
goto out;
}
hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
hnnode) {
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_ct_tuplehash_to_ctrack(h);
if (nf_ct_is_expired(ct)) {
if (i < ARRAY_SIZE(nf_ct_evict) &&
atomic_inc_not_zero(&ct->ct_general.use))
nf_ct_evict[i++] = ct;
continue;
}
if (!net_eq(net, nf_ct_net(ct)))
continue;
if (cb->args[1]) {
if (ct != last)
continue;
cb->args[1] = 0;
}
if (!ctnetlink_filter_match(ct, cb->data))
continue;
rcu_read_lock();
res =
ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
ct);
rcu_read_unlock();
if (res < 0) {
nf_conntrack_get(&ct->ct_general);
cb->args[1] = (unsigned long)ct;
spin_unlock(lockp);
goto out;
}
}
spin_unlock(lockp);
if (cb->args[1]) {
cb->args[1] = 0;
goto restart;
}
}
out:
local_bh_enable();
if (last) {
/* nf ct hash resize happened, now clear the leftover. */
if ((struct nf_conn *)cb->args[1] == last)
cb->args[1] = 0;
nf_ct_put(last);
}
while (i) {
i--;
if (nf_ct_should_gc(nf_ct_evict[i]))
nf_ct_kill(nf_ct_evict[i]);
nf_ct_put(nf_ct_evict[i]);
}
return skb->len;
}
static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *t)
{
if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
return -EINVAL;
t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
return 0;
}
static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *t)
{
if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
return -EINVAL;
t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
return 0;
}
static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
struct nf_conntrack_tuple *tuple)
{
struct nlattr *tb[CTA_IP_MAX+1];
int ret = 0;
ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL, NULL);
if (ret < 0)
return ret;
ret = nla_validate_nested(attr, CTA_IP_MAX,
cta_ip_nla_policy, NULL);
if (ret)
return ret;
switch (tuple->src.l3num) {
case NFPROTO_IPV4:
ret = ipv4_nlattr_to_tuple(tb, tuple);
break;
case NFPROTO_IPV6:
ret = ipv6_nlattr_to_tuple(tb, tuple);
break;
}
return ret;
}
static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
[CTA_PROTO_NUM] = { .type = NLA_U8 },
};
static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
struct nf_conntrack_tuple *tuple)
{
const struct nf_conntrack_l4proto *l4proto;
struct nlattr *tb[CTA_PROTO_MAX+1];
int ret = 0;
ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy,
NULL);
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->dst.protonum);
if (likely(l4proto->nlattr_to_tuple)) {
ret = nla_validate_nested(attr, CTA_PROTO_MAX,
l4proto->nla_policy, NULL);
if (ret == 0)
ret = l4proto->nlattr_to_tuple(tb, tuple);
}
rcu_read_unlock();
return ret;
}
static int
ctnetlink_parse_zone(const struct nlattr *attr,
struct nf_conntrack_zone *zone)
{
nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
NF_CT_DEFAULT_ZONE_DIR, 0);
#ifdef CONFIG_NF_CONNTRACK_ZONES
if (attr)
zone->id = ntohs(nla_get_be16(attr));
#else
if (attr)
return -EOPNOTSUPP;
#endif
return 0;
}
static int
ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
struct nf_conntrack_zone *zone)
{
int ret;
if (zone->id != NF_CT_DEFAULT_ZONE_ID)
return -EINVAL;
ret = ctnetlink_parse_zone(attr, zone);
if (ret < 0)
return ret;
if (type == CTA_TUPLE_REPLY)
zone->dir = NF_CT_ZONE_DIR_REPL;
else
zone->dir = NF_CT_ZONE_DIR_ORIG;
return 0;
}
static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
[CTA_TUPLE_IP] = { .type = NLA_NESTED },
[CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
[CTA_TUPLE_ZONE] = { .type = NLA_U16 },
};
static int
ctnetlink_parse_tuple(const struct nlattr * const cda[],
struct nf_conntrack_tuple *tuple, u32 type,
u_int8_t l3num, struct nf_conntrack_zone *zone)
{
struct nlattr *tb[CTA_TUPLE_MAX+1];
int err;
memset(tuple, 0, sizeof(*tuple));
err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy,
NULL);
if (err < 0)
return err;
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;
if (tb[CTA_TUPLE_ZONE]) {
if (!zone)
return -EINVAL;
err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
type, zone);
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 const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
[CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
.len = NF_CT_HELPER_NAME_LEN - 1 },
};
static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
struct nlattr **helpinfo)
{
int err;
struct nlattr *tb[CTA_HELP_MAX+1];
err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy, NULL);
if (err < 0)
return err;
if (!tb[CTA_HELP_NAME])
return -EINVAL;
*helper_name = nla_data(tb[CTA_HELP_NAME]);
if (tb[CTA_HELP_INFO])
*helpinfo = tb[CTA_HELP_INFO];
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_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
[CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
[CTA_ZONE] = { .type = NLA_U16 },
[CTA_MARK_MASK] = { .type = NLA_U32 },
[CTA_LABELS] = { .type = NLA_BINARY,
.len = NF_CT_LABELS_MAX_SIZE },
[CTA_LABELS_MASK] = { .type = NLA_BINARY,
.len = NF_CT_LABELS_MAX_SIZE },
};
static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
{
if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
return 0;
return ctnetlink_filter_match(ct, data);
}
static int ctnetlink_flush_conntrack(struct net *net,
const struct nlattr * const cda[],
u32 portid, int report, u8 family)
{
struct ctnetlink_filter *filter = NULL;
if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
filter = ctnetlink_alloc_filter(cda, family);
if (IS_ERR(filter))
return PTR_ERR(filter);
}
nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
portid, report);
kfree(filter);
return 0;
}
static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
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;
struct nf_conntrack_zone 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, &zone);
else if (cda[CTA_TUPLE_REPLY])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
u3, &zone);
else {
return ctnetlink_flush_conntrack(net, cda,
NETLINK_CB(skb).portid,
nlmsg_report(nlh), u3);
}
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 (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
nf_ct_put(ct);
return -EBUSY;
}
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;
}
}
nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
nf_ct_put(ct);
return 0;
}
static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
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;
struct nf_conntrack_zone zone;
int err;
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = ctnetlink_start,
.dump = ctnetlink_dump_table,
.done = ctnetlink_done,
.data = (void *)cda,
};
return netlink_dump_start(ctnl, skb, nlh, &c);
}
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, &zone);
else if (cda[CTA_TUPLE_REPLY])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
u3, &zone);
else
return -EINVAL;
if (err < 0)
return err;
h = nf_conntrack_find_get(net, &zone, &tuple);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
err = -ENOMEM;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (skb2 == NULL) {
nf_ct_put(ct);
return -ENOMEM;
}
rcu_read_lock();
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
rcu_read_unlock();
nf_ct_put(ct);
if (err <= 0)
goto free;
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
if (err < 0)
goto out;
return 0;
free:
kfree_skb(skb2);
out:
/* this avoids a loop in nfnetlink. */
return err == -EAGAIN ? -ENOBUFS : err;
}
static int ctnetlink_done_list(struct netlink_callback *cb)
{
if (cb->args[1])
nf_ct_put((struct nf_conn *)cb->args[1]);
return 0;
}
static int
ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
{
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;
int res;
int cpu;
struct hlist_nulls_head *list;
struct net *net = sock_net(skb->sk);
if (cb->args[2])
return 0;
last = (struct nf_conn *)cb->args[1];
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
struct ct_pcpu *pcpu;
if (!cpu_possible(cpu))
continue;
pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
spin_lock_bh(&pcpu->lock);
list = dying ? &pcpu->dying : &pcpu->unconfirmed;
restart:
hlist_nulls_for_each_entry(h, n, list, hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (l3proto && nf_ct_l3num(ct) != l3proto)
continue;
if (cb->args[1]) {
if (ct != last)
continue;
cb->args[1] = 0;
}
rcu_read_lock();
res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
ct);
rcu_read_unlock();
if (res < 0) {
if (!atomic_inc_not_zero(&ct->ct_general.use))
continue;
cb->args[0] = cpu;
cb->args[1] = (unsigned long)ct;
spin_unlock_bh(&pcpu->lock);
goto out;
}
}
if (cb->args[1]) {
cb->args[1] = 0;
goto restart;
}
spin_unlock_bh(&pcpu->lock);
}
cb->args[2] = 1;
out:
if (last)
nf_ct_put(last);
return skb->len;
}
static int
ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
{
return ctnetlink_dump_list(skb, cb, true);
}
static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ctnetlink_dump_dying,
.done = ctnetlink_done_list,
};
return netlink_dump_start(ctnl, skb, nlh, &c);
}
return -EOPNOTSUPP;
}
static int
ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
{
return ctnetlink_dump_list(skb, cb, false);
}
static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ctnetlink_dump_unconfirmed,
.done = ctnetlink_done_list,
};
return netlink_dump_start(ctnl, skb, nlh, &c);
}
return -EOPNOTSUPP;
}
#ifdef CONFIG_NF_NAT_NEEDED
static int
ctnetlink_parse_nat_setup(struct nf_conn *ct,
enum nf_nat_manip_type manip,
const struct nlattr *attr)
{
struct nf_nat_hook *nat_hook;
int err;
nat_hook = rcu_dereference(nf_nat_hook);
if (!nat_hook) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
if (request_module("nf-nat") < 0) {
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
return -EOPNOTSUPP;
}
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
nat_hook = rcu_dereference(nf_nat_hook);
if (nat_hook)
return -EAGAIN;
#endif
return -EOPNOTSUPP;
}
err = nat_hook->parse_nat_setup(ct, manip, attr);
if (err == -EAGAIN) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
return -EOPNOTSUPP;
}
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
#else
err = -EOPNOTSUPP;
#endif
}
return err;
}
#endif
static void
__ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
unsigned long off)
{
unsigned int bit;
/* Ignore these unchangable bits */
on &= ~IPS_UNCHANGEABLE_MASK;
off &= ~IPS_UNCHANGEABLE_MASK;
for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
if (on & (1 << bit))
set_bit(bit, &ct->status);
else if (off & (1 << bit))
clear_bit(bit, &ct->status);
}
}
static int
ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
{
unsigned long d;
unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
d = ct->status ^ status;
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
/* unchangeable */
return -EBUSY;
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
/* SEEN_REPLY bit can only be set */
return -EBUSY;
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
/* ASSURED bit can only be set */
return -EBUSY;
__ctnetlink_change_status(ct, status, 0);
return 0;
}
static int
ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
{
#ifdef CONFIG_NF_NAT_NEEDED
int ret;
if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
return 0;
ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
cda[CTA_NAT_DST]);
if (ret < 0)
return ret;
return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
cda[CTA_NAT_SRC]);
#else
if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
return 0;
return -EOPNOTSUPP;
#endif
}
static int ctnetlink_change_helper(struct nf_conn *ct,
const struct nlattr * const cda[])
{
struct nf_conntrack_helper *helper;
struct nf_conn_help *help = nfct_help(ct);
char *helpname = NULL;
struct nlattr *helpinfo = NULL;
int err;
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
if (err < 0)
return err;
/* don't change helper of sibling connections */
if (ct->master) {
/* If we try to change the helper to the same thing twice,
* treat the second attempt as a no-op instead of returning
* an error.
*/
err = -EBUSY;
if (help) {
rcu_read_lock();
helper = rcu_dereference(help->helper);
if (helper && !strcmp(helper->name, helpname))
err = 0;
rcu_read_unlock();
}
return err;
}
if (!strcmp(helpname, "")) {
if (help && help->helper) {
/* we had a helper before ... */
nf_ct_remove_expectations(ct);
RCU_INIT_POINTER(help->helper, NULL);
}
return 0;
}
rcu_read_lock();
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper == NULL) {
rcu_read_unlock();
return -EOPNOTSUPP;
}
if (help) {
if (help->helper == helper) {
/* update private helper data if allowed. */
if (helper->from_nlattr)
helper->from_nlattr(helpinfo, ct);
err = 0;
} else
err = -EBUSY;
} else {
/* we cannot set a helper for an existing conntrack */
err = -EOPNOTSUPP;
}
rcu_read_unlock();
return err;
}
static int ctnetlink_change_timeout(struct nf_conn *ct,
const struct nlattr * const cda[])
{
u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
if (timeout > INT_MAX)
timeout = INT_MAX;
ct->timeout = nfct_time_stamp + (u32)timeout;
if (test_bit(IPS_DYING_BIT, &ct->status))
return -ETIME;
return 0;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
static void ctnetlink_change_mark(struct nf_conn *ct,
const struct nlattr * const cda[])
{
u32 mark, newmark, mask = 0;
if (cda[CTA_MARK_MASK])
mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
mark = ntohl(nla_get_be32(cda[CTA_MARK]));
newmark = (ct->mark & mask) ^ mark;
if (newmark != ct->mark)
ct->mark = newmark;
}
#endif
static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
[CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
[CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
[CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
};
static int ctnetlink_change_protoinfo(struct nf_conn *ct,
const struct nlattr * const cda[])
{
const struct nlattr *attr = cda[CTA_PROTOINFO];
const struct nf_conntrack_l4proto *l4proto;
struct nlattr *tb[CTA_PROTOINFO_MAX+1];
int err = 0;
err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy,
NULL);
if (err < 0)
return err;
rcu_read_lock();
l4proto = __nf_ct_l4proto_find(nf_ct_protonum(ct));
if (l4proto->from_nlattr)
err = l4proto->from_nlattr(tb, ct);
rcu_read_unlock();
return err;
}
static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
[CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
[CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
[CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
};
static int change_seq_adj(struct nf_ct_seqadj *seq,
const struct nlattr * const attr)
{
int err;
struct nlattr *cda[CTA_SEQADJ_MAX+1];
err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy, NULL);
if (err < 0)
return err;
if (!cda[CTA_SEQADJ_CORRECTION_POS])
return -EINVAL;
seq->correction_pos =
ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
return -EINVAL;
seq->offset_before =
ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
if (!cda[CTA_SEQADJ_OFFSET_AFTER])
return -EINVAL;
seq->offset_after =
ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
return 0;
}
static int
ctnetlink_change_seq_adj(struct nf_conn *ct,
const struct nlattr * const cda[])
{
struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
int ret = 0;
if (!seqadj)
return 0;
spin_lock_bh(&ct->lock);
if (cda[CTA_SEQ_ADJ_ORIG]) {
ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
cda[CTA_SEQ_ADJ_ORIG]);
if (ret < 0)
goto err;
set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
}
if (cda[CTA_SEQ_ADJ_REPLY]) {
ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
cda[CTA_SEQ_ADJ_REPLY]);
if (ret < 0)
goto err;
set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
}
spin_unlock_bh(&ct->lock);
return 0;
err:
spin_unlock_bh(&ct->lock);
return ret;
}
static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
[CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
[CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
[CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
};
static int ctnetlink_change_synproxy(struct nf_conn *ct,
const struct nlattr * const cda[])
{
struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
int err;
if (!synproxy)
return 0;
err = nla_parse_nested(tb, CTA_SYNPROXY_MAX, cda[CTA_SYNPROXY],
synproxy_policy, NULL);
if (err < 0)
return err;
if (!tb[CTA_SYNPROXY_ISN] ||
!tb[CTA_SYNPROXY_ITS] ||
!tb[CTA_SYNPROXY_TSOFF])
return -EINVAL;
synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
return 0;
}
static int
ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
{
#ifdef CONFIG_NF_CONNTRACK_LABELS
size_t len = nla_len(cda[CTA_LABELS]);
const void *mask = cda[CTA_LABELS_MASK];
if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
return -EINVAL;
if (mask) {
if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
nla_len(cda[CTA_LABELS_MASK]) != len)
return -EINVAL;
mask = nla_data(cda[CTA_LABELS_MASK]);
}
len /= sizeof(u32);
return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
#else
return -EOPNOTSUPP;
#endif
}
static int
ctnetlink_change_conntrack(struct nf_conn *ct,
const struct nlattr * const cda[])
{
int err;
/* only allow NAT changes and master assignation for new conntracks */
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
return -EOPNOTSUPP;
if (cda[CTA_HELP]) {
err = ctnetlink_change_helper(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_TIMEOUT]) {
err = ctnetlink_change_timeout(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_STATUS]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_PROTOINFO]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
return err;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK])
ctnetlink_change_mark(ct, cda);
#endif
if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
err = ctnetlink_change_seq_adj(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_SYNPROXY]) {
err = ctnetlink_change_synproxy(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_LABELS]) {
err = ctnetlink_attach_labels(ct, cda);
if (err < 0)
return err;
}
return 0;
}
static struct nf_conn *
ctnetlink_create_conntrack(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nlattr * const cda[],
struct nf_conntrack_tuple *otuple,
struct nf_conntrack_tuple *rtuple,
u8 u3)
{
struct nf_conn *ct;
int err = -EINVAL;
struct nf_conntrack_helper *helper;
struct nf_conn_tstamp *tstamp;
u64 timeout;
ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
if (IS_ERR(ct))
return ERR_PTR(-ENOMEM);
if (!cda[CTA_TIMEOUT])
goto err1;
timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
if (timeout > INT_MAX)
timeout = INT_MAX;
ct->timeout = (u32)timeout + nfct_time_stamp;
rcu_read_lock();
if (cda[CTA_HELP]) {
char *helpname = NULL;
struct nlattr *helpinfo = NULL;
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
if (err < 0)
goto err2;
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper == NULL) {
rcu_read_unlock();
#ifdef CONFIG_MODULES
if (request_module("nfct-helper-%s", helpname) < 0) {
err = -EOPNOTSUPP;
goto err1;
}
rcu_read_lock();
helper = __nf_conntrack_helper_find(helpname,
nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper) {
err = -EAGAIN;
goto err2;
}
rcu_read_unlock();
#endif
err = -EOPNOTSUPP;
goto err1;
} else {
struct nf_conn_help *help;
help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
if (help == NULL) {
err = -ENOMEM;
goto err2;
}
/* set private helper data if allowed. */
if (helper->from_nlattr)
helper->from_nlattr(helpinfo, ct);
/* not in hash table yet so not strictly necessary */
RCU_INIT_POINTER(help->helper, helper);
}
} else {
/* try an implicit helper assignation */
err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
if (err < 0)
goto err2;
}
err = ctnetlink_setup_nat(ct, cda);
if (err < 0)
goto err2;
nf_ct_acct_ext_add(ct, GFP_ATOMIC);
nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
nf_ct_labels_ext_add(ct);
nfct_seqadj_ext_add(ct);
nfct_synproxy_ext_add(ct);
/* we must add conntrack extensions before confirmation. */
ct->status |= IPS_CONFIRMED;
if (cda[CTA_STATUS]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
goto err2;
}
if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
err = ctnetlink_change_seq_adj(ct, cda);
if (err < 0)
goto err2;
}
memset(&ct->proto, 0, sizeof(ct->proto));
if (cda[CTA_PROTOINFO]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
goto err2;
}
if (cda[CTA_SYNPROXY]) {
err = ctnetlink_change_synproxy(ct, cda);
if (err < 0)
goto err2;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK])
ctnetlink_change_mark(ct, cda);
#endif
/* setup master conntrack: this is a confirmed expectation */
if (cda[CTA_TUPLE_MASTER]) {
struct nf_conntrack_tuple master;
struct nf_conntrack_tuple_hash *master_h;
struct nf_conn *master_ct;
err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
u3, NULL);
if (err < 0)
goto err2;
master_h = nf_conntrack_find_get(net, zone, &master);
if (master_h == NULL) {
err = -ENOENT;
goto err2;
}
master_ct = nf_ct_tuplehash_to_ctrack(master_h);
__set_bit(IPS_EXPECTED_BIT, &ct->status);
ct->master = master_ct;
}
tstamp = nf_conn_tstamp_find(ct);
if (tstamp)
tstamp->start = ktime_get_real_ns();
err = nf_conntrack_hash_check_insert(ct);
if (err < 0)
goto err2;
rcu_read_unlock();
return ct;
err2:
rcu_read_unlock();
err1:
nf_conntrack_free(ct);
return ERR_PTR(err);
}
static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
struct nf_conntrack_tuple otuple, rtuple;
struct nf_conntrack_tuple_hash *h = NULL;
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
struct nf_conn *ct;
u_int8_t u3 = nfmsg->nfgen_family;
struct nf_conntrack_zone 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, &otuple, CTA_TUPLE_ORIG,
u3, &zone);
if (err < 0)
return err;
}
if (cda[CTA_TUPLE_REPLY]) {
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
u3, &zone);
if (err < 0)
return err;
}
if (cda[CTA_TUPLE_ORIG])
h = nf_conntrack_find_get(net, &zone, &otuple);
else if (cda[CTA_TUPLE_REPLY])
h = nf_conntrack_find_get(net, &zone, &rtuple);
if (h == NULL) {
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE) {
enum ip_conntrack_events events;
if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
return -EINVAL;
if (otuple.dst.protonum != rtuple.dst.protonum)
return -EINVAL;
ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
&rtuple, u3);
if (IS_ERR(ct))
return PTR_ERR(ct);
err = 0;
if (test_bit(IPS_EXPECTED_BIT, &ct->status))
events = 1 << IPCT_RELATED;
else
events = 1 << IPCT_NEW;
if (cda[CTA_LABELS] &&
ctnetlink_attach_labels(ct, cda) == 0)
events |= (1 << IPCT_LABEL);
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
(1 << IPCT_ASSURED) |
(1 << IPCT_HELPER) |
(1 << IPCT_PROTOINFO) |
(1 << IPCT_SEQADJ) |
(1 << IPCT_MARK) |
(1 << IPCT_SYNPROXY) |
events,
ct, NETLINK_CB(skb).portid,
nlmsg_report(nlh));
nf_ct_put(ct);
}
return err;
}
/* implicit 'else' */
err = -EEXIST;
ct = nf_ct_tuplehash_to_ctrack(h);
if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
err = ctnetlink_change_conntrack(ct, cda);
if (err == 0) {
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
(1 << IPCT_ASSURED) |
(1 << IPCT_HELPER) |
(1 << IPCT_LABEL) |
(1 << IPCT_PROTOINFO) |
(1 << IPCT_SEQADJ) |
(1 << IPCT_MARK) |
(1 << IPCT_SYNPROXY),
ct, NETLINK_CB(skb).portid,
nlmsg_report(nlh));
}
}
nf_ct_put(ct);
return err;
}
static int
ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
__u16 cpu, const struct ip_conntrack_stat *st)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
IPCTNL_MSG_CT_GET_STATS_CPU);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = AF_UNSPEC;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(cpu);
if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
htonl(st->insert_failed)) ||
nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
htonl(st->search_restart)))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
static int
ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int cpu;
struct net *net = sock_net(skb->sk);
if (cb->args[0] == nr_cpu_ids)
return 0;
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
const struct ip_conntrack_stat *st;
if (!cpu_possible(cpu))
continue;
st = per_cpu_ptr(net->ct.stat, cpu);
if (ctnetlink_ct_stat_cpu_fill_info(skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
cpu, st) < 0)
break;
}
cb->args[0] = cpu;
return skb->len;
}
static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ctnetlink_ct_stat_cpu_dump,
};
return netlink_dump_start(ctnl, skb, nlh, &c);
}
return 0;
}
static int
ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
struct net *net)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
unsigned int nr_conntracks = atomic_read(&net->ct.count);
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = AF_UNSPEC;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
goto nla_put_failure;
if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return skb->len;
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
struct sk_buff *skb, const struct nlmsghdr *nlh,
const struct nlattr * const cda[],
struct netlink_ext_ack *extack)
{
struct sk_buff *skb2;
int err;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (skb2 == NULL)
return -ENOMEM;
err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
nlh->nlmsg_seq,
NFNL_MSG_TYPE(nlh->nlmsg_type),
sock_net(skb->sk));
if (err <= 0)
goto free;
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
if (err < 0)
goto out;
return 0;
free:
kfree_skb(skb2);
out:
/* this avoids a loop in nfnetlink. */
return err == -EAGAIN ? -ENOBUFS : err;
}
static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
[CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
[CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
[CTA_EXPECT_MASK] = { .type = NLA_NESTED },
[CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
[CTA_EXPECT_ID] = { .type = NLA_U32 },
[CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
.len = NF_CT_HELPER_NAME_LEN - 1 },
[CTA_EXPECT_ZONE] = { .type = NLA_U16 },
[CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
[CTA_EXPECT_CLASS] = { .type = NLA_U32 },
[CTA_EXPECT_NAT] = { .type = NLA_NESTED },
[CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
};
static struct nf_conntrack_expect *
ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
struct nf_conntrack_helper *helper,
struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *mask);
#ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
static size_t
ctnetlink_glue_build_size(const struct nf_conn *ct)
{
return 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 */
+ 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
#ifdef CONFIG_NF_CONNTRACK_ZONES
+ nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
#endif
+ ctnetlink_proto_size(ct)
;
}
static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
enum ip_conntrack_info *ctinfo)
{
return nf_ct_get(skb, ctinfo);
}
static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
{
const struct nf_conntrack_zone *zone;
struct nlattr *nest_parms;
zone = nf_ct_zone(ct);
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;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_ORIG) < 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;
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
NF_CT_ZONE_DIR_REPL) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
NF_CT_DEFAULT_ZONE_DIR) < 0)
goto nla_put_failure;
if (ctnetlink_dump_id(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_status(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_timeout(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_protoinfo(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_helpinfo(skb, ct) < 0)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_SECMARK
if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
goto nla_put_failure;
#endif
if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
goto nla_put_failure;
if ((ct->status & IPS_SEQ_ADJUST) &&
ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
goto nla_put_failure;
if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_MARK
if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
goto nla_put_failure;
#endif
if (ctnetlink_dump_labels(skb, ct) < 0)
goto nla_put_failure;
return 0;
nla_put_failure:
return -ENOSPC;
}
static int
ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
u_int16_t ct_attr, u_int16_t ct_info_attr)
{
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (__ctnetlink_glue_build(skb, ct) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -ENOSPC;
}
static int
ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
{
unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
unsigned long d = ct->status ^ status;
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
/* SEEN_REPLY bit can only be set */
return -EBUSY;
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
/* ASSURED bit can only be set */
return -EBUSY;
/* This check is less strict than ctnetlink_change_status()
* because callers often flip IPS_EXPECTED bits when sending
* an NFQA_CT attribute to the kernel. So ignore the
* unchangeable bits but do not error out. Also user programs
* are allowed to clear the bits that they are allowed to change.
*/
__ctnetlink_change_status(ct, status, ~status);
return 0;
}
static int
ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
{
int err;
if (cda[CTA_TIMEOUT]) {
err = ctnetlink_change_timeout(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_STATUS]) {
err = ctnetlink_update_status(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_HELP]) {
err = ctnetlink_change_helper(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_LABELS]) {
err = ctnetlink_attach_labels(ct, cda);
if (err < 0)
return err;
}
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK]) {
ctnetlink_change_mark(ct, cda);
}
#endif
return 0;
}
static int
ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
{
struct nlattr *cda[CTA_MAX+1];
int ret;
ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy, NULL);
if (ret < 0)
return ret;
return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
}
static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
const struct nf_conn *ct,
struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *mask)
{
int err;
err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
nf_ct_l3num(ct), NULL);
if (err < 0)
return err;
return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
nf_ct_l3num(ct), NULL);
}
static int
ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
u32 portid, u32 report)
{
struct nlattr *cda[CTA_EXPECT_MAX+1];
struct nf_conntrack_tuple tuple, mask;
struct nf_conntrack_helper *helper = NULL;
struct nf_conntrack_expect *exp;
int err;
err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy,
NULL);
if (err < 0)
return err;
err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
ct, &tuple, &mask);
if (err < 0)
return err;
if (cda[CTA_EXPECT_HELP_NAME]) {
const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper == NULL)
return -EOPNOTSUPP;
}
exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
helper, &tuple, &mask);
if (IS_ERR(exp))
return PTR_ERR(exp);
err = nf_ct_expect_related_report(exp, portid, report);
nf_ct_expect_put(exp);
return err;
}
static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo, int diff)
{
if (!(ct->status & IPS_NAT_MASK))
return;
nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
}
static struct nfnl_ct_hook ctnetlink_glue_hook = {
.get_ct = ctnetlink_glue_get_ct,
.build_size = ctnetlink_glue_build_size,
.build = ctnetlink_glue_build,
.parse = ctnetlink_glue_parse,
.attach_expect = ctnetlink_glue_attach_expect,
.seq_adjust = ctnetlink_glue_seqadj,
};
#endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
/***********************************************************************
* EXPECT
***********************************************************************/
static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,
u32 type)
{
struct nlattr *nest_parms;
nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (ctnetlink_dump_tuples(skb, tuple) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
return -1;
}
static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple,