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netfilter: ctnetlink: add zone support
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Parse and dump the conntrack zone in ctnetlink.

Signed-off-by: Patrick McHardy <kaber@trash.net>
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Patrick McHardy committed Feb 15, 2010
1 parent 5d0aa2c commit ef00f89
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Showing 2 changed files with 75 additions and 19 deletions.
2 changes: 2 additions & 0 deletions include/linux/netfilter/nfnetlink_conntrack.h
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@ enum ctattr_type {
CTA_NAT_SEQ_ADJ_ORIG,
CTA_NAT_SEQ_ADJ_REPLY,
CTA_SECMARK,
CTA_ZONE,
__CTA_MAX
};
#define CTA_MAX (__CTA_MAX - 1)
Expand Down Expand Up @@ -159,6 +160,7 @@ enum ctattr_expect {
CTA_EXPECT_TIMEOUT,
CTA_EXPECT_ID,
CTA_EXPECT_HELP_NAME,
CTA_EXPECT_ZONE,
__CTA_EXPECT_MAX
};
#define CTA_EXPECT_MAX (__CTA_EXPECT_MAX - 1)
Expand Down
92 changes: 73 additions & 19 deletions net/netfilter/nf_conntrack_netlink.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@
#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>
#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_protocol.h>
Expand Down Expand Up @@ -379,6 +380,9 @@ ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
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) < 0 ||
Expand Down Expand Up @@ -517,6 +521,9 @@ ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
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;

Expand Down Expand Up @@ -750,6 +757,21 @@ ctnetlink_parse_tuple(const struct nlattr * const cda[],
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 },
};
Expand Down Expand Up @@ -781,6 +803,7 @@ static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
[CTA_ID] = { .type = NLA_U32 },
[CTA_NAT_DST] = { .type = NLA_NESTED },
[CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
[CTA_ZONE] = { .type = NLA_U16 },
};

static int
Expand All @@ -794,7 +817,12 @@ ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nf_conn *ct;
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
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);
Expand All @@ -811,7 +839,7 @@ ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
if (err < 0)
return err;

h = nf_conntrack_find_get(net, 0, &tuple);
h = nf_conntrack_find_get(net, zone, &tuple);
if (!h)
return -ENOENT;

Expand Down Expand Up @@ -856,12 +884,17 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct sk_buff *skb2 = NULL;
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
u16 zone;
int err;

if (nlh->nlmsg_flags & NLM_F_DUMP)
return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
ctnetlink_done);

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])
Expand All @@ -872,7 +905,7 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
if (err < 0)
return err;

h = nf_conntrack_find_get(net, 0, &tuple);
h = nf_conntrack_find_get(net, zone, &tuple);
if (!h)
return -ENOENT;

Expand Down Expand Up @@ -1211,7 +1244,7 @@ ctnetlink_change_conntrack(struct nf_conn *ct,
}

static struct nf_conn *
ctnetlink_create_conntrack(struct net *net,
ctnetlink_create_conntrack(struct net *net, u16 zone,
const struct nlattr * const cda[],
struct nf_conntrack_tuple *otuple,
struct nf_conntrack_tuple *rtuple,
Expand All @@ -1221,7 +1254,7 @@ ctnetlink_create_conntrack(struct net *net,
int err = -EINVAL;
struct nf_conntrack_helper *helper;

ct = nf_conntrack_alloc(net, 0, otuple, rtuple, GFP_ATOMIC);
ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
if (IS_ERR(ct))
return ERR_PTR(-ENOMEM);

Expand Down Expand Up @@ -1325,7 +1358,7 @@ ctnetlink_create_conntrack(struct net *net,
if (err < 0)
goto err2;

master_h = nf_conntrack_find_get(net, 0, &master);
master_h = nf_conntrack_find_get(net, zone, &master);
if (master_h == NULL) {
err = -ENOENT;
goto err2;
Expand Down Expand Up @@ -1358,7 +1391,12 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nf_conntrack_tuple_hash *h = NULL;
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
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, &otuple, CTA_TUPLE_ORIG, u3);
Expand All @@ -1374,17 +1412,17 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,

spin_lock_bh(&nf_conntrack_lock);
if (cda[CTA_TUPLE_ORIG])
h = __nf_conntrack_find(net, 0, &otuple);
h = __nf_conntrack_find(net, zone, &otuple);
else if (cda[CTA_TUPLE_REPLY])
h = __nf_conntrack_find(net, 0, &rtuple);
h = __nf_conntrack_find(net, zone, &rtuple);

if (h == NULL) {
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE) {
struct nf_conn *ct;
enum ip_conntrack_events events;

ct = ctnetlink_create_conntrack(net, cda, &otuple,
ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
&rtuple, u3);
if (IS_ERR(ct)) {
err = PTR_ERR(ct);
Expand Down Expand Up @@ -1698,14 +1736,19 @@ ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
struct sk_buff *skb2;
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
u16 zone;
int err;

if (nlh->nlmsg_flags & NLM_F_DUMP) {
return netlink_dump_start(ctnl, skb, nlh,
ctnetlink_exp_dump_table,
ctnetlink_exp_done);
}

err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
if (err < 0)
return err;

if (cda[CTA_EXPECT_MASTER])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
else
Expand All @@ -1714,7 +1757,7 @@ ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
if (err < 0)
return err;

exp = nf_ct_expect_find_get(net, 0, &tuple);
exp = nf_ct_expect_find_get(net, zone, &tuple);
if (!exp)
return -ENOENT;

Expand Down Expand Up @@ -1761,16 +1804,21 @@ ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
struct hlist_node *n, *next;
u_int8_t u3 = nfmsg->nfgen_family;
unsigned int i;
u16 zone;
int err;

if (cda[CTA_EXPECT_TUPLE]) {
/* delete a single expect by tuple */
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
if (err < 0)
return err;

err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;

/* bump usage count to 2 */
exp = nf_ct_expect_find_get(net, 0, &tuple);
exp = nf_ct_expect_find_get(net, zone, &tuple);
if (!exp)
return -ENOENT;

Expand Down Expand Up @@ -1832,7 +1880,8 @@ ctnetlink_change_expect(struct nf_conntrack_expect *x,
}

static int
ctnetlink_create_expect(struct net *net, const struct nlattr * const cda[],
ctnetlink_create_expect(struct net *net, u16 zone,
const struct nlattr * const cda[],
u_int8_t u3,
u32 pid, int report)
{
Expand All @@ -1855,7 +1904,7 @@ ctnetlink_create_expect(struct net *net, const struct nlattr * const cda[],
return err;

/* Look for master conntrack of this expectation */
h = nf_conntrack_find_get(net, 0, &master_tuple);
h = nf_conntrack_find_get(net, zone, &master_tuple);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
Expand Down Expand Up @@ -1900,25 +1949,30 @@ ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
struct nf_conntrack_expect *exp;
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
u16 zone;
int err;

if (!cda[CTA_EXPECT_TUPLE]
|| !cda[CTA_EXPECT_MASK]
|| !cda[CTA_EXPECT_MASTER])
return -EINVAL;

err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
if (err < 0)
return err;

err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;

spin_lock_bh(&nf_conntrack_lock);
exp = __nf_ct_expect_find(net, 0, &tuple);
exp = __nf_ct_expect_find(net, zone, &tuple);

if (!exp) {
spin_unlock_bh(&nf_conntrack_lock);
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE) {
err = ctnetlink_create_expect(net, cda,
err = ctnetlink_create_expect(net, zone, cda,
u3,
NETLINK_CB(skb).pid,
nlmsg_report(nlh));
Expand Down

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