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Message-Id: <1339425841-24171-8-git-send-email-pablo@netfilter.org>
Date: Mon, 11 Jun 2012 16:43:43 +0200
From: pablo@...filter.org
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 07/25] netfilter: nf_ct_tcp: add namespace support
From: Gao feng <gaofeng@...fujitsu.com>
This patch adds namespace support for TCP protocol tracker.
Acked-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netns/conntrack.h | 10 ++
net/netfilter/nf_conntrack_proto.c | 2 +
net/netfilter/nf_conntrack_proto_tcp.c | 162 ++++++++++++++++++++++++++------
3 files changed, 145 insertions(+), 29 deletions(-)
diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
index 0ef8592..680d799 100644
--- a/include/net/netns/conntrack.h
+++ b/include/net/netns/conntrack.h
@@ -4,6 +4,7 @@
#include <linux/list.h>
#include <linux/list_nulls.h>
#include <linux/atomic.h>
+#include <linux/netfilter/nf_conntrack_tcp.h>
struct ctl_table_header;
struct nf_conntrack_ecache;
@@ -25,8 +26,17 @@ struct nf_generic_net {
unsigned int timeout;
};
+struct nf_tcp_net {
+ struct nf_proto_net pn;
+ unsigned int timeouts[TCP_CONNTRACK_TIMEOUT_MAX];
+ unsigned int tcp_loose;
+ unsigned int tcp_be_liberal;
+ unsigned int tcp_max_retrans;
+};
+
struct nf_ip_net {
struct nf_generic_net generic;
+ struct nf_tcp_net tcp;
#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
struct ctl_table_header *ctl_table_header;
struct ctl_table *ctl_table;
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index b095b4a..8a71e8b 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -303,6 +303,8 @@ static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
struct nf_conntrack_l4proto *l4proto)
{
switch (l4proto->l4proto) {
+ case IPPROTO_TCP:
+ return (struct nf_proto_net *)&net->ct.nf_ct_proto.tcp;
case 255: /* l4proto_generic */
return (struct nf_proto_net *)&net->ct.nf_ct_proto.generic;
default:
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 21ff1a9..a053f67 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -270,6 +270,11 @@ static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = {
}
};
+static inline struct nf_tcp_net *tcp_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.tcp;
+}
+
static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
struct nf_conntrack_tuple *tuple)
{
@@ -516,6 +521,7 @@ static bool tcp_in_window(const struct nf_conn *ct,
u_int8_t pf)
{
struct net *net = nf_ct_net(ct);
+ struct nf_tcp_net *tn = tcp_pernet(net);
struct ip_ct_tcp_state *sender = &state->seen[dir];
struct ip_ct_tcp_state *receiver = &state->seen[!dir];
const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
@@ -720,7 +726,7 @@ static bool tcp_in_window(const struct nf_conn *ct,
} else {
res = false;
if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL ||
- nf_ct_tcp_be_liberal)
+ tn->tcp_be_liberal)
res = true;
if (!res && LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
@@ -828,6 +834,7 @@ static int tcp_packet(struct nf_conn *ct,
unsigned int *timeouts)
{
struct net *net = nf_ct_net(ct);
+ struct nf_tcp_net *tn = tcp_pernet(net);
struct nf_conntrack_tuple *tuple;
enum tcp_conntrack new_state, old_state;
enum ip_conntrack_dir dir;
@@ -1020,7 +1027,7 @@ static int tcp_packet(struct nf_conn *ct,
&& new_state == TCP_CONNTRACK_FIN_WAIT)
ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT;
- if (ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans &&
+ if (ct->proto.tcp.retrans >= tn->tcp_max_retrans &&
timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS])
timeout = timeouts[TCP_CONNTRACK_RETRANS];
else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) &
@@ -1065,6 +1072,8 @@ static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
enum tcp_conntrack new_state;
const struct tcphdr *th;
struct tcphdr _tcph;
+ struct net *net = nf_ct_net(ct);
+ struct nf_tcp_net *tn = tcp_pernet(net);
const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0];
const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1];
@@ -1093,7 +1102,7 @@ static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
ct->proto.tcp.seen[0].td_end;
tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]);
- } else if (nf_ct_tcp_loose == 0) {
+ } else if (tn->tcp_loose == 0) {
/* Don't try to pick up connections. */
return false;
} else {
@@ -1360,91 +1369,78 @@ static struct ctl_table_header *tcp_sysctl_header;
static struct ctl_table tcp_sysctl_table[] = {
{
.procname = "nf_conntrack_tcp_timeout_syn_sent",
- .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_syn_recv",
- .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_established",
- .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_fin_wait",
- .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_close_wait",
- .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_last_ack",
- .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_time_wait",
- .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_close",
- .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_max_retrans",
- .data = &tcp_timeouts[TCP_CONNTRACK_RETRANS],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_unacknowledged",
- .data = &tcp_timeouts[TCP_CONNTRACK_UNACK],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_loose",
- .data = &nf_ct_tcp_loose,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "nf_conntrack_tcp_be_liberal",
- .data = &nf_ct_tcp_be_liberal,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "nf_conntrack_tcp_max_retrans",
- .data = &nf_ct_tcp_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
@@ -1456,91 +1452,78 @@ static struct ctl_table tcp_sysctl_table[] = {
static struct ctl_table tcp_compat_sysctl_table[] = {
{
.procname = "ip_conntrack_tcp_timeout_syn_sent",
- .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_syn_sent2",
- .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT2],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_syn_recv",
- .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_established",
- .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_fin_wait",
- .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_close_wait",
- .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_last_ack",
- .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_time_wait",
- .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_close",
- .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_max_retrans",
- .data = &tcp_timeouts[TCP_CONNTRACK_RETRANS],
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_loose",
- .data = &nf_ct_tcp_loose,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "ip_conntrack_tcp_be_liberal",
- .data = &nf_ct_tcp_be_liberal,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "ip_conntrack_tcp_max_retrans",
- .data = &nf_ct_tcp_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
@@ -1550,6 +1533,125 @@ static struct ctl_table tcp_compat_sysctl_table[] = {
#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
#endif /* CONFIG_SYSCTL */
+static int tcp_kmemdup_sysctl_table(struct nf_proto_net *pn)
+{
+#ifdef CONFIG_SYSCTL
+ struct nf_tcp_net *tn = (struct nf_tcp_net *)pn;
+
+ if (pn->ctl_table)
+ return 0;
+
+ pn->ctl_table = kmemdup(tcp_sysctl_table,
+ sizeof(tcp_sysctl_table),
+ GFP_KERNEL);
+ if (!pn->ctl_table)
+ return -ENOMEM;
+
+ pn->ctl_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
+ pn->ctl_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
+ pn->ctl_table[2].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
+ pn->ctl_table[3].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
+ pn->ctl_table[4].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
+ pn->ctl_table[5].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
+ pn->ctl_table[6].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
+ pn->ctl_table[7].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
+ pn->ctl_table[8].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
+ pn->ctl_table[9].data = &tn->timeouts[TCP_CONNTRACK_UNACK];
+ pn->ctl_table[10].data = &tn->tcp_loose;
+ pn->ctl_table[11].data = &tn->tcp_be_liberal;
+ pn->ctl_table[12].data = &tn->tcp_max_retrans;
+#endif
+ return 0;
+}
+
+static int tcp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn)
+{
+#ifdef CONFIG_SYSCTL
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+ struct nf_tcp_net *tn = (struct nf_tcp_net *)pn;
+ pn->ctl_compat_table = kmemdup(tcp_compat_sysctl_table,
+ sizeof(tcp_compat_sysctl_table),
+ GFP_KERNEL);
+ if (!pn->ctl_compat_table)
+ return -ENOMEM;
+
+ pn->ctl_compat_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
+ pn->ctl_compat_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT2];
+ pn->ctl_compat_table[2].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
+ pn->ctl_compat_table[3].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
+ pn->ctl_compat_table[4].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
+ pn->ctl_compat_table[5].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
+ pn->ctl_compat_table[6].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
+ pn->ctl_compat_table[7].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
+ pn->ctl_compat_table[8].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
+ pn->ctl_compat_table[9].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
+ pn->ctl_compat_table[10].data = &tn->tcp_loose;
+ pn->ctl_compat_table[11].data = &tn->tcp_be_liberal;
+ pn->ctl_compat_table[12].data = &tn->tcp_max_retrans;
+#endif
+#endif
+ return 0;
+}
+
+static int tcpv4_init_net(struct net *net)
+{
+ int i;
+ int ret = 0;
+ struct nf_tcp_net *tn = tcp_pernet(net);
+ struct nf_proto_net *pn = (struct nf_proto_net *)tn;
+
+#ifdef CONFIG_SYSCTL
+ if (!pn->ctl_table) {
+#else
+ if (!pn->user++) {
+#endif
+ for (i = 0; i < TCP_CONNTRACK_TIMEOUT_MAX; i++)
+ tn->timeouts[i] = tcp_timeouts[i];
+
+ tn->tcp_loose = nf_ct_tcp_loose;
+ tn->tcp_be_liberal = nf_ct_tcp_be_liberal;
+ tn->tcp_max_retrans = nf_ct_tcp_max_retrans;
+ }
+
+ ret = tcp_kmemdup_compat_sysctl_table(pn);
+
+ if (ret < 0)
+ return ret;
+
+ ret = tcp_kmemdup_sysctl_table(pn);
+
+#ifdef CONFIG_SYSCTL
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+ if (ret < 0) {
+ kfree(pn->ctl_compat_table);
+ pn->ctl_compat_table = NULL;
+ }
+#endif
+#endif
+ return ret;
+}
+
+static int tcpv6_init_net(struct net *net)
+{
+ int i;
+ struct nf_tcp_net *tn = tcp_pernet(net);
+ struct nf_proto_net *pn = (struct nf_proto_net *)tn;
+
+#ifdef CONFIG_SYSCTL
+ if (!pn->ctl_table) {
+#else
+ if (!pn->user++) {
+#endif
+ for (i = 0; i < TCP_CONNTRACK_TIMEOUT_MAX; i++)
+ tn->timeouts[i] = tcp_timeouts[i];
+ tn->tcp_loose = nf_ct_tcp_loose;
+ tn->tcp_be_liberal = nf_ct_tcp_be_liberal;
+ tn->tcp_max_retrans = nf_ct_tcp_max_retrans;
+ }
+
+ return tcp_kmemdup_sysctl_table(pn);
+}
+
struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly =
{
.l3proto = PF_INET,
@@ -1590,6 +1692,7 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly =
.ctl_compat_table = tcp_compat_sysctl_table,
#endif
#endif
+ .init_net = tcpv4_init_net,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4);
@@ -1630,5 +1733,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly =
.ctl_table_header = &tcp_sysctl_header,
.ctl_table = tcp_sysctl_table,
#endif
+ .init_net = tcpv6_init_net,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6);
--
1.7.10
--
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