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netfilter: nf_ct_tcp: add namespace support

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This patch adds namespace support for TCP protocol tracker.

Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Gao feng 2012-05-28 21:04:12 +00:00 committed by Pablo Neira Ayuso
parent 15f585bd76
commit d2ba1fde42
3 changed files with 145 additions and 29 deletions
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10
include/net/netns/conntrack.h
View File

@ -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;

2
net/netfilter/nf_conntrack_proto.c
View File

@ -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:

162
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -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);