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ping: move ping_group_range out of CONFIG_SYSCTL

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Similarly, when CONFIG_SYSCTL is not set, ping_group_range should still
work, just that no one can change it. Therefore we should move it out of
sysctl_net_ipv4.c. And, it should not share the same seqlock with
ip_local_port_range.

BTW, rename it to ->ping_group_range instead.

Cc: David S. Miller <davem@davemloft.net>
Cc: Francois Romieu <romieu@fr.zoreil.com>
Reported-by: Stefan de Konink <stefan@konink.de>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2014-05-06 11:02:50 -07:00 committed by David S. Miller
parent c9d8f1a642
commit ba6b918ab2
4 changed files with 20 additions and 14 deletions
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7
include/net/netns/ipv4.h
View File

@ -20,6 +20,11 @@ struct local_ports {
int range[2];
};
struct ping_group_range {
seqlock_t lock;
kgid_t range[2];
};
struct netns_ipv4 {
#ifdef CONFIG_SYSCTL
struct ctl_table_header *forw_hdr;
@ -72,7 +77,7 @@ struct netns_ipv4 {
int sysctl_ip_no_pmtu_disc;
int sysctl_ip_fwd_use_pmtu;
kgid_t sysctl_ping_group_range[2];
struct ping_group_range ping_group_range;
atomic_t dev_addr_genid;

8
net/ipv4/af_inet.c
View File

@ -1658,6 +1658,14 @@ static __net_init int inet_init_net(struct net *net)
seqlock_init(&net->ipv4.ip_local_ports.lock);
net->ipv4.ip_local_ports.range[0] = 32768;
net->ipv4.ip_local_ports.range[1] = 61000;
seqlock_init(&net->ipv4.ping_group_range.lock);
/*
* Sane defaults - nobody may create ping sockets.
* Boot scripts should set this to distro-specific group.
*/
net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
return 0;
}

6
net/ipv4/ping.c
View File

@ -236,15 +236,15 @@ exit:
static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
kgid_t *high)
{
kgid_t *data = net->ipv4.sysctl_ping_group_range;
kgid_t *data = net->ipv4.ping_group_range.range;
unsigned int seq;
do {
seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
*low = data[0];
*high = data[1];
} while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
} while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
}

13
net/ipv4/sysctl_net_ipv4.c
View File

@ -87,7 +87,7 @@ static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low
{
kgid_t *data = table->data;
struct net *net =
container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
container_of(table->data, struct net, ipv4.ping_group_range.range);
unsigned int seq;
do {
seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
@ -102,7 +102,7 @@ static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t hig
{
kgid_t *data = table->data;
struct net *net =
container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
container_of(table->data, struct net, ipv4.ping_group_range.range);
write_seqlock(&net->ipv4.ip_local_ports.lock);
data[0] = low;
data[1] = high;
@ -805,7 +805,7 @@ static struct ctl_table ipv4_net_table[] = {
},
{
.procname = "ping_group_range",
.data = &init_net.ipv4.sysctl_ping_group_range,
.data = &init_net.ipv4.ping_group_range.range,
.maxlen = sizeof(gid_t)*2,
.mode = 0644,
.proc_handler = ipv4_ping_group_range,
@ -858,13 +858,6 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
table[i].data += (void *)net - (void *)&init_net;
}
/*
* Sane defaults - nobody may create ping sockets.
* Boot scripts should set this to distro-specific group.
*/
net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
if (net->ipv4.ipv4_hdr == NULL)
goto err_reg;