ipv4: Namespaceify ip_default_ttl sysctl knob
Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 848fe80..bc8f7f9 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -80,6 +80,7 @@
int sysctl_tcp_ecn;
int sysctl_tcp_ecn_fallback;
+ int sysctl_ip_default_ttl;
int sysctl_ip_no_pmtu_disc;
int sysctl_ip_fwd_use_pmtu;
int sysctl_ip_nonlocal_bind;
diff --git a/include/net/route.h b/include/net/route.h
index a3b9ef7..9b0a523 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -329,14 +329,13 @@
return skb->skb_iif;
}
-extern int sysctl_ip_default_ttl;
-
static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
{
int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
+ struct net *net = dev_net(dst->dev);
if (hoplimit == 0)
- hoplimit = sysctl_ip_default_ttl;
+ hoplimit = net->ipv4.sysctl_ip_default_ttl;
return hoplimit;
}
diff --git a/net/bridge/netfilter/nft_reject_bridge.c b/net/bridge/netfilter/nft_reject_bridge.c
index fdba3d9..adc8d72 100644
--- a/net/bridge/netfilter/nft_reject_bridge.c
+++ b/net/bridge/netfilter/nft_reject_bridge.c
@@ -48,6 +48,7 @@
struct iphdr *niph;
const struct tcphdr *oth;
struct tcphdr _oth;
+ struct net *net = sock_net(oldskb->sk);
if (!nft_bridge_iphdr_validate(oldskb))
return;
@@ -63,9 +64,9 @@
skb_reserve(nskb, LL_MAX_HEADER);
niph = nf_reject_iphdr_put(nskb, oldskb, IPPROTO_TCP,
- sysctl_ip_default_ttl);
+ net->ipv4.sysctl_ip_default_ttl);
nf_reject_ip_tcphdr_put(nskb, oldskb, oth);
- niph->ttl = sysctl_ip_default_ttl;
+ niph->ttl = net->ipv4.sysctl_ip_default_ttl;
niph->tot_len = htons(nskb->len);
ip_send_check(niph);
@@ -85,6 +86,7 @@
void *payload;
__wsum csum;
u8 proto;
+ struct net *net = sock_net(oldskb->sk);
if (oldskb->csum_bad || !nft_bridge_iphdr_validate(oldskb))
return;
@@ -119,7 +121,7 @@
skb_reserve(nskb, LL_MAX_HEADER);
niph = nf_reject_iphdr_put(nskb, oldskb, IPPROTO_ICMP,
- sysctl_ip_default_ttl);
+ net->ipv4.sysctl_ip_default_ttl);
skb_reset_transport_header(nskb);
icmph = (struct icmphdr *)skb_put(nskb, sizeof(struct icmphdr));
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 64878ef..f734c42 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -79,9 +79,6 @@
#include <linux/netlink.h>
#include <linux/tcp.h>
-int sysctl_ip_default_ttl __read_mostly = IPDEFTTL;
-EXPORT_SYMBOL(sysctl_ip_default_ttl);
-
static int
ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
unsigned int mtu,
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 92808f1..3f1befc 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1341,10 +1341,13 @@
val = inet->tos;
break;
case IP_TTL:
+ {
+ struct net *net = sock_net(sk);
val = (inet->uc_ttl == -1 ?
- sysctl_ip_default_ttl :
+ net->ipv4.sysctl_ip_default_ttl :
inet->uc_ttl);
break;
+ }
case IP_HDRINCL:
val = inet->hdrincl;
break;
diff --git a/net/ipv4/netfilter/ipt_SYNPROXY.c b/net/ipv4/netfilter/ipt_SYNPROXY.c
index 5fdc556..7b8fbb35 100644
--- a/net/ipv4/netfilter/ipt_SYNPROXY.c
+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
@@ -21,6 +21,7 @@
synproxy_build_ip(struct sk_buff *skb, __be32 saddr, __be32 daddr)
{
struct iphdr *iph;
+ struct net *net = sock_net(skb->sk);
skb_reset_network_header(skb);
iph = (struct iphdr *)skb_put(skb, sizeof(*iph));
@@ -29,7 +30,7 @@
iph->tos = 0;
iph->id = 0;
iph->frag_off = htons(IP_DF);
- iph->ttl = sysctl_ip_default_ttl;
+ iph->ttl = net->ipv4.sysctl_ip_default_ttl;
iph->protocol = IPPROTO_TCP;
iph->check = 0;
iph->saddr = saddr;
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 3abd9d7..9f665b6 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -390,7 +390,7 @@
seq_printf(seq, "\nIp: %d %d",
IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
- sysctl_ip_default_ttl);
+ net->ipv4.sysctl_ip_default_ttl);
BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index b537338..a833a9f 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -283,15 +283,6 @@
.proc_handler = proc_dointvec
},
{
- .procname = "ip_default_ttl",
- .data = &sysctl_ip_default_ttl,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &ip_ttl_min,
- .extra2 = &ip_ttl_max,
- },
- {
.procname = "tcp_max_orphans",
.data = &sysctl_tcp_max_orphans,
.maxlen = sizeof(int),
@@ -753,6 +744,15 @@
.proc_handler = proc_dointvec
},
{
+ .procname = "ip_default_ttl",
+ .data = &init_net.ipv4.sysctl_ip_default_ttl,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &ip_ttl_min,
+ .extra2 = &ip_ttl_max,
+ },
+ {
.procname = "ip_local_port_range",
.maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
.data = &init_net.ipv4.ip_local_ports.range,
@@ -988,6 +988,8 @@
if (!net->ipv4.sysctl_local_reserved_ports)
goto err_ports;
+ net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
+
return 0;
err_ports: