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ipv4: Namespaceify ip_default_ttl sysctl knob

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Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Borisov 2016-02-15 12:11:27 +02:00 committed by David S. Miller
parent 6cd21d7941
commit fa50d974d1
8 changed files with 26 additions and 21 deletions
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1
include/net/netns/ipv4.h
View File

@ -80,6 +80,7 @@ struct netns_ipv4 {
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;

5
include/net/route.h
View File

@ -329,14 +329,13 @@ static inline int inet_iif(const struct sk_buff *skb)
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;
}

8
net/bridge/netfilter/nft_reject_bridge.c
View File

@ -48,6 +48,7 @@ static void nft_reject_br_send_v4_tcp_reset(struct sk_buff *oldskb,
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 @@ static void nft_reject_br_send_v4_tcp_reset(struct sk_buff *oldskb,
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 @@ static void nft_reject_br_send_v4_unreach(struct sk_buff *oldskb,
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 @@ static void nft_reject_br_send_v4_unreach(struct sk_buff *oldskb,
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));

3
net/ipv4/ip_output.c
View File

@ -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,

5
net/ipv4/ip_sockglue.c
View File

@ -1341,10 +1341,13 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
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;

3
net/ipv4/netfilter/ipt_SYNPROXY.c
View File

@ -21,6 +21,7 @@ static struct iphdr *
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 @@ synproxy_build_ip(struct sk_buff *skb, __be32 saddr, __be32 daddr)
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;

2
net/ipv4/proc.c
View File

@ -390,7 +390,7 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
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++)

20
net/ipv4/sysctl_net_ipv4.c
View File

@ -282,15 +282,6 @@ static struct ctl_table ipv4_table[] = {
.mode = 0644,
.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,
@ -752,6 +743,15 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.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),
@ -988,6 +988,8 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
if (!net->ipv4.sysctl_local_reserved_ports)
goto err_ports;
net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
return 0;
err_ports: