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tcp: Namespaceify sysctl_tcp_sack

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Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-06-07 10:34:37 -07:00 committed by David S. Miller
parent eed29f17f0
commit f930103421
8 changed files with 18 additions and 16 deletions
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1
include/net/netns/ipv4.h
View File

@ -122,6 +122,7 @@ struct netns_ipv4 {
int sysctl_tcp_fin_timeout;
unsigned int sysctl_tcp_notsent_lowat;
int sysctl_tcp_tw_reuse;
int sysctl_tcp_sack;
struct inet_timewait_death_row tcp_death_row;
int sysctl_max_syn_backlog;

4
include/net/tcp.h
View File

@ -239,7 +239,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
/* sysctl variables for tcp */
extern int sysctl_tcp_timestamps;
extern int sysctl_tcp_window_scaling;
extern int sysctl_tcp_sack;
extern int sysctl_tcp_fastopen;
extern int sysctl_tcp_retrans_collapse;
extern int sysctl_tcp_stdurg;
@ -520,7 +519,8 @@ u32 __cookie_v4_init_sequence(const struct iphdr *iph, const struct tcphdr *th,
u16 *mssp);
__u32 cookie_v4_init_sequence(const struct sk_buff *skb, __u16 *mss);
u64 cookie_init_timestamp(struct request_sock *req);
bool cookie_timestamp_decode(struct tcp_options_received *opt);
bool cookie_timestamp_decode(const struct net *net,
struct tcp_options_received *opt);
bool cookie_ecn_ok(const struct tcp_options_received *opt,
const struct net *net, const struct dst_entry *dst);

7
net/ipv4/syncookies.c
View File

@ -232,7 +232,8 @@ EXPORT_SYMBOL(tcp_get_cookie_sock);
* return false if we decode a tcp option that is disabled
* on the host.
*/
bool cookie_timestamp_decode(struct tcp_options_received *tcp_opt)
bool cookie_timestamp_decode(const struct net *net,
struct tcp_options_received *tcp_opt)
{
/* echoed timestamp, lowest bits contain options */
u32 options = tcp_opt->rcv_tsecr;
@ -247,7 +248,7 @@ bool cookie_timestamp_decode(struct tcp_options_received *tcp_opt)
tcp_opt->sack_ok = (options & TS_OPT_SACK) ? TCP_SACK_SEEN : 0;
if (tcp_opt->sack_ok && !sysctl_tcp_sack)
if (tcp_opt->sack_ok && !net->ipv4.sysctl_tcp_sack)
return false;
if ((options & TS_OPT_WSCALE_MASK) == TS_OPT_WSCALE_MASK)
@ -319,7 +320,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
tcp_opt.rcv_tsecr -= tsoff;
}
if (!cookie_timestamp_decode(&tcp_opt))
if (!cookie_timestamp_decode(sock_net(sk), &tcp_opt))
goto out;
ret = NULL;

14
net/ipv4/sysctl_net_ipv4.c
View File

@ -378,13 +378,6 @@ static struct ctl_table ipv4_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "tcp_sack",
.data = &sysctl_tcp_sack,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "tcp_retrans_collapse",
.data = &sysctl_tcp_retrans_collapse,
@ -1116,6 +1109,13 @@ static struct ctl_table ipv4_net_table[] = {
.extra2 = &one,
},
#endif
{
.procname = "tcp_sack",
.data = &init_net.ipv4.sysctl_tcp_sack,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{ }
};

3
net/ipv4/tcp_input.c
View File

@ -78,7 +78,6 @@
int sysctl_tcp_timestamps __read_mostly = 1;
int sysctl_tcp_window_scaling __read_mostly = 1;
int sysctl_tcp_sack __read_mostly = 1;
int sysctl_tcp_fack __read_mostly;
int sysctl_tcp_max_reordering __read_mostly = 300;
int sysctl_tcp_dsack __read_mostly = 1;
@ -3790,7 +3789,7 @@ void tcp_parse_options(const struct net *net,
break;
case TCPOPT_SACK_PERM:
if (opsize == TCPOLEN_SACK_PERM && th->syn &&
!estab && sysctl_tcp_sack) {
!estab && net->ipv4.sysctl_tcp_sack) {
opt_rx->sack_ok = TCP_SACK_SEEN;
tcp_sack_reset(opt_rx);
}

1
net/ipv4/tcp_ipv4.c
View File

@ -2465,6 +2465,7 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo;
net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 256);
net->ipv4.sysctl_tcp_sack = 1;
return 0;
fail:

2
net/ipv4/tcp_output.c
View File

@ -580,7 +580,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
opts->options |= OPTION_WSCALE;
remaining -= TCPOLEN_WSCALE_ALIGNED;
}
if (likely(sysctl_tcp_sack)) {
if (likely(sock_net(sk)->ipv4.sysctl_tcp_sack)) {
opts->options |= OPTION_SACK_ADVERTISE;
if (unlikely(!(OPTION_TS & opts->options)))
remaining -= TCPOLEN_SACKPERM_ALIGNED;

2
net/ipv6/syncookies.c
View File

@ -170,7 +170,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
tcp_opt.rcv_tsecr -= tsoff;
}
if (!cookie_timestamp_decode(&tcp_opt))
if (!cookie_timestamp_decode(sock_net(sk), &tcp_opt))
goto out;
ret = NULL;