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Date: Sat, 5 Jan 2013 16:01:30 +0100
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: netdev@...r.kernel.org
Cc: eric.dumazet@...il.com, davem@...emloft.net, shemminger@...tta.com
Subject: [PATCH] tcp: make sysctl_tcp_ecn namespace aware
As per suggestion from Eric Dumazet this patch makes tcp_ecn sysctl aware.
The reason behind this patch is to ease the testing of ecn problems on
the internet and allows applications to tune their own use of ecn.
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: David Miller <davem@...emloft.net>
Cc: Stephen Hemminger <shemminger@...tta.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
include/net/netns/ipv4.h | 2 ++
include/net/tcp.h | 7 ++++---
net/ipv4/syncookies.c | 6 ++++--
net/ipv4/sysctl_net_ipv4.c | 16 +++++++++-------
net/ipv4/tcp_input.c | 2 --
net/ipv4/tcp_ipv4.c | 4 +++-
net/ipv4/tcp_output.c | 1 +
net/ipv6/syncookies.c | 3 ++-
net/ipv6/tcp_ipv6.c | 7 +++++--
9 files changed, 30 insertions(+), 18 deletions(-)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 2ae2b83..9b78862 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -61,6 +61,8 @@ struct netns_ipv4 {
int sysctl_icmp_ratemask;
int sysctl_icmp_errors_use_inbound_ifaddr;
+ int sysctl_tcp_ecn;
+
kgid_t sysctl_ping_group_range[2];
long sysctl_tcp_mem[3];
diff --git a/include/net/tcp.h b/include/net/tcp.h
index aed42c7..a808c59 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -266,7 +266,6 @@ extern int sysctl_tcp_abort_on_overflow;
extern int sysctl_tcp_max_orphans;
extern int sysctl_tcp_fack;
extern int sysctl_tcp_reordering;
-extern int sysctl_tcp_ecn;
extern int sysctl_tcp_dsack;
extern int sysctl_tcp_wmem[3];
extern int sysctl_tcp_rmem[3];
@@ -504,7 +503,8 @@ static inline __u32 cookie_v4_init_sequence(struct sock *sk,
#endif
extern __u32 cookie_init_timestamp(struct request_sock *req);
-extern bool cookie_check_timestamp(struct tcp_options_received *opt, bool *);
+extern bool cookie_check_timestamp(struct tcp_options_received *opt,
+ int sysctl_tcp_ecn, bool *ecn_ok);
/* From net/ipv6/syncookies.c */
extern struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb);
@@ -728,7 +728,8 @@ struct tcp_skb_cb {
* notifications, we disable TCP ECN negociation.
*/
static inline void
-TCP_ECN_create_request(struct request_sock *req, const struct sk_buff *skb)
+TCP_ECN_create_request(struct request_sock *req, const struct sk_buff *skb,
+ int sysctl_tcp_ecn)
{
const struct tcphdr *th = tcp_hdr(skb);
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index b236ef0..f51c3f5 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -232,7 +232,8 @@ static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
*
* return false if we decode an option that should not be.
*/
-bool cookie_check_timestamp(struct tcp_options_received *tcp_opt, bool *ecn_ok)
+bool cookie_check_timestamp(struct tcp_options_received *tcp_opt,
+ int sysctl_tcp_ecn, bool *ecn_ok)
{
/* echoed timestamp, lowest bits contain options */
u32 options = tcp_opt->rcv_tsecr & TSMASK;
@@ -279,6 +280,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
__u8 rcv_wscale;
bool ecn_ok = false;
struct flowi4 fl4;
+ int sysctl_tcp_ecn = sock_net(sk)->ipv4.sysctl_tcp_ecn;
if (!sysctl_tcp_syncookies || !th->ack || th->rst)
goto out;
@@ -295,7 +297,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
memset(&tcp_opt, 0, sizeof(tcp_opt));
tcp_parse_options(skb, &tcp_opt, &hash_location, 0, NULL);
- if (!cookie_check_timestamp(&tcp_opt, &ecn_ok))
+ if (!cookie_check_timestamp(&tcp_opt, sysctl_tcp_ecn, &ecn_ok))
goto out;
ret = NULL;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index d84400b..7716d40 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -538,13 +538,6 @@ static struct ctl_table ipv4_table[] = {
.proc_handler = proc_dointvec
},
{
- .procname = "tcp_ecn",
- .data = &sysctl_tcp_ecn,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
.procname = "tcp_dsack",
.data = &sysctl_tcp_dsack,
.maxlen = sizeof(int),
@@ -850,6 +843,13 @@ static struct ctl_table ipv4_net_table[] = {
.proc_handler = ipv4_ping_group_range,
},
{
+ .procname = "tcp_ecn",
+ .data = &init_net.ipv4.sysctl_tcp_ecn,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
.procname = "tcp_mem",
.maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
.mode = 0644,
@@ -882,6 +882,8 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
&net->ipv4.sysctl_icmp_ratemask;
table[6].data =
&net->ipv4.sysctl_ping_group_range;
+ table[7].data =
+ &net->ipv4.sysctl_tcp_ecn;
/* Don't export sysctls to unprivileged users */
if (net->user_ns != &init_user_ns)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a28e4db..38e1184 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -81,8 +81,6 @@ int sysctl_tcp_sack __read_mostly = 1;
int sysctl_tcp_fack __read_mostly = 1;
int sysctl_tcp_reordering __read_mostly = TCP_FASTRETRANS_THRESH;
EXPORT_SYMBOL(sysctl_tcp_reordering);
-int sysctl_tcp_ecn __read_mostly = 2;
-EXPORT_SYMBOL(sysctl_tcp_ecn);
int sysctl_tcp_dsack __read_mostly = 1;
int sysctl_tcp_app_win __read_mostly = 31;
int sysctl_tcp_adv_win_scale __read_mostly = 1;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 54139fa..70215e7 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1568,7 +1568,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
goto drop_and_free;
if (!want_cookie || tmp_opt.tstamp_ok)
- TCP_ECN_create_request(req, skb);
+ TCP_ECN_create_request(req, skb,
+ sock_net(sk)->ipv4.sysctl_tcp_ecn);
if (want_cookie) {
isn = cookie_v4_init_sequence(sk, skb, &req->mss);
@@ -2888,6 +2889,7 @@ EXPORT_SYMBOL(tcp_prot);
static int __net_init tcp_sk_init(struct net *net)
{
+ net->ipv4.sysctl_tcp_ecn = 2;
return 0;
}
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 5d45159..a407f92 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -312,6 +312,7 @@ static inline void TCP_ECN_send_synack(const struct tcp_sock *tp, struct sk_buff
static inline void TCP_ECN_send_syn(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
+ int sysctl_tcp_ecn = sock_net(sk)->ipv4.sysctl_tcp_ecn;
tp->ecn_flags = 0;
if (sysctl_tcp_ecn == 1) {
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 4016197..2a632ed 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -163,6 +163,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
struct dst_entry *dst;
__u8 rcv_wscale;
bool ecn_ok = false;
+ int sysctl_tcp_ecn = sock_net(sk)->ipv4.sysctl_tcp_ecn;
if (!sysctl_tcp_syncookies || !th->ack || th->rst)
goto out;
@@ -179,7 +180,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
memset(&tcp_opt, 0, sizeof(tcp_opt));
tcp_parse_options(skb, &tcp_opt, &hash_location, 0, NULL);
- if (!cookie_check_timestamp(&tcp_opt, &ecn_ok))
+ if (!cookie_check_timestamp(&tcp_opt, sysctl_tcp_ecn, &ecn_ok))
goto out;
ret = NULL;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 93825dd..932d667 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1026,8 +1026,11 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
treq = inet6_rsk(req);
treq->rmt_addr = ipv6_hdr(skb)->saddr;
treq->loc_addr = ipv6_hdr(skb)->daddr;
- if (!want_cookie || tmp_opt.tstamp_ok)
- TCP_ECN_create_request(req, skb);
+ if (!want_cookie || tmp_opt.tstamp_ok) {
+ /* we reuse the ipv4 sysctl for ecn here */
+ TCP_ECN_create_request(req, skb,
+ sock_net(sk)->ipv4.sysctl_tcp_ecn);
+ }
treq->iif = sk->sk_bound_dev_if;
--
1.7.11.7
--
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