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Date: Thu, 16 Jun 2016 10:52:00 -0700
From: Tom Herbert <tom@...bertland.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: <kernel-team@...com>
Subject: [PATCH net-next 6/8] ipv6: Support TOU
In transmit path (inet6_csk_xmit) check if encapsulation is enabled and
call the build header op if it is. Add IP_TOU_ENCAP setsockopt for IPv6
sockets.
Signed-off-by: Tom Herbert <tom@...bertland.com>
---
include/uapi/linux/in6.h | 1 +
net/ipv6/inet6_connection_sock.c | 58 ++++++++++++++++++++++++++++++++++------
net/ipv6/ipv6_sockglue.c | 7 +++++
3 files changed, 58 insertions(+), 8 deletions(-)
diff --git a/include/uapi/linux/in6.h b/include/uapi/linux/in6.h
index 318a482..9a610c3 100644
--- a/include/uapi/linux/in6.h
+++ b/include/uapi/linux/in6.h
@@ -282,6 +282,7 @@ struct in6_flowlabel_req {
#define IPV6_RECVORIGDSTADDR IPV6_ORIGDSTADDR
#define IPV6_TRANSPARENT 75
#define IPV6_UNICAST_IF 76
+#define IPV6_TOU_ENCAP 77
/*
* Multicast Routing:
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index 532c3ef..6c971bc 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -24,6 +24,7 @@
#include <net/inet_ecn.h>
#include <net/inet_hashtables.h>
#include <net/ip6_route.h>
+#include <net/ip6_tunnel.h>
#include <net/sock.h>
#include <net/inet6_connection_sock.h>
#include <net/sock_reuseport.h>
@@ -118,13 +119,11 @@ struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
return __sk_dst_check(sk, cookie);
}
-static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
- struct flowi6 *fl6)
+static void inet6_csk_fill_flowi6(struct sock *sk,
+ struct flowi6 *fl6)
{
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
- struct in6_addr *final_p, final;
- struct dst_entry *dst;
memset(fl6, 0, sizeof(*fl6));
fl6->flowi6_proto = sk->sk_protocol;
@@ -137,6 +136,14 @@ static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
fl6->fl6_sport = inet->inet_sport;
fl6->fl6_dport = inet->inet_dport;
security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
+}
+
+static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
+ struct flowi6 *fl6)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *final_p, final;
+ struct dst_entry *dst;
rcu_read_lock();
final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
@@ -154,20 +161,48 @@ static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
{
+ struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct flowi6 fl6;
struct dst_entry *dst;
int res;
+ u8 protocol = sk->sk_protocol;
+ struct ip_tunnel_encap *e = inet->tou_encap;
+
+ inet6_csk_fill_flowi6(sk, &fl6);
+
+ rcu_read_lock();
+
+ e = rcu_dereference(inet->tou_encap);
+ if (e) {
+ const struct ip6_tnl_encap_ops *ops;
+
+ /* Transport layer protocol over UDP enapsulation */
+ ops = rcu_dereference(ip6tun_encaps[e->type]);
+ if (likely(ops && ops->build_header)) {
+ res = ops->build_header(skb, e, &protocol,
+ &fl6, sock_net(sk));
+ if (res < 0)
+ goto fail;
+ } else {
+ res = -EINVAL;
+ goto fail;
+ }
+
+ /* Changing ports and protocol to be routed */
+ fl6.fl6_sport = e->sport;
+ fl6.fl6_dport = e->dport;
+ fl6.flowi6_proto = protocol;
+ }
dst = inet6_csk_route_socket(sk, &fl6);
if (IS_ERR(dst)) {
sk->sk_err_soft = -PTR_ERR(dst);
sk->sk_route_caps = 0;
- kfree_skb(skb);
- return PTR_ERR(dst);
+ res = PTR_ERR(dst);
+ goto fail;
}
- rcu_read_lock();
skb_dst_set_noref(skb, dst);
/* Restore final destination back after routing done */
@@ -177,14 +212,21 @@ int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused
np->tclass);
rcu_read_unlock();
return res;
+fail:
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return res;
}
EXPORT_SYMBOL_GPL(inet6_csk_xmit);
struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
{
struct flowi6 fl6;
- struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
+ struct dst_entry *dst;
+
+ inet6_csk_fill_flowi6(sk, &fl6);
+ dst = inet6_csk_route_socket(sk, &fl6);
if (IS_ERR(dst))
return NULL;
dst->ops->update_pmtu(dst, sk, NULL, mtu);
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index a9895e1..1697c0e 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -52,6 +52,7 @@
#include <net/udplite.h>
#include <net/xfrm.h>
#include <net/compat.h>
+#include <net/tou.h>
#include <asm/uaccess.h>
@@ -868,6 +869,9 @@ pref_skip_coa:
np->autoflowlabel = valbool;
retv = 0;
break;
+ case IPV6_TOU_ENCAP:
+ retv = tou_encap_setsockopt(sk, optval, optlen, true);
+ break;
}
release_sock(sk);
@@ -1310,6 +1314,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = np->autoflowlabel;
break;
+ case IPV6_TOU_ENCAP:
+ return tou_encap_getsockopt(sk, optval, len, optlen, true);
+
default:
return -ENOPROTOOPT;
}
--
2.8.0.rc2
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