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Message-ID: <1464043706-2843932-3-git-send-email-tom@herbertland.com>
Date: Mon, 23 May 2016 15:48:21 -0700
From: Tom Herbert <tom@...bertland.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: <kernel-team@...com>
Subject: [RFC PATCH 2/7] tou: Base infrastructure for Transport over UDP
Add tou.c that implements common setsockopt functionality. This includes
initialization and argument structure for the setsockopt.
Signed-off-by: Tom Herbert <tom@...bertland.com>
---
include/uapi/linux/if_tunnel.h | 10 ++++
net/ipv4/Makefile | 3 +-
net/ipv4/af_inet.c | 4 ++
net/ipv4/tou.c | 132 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 148 insertions(+), 1 deletion(-)
create mode 100644 net/ipv4/tou.c
diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h
index af4de90..c6b4afa 100644
--- a/include/uapi/linux/if_tunnel.h
+++ b/include/uapi/linux/if_tunnel.h
@@ -71,6 +71,16 @@ enum tunnel_encap_types {
#define TUNNEL_ENCAP_FLAG_CSUM6 (1<<1)
#define TUNNEL_ENCAP_FLAG_REMCSUM (1<<2)
+/* Structure for Transport Over UDP (TOU) encapsulation. This is used in
+ * setsockopt of inet sockets.
+ */
+struct tou_encap {
+ u16 type; /* enum tunnel_encap_types */
+ u16 flags;
+ __be16 sport;
+ __be16 dport;
+};
+
/* SIT-mode i_flags */
#define SIT_ISATAP 0x0001
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index bfa1336..3b46dd6 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -12,7 +12,8 @@ obj-y := route.o inetpeer.o protocol.o \
tcp_offload.o datagram.o raw.o udp.o udplite.o \
udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
fib_frontend.o fib_semantics.o fib_trie.o \
- inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o
+ inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o \
+ tou.o
obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 377424e..7a856f8 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -120,6 +120,7 @@
#include <linux/mroute.h>
#endif
#include <net/l3mdev.h>
+#include <net/tou.h>
/* The inetsw table contains everything that inet_create needs to
@@ -1822,6 +1823,9 @@ static int __init inet_init(void)
/* Add UDP-Lite (RFC 3828) */
udplite4_register();
+ /* Set TOU slab cache (Transport layer encapsulation over UDP) */
+ tou_init();
+
ping_init();
/*
diff --git a/net/ipv4/tou.c b/net/ipv4/tou.c
new file mode 100644
index 0000000..601466a
--- /dev/null
+++ b/net/ipv4/tou.c
@@ -0,0 +1,132 @@
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <net/genetlink.h>
+#include <net/gue.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/udp.h>
+#include <net/udp_tunnel.h>
+#include <net/xfrm.h>
+#include <net/tou.h>
+#include <net/ip6_tunnel.h>
+#include <uapi/linux/fou.h>
+#include <uapi/linux/genetlink.h>
+
+static struct kmem_cache *tou_cachep __read_mostly;
+
+int tou_encap_setsockopt(struct sock *sk, char __user *optval, int optlen,
+ bool is_ipv6)
+{
+ struct tou_encap te;
+ struct ip_tunnel_encap encap;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ip_tunnel_encap *e = inet->tou_encap;
+ int hlen = 0, old_hlen = 0;
+
+ if (optlen < sizeof(te))
+ return -EINVAL;
+
+ if (copy_from_user(&te, optval, sizeof(te)))
+ return -EFAULT;
+
+ if (e) {
+ old_hlen = is_ipv6 ? ip6_encap_hlen(e) : ip_encap_hlen(e);
+ if (unlikely(old_hlen < 0))
+ return -EINVAL;
+ }
+
+ if (te.type == TUNNEL_ENCAP_NONE) {
+ if (e) {
+ if (unlikely(old_hlen < 0))
+ return -EINVAL;
+
+ inet->tou_encap = NULL;
+ kmem_cache_free(tou_cachep, e);
+
+ goto adjust_ext_hdr;
+ } else {
+ return 0;
+ }
+ }
+
+ memset(&encap, 0, sizeof(encap));
+ encap.type = te.type;
+ encap.sport = te.sport;
+ encap.dport = te.dport;
+ encap.flags = te.flags;
+
+ hlen = is_ipv6 ? ip6_encap_hlen(e) : ip_encap_hlen(e);
+ if (hlen < 0)
+ return hlen;
+
+ if (!e) {
+ e = kmem_cache_alloc(tou_cachep, GFP_KERNEL);
+ if (!e)
+ return -ENOMEM;
+ inet->tou_encap = e;
+ }
+
+ *e = encap;
+
+adjust_ext_hdr:
+ if (inet->is_icsk) {
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ /* For a connected socket add the overhead of encapsulation
+ * (specifically the difference between the new encapsulation
+ * and the old one it present) into the extrenal header length
+ * and adjust the mss.
+ */
+ icsk->icsk_ext_hdr_len += (hlen - old_hlen);
+ icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(tou_encap_setsockopt);
+
+int tou_encap_getsockopt(struct sock *sk, char __user *optval,
+ int len, int __user *optlen, bool is_ipv6)
+{
+ struct tou_encap te;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ip_tunnel_encap *e = inet->tou_encap;
+
+ if (len < sizeof(te))
+ return -EINVAL;
+
+ len = sizeof(te);
+
+ memset(&te, 0, sizeof(te));
+
+ if (!e) {
+ te.type = TUNNEL_ENCAP_NONE;
+ } else {
+ te.type = e->type;
+ te.sport = e->sport;
+ te.dport = e->dport;
+ te.flags = e->flags;
+ }
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+
+ if (copy_to_user(optval, &te, len))
+ return -EFAULT;
+
+ return 0;
+}
+EXPORT_SYMBOL(tou_encap_getsockopt);
+
+void __init tou_init(void)
+{
+ tou_cachep = kmem_cache_create("tou_cache",
+ sizeof(struct ip_tunnel_encap), 0,
+ SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+}
--
2.8.0.rc2
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