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Message-ID: <6a62426745e9689ab18ca60a1560e047f78884f9.1700220201.git.antony.antony@secunet.com>
Date: Fri, 17 Nov 2023 12:26:16 +0100
From: Antony Antony <antony.antony@...unet.com>
To: Steffen Klassert <steffen.klassert@...unet.com>
CC: Florian Westphal <fw@...len.de>, Herbert Xu <herbert@...dor.apana.org.au>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>, "David S. Miller"
<davem@...emloft.net>, David Ahern <dsahern@...nel.org>, Jakub Kicinski
<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Andreas Gruenbacher
<agruenba@...hat.com>, <devel@...ux-ipsec.org>, <netdev@...r.kernel.org>
Subject: [PATCH ipsec-next] udpencap: Remove Obsolete
UDP_ENCAP_ESPINUDP_NON_IKE Support
The UDP_ENCAP_ESPINUDP_NON_IKE mode, introduced into the Linux kernel
in 2004 [2], has remained inactive and obsolete for an extended period.
This mode was originally defined in an early version of an IETF draft
[1] from 2001. By the time it was integrated into the kernel in 2004 [2],
it had already been replaced by UDP_ENCAP_ESPINUDP [3] in later
versions of draft-ietf-ipsec-udp-encaps, particularly in version 06.
Over time, UDP_ENCAP_ESPINUDP_NON_IKE has lost its relevance, with no
known use cases.
With this commit, we remove support for UDP_ENCAP_ESPINUDP_NON_IKE,
simplifying the codebase and eliminating unnecessary complexity.
Actually, we remove the functionality and wrap UDP_ENCAP_ESPINUDP_NON_IKE
defination in "#ifndef __KERNEL__". If it is used again in kernel code
your build will fail.
References:
[1] https://datatracker.ietf.org/doc/html/draft-ietf-ipsec-udp-encaps-00.txt
[2] Commit that added UDP_ENCAP_ESPINUDP_NON_IKE to the Linux historic
repository.
Author: Andreas Gruenbacher <agruen@...e.de>
Date: Fri Apr 9 01:47:47 2004 -0700
[IPSEC]: Support draft-ietf-ipsec-udp-encaps-00/01, some ipec impls need it.
[3] Commit that added UDP_ENCAP_ESPINUDP to the Linux historic
repository.
Author: Derek Atkins <derek@...fp.com>
Date: Wed Apr 2 13:21:02 2003 -0800
[IPSEC]: Implement UDP Encapsulation framework.
Signed-off-by: Antony Antony <antony.antony@...unet.com>
---
RFC -> v1
- keep removed defination wrapped in #ifndef __KERNEL__
---
include/uapi/linux/udp.h | 5 ++++-
net/ipv4/esp4.c | 12 ------------
net/ipv4/udp.c | 2 --
net/ipv4/xfrm4_input.c | 13 -------------
net/ipv6/esp6.c | 12 ------------
net/ipv6/xfrm6_input.c | 13 -------------
6 files changed, 4 insertions(+), 53 deletions(-)
diff --git a/include/uapi/linux/udp.h b/include/uapi/linux/udp.h
index 4828794efcf8..66344971d955 100644
--- a/include/uapi/linux/udp.h
+++ b/include/uapi/linux/udp.h
@@ -36,7 +36,10 @@ struct udphdr {
#define UDP_GRO 104 /* This socket can receive UDP GRO packets */
/* UDP encapsulation types */
-#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
+#ifndef __KERNEL__
+#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* (obsolete) draft-ietf-ipsec-nat-t-ike-00/01 */
+#endif
+
#define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */
#define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */
#define UDP_ENCAP_GTP0 4 /* GSM TS 09.60 */
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 4ccfc104f13a..eea61260d902 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -347,7 +347,6 @@ static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb,
__be16 dport)
{
struct udphdr *uh;
- __be32 *udpdata32;
unsigned int len;
len = skb->len + esp->tailen - skb_transport_offset(skb);
@@ -362,12 +361,6 @@ static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb,
*skb_mac_header(skb) = IPPROTO_UDP;
- if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
- udpdata32 = (__be32 *)(uh + 1);
- udpdata32[0] = udpdata32[1] = 0;
- return (struct ip_esp_hdr *)(udpdata32 + 2);
- }
-
return (struct ip_esp_hdr *)(uh + 1);
}
@@ -423,7 +416,6 @@ static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb,
switch (encap_type) {
default:
case UDP_ENCAP_ESPINUDP:
- case UDP_ENCAP_ESPINUDP_NON_IKE:
esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport);
break;
case TCP_ENCAP_ESPINTCP:
@@ -775,7 +767,6 @@ int esp_input_done2(struct sk_buff *skb, int err)
source = th->source;
break;
case UDP_ENCAP_ESPINUDP:
- case UDP_ENCAP_ESPINUDP_NON_IKE:
source = uh->source;
break;
default:
@@ -1179,9 +1170,6 @@ static int esp_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)
case UDP_ENCAP_ESPINUDP:
x->props.header_len += sizeof(struct udphdr);
break;
- case UDP_ENCAP_ESPINUDP_NON_IKE:
- x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
- break;
#ifdef CONFIG_INET_ESPINTCP
case TCP_ENCAP_ESPINTCP:
/* only the length field, TCP encap is done by
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 89e5a806b82e..31727d2c13c6 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2693,8 +2693,6 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
#ifdef CONFIG_XFRM
case UDP_ENCAP_ESPINUDP:
set_xfrm_gro_udp_encap_rcv(val, sk->sk_family, sk);
- fallthrough;
- case UDP_ENCAP_ESPINUDP_NON_IKE:
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6)
WRITE_ONCE(up->encap_rcv,
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index c54676998eb6..067a422e5e40 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -113,19 +113,6 @@ static int __xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb, bool pull
/* Must be an IKE packet.. pass it through */
return 1;
break;
- case UDP_ENCAP_ESPINUDP_NON_IKE:
- /* Check if this is a keepalive packet. If so, eat it. */
- if (len == 1 && udpdata[0] == 0xff) {
- return -EINVAL;
- } else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) &&
- udpdata32[0] == 0 && udpdata32[1] == 0) {
-
- /* ESP Packet with Non-IKE marker */
- len = sizeof(struct udphdr) + 2 * sizeof(u32);
- } else
- /* Must be an IKE packet.. pass it through */
- return 1;
- break;
}
/* At this point we are sure that this is an ESPinUDP packet,
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 2cc1a45742d8..39d94638398d 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -383,7 +383,6 @@ static struct ip_esp_hdr *esp6_output_udp_encap(struct sk_buff *skb,
__be16 dport)
{
struct udphdr *uh;
- __be32 *udpdata32;
unsigned int len;
len = skb->len + esp->tailen - skb_transport_offset(skb);
@@ -398,12 +397,6 @@ static struct ip_esp_hdr *esp6_output_udp_encap(struct sk_buff *skb,
*skb_mac_header(skb) = IPPROTO_UDP;
- if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
- udpdata32 = (__be32 *)(uh + 1);
- udpdata32[0] = udpdata32[1] = 0;
- return (struct ip_esp_hdr *)(udpdata32 + 2);
- }
-
return (struct ip_esp_hdr *)(uh + 1);
}
@@ -459,7 +452,6 @@ static int esp6_output_encap(struct xfrm_state *x, struct sk_buff *skb,
switch (encap_type) {
default:
case UDP_ENCAP_ESPINUDP:
- case UDP_ENCAP_ESPINUDP_NON_IKE:
esph = esp6_output_udp_encap(skb, encap_type, esp, sport, dport);
break;
case TCP_ENCAP_ESPINTCP:
@@ -822,7 +814,6 @@ int esp6_input_done2(struct sk_buff *skb, int err)
source = th->source;
break;
case UDP_ENCAP_ESPINUDP:
- case UDP_ENCAP_ESPINUDP_NON_IKE:
source = uh->source;
break;
default:
@@ -1232,9 +1223,6 @@ static int esp6_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)
case UDP_ENCAP_ESPINUDP:
x->props.header_len += sizeof(struct udphdr);
break;
- case UDP_ENCAP_ESPINUDP_NON_IKE:
- x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
- break;
#ifdef CONFIG_INET6_ESPINTCP
case TCP_ENCAP_ESPINTCP:
/* only the length field, TCP encap is done by
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index 6e36e5047fba..093cff85f61f 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -109,19 +109,6 @@ static int __xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb, bool pull
/* Must be an IKE packet.. pass it through */
return 1;
break;
- case UDP_ENCAP_ESPINUDP_NON_IKE:
- /* Check if this is a keepalive packet. If so, eat it. */
- if (len == 1 && udpdata[0] == 0xff) {
- return -EINVAL;
- } else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) &&
- udpdata32[0] == 0 && udpdata32[1] == 0) {
-
- /* ESP Packet with Non-IKE marker */
- len = sizeof(struct udphdr) + 2 * sizeof(u32);
- } else
- /* Must be an IKE packet.. pass it through */
- return 1;
- break;
}
/* At this point we are sure that this is an ESPinUDP packet,
--
2.30.2
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