From nobody Sat Sep 26 13:47:36 2026 Received: from mail-pz2-f12.google.com (mail-pz2-f12.google.com [74.125.228.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6291F407CDF for ; Fri, 25 Sep 2026 06:03:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.228.12 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790316194; cv=none; b=WolvUGlrfrH+pAyMIYh+G9pwXkmS8MXGQ0SEi+4RmpNfnnrRdtIE6UR+VvEy7QL8cTGhQpLvt6j4YSPNDwAv1qZDUuo2mNYMFXLFiU/BPnf5gHsZZz6eW5ttidSYXkEmKO10CpvzwzwJSI/BcrerjES6/WCPe4S5JBdaEDSJSZY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790316194; c=relaxed/simple; bh=uZL/LHHDY7t0ecNs2gTtsqMdjjFzKHohDM0f5vswsGc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=eqa8Aidoli3ASIVhgTFK7dLSZt3XaWjx6mfnfOvBofIw8HBOARM1xJ0eHpynbpxM4m1NUeEB8orH3PH6okluoYopdZW/EQxE67OxgNAQHcDqG/fN5GT9qH285aTqWydjMPaJxF8Pg9VXmJERc31oN1gmtHz9WREW8y6Av+Cz4xc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=LoM5kqwO; arc=none smtp.client-ip=74.125.228.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="LoM5kqwO" Received: by mail-pz2-f12.google.com with SMTP id 41be03b00d2f7-cc1cea4bfd1so188345a12.0 for ; Thu, 24 Sep 2026 23:03:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790316192; x=1790920992; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=b9ais05jlRg2Tw2BIaDhhrAcJ9Zw+jurNPkW15w/FeU=; b=LoM5kqwOJJNWN7nyKvGi8My+JiMwuDkcgDzYeiHjJvyN7ZtSMdRzwGGe/g7sNf1aAq FIjAUO6EvQQMrNvz0WruMObHy2m18E5ixiKEDGoCGeWIBAVicrwuNmddnLafG6g8iiJI xiVPa5GMuIGP2E1svN46yq+kotoB1A5lX1F/sIGwXLmgEsTtBxJX1Dy76fkjj43oYkdO CRM7UEnReqTeQ5EQrp7gTrAHNplWSZQrKD/+2aDTCTzyoWpZTzOUk8CP7KlJXgp9c2XK PQguIDEjr3Ed9INA27m2tX++4QdB8RU8TyqZQLn+k7fakk8L8Wg58mZ6H+A/rQB0m3b8 WswA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790316192; x=1790920992; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=b9ais05jlRg2Tw2BIaDhhrAcJ9Zw+jurNPkW15w/FeU=; b=CboWVdGp+odzmwbpRkitzw6pkNtjJsSTTfK1iBRmRamZkOwogxkORjRFoS0mVAtjen WMoRIwvd3EqN3BkzpgJiKhAx03ztmlQzDyShHQVNzgERUepUq9t4g2y50NsmvGqgz0pH FoWP4IuBZwNI02rEDC3mVMDH8TMe6Kas0gc2Uj0eF/9mJOwepEb1HAFS+e1mhCwnk+HO 4afggNDkdOwzgTSF34zg2enyLuob5ApE7lmb8os6OwQWS3PhP42W7nuK6EJyXDTdO4b9 AAjiKoWQPX2Bzz3WCroM9YcytlnDL3PPB4HDG23zW6OH4aYJH15ovcxcE0kCSs9rCqgX 4LvQ== X-Forwarded-Encrypted: i=1; AKwUvBy7kxd2jMkLy0VDzp43YAmEOmPJkalVR49v4YfLFMnahm/MQqjK205qZzAPRN7QispsK7Qgq8JuYaESouA=@vger.kernel.org X-Gm-Message-State: AFuF++nvoPEZoJhGzIDsC5QejWZN4SdPcbIyz/NaYnqTZm1BQcuVwEdZ XKRz92ShWzbt9Tzu//qdbyV5xuTPSIbeDMXl8g613isnu4qKJjV+hgKX X-Gm-Gg: AYBFou2FNGmu2EPcZc73MVyJKveLc+CXgNnrlNqE75qTdjUsItFaEVuMiUD8FC4QeWT COrjnt3ENa5nZNW7EDRveR904S2XO2prusB/r79NTNYhs7/9arfl3BBkwkO11cnvNoVRbvYqRYf JBtdddakEwvFa/NYKLwyheI4mJSK7Tz9WvY4uBbXul+Yp/6Q8TZ1fieNr59A65cjclKUfO8yvQH ZzEV2iT3dGZDRa4fWIO+n8tFvY1ZMN/JTIuzWE+zD+XVdMB3wlzaMHGL+ULWXh2FCqR9NQrkaLN 1mwMGByfs1O/pHNDgT48PTRsh+M/u8ekK7jeH5tjJBpZFJMnWo7qxWGnIyJIY58ah5pzT0kahyQ YUT7OGG1NrN4B6Yw4Mw8YktIbhR4PXvQYtl/5EIz342u0giG7+9MUCj0MvzKW8GVt8OQKONtIeY 3lAM0tqpACZcGIS1mPo27eSveTbJwXPQaijk0XfTzI8H+kx4zijpoH2i/r0hVPeNMEN0JzfNydN qVHMtEL X-Received: by 2002:a05:6a21:4ea8:b0:3dd:a00a:7ace with SMTP id adf61e73a8af0-3de0e8e8a86mr4437296637.59.1790316191437; Thu, 24 Sep 2026 23:03:11 -0700 (PDT) Received: from [163.43.103.131] ([163.43.103.131]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc78795dd54sm645963a12.30.2026.09.24.23.03.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2026 23:03:10 -0700 (PDT) From: Yuya Kusakabe Date: Fri, 25 Sep 2026 15:03:03 +0900 Subject: [PATCH RFC net-next v4 1/2] seg6: add support for the SRv6 End.MAP behavior Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260925-seg6-mobile-end-map-v4-1-457733c08586@gmail.com> References: <20260925-seg6-mobile-end-map-v4-0-457733c08586@gmail.com> In-Reply-To: <20260925-seg6-mobile-end-map-v4-0-457733c08586@gmail.com> To: Andrea Mayer , Andrea Mayer , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , David Ahern , Ido Schimmel , Shuah Khan Cc: Justin Iurman , Florian Westphal , Fernando Fernandez Mancera , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Yuya Kusakabe X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=26508; i=yuya.kusakabe@gmail.com; h=from:subject:message-id; bh=uZL/LHHDY7t0ecNs2gTtsqMdjjFzKHohDM0f5vswsGc=; b=owEBbQKS/ZANAwAIASrX0XUqXRtNAcsmYgBqtg6YZ7IFFoclS+IL/j9oYd591RANCLLdJN2eo W+8VeZSMOuJAjMEAAEIAB0WIQTaB7usAfxNKMeqa6Yq19F1Kl0bTQUCarYOmAAKCRAq19F1Kl0b TUeGD/9nDKV7CXwghxBEqvfYJnWvlASiAjzVhgBFkMVNus6X+hVRBOeI4ETFEO0cQuGgfhW69Uc Euo5yatGN2Gcqk1vN2EuujJDAogQxO7TLEZZECb4KhL82uNQek3NQgn5cgdpOvd2ae+8lmGx4ox 56hHH8/cjqrpRfwTpBx3K9/rO9YLJMt/p4jOhcDYwbsNYFH701C0WKKnAbAAzI9jzQWWERzDhiZ BbSwNq8MyORnxVjvIS+OHz3fDsfGGCrUKHzymuo1WOBqwH8WLqrv52z9SrAMf8Eh9XM6C4rRFnQ qUOmmUMJ1KrRP0atI3ZE4bmDekhh8byErQQ+Y7ICqp0UPxQaH+OtFPjvIK9dzVaXiAzAvryiNCH inwSRrKXwuViTYUGVQwYIGAtm/DunlCZ3dp76d5hf4WrCjxEtU031fBn842yvDTAc6y90U0KSmL QA/4KNbd9YimLrmcKkQgT3RLRhLkE84k4fKkvX7X3FDUyDU2Wxgiq7DlrY+hq7trDT0AcI/olkA XrLbnxAkMbnuiz1q6IeMQOMySSR0PVS24mCmyDYWdo+M+epATzKLMIufSW4jXAX/Vb0MZNGQGa2 Z9qSVWp3rvq5e2575Xh+A9FbkoUD8xrFNUJ96RoNvbovpaDXtDSzVg8pmT35o0HDk3KG39+bI5C OsjxOShL/cLNX1w== X-Developer-Key: i=yuya.kusakabe@gmail.com; a=openpgp; fpr=DA07BBAC01FC4D28C7AA6BA62AD7D1752A5D1B4D SRv6 End.MAP is defined in RFC 9433 [1]. The SRv6 End.MAP is an SRv6 endpoint that replaces the IPv6 destination address with the configured mapped SID and forwards the packet via the IPv6 FIB without consuming the SRH. The SRv6 End.MAP Linux implementation is the first behavior of the SRv6 Mobile User Plane and introduces a dedicated LWTUNNEL_ENCAP_SEG6_MOBILE encap type, a CONFIG_IPV6_SEG6_MOBILE build option and a net/ipv6/seg6_mobile.c file that hosts the action dispatch table. The user-space ABI lives in include/uapi/linux/seg6_mobile.h under a SEG6_MOBILE_* namespace, kept separate from SEG6_LOCAL_* so that attributes whose semantics differ between behaviors do not overload the same UAPI table. The SRv6 End.MAP behavior can be instantiated using a command similar to the following: $ ip -6 route add 2001:db8:f::/64 encap seg6mobile action End.MAP \ mapped_sid 2001:db8:2::e dev eth0 We introduce the "seg6mobile" extension in iproute2 in a following patch. [1] https://www.rfc-editor.org/rfc/rfc9433.html Assisted-by: LLM Signed-off-by: Yuya Kusakabe --- include/net/seg6.h | 8 + include/uapi/linux/lwtunnel.h | 1 + include/uapi/linux/seg6_mobile.h | 61 ++++ net/core/lwtunnel.c | 2 + net/ipv6/Kconfig | 10 + net/ipv6/Makefile | 1 + net/ipv6/seg6.c | 7 + net/ipv6/seg6_mobile.c | 703 +++++++++++++++++++++++++++++++++++= ++++ 8 files changed, 793 insertions(+) diff --git a/include/net/seg6.h b/include/net/seg6.h index 82b3fbbcbb93..789e9bcc4773 100644 --- a/include/net/seg6.h +++ b/include/net/seg6.h @@ -64,6 +64,14 @@ static inline int seg6_local_init(void) { return 0; } static inline void seg6_local_exit(void) {} #endif =20 +#ifdef CONFIG_IPV6_SEG6_MOBILE +extern int seg6_mobile_init(void); +extern void seg6_mobile_exit(void); +#else +static inline int seg6_mobile_init(void) { return 0; } +static inline void seg6_mobile_exit(void) {} +#endif + extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduc= ed); extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags); extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt); diff --git a/include/uapi/linux/lwtunnel.h b/include/uapi/linux/lwtunnel.h index 229655ef792f..6e48f79c548e 100644 --- a/include/uapi/linux/lwtunnel.h +++ b/include/uapi/linux/lwtunnel.h @@ -16,6 +16,7 @@ enum lwtunnel_encap_types { LWTUNNEL_ENCAP_RPL, LWTUNNEL_ENCAP_IOAM6, LWTUNNEL_ENCAP_XFRM, + LWTUNNEL_ENCAP_SEG6_MOBILE, __LWTUNNEL_ENCAP_MAX, }; =20 diff --git a/include/uapi/linux/seg6_mobile.h b/include/uapi/linux/seg6_mob= ile.h new file mode 100644 index 000000000000..068ab91b2873 --- /dev/null +++ b/include/uapi/linux/seg6_mobile.h @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * SRv6 Mobile User Plane implementation + * + * Author: + * Yuya Kusakabe + */ +#ifndef _UAPI_LINUX_SEG6_MOBILE_H +#define _UAPI_LINUX_SEG6_MOBILE_H + +enum { + SEG6_MOBILE_UNSPEC, + SEG6_MOBILE_ACTION, + SEG6_MOBILE_MAPPED_SID, + SEG6_MOBILE_COUNTERS, + __SEG6_MOBILE_MAX, +}; + +#define SEG6_MOBILE_MAX (__SEG6_MOBILE_MAX - 1) + +enum { + SEG6_MOBILE_ACTION_UNSPEC =3D 0, + /* swap IPv6 DA with the mapped SID, leave SRH untouched */ + SEG6_MOBILE_ACTION_END_MAP =3D 1, + + __SEG6_MOBILE_ACTION_MAX, +}; + +#define SEG6_MOBILE_ACTION_MAX (__SEG6_MOBILE_ACTION_MAX - 1) + +/* SRv6 Mobile Behavior counters are encoded as netlink attributes + * guaranteeing the correct alignment. + * Each counter is identified by a different attribute type (i.e. + * SEG6_MOBILE_CNT_PACKETS). + * + * - SEG6_MOBILE_CNT_PACKETS: identifies a counter that counts the number + * of packets that have been CORRECTLY processed by an SRv6 Behavior + * instance (i.e., packets that generate errors or are dropped are NOT + * counted). + * + * - SEG6_MOBILE_CNT_BYTES: identifies a counter that counts the total + * amount of traffic in bytes of all packets that have been CORRECTLY + * processed by an SRv6 Behavior instance (i.e., packets that generate + * errors or are dropped are NOT counted). + * + * - SEG6_MOBILE_CNT_ERRORS: identifies a counter that counts the number + * of packets that have NOT been properly processed by an SRv6 Behavior + * instance (i.e., packets that generate errors or are dropped). + */ +enum { + SEG6_MOBILE_CNT_UNSPEC, + SEG6_MOBILE_CNT_PACKETS, + SEG6_MOBILE_CNT_BYTES, + SEG6_MOBILE_CNT_ERRORS, + SEG6_MOBILE_CNT_PAD, /* pad for 64 bits values */ + __SEG6_MOBILE_CNT_MAX, +}; + +#define SEG6_MOBILE_CNT_MAX (__SEG6_MOBILE_CNT_MAX - 1) + +#endif /* _UAPI_LINUX_SEG6_MOBILE_H */ diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c index b01a395d9a96..4476293ccb37 100644 --- a/net/core/lwtunnel.c +++ b/net/core/lwtunnel.c @@ -53,6 +53,8 @@ static const char *lwtunnel_encap_str(enum lwtunnel_encap= _types encap_type) case LWTUNNEL_ENCAP_XFRM: /* module autoload not supported for encap type */ return NULL; + case LWTUNNEL_ENCAP_SEG6_MOBILE: + return "SEG6MOBILE"; case LWTUNNEL_ENCAP_IP6: case LWTUNNEL_ENCAP_IP: case LWTUNNEL_ENCAP_NONE: diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig index c3806c6ac96f..e094b835a118 100644 --- a/net/ipv6/Kconfig +++ b/net/ipv6/Kconfig @@ -314,6 +314,16 @@ config IPV6_SEG6_BPF depends on IPV6_SEG6_LWTUNNEL depends on IPV6 =3D y =20 +config IPV6_SEG6_MOBILE + bool "IPv6: SRv6 Mobile User Plane (RFC 9433) behaviors" + depends on IPV6_SEG6_LWTUNNEL + help + Support for the SRv6 Mobile User Plane behaviors defined by + RFC 9433, exposed via the LWTUNNEL_ENCAP_SEG6_MOBILE lightweight + tunnel encapsulation. + + If unsure, say N. + config IPV6_RPL_LWTUNNEL bool "IPv6: RPL Source Routing Header support" depends on IPV6 diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile index cf5e01f83ce3..95961f180439 100644 --- a/net/ipv6/Makefile +++ b/net/ipv6/Makefile @@ -24,6 +24,7 @@ ipv6-$(CONFIG_SYN_COOKIES) +=3D syncookies.o ipv6-$(CONFIG_NETLABEL) +=3D calipso.o ipv6-$(CONFIG_IPV6_SEG6_LWTUNNEL) +=3D seg6_iptunnel.o seg6_local.o ipv6-$(CONFIG_IPV6_SEG6_HMAC) +=3D seg6_hmac.o +ipv6-$(CONFIG_IPV6_SEG6_MOBILE) +=3D seg6_mobile.o ipv6-$(CONFIG_IPV6_RPL_LWTUNNEL) +=3D rpl_iptunnel.o ipv6-$(CONFIG_IPV6_IOAM6_LWTUNNEL) +=3D ioam6_iptunnel.o =20 diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c index 8c2b156c227a..c7f71174b6d0 100644 --- a/net/ipv6/seg6.c +++ b/net/ipv6/seg6.c @@ -525,10 +525,16 @@ int __init seg6_init(void) if (err) goto out_unregister_iptun; =20 + err =3D seg6_mobile_init(); + if (err) + goto out_unregister_local; + pr_info("Segment Routing with IPv6\n"); =20 out: return err; +out_unregister_local: + seg6_local_exit(); out_unregister_iptun: seg6_iptunnel_exit(); out_unregister_genl: @@ -540,6 +546,7 @@ int __init seg6_init(void) =20 void seg6_exit(void) { + seg6_mobile_exit(); seg6_local_exit(); seg6_iptunnel_exit(); genl_unregister_family(&seg6_genl_family); diff --git a/net/ipv6/seg6_mobile.c b/net/ipv6/seg6_mobile.c new file mode 100644 index 000000000000..a7b79e20710c --- /dev/null +++ b/net/ipv6/seg6_mobile.c @@ -0,0 +1,703 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SRv6 Mobile User Plane implementation + * + * Author: + * Yuya Kusakabe + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#ifdef CONFIG_IPV6_SEG6_HMAC +#include +#endif +#include + +#define SEG6_MOBILE_F_ATTR(i) BIT(i) +#define SEG6_F_MOBILE_COUNTERS SEG6_MOBILE_F_ATTR(SEG6_MOBILE_COUNTERS) + +struct seg6_mobile_lwt; + +struct seg6_mobile_action_desc { + int action; + unsigned long attrs; + unsigned long optattrs; + int (*input)(struct sk_buff *skb, struct seg6_mobile_lwt *slwt); +}; + +struct seg6_mobile_action_param { + int (*parse)(struct nlattr **attrs, struct seg6_mobile_lwt *slwt, + struct netlink_ext_ack *extack); + int (*put)(struct sk_buff *skb, struct seg6_mobile_lwt *slwt); + int (*cmp)(struct seg6_mobile_lwt *a, struct seg6_mobile_lwt *b); + + /* optional destroy() callback to release resources acquired in + * the corresponding parse() function. + */ + void (*destroy)(struct seg6_mobile_lwt *slwt); +}; + +struct pcpu_seg6_mobile_counters { + u64_stats_t packets; + u64_stats_t bytes; + u64_stats_t errors; + + struct u64_stats_sync syncp; +}; + +/* User-space aggregate format for the per-CPU counters. Kept private + * to the kernel; userspace receives the values through SEG6_MOBILE_CNT_* + * nested netlink attributes. + */ +struct seg6_mobile_counters { + __u64 packets; + __u64 bytes; + __u64 errors; +}; + +#define seg6_mobile_alloc_pcpu_counters(__gfp) \ + __netdev_alloc_pcpu_stats(struct pcpu_seg6_mobile_counters, \ + ((__gfp) | __GFP_ZERO)) + +struct seg6_mobile_lwt { + int action; + struct in6_addr mapped_sid; + const struct seg6_mobile_action_desc *desc; + struct pcpu_seg6_mobile_counters __percpu *pcpu_counters; + + /* required attrs are tracked by desc->attrs; optional attrs that + * the user actually configured are tracked here so that fill_encap + * / cmp / destroy can iterate only over what was parsed. + */ + unsigned long parsed_optattrs; +}; + +static struct seg6_mobile_lwt *seg6_mobile_lwtunnel(struct lwtunnel_state = *lwt) +{ + return (struct seg6_mobile_lwt *)lwt->data; +} + +/* ABSENT is told apart from MALFORMED so that a behavior which accepts + * SRH-less packets still drops a malformed SRH + */ +enum seg6_mobile_srh_state { + SEG6_MOBILE_SRH_ABSENT, + SEG6_MOBILE_SRH_PRESENT, + SEG6_MOBILE_SRH_MALFORMED, +}; + +static struct ipv6_sr_hdr * +seg6_mobile_get_and_validate_srh(struct sk_buff *skb, + enum seg6_mobile_srh_state *state) +{ + struct ipv6_sr_hdr *srh; + unsigned int srhoff =3D 0; + int hdr_proto; + int flags =3D 0; + + srh =3D seg6_get_srh(skb, 0); + if (srh) { +#ifdef CONFIG_IPV6_SEG6_HMAC + if (!seg6_hmac_validate_skb(skb)) { + *state =3D SEG6_MOBILE_SRH_MALFORMED; + return NULL; + } +#endif + *state =3D SEG6_MOBILE_SRH_PRESENT; + return srh; + } + + hdr_proto =3D ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, &flags); + *state =3D hdr_proto =3D=3D -ENOENT ? SEG6_MOBILE_SRH_ABSENT + : SEG6_MOBILE_SRH_MALFORMED; + return NULL; +} + +static int seg6_mobile_l4_csum_hlen(u8 nexthdr) +{ + switch (nexthdr) { + case IPPROTO_TCP: + return sizeof(struct tcphdr); + case IPPROTO_UDP: + return sizeof(struct udphdr); + case IPPROTO_ICMPV6: + return sizeof(struct icmp6hdr); + } + return 0; +} + +static __sum16 *seg6_mobile_l4_csum(struct sk_buff *skb, int l4_off, + u8 nexthdr) +{ + switch (nexthdr) { + case IPPROTO_TCP: + return &((struct tcphdr *)(skb->data + l4_off))->check; + case IPPROTO_UDP: { + struct udphdr *uh =3D (struct udphdr *)(skb->data + l4_off); + + /* zero UDPv6 checksum on a non-offloaded skb means "none" */ + if (!uh->check && skb->ip_summed !=3D CHECKSUM_PARTIAL) + return NULL; + return &uh->check; + } + case IPPROTO_ICMPV6: + return &((struct icmp6hdr *)(skb->data + l4_off))->icmp6_cksum; + } + return NULL; +} + +/* rewrite DA; the L4 checksum follows only when the receiver will verify + * it against the new DA, i.e. no SRH is left for it to process + */ +static int seg6_mobile_advance_da(struct sk_buff *skb, + const struct in6_addr *nh, bool srh_present) +{ + int l4_off =3D 0, l4_hlen =3D 0; + struct in6_addr old_da; + struct ipv6hdr *ip6h; + __be16 frag_off; + u8 nexthdr =3D 0; + __sum16 *csum; + int write_len; + + if (!pskb_may_pull(skb, sizeof(*ip6h))) + return -EINVAL; + + ip6h =3D ipv6_hdr(skb); + write_len =3D sizeof(*ip6h); + + if (!srh_present) { + nexthdr =3D ip6h->nexthdr; + l4_off =3D ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, + &frag_off); + if (l4_off < 0) + return -EINVAL; + + /* only the first fragment carries the L4 header; frag_off + * is the raw field, M flag included + */ + if (!(frag_off & htons(IP6_OFFSET))) + l4_hlen =3D seg6_mobile_l4_csum_hlen(nexthdr); + if (l4_hlen) + write_len =3D l4_off + l4_hlen; + } + + if (skb_ensure_writable(skb, write_len)) + return -ENOMEM; + + /* skb_ensure_writable() may change skb pointers; evaluate ip6h again */ + ip6h =3D ipv6_hdr(skb); + old_da =3D ip6h->daddr; + + csum =3D l4_hlen ? seg6_mobile_l4_csum(skb, l4_off, nexthdr) : NULL; + if (csum) { + inet_proto_csum_replace16(csum, skb, old_da.s6_addr32, + nh->s6_addr32, true); + if (nexthdr =3D=3D IPPROTO_UDP && !*csum) + *csum =3D CSUM_MANGLED_0; + } else if (skb->ip_summed =3D=3D CHECKSUM_COMPLETE) { + /* no L4 patch, so skb->csum must track the DA change itself */ + update_csum_diff16(skb, old_da.s6_addr32, (__be32 *)nh); + } + + ip6h->daddr =3D *nh; + skb_clear_hash(skb); + + return 0; +} + +static int seg6_mobile_forward(struct sk_buff *skb) +{ + seg6_lookup_nexthop(skb, NULL, 0); + return dst_input(skb); +} + +/* replace DA with the mapped SID and forward, leaving the SRH untouched */ +static int input_action_end_map(struct sk_buff *skb, + struct seg6_mobile_lwt *slwt) +{ + enum seg6_mobile_srh_state srh_state; + struct ipv6_sr_hdr *srh; + + srh =3D seg6_mobile_get_and_validate_srh(skb, &srh_state); + if (srh_state =3D=3D SEG6_MOBILE_SRH_MALFORMED) + goto drop; + + /* SL =3D=3D 0: SRH spent, L4 is verified against the new DA */ + if (seg6_mobile_advance_da(skb, &slwt->mapped_sid, + srh && srh->segments_left)) + goto drop; + + return seg6_mobile_forward(skb); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +static int parse_nla_mapped_sid(struct nlattr **attrs, + struct seg6_mobile_lwt *slwt, + struct netlink_ext_ack *extack) +{ + memcpy(&slwt->mapped_sid, nla_data(attrs[SEG6_MOBILE_MAPPED_SID]), + sizeof(struct in6_addr)); + + return 0; +} + +static int put_nla_mapped_sid(struct sk_buff *skb, struct seg6_mobile_lwt = *slwt) +{ + if (nla_put_in6_addr(skb, SEG6_MOBILE_MAPPED_SID, &slwt->mapped_sid)) + return -EMSGSIZE; + + return 0; +} + +static int cmp_nla_mapped_sid(struct seg6_mobile_lwt *a, + struct seg6_mobile_lwt *b) +{ + return memcmp(&a->mapped_sid, &b->mapped_sid, sizeof(struct in6_addr)); +} + +static const struct +nla_policy seg6_mobile_counters_policy[SEG6_MOBILE_CNT_MAX + 1] =3D { + [SEG6_MOBILE_CNT_PACKETS] =3D { .type =3D NLA_U64 }, + [SEG6_MOBILE_CNT_BYTES] =3D { .type =3D NLA_U64 }, + [SEG6_MOBILE_CNT_ERRORS] =3D { .type =3D NLA_U64 }, +}; + +static int parse_nla_counters(struct nlattr **attrs, + struct seg6_mobile_lwt *slwt, + struct netlink_ext_ack *extack) +{ + struct pcpu_seg6_mobile_counters __percpu *pcounters; + struct nlattr *tb[SEG6_MOBILE_CNT_MAX + 1]; + int ret; + + ret =3D nla_parse_nested(tb, SEG6_MOBILE_CNT_MAX, + attrs[SEG6_MOBILE_COUNTERS], + seg6_mobile_counters_policy, extack); + if (ret < 0) + return ret; + + /* basic support for SRv6 Behavior counters requires at least: + * packets, bytes and errors. + */ + if (!tb[SEG6_MOBILE_CNT_PACKETS] || !tb[SEG6_MOBILE_CNT_BYTES] || + !tb[SEG6_MOBILE_CNT_ERRORS]) + return -EINVAL; + + /* counters are always zero initialized */ + pcounters =3D seg6_mobile_alloc_pcpu_counters(GFP_KERNEL); + if (!pcounters) + return -ENOMEM; + + slwt->pcpu_counters =3D pcounters; + + return 0; +} + +static int seg6_mobile_fill_nla_counters(struct sk_buff *skb, + struct seg6_mobile_counters *counters) +{ + if (nla_put_u64_64bit(skb, SEG6_MOBILE_CNT_PACKETS, counters->packets, + SEG6_MOBILE_CNT_PAD)) + return -EMSGSIZE; + + if (nla_put_u64_64bit(skb, SEG6_MOBILE_CNT_BYTES, counters->bytes, + SEG6_MOBILE_CNT_PAD)) + return -EMSGSIZE; + + if (nla_put_u64_64bit(skb, SEG6_MOBILE_CNT_ERRORS, counters->errors, + SEG6_MOBILE_CNT_PAD)) + return -EMSGSIZE; + + return 0; +} + +static int put_nla_counters(struct sk_buff *skb, struct seg6_mobile_lwt *s= lwt) +{ + struct seg6_mobile_counters counters =3D { 0, 0, 0 }; + struct nlattr *nest; + int rc, i; + + nest =3D nla_nest_start(skb, SEG6_MOBILE_COUNTERS); + if (!nest) + return -EMSGSIZE; + + for_each_possible_cpu(i) { + struct pcpu_seg6_mobile_counters *pcounters; + u64 packets, bytes, errors; + unsigned int start; + + pcounters =3D per_cpu_ptr(slwt->pcpu_counters, i); + do { + start =3D u64_stats_fetch_begin(&pcounters->syncp); + + packets =3D u64_stats_read(&pcounters->packets); + bytes =3D u64_stats_read(&pcounters->bytes); + errors =3D u64_stats_read(&pcounters->errors); + + } while (u64_stats_fetch_retry(&pcounters->syncp, start)); + + counters.packets +=3D packets; + counters.bytes +=3D bytes; + counters.errors +=3D errors; + } + + rc =3D seg6_mobile_fill_nla_counters(skb, &counters); + if (rc < 0) { + nla_nest_cancel(skb, nest); + return rc; + } + + return nla_nest_end(skb, nest); +} + +static int cmp_nla_counters(struct seg6_mobile_lwt *a, + struct seg6_mobile_lwt *b) +{ + /* tunnels with counters enabled and disabled are different. */ + return (!!((unsigned long)a->pcpu_counters)) ^ + (!!((unsigned long)b->pcpu_counters)); +} + +static void destroy_attr_counters(struct seg6_mobile_lwt *slwt) +{ + free_percpu(slwt->pcpu_counters); +} + +static const struct seg6_mobile_action_desc seg6_mobile_action_table[] =3D= { + { + .action =3D SEG6_MOBILE_ACTION_END_MAP, + .attrs =3D SEG6_MOBILE_F_ATTR(SEG6_MOBILE_MAPPED_SID), + .optattrs =3D SEG6_F_MOBILE_COUNTERS, + .input =3D input_action_end_map, + }, +}; + +static const struct seg6_mobile_action_param +seg6_mobile_action_params[SEG6_MOBILE_MAX + 1] =3D { + [SEG6_MOBILE_MAPPED_SID] =3D { + .parse =3D parse_nla_mapped_sid, + .put =3D put_nla_mapped_sid, + .cmp =3D cmp_nla_mapped_sid, + }, + [SEG6_MOBILE_COUNTERS] =3D { + .parse =3D parse_nla_counters, + .put =3D put_nla_counters, + .cmp =3D cmp_nla_counters, + .destroy =3D destroy_attr_counters, + }, +}; + +static const struct nla_policy +seg6_mobile_policy[SEG6_MOBILE_MAX + 1] =3D { + [SEG6_MOBILE_ACTION] =3D { .type =3D NLA_U32 }, + [SEG6_MOBILE_MAPPED_SID] =3D + NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), + [SEG6_MOBILE_COUNTERS] =3D { .type =3D NLA_NESTED }, +}; + +static const struct seg6_mobile_action_desc * +seg6_mobile_get_action_desc(int action) +{ + int i; + + for (i =3D 0; i < ARRAY_SIZE(seg6_mobile_action_table); i++) { + if (seg6_mobile_action_table[i].action =3D=3D action) + return &seg6_mobile_action_table[i]; + } + + return NULL; +} + +/* call the destroy() callback (if available) for each set attribute in + * @parsed_attrs, starting from the first attribute up to the @max_parsed + * (excluded) attribute. + */ +static void __destroy_attrs(unsigned long parsed_attrs, int max_parsed, + struct seg6_mobile_lwt *slwt) +{ + const struct seg6_mobile_action_param *param; + int i; + + for (i =3D SEG6_MOBILE_ACTION + 1; i < max_parsed; i++) { + if (!(parsed_attrs & SEG6_MOBILE_F_ATTR(i))) + continue; + + param =3D &seg6_mobile_action_params[i]; + if (param->destroy) + param->destroy(slwt); + } +} + +static void destroy_attrs(struct seg6_mobile_lwt *slwt) +{ + unsigned long attrs =3D slwt->desc->attrs | slwt->parsed_optattrs; + + __destroy_attrs(attrs, SEG6_MOBILE_MAX + 1, slwt); +} + +static int seg6_mobile_parse_attrs(struct nlattr **attrs, + struct seg6_mobile_lwt *slwt, + struct netlink_ext_ack *extack) +{ + const struct seg6_mobile_action_param *param; + const struct seg6_mobile_action_desc *desc; + unsigned long parsed_optattrs =3D 0; + int i, err; + + desc =3D slwt->desc; + + if (WARN_ON_ONCE(desc->attrs & desc->optattrs)) + return -EINVAL; + + for (i =3D SEG6_MOBILE_ACTION + 1; i <=3D SEG6_MOBILE_MAX; i++) { + bool required =3D desc->attrs & SEG6_MOBILE_F_ATTR(i); + bool optional =3D desc->optattrs & SEG6_MOBILE_F_ATTR(i); + + if (!required && !optional) + continue; + + if (required && !attrs[i]) { + NL_SET_ERR_MSG_MOD(extack, + "missing required attribute"); + err =3D -EINVAL; + goto err; + } + + if (!attrs[i]) + continue; + + param =3D &seg6_mobile_action_params[i]; + err =3D param->parse(attrs, slwt, extack); + if (err < 0) + goto err; + + if (optional) + parsed_optattrs |=3D SEG6_MOBILE_F_ATTR(i); + } + + slwt->parsed_optattrs =3D parsed_optattrs; + + return 0; + +err: + __destroy_attrs(desc->attrs | parsed_optattrs, i, slwt); + return err; +} + +static bool seg6_mobile_counters_enabled(struct seg6_mobile_lwt *slwt) +{ + return slwt->parsed_optattrs & SEG6_F_MOBILE_COUNTERS; +} + +static void seg6_mobile_update_counters(struct seg6_mobile_lwt *slwt, + unsigned int len, int err) +{ + struct pcpu_seg6_mobile_counters *pcounters; + + pcounters =3D this_cpu_ptr(slwt->pcpu_counters); + u64_stats_update_begin(&pcounters->syncp); + + if (likely(!err)) { + u64_stats_inc(&pcounters->packets); + u64_stats_add(&pcounters->bytes, len); + } else { + u64_stats_inc(&pcounters->errors); + } + + u64_stats_update_end(&pcounters->syncp); +} + +static int seg6_mobile_input(struct sk_buff *skb) +{ + struct dst_entry *orig_dst =3D skb_dst(skb); + struct seg6_mobile_lwt *slwt; + unsigned int len =3D skb->len; + int rc; + + if (skb->protocol !=3D htons(ETH_P_IPV6)) { + kfree_skb(skb); + return -EINVAL; + } + + slwt =3D seg6_mobile_lwtunnel(orig_dst->lwtstate); + + rc =3D slwt->desc->input(skb, slwt); + + if (seg6_mobile_counters_enabled(slwt)) + seg6_mobile_update_counters(slwt, len, rc); + + return rc; +} + +static int seg6_mobile_build_state(struct net *net, struct nlattr *nla, + unsigned int family, const void *cfg, + struct lwtunnel_state **ts, + struct netlink_ext_ack *extack) +{ + const struct seg6_mobile_action_desc *desc; + struct nlattr *tb[SEG6_MOBILE_MAX + 1]; + struct lwtunnel_state *newts; + struct seg6_mobile_lwt *slwt; + int err; + + if (family !=3D AF_INET6) + return -EINVAL; + + err =3D nla_parse_nested(tb, SEG6_MOBILE_MAX, nla, + seg6_mobile_policy, extack); + if (err < 0) + return err; + + if (!tb[SEG6_MOBILE_ACTION]) { + NL_SET_ERR_MSG_MOD(extack, "missing SEG6_MOBILE_ACTION"); + return -EINVAL; + } + + desc =3D seg6_mobile_get_action_desc(nla_get_u32(tb[SEG6_MOBILE_ACTION])); + if (!desc) { + NL_SET_ERR_MSG_MOD(extack, "unknown SRv6 Mobile action"); + return -EOPNOTSUPP; + } + + newts =3D lwtunnel_state_alloc(sizeof(*slwt)); + if (!newts) + return -ENOMEM; + + slwt =3D seg6_mobile_lwtunnel(newts); + slwt->action =3D desc->action; + slwt->desc =3D desc; + + err =3D seg6_mobile_parse_attrs(tb, slwt, extack); + if (err < 0) { + kfree(newts); + return err; + } + + newts->type =3D LWTUNNEL_ENCAP_SEG6_MOBILE; + newts->flags =3D LWTUNNEL_STATE_INPUT_REDIRECT; + + *ts =3D newts; + + return 0; +} + +static void seg6_mobile_destroy_state(struct lwtunnel_state *lwt) +{ + destroy_attrs(seg6_mobile_lwtunnel(lwt)); +} + +static int seg6_mobile_fill_encap(struct sk_buff *skb, + struct lwtunnel_state *lwt) +{ + struct seg6_mobile_lwt *slwt =3D seg6_mobile_lwtunnel(lwt); + const struct seg6_mobile_action_param *param; + unsigned long attrs; + int i, err; + + if (nla_put_u32(skb, SEG6_MOBILE_ACTION, slwt->action)) + return -EMSGSIZE; + + attrs =3D slwt->desc->attrs | slwt->parsed_optattrs; + for (i =3D SEG6_MOBILE_ACTION + 1; i <=3D SEG6_MOBILE_MAX; i++) { + if (!(attrs & SEG6_MOBILE_F_ATTR(i))) + continue; + + param =3D &seg6_mobile_action_params[i]; + err =3D param->put(skb, slwt); + if (err < 0) + return err; + } + + return 0; +} + +static int seg6_mobile_get_encap_size(struct lwtunnel_state *lwt) +{ + struct seg6_mobile_lwt *slwt =3D seg6_mobile_lwtunnel(lwt); + unsigned long attrs; + int nlsize; + + nlsize =3D nla_total_size(sizeof(u32)); /* SEG6_MOBILE_ACTION */ + + attrs =3D slwt->desc->attrs | slwt->parsed_optattrs; + if (attrs & SEG6_MOBILE_F_ATTR(SEG6_MOBILE_MAPPED_SID)) + nlsize +=3D nla_total_size(sizeof(struct in6_addr)); + + if (attrs & SEG6_F_MOBILE_COUNTERS) + nlsize +=3D nla_total_size(0) + /* nest SEG6_MOBILE_COUNTERS */ + /* SEG6_MOBILE_CNT_PACKETS */ + nla_total_size_64bit(sizeof(__u64)) + + /* SEG6_MOBILE_CNT_BYTES */ + nla_total_size_64bit(sizeof(__u64)) + + /* SEG6_MOBILE_CNT_ERRORS */ + nla_total_size_64bit(sizeof(__u64)); + + return nlsize; +} + +static int seg6_mobile_cmp_encap(struct lwtunnel_state *a, + struct lwtunnel_state *b) +{ + struct seg6_mobile_lwt *slwt_a =3D seg6_mobile_lwtunnel(a); + struct seg6_mobile_lwt *slwt_b =3D seg6_mobile_lwtunnel(b); + const struct seg6_mobile_action_param *param; + unsigned long attrs_a, attrs_b; + int i; + + if (slwt_a->action !=3D slwt_b->action) + return 1; + + attrs_a =3D slwt_a->desc->attrs | slwt_a->parsed_optattrs; + attrs_b =3D slwt_b->desc->attrs | slwt_b->parsed_optattrs; + + if (attrs_a !=3D attrs_b) + return 1; + + for (i =3D SEG6_MOBILE_ACTION + 1; i <=3D SEG6_MOBILE_MAX; i++) { + if (!(attrs_a & SEG6_MOBILE_F_ATTR(i))) + continue; + + param =3D &seg6_mobile_action_params[i]; + if (param->cmp(slwt_a, slwt_b)) + return 1; + } + + return 0; +} + +static const struct lwtunnel_encap_ops seg6_mobile_ops =3D { + .build_state =3D seg6_mobile_build_state, + .destroy_state =3D seg6_mobile_destroy_state, + .input =3D seg6_mobile_input, + .fill_encap =3D seg6_mobile_fill_encap, + .get_encap_size =3D seg6_mobile_get_encap_size, + .cmp_encap =3D seg6_mobile_cmp_encap, + .owner =3D THIS_MODULE, +}; + +int __init seg6_mobile_init(void) +{ + BUILD_BUG_ON(SEG6_MOBILE_MAX + 1 > BITS_PER_TYPE(unsigned long)); + + return lwtunnel_encap_add_ops(&seg6_mobile_ops, + LWTUNNEL_ENCAP_SEG6_MOBILE); +} + +void seg6_mobile_exit(void) +{ + lwtunnel_encap_del_ops(&seg6_mobile_ops, LWTUNNEL_ENCAP_SEG6_MOBILE); +} --=20 2.50.1 From nobody Sat Sep 26 13:47:36 2026 Received: from mail-pz2-f12.google.com (mail-pz2-f12.google.com [74.125.228.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A6B133C2786 for ; Fri, 25 Sep 2026 06:03:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.228.12 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790316198; cv=none; b=k80YGGrzYHfr4WEAkZLFOqjORvpZ2CfQP0PKpTnVfvMTI2HuCE6Jofj7iM00NlZwDPV+sBU7rjLnvYYp/0bvMHfhwkMihnVIM+J7oIWG+uwEIlYLawdPMgaco/aCvRMiuqwolUVWYEFGNQWthQbUViCMkkr1yxscncfGB0Jn86E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790316198; c=relaxed/simple; bh=ICzei5NI8gONyTHgC0h3eds1f/0r7oe5+eBpDJdW808=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=nzoqpIxY5eyO0sDCZGSVqYtaHu3jQqlEFJFoDocyuglKKSyYBH6X4axeAj4jLlqE9i3630FPjqU08e4gCpsUhPZFY6sytIJ1nesye4bKYVcWITZw84IkKReUAJNj+EtBPjCpgAY7ZHZ4k/qVP3lXLuwwggffJT5xivoXpCDOcpc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=sz1C6LYd; arc=none smtp.client-ip=74.125.228.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="sz1C6LYd" Received: by mail-pz2-f12.google.com with SMTP id 41be03b00d2f7-cc4aa0f1766so273456a12.0 for ; Thu, 24 Sep 2026 23:03:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790316195; x=1790920995; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=UYrgpq97EyvwU46bOtUZUUbred5gFZgXZ9QLzv5at9s=; b=sz1C6LYdvzXi0qPmLsm6a8/PHqPOJi6SNMvARyu+9FURH4cjf3/kGJ2BsT5L0fgtNO gpkIaWrwJxBZLjRgeaDQKKt3EMwXg1dNNf8mYdgdgVGCDSxVTHyUB5I7XMVUC3twK7M3 QpcMNayqs0lHDNBKq6/lyBoAkWClok9iHNi/PA9TzFPP0VDGfzYLSRm/mndn/NR3SjT2 jG+4BzmgURC1bgCF3gWDxa7OLS75FoCCwLU++5zzeYdVP/Bi38knkrkZ79nVWAIIM16K 59FQNPYp8SY1NnXRqNVMiwuqQqPB85tFbnIy843twKZGYkGO8nrsrxjMw2uKOeWj95S0 DntQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790316195; x=1790920995; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=UYrgpq97EyvwU46bOtUZUUbred5gFZgXZ9QLzv5at9s=; b=SIHjkgEqQgZRpW1EU6rHMnAJIJqo67CX8WXMUSafo2kR9T3xRzXShyS+/zjm/68RZI HE4exoJLS1FOgLtgQb5LYuKgd84/f2QVj98E2HskrWFQwK48PZUom3AXSjwHo95FyWiM ONePgpNoAq5Ggh93waV3HdWsavVA20PZCHvPPb23wiVG8wYOKaoo9z6BTISBqcRAeOoE sJpzx25C4tO+QmWqOZbcJJxKEpJR2z2y1/AZEFg9ucOyX0HlAo8SYxjmbCY20Hs52Sue VAJNI6RU2Z9ILMfaaQvmFWMY2NRxJOLwAU5AlLDwkA27bDJNScDhCWy5hT2h/as8VNDy uE/A== X-Forwarded-Encrypted: i=1; AKwUvByLMgsgg0Q8DsIss+6vIX1cUgZehpcgxDK+iqbRZI7o6BrJx21LQCY4PVuqLMvZYmer4aMENTvRbp8Htbg=@vger.kernel.org X-Gm-Message-State: AFuF++kp3FF3qQGUl+jvNsXJI4w/KJdIjeH1CQKJbYCb3hHD7q5tzbAW VIl9ao081/LbDKKROEty4dEqVF55oimFe6b/B5VOXaqad7p/EpHvocvk X-Gm-Gg: AYBFou0z/x+46UB8YFq7zb7Q2RYTNU+xemqSVuT+K4g4rY1pBinGncCB75UFUJKi+OK tagOBCvwnWXN/8KsYIHZrvwkoidG1upKwBPTCZYp1XU59Eee3iFMC1RbYxCdZEWxW9sqJKrgsWb mtL01p+LCIiNBdBJcwbfhNkDKh2UmguzLEuxkRWugiZyjaDUT37IKCscBWERPsFd88x1+3+vaZ9 6Lg6gj/wyYyTWNvXykPb29gi8sA97VkhAD9TMChpdAK8DGFuHZfCHxKy4QlyqeeEiKPpTq6YuWq gQXzmotBKuITFsBE0euFAe4rZbz3PqMBpdF0FQLmsRAK/yHmL+dmKh2WW1yYtDGEkSN/tMN5kZu G115IwO4USzN27Mhg5BhNATjWnpl5x9FEh/4TWaqLNauK5gYjYXpoicx21d5jVIcmw7aF6lWzAl FwdU/lNwbkBNXp3Wee375VqEPn42XIWki64jbJJW7HClnK/5XRURvG+ztP4eWGAE0KeDDkQuOCi gulrdCL X-Received: by 2002:a05:6a21:b96:b0:3dd:a007:cb2c with SMTP id adf61e73a8af0-3de26db48a0mr1214304637.40.1790316194833; Thu, 24 Sep 2026 23:03:14 -0700 (PDT) Received: from [163.43.103.131] ([163.43.103.131]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc78795dd54sm645963a12.30.2026.09.24.23.03.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2026 23:03:14 -0700 (PDT) From: Yuya Kusakabe Date: Fri, 25 Sep 2026 15:03:04 +0900 Subject: [PATCH RFC net-next v4 2/2] selftests: seg6: add selftest for End.MAP behavior Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260925-seg6-mobile-end-map-v4-2-457733c08586@gmail.com> References: <20260925-seg6-mobile-end-map-v4-0-457733c08586@gmail.com> In-Reply-To: <20260925-seg6-mobile-end-map-v4-0-457733c08586@gmail.com> To: Andrea Mayer , Andrea Mayer , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , David Ahern , Ido Schimmel , Shuah Khan Cc: Justin Iurman , Florian Westphal , Fernando Fernandez Mancera , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Yuya Kusakabe X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=22157; i=yuya.kusakabe@gmail.com; h=from:subject:message-id; bh=ICzei5NI8gONyTHgC0h3eds1f/0r7oe5+eBpDJdW808=; b=owEBbQKS/ZANAwAIASrX0XUqXRtNAcsmYgBqtg6Ys+VYJSJI29TYo9lde2ayf/TcWEz/5ntpz pkho//Fo5+JAjMEAAEIAB0WIQTaB7usAfxNKMeqa6Yq19F1Kl0bTQUCarYOmAAKCRAq19F1Kl0b TR8JD/9hk817N/Us4QtA1S3ybbdVJFs7mJp8BbMBY2SJ3TeCc6qgz/m/UKQlT/2/N2HCWxCfESr d4xLu+6yZ7+tWlvpfuHy/kPbT2VUGbsAlrfB2yUTwpSfQ/q2+P2qR/AD+2Sf77spr138bPrhY8q Y0zHe8/lqJis+9r4wiMHB3FaX+UOBMjOOuB+DCG8PsXr4geFHnxrfsk1a5f5jkN0RPPF5DKdvu2 4erO3o+Jts4sQ+K6Mg6VHHQDuqAVGwfwNQwIXya5/t88NNUlfYEqlg2A4bMiGPgK4weMCKB3xXm cHWsIFzKRCJ62Wc9ZjCSrAf6+6bqYWFhEonrD2XlQHzApy1IJCw9mCD0xBhvWQiT7r4pdjhXiw4 EQBZLM8yfSLjl3ph48OJuyLfRaUbepLdrkJbnPFclEVBZmTJayzgn578ImD3z5rURRE+ufpzOBn n3lriHquf2Lnvwrm6sSPXb72C7+3OHVqTjnzpPLdAvhJK6VIIIac45piyofhOa31cEMWsXK+Kpf +9feFTEuGcKopnaoiOT4a9CGsRreNVbud2VY4+b9fXBIU7+J6Ie34kaYrtFdDAneYSS7vUV32Ph 9+KfN8qTBU+AgNYENNMrXEnyVp8dCo04+kjFyKpVeseRZvQfRSt22xFcgzszFfZiX5BCUh9D759 Clp06s5iLNJmuYg== X-Developer-Key: i=yuya.kusakabe@gmail.com; a=openpgp; fpr=DA07BBAC01FC4D28C7AA6BA62AD7D1752A5D1B4D This selftest is designed for testing the SRv6 End.MAP behavior. It instantiates three network namespaces interconnected through veth pairs, with the middle one running End.MAP; the topology and the cases are described in the script header. The correct execution of the behavior is verified through ICMPv6 echo reachability with and without an SRH, asserting that the receiver counts no transport checksum errors, and through the route's own error counter for the packets End.MAP must drop. A small C helper, srv6_mobile_send, crafts the routing headers the standard tools cannot produce. Assisted-by: LLM Signed-off-by: Yuya Kusakabe --- tools/testing/selftests/net/.gitignore | 1 + tools/testing/selftests/net/Makefile | 2 + tools/testing/selftests/net/config | 1 + tools/testing/selftests/net/srv6_end_map_test.sh | 400 +++++++++++++++++++= ++++ tools/testing/selftests/net/srv6_mobile_send.c | 262 +++++++++++++++ 5 files changed, 666 insertions(+) diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftes= ts/net/.gitignore index c9f46031ac73..9afff0d83dde 100644 --- a/tools/testing/selftests/net/.gitignore +++ b/tools/testing/selftests/net/.gitignore @@ -42,6 +42,7 @@ socket so_incoming_cpu so_netns_cookie so_rcv_listener +srv6_mobile_send stress_reuseport_listen tap tcp_fastopen_backup_key diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests= /net/Makefile index 3ee3378f8b26..105e0f507791 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -96,6 +96,7 @@ TEST_PROGS :=3D \ srv6_end_dx4_netfilter_test.sh \ srv6_end_dx6_netfilter_test.sh \ srv6_end_flavors_test.sh \ + srv6_end_map_test.sh \ srv6_end_next_csid_l3vpn_test.sh \ srv6_end_x_next_csid_l3vpn_test.sh \ srv6_hencap_red_l3vpn_test.sh \ @@ -165,6 +166,7 @@ TEST_GEN_FILES :=3D \ so_netns_cookie \ so_rcv_listener \ socket \ + srv6_mobile_send \ stress_reuseport_listen \ tcp_fastopen_backup_key \ tcp_inq \ diff --git a/tools/testing/selftests/net/config b/tools/testing/selftests/n= et/config index 737e7e6327b3..abdc585a325e 100644 --- a/tools/testing/selftests/net/config +++ b/tools/testing/selftests/net/config @@ -49,6 +49,7 @@ CONFIG_IPV6_ROUTE_INFO=3Dy CONFIG_IPV6_ROUTER_PREF=3Dy CONFIG_IPV6_RPL_LWTUNNEL=3Dy CONFIG_IPV6_SEG6_LWTUNNEL=3Dy +CONFIG_IPV6_SEG6_MOBILE=3Dy CONFIG_IPV6_SIT=3Dy CONFIG_IPV6_VTI=3Dy CONFIG_IPVLAN=3Dm diff --git a/tools/testing/selftests/net/srv6_end_map_test.sh b/tools/testi= ng/selftests/net/srv6_end_map_test.sh new file mode 100755 index 000000000000..a4efcb58a1e4 --- /dev/null +++ b/tools/testing/selftests/net/srv6_end_map_test.sh @@ -0,0 +1,400 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# author: Yuya Kusakabe + +# Selftest for the SRv6 End.MAP behavior (RFC 9433). +# +# +------+ 2001:db8:1::/64 +------+ 2001:db8:2::/64 +------+ +# | rt-1 | --------------------- | rt-2 | --------------------- | rt-3 | +# +------+ veth1 +------+ veth2 +------+ +# (End.MAP) +# +# rt-2 holds the End.MAP route for 2001:db8:f::/64 that replaces the +# IPv6 destination with 2001:db8:3::3 (an address on rt-3's loopback, +# also used as the final SRv6 segment in the H.Encaps scenario). +# +# The original destination 2001:db8:f::1 and the replacement +# 2001:db8:3::3 have different 16-bit word sums, so any regression in +# the transport-checksum diff update would corrupt the ICMPv6 +# checksum and bump Icmp6InCsumErrors -- the forwarding cases assert +# that the counter does not move. +# +# Eight cases are exercised: +# +# 1. SRH absent -- plain ICMPv6 echo to the End.MAP SID. +# 2. SRH present -- the destination is reached through an +# H.Encaps wrapper that carries an SRH with +# two segments; End.MAP must leave the SRH +# structurally intact. +# 3. SRH inline -- the destination is reached through an +# H.Insert wrapper that inserts an SRH whose +# first hop is the End.MAP SID; End.MAP must +# NOT patch the L4 checksum, because the +# receiver's SRv6 processing restores the +# destination from segments[0] before the +# ICMPv6 handler verifies it. +# 4. RH not an SRH -- a C helper sends a packet whose Routing +# Header is type 0 rather than 4; End.MAP must +# drop it. The behavior's own errors counter +# binds the assertion to the drop. +# 5. SRH malformed -- the helper sends an SRH whose Last Entry +# exceeds its length; End.MAP must drop it. +# 6. SRH exhausted -- the helper sends a valid SRH with Segments +# Left 0, so the IPv6 DA already is the final +# destination; End.MAP must patch the L4 +# checksum as in the SRH-absent case and the +# receiver must accept the echo. +# 7. Fragmented -- an oversized echo without an SRH is fragmented +# by rt-1; only the first fragment carries the +# ICMPv6 header, and End.MAP must patch its +# checksum so the reassembled echo verifies at +# rt-3. +# 8. Hop Limit -- an echo whose Hop Limit is 1 on arrival at +# the End.MAP node must yield an ICMPv6 Time +# Exceeded from that node, confirming Hop Limit +# handling is delegated to the ip6_forward path. + +source lib.sh + +readonly PING_TIMEOUT_SEC=3D4 +readonly COUNTER_TIMEOUT_SEC=3D2 +readonly END_MAP_PREFIX=3D"2001:db8:f::/64" +readonly END_MAP_SID=3D"2001:db8:f::1" +readonly RT3_SID=3D"2001:db8:3::3" +HELPER_DIR=3D$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd) +readonly HELPER_DIR +readonly HELPER=3D"${HELPER_DIR}/srv6_mobile_send" + +ret=3D0 +nsuccess=3D0 +nfail=3D0 + +PAUSE_ON_FAIL=3D${PAUSE_ON_FAIL:=3Dno} + +log_test() +{ + local rc=3D$1 + local expected=3D$2 + local msg=3D"$3" + + if [ "${rc}" -eq "${expected}" ]; then + nsuccess=3D$((nsuccess + 1)) + printf "\n TEST: %-60s [ OK ]\n" "${msg}" + else + ret=3D1 + nfail=3D$((nfail + 1)) + printf "\n TEST: %-60s [FAIL]\n" "${msg}" + if [ "${PAUSE_ON_FAIL}" =3D "yes" ]; then + echo + echo "hit enter to continue, 'q' to quit" + read -r a + [ "$a" =3D "q" ] && exit 1 + fi + fi +} + +print_log_test_results() +{ + printf "\nTests passed: %3d\n" "${nsuccess}" + printf "Tests failed: %3d\n" "${nfail}" +} + +cleanup() +{ + cleanup_all_ns +} + +trap cleanup EXIT + +check_dependencies() +{ + if [ "$(id -u)" -ne 0 ]; then + echo "SKIP: need root privileges" + exit "${ksft_skip}" + fi + + for cmd in ip ping nstat sysctl ethtool; do + if ! command -v "$cmd" >/dev/null; then + echo "SKIP: ${cmd} is required" + exit "${ksft_skip}" + fi + done + + if [ ! -x "${HELPER}" ]; then + echo "SKIP: ${HELPER} not built" + exit "${ksft_skip}" + fi + + if ! ip route help 2>&1 | grep -qF "seg6mobile"; then + echo "SKIP: iproute2 lacks seg6mobile support" + exit "${ksft_skip}" + fi + + if ! ip route help 2>&1 | grep -qF "End.MAP"; then + echo "SKIP: iproute2 lacks End.MAP action" + exit "${ksft_skip}" + fi +} + +setup() +{ + setup_ns rt1 rt2 rt3 + + # shellcheck disable=3DSC2154 # variables assigned by setup_ns + for ns in "$rt1" "$rt2" "$rt3"; do + ip -n "$ns" link set lo up + done + + ip link add veth1 netns "$rt1" \ + type veth peer name veth1-rt2 netns "$rt2" + ip link add veth2 netns "$rt2" \ + type veth peer name veth2-rt3 netns "$rt3" + + ip -n "$rt1" addr add 2001:db8:1::1/64 dev veth1 nodad + ip -n "$rt2" addr add 2001:db8:1::2/64 dev veth1-rt2 nodad + ip -n "$rt2" addr add 2001:db8:2::1/64 dev veth2 nodad + ip -n "$rt3" addr add 2001:db8:2::2/64 dev veth2-rt3 nodad + # rt-3 also owns the End.MAP replacement SID / SRH endpoint. + ip -n "$rt3" addr add "$RT3_SID/128" dev lo nodad + + ip -n "$rt1" link set veth1 up + ip -n "$rt2" link set veth1-rt2 up + ip -n "$rt2" link set veth2 up + ip -n "$rt3" link set veth2-rt3 up + + ip netns exec "$rt2" sysctl -wq net.ipv6.conf.all.forwarding=3D1 + + # rt-3 must accept SRv6 packets so ipv6_srh_rcv lets the + # extension header chain through to local delivery. + ip netns exec "$rt3" sysctl -wq net.ipv6.conf.all.seg6_enabled=3D1 + ip netns exec "$rt3" \ + sysctl -wq net.ipv6.conf.veth2-rt3.seg6_enabled=3D1 + ip netns exec "$rt3" sysctl -wq net.ipv6.conf.lo.seg6_enabled=3D1 + + # Disable HW checksum offload so the kernel software checksum + # path runs unconditionally and any csum bug surfaces. + ip netns exec "$rt1" ethtool -K veth1 tx off rx off + ip netns exec "$rt2" ethtool -K veth1-rt2 tx off rx off + ip netns exec "$rt2" ethtool -K veth2 tx off rx off + ip netns exec "$rt3" ethtool -K veth2-rt3 tx off rx off + + # rt-1: route the End.MAP locator into rt-2. + ip -n "$rt1" -6 route add "$END_MAP_PREFIX" via 2001:db8:1::2 + + # rt-1: a separate H.Encaps route for the SRH-present scenario, + # wrapping the inner ICMPv6 echo in an outer IPv6+SRH carrying + # [End.MAP_SID, RT3_SID]. + ip -n "$rt1" -6 route add "$RT3_SID/128" via 2001:db8:1::2 \ + encap seg6 mode encap \ + segs "$END_MAP_SID","$RT3_SID" \ + dev veth1 + + # rt-2: End.MAP -- swap DA from the End.MAP SID to RT3_SID + # (an address on rt-3) and forward via the IPv6 FIB. "count" + # enables the per-behavior counters the drop tests read. + ip -n "$rt2" -6 route add "$END_MAP_PREFIX" \ + encap seg6mobile action End.MAP mapped_sid "$RT3_SID" count \ + dev veth2 + + # rt-2: reach RT3_SID (on rt-3's loopback) through the + # directly connected neighbour 2001:db8:2::2. + ip -n "$rt2" -6 route add "$RT3_SID/128" via 2001:db8:2::2 + + # rt-3: return route for the ICMPv6 echo reply. + ip -n "$rt3" -6 route add 2001:db8:1::/64 via 2001:db8:2::1 +} + +read_nstat_counter() +{ + local ns=3D$1 + local name=3D$2 + + # nstat -az reports a counter that has never incremented as 0, + # which is what we rely on for a clean before/after delta. + ip netns exec "$ns" nstat -az "$name" \ + | awk -v n=3D"$name" '$1 =3D=3D n {print $2}' +} + +read_route_errors() +{ + # The End.MAP route carries "count", so its errors counter + # increments once for every packet the behavior drops. Reading it + # binds the negative test to the drop itself rather than to any + # unrelated loss on the path to rt-3. + ip -n "$rt2" -j -s -6 route show "$END_MAP_PREFIX" \ + | grep -oE '"errors":[0-9]+' | grep -oE '[0-9]+' +} + +test_srh_absent() +{ + local before after rc=3D0 + + before=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + + if ! ip netns exec "$rt1" \ + ping -6 -c 1 -W "$PING_TIMEOUT_SEC" "$END_MAP_SID" \ + >/dev/null 2>&1; then + rc=3D1 + fi + + if [ "$rc" -eq 0 ]; then + after=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + [ "$before" !=3D "$after" ] && rc=3D1 + fi + + log_test "$rc" 0 "End.MAP forwards an ICMPv6 echo without an SRH" +} + +test_srh_present() +{ + local before after rc=3D0 + + before=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + + if ! ip netns exec "$rt1" \ + ping -6 -c 1 -W "$PING_TIMEOUT_SEC" "$RT3_SID" \ + >/dev/null 2>&1; then + rc=3D1 + fi + + if [ "$rc" -eq 0 ]; then + after=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + [ "$before" !=3D "$after" ] && rc=3D1 + fi + + log_test "$rc" 0 "End.MAP preserves an SRH carried by H.Encaps" +} + +test_srh_inline() +{ + local before after rc=3D0 + + ip -n "$rt1" -6 route add 2001:db8:2::2/128 via 2001:db8:1::2 \ + encap seg6 mode inline segs "$END_MAP_SID" \ + dev veth1 + + before=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + + if ! ip netns exec "$rt1" \ + ping -6 -c 1 -W "$PING_TIMEOUT_SEC" 2001:db8:2::2 \ + >/dev/null 2>&1; then + rc=3D1 + fi + + if [ "$rc" -eq 0 ]; then + after=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + [ "$before" !=3D "$after" ] && rc=3D1 + fi + + log_test "$rc" 0 "End.MAP preserves L4 csum across mode inline SRH" +} + +# The drop happens on rt-2's receive path, asynchronously to the +# sender, so wait for the errors counter instead of sampling it. +expect_end_map_drop() +{ + local before rc=3D0 + + before=3D$(read_route_errors) + + ip netns exec "$rt1" "$HELPER" -m end-map "$@" \ + -s 2001:db8:1::1 -d "$END_MAP_SID" >/dev/null 2>&1 + + slowwait "$COUNTER_TIMEOUT_SEC" until_counter_is ">=3D $((before + 1))" \ + read_route_errors >/dev/null || rc=3D1 + [ "$(read_route_errors)" -eq "$((before + 1))" ] || rc=3D1 + + echo "$rc" +} + +test_rh_not_srh() +{ + local rc + + rc=3D$(expect_end_map_drop --rh-type 0) + log_test "$rc" 0 "End.MAP drops a routing header that is not an SRH" +} + +test_srh_malformed() +{ + local rc + + rc=3D$(expect_end_map_drop --bad-srh) + log_test "$rc" 0 "End.MAP drops a malformed SRH" +} + +test_srh_exhausted() +{ + local before_echos before_csum rc=3D0 + + before_echos=3D$(read_nstat_counter "$rt3" Icmp6InEchos) + before_csum=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + + ip netns exec "$rt1" "$HELPER" -m end-map \ + -s 2001:db8:1::1 -d "$END_MAP_SID" >/dev/null 2>&1 + + slowwait "$COUNTER_TIMEOUT_SEC" \ + until_counter_is ">=3D $((before_echos + 1))" \ + read_nstat_counter "$rt3" Icmp6InEchos >/dev/null || rc=3D1 + [ "$(read_nstat_counter "$rt3" Icmp6InCsumErrors)" -eq \ + "$before_csum" ] || rc=3D1 + + log_test "$rc" 0 "End.MAP patches the L4 csum of an exhausted SRH" +} + +test_fragmented() +{ + local before after rc=3D0 + + before=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + + if ! ip netns exec "$rt1" \ + ping -6 -c 1 -s 2000 -M dont -W "$PING_TIMEOUT_SEC" \ + "$END_MAP_SID" >/dev/null 2>&1; then + rc=3D1 + fi + + if [ "$rc" -eq 0 ]; then + after=3D$(read_nstat_counter "$rt3" Icmp6InCsumErrors) + [ "$before" !=3D "$after" ] && rc=3D1 + fi + + log_test "$rc" 0 "End.MAP patches the L4 csum of a fragmented echo" +} + +test_hoplimit_expiry() +{ + local before after rc=3D0 + + before=3D$(read_nstat_counter "$rt2" Icmp6OutTimeExcds) + + ip netns exec "$rt1" \ + ping -6 -c 1 -t 1 -W "$PING_TIMEOUT_SEC" "$END_MAP_SID" \ + >/dev/null 2>&1 + + after=3D$(read_nstat_counter "$rt2" Icmp6OutTimeExcds) + [ "$((after - before))" -eq 1 ] || rc=3D1 + + log_test "$rc" 0 "End.MAP delegates Hop Limit expiry to ip6_forward" +} + +main() +{ + check_dependencies + setup + + test_srh_absent + test_srh_present + test_srh_inline + test_rh_not_srh + test_srh_malformed + test_srh_exhausted + test_fragmented + test_hoplimit_expiry + + print_log_test_results + exit "${ret}" +} + +main "$@" diff --git a/tools/testing/selftests/net/srv6_mobile_send.c b/tools/testing= /selftests/net/srv6_mobile_send.c new file mode 100644 index 000000000000..01329ec61676 --- /dev/null +++ b/tools/testing/selftests/net/srv6_mobile_send.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author: Yuya Kusakabe (yuya.kusakabe@gmail.com) + * + * Helper for SRv6 Mobile (RFC 9433) selftests. + * + * Usage: + * srv6_mobile_send -m end-map -s -d [--rh-type N] [--bad-sr= h] + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* RFC 8200 Routing header common fields are 4 bytes; an additional + * 4 bytes of type-specific data follow (the Reserved field for the + * deprecated type 0, or first_segment/flags/tag for SRH type 4). The + * segment list then runs in 16-byte units, giving a total of 24 bytes + * for one segment -- which is what ip6r_len =3D 2 advertises. + */ +struct srh_one_seg { + struct ip6_rthdr rthdr; + uint32_t type_data; + struct in6_addr segment; +}; + +/* Built as a struct so the headers are written through typed, aligned + * members rather than casts of a byte array; static_assert keeps it + * exactly the on-wire layout. + */ +struct end_map_frame { + struct ip6_hdr ip6; + struct srh_one_seg srh; + struct icmp6_hdr icmp6; +}; + +static_assert(sizeof(struct end_map_frame) =3D=3D + sizeof(struct ip6_hdr) + sizeof(struct srh_one_seg) + + sizeof(struct icmp6_hdr), + "end_map_frame must not contain padding"); + +enum mode { + MODE_NONE, + MODE_END_MAP, +}; + +struct cfg { + enum mode mode; + struct in6_addr src6; + struct in6_addr dst6; + uint8_t rh_type; + bool bad_srh; +}; + +static void usage(const char *bin) +{ + fprintf(stderr, + "Usage: %s -m -s -d [opts]\n" + "\n" + "Modes:\n" + " end-map Send IPv6 + SRH + ICMPv6 echo for End.MAP testing\n" + "\n" + "Mode end-map options:\n" + " --rh-type Routing Header type (default 4, the SRH)\n" + " --bad-srh emit an SRH whose Last Entry exceeds its length (= drop test)\n" + "\n" + "Exit: 0 sent, 1 failure, 3 invalid arguments.\n", + bin); +} + +static int parse_u32(const char *s, uint32_t *out) +{ + unsigned long v; + char *end; + + errno =3D 0; + v =3D strtoul(s, &end, 0); + if (errno || !*s || *end || v > 0xffffffffUL) + return -1; + *out =3D (uint32_t)v; + return 0; +} + +static int parse_u8(const char *s, uint8_t *out) +{ + uint32_t v; + + if (parse_u32(s, &v) || v > 0xff) + return -1; + *out =3D (uint8_t)v; + return 0; +} + +static enum mode parse_mode(const char *s) +{ + if (!strcmp(s, "end-map")) + return MODE_END_MAP; + return MODE_NONE; +} + +static int parse_args(int argc, char **argv, struct cfg *cfg) +{ + enum { OPT_RH_TYPE =3D 256, OPT_BAD_SRH }; + static const struct option longopts[] =3D { + { "rh-type", required_argument, NULL, OPT_RH_TYPE }, + { "bad-srh", no_argument, NULL, OPT_BAD_SRH }, + { NULL, 0, NULL, 0 }, + }; + int c; + + cfg->rh_type =3D 4; /* RFC 8754: the SRH is Routing Header type 4 */ + while ((c =3D getopt_long(argc, argv, "m:s:d:", longopts, NULL)) + !=3D -1) { + switch (c) { + case 'm': + cfg->mode =3D parse_mode(optarg); + break; + case 's': + if (inet_pton(AF_INET6, optarg, &cfg->src6) !=3D 1) + return -1; + break; + case 'd': + if (inet_pton(AF_INET6, optarg, &cfg->dst6) !=3D 1) + return -1; + break; + case OPT_RH_TYPE: + if (parse_u8(optarg, &cfg->rh_type)) + return -1; + break; + case OPT_BAD_SRH: + cfg->bad_srh =3D true; + break; + default: + return -1; + } + } + if (cfg->mode =3D=3D MODE_NONE) + return -1; + return 0; +} + +static uint16_t csum_fold(uint32_t sum) +{ + while (sum >> 16) + sum =3D (sum & 0xffff) + (sum >> 16); + return ~sum; +} + +static uint32_t csum_partial(const void *buf, size_t len, uint32_t sum) +{ + const uint8_t *p =3D buf; + uint16_t word; + + while (len > 1) { + memcpy(&word, p, sizeof(word)); + sum +=3D word; + p +=3D sizeof(word); + len -=3D sizeof(word); + } + if (len) + sum +=3D *p; + return sum; +} + +static uint16_t pseudo_csum(const struct in6_addr *src, + const struct in6_addr *dst, + uint32_t plen, uint8_t nexthdr, + const void *payload, size_t len) +{ + uint32_t nh =3D htonl(nexthdr); + uint32_t pl =3D htonl(plen); + uint32_t sum; + + sum =3D csum_partial(src, sizeof(*src), 0); + sum =3D csum_partial(dst, sizeof(*dst), sum); + sum =3D csum_partial(&pl, sizeof(pl), sum); + sum =3D csum_partial(&nh, sizeof(nh), sum); + sum =3D csum_partial(payload, len, sum); + return csum_fold(sum); +} + +static int send_end_map(const struct cfg *cfg) +{ + struct sockaddr_in6 dst_addr =3D { .sin6_family =3D AF_INET6 }; + struct end_map_frame frame =3D {}; + ssize_t res; + int fd; + + frame.ip6.ip6_flow =3D htonl(6u << 28); + frame.ip6.ip6_plen =3D htons(sizeof(frame.srh) + sizeof(frame.icmp6)); + frame.ip6.ip6_nxt =3D IPPROTO_ROUTING; + frame.ip6.ip6_hops =3D 64; + frame.ip6.ip6_src =3D cfg->src6; + frame.ip6.ip6_dst =3D cfg->dst6; + + frame.srh.rthdr.ip6r_nxt =3D IPPROTO_ICMPV6; + frame.srh.rthdr.ip6r_len =3D 2; /* (1 + ip6r_len) * 8 =3D 24 */ + frame.srh.rthdr.ip6r_type =3D cfg->rh_type; + frame.srh.rthdr.ip6r_segleft =3D 0; + /* SRH Last Entry is the high byte of the type-specific word. A + * single segment makes it 0; --bad-srh claims a second segment the + * header has no room for, which seg6_validate_srh() rejects. + */ + frame.srh.type_data =3D htonl((uint32_t)(cfg->bad_srh ? 1 : 0) << 24); + frame.srh.segment =3D frame.ip6.ip6_dst; + + frame.icmp6.icmp6_type =3D ICMP6_ECHO_REQUEST; + frame.icmp6.icmp6_code =3D 0; + frame.icmp6.icmp6_dataun.icmp6_un_data16[0] =3D htons(0x1234); + frame.icmp6.icmp6_dataun.icmp6_un_data16[1] =3D htons(1); + frame.icmp6.icmp6_cksum =3D pseudo_csum(&frame.ip6.ip6_src, + &frame.ip6.ip6_dst, + sizeof(frame.icmp6), + IPPROTO_ICMPV6, &frame.icmp6, + sizeof(frame.icmp6)); + + fd =3D socket(AF_INET6, SOCK_RAW, IPPROTO_RAW); + if (fd < 0) { + perror("socket"); + return 1; + } + dst_addr.sin6_addr =3D frame.ip6.ip6_dst; + + res =3D sendto(fd, &frame, sizeof(frame), 0, + (struct sockaddr *)&dst_addr, sizeof(dst_addr)); + close(fd); + if (res !=3D (ssize_t)sizeof(frame)) { + perror("sendto"); + return 1; + } + return 0; +} + +int main(int argc, char **argv) +{ + struct cfg cfg =3D {}; + + if (parse_args(argc, argv, &cfg)) { + usage(argv[0]); + return 3; + } + + switch (cfg.mode) { + case MODE_END_MAP: + return send_end_map(&cfg); + default: + usage(argv[0]); + return 3; + } +} --=20 2.50.1