From: Maciej Żenczykowski <maze@google.com>
Date: Fri, 19 Jul 2019 06:30:03 +0000 (-0700)
Subject: net-ipv6-ndisc: add support for RFC7710 RA Captive Portal Identifier
X-Git-Tag: v5.4-rc1~131^2~395
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=66b5f1c439843bcbab01cc7f3854ae2742f3d1e3;p=platform%2Fkernel%2Flinux-rpi.git

net-ipv6-ndisc: add support for RFC7710 RA Captive Portal Identifier

This is trivial since we already have support for the entirely
identical (from the kernel's point of view) RDNSS and DNSSL that
also contain opaque data that needs to be passed down to userspace.

As specified in RFC7710, Captive Portal option contains a URL.
8-bit identifier of the option type as assigned by the IANA is 37.
This option should also be treated as userland.

Hence, treat ND option 37 as userland (Captive Portal support)

See:
  https://tools.ietf.org/html/rfc7710
  https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xhtml

Fixes: e35f30c131a56
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: Remin Nguyen Van <reminv@google.com>
Cc: Alexey I. Froloff <raorn@raorn.name>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index 3661500..b2f715c 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -40,6 +40,7 @@ enum {
 	ND_OPT_RDNSS = 25,		/* RFC5006 */
 	ND_OPT_DNSSL = 31,		/* RFC6106 */
 	ND_OPT_6CO = 34,		/* RFC6775 */
+	ND_OPT_CAPTIVE_PORTAL = 37,	/* RFC7710 */
 	__ND_OPT_MAX
 };
 
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 083cc1c..53caf59 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -196,6 +196,7 @@ static inline int ndisc_is_useropt(const struct net_device *dev,
 {
 	return opt->nd_opt_type == ND_OPT_RDNSS ||
 		opt->nd_opt_type == ND_OPT_DNSSL ||
+		opt->nd_opt_type == ND_OPT_CAPTIVE_PORTAL ||
 		ndisc_ops_is_useropt(dev, opt->nd_opt_type);
 }