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[PATCH 3.13.y-ckt 122/138] net/ipv6: add sysctl option accept_ra_min_hop_limit

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.13.y-ckt 122/138] net/ipv6: add sysctl option accept_ra_min_hop_limit
Date 2016-03-10 00:30 +0100
Message-ID <raVIg-6Sb-71@gated-at.bofh.it> (permalink)
References <raVyx-6Nd-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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3.13.11-ckt36 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Hangbin Liu <liuhangbin@gmail.com>

commit 8013d1d7eafb0589ca766db6b74026f76b7f5cb4 upstream.

Commit 6fd99094de2b ("ipv6: Don't reduce hop limit for an interface")
disabled accept hop limit from RA if it is smaller than the current hop
limit for security stuff. But this behavior kind of break the RFC definition.

RFC 4861, 6.3.4.  Processing Received Router Advertisements
   A Router Advertisement field (e.g., Cur Hop Limit, Reachable Time,
   and Retrans Timer) may contain a value denoting that it is
   unspecified.  In such cases, the parameter should be ignored and the
   host should continue using whatever value it is already using.

   If the received Cur Hop Limit value is non-zero, the host SHOULD set
   its CurHopLimit variable to the received value.

So add sysctl option accept_ra_min_hop_limit to let user choose the minimum
hop limit value they can accept from RA. And set default to 1 to meet RFC
standards.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 Documentation/networking/ip-sysctl.txt |  8 ++++++++
 include/linux/ipv6.h                   |  1 +
 include/uapi/linux/ipv6.h              |  1 +
 net/ipv6/addrconf.c                    | 10 ++++++++++
 net/ipv6/ndisc.c                       | 16 +++++++---------
 5 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index b4be7fd..9a11e8d 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1143,6 +1143,14 @@ accept_ra_defrtr - BOOLEAN
 	Functional default: enabled if accept_ra is enabled.
 			    disabled if accept_ra is disabled.
 
+accept_ra_min_hop_limit - INTEGER
+	Minimum hop limit Information in Router Advertisement.
+
+	Hop limit Information in Router Advertisement less than this
+	variable shall be ignored.
+
+	Default: 1
+
 accept_ra_pinfo - BOOLEAN
 	Learn Prefix Information in Router Advertisement.
 
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index c56c350..dc80edd 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -29,6 +29,7 @@ struct ipv6_devconf {
 	__s32		max_desync_factor;
 	__s32		max_addresses;
 	__s32		accept_ra_defrtr;
+	__s32		accept_ra_min_hop_limit;
 	__s32		accept_ra_pinfo;
 #ifdef CONFIG_IPV6_ROUTER_PREF
 	__s32		accept_ra_rtr_pref;
diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index 593b0e3..f1d3214 100644
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -163,6 +163,7 @@ enum {
 	DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL,
 	DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,
 	DEVCONF_SUPPRESS_FRAG_NDISC,
+	DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
 	DEVCONF_MAX
 };
 
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2be400d..dd8b55b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -184,6 +184,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = {
 	.max_desync_factor	= MAX_DESYNC_FACTOR,
 	.max_addresses		= IPV6_MAX_ADDRESSES,
 	.accept_ra_defrtr	= 1,
+	.accept_ra_min_hop_limit= 1,
 	.accept_ra_pinfo	= 1,
 #ifdef CONFIG_IPV6_ROUTER_PREF
 	.accept_ra_rtr_pref	= 1,
@@ -220,6 +221,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 	.max_desync_factor	= MAX_DESYNC_FACTOR,
 	.max_addresses		= IPV6_MAX_ADDRESSES,
 	.accept_ra_defrtr	= 1,
+	.accept_ra_min_hop_limit= 1,
 	.accept_ra_pinfo	= 1,
 #ifdef CONFIG_IPV6_ROUTER_PREF
 	.accept_ra_rtr_pref	= 1,
@@ -4125,6 +4127,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
 	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
 	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
 	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
+	array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
 	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
 #ifdef CONFIG_IPV6_ROUTER_PREF
 	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
@@ -4864,6 +4867,13 @@ static struct addrconf_sysctl_table
 			.proc_handler	= proc_dointvec,
 		},
 		{
+			.procname	= "accept_ra_min_hop_limit",
+			.data		= &ipv6_devconf.accept_ra_min_hop_limit,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
 			.procname	= "accept_ra_pinfo",
 			.data		= &ipv6_devconf.accept_ra_pinfo,
 			.maxlen		= sizeof(int),
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index ac0bbe8..4e62e51 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1190,18 +1190,16 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 
 	if (rt)
 		rt6_set_expires(rt, jiffies + (HZ * lifetime));
-	if (ra_msg->icmph.icmp6_hop_limit) {
-		/* Only set hop_limit on the interface if it is higher than
-		 * the current hop_limit.
-		 */
-		if (in6_dev->cnf.hop_limit < ra_msg->icmph.icmp6_hop_limit) {
+	if (in6_dev->cnf.accept_ra_min_hop_limit < 256 &&
+	    ra_msg->icmph.icmp6_hop_limit) {
+		if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) {
 			in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
+			if (rt)
+				dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
+					       ra_msg->icmph.icmp6_hop_limit);
 		} else {
-			ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than current\n");
+			ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n");
 		}
-		if (rt)
-			dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
-				       ra_msg->icmph.icmp6_hop_limit);
 	}
 
 skip_defrtr:
-- 
2.7.0

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  [PATCH 3.13.y-ckt 057/138] mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 046/138] target: Fix remote-port TMR ABORT + se_cmd fabric stop Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 048/138] [media] tda1004x: only update the frontend properties if locked Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
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  [PATCH 3.13.y-ckt 037/138] radix-tree: fix race in gang lookup Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 035/138] ALSA: seq: Fix lockdep warnings due to double mutex locks Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 036/138] drivers/scsi/sg.c: mark VMA as VM_IO to prevent migration Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
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  [PATCH 3.13.y-ckt 042/138] target: Add TFO->abort_task for aborted task resources release Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 040/138] xhci: Fix list corruption in urb dequeue at host removal Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 047/138] target: Fix race with SCF_SEND_DELAYED_TAS handling Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 045/138] target: Fix TAS handling for multi-session se_node_acls Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 038/138] Revert "xhci: don't finish a TD if we get a short-transfer event mid TD" Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 008/138] x86/entry/compat: Add missing CLAC to entry_INT80_32 Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 024/138] ALSA: pcm: Fix potential deadlock in OSS emulation Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 054/138] drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 022/138] ALSA: seq: Fix race at closing in virmidi driver Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 052/138] scsi_dh_rdac: always retry MODE SELECT on command lock violation Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 031/138] ALSA: hda - Add fixup for Mac Mini 7,1 model Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 050/138] [media] saa7134-alsa: Only frees registered sound cards Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 061/138] crypto: user - lock crypto_alg_list on alg dump Kamal Mostafa <kamal@canonical.com> - 2016-03-10 00:50 +0100
  [PATCH 3.13.y-ckt 012/138] libata: disable forced PORTS_IMPL for >= AHCI 1.3 Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 019/138] crypto: algif_hash - wait for crypto_ahash_init() to complete Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 004/138] EVM: Use crypto_memneq() for digest comparisons Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 003/138] iw_cxgb3: Fix incorrectly returning error on success Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 005/138] ALSA: usb-audio: avoid freeing umidi object twice Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 014/138] mac80211: Requeue work after scan complete for all VIF types. Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 013/138] mac80211: start_next_roc only if scan was actually running Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 007/138] bcache: Fix a lockdep splat in an error path Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 018/138] target: Fix WRITE_SAME/DISCARD conversion to linux 512b sectors Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100
  [PATCH 3.13.y-ckt 010/138] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG Kamal Mostafa <kamal@canonical.com> - 2016-03-10 01:00 +0100

csiph-web