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Date: Mon, 25 Nov 2013 17:16:45 +0100
From: fx.lebail@...oo.com
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
James Morris <jmorris@...ei.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Patrick McHardy <kaber@...sh.net>,
Francois-Xavier Le Bail <fx.lebail@...oo.com>
Subject: [PATCH] ipv6 addrconf: source address selection, Rule 7: Prefer temporary addresses (RFC 6724)
The RFC 6724 change the default recommendation for source address selection
Rule 7 to prefer temporary addresses rather than public addresses,
while providing an administrative override.
The administrative override is based on the prefer_src_public sysctl.
Signed-off-by: Francois-Xavier Le Bail <fx.lebail@...oo.com>
---
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 3c12d9a..0f7ecaa 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1256,13 +1256,15 @@ router_solicitations - INTEGER
use_tempaddr - INTEGER
Preference for Privacy Extensions (RFC3041).
<= 0 : disable Privacy Extensions
- == 1 : enable Privacy Extensions, but prefer public
- addresses over temporary addresses.
- > 1 : enable Privacy Extensions and prefer temporary
- addresses over public addresses.
+ >= 1 : enable Privacy Extensions and prefer temporary
+ addresses over public addresses (RFC 6724).
Default: 0 (for most devices)
-1 (for point-to-point devices and loopback devices)
+prefer_src_public - BOOLEAN
+ Prefer public addresses over temporary addresses.
+ Default: FALSE
+
temp_valid_lft - INTEGER
valid lifetime (in seconds) for temporary addresses.
Default: 604800 (7 days)
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 5d89d1b..c90a1e6 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -49,6 +49,7 @@ struct ipv6_devconf {
__s32 force_tllao;
__s32 ndisc_notify;
__s32 suppress_frag_ndisc;
+ __s32 prefer_src_public;
void *sysctl;
};
diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index 593b0e3..37dabcc 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_PREFER_SRC_PUBLIC,
DEVCONF_MAX
};
diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
index 6d67213..0034b48 100644
--- a/include/uapi/linux/sysctl.h
+++ b/include/uapi/linux/sysctl.h
@@ -568,6 +568,7 @@ enum {
NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN=22,
NET_IPV6_PROXY_NDP=23,
NET_IPV6_ACCEPT_SOURCE_ROUTE=25,
+ NET_IPV6_PREFER_SRC_PUBLIC = 26,
__NET_IPV6_MAX
};
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 12c97d8..b0127cd 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -197,6 +197,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = {
.disable_ipv6 = 0,
.accept_dad = 1,
.suppress_frag_ndisc = 1,
+ .prefer_src_public = 0,
};
static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
@@ -233,6 +234,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
.disable_ipv6 = 0,
.accept_dad = 1,
.suppress_frag_ndisc = 1,
+ .prefer_src_public = 0,
};
/* Check if a valid qdisc is available */
@@ -1245,12 +1247,14 @@ static int ipv6_get_saddr_eval(struct net *net,
break;
case IPV6_SADDR_RULE_PRIVACY:
{
- /* Rule 7: Prefer public address
- * Note: prefer temporary address if use_tempaddr >= 2
+ /* Rule 7: Prefer temporary addresses (updated in RFC 6724)
+ * Note: test on use_tempaddr >= 1 to avoid changing previous
+ * behaviour using > 1 value for the same purpose
*/
int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
- score->ifa->idev->cnf.use_tempaddr >= 2;
+ score->ifa->idev->cnf.use_tempaddr >= 1 &&
+ !score->ifa->idev->cnf.prefer_src_public;
ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
break;
}
@@ -4120,6 +4124,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
+ array[DEVCONF_PREFER_SRC_PUBLIC] = cnf->prefer_src_public;
}
static inline size_t inet6_ifla6_size(void)
@@ -4939,6 +4944,13 @@ static struct addrconf_sysctl_table
.proc_handler = proc_dointvec
},
{
+ .procname = "prefer_src_public",
+ .data = &ipv6_devconf.prefer_src_public,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
/* sentinel */
}
},
--
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