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From: =?utf-8?q?Bj=C3=B8rn_Mork?= <bjorn@mork.no>
Date: Wed, 10 Nov 2010 07:41:55 +0100
Subject: Adding ifid option to the dhcp6c.conf prefix-interface statement
MIME-Version: 1.0
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This adds the ability to override the default EUI-64 address selection.
Useful for interfaces without a unique hardware address, or for creating
more userfriendly addresses in general.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Jeremie Corbier <jeremie@famille-corbier.net>
---
 cfparse.y     | 10 +++++++++-
 cftoken.l     |  1 +
 config.c      | 19 ++++++++++++++-----
 config.h      |  2 +-
 dhcp6c.conf.5 | 10 ++++++++++
 5 files changed, 35 insertions(+), 7 deletions(-)

--- dhcp6c-20190419/cfparse.y.vanilla	2019-08-08 12:53:10.118777947 +0200
+++ dhcp6c-20190419/cfparse.y	2019-08-08 12:53:23.342778205 +0200
@@ -115,7 +115,7 @@
 %}
 
 %token INTERFACE IFNAME
-%token PREFIX_INTERFACE SLA_ID SLA_LEN DUID_ID
+%token PREFIX_INTERFACE SLA_ID SLA_LEN IFID DUID_ID
 %token ID_ASSOC IA_PD IAID IA_NA
 %token ADDRESS
 %token REQUEST SEND ALLOW PREFERENCE
@@ -1056,6 +1056,14 @@ ifparam:
 			l->num = $2;
 			$$ = l;
 		}
+	|	IFID NUMBER EOS
+		{
+			struct cf_list *l;
+
+			MAKE_CFLIST(l, IFPARAM_IFID, NULL, NULL);
+			l->num = (u_int64_t)$2;
+			$$ = l;
+		}
 	;
 
 ianaconf_list:
diff --git a/cftoken.l b/cftoken.l
index 4c9ed10..6afda5f 100644
--- a/cftoken.l
+++ b/cftoken.l
@@ -240,6 +240,7 @@ ecl		\}
 <S_CNF>prefix-interface { DECHO; BEGIN S_IFACE; return (PREFIX_INTERFACE); }
 <S_CNF>sla-id { DECHO; return (SLA_ID); }
 <S_CNF>sla-len { DECHO; return (SLA_LEN); }
+<S_CNF>ifid { DECHO; return (IFID); }
 
 	/* duration */
 <S_CNF>infinity { DECHO; return (INFINITY); }
diff --git a/config.c b/config.c
index 23598fc..e04d6a5 100644
--- a/config.c
+++ b/config.c
@@ -471,6 +471,7 @@ add_pd_pif(iapdc, cfl0)
 {
 	struct cf_list *cfl;
 	struct prefix_ifconf *pif;
+	int i, use_default_ifid = 1;
 
 	/* duplication check */
 	for (pif = TAILQ_FIRST(&iapdc->iapd_pif_list); pif;
@@ -552,11 +552,6 @@
 
 	pif->ifid_len = IFID_LEN_DEFAULT;
 	pif->sla_len = SLA_LEN_DEFAULT;
-	if (get_default_ifid(pif)) {
-		d_printf(LOG_NOTICE, FNAME,
-		    "failed to get default IF ID for %s", pif->ifname);
-		goto bad;
-	}
 
 	for (cfl = cfl0->list; cfl; cfl = cfl->next) {
 		switch(cfl->type) {
@@ -524,6 +520,11 @@ add_pd_pif(iapdc, cfl0)
 				goto bad;
 			}
 			break;
+		case IFPARAM_IFID:
+			for (i = sizeof(pif->ifid) -1; i >= 0; i--)
+				pif->ifid[i] = (cfl->num >> 8*(sizeof(pif->ifid) - 1 - i)) & 0xff;
+			use_default_ifid = 0;
+			break;
 		default:
 			debug_printf(LOG_ERR, FNAME, "%s:%d internal error: "
 			    "invalid configuration",
@@ -532,6 +533,14 @@ add_pd_pif(iapdc, cfl0)
 		}
 	}
 
+	if (use_default_ifid) {
+		if (get_default_ifid(pif)) {
+			d_printf(LOG_NOTICE, FNAME,
+			    "failed to get default IF ID for %s", pif->ifname);
+			goto bad;
+		}
+	}
+
 	TAILQ_INSERT_TAIL(&iapdc->iapd_pif_list, pif, link);
 	return (0);
 
diff --git a/config.h b/config.h
index ea8d17c..64ce9e8 100644
--- a/config.h
+++ b/config.h
@@ -266,7 +266,7 @@ enum { DECL_SEND, DECL_ALLOW, DECL_INFO_ONLY, DECL_REQUEST, DECL_DUID,
        DECL_PREFIX, DECL_PREFERENCE, DECL_SCRIPT, DECL_DELAYEDKEY,
        DECL_ADDRESS,
        DECL_RANGE, DECL_ADDRESSPOOL,
-       IFPARAM_SLA_ID, IFPARAM_SLA_LEN,
+       IFPARAM_SLA_ID, IFPARAM_SLA_LEN, IFPARAM_IFID,
        DHCPOPT_RAPID_COMMIT, DHCPOPT_AUTHINFO,
        DHCPOPT_DNS, DHCPOPT_DNSNAME,
        DHCPOPT_IA_PD, DHCPOPT_IA_NA, DHCPOPT_NTP,
diff --git a/dhcp6c.conf.5 b/dhcp6c.conf.5
index 3d5d25a..1c91d72 100644
--- a/dhcp6c.conf.5
+++ b/dhcp6c.conf.5
@@ -443,6 +443,16 @@ This statement specifies the length of the SLA ID in bits.
 must be a decimal number between 0 and 128.
 If the length is not specified by this statement,
 the default value 16 will be used.
+.It Xo
+.Ic ifid Ar ID
+;
+.Xc
+This statement specifies the interface id.
+.Ar ID
+must be a decimal integer.  It will be combined with the delegated
+prefix and the sla-id to form a complete interface address.  The
+default is to use the EUI-64 address of the
+.Ar interface .
 .El
 .El
 .\"