From b5afadae8ed69c98f4e9e6a33dfaf570c5bd9b51 Mon Sep 17 00:00:00 2001
From: Steven Barth <steven@midlink.org>
Date: Sun, 12 Apr 2015 09:15:22 +0200
Subject: [PATCH] Remove obsolete prefix class support

Signed-off-by: Steven Barth <steven@midlink.org>
---
 src/dhcpv6.c  | 23 +----------------------
 src/odhcp6c.c |  4 +---
 src/odhcp6c.h |  5 -----
 src/ra.c      |  2 +-
 src/script.c  |  4 +---
 5 files changed, 4 insertions(+), 34 deletions(-)

diff --git a/src/dhcpv6.c b/src/dhcpv6.c
index 6ae6f7a..000d999 100644
--- a/src/dhcpv6.c
+++ b/src/dhcpv6.c
@@ -173,9 +173,6 @@ int init_dhcpv6(const char *ifname, unsigned int options, int sol_timeout)
 			htons(DHCPV6_OPT_PD_EXCLUDE),
 			htons(DHCPV6_OPT_SOL_MAX_RT),
 			htons(DHCPV6_OPT_INF_MAX_RT),
-#ifdef EXT_PREFIX_CLASS
-			htons(DHCPV6_OPT_PREFIX_CLASS),
-#endif
 #ifdef EXT_CER_ID
 			htons(DHCPV6_OPT_CER_ID),
 #endif
@@ -1146,7 +1143,7 @@ static int dhcpv6_parse_ia(void *opt, void *end)
 	// Update address IA
 	dhcpv6_for_each_option(&ia_hdr[1], end, otype, olen, odata) {
 		struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
-				IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
+				IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0};
 
 		entry.iaid = ia_hdr->iaid;
 
@@ -1171,14 +1168,6 @@ static int dhcpv6_parse_ia(void *opt, void *end)
 			uint16_t stype, slen;
 			uint8_t *sdata;
 
-#ifdef EXT_PREFIX_CLASS
-			// Find prefix class, if any
-			dhcpv6_for_each_option(&prefix[1], odata + olen,
-					stype, slen, sdata)
-				if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
-					entry.class = sdata[0] << 8 | sdata[1];
-#endif
-
 			// Parse PD-exclude
 			bool ok = true;
 			dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
@@ -1242,16 +1231,6 @@ static int dhcpv6_parse_ia(void *opt, void *end)
 			entry.length = 128;
 			entry.target = addr->addr;
 
-#ifdef EXT_PREFIX_CLASS
-			uint16_t stype, slen;
-			uint8_t *sdata;
-			// Find prefix class, if any
-			dhcpv6_for_each_option(&addr[1], odata + olen,
-					stype, slen, sdata)
-				if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
-					entry.class = sdata[0] << 8 | sdata[1];
-#endif
-
 			odhcp6c_update_entry(STATE_IA_NA, &entry, 0, false);
 			parsed_ia++;
 		}
diff --git a/src/odhcp6c.c b/src/odhcp6c.c
index dce1e0e..2d82856 100644
--- a/src/odhcp6c.c
+++ b/src/odhcp6c.c
@@ -584,14 +584,12 @@ bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new,
 					new->valid - x->valid < min_update_interval &&
 					new->preferred >= x->preferred &&
 					new->preferred != UINT32_MAX &&
-					new->preferred - x->preferred < min_update_interval &&
-					x->class == new->class)
+					new->preferred - x->preferred < min_update_interval)
 				return false;
 			x->valid = new->valid;
 			x->preferred = new->preferred;
 			x->t1 = new->t1;
 			x->t2 = new->t2;
-			x->class = new->class;
 			x->iaid = new->iaid;
 		} else {
 			odhcp6c_add_state(state, new, sizeof(*new));
diff --git a/src/odhcp6c.h b/src/odhcp6c.h
index ff5b9e4..f7ddc96 100644
--- a/src/odhcp6c.h
+++ b/src/odhcp6c.h
@@ -65,10 +65,6 @@ enum dhcvp6_opt {
 	DHCPV6_OPT_PD_EXCLUDE = 67,
 	DHCPV6_OPT_SOL_MAX_RT = 82,
 	DHCPV6_OPT_INF_MAX_RT = 83,
-#ifdef EXT_PREFIX_CLASS
-	/* draft-bhandari-dhc-class-based-prefix, not yet standardized */
-	DHCPV6_OPT_PREFIX_CLASS = EXT_PREFIX_CLASS,
-#endif
 #ifdef EXT_CER_ID
 	/* draft-donley-dhc-cer-id-option-03 */
 	DHCPV6_OPT_CER_ID = EXT_CER_ID,
@@ -300,7 +296,6 @@ struct odhcp6c_entry {
 	uint32_t preferred;
 	uint32_t t1;
 	uint32_t t2;
-	uint16_t class;
 	uint32_t iaid;
 };
 
diff --git a/src/ra.c b/src/ra.c
index 122f99e..5809fcd 100644
--- a/src/ra.c
+++ b/src/ra.c
@@ -274,7 +274,7 @@ bool ra_process(void)
 	bool changed = false;
 	uint8_t buf[1500], cmsg_buf[128];
 	struct nd_router_advert *adv = (struct nd_router_advert*)buf;
-	struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
+	struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0};
 	const struct in6_addr any = IN6ADDR_ANY_INIT;
 
 	if (IN6_IS_ADDR_UNSPECIFIED(&lladdr)) {
diff --git a/src/script.c b/src/script.c
index 2c34216..f8d440f 100644
--- a/src/script.c
+++ b/src/script.c
@@ -163,9 +163,7 @@ static void entry_to_env(const char *name, const void *data, size_t len, enum en
 				buf_len += snprintf(&buf[buf_len], 24, ",%u,%u", e[i].preferred, e[i].valid);
 			}
 
-			if ((type == ENTRY_PREFIX || type == ENTRY_ADDRESS) && e[i].class)
-				buf_len += snprintf(&buf[buf_len], 12, ",class=%u", e[i].class);
-			else if (type == ENTRY_PREFIX && ntohl(e[i].iaid) != 1)
+			if (type == ENTRY_PREFIX && ntohl(e[i].iaid) != 1)
 				buf_len += snprintf(&buf[buf_len], 16, ",class=%08x", ntohl(e[i].iaid));
 
 			if (type == ENTRY_PREFIX && e[i].priority) {
-- 
2.39.2