link/inet6: add support for tokenized interface identifiers

http://tools.ietf.org/html/draft-chown-6man-tokenised-ipv6-identifiers-02

[thaller@redhat.com: Add OOM handling, fix whitespace issues]

https://github.com/thom311/libnl/pull/63

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Thomas Haller <thaller@redhat.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/lib/route/link/inet6.c b/lib/route/link/inet6.c
index 0f096fc..f5b1802 100644
--- a/lib/route/link/inet6.c
+++ b/lib/route/link/inet6.c
@@ -22,6 +22,7 @@ struct inet6_data
 	uint32_t		i6_flags;
 	struct ifla_cacheinfo	i6_cacheinfo;
 	uint32_t		i6_conf[DEVCONF_MAX];
+	struct in6_addr		i6_token;
 	uint8_t			i6_addr_gen_mode;
 };
 
@@ -57,6 +58,7 @@ static struct nla_policy inet6_policy[IFLA_INET6_MAX+1] = {
 	[IFLA_INET6_CONF]		= { .minlen = 4 },
 	[IFLA_INET6_STATS]		= { .minlen = 8 },
 	[IFLA_INET6_ICMP6STATS]		= { .minlen = 8 },
+	[IFLA_INET6_TOKEN]		= { .minlen = sizeof(struct in6_addr) },
 	[IFLA_INET6_ADDR_GEN_MODE]	= { .type = NLA_U8 },
 };
 
@@ -166,6 +168,10 @@ static int inet6_parse_protinfo(struct rtnl_link *link, struct nlattr *attr,
 		nla_memcpy(&i6->i6_conf, tb[IFLA_INET6_CONF],
 			   sizeof(i6->i6_conf));
 
+	if (tb[IFLA_INET6_TOKEN])
+		nla_memcpy(&i6->i6_token, tb[IFLA_INET6_TOKEN],
+		           sizeof(struct in6_addr));
+
 	if (tb[IFLA_INET6_ADDR_GEN_MODE])
 		i6->i6_addr_gen_mode = nla_get_u8 (tb[IFLA_INET6_ADDR_GEN_MODE]);
 
@@ -306,6 +312,7 @@ static void inet6_dump_details(struct rtnl_link *link,
 				struct nl_dump_params *p, void *data)
 {
 	struct inet6_data *i6 = data;
+	struct nl_addr *addr;
 	char buf[64], buf2[64];
 	int i, n = 0;
 
@@ -323,6 +330,11 @@ static void inet6_dump_details(struct rtnl_link *link,
 	nl_dump(p, " retrans-time %s\n",
 		nl_msec2str(i6->i6_cacheinfo.retrans_time, buf, sizeof(buf)));
 
+	addr = nl_addr_build(AF_INET6, &i6->i6_token, sizeof(i6->i6_token));
+	nl_dump(p, " token %s\n",
+		nl_addr2str(addr, buf, sizeof(buf)));
+	nl_addr_put(addr);
+
 	nl_dump(p, " link-local address mode %s\n",
 		rtnl_link_inet6_addrgenmode2str(i6->i6_addr_gen_mode,
 						buf, sizeof(buf)));
@@ -521,6 +533,64 @@ static struct rtnl_link_af_ops inet6_ops = {
 };
 
 /**
+ * Get IPv6 tokenized interface identifier
+ * @arg link		Link object
+ * @arg token		Tokenized interface identifier on success
+ *
+ * Returns the link's IPv6 tokenized interface identifier.
+ *
+ * @return 0 on success
+ * @return -NLE_NOMEM  failure to allocate struct nl_addr result
+ * @return -NLE_NOATTR configuration setting not available
+ * @return -NLE_NOADDR tokenized interface identifier is not set
+ */
+int rtnl_link_inet6_get_token(struct rtnl_link *link, struct nl_addr **addr)
+{
+	struct inet6_data *id;
+
+	if (!(id = rtnl_link_af_data(link, &inet6_ops)))
+		return -NLE_NOATTR;
+
+	*addr = nl_addr_build(AF_INET6, &id->i6_token, sizeof(id->i6_token));
+	if (!*addr)
+		return -NLE_NOMEM;
+	if (nl_addr_iszero(*addr)) {
+		nl_addr_put(*addr);
+		*addr = NULL;
+		return -NLE_NOADDR;
+	}
+
+	return 0;
+}
+
+/**
+ * Set IPv6 tokenized interface identifier
+ * @arg link		Link object
+ * @arg token		Tokenized interface identifier
+ *
+ * Sets the link's IPv6 tokenized interface identifier.
+ *
+ * @return 0 on success
+ * @return -NLE_NOMEM could not allocate inet6 data
+ * @return -NLE_INVAL addr is not a valid inet6 address
+ */
+int rtnl_link_inet6_set_token(struct rtnl_link *link, struct nl_addr *addr)
+{
+	struct inet6_data *id;
+
+	if ((nl_addr_get_family(addr) != AF_INET6) ||
+	    (nl_addr_get_len(addr) != sizeof(id->i6_token)))
+		return -NLE_INVAL;
+
+	if (!(id = rtnl_link_af_alloc(link, &inet6_ops)))
+		return -NLE_NOMEM;
+
+	memcpy(&id->i6_token, nl_addr_get_binary_addr(addr),
+	       sizeof(id->i6_token));
+	return 0;
+}
+
+/**
  * Get IPv6 link-local address generation mode
  * @arg link		Link object
  * @arg mode		Generation mode on success