[ovs-dev] [RFC PATCH 4/7] netlink: helper functions for ipv6 address in netlink attrs

[Thadeu Lima de Souza Cascardo]

From: Jiri Benc <jb...@redhat.com>

[cascardo: add NL_A_IPV6, used in next patch]

Signed-off-by: Jiri Benc <jb...@redhat.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <casca...@redhat.com>
---
 lib/netlink.c | 20 ++++++++++++++++++++
 lib/netlink.h |  6 ++++++
 2 files changed, 26 insertions(+)

diff --git a/lib/netlink.c b/lib/netlink.c
index 09723b2..6bb3537 100644
--- a/lib/netlink.c
+++ b/lib/netlink.c
@@ -308,6 +308,15 @@ nl_msg_put_be64(struct ofpbuf *msg, uint16_t type, 
ovs_be64 value)
     nl_msg_put_unspec(msg, type, &value, sizeof value);
 }
 
+/* Appends a Netlink attribute of the given 'type' and the given IPv6
+ * address order 'value' to 'msg'. */
+void
+nl_msg_put_in6_addr(struct ofpbuf *msg, uint16_t type,
+                    const struct in6_addr *value)
+{
+    nl_msg_put_unspec(msg, type, value, sizeof *value);
+}
+
 /* Appends a Netlink attribute of the given 'type' and the given odp_port_t
  * 'value' to 'msg'. */
 void
@@ -603,6 +612,15 @@ nl_attr_get_be64(const struct nlattr *nla)
     return get_32aligned_be64(x);
 }
 
+/* Returns the IPv6 address value in 'nla''s payload.
+ *
+ * Asserts that 'nla''s payload is at least 16 bytes long. */
+struct in6_addr
+nl_attr_get_in6_addr(const struct nlattr *nla)
+{
+    return NL_ATTR_GET_AS(nla, struct in6_addr);
+}
+
 /* Returns the 32-bit odp_port_t value in 'nla''s payload.
  *
  * Asserts that 'nla''s payload is at least 4 bytes long. */
@@ -643,6 +661,7 @@ min_attr_len(enum nl_attr_type type)
     case NL_A_U64: return 8;
     case NL_A_STRING: return 1;
     case NL_A_FLAG: return 0;
+    case NL_A_IPV6: return 16;
     case NL_A_NESTED: return 0;
     case N_NL_ATTR_TYPES: default: OVS_NOT_REACHED();
     }
@@ -661,6 +680,7 @@ max_attr_len(enum nl_attr_type type)
     case NL_A_U64: return 8;
     case NL_A_STRING: return SIZE_MAX;
     case NL_A_FLAG: return SIZE_MAX;
+    case NL_A_IPV6: return 16;
     case NL_A_NESTED: return SIZE_MAX;
     case N_NL_ATTR_TYPES: default: OVS_NOT_REACHED();
     }
diff --git a/lib/netlink.h b/lib/netlink.h
index 6068f5d..eed71dd 100644
--- a/lib/netlink.h
+++ b/lib/netlink.h
@@ -31,6 +31,7 @@
  * Linux-specific definitions for Netlink sockets, see netlink-socket.h.
  */
 
+#include <netinet/in.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
@@ -69,6 +70,8 @@ void nl_msg_put_u64(struct ofpbuf *, uint16_t type, uint64_t 
value);
 void nl_msg_put_be16(struct ofpbuf *, uint16_t type, ovs_be16 value);
 void nl_msg_put_be32(struct ofpbuf *, uint16_t type, ovs_be32 value);
 void nl_msg_put_be64(struct ofpbuf *, uint16_t type, ovs_be64 value);
+void nl_msg_put_in6_addr(struct ofpbuf *msg, uint16_t type,
+                         const struct in6_addr *value);
 void nl_msg_put_odp_port(struct ofpbuf *, uint16_t type, odp_port_t value);
 void nl_msg_put_string(struct ofpbuf *, uint16_t type, const char *value);
 
@@ -111,6 +114,7 @@ struct nlmsghdr *nl_msg_next(struct ofpbuf *buffer, struct 
ofpbuf *msg);
 #define NL_A_BE32_SIZE NL_ATTR_SIZE(sizeof(ovs_be32))
 #define NL_A_BE64_SIZE NL_ATTR_SIZE(sizeof(ovs_be64))
 #define NL_A_FLAG_SIZE NL_ATTR_SIZE(0)
+#define NL_A_IPV6_SIZE NL_ATTR_SIZE(sizeof(struct in6_addr))
 
 bool nl_attr_oversized(size_t payload_size);
 
@@ -128,6 +132,7 @@ enum nl_attr_type
     NL_A_BE64 = NL_A_U64,
     NL_A_STRING,
     NL_A_FLAG,
+    NL_A_IPV6,
     NL_A_NESTED,
     N_NL_ATTR_TYPES
 };
@@ -189,6 +194,7 @@ uint64_t nl_attr_get_u64(const struct nlattr *);
 ovs_be16 nl_attr_get_be16(const struct nlattr *);
 ovs_be32 nl_attr_get_be32(const struct nlattr *);
 ovs_be64 nl_attr_get_be64(const struct nlattr *);
+struct in6_addr nl_attr_get_in6_addr(const struct nlattr *nla);
 odp_port_t nl_attr_get_odp_port(const struct nlattr *);
 const char *nl_attr_get_string(const struct nlattr *);
 void nl_attr_get_nested(const struct nlattr *, struct ofpbuf *);
-- 
2.4.3

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