+/* Like struct in6_addr, but whereas that struct requires 32-bit alignment on
+ * most implementations, this one only requires 16-bit alignment. */
+union ovs_16aligned_in6_addr {
+ ovs_be16 be16[8];
+ ovs_16aligned_be32 be32[4];
+};
+
+/* Like struct in6_hdr, but whereas that struct requires 32-bit alignment, this
+ * one only requires 16-bit alignment. */
+struct ovs_16aligned_ip6_hdr {
+ union {
+ struct ovs_16aligned_ip6_hdrctl {
+ ovs_16aligned_be32 ip6_un1_flow;
+ ovs_be16 ip6_un1_plen;
+ uint8_t ip6_un1_nxt;
+ uint8_t ip6_un1_hlim;
+ } ip6_un1;
+ uint8_t ip6_un2_vfc;
+ } ip6_ctlun;
+ union ovs_16aligned_in6_addr ip6_src;
+ union ovs_16aligned_in6_addr ip6_dst;
+};
+
+/* Like struct in6_frag, but whereas that struct requires 32-bit alignment,
+ * this one only requires 16-bit alignment. */
+struct ovs_16aligned_ip6_frag {
+ uint8_t ip6f_nxt;
+ uint8_t ip6f_reserved;
+ ovs_be16 ip6f_offlg;
+ ovs_16aligned_be32 ip6f_ident;
+};
+
+/* The IPv6 flow label is in the lower 20 bits of the first 32-bit word. */
+#define IPV6_LABEL_MASK 0x000fffff
+
+/* Example:
+ *
+ * char *string = "1 ::1 2";
+ * char ipv6_s[IPV6_SCAN_LEN + 1];
+ * struct in6_addr ipv6;
+ *
+ * if (ovs_scan(string, "%d"IPV6_SCAN_FMT"%d", &a, ipv6_s, &b)
+ * && inet_pton(AF_INET6, ipv6_s, &ipv6) == 1) {
+ * ...
+ * }
+ */
+#define IPV6_SCAN_FMT "%46[0123456789abcdefABCDEF:.]"
+#define IPV6_SCAN_LEN 46
+