Introduce new function for IPv6 header extension parsing able to
determine extension length and next protocol number.
This function is helpful when implementing IPv6 header traversing.
Signed-off-by: Marcin Smoczynski <marcinx.smoczyn...@intel.com>
---
lib/librte_net/rte_ip.h | 49 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index f9b909090..be64da662 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -425,6 +425,55 @@ rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr,
const void *l4_hdr)
return (uint16_t)cksum;
}
+/* IPv6 fragmentation header size */
+#define RTE_IPV6_FRAG_HDR_SIZE 8
+
+/**
+ * Parse next IPv6 header extension
+ *
+ * This function checks if proto number is an IPv6 extensions and parses its
+ * data if so, providing information on next header and extension length.
+ *
+ * @param p
+ * Pointer to an extension raw data.
+ * @param proto
+ * Protocol number extracted from the "next header" field from
+ * the IPv6 header or the previous extension.
+ * @param ext_len
+ * Extension data length.
+ * @return
+ * next protocol number if proto is an IPv6 extension, -EINVAL otherwise
+ */
+static inline int __rte_experimental
+rte_ipv6_get_next_ext(uint8_t *p, int proto, size_t *ext_len)
+{
+ int next_proto;
+
+ switch (proto) {
+ case IPPROTO_AH:
+ next_proto = *p++;
+ *ext_len = (*p + 2) * sizeof(uint32_t);
+ break;
+
+ case IPPROTO_HOPOPTS:
+ case IPPROTO_ROUTING:
+ case IPPROTO_DSTOPTS:
+ next_proto = *p++;
+ *ext_len = (*p + 1) * sizeof(uint64_t);
+ break;
+
+ case IPPROTO_FRAGMENT:
+ next_proto = *p;
+ *ext_len = RTE_IPV6_FRAG_HDR_SIZE;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return next_proto;
+}
+
#ifdef __cplusplus
}
#endif
--
2.21.0.windows.1
