app/crypto-perf: support lookaside IPsec

[dpdk.git] / lib / net / rte_ip.h

diff --git a/lib/net/rte_ip.h b/lib/net/rte_ip.h
index 8c18900..b3d45e8 100644 (file)
--- a/lib/net/rte_ip.h
+++ b/lib/net/rte_ip.h
@@ -22,9 +22,10 @@
 #else
 #include <sys/socket.h>
 #include <sys/types.h>
-#include <arpa/inet.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
 #include <netinet/ip.h>
+#include <netinet/ip6.h>
 #endif
 
 #include <rte_byteorder.h>
@@ -344,20 +345,10 @@ rte_ipv4_phdr_cksum(const struct rte_ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
 }
 
 /**
- * Process the IPv4 UDP or TCP checksum.
- *
- * The IP and layer 4 checksum must be set to 0 in the packet by
- * the caller.
- *
- * @param ipv4_hdr
- *   The pointer to the contiguous IPv4 header.
- * @param l4_hdr
- *   The pointer to the beginning of the L4 header.
- * @return
- *   The complemented checksum to set in the IP packet.
+ * @internal Calculate the non-complemented IPv4 L4 checksum
  */
 static inline uint16_t
-rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
+__rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
 {
        uint32_t cksum;
        uint32_t l3_len, l4_len;
@@ -374,16 +365,64 @@ rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
        cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
 
        cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
-       cksum = (~cksum) & 0xffff;
+
+       return (uint16_t)cksum;
+}
+
+/**
+ * Process the IPv4 UDP or TCP checksum.
+ *
+ * The layer 4 checksum must be set to 0 in the L4 header by the caller.
+ *
+ * @param ipv4_hdr
+ *   The pointer to the contiguous IPv4 header.
+ * @param l4_hdr
+ *   The pointer to the beginning of the L4 header.
+ * @return
+ *   The complemented checksum to set in the L4 header.
+ */
+static inline uint16_t
+rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
+{
+       uint16_t cksum = __rte_ipv4_udptcp_cksum(ipv4_hdr, l4_hdr);
+
+       cksum = ~cksum;
+
        /*
-        * Per RFC 768:If the computed checksum is zero for UDP,
+        * Per RFC 768: If the computed checksum is zero for UDP,
         * it is transmitted as all ones
         * (the equivalent in one's complement arithmetic).
         */
        if (cksum == 0 && ipv4_hdr->next_proto_id == IPPROTO_UDP)
                cksum = 0xffff;
 
-       return (uint16_t)cksum;
+       return cksum;
+}
+
+/**
+ * Validate the IPv4 UDP or TCP checksum.
+ *
+ * In case of UDP, the caller must first check if udp_hdr->dgram_cksum is 0
+ * (i.e. no checksum).
+ *
+ * @param ipv4_hdr
+ *   The pointer to the contiguous IPv4 header.
+ * @param l4_hdr
+ *   The pointer to the beginning of the L4 header.
+ * @return
+ *   Return 0 if the checksum is correct, else -1.
+ */
+__rte_experimental
+static inline int
+rte_ipv4_udptcp_cksum_verify(const struct rte_ipv4_hdr *ipv4_hdr,
+                            const void *l4_hdr)
+{
+       uint16_t cksum = __rte_ipv4_udptcp_cksum(ipv4_hdr, l4_hdr);
+
+       if (cksum != 0xffff)
+               return -1;
+
+       return 0;
 }
 
 /**
@@ -448,32 +487,45 @@ rte_ipv6_phdr_cksum(const struct rte_ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
        return __rte_raw_cksum_reduce(sum);
 }
 
+/**
+ * @internal Calculate the non-complemented IPv6 L4 checksum
+ */
+static inline uint16_t
+__rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr)
+{
+       uint32_t cksum;
+       uint32_t l4_len;
+
+       l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
+
+       cksum = rte_raw_cksum(l4_hdr, l4_len);
+       cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
+
+       cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
+
+       return (uint16_t)cksum;
+}
+
 /**
  * Process the IPv6 UDP or TCP checksum.
  *
- * The IPv4 header should not contains options. The layer 4 checksum
- * must be set to 0 in the packet by the caller.
+ * The IPv6 header must not be followed by extension headers. The layer 4
+ * checksum must be set to 0 in the L4 header by the caller.
  *
  * @param ipv6_hdr
  *   The pointer to the contiguous IPv6 header.
  * @param l4_hdr
  *   The pointer to the beginning of the L4 header.
  * @return
- *   The complemented checksum to set in the IP packet.
+ *   The complemented checksum to set in the L4 header.
  */
 static inline uint16_t
 rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr)
 {
-       uint32_t cksum;
-       uint32_t l4_len;
+       uint16_t cksum = __rte_ipv6_udptcp_cksum(ipv6_hdr, l4_hdr);
 
-       l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
+       cksum = ~cksum;
 
-       cksum = rte_raw_cksum(l4_hdr, l4_len);
-       cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
-
-       cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
-       cksum = (~cksum) & 0xffff;
        /*
         * Per RFC 768: If the computed checksum is zero for UDP,
         * it is transmitted as all ones
@@ -482,7 +534,34 @@ rte_ipv6_udptcp_cksum(const struct rte_ipv6_hdr *ipv6_hdr, const void *l4_hdr)
        if (cksum == 0 && ipv6_hdr->proto == IPPROTO_UDP)
                cksum = 0xffff;
 
-       return (uint16_t)cksum;
+       return cksum;
+}
+
+/**
+ * Validate the IPv6 UDP or TCP checksum.
+ *
+ * In case of UDP, the caller must first check if udp_hdr->dgram_cksum is 0:
+ * this is either invalid or means no checksum in some situations. See 8.1
+ * (Upper-Layer Checksums) in RFC 8200.
+ *
+ * @param ipv6_hdr
+ *   The pointer to the contiguous IPv6 header.
+ * @param l4_hdr
+ *   The pointer to the beginning of the L4 header.
+ * @return
+ *   Return 0 if the checksum is correct, else -1.
+ */
+__rte_experimental
+static inline int
+rte_ipv6_udptcp_cksum_verify(const struct rte_ipv6_hdr *ipv6_hdr,
+                            const void *l4_hdr)
+{
+       uint16_t cksum = __rte_ipv6_udptcp_cksum(ipv6_hdr, l4_hdr);
+
+       if (cksum != 0xffff)
+               return -1;
+
+       return 0;
 }
 
 /** IPv6 fragment extension header. */