tunnel: support copying TTL and flow label from inner to outer

[vpp.git] / src / vnet / ip / ip4_packet.h

diff --git a/src/vnet/ip/ip4_packet.h b/src/vnet/ip/ip4_packet.h
index 9d63bae..513a744 100644 (file)
--- a/src/vnet/ip/ip4_packet.h
+++ b/src/vnet/ip/ip4_packet.h
@@ -43,6 +43,7 @@
 #include <vnet/ip/ip_packet.h> /* for ip_csum_t */
 #include <vnet/tcp/tcp_packet.h>       /* for tcp_header_t */
 #include <vppinfra/byte_order.h>       /* for clib_net_to_host_u16 */
+#include <vppinfra/warnings.h> /* for WARN_OFF/WARN_ON macro */
 
 /* IP4 address which can be accessed either as 4 bytes
    or as a 32-bit number. */
@@ -197,64 +198,122 @@ ip4_next_header (ip4_header_t * i)
   return (void *) i + ip4_header_bytes (i);
 }
 
-always_inline u16
-ip4_header_checksum (ip4_header_t * i)
+/* Turn off array bounds check due to ip4_header_t
+   option field operations. */
+
+/* *INDENT-OFF* */
+WARN_OFF(array-bounds)
+/* *INDENT-ON* */
+
+static_always_inline u16
+ip4_header_checksum_inline (ip4_header_t * i, int with_checksum)
 {
-  u16 *iphdr = (u16 *) i;
-  u32 sum = 0;
   int option_len = (i->ip_version_and_header_length & 0xf) - 5;
+  uword sum = 0;
+#if uword_bits == 64
+  u32 *iphdr = (u32 *) i;
+
+  sum += iphdr[0];
+  sum += iphdr[1];
+  sum += with_checksum ? iphdr[2] : *(u16 *) (iphdr + 2);
+  /* skip checksum */
+  sum += iphdr[3];
+  sum += iphdr[4];
+
+  if (PREDICT_FALSE (option_len > 0))
+    switch (option_len)
+      {
+      case 10:
+       sum += iphdr[14];
+      case 9:
+       sum += iphdr[13];
+      case 8:
+       sum += iphdr[12];
+      case 7:
+       sum += iphdr[11];
+      case 6:
+       sum += iphdr[10];
+      case 5:
+       sum += iphdr[9];
+      case 4:
+       sum += iphdr[8];
+      case 3:
+       sum += iphdr[7];
+      case 2:
+       sum += iphdr[6];
+      case 1:
+       sum += iphdr[5];
+      default:
+       break;
+      }
 
-  sum += clib_net_to_host_u16 (iphdr[0]);
-  sum += clib_net_to_host_u16 (iphdr[1]);
-  sum += clib_net_to_host_u16 (iphdr[2]);
-  sum += clib_net_to_host_u16 (iphdr[3]);
-  sum += clib_net_to_host_u16 (iphdr[4]);
+  sum = ((u32) sum) + (sum >> 32);
+#else
+  u16 *iphdr = (u16 *) i;
 
-  sum += clib_net_to_host_u16 (iphdr[6]);
-  sum += clib_net_to_host_u16 (iphdr[7]);
-  sum += clib_net_to_host_u16 (iphdr[8]);
-  sum += clib_net_to_host_u16 (iphdr[9]);
+  sum += iphdr[0];
+  sum += iphdr[1];
+  sum += iphdr[2];
+  sum += iphdr[3];
+  sum += iphdr[4];
+  if (with_checksum)
+    sum += iphdr[5];
+  sum += iphdr[6];
+  sum += iphdr[7];
+  sum += iphdr[8];
+  sum += iphdr[9];
 
   if (PREDICT_FALSE (option_len > 0))
     switch (option_len)
       {
       case 10:
-       sum += clib_net_to_host_u16 (iphdr[28]);
-       sum += clib_net_to_host_u16 (iphdr[29]);
+       sum += iphdr[28];
+       sum += iphdr[29];
       case 9:
-       sum += clib_net_to_host_u16 (iphdr[26]);
-       sum += clib_net_to_host_u16 (iphdr[27]);
+       sum += iphdr[26];
+       sum += iphdr[27];
       case 8:
-       sum += clib_net_to_host_u16 (iphdr[24]);
-       sum += clib_net_to_host_u16 (iphdr[25]);
+       sum += iphdr[24];
+       sum += iphdr[25];
       case 7:
-       sum += clib_net_to_host_u16 (iphdr[22]);
-       sum += clib_net_to_host_u16 (iphdr[23]);
+       sum += iphdr[22];
+       sum += iphdr[23];
       case 6:
-       sum += clib_net_to_host_u16 (iphdr[20]);
-       sum += clib_net_to_host_u16 (iphdr[21]);
+       sum += iphdr[20];
+       sum += iphdr[21];
       case 5:
-       sum += clib_net_to_host_u16 (iphdr[18]);
-       sum += clib_net_to_host_u16 (iphdr[19]);
+       sum += iphdr[18];
+       sum += iphdr[19];
       case 4:
-       sum += clib_net_to_host_u16 (iphdr[16]);
-       sum += clib_net_to_host_u16 (iphdr[17]);
+       sum += iphdr[16];
+       sum += iphdr[17];
       case 3:
-       sum += clib_net_to_host_u16 (iphdr[14]);
-       sum += clib_net_to_host_u16 (iphdr[15]);
+       sum += iphdr[14];
+       sum += iphdr[15];
       case 2:
-       sum += clib_net_to_host_u16 (iphdr[12]);
-       sum += clib_net_to_host_u16 (iphdr[13]);
+       sum += iphdr[12];
+       sum += iphdr[13];
       case 1:
-       sum += clib_net_to_host_u16 (iphdr[10]);
-       sum += clib_net_to_host_u16 (iphdr[11]);
+       sum += iphdr[10];
+       sum += iphdr[11];
       default:
        break;
       }
+#endif
 
   sum = ((u16) sum) + (sum >> 16);
   sum = ((u16) sum) + (sum >> 16);
-  return clib_host_to_net_u16 (~((u16) sum));
+  return ~((u16) sum);
+}
+
+/* *INDENT-OFF* */
+WARN_ON(array-bounds)
+/* *INDENT-ON* */
+
+always_inline u16
+ip4_header_checksum (ip4_header_t * i)
+{
+  return ip4_header_checksum_inline (i, /* with_checksum */ 0);
 }
 
 always_inline void
@@ -300,6 +359,18 @@ ip4_header_get_ecn (const ip4_header_t * ip4)
   return (ip4->tos & IP_PACKET_TC_FIELD_ECN_MASK);
 }
 
+always_inline u8
+ip4_header_get_ttl (const ip4_header_t *ip4)
+{
+  return (ip4->ttl);
+}
+
+always_inline void
+ip4_header_set_ttl (ip4_header_t *ip4, u8 ttl)
+{
+  ip4->ttl = ttl;
+}
+
 always_inline void
 ip4_header_set_df (ip4_header_t * ip4)
 {
@@ -324,7 +395,7 @@ ip4_header_get_df (const ip4_header_t * ip4)
 static inline uword
 ip4_header_checksum_is_valid (ip4_header_t * i)
 {
-  return i->checksum == ip4_header_checksum (i);
+  return ip4_header_checksum_inline (i, /* with_checksum */ 1) == 0;
 }
 
 #define ip4_partial_header_checksum_x1(ip0,sum0)                       \