X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fpackets.h;h=39e88f1f571b35c28c5e2de5cba02388eda50ac3;hb=eb9b830766044475277a590dbf8d213b77b62188;hp=af028ebfcbe3cc2a859fe622edf02ad6adef443a;hpb=26233bb4615608fd45d89a5abe2e62f4b3d776f7;p=openvswitch

diff --git a/lib/packets.h b/lib/packets.h
index af028ebf..39e88f1f 100644
--- a/lib/packets.h
+++ b/lib/packets.h
@@ -23,6 +23,7 @@
 #include <stdint.h>
 #include <string.h>
 #include "compiler.h"
+#include "openvswitch/types.h"
 #include "random.h"
 #include "util.h"
 
@@ -152,6 +153,7 @@ void compose_benign_packet(struct ofpbuf *, const char *tag,
 #define ETH_TYPE_IP            0x0800
 #define ETH_TYPE_ARP           0x0806
 #define ETH_TYPE_VLAN          0x8100
+#define ETH_TYPE_CFM           0x8902
 
 #define ETH_HEADER_LEN 14
 #define ETH_PAYLOAD_MIN 46
@@ -235,6 +237,23 @@ struct vlan_eth_header {
 } __attribute__((packed));
 BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header));
 
+/* A 'ccm' represents a Continuity Check Message from the 802.1ag specification.
+ * Continuity Check Messages are broadcast periodically so that hosts can
+ * determine who they have connectivity to. */
+#define CCM_LEN 74
+#define CCM_MAID_LEN 48
+struct ccm {
+    uint8_t  mdlevel_version; /* MD Level and Version */
+    uint8_t  opcode;
+    uint8_t  flags;
+    uint8_t  tlv_offset;
+    uint32_t seq;
+    uint16_t mpid;
+    uint8_t  maid[CCM_MAID_LEN];
+    uint8_t  zero[16]; /* Defined by ITU-T Y.1731 should be zero */
+} __attribute__((packed));
+BUILD_ASSERT_DECL(CCM_LEN == sizeof(struct ccm));
+
 /* The "(void) (ip)[0]" below has no effect on the value, since it's the first
  * argument of a comma expression, but it makes sure that 'ip' is a pointer.
  * This is useful since a common mistake is to pass an integer instead of a
@@ -246,6 +265,15 @@ BUILD_ASSERT_DECL(VLAN_ETH_HEADER_LEN == sizeof(struct vlan_eth_header));
         ((uint8_t *) ip)[2],                    \
         ((uint8_t *) ip)[3]
 
+/* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N
+ * high-order 1-bits and 32-N low-order 0-bits. */
+static inline bool
+ip_is_cidr(ovs_be32 netmask)
+{
+    uint32_t x = ~ntohl(netmask);
+    return !(x & (x + 1));
+}
+
 #define IP_VER(ip_ihl_ver) ((ip_ihl_ver) >> 4)
 #define IP_IHL(ip_ihl_ver) ((ip_ihl_ver) & 15)
 #define IP_IHL_VER(ihl, ver) (((ver) << 4) | (ihl))