Replace most uses of assert by ovs_assert.

[sliver-openvswitch.git] / lib / flow.c

diff --git a/lib/flow.c b/lib/flow.c
index d511fd8..861a1f1 100644 (file)
--- a/lib/flow.c
+++ b/lib/flow.c
@@ -16,7 +16,6 @@
 #include <config.h>
 #include <sys/types.h>
 #include "flow.h"
-#include <assert.h>
 #include <errno.h>
 #include <inttypes.h>
 #include <limits.h>
@@ -347,7 +346,7 @@ flow_extract(struct ofpbuf *packet, uint32_t skb_priority, uint32_t skb_mark,
     memset(flow, 0, sizeof *flow);
 
     if (tnl) {
-        assert(tnl != &flow->tunnel);
+        ovs_assert(tnl != &flow->tunnel);
         flow->tunnel = *tnl;
     }
     flow->in_port = ofp_in_port;
@@ -375,9 +374,33 @@ flow_extract(struct ofpbuf *packet, uint32_t skb_priority, uint32_t skb_mark,
     }
     flow->dl_type = parse_ethertype(&b);
 
-    /* Network layer. */
     packet->l3 = b.data;
-    if (flow->dl_type == htons(ETH_TYPE_IP)) {
+    flow_extract_l3_onwards(packet, flow, flow->dl_type);
+}
+
+/* Initializes l3 and higher 'flow' members from 'packet'
+ *
+ * This should be called by or after flow_extract()
+ *
+ * Initializes 'packet' header pointers as follows:
+ *
+ *    - packet->l4 to just past the IPv4 header, if one is present and has a
+ *      correct length, and otherwise NULL.
+ *
+ *    - packet->l7 to just past the TCP or UDP or ICMP header, if one is
+ *      present and has a correct length, and otherwise NULL.
+ */
+void
+flow_extract_l3_onwards(struct ofpbuf *packet, struct flow *flow,
+                        ovs_be16 dl_type)
+{
+    struct ofpbuf b;
+
+    ofpbuf_use_const(&b, packet->l3, packet->size -
+                     (size_t)((char *)packet->l3 - (char *)packet->l2));
+
+    /* Network layer. */
+    if (dl_type == htons(ETH_TYPE_IP)) {
         const struct ip_header *nh = pull_ip(&b);
         if (nh) {
             packet->l4 = b.data;
@@ -410,7 +433,7 @@ flow_extract(struct ofpbuf *packet, uint32_t skb_priority, uint32_t skb_mark,
                 }
             }
         }
-    } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
+    } else if (dl_type == htons(ETH_TYPE_IPV6)) {
         if (parse_ipv6(&b, flow)) {
             return;
         }
@@ -425,8 +448,8 @@ flow_extract(struct ofpbuf *packet, uint32_t skb_priority, uint32_t skb_mark,
                 packet->l7 = b.data;
             }
         }
-    } else if (flow->dl_type == htons(ETH_TYPE_ARP) ||
-               flow->dl_type == htons(ETH_TYPE_RARP)) {
+    } else if (dl_type == htons(ETH_TYPE_ARP) ||
+               dl_type == htons(ETH_TYPE_RARP)) {
         const struct arp_eth_header *arp = pull_arp(&b);
         if (arp && arp->ar_hrd == htons(1)
             && arp->ar_pro == htons(ETH_TYPE_IP)
@@ -596,7 +619,7 @@ flow_wildcards_combine(struct flow_wildcards *dst,
 uint32_t
 flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis)
 {
-    return flow_hash(&wc->masks, basis);;
+    return flow_hash(&wc->masks, basis);
 }
 
 /* Returns true if 'a' and 'b' represent the same wildcards, false if they are