X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fflow.c;h=678ae43090875c70ab4b27b77533ac155a13f9ba;hb=52ce26ee3b13496f65132996120e59ec29ab64c2;hp=22ffd1a4dfc976966edc14e525763c3b5f8861eb;hpb=d98e60075528c3065ad453f7add4b30f22edcde3;p=openvswitch

diff --git a/lib/flow.c b/lib/flow.c
index 22ffd1a4..678ae430 100644
--- a/lib/flow.c
+++ b/lib/flow.c
@@ -81,24 +81,24 @@ static void
 parse_vlan(struct ofpbuf *b, struct flow *flow)
 {
     struct qtag_prefix {
-        uint16_t eth_type;      /* ETH_TYPE_VLAN */
-        uint16_t tci;
+        ovs_be16 eth_type;      /* ETH_TYPE_VLAN */
+        ovs_be16 tci;
     };
 
-    if (b->size >= sizeof(struct qtag_prefix) + sizeof(uint16_t)) {
+    if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) {
         struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp);
         flow->dl_vlan = qp->tci & htons(VLAN_VID_MASK);
-        flow->dl_vlan_pcp = (ntohs(qp->tci) & VLAN_PCP_MASK) >> VLAN_PCP_SHIFT;
+        flow->dl_vlan_pcp = vlan_tci_to_pcp(qp->tci);
     }
 }
 
-static uint16_t
+static ovs_be16
 parse_ethertype(struct ofpbuf *b)
 {
     struct llc_snap_header *llc;
-    uint16_t proto;
+    ovs_be16 proto;
 
-    proto = *(uint16_t *) ofpbuf_pull(b, sizeof proto);
+    proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto);
     if (ntohs(proto) >= ODP_DL_TYPE_ETH2_CUTOFF) {
         return proto;
     }
@@ -120,10 +120,8 @@ parse_ethertype(struct ofpbuf *b)
     return llc->snap.snap_type;
 }
 
-/* 'tun_id' is in network byte order, while 'in_port' is in host byte order.
- * These byte orders are the same as they are in struct odp_flow_key.
- *
- * Initializes packet header pointers as follows:
+/* Initializes 'flow' members from 'packet', 'tun_id', and 'in_port.
+ * Initializes 'packet' header pointers as follows:
  *
  *    - packet->l2 to the start of the Ethernet header.
  *
@@ -138,7 +136,7 @@ parse_ethertype(struct ofpbuf *b)
  *      present and has a correct length, and otherwise NULL.
  */
 int
-flow_extract(struct ofpbuf *packet, uint32_t tun_id, uint16_t in_port,
+flow_extract(struct ofpbuf *packet, ovs_be32 tun_id, uint16_t in_port,
              struct flow *flow)
 {
     struct ofpbuf b = *packet;
@@ -252,12 +250,12 @@ flow_extract_stats(const struct flow *flow, struct ofpbuf *packet,
 }
 
 /* Extract 'flow' with 'wildcards' into the OpenFlow match structure
- * 'match'. */
+ * 'match'.  'flow_format' should be one of NXFF_*. */
 void
 flow_to_match(const struct flow *flow, uint32_t wildcards,
-              bool tun_id_from_cookie, struct ofp_match *match)
+              int flow_format, struct ofp_match *match)
 {
-    if (!tun_id_from_cookie) {
+    if (flow_format != NXFF_TUN_ID_FROM_COOKIE) {
         wildcards &= OFPFW_ALL;
     }
     match->wildcards = htonl(wildcards);
@@ -280,14 +278,14 @@ flow_to_match(const struct flow *flow, uint32_t wildcards,
 }
 
 void
-flow_from_match(const struct ofp_match *match, bool tun_id_from_cookie,
-                uint64_t cookie, struct flow *flow, uint32_t *flow_wildcards)
+flow_from_match(const struct ofp_match *match, int flow_format,
+                ovs_be64 cookie, struct flow *flow, uint32_t *flow_wildcards)
 {
 	uint32_t wildcards = ntohl(match->wildcards);
 
     flow->nw_src = match->nw_src;
     flow->nw_dst = match->nw_dst;
-    if (tun_id_from_cookie && !(wildcards & NXFW_TUN_ID)) {
+    if (flow_format == NXFF_TUN_ID_FROM_COOKIE && !(wildcards & NXFW_TUN_ID)) {
         flow->tun_id = htonl(ntohll(cookie) >> 32);
     } else {
         wildcards |= NXFW_TUN_ID;
@@ -350,3 +348,163 @@ flow_print(FILE *stream, const struct flow *flow)
     fputs(s, stream);
     free(s);
 }
+
+/* flow_wildcards functions. */
+
+/* Given the wildcard bit count in bits 'shift' through 'shift + 5' (inclusive)
+ * of 'wildcards', returns a 32-bit bit mask with a 1 in each bit that must
+ * match and a 0 in each bit that is wildcarded.
+ *
+ * The bits in 'wildcards' are in the format used in enum ofp_flow_wildcards: 0
+ * is exact match, 1 ignores the LSB, 2 ignores the 2 least-significant bits,
+ * ..., 32 and higher wildcard the entire field.  This is the *opposite* of the
+ * usual convention where e.g. /24 indicates that 8 bits (not 24 bits) are
+ * wildcarded. */
+ovs_be32
+flow_nw_bits_to_mask(uint32_t wildcards, int shift)
+{
+    wildcards = (wildcards >> shift) & 0x3f;
+    return wildcards < 32 ? htonl(~((1u << wildcards) - 1)) : 0;
+}
+
+/* Return 'wildcards' in "normal form":
+ *
+ *   - Forces unknown bits to 0.
+ *
+ *   - Forces nw_src and nw_dst masks greater than 32 to exactly 32.
+ */
+static inline uint32_t
+flow_wildcards_normalize(uint32_t wildcards)
+{
+    wildcards &= wildcards & OVSFW_ALL;
+    if (wildcards & (0x20 << OFPFW_NW_SRC_SHIFT)) {
+        wildcards &= ~(0x1f << OFPFW_NW_SRC_SHIFT);
+    }
+    if (wildcards & (0x20 << OFPFW_NW_DST_SHIFT)) {
+        wildcards &= ~(0x1f << OFPFW_NW_DST_SHIFT);
+    }
+    return wildcards;
+}
+
+/* Initializes 'wc' from 'wildcards', which may be any combination of the
+ * OFPFW_* and OVSFW_* wildcard bits. */
+void
+flow_wildcards_init(struct flow_wildcards *wc, uint32_t wildcards)
+{
+    wc->wildcards = flow_wildcards_normalize(wildcards);
+    wc->nw_src_mask = flow_nw_bits_to_mask(wc->wildcards, OFPFW_NW_SRC_SHIFT);
+    wc->nw_dst_mask = flow_nw_bits_to_mask(wc->wildcards, OFPFW_NW_DST_SHIFT);
+}
+
+/* Initializes 'wc' as an exact-match set of wildcards; that is, 'wc' does not
+ * wildcard any bits or fields. */
+void
+flow_wildcards_init_exact(struct flow_wildcards *wc)
+{
+    flow_wildcards_init(wc, 0);
+}
+
+static inline uint32_t
+combine_nw_bits(uint32_t wb1, uint32_t wb2, int shift)
+{
+    uint32_t sb1 = (wb1 >> shift) & 0x3f;
+    uint32_t sb2 = (wb2 >> shift) & 0x3f;
+    return MAX(sb1, sb2) << shift;
+}
+
+/* Initializes 'dst' as the combination of wildcards in 'src1' and 'src2'.
+ * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded in
+ * 'src1' or 'src2' or both.  */
+void
+flow_wildcards_combine(struct flow_wildcards *dst,
+                       const struct flow_wildcards *src1,
+                       const struct flow_wildcards *src2)
+{
+    uint32_t wb1 = src1->wildcards;
+    uint32_t wb2 = src2->wildcards;
+
+    dst->wildcards = (wb1 | wb2) & ~(OFPFW_NW_SRC_MASK | OFPFW_NW_DST_MASK);
+    dst->wildcards |= combine_nw_bits(wb1, wb2, OFPFW_NW_SRC_SHIFT);
+    dst->wildcards |= combine_nw_bits(wb1, wb2, OFPFW_NW_DST_SHIFT);
+    dst->nw_src_mask = src1->nw_src_mask & src2->nw_src_mask;
+    dst->nw_dst_mask = src1->nw_dst_mask & src2->nw_dst_mask;
+}
+
+/* Returns a hash of the wildcards in 'wc'. */
+uint32_t
+flow_wildcards_hash(const struct flow_wildcards *wc)
+{
+    /* There is no need to include nw_src_mask or nw_dst_mask because they do
+     * not add any information (they can be computed from wc->wildcards).  */
+    return hash_int(wc->wildcards, 0);
+}
+
+/* Returns true if 'a' and 'b' represent the same wildcards, false if they are
+ * different. */
+bool
+flow_wildcards_equal(const struct flow_wildcards *a,
+                     const struct flow_wildcards *b)
+{
+    return a->wildcards == b->wildcards;
+}
+
+/* Returns true if at least one bit or field is wildcarded in 'a' but not in
+ * 'b', false otherwise. */
+bool
+flow_wildcards_has_extra(const struct flow_wildcards *a,
+                         const struct flow_wildcards *b)
+{
+#define OFPFW_NW_MASK (OFPFW_NW_SRC_MASK | OFPFW_NW_DST_MASK)
+    return ((a->wildcards & ~(b->wildcards | OFPFW_NW_MASK))
+            || (a->nw_src_mask & b->nw_src_mask) != b->nw_src_mask
+            || (a->nw_dst_mask & b->nw_dst_mask) != b->nw_dst_mask);
+}
+
+static int
+count_ones(ovs_be32 mask)
+{
+#if __GNUC__ >= 4
+    return __builtin_popcount(mask);
+#else
+    int bits;
+
+    for (bits = 0; mask; bits++) {
+        mask &= mask - 1;
+    }
+
+    return bits;
+#endif
+}
+
+static bool
+set_nw_mask(struct flow_wildcards *wc, ovs_be32 mask,
+            ovs_be32 *maskp, int shift)
+{
+    int wcbits = 32 - count_ones(mask);
+    if (flow_nw_bits_to_mask(wcbits, 0) == mask) {
+        wc->wildcards &= ~(0x3f << shift);
+        wc->wildcards |= wcbits << shift;
+        *maskp = mask;
+        return true;
+    } else {
+        return false;
+    }
+}
+
+/* Sets the IP (or ARP) source wildcard mask to CIDR 'mask' (consisting of N
+ * high-order 1-bit and 32-N low-order 0-bits).  Returns true if successful,
+ * false if 'mask' is not a CIDR mask.  */
+bool
+flow_wildcards_set_nw_src_mask(struct flow_wildcards *wc, ovs_be32 mask)
+{
+    return set_nw_mask(wc, mask, &wc->nw_src_mask, OFPFW_NW_SRC_SHIFT);
+}
+
+/* Sets the IP (or ARP) destination wildcard mask to CIDR 'mask' (consisting of
+ * N high-order 1-bit and 32-N low-order 0-bits).  Returns true if successful,
+ * false if 'mask' is not a CIDR mask.  */
+bool
+flow_wildcards_set_nw_dst_mask(struct flow_wildcards *wc, ovs_be32 mask)
+{
+    return set_nw_mask(wc, mask, &wc->nw_dst_mask, OFPFW_NW_DST_SHIFT);
+}