X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fpackets.c;h=6ee7aa83ecbbefdff365e31b4681ccbb770f7eaa;hb=b0421aa20c401c8503946a102428d0a4adb976f9;hp=8791a3ce09a244b20719a484a23d30eeaa191d21;hpb=8834f25e9983910258cd0cd1e400a14d9a664479;p=openvswitch

diff --git a/lib/packets.c b/lib/packets.c
index 8791a3ce..6ee7aa83 100644
--- a/lib/packets.c
+++ b/lib/packets.c
@@ -204,25 +204,37 @@ ipv6_is_cidr(const struct in6_addr *netmask)
     return true;
 }
 
-/* Fills 'b' with a LACP packet whose source address is 'eth_src', LACP actor
- * information is 'actor', and LACP partner information is 'partner'. */
-void
-compose_lacp_packet(struct ofpbuf *b, struct lacp_info *actor,
-                    struct lacp_info *partner,
-                    const uint8_t eth_src[ETH_ADDR_LEN])
+/* Populates 'b' with an L2 packet headed with the given 'eth_dst', 'eth_src'
+ * and 'eth_type' paramaters.  A payload of 'size' bytes is allocated in 'b'
+ * and returned.  This payload may be populated with appropriate information by
+ * the caller. */
+void *
+compose_packet(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
+               const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type,
+               size_t size)
 {
+    void *data;
     struct eth_header *eth;
-    struct lacp_pdu *pdu;
 
     ofpbuf_clear(b);
 
-    ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + LACP_PDU_LEN);
-    eth = ofpbuf_put_zeros(b, ETH_HEADER_LEN);
-    pdu = ofpbuf_put_zeros(b, LACP_PDU_LEN);
+    ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + size);
+    eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN);
+    data = ofpbuf_put_uninit(b, size);
 
-    memcpy(eth->eth_dst, eth_addr_lacp, ETH_ADDR_LEN);
+    memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
     memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
-    eth->eth_type = htons(ETH_TYPE_LACP);
+    eth->eth_type = htons(eth_type);
+
+    return data;
+}
+
+/* Populates 'pdu' with a LACP PDU comprised of 'actor' and 'partner'. */
+void
+compose_lacp_pdu(const struct lacp_info *actor,
+                 const struct lacp_info *partner, struct lacp_pdu *pdu)
+{
+    memset(pdu, 0, sizeof *pdu);
 
     pdu->subtype = 1;
     pdu->version = 1;