/*
- * Copyright (c) 2009, 2010 Nicira Networks.
+ * Copyright (c) 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
compose_benign_packet(struct ofpbuf *b, const char *tag, uint16_t snap_type,
const uint8_t eth_src[ETH_ADDR_LEN])
{
- struct eth_header *eth;
- struct llc_snap_header *llc_snap;
+ size_t tag_size = strlen(tag) + 1;
+ char *payload;
- /* Compose basic packet structure. (We need the payload size to stick into
- * the 802.2 header.) */
- ofpbuf_clear(b);
- eth = ofpbuf_put_zeros(b, ETH_HEADER_LEN);
- llc_snap = ofpbuf_put_zeros(b, LLC_SNAP_HEADER_LEN);
- ofpbuf_put(b, tag, strlen(tag) + 1); /* Includes null byte. */
- ofpbuf_put(b, eth_src, ETH_ADDR_LEN);
+ payload = snap_compose(b, eth_addr_broadcast, eth_src, 0x002320, snap_type,
+ tag_size + ETH_ADDR_LEN);
+ memcpy(payload, tag, tag_size);
+ memcpy(payload + tag_size, eth_src, ETH_ADDR_LEN);
+}
- /* Compose 802.2 header. */
- memcpy(eth->eth_dst, eth_addr_broadcast, ETH_ADDR_LEN);
- memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
- eth->eth_type = htons(b->size - ETH_HEADER_LEN);
+/* Modify the TCI field of 'packet', whose data must begin with an Ethernet
+ * header. If a VLAN tag is present, its TCI field is replaced by 'tci'. If a
+ * VLAN tag is not present, one is added with the TCI field set to 'tci'.
+ *
+ * Also sets 'packet->l2' to point to the new Ethernet header. */
+void
+eth_set_vlan_tci(struct ofpbuf *packet, ovs_be16 tci)
+{
+ struct eth_header *eh = packet->data;
+ struct vlan_eth_header *veh;
- /* Compose LLC, SNAP headers. */
- llc_snap->llc.llc_dsap = LLC_DSAP_SNAP;
- llc_snap->llc.llc_ssap = LLC_SSAP_SNAP;
- llc_snap->llc.llc_cntl = LLC_CNTL_SNAP;
- memcpy(llc_snap->snap.snap_org, "\x00\x23\x20", 3);
- llc_snap->snap.snap_type = htons(snap_type);
+ if (packet->size >= sizeof(struct vlan_eth_header)
+ && eh->eth_type == htons(ETH_TYPE_VLAN)) {
+ veh = packet->data;
+ veh->veth_tci = tci;
+ } else {
+ /* Insert new 802.1Q header. */
+ struct vlan_eth_header tmp;
+ memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN);
+ memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN);
+ tmp.veth_type = htons(ETH_TYPE_VLAN);
+ tmp.veth_tci = tci;
+ tmp.veth_next_type = eh->eth_type;
+
+ veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN);
+ memcpy(veh, &tmp, sizeof tmp);
+ }
+ packet->l2 = packet->data;
}
/* Stores the string representation of the IPv6 address 'addr' into the
return count;
}
-
/* Returns true if 'netmask' is a CIDR netmask, that is, if it consists of N
* high-order 1-bits and 128-N low-order 0-bits. */
bool
return true;
}
+
+/* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst',
+ * 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated
+ * in 'b' and returned. This payload may be populated with appropriate
+ * information by the caller.
+ *
+ * The returned packet has enough headroom to insert an 802.1Q VLAN header if
+ * desired. */
+void *
+eth_compose(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;
+
+ ofpbuf_clear(b);
+
+ ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN + size);
+ ofpbuf_reserve(b, VLAN_HEADER_LEN);
+ eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN);
+ data = ofpbuf_put_uninit(b, size);
+
+ memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
+ memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
+ eth->eth_type = htons(eth_type);
+
+ return data;
+}
+
+/* Populates 'b' with an Ethernet LLC+SNAP packet headed with the given
+ * 'eth_dst', 'eth_src', 'snap_org', and 'snap_type'. A payload of 'size'
+ * bytes is allocated in 'b' and returned. This payload may be populated with
+ * appropriate information by the caller.
+ *
+ * The returned packet has enough headroom to insert an 802.1Q VLAN header if
+ * desired. */
+void *
+snap_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
+ const uint8_t eth_src[ETH_ADDR_LEN],
+ unsigned int oui, uint16_t snap_type, size_t size)
+{
+ struct eth_header *eth;
+ struct llc_snap_header *llc_snap;
+ void *payload;
+
+ /* Compose basic packet structure. (We need the payload size to stick into
+ * the 802.2 header.) */
+ ofpbuf_clear(b);
+ ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN
+ + LLC_SNAP_HEADER_LEN + size);
+ ofpbuf_reserve(b, VLAN_HEADER_LEN);
+ eth = ofpbuf_put_zeros(b, ETH_HEADER_LEN);
+ llc_snap = ofpbuf_put_zeros(b, LLC_SNAP_HEADER_LEN);
+ payload = ofpbuf_put_uninit(b, size);
+
+ /* Compose 802.2 header. */
+ memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
+ memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
+ eth->eth_type = htons(b->size - ETH_HEADER_LEN);
+
+ /* Compose LLC, SNAP headers. */
+ llc_snap->llc.llc_dsap = LLC_DSAP_SNAP;
+ llc_snap->llc.llc_ssap = LLC_SSAP_SNAP;
+ llc_snap->llc.llc_cntl = LLC_CNTL_SNAP;
+ llc_snap->snap.snap_org[0] = oui >> 16;
+ llc_snap->snap.snap_org[1] = oui >> 8;
+ llc_snap->snap.snap_org[2] = oui;
+ llc_snap->snap.snap_type = htons(snap_type);
+
+ return payload;
+}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff