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packets: Create new compose_packet() function.

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This commit generalizes compose_lacp_packet() into new
compose_packet() function.  This new function will be used to send
CCM messages in future patches.
This commit is contained in:
Ethan Jackson
2011-03-23 12:59:40 -07:00
parent 15df7ea8d9
commit 40f78b38e7
3 changed files with 26 additions and 16 deletions
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27
lib/packets.c
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@@ -204,24 +204,29 @@ ipv6_is_cidr(const struct in6_addr *netmask)
return true;
}
/* Populates 'b' with a LACP packet containing 'pdu' with source address
* 'eth_src'. */
void
compose_lacp_packet(struct ofpbuf *b, const uint8_t eth_src[ETH_ADDR_LEN],
const struct lacp_pdu *pdu)
/* 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 *eth_pdu;
ofpbuf_clear(b);
ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + LACP_PDU_LEN);
eth = ofpbuf_put_zeros(b, ETH_HEADER_LEN);
eth_pdu = ofpbuf_put(b, pdu, 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'. */