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vswitchd: Implement Link Aggregation Control Protocol.

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This commit implements LACP, a protocol which allows directly
connected switches to automatically negotiate which links may
participate in bonds.  This commit disables LACP by default.  Once
sufficiently tested, LACP will be enabled in "active" mode on
bonded ports, and "passive" mode on all others.

Bug #4213.
This commit is contained in:
Ethan Jackson
2011-01-18 18:46:58 -08:00
parent c835c3bf87
commit c25c91fd5e
5 changed files with 717 additions and 29 deletions
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56
lib/packets.c
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@@ -203,3 +203,59 @@ 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])
{
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);
memcpy(eth->eth_dst, eth_addr_lacp, ETH_ADDR_LEN);
memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
eth->eth_type = htons(ETH_TYPE_LACP);
pdu->subtype = 1;
pdu->version = 1;
pdu->actor_type = 1;
pdu->actor_len = 20;
pdu->actor = *actor;
pdu->partner_type = 2;
pdu->partner_len = 20;
pdu->partner = *partner;
pdu->collector_type = 3;
pdu->collector_len = 16;
pdu->collector_delay = htons(UINT16_MAX);
}
/* Parses 'b' which represents a packet containing a LACP PDU. This function
* returns NULL if 'b' is malformed, or does not represent a LACP PDU format
* supported by OVS. Otherwise, it returns a pointer to the lacp_pdu contained
* within 'b'. */
const struct lacp_pdu *
parse_lacp_packet(const struct ofpbuf *b)
{
const struct lacp_pdu *pdu;
pdu = ofpbuf_at(b, (uint8_t *)b->l3 - (uint8_t *)b->data, LACP_PDU_LEN);
if (pdu && pdu->subtype == 1
&& pdu->actor_type == 1 && pdu->actor_len == 20
&& pdu->partner_type == 2 && pdu->partner_len == 20) {
return pdu;
} else {
return NULL;
}
}