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pathd: If pce ret no-path to PcReq don't retry PcReq nor delegate(1/2)

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Based in RFC 5440 @4.2.2 ""...after a no-path , the pcc may decide" and RFC
8231 #5.8.3 "... pcc must not set PcReq after path is delegated"

So will not (try) to delegate the path with no-path neither must do
further retries.

Signed-off-by: Javier Garcia <javier.garcia@voltanet.io>
This commit is contained in:
Javier Garcia 2021-06-23 09:23:52 +02:00
parent 3d9dffbe7e
commit 0a1bf4be7f
1 changed files with 51 additions and 1 deletions
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52
pathd/path_pcep_pcc.c
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@ -128,6 +128,8 @@ static struct req_entry *push_new_req(struct pcc_state *pcc_state,
struct path *path);
static void repush_req(struct pcc_state *pcc_state, struct req_entry *req);
static struct req_entry *pop_req(struct pcc_state *pcc_state, uint32_t reqid);
static struct req_entry *pop_req_no_reqid(struct pcc_state *pcc_state,
uint32_t reqid);
static bool add_reqid_mapping(struct pcc_state *pcc_state, struct path *path);
static void remove_reqid_mapping(struct pcc_state *pcc_state,
struct path *path);
@ -1340,7 +1342,11 @@ void handle_pcep_comp_reply(struct ctrl_state *ctrl_state,
struct path *path;
path = pcep_lib_parse_path(msg);
req = pop_req(pcc_state, path->req_id);
if (path->no_path) {
req = pop_req_no_reqid(pcc_state, path->req_id);
} else {
req = pop_req(pcc_state, path->req_id);
}
if (req == NULL) {
/* TODO: check the rate of bad computation reply and close
* the connection if more that a given rate.
@ -1372,6 +1378,9 @@ void handle_pcep_comp_reply(struct ctrl_state *ctrl_state,
if (path->no_path) {
PCEP_DEBUG("%s Computation for path %s did not find any result",
pcc_state->tag, path->name);
free_req_entry(req);
pcep_free_path(path);
return;
} else if (validate_incoming_path(pcc_state, path, err, sizeof(err))) {
/* Updating a dynamic path will automatically delegate it */
pcep_thread_update_path(ctrl_state, pcc_state->id, path);
@ -1847,6 +1856,20 @@ struct req_entry *pop_req(struct pcc_state *pcc_state, uint32_t reqid)
return req;
}
struct req_entry *pop_req_no_reqid(struct pcc_state *pcc_state, uint32_t reqid)
{
struct path path = {.req_id = reqid};
struct req_entry key = {.path = &path};
struct req_entry *req;
req = RB_FIND(req_entry_head, &pcc_state->requests, &key);
if (req == NULL)
return NULL;
RB_REMOVE(req_entry_head, &pcc_state->requests, req);
return req;
}
bool add_reqid_mapping(struct pcc_state *pcc_state, struct path *path)
{
struct req_map_data *mapping;
@ -1883,6 +1906,33 @@ uint32_t lookup_reqid(struct pcc_state *pcc_state, struct path *path)
bool has_pending_req_for(struct pcc_state *pcc_state, struct path *path)
{
struct req_entry key = {.path = path};
struct req_entry *req;
PCEP_DEBUG_PATH("(%s) %s", format_path(path), __func__);
/* Looking for request without result */
if (path->no_path || !path->first_hop) {
PCEP_DEBUG_PATH("%s Path : no_path|!first_hop", __func__);
/* ...and already was handle */
req = RB_FIND(req_entry_head, &pcc_state->requests, &key);
if (!req) {
/* we must purge remaining reqid */
PCEP_DEBUG_PATH("%s Purge pending reqid: no_path(%s)",
__func__,
path->no_path ? "TRUE" : "FALSE");
if (lookup_reqid(pcc_state, path) != 0) {
PCEP_DEBUG_PATH("%s Purge pending reqid: DONE ",
__func__);
remove_reqid_mapping(pcc_state, path);
return true;
} else {
return false;
}
}
}
return lookup_reqid(pcc_state, path) != 0;
}