mir/ovs
2
0
Fork 0
mirror of https://github.com/openvswitch/ovs synced 2025-09-05 08:45:23 +00:00
Code Issues Releases Wiki Activity

ofp-parse: New function parse_ofp_exact_flow().

Browse Source 
This function parses a flow rather than a cls_rule.  It will be useful
for "ofproto/trace", which currently requires an odp_flow and thus can't
accept values for registers and other concepts that don't exist in the
kernel.

Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2012-05-04 09:52:37 -07:00
parent 33cadc5034
commit ccbe50f8f6
4 changed files with 94 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
lib/ofp-parse.c
View File

@@ -755,3 +755,80 @@ parse_ofp_flow_stats_request_str(struct ofputil_flow_stats_request *fsr,
fsr->out_port = fm.out_port;
fsr->table_id = fm.table_id;
}
/* Parses a specification of a flow from 's' into 'flow'. 's' must take the
* form FIELD=VALUE[,FIELD=VALUE]... where each FIELD is the name of a
* mf_field. Fields must be specified in a natural order for satisfying
* prerequisites.
*
* Returns NULL on success, otherwise a malloc()'d string that explains the
* problem. */
char *
parse_ofp_exact_flow(struct flow *flow, const char *s)
{
char *pos, *key, *value_s;
char *error = NULL;
char *copy;
memset(flow, 0, sizeof *flow);
pos = copy = xstrdup(s);
while (ofputil_parse_key_value(&pos, &key, &value_s)) {
const struct protocol *p;
if (parse_protocol(key, &p)) {
if (flow->dl_type) {
error = xasprintf("%s: Ethernet type set multiple times", s);
goto exit;
}
flow->dl_type = htons(p->dl_type);
if (p->nw_proto) {
if (flow->nw_proto) {
error = xasprintf("%s: network protocol set "
"multiple times", s);
goto exit;
}
flow->nw_proto = p->nw_proto;
}
} else {
const struct mf_field *mf;
union mf_value value;
char *field_error;
mf = mf_from_name(key);
if (!mf) {
error = xasprintf("%s: unknown field %s", s, key);
goto exit;
}
if (!mf_are_prereqs_ok(mf, flow)) {
error = xasprintf("%s: prerequisites not met for setting %s",
s, key);
goto exit;
}
if (!mf_is_zero(mf, flow)) {
error = xasprintf("%s: field %s set multiple times", s, key);
goto exit;
}
field_error = mf_parse_value(mf, value_s, &value);
if (field_error) {
error = xasprintf("%s: bad value for %s (%s)",
s, key, field_error);
free(field_error);
goto exit;
}
mf_set_flow_value(mf, &value, flow);
}
}
exit:
free(copy);
if (error) {
memset(flow, 0, sizeof *flow);
}
return error;
}