[ovs-dev] [bug 7759 02/11] netlink: New macros NL_NESTED_FOR_EACH, NL_NESTED_FOR_EACH_UNSAFE.
Ben Pfaff
blp at nicira.com
Wed Oct 5 18:27:37 UTC 2011
Upcoming commits will introduce more users.
---
lib/netlink-socket.c | 6 ++----
lib/netlink.h | 6 ++++++
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/lib/netlink-socket.c b/lib/netlink-socket.c
index 0f4e3e7..160edd2 100644
--- a/lib/netlink-socket.c
+++ b/lib/netlink-socket.c
@@ -790,9 +790,8 @@ nl_lookup_genl_mcgroup(const char *family_name, const char *group_name,
unsigned int *multicast_group, unsigned int fallback)
{
struct nlattr *family_attrs[ARRAY_SIZE(family_policy)];
- struct ofpbuf all_mcs;
+ const struct nlattr *mc;
struct ofpbuf *reply;
- struct nlattr *mc;
unsigned int left;
int error;
@@ -810,8 +809,7 @@ nl_lookup_genl_mcgroup(const char *family_name, const char *group_name,
goto exit;
}
- nl_attr_get_nested(family_attrs[CTRL_ATTR_MCAST_GROUPS], &all_mcs);
- NL_ATTR_FOR_EACH (mc, left, all_mcs.data, all_mcs.size) {
+ NL_NESTED_FOR_EACH (mc, left, family_attrs[CTRL_ATTR_MCAST_GROUPS]) {
static const struct nl_policy mc_policy[] = {
[CTRL_ATTR_MCAST_GRP_ID] = {.type = NL_A_U32},
[CTRL_ATTR_MCAST_GRP_NAME] = {.type = NL_A_STRING},
diff --git a/lib/netlink.h b/lib/netlink.h
index 2206339..2d34571 100644
--- a/lib/netlink.h
+++ b/lib/netlink.h
@@ -124,6 +124,12 @@ nl_attr_is_valid(const struct nlattr *nla, size_t maxlen)
(LEFT) > 0; \
(LEFT) -= NLA_ALIGN((ITER)->nla_len), (ITER) = nl_attr_next(ITER))
+/* These variants are convenient for iterating nested attributes. */
+#define NL_NESTED_FOR_EACH(ITER, LEFT, A) \
+ NL_ATTR_FOR_EACH(ITER, LEFT, nl_attr_get(A), nl_attr_get_size(A))
+#define NL_NESTED_FOR_EACH_UNSAFE(ITER, LEFT, A) \
+ NL_ATTR_FOR_EACH_UNSAFE(ITER, LEFT, nl_attr_get(A), nl_attr_get_size(A))
+
/* Netlink attribute parsing. */
int nl_attr_type(const struct nlattr *);
const void *nl_attr_get(const struct nlattr *);
--
1.7.2.5
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