/*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include "netlink-protocol.h"
#include "ofpbuf.h"
#include "timeval.h"
+#include "unaligned.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(netlink);
nl_msg_put_unspec(msg, type, &value, sizeof value);
}
-/* Appends a Netlink attribute of the given 'type' and the given 16-bit 'value'
- * to 'msg'. */
+/* Appends a Netlink attribute of the given 'type' and the given 16-bit host
+ * byte order 'value' to 'msg'. */
void
nl_msg_put_u16(struct ofpbuf *msg, uint16_t type, uint16_t value)
{
nl_msg_put_unspec(msg, type, &value, sizeof value);
}
-/* Appends a Netlink attribute of the given 'type' and the given 32-bit 'value'
- * to 'msg'. */
+/* Appends a Netlink attribute of the given 'type' and the given 32-bit host
+ * byte order 'value' to 'msg'. */
void
nl_msg_put_u32(struct ofpbuf *msg, uint16_t type, uint32_t value)
{
nl_msg_put_unspec(msg, type, &value, sizeof value);
}
-/* Appends a Netlink attribute of the given 'type' and the given 64-bit 'value'
- * to 'msg'. */
+/* Appends a Netlink attribute of the given 'type' and the given 64-bit host
+ * byte order 'value' to 'msg'. */
void
nl_msg_put_u64(struct ofpbuf *msg, uint16_t type, uint64_t value)
{
nl_msg_put_unspec(msg, type, &value, sizeof value);
}
+/* Appends a Netlink attribute of the given 'type' and the given 16-bit network
+ * byte order 'value' to 'msg'. */
+void
+nl_msg_put_be16(struct ofpbuf *msg, uint16_t type, ovs_be16 value)
+{
+ nl_msg_put_unspec(msg, type, &value, sizeof value);
+}
+
+/* Appends a Netlink attribute of the given 'type' and the given 32-bit network
+ * byte order 'value' to 'msg'. */
+void
+nl_msg_put_be32(struct ofpbuf *msg, uint16_t type, ovs_be32 value)
+{
+ nl_msg_put_unspec(msg, type, &value, sizeof value);
+}
+
+/* Appends a Netlink attribute of the given 'type' and the given 64-bit network
+ * byte order 'value' to 'msg'. */
+void
+nl_msg_put_be64(struct ofpbuf *msg, uint16_t type, ovs_be64 value)
+{
+ nl_msg_put_unspec(msg, type, &value, sizeof value);
+}
+
/* Appends a Netlink attribute of the given 'type' and the given
* null-terminated string 'value' to 'msg'. */
void
\f
/* Attributes. */
+/* Returns the bits of 'nla->nla_type' that are significant for determining its
+ * type. */
+int
+nl_attr_type(const struct nlattr *nla)
+{
+ return nla->nla_type & NLA_TYPE_MASK;
+}
+
/* Returns the first byte in the payload of attribute 'nla'. */
const void *
nl_attr_get(const struct nlattr *nla)
return NL_ATTR_GET_AS(nla, uint8_t);
}
-/* Returns the 16-bit value in 'nla''s payload.
+/* Returns the 16-bit host byte order value in 'nla''s payload.
*
* Asserts that 'nla''s payload is at least 2 bytes long. */
uint16_t
return NL_ATTR_GET_AS(nla, uint16_t);
}
-/* Returns the 32-bit value in 'nla''s payload.
+/* Returns the 32-bit host byte order value in 'nla''s payload.
*
* Asserts that 'nla''s payload is at least 4 bytes long. */
uint32_t
return NL_ATTR_GET_AS(nla, uint32_t);
}
-/* Returns the 64-bit value in 'nla''s payload.
+/* Returns the 64-bit host byte order value in 'nla''s payload.
*
* Asserts that 'nla''s payload is at least 8 bytes long. */
uint64_t
nl_attr_get_u64(const struct nlattr *nla)
{
- return NL_ATTR_GET_AS(nla, uint64_t);
+ const ovs_32aligned_u64 *x = nl_attr_get_unspec(nla, sizeof *x);
+ return get_32aligned_u64(x);
+}
+
+/* Returns the 16-bit network byte order value in 'nla''s payload.
+ *
+ * Asserts that 'nla''s payload is at least 2 bytes long. */
+ovs_be16
+nl_attr_get_be16(const struct nlattr *nla)
+{
+ return NL_ATTR_GET_AS(nla, ovs_be16);
+}
+
+/* Returns the 32-bit network byte order value in 'nla''s payload.
+ *
+ * Asserts that 'nla''s payload is at least 4 bytes long. */
+ovs_be32
+nl_attr_get_be32(const struct nlattr *nla)
+{
+ return NL_ATTR_GET_AS(nla, ovs_be32);
+}
+
+/* Returns the 64-bit network byte order value in 'nla''s payload.
+ *
+ * Asserts that 'nla''s payload is at least 8 bytes long. */
+ovs_be64
+nl_attr_get_be64(const struct nlattr *nla)
+{
+ const ovs_32aligned_be64 *x = nl_attr_get_unspec(nla, sizeof *x);
+ return get_32aligned_be64(x);
}
/* Returns the null-terminated string value in 'nla''s payload.
if (aligned_len > (char*)tail - (char*)p) {
VLOG_DBG_RL(&rl, "%zu: attr %"PRIu16" aligned data len (%zu) "
"> bytes left (%tu)",
- offset, nla->nla_type, aligned_len,
+ offset, nl_attr_type(nla), aligned_len,
(char*)tail - (char*)p);
return false;
}
- type = nla->nla_type;
+ type = nl_attr_type(nla);
if (type < n_attrs && policy[type].type != NL_A_NO_ATTR) {
const struct nl_policy *e = &policy[type];
size_t min_len, max_len;
assert(n_required > 0);
--n_required;
}
+ if (attrs[type]) {
+ VLOG_DBG_RL(&rl, "%zu: duplicate attr %"PRIu16, offset, type);
+ }
attrs[type] = nla;
} else {
/* Skip attribute type that we don't care about. */
nl_attr_get_nested(nla, &buf);
return nl_policy_parse(&buf, 0, policy, attrs, n_attrs);
}
+
+static const struct nlattr *
+nl_attr_find__(const struct nlattr *attrs, size_t size, uint16_t type)
+{
+ const struct nlattr *nla;
+ size_t left;
+
+ NL_ATTR_FOR_EACH (nla, left, attrs, size) {
+ if (nl_attr_type (nla) == type) {
+ return nla;
+ }
+ }
+ return NULL;
+}
+
+/* Returns the first Netlink attribute within 'buf' with the specified 'type',
+ * skipping a header of 'hdr_len' bytes at the beginning of 'buf'.
+ *
+ * This function does not validate the attribute's length. */
+const struct nlattr *
+nl_attr_find(const struct ofpbuf *buf, size_t hdr_len, uint16_t type)
+{
+ const uint8_t *start = (const uint8_t *) buf->data + hdr_len;
+ return nl_attr_find__((const struct nlattr *) start, buf->size - hdr_len,
+ type);
+}
+
+/* Returns the first Netlink attribute within 'nla' with the specified
+ * 'type'.
+ *
+ * This function does not validate the attribute's length. */
+const struct nlattr *
+nl_attr_find_nested(const struct nlattr *nla, uint16_t type)
+{
+ return nl_attr_find__(nl_attr_get(nla), nl_attr_get_size(nla), type);
+}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff