#ifndef __NET_NETLINK_WRAPPER_H
#define __NET_NETLINK_WRAPPER_H 1
+#include <linux/version.h>
#include_next <net/netlink.h>
-#ifndef HAVE_NLA_NUL_STRING
-#define NLA_NUL_STRING NLA_STRING
-
-static inline int VERIFY_NUL_STRING(struct nlattr *attr)
-{
- return (!attr || (nla_len(attr)
- && memchr(nla_data(attr), '\0', nla_len(attr)))
- ? 0 : EINVAL);
-}
-#else
-static inline int VERIFY_NUL_STRING(struct nlattr *attr)
-{
- return 0;
-}
-#endif /* !HAVE_NLA_NUL_STRING */
-
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
+/* Before v2.6.29, a NLA_NESTED attribute, if it was present, was not allowed
+ * to be empty. However, OVS depends on the ability to accept empty
+ * attributes. For example, a present but empty ODP_FLOW_ATTR_ACTIONS on
+ * ODP_FLOW_CMD_SET replaces the existing set of actions by an empty "drop"
+ * action, whereas a missing ODP_FLOW_ATTR_ACTIONS leaves the existing
+ * actions, if any, unchanged.
+ *
+ * NLA_NESTED is different from NLA_UNSPEC in only two ways:
+ *
+ * - If the size of the nested attributes is zero, no further size checks
+ * are performed.
+ *
+ * - If the size of the nested attributes is not zero and no length
+ * parameter is specified the minimum size of nested attributes is
+ * NLA_HDRLEN.
+ *
+ * nla_parse_nested() validates that there is at least enough space for
+ * NLA_HDRLEN, so neither of these conditions are important, and we might
+ * as well use NLA_UNSPEC with old kernels.
+ */
+#undef NLA_NESTED
+#define NLA_NESTED NLA_UNSPEC
+#endif
#ifndef NLA_PUT_BE16
#define NLA_PUT_BE16(skb, attrtype, value) \
NLA_PUT_TYPE(skb, __be16, attrtype, value)
#endif /* !NLA_PUT_BE16 */
+#ifndef NLA_PUT_BE32
+#define NLA_PUT_BE32(skb, attrtype, value) \
+ NLA_PUT_TYPE(skb, __be32, attrtype, value)
+#endif /* !NLA_PUT_BE32 */
+
+#ifndef NLA_PUT_BE64
+#define NLA_PUT_BE64(skb, attrtype, value) \
+ NLA_PUT_TYPE(skb, __be64, attrtype, value)
+#endif /* !NLA_PUT_BE64 */
#ifndef HAVE_NLA_GET_BE16
/**
* nla_get_be16 - return payload of __be16 attribute
* @nla: __be16 netlink attribute
*/
-static inline __be16 nla_get_be16(struct nlattr *nla)
+static inline __be16 nla_get_be16(const struct nlattr *nla)
{
return *(__be16 *) nla_data(nla);
}
#endif /* !HAVE_NLA_GET_BE16 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+/**
+ * nla_get_be32 - return payload of __be32 attribute
+ * @nla: __be32 netlink attribute
+ */
+static inline __be32 nla_get_be32(const struct nlattr *nla)
+{
+ return *(__be32 *) nla_data(nla);
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
+/* These functions' nlattr source arguments weren't "const" before 2.6.29, so
+ * cast their arguments to the non-"const" versions. Using macros for this
+ * isn't exactly a brilliant idea, but it seems less error-prone than copying
+ * the definitions of all umpteen functions. */
+#define nla_get_u64(nla) (nla_get_u64) ((struct nlattr *) (nla))
+#define nla_get_u32(nla) (nla_get_u32) ((struct nlattr *) (nla))
+#define nla_get_u16(nla) (nla_get_u16) ((struct nlattr *) (nla))
+#define nla_get_u8(nla) (nla_get_u8) ((struct nlattr *) (nla))
+/* nla_get_be64 is handled separately below. */
+#define nla_get_be32(nla) (nla_get_be32) ((struct nlattr *) (nla))
+#define nla_get_be16(nla) (nla_get_be16) ((struct nlattr *) (nla))
+#define nla_get_be8(nla) (nla_get_be8) ((struct nlattr *) (nla))
+#define nla_get_flag(nla) (nla_get_flag) ((struct nlattr *) (nla))
+#define nla_get_msecs(nla) (nla_get_msecs)((struct nlattr *) (nla))
+#define nla_memcpy(dst, src, count) \
+ (nla_memcpy)(dst, (struct nlattr *)(src), count)
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
+/* This function was introduced in 2.6.31, but initially it performed an
+ * unaligned access, so we replace it up to 2.6.34 where it was fixed. */
+#define nla_get_be64 rpl_nla_get_be64
+static inline __be64 nla_get_be64(const struct nlattr *nla)
+{
+ __be64 tmp;
+
+ /* The additional cast is necessary because */
+ nla_memcpy(&tmp, (struct nlattr *) nla, sizeof(tmp));
+
+ return tmp;
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
+/**
+ * nla_type - attribute type
+ * @nla: netlink attribute
+ */
+static inline int nla_type(const struct nlattr *nla)
+{
+ return nla->nla_type & NLA_TYPE_MASK;
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
+#define nla_parse_nested(tb, maxtype, nla, policy) \
+ nla_parse_nested(tb, maxtype, (struct nlattr *)(nla), (struct nla_policy *)(policy))
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
+#define nla_parse_nested(tb, maxtype, nla, policy) \
+ nla_parse_nested(tb, maxtype, (struct nlattr *)(nla), policy)
+#endif
+
+#ifndef nla_for_each_nested
+#define nla_for_each_nested(pos, nla, rem) \
+ nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
+#endif
+
+#ifndef HAVE_NLA_FIND_NESTED
+static inline struct nlattr *nla_find_nested(struct nlattr *nla, int attrtype)
+{
+ return nla_find(nla_data(nla), nla_len(nla), attrtype);
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+/**
+ * nlmsg_report - need to report back to application?
+ * @nlh: netlink message header
+ *
+ * Returns 1 if a report back to the application is requested.
+ */
+static inline int nlmsg_report(const struct nlmsghdr *nlh)
+{
+ return !!(nlh->nlmsg_flags & NLM_F_ECHO);
+}
+
+extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb,
+ u32 pid, unsigned int group, int report,
+ gfp_t flags);
+#endif /* linux kernel < 2.6.19 */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+/* Before 2.6.19 the 'flags' parameter was missing, so replace it. We have to
+ * #include <net/genetlink.h> first because the 2.6.18 version of that header
+ * has an inline call to nlmsg_multicast() without, of course, any 'flags'
+ * argument. */
+#define nlmsg_multicast rpl_nlmsg_multicast
+static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
+ u32 pid, unsigned int group, gfp_t flags)
+{
+ int err;
+
+ NETLINK_CB(skb).dst_group = group;
+
+ err = netlink_broadcast(sk, skb, pid, group, flags);
+ if (err > 0)
+ err = 0;
+
+ return err;
+}
+#endif /* linux kernel < 2.6.19 */
+
#endif /* net/netlink.h */
git://git.onelab.eu / sliver-openvswitch.git / blobdiff