dt-binding: net: sfp binding documentation

[linux-2.6-block.git] / lib / nlattr.c

diff --git a/lib/nlattr.c b/lib/nlattr.c
index fb52435be42dda3a5e7041b3554712bc80b4caad..927c2f19f119e4eb4f21b02987db34e3edc97fa8 100644 (file)
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -27,6 +27,30 @@ static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = {
        [NLA_S64]       = sizeof(s64),
 };
 
+static int validate_nla_bitfield32(const struct nlattr *nla,
+                                  u32 *valid_flags_allowed)
+{
+       const struct nla_bitfield32 *bf = nla_data(nla);
+       u32 *valid_flags_mask = valid_flags_allowed;
+
+       if (!valid_flags_allowed)
+               return -EINVAL;
+
+       /*disallow invalid bit selector */
+       if (bf->selector & ~*valid_flags_mask)
+               return -EINVAL;
+
+       /*disallow invalid bit values */
+       if (bf->value & ~*valid_flags_mask)
+               return -EINVAL;
+
+       /*disallow valid bit values that are not selected*/
+       if (bf->value & ~bf->selector)
+               return -EINVAL;
+
+       return 0;
+}
+
 static int validate_nla(const struct nlattr *nla, int maxtype,
                        const struct nla_policy *policy)
 {
@@ -46,6 +70,12 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
                        return -ERANGE;
                break;
 
+       case NLA_BITFIELD32:
+               if (attrlen != sizeof(struct nla_bitfield32))
+                       return -ERANGE;
+
+               return validate_nla_bitfield32(nla, pt->validation_data);
+
        case NLA_NUL_STRING:
                if (pt->len)
                        minlen = min_t(int, attrlen, pt->len + 1);
@@ -271,6 +301,30 @@ size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
 }
 EXPORT_SYMBOL(nla_strlcpy);
 
+/**
+ * nla_strdup - Copy string attribute payload into a newly allocated buffer
+ * @nla: attribute to copy the string from
+ * @flags: the type of memory to allocate (see kmalloc).
+ *
+ * Returns a pointer to the allocated buffer or NULL on error.
+ */
+char *nla_strdup(const struct nlattr *nla, gfp_t flags)
+{
+       size_t srclen = nla_len(nla);
+       char *src = nla_data(nla), *dst;
+
+       if (srclen > 0 && src[srclen - 1] == '\0')
+               srclen--;
+
+       dst = kmalloc(srclen + 1, flags);
+       if (dst != NULL) {
+               memcpy(dst, src, srclen);
+               dst[srclen] = '\0';
+       }
+       return dst;
+}
+EXPORT_SYMBOL(nla_strdup);
+
 /**
  * nla_memcpy - Copy a netlink attribute into another memory area
  * @dest: where to copy to memcpy