/**
* Validate Generic Netlink message including attributes
* @arg nlh Pointer to Netlink message header
* @arg hdrlen Length of user header
* @arg maxtype Maximum attribtue id expected
* @arg policy Attribute validation policy
*
* Verifies the validity of the Netlink and Generic Netlink headers using
* genlmsg_valid_hdr() and calls nla_validate() on the message payload to
* verify the integrity of eventual attributes.
*
* @note You may call genlmsg_parse() directly to perform validation and
* parsing in a single step.
*
* @see genlmsg_valid_hdr()
* @see nla_validate()
* @see genlmsg_parse()
*
* @return 0 on success or a negative error code.
*/
int genlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype,
struct nla_policy *policy)
{
struct genlmsghdr *ghdr;
if (!genlmsg_valid_hdr(nlh, hdrlen))
return -NLE_MSG_TOOSHORT;
ghdr = nlmsg_data(nlh);
return nla_validate(genlmsg_attrdata(ghdr, hdrlen),
genlmsg_attrlen(ghdr, hdrlen), maxtype, policy);
}
int genlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype,
struct nla_policy *policy)
{
struct genlmsghdr *ghdr;
if (!genlmsg_valid_hdr(nlh, hdrlen))
return nl_errno(EINVAL);
ghdr = nlmsg_data(nlh);
return nla_validate(genlmsg_attrdata(ghdr, hdrlen),
genlmsg_attrlen(ghdr, hdrlen), maxtype, policy);
}
static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
int dst_len, struct netlink_ext_ack *extack)
{
int err, rem, opt_len, len = nla_len(nla), opts_len = 0;
const struct nlattr *attr, *head = nla_data(nla);
err = nla_validate(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
enc_opts_policy, extack);
if (err)
return err;
nla_for_each_attr(attr, head, len, rem) {
switch (nla_type(attr)) {
case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
opt_len = tunnel_key_copy_geneve_opt(attr, dst,
dst_len, extack);
if (opt_len < 0)
return opt_len;
opts_len += opt_len;
if (dst) {
dst_len -= opt_len;
dst += opt_len;
}
break;
}
}
if (!opts_len) {
NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
return -EINVAL;
}
if (rem > 0) {
NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
return -EINVAL;
}
return opts_len;
}
