// SPDX-License-Identifier: GPL-2.0-only
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/types.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <linux/in6.h>
#include <net/ip.h>

int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
                                struct netlink_ext_ack *extack)
{
        *ip_proto = nla_get_u8(attr);

        switch (*ip_proto) {
        case IPPROTO_TCP:
        case IPPROTO_UDP:
                return 0;
        case IPPROTO_ICMP:
                if (family != AF_INET)
                        break;
                return 0;
#if IS_ENABLED(CONFIG_IPV6)
        case IPPROTO_ICMPV6:
                if (family != AF_INET6)
                        break;
                return 0;
#endif
        }
        NL_SET_ERR_MSG(extack, "Unsupported ip proto");
        return -EOPNOTSUPP;
}
EXPORT_SYMBOL_GPL(rtm_getroute_parse_ip_proto);