/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/seqlock.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/dst_metadata.h>
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#include <net/ip_tunnels.h>
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#include <net/vxlan.h>
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#include <net/erspan.h>
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struct nft_tunnel {
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enum nft_tunnel_keys key:8;
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enum nft_registers dreg:8;
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};
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static void nft_tunnel_get_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_tunnel *priv = nft_expr_priv(expr);
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u32 *dest = ®s->data[priv->dreg];
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struct ip_tunnel_info *tun_info;
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tun_info = skb_tunnel_info(pkt->skb);
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switch (priv->key) {
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case NFT_TUNNEL_PATH:
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nft_reg_store8(dest, !!tun_info);
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break;
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case NFT_TUNNEL_ID:
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if (!tun_info) {
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regs->verdict.code = NFT_BREAK;
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return;
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}
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*dest = ntohl(tunnel_id_to_key32(tun_info->key.tun_id));
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break;
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default:
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WARN_ON(1);
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regs->verdict.code = NFT_BREAK;
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}
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}
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static const struct nla_policy nft_tunnel_policy[NFTA_TUNNEL_MAX + 1] = {
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[NFTA_TUNNEL_KEY] = { .type = NLA_U32 },
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[NFTA_TUNNEL_DREG] = { .type = NLA_U32 },
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};
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static int nft_tunnel_get_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_tunnel *priv = nft_expr_priv(expr);
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u32 len;
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if (!tb[NFTA_TUNNEL_KEY] ||
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!tb[NFTA_TUNNEL_DREG])
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return -EINVAL;
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priv->key = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY]));
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switch (priv->key) {
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case NFT_TUNNEL_PATH:
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len = sizeof(u8);
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break;
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case NFT_TUNNEL_ID:
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len = sizeof(u32);
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break;
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default:
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return -EOPNOTSUPP;
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}
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priv->dreg = nft_parse_register(tb[NFTA_TUNNEL_DREG]);
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return nft_validate_register_store(ctx, priv->dreg, NULL,
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NFT_DATA_VALUE, len);
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}
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static int nft_tunnel_get_dump(struct sk_buff *skb,
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const struct nft_expr *expr)
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{
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const struct nft_tunnel *priv = nft_expr_priv(expr);
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if (nla_put_be32(skb, NFTA_TUNNEL_KEY, htonl(priv->key)))
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goto nla_put_failure;
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if (nft_dump_register(skb, NFTA_TUNNEL_DREG, priv->dreg))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_tunnel_type;
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static const struct nft_expr_ops nft_tunnel_get_ops = {
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.type = &nft_tunnel_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_tunnel)),
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.eval = nft_tunnel_get_eval,
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.init = nft_tunnel_get_init,
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.dump = nft_tunnel_get_dump,
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};
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static struct nft_expr_type nft_tunnel_type __read_mostly = {
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.name = "tunnel",
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.ops = &nft_tunnel_get_ops,
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.policy = nft_tunnel_policy,
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.maxattr = NFTA_TUNNEL_MAX,
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.owner = THIS_MODULE,
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};
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struct nft_tunnel_opts {
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union {
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struct vxlan_metadata vxlan;
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struct erspan_metadata erspan;
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} u;
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u32 len;
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__be16 flags;
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};
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struct nft_tunnel_obj {
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struct metadata_dst *md;
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struct nft_tunnel_opts opts;
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};
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static const struct nla_policy nft_tunnel_ip_policy[NFTA_TUNNEL_KEY_IP_MAX + 1] = {
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[NFTA_TUNNEL_KEY_IP_SRC] = { .type = NLA_U32 },
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[NFTA_TUNNEL_KEY_IP_DST] = { .type = NLA_U32 },
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};
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static int nft_tunnel_obj_ip_init(const struct nft_ctx *ctx,
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const struct nlattr *attr,
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struct ip_tunnel_info *info)
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{
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struct nlattr *tb[NFTA_TUNNEL_KEY_IP_MAX + 1];
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int err;
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err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP_MAX, attr,
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nft_tunnel_ip_policy, NULL);
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if (err < 0)
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return err;
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if (!tb[NFTA_TUNNEL_KEY_IP_DST])
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return -EINVAL;
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if (tb[NFTA_TUNNEL_KEY_IP_SRC])
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info->key.u.ipv4.src = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_SRC]);
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if (tb[NFTA_TUNNEL_KEY_IP_DST])
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info->key.u.ipv4.dst = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_DST]);
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return 0;
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}
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static const struct nla_policy nft_tunnel_ip6_policy[NFTA_TUNNEL_KEY_IP6_MAX + 1] = {
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[NFTA_TUNNEL_KEY_IP6_SRC] = { .len = sizeof(struct in6_addr), },
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[NFTA_TUNNEL_KEY_IP6_DST] = { .len = sizeof(struct in6_addr), },
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[NFTA_TUNNEL_KEY_IP6_FLOWLABEL] = { .type = NLA_U32, }
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};
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static int nft_tunnel_obj_ip6_init(const struct nft_ctx *ctx,
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const struct nlattr *attr,
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struct ip_tunnel_info *info)
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{
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struct nlattr *tb[NFTA_TUNNEL_KEY_IP6_MAX + 1];
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int err;
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err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP6_MAX, attr,
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nft_tunnel_ip6_policy, NULL);
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if (err < 0)
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return err;
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if (!tb[NFTA_TUNNEL_KEY_IP6_DST])
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return -EINVAL;
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if (tb[NFTA_TUNNEL_KEY_IP6_SRC]) {
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memcpy(&info->key.u.ipv6.src,
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nla_data(tb[NFTA_TUNNEL_KEY_IP6_SRC]),
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sizeof(struct in6_addr));
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}
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if (tb[NFTA_TUNNEL_KEY_IP6_DST]) {
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memcpy(&info->key.u.ipv6.dst,
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nla_data(tb[NFTA_TUNNEL_KEY_IP6_DST]),
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sizeof(struct in6_addr));
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}
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if (tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL])
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info->key.label = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]);
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info->mode |= IP_TUNNEL_INFO_IPV6;
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return 0;
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}
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static const struct nla_policy nft_tunnel_opts_vxlan_policy[NFTA_TUNNEL_KEY_VXLAN_MAX + 1] = {
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[NFTA_TUNNEL_KEY_VXLAN_GBP] = { .type = NLA_U32 },
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};
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static int nft_tunnel_obj_vxlan_init(const struct nlattr *attr,
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struct nft_tunnel_opts *opts)
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{
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struct nlattr *tb[NFTA_TUNNEL_KEY_VXLAN_MAX + 1];
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int err;
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err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_VXLAN_MAX, attr,
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nft_tunnel_opts_vxlan_policy, NULL);
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if (err < 0)
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return err;
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if (!tb[NFTA_TUNNEL_KEY_VXLAN_GBP])
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return -EINVAL;
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opts->u.vxlan.gbp = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_VXLAN_GBP]));
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opts->len = sizeof(struct vxlan_metadata);
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opts->flags = TUNNEL_VXLAN_OPT;
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return 0;
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}
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static const struct nla_policy nft_tunnel_opts_erspan_policy[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1] = {
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[NFTA_TUNNEL_KEY_ERSPAN_VERSION] = { .type = NLA_U32 },
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[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX] = { .type = NLA_U32 },
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[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] = { .type = NLA_U8 },
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[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID] = { .type = NLA_U8 },
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};
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static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
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struct nft_tunnel_opts *opts)
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{
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struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
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uint8_t hwid, dir;
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int err, version;
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err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX, attr,
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nft_tunnel_opts_erspan_policy, NULL);
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if (err < 0)
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return err;
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if (!tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION])
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return -EINVAL;
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version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
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switch (version) {
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case ERSPAN_VERSION:
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if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
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return -EINVAL;
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opts->u.erspan.u.index =
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nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
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break;
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case ERSPAN_VERSION2:
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if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
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!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
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return -EINVAL;
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hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
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dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
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set_hwid(&opts->u.erspan.u.md2, hwid);
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opts->u.erspan.u.md2.dir = dir;
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break;
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default:
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return -EOPNOTSUPP;
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}
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opts->u.erspan.version = version;
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opts->len = sizeof(struct erspan_metadata);
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opts->flags = TUNNEL_ERSPAN_OPT;
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return 0;
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}
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static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
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[NFTA_TUNNEL_KEY_OPTS_VXLAN] = { .type = NLA_NESTED, },
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[NFTA_TUNNEL_KEY_OPTS_ERSPAN] = { .type = NLA_NESTED, },
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};
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static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
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const struct nlattr *attr,
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struct ip_tunnel_info *info,
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struct nft_tunnel_opts *opts)
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{
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struct nlattr *tb[NFTA_TUNNEL_KEY_OPTS_MAX + 1];
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int err;
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err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_OPTS_MAX, attr,
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nft_tunnel_opts_policy, NULL);
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if (err < 0)
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return err;
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if (tb[NFTA_TUNNEL_KEY_OPTS_VXLAN]) {
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err = nft_tunnel_obj_vxlan_init(tb[NFTA_TUNNEL_KEY_OPTS_VXLAN],
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opts);
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} else if (tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN]) {
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err = nft_tunnel_obj_erspan_init(tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN],
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opts);
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} else {
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return -EOPNOTSUPP;
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}
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return err;
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}
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static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
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[NFTA_TUNNEL_KEY_IP] = { .type = NLA_NESTED, },
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[NFTA_TUNNEL_KEY_IP6] = { .type = NLA_NESTED, },
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[NFTA_TUNNEL_KEY_ID] = { .type = NLA_U32, },
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[NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, },
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[NFTA_TUNNEL_KEY_TOS] = { .type = NLA_U8, },
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[NFTA_TUNNEL_KEY_TTL] = { .type = NLA_U8, },
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[NFTA_TUNNEL_KEY_SPORT] = { .type = NLA_U16, },
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[NFTA_TUNNEL_KEY_DPORT] = { .type = NLA_U16, },
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[NFTA_TUNNEL_KEY_OPTS] = { .type = NLA_NESTED, },
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};
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static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
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const struct nlattr * const tb[],
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struct nft_object *obj)
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{
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struct nft_tunnel_obj *priv = nft_obj_data(obj);
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struct ip_tunnel_info info;
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struct metadata_dst *md;
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int err;
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if (!tb[NFTA_TUNNEL_KEY_ID])
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return -EINVAL;
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memset(&info, 0, sizeof(info));
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info.mode = IP_TUNNEL_INFO_TX;
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info.key.tun_id = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
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info.key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
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if (tb[NFTA_TUNNEL_KEY_IP]) {
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err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
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if (err < 0)
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return err;
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} else if (tb[NFTA_TUNNEL_KEY_IP6]) {
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err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
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if (err < 0)
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return err;
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} else {
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return -EINVAL;
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}
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if (tb[NFTA_TUNNEL_KEY_SPORT]) {
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info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]);
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}
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if (tb[NFTA_TUNNEL_KEY_DPORT]) {
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info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]);
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}
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if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
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u32 tun_flags;
|
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tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
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if (tun_flags & ~NFT_TUNNEL_F_MASK)
|
return -EOPNOTSUPP;
|
|
if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX)
|
info.key.tun_flags &= ~TUNNEL_CSUM;
|
if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT)
|
info.key.tun_flags |= TUNNEL_DONT_FRAGMENT;
|
if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER)
|
info.key.tun_flags |= TUNNEL_SEQ;
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}
|
if (tb[NFTA_TUNNEL_KEY_TOS])
|
info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
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if (tb[NFTA_TUNNEL_KEY_TTL])
|
info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
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else
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info.key.ttl = U8_MAX;
|
|
if (tb[NFTA_TUNNEL_KEY_OPTS]) {
|
err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS],
|
&info, &priv->opts);
|
if (err < 0)
|
return err;
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}
|
|
md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL);
|
if (!md)
|
return -ENOMEM;
|
|
memcpy(&md->u.tun_info, &info, sizeof(info));
|
ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len,
|
priv->opts.flags);
|
priv->md = md;
|
|
return 0;
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}
|
|
static inline void nft_tunnel_obj_eval(struct nft_object *obj,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
struct nft_tunnel_obj *priv = nft_obj_data(obj);
|
struct sk_buff *skb = pkt->skb;
|
|
skb_dst_drop(skb);
|
dst_hold((struct dst_entry *) priv->md);
|
skb_dst_set(skb, (struct dst_entry *) priv->md);
|
}
|
|
static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info)
|
{
|
struct nlattr *nest;
|
|
if (info->mode & IP_TUNNEL_INFO_IPV6) {
|
nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP6);
|
if (!nest)
|
return -1;
|
|
if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC, &info->key.u.ipv6.src) < 0 ||
|
nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST, &info->key.u.ipv6.dst) < 0 ||
|
nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL, info->key.label))
|
return -1;
|
|
nla_nest_end(skb, nest);
|
} else {
|
nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_IP);
|
if (!nest)
|
return -1;
|
|
if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC, info->key.u.ipv4.src) < 0 ||
|
nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST, info->key.u.ipv4.dst) < 0)
|
return -1;
|
|
nla_nest_end(skb, nest);
|
}
|
|
return 0;
|
}
|
|
static int nft_tunnel_opts_dump(struct sk_buff *skb,
|
struct nft_tunnel_obj *priv)
|
{
|
struct nft_tunnel_opts *opts = &priv->opts;
|
struct nlattr *nest;
|
|
nest = nla_nest_start(skb, NFTA_TUNNEL_KEY_OPTS);
|
if (!nest)
|
return -1;
|
|
if (opts->flags & TUNNEL_VXLAN_OPT) {
|
if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP,
|
htonl(opts->u.vxlan.gbp)))
|
return -1;
|
} else if (opts->flags & TUNNEL_ERSPAN_OPT) {
|
switch (opts->u.erspan.version) {
|
case ERSPAN_VERSION:
|
if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
|
opts->u.erspan.u.index))
|
return -1;
|
break;
|
case ERSPAN_VERSION2:
|
if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
|
get_hwid(&opts->u.erspan.u.md2)) ||
|
nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
|
opts->u.erspan.u.md2.dir))
|
return -1;
|
break;
|
}
|
}
|
nla_nest_end(skb, nest);
|
|
return 0;
|
}
|
|
static int nft_tunnel_ports_dump(struct sk_buff *skb,
|
struct ip_tunnel_info *info)
|
{
|
if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, info->key.tp_src) < 0 ||
|
nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, info->key.tp_dst) < 0)
|
return -1;
|
|
return 0;
|
}
|
|
static int nft_tunnel_flags_dump(struct sk_buff *skb,
|
struct ip_tunnel_info *info)
|
{
|
u32 flags = 0;
|
|
if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
|
flags |= NFT_TUNNEL_F_DONT_FRAGMENT;
|
if (!(info->key.tun_flags & TUNNEL_CSUM))
|
flags |= NFT_TUNNEL_F_ZERO_CSUM_TX;
|
if (info->key.tun_flags & TUNNEL_SEQ)
|
flags |= NFT_TUNNEL_F_SEQ_NUMBER;
|
|
if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0)
|
return -1;
|
|
return 0;
|
}
|
|
static int nft_tunnel_obj_dump(struct sk_buff *skb,
|
struct nft_object *obj, bool reset)
|
{
|
struct nft_tunnel_obj *priv = nft_obj_data(obj);
|
struct ip_tunnel_info *info = &priv->md->u.tun_info;
|
|
if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
|
tunnel_id_to_key32(info->key.tun_id)) ||
|
nft_tunnel_ip_dump(skb, info) < 0 ||
|
nft_tunnel_ports_dump(skb, info) < 0 ||
|
nft_tunnel_flags_dump(skb, info) < 0 ||
|
nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) ||
|
nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) ||
|
nft_tunnel_opts_dump(skb, priv) < 0)
|
goto nla_put_failure;
|
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx,
|
struct nft_object *obj)
|
{
|
struct nft_tunnel_obj *priv = nft_obj_data(obj);
|
|
metadata_dst_free(priv->md);
|
}
|
|
static struct nft_object_type nft_tunnel_obj_type;
|
static const struct nft_object_ops nft_tunnel_obj_ops = {
|
.type = &nft_tunnel_obj_type,
|
.size = sizeof(struct nft_tunnel_obj),
|
.eval = nft_tunnel_obj_eval,
|
.init = nft_tunnel_obj_init,
|
.destroy = nft_tunnel_obj_destroy,
|
.dump = nft_tunnel_obj_dump,
|
};
|
|
static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
|
.type = NFT_OBJECT_TUNNEL,
|
.ops = &nft_tunnel_obj_ops,
|
.maxattr = NFTA_TUNNEL_KEY_MAX,
|
.policy = nft_tunnel_key_policy,
|
.owner = THIS_MODULE,
|
};
|
|
static int __init nft_tunnel_module_init(void)
|
{
|
int err;
|
|
err = nft_register_expr(&nft_tunnel_type);
|
if (err < 0)
|
return err;
|
|
err = nft_register_obj(&nft_tunnel_obj_type);
|
if (err < 0)
|
nft_unregister_expr(&nft_tunnel_type);
|
|
return err;
|
}
|
|
static void __exit nft_tunnel_module_exit(void)
|
{
|
nft_unregister_obj(&nft_tunnel_obj_type);
|
nft_unregister_expr(&nft_tunnel_type);
|
}
|
|
module_init(nft_tunnel_module_init);
|
module_exit(nft_tunnel_module_exit);
|
|
MODULE_LICENSE("GPL");
|
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
|
MODULE_ALIAS_NFT_EXPR("tunnel");
|
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);
|
