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-rw-r--r--net/netfilter/Kconfig6
-rw-r--r--net/netfilter/Makefile1
-rw-r--r--net/netfilter/nft_tunnel.c458
3 files changed, 465 insertions, 0 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 55e399d5af10..654588088676 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -559,6 +559,12 @@ config NFT_NAT
This option adds the "nat" expression that you can use to perform
typical Network Address Translation (NAT) packet transformations.
+config NFT_TUNNEL
+ tristate "Netfilter nf_tables tunnel module"
+ help
+ This option adds the "tunnel" expression that you can use to set
+ tunneling policies.
+
config NFT_OBJREF
tristate "Netfilter nf_tables stateful object reference module"
help
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index cf61615cc529..16895e045b66 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -101,6 +101,7 @@ obj-$(CONFIG_NFT_QUEUE) += nft_queue.o
obj-$(CONFIG_NFT_QUOTA) += nft_quota.o
obj-$(CONFIG_NFT_REJECT) += nft_reject.o
obj-$(CONFIG_NFT_REJECT_INET) += nft_reject_inet.o
+obj-$(CONFIG_NFT_TUNNEL) += nft_tunnel.o
obj-$(CONFIG_NFT_COUNTER) += nft_counter.o
obj-$(CONFIG_NFT_LOG) += nft_log.o
obj-$(CONFIG_NFT_MASQ) += nft_masq.o
diff --git a/net/netfilter/nft_tunnel.c b/net/netfilter/nft_tunnel.c
new file mode 100644
index 000000000000..715613d99c20
--- /dev/null
+++ b/net/netfilter/nft_tunnel.c
@@ -0,0 +1,458 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seqlock.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/dst_metadata.h>
+#include <net/ip_tunnels.h>
+#include <net/vxlan.h>
+#include <net/erspan.h>
+
+struct nft_tunnel_opts {
+ union {
+ struct vxlan_metadata vxlan;
+ struct erspan_metadata erspan;
+ } u;
+ u32 len;
+ u32 flags;
+};
+
+struct nft_tunnel_obj {
+ struct metadata_dst *md;
+ struct nft_tunnel_opts opts;
+};
+
+static const struct nla_policy nft_tunnel_ip_policy[NFTA_TUNNEL_KEY_IP_MAX + 1] = {
+ [NFTA_TUNNEL_KEY_IP_SRC] = { .type = NLA_U32 },
+ [NFTA_TUNNEL_KEY_IP_DST] = { .type = NLA_U32 },
+};
+
+static int nft_tunnel_obj_ip_init(const struct nft_ctx *ctx,
+ const struct nlattr *attr,
+ struct ip_tunnel_info *info)
+{
+ struct nlattr *tb[NFTA_TUNNEL_KEY_IP_MAX + 1];
+ int err;
+
+ err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP_MAX, attr,
+ nft_tunnel_ip_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFTA_TUNNEL_KEY_IP_DST])
+ return -EINVAL;
+
+ if (tb[NFTA_TUNNEL_KEY_IP_SRC])
+ info->key.u.ipv4.src = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_SRC]);
+ if (tb[NFTA_TUNNEL_KEY_IP_DST])
+ info->key.u.ipv4.dst = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_DST]);
+
+ return 0;
+}
+
+static const struct nla_policy nft_tunnel_ip6_policy[NFTA_TUNNEL_KEY_IP6_MAX + 1] = {
+ [NFTA_TUNNEL_KEY_IP6_SRC] = { .len = sizeof(struct in6_addr), },
+ [NFTA_TUNNEL_KEY_IP6_DST] = { .len = sizeof(struct in6_addr), },
+ [NFTA_TUNNEL_KEY_IP6_FLOWLABEL] = { .type = NLA_U32, }
+};
+
+static int nft_tunnel_obj_ip6_init(const struct nft_ctx *ctx,
+ const struct nlattr *attr,
+ struct ip_tunnel_info *info)
+{
+ struct nlattr *tb[NFTA_TUNNEL_KEY_IP6_MAX + 1];
+ int err;
+
+ err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_IP6_MAX, attr,
+ nft_tunnel_ip6_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFTA_TUNNEL_KEY_IP6_DST])
+ return -EINVAL;
+
+ if (tb[NFTA_TUNNEL_KEY_IP6_SRC]) {
+ memcpy(&info->key.u.ipv6.src,
+ nla_data(tb[NFTA_TUNNEL_KEY_IP6_SRC]),
+ sizeof(struct in6_addr));
+ }
+ if (tb[NFTA_TUNNEL_KEY_IP6_DST]) {
+ memcpy(&info->key.u.ipv6.dst,
+ nla_data(tb[NFTA_TUNNEL_KEY_IP6_DST]),
+ sizeof(struct in6_addr));
+ }
+ if (tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL])
+ info->key.label = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]);
+
+ info->mode |= IP_TUNNEL_INFO_IPV6;
+
+ return 0;
+}
+
+static const struct nla_policy nft_tunnel_opts_vxlan_policy[NFTA_TUNNEL_KEY_VXLAN_MAX + 1] = {
+ [NFTA_TUNNEL_KEY_VXLAN_GBP] = { .type = NLA_U32 },
+};
+
+static int nft_tunnel_obj_vxlan_init(const struct nlattr *attr,
+ struct nft_tunnel_opts *opts)
+{
+ struct nlattr *tb[NFTA_TUNNEL_KEY_VXLAN_MAX + 1];
+ int err;
+
+ err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_VXLAN_MAX, attr,
+ nft_tunnel_opts_vxlan_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFTA_TUNNEL_KEY_VXLAN_GBP])
+ return -EINVAL;
+
+ opts->u.vxlan.gbp = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_VXLAN_GBP]));
+
+ opts->len = sizeof(struct vxlan_metadata);
+ opts->flags = TUNNEL_VXLAN_OPT;
+
+ return 0;
+}
+
+static const struct nla_policy nft_tunnel_opts_erspan_policy[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1] = {
+ [NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX] = { .type = NLA_U32 },
+ [NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] = { .type = NLA_U8 },
+ [NFTA_TUNNEL_KEY_ERSPAN_V2_HWID] = { .type = NLA_U8 },
+};
+
+static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
+ struct nft_tunnel_opts *opts)
+{
+ struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
+ uint8_t hwid, dir;
+ int err, version;
+
+ err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX, attr,
+ nft_tunnel_opts_erspan_policy, NULL);
+ if (err < 0)
+ return err;
+
+ version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
+ switch (version) {
+ case ERSPAN_VERSION:
+ if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
+ return -EINVAL;
+
+ opts->u.erspan.u.index =
+ nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
+ break;
+ case ERSPAN_VERSION2:
+ if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
+ !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
+ return -EINVAL;
+
+ hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
+ dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
+
+ set_hwid(&opts->u.erspan.u.md2, hwid);
+ opts->u.erspan.u.md2.dir = dir;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ opts->u.erspan.version = version;
+
+ opts->len = sizeof(struct erspan_metadata);
+ opts->flags = TUNNEL_ERSPAN_OPT;
+
+ return 0;
+}
+
+static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
+ [NFTA_TUNNEL_KEY_OPTS_VXLAN] = { .type = NLA_NESTED, },
+ [NFTA_TUNNEL_KEY_OPTS_ERSPAN] = { .type = NLA_NESTED, },
+};
+
+static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
+ const struct nlattr *attr,
+ struct ip_tunnel_info *info,
+ struct nft_tunnel_opts *opts)
+{
+ struct nlattr *tb[NFTA_TUNNEL_KEY_OPTS_MAX + 1];
+ int err;
+
+ err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_OPTS_MAX, attr,
+ nft_tunnel_opts_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (tb[NFTA_TUNNEL_KEY_OPTS_VXLAN]) {
+ err = nft_tunnel_obj_vxlan_init(tb[NFTA_TUNNEL_KEY_OPTS_VXLAN],
+ opts);
+ } else if (tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN]) {
+ err = nft_tunnel_obj_erspan_init(tb[NFTA_TUNNEL_KEY_OPTS_ERSPAN],
+ opts);
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ return err;
+}
+
+static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
+ [NFTA_TUNNEL_KEY_IP] = { .type = NLA_NESTED, },
+ [NFTA_TUNNEL_KEY_IP6] = { .type = NLA_NESTED, },
+ [NFTA_TUNNEL_KEY_ID] = { .type = NLA_U32, },
+ [NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, },
+ [NFTA_TUNNEL_KEY_TOS] = { .type = NLA_U8, },
+ [NFTA_TUNNEL_KEY_TTL] = { .type = NLA_U8, },
+ [NFTA_TUNNEL_KEY_OPTS] = { .type = NLA_NESTED, },
+};
+
+static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
+ const struct nlattr * const tb[],
+ struct nft_object *obj)
+{
+ struct nft_tunnel_obj *priv = nft_obj_data(obj);
+ struct ip_tunnel_info info;
+ struct metadata_dst *md;
+ int err;
+
+ if (!tb[NFTA_TUNNEL_KEY_ID])
+ return -EINVAL;
+
+ memset(&info, 0, sizeof(info));
+ info.mode = IP_TUNNEL_INFO_TX;
+ info.key.tun_id = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
+ info.key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
+
+ if (tb[NFTA_TUNNEL_KEY_IP]) {
+ err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
+ if (err < 0)
+ return err;
+ } else if (tb[NFTA_TUNNEL_KEY_IP6]) {
+ err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
+ if (err < 0)
+ return err;
+ } else {
+ return -EINVAL;
+ }
+
+ if (tb[NFTA_TUNNEL_KEY_SPORT]) {
+ info.key.tp_src =
+ ntohs(nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]));
+ }
+ if (tb[NFTA_TUNNEL_KEY_DPORT]) {
+ info.key.tp_dst =
+ ntohs(nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]));
+ }
+
+ if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
+ u32 tun_flags;
+
+ tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
+ 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;
+ }
+ if (tb[NFTA_TUNNEL_KEY_TOS])
+ info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
+ if (tb[NFTA_TUNNEL_KEY_TTL])
+ info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
+ else
+ 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;
+ }
+
+ 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;
+}
+
+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, htons(info->key.tp_src)) < 0 ||
+ nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, htons(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)
+{
+ return nft_register_obj(&nft_tunnel_obj_type);
+}
+
+static void __exit nft_tunnel_module_exit(void)
+{
+ nft_unregister_obj(&nft_tunnel_obj_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_OBJ(NFT_OBJECT_TUNNEL);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-30 17:32:10 +0000