1 files changed, 351 insertions, 0 deletions
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
new file mode 100644
index 000000000000..dceff7412dc3
--- /dev/null
+++ b/net/sched/act_tunnel_key.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
+ * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/dst.h>
+#include <net/dst_metadata.h>
+
+#include <linux/tc_act/tc_tunnel_key.h>
+#include <net/tc_act/tc_tunnel_key.h>
+
+#define TUNNEL_KEY_TAB_MASK     15
+
+static int tunnel_key_net_id;
+static struct tc_action_ops act_tunnel_key_ops;
+
+static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
+			  struct tcf_result *res)
+{
+	struct tcf_tunnel_key *t = to_tunnel_key(a);
+	struct tcf_tunnel_key_params *params;
+	int action;
+
+	rcu_read_lock();
+
+	params = rcu_dereference(t->params);
+
+	tcf_lastuse_update(&t->tcf_tm);
+	bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
+	action = params->action;
+
+	switch (params->tcft_action) {
+	case TCA_TUNNEL_KEY_ACT_RELEASE:
+		skb_dst_drop(skb);
+		break;
+	case TCA_TUNNEL_KEY_ACT_SET:
+		skb_dst_drop(skb);
+		skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
+		break;
+	default:
+		WARN_ONCE(1, "Bad tunnel_key action %d.\n",
+			  params->tcft_action);
+		break;
+	}
+
+	rcu_read_unlock();
+
+	return action;
+}
+
+static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
+	[TCA_TUNNEL_KEY_PARMS]	    = { .len = sizeof(struct tc_tunnel_key) },
+	[TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
+	[TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
+	[TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
+	[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
+	[TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
+};
+
+static int tunnel_key_init(struct net *net, struct nlattr *nla,
+			   struct nlattr *est, struct tc_action **a,
+			   int ovr, int bind)
+{
+	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
+	struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
+	struct tcf_tunnel_key_params *params_old;
+	struct tcf_tunnel_key_params *params_new;
+	struct metadata_dst *metadata = NULL;
+	struct tc_tunnel_key *parm;
+	struct tcf_tunnel_key *t;
+	bool exists = false;
+	__be64 key_id;
+	int ret = 0;
+	int err;
+
+	if (!nla)
+		return -EINVAL;
+
+	err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy);
+	if (err < 0)
+		return err;
+
+	if (!tb[TCA_TUNNEL_KEY_PARMS])
+		return -EINVAL;
+
+	parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
+	exists = tcf_hash_check(tn, parm->index, a, bind);
+	if (exists && bind)
+		return 0;
+
+	switch (parm->t_action) {
+	case TCA_TUNNEL_KEY_ACT_RELEASE:
+		break;
+	case TCA_TUNNEL_KEY_ACT_SET:
+		if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
+			ret = -EINVAL;
+			goto err_out;
+		}
+
+		key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
+
+		if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
+		    tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
+			__be32 saddr;
+			__be32 daddr;
+
+			saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
+			daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
+
+			metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
+						    TUNNEL_KEY, key_id, 0);
+		} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
+			   tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
+			struct in6_addr saddr;
+			struct in6_addr daddr;
+
+			saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
+			daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
+
+			metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, 0,
+						      TUNNEL_KEY, key_id, 0);
+		}
+
+		if (!metadata) {
+			ret = -EINVAL;
+			goto err_out;
+		}
+
+		metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
+		break;
+	default:
+		goto err_out;
+	}
+
+	if (!exists) {
+		ret = tcf_hash_create(tn, parm->index, est, a,
+				      &act_tunnel_key_ops, bind, true);
+		if (ret)
+			return ret;
+
+		ret = ACT_P_CREATED;
+	} else {
+		tcf_hash_release(*a, bind);
+		if (!ovr)
+			return -EEXIST;
+	}
+
+	t = to_tunnel_key(*a);
+
+	ASSERT_RTNL();
+	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
+	if (unlikely(!params_new)) {
+		if (ret == ACT_P_CREATED)
+			tcf_hash_release(*a, bind);
+		return -ENOMEM;
+	}
+
+	params_old = rtnl_dereference(t->params);
+
+	params_new->action = parm->action;
+	params_new->tcft_action = parm->t_action;
+	params_new->tcft_enc_metadata = metadata;
+
+	rcu_assign_pointer(t->params, params_new);
+
+	if (params_old)
+		kfree_rcu(params_old, rcu);
+
+	if (ret == ACT_P_CREATED)
+		tcf_hash_insert(tn, *a);
+
+	return ret;
+
+err_out:
+	if (exists)
+		tcf_hash_release(*a, bind);
+	return ret;
+}
+
+static void tunnel_key_release(struct tc_action *a, int bind)
+{
+	struct tcf_tunnel_key *t = to_tunnel_key(a);
+	struct tcf_tunnel_key_params *params;
+
+	rcu_read_lock();
+	params = rcu_dereference(t->params);
+
+	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
+		dst_release(&params->tcft_enc_metadata->dst);
+
+	kfree_rcu(params, rcu);
+
+	rcu_read_unlock();
+}
+
+static int tunnel_key_dump_addresses(struct sk_buff *skb,
+				     const struct ip_tunnel_info *info)
+{
+	unsigned short family = ip_tunnel_info_af(info);
+
+	if (family == AF_INET) {
+		__be32 saddr = info->key.u.ipv4.src;
+		__be32 daddr = info->key.u.ipv4.dst;
+
+		if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
+		    !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
+			return 0;
+	}
+
+	if (family == AF_INET6) {
+		const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
+		const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
+
+		if (!nla_put_in6_addr(skb,
+				      TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
+		    !nla_put_in6_addr(skb,
+				      TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
+			return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
+			   int bind, int ref)
+{
+	unsigned char *b = skb_tail_pointer(skb);
+	struct tcf_tunnel_key *t = to_tunnel_key(a);
+	struct tcf_tunnel_key_params *params;
+	struct tc_tunnel_key opt = {
+		.index    = t->tcf_index,
+		.refcnt   = t->tcf_refcnt - ref,
+		.bindcnt  = t->tcf_bindcnt - bind,
+	};
+	struct tcf_t tm;
+	int ret = -1;
+
+	rcu_read_lock();
+	params = rcu_dereference(t->params);
+
+	opt.t_action = params->tcft_action;
+	opt.action = params->action;
+
+	if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
+		goto nla_put_failure;
+
+	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
+		struct ip_tunnel_key *key =
+			&params->tcft_enc_metadata->u.tun_info.key;
+		__be32 key_id = tunnel_id_to_key32(key->tun_id);
+
+		if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
+		    tunnel_key_dump_addresses(skb,
+					      &params->tcft_enc_metadata->u.tun_info))
+			goto nla_put_failure;
+	}
+
+	tcf_tm_dump(&tm, &t->tcf_tm);
+	if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
+			  &tm, TCA_TUNNEL_KEY_PAD))
+		goto nla_put_failure;
+
+	ret = skb->len;
+	goto out;
+
+nla_put_failure:
+	nlmsg_trim(skb, b);
+out:
+	rcu_read_unlock();
+
+	return ret;
+}
+
+static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
+			     struct netlink_callback *cb, int type,
+			     const struct tc_action_ops *ops)
+{
+	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
+
+	return tcf_generic_walker(tn, skb, cb, type, ops);
+}
+
+static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
+{
+	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
+
+	return tcf_hash_search(tn, a, index);
+}
+
+static struct tc_action_ops act_tunnel_key_ops = {
+	.kind		=	"tunnel_key",
+	.type		=	TCA_ACT_TUNNEL_KEY,
+	.owner		=	THIS_MODULE,
+	.act		=	tunnel_key_act,
+	.dump		=	tunnel_key_dump,
+	.init		=	tunnel_key_init,
+	.cleanup	=	tunnel_key_release,
+	.walk		=	tunnel_key_walker,
+	.lookup		=	tunnel_key_search,
+	.size		=	sizeof(struct tcf_tunnel_key),
+};
+
+static __net_init int tunnel_key_init_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
+
+	return tc_action_net_init(tn, &act_tunnel_key_ops, TUNNEL_KEY_TAB_MASK);
+}
+
+static void __net_exit tunnel_key_exit_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
+
+	tc_action_net_exit(tn);
+}
+
+static struct pernet_operations tunnel_key_net_ops = {
+	.init = tunnel_key_init_net,
+	.exit = tunnel_key_exit_net,
+	.id   = &tunnel_key_net_id,
+	.size = sizeof(struct tc_action_net),
+};
+
+static int __init tunnel_key_init_module(void)
+{
+	return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
+}
+
+static void __exit tunnel_key_cleanup_module(void)
+{
+	tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
+}
+
+module_init(tunnel_key_init_module);
+module_exit(tunnel_key_cleanup_module);
+
+MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
+MODULE_DESCRIPTION("ip tunnel manipulation actions");
+MODULE_LICENSE("GPL v2");