--- /dev/null
+/*
+ * 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(¶ms->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(¶ms->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 =
+ ¶ms->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,
+ ¶ms->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");
projects / deliverable / linux.git / blobdiff