358 lines
9.1 KiB
C
358 lines
9.1 KiB
C
/*
|
|
* 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 <linux/tc_act/tc_tunnel_key.h>
|
|
#include <net/tc_act/tc_tunnel_key.h>
|
|
|
|
static unsigned 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 },
|
|
[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
|
|
[TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
|
|
};
|
|
|
|
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;
|
|
__be16 dst_port = 0;
|
|
__be64 key_id;
|
|
__be16 flags;
|
|
int ret = 0;
|
|
int err;
|
|
|
|
if (!nla)
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
|
|
NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[TCA_TUNNEL_KEY_PARMS])
|
|
return -EINVAL;
|
|
|
|
parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
|
|
exists = tcf_idr_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]));
|
|
|
|
flags = TUNNEL_KEY | TUNNEL_CSUM;
|
|
if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
|
|
nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
|
|
flags &= ~TUNNEL_CSUM;
|
|
|
|
if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
|
|
dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
|
|
|
|
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,
|
|
dst_port, flags,
|
|
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, dst_port,
|
|
0, flags,
|
|
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_idr_create(tn, parm->index, est, a,
|
|
&act_tunnel_key_ops, bind, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ACT_P_CREATED;
|
|
} else {
|
|
tcf_idr_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_idr_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_idr_insert(tn, *a);
|
|
|
|
return ret;
|
|
|
|
err_out:
|
|
if (exists)
|
|
tcf_idr_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;
|
|
|
|
params = rcu_dereference_protected(t->params, 1);
|
|
|
|
if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
|
|
dst_release(¶ms->tcft_enc_metadata->dst);
|
|
|
|
kfree_rcu(params, rcu);
|
|
}
|
|
|
|
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;
|
|
|
|
params = rtnl_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) ||
|
|
nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst) ||
|
|
nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
|
|
!(key->tun_flags & TUNNEL_CSUM)))
|
|
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;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
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_idr_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);
|
|
}
|
|
|
|
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");
|