mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-03 17:40:04 +00:00
![Cong Wang](/assets/img/avatar_default.png)
This reverts commit ceffcc5e25
.
If we hold that refcnt, the netns can never be destroyed until
all actions are destroyed by user, this breaks our netns design
which we expect all actions are destroyed when we destroy the
whole netns.
Cc: Lucas Bates <lucasb@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
357 lines
9.1 KiB
C
357 lines
9.1 KiB
C
/*
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* Copyright (c) 2016, Amir Vadai <amir@vadai.me>
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* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/dst.h>
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#include <linux/tc_act/tc_tunnel_key.h>
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#include <net/tc_act/tc_tunnel_key.h>
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static unsigned int tunnel_key_net_id;
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static struct tc_action_ops act_tunnel_key_ops;
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static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params;
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int action;
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rcu_read_lock();
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params = rcu_dereference(t->params);
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tcf_lastuse_update(&t->tcf_tm);
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bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
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action = params->action;
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switch (params->tcft_action) {
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case TCA_TUNNEL_KEY_ACT_RELEASE:
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skb_dst_drop(skb);
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break;
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case TCA_TUNNEL_KEY_ACT_SET:
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skb_dst_drop(skb);
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skb_dst_set(skb, dst_clone(¶ms->tcft_enc_metadata->dst));
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break;
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default:
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WARN_ONCE(1, "Bad tunnel_key action %d.\n",
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params->tcft_action);
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break;
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}
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rcu_read_unlock();
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return action;
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}
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static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
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[TCA_TUNNEL_KEY_PARMS] = { .len = sizeof(struct tc_tunnel_key) },
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[TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
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[TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
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[TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
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[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
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[TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 },
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[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
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[TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
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};
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static int tunnel_key_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind)
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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
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struct tcf_tunnel_key_params *params_old;
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struct tcf_tunnel_key_params *params_new;
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struct metadata_dst *metadata = NULL;
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struct tc_tunnel_key *parm;
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struct tcf_tunnel_key *t;
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bool exists = false;
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__be16 dst_port = 0;
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__be64 key_id;
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__be16 flags;
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int ret = 0;
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int err;
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if (!nla)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
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NULL);
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if (err < 0)
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return err;
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if (!tb[TCA_TUNNEL_KEY_PARMS])
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return -EINVAL;
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parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
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exists = tcf_idr_check(tn, parm->index, a, bind);
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if (exists && bind)
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return 0;
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switch (parm->t_action) {
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case TCA_TUNNEL_KEY_ACT_RELEASE:
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break;
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case TCA_TUNNEL_KEY_ACT_SET:
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if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
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ret = -EINVAL;
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goto err_out;
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}
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key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
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flags = TUNNEL_KEY | TUNNEL_CSUM;
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if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
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nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
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flags &= ~TUNNEL_CSUM;
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if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
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dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
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if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
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tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
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__be32 saddr;
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__be32 daddr;
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saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
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daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
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metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
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dst_port, flags,
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key_id, 0);
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} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
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tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
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struct in6_addr saddr;
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struct in6_addr daddr;
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saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
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daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
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metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
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0, flags,
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key_id, 0);
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}
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if (!metadata) {
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ret = -EINVAL;
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goto err_out;
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}
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metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
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break;
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default:
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goto err_out;
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}
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if (!exists) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_tunnel_key_ops, bind, true);
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if (ret)
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return ret;
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ret = ACT_P_CREATED;
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} else {
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tcf_idr_release(*a, bind);
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if (!ovr)
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return -EEXIST;
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}
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t = to_tunnel_key(*a);
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ASSERT_RTNL();
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params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
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if (unlikely(!params_new)) {
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if (ret == ACT_P_CREATED)
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tcf_idr_release(*a, bind);
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return -ENOMEM;
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}
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params_old = rtnl_dereference(t->params);
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params_new->action = parm->action;
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params_new->tcft_action = parm->t_action;
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params_new->tcft_enc_metadata = metadata;
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rcu_assign_pointer(t->params, params_new);
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if (params_old)
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kfree_rcu(params_old, rcu);
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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return ret;
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err_out:
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if (exists)
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tcf_idr_release(*a, bind);
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return ret;
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}
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static void tunnel_key_release(struct tc_action *a, int bind)
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{
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struct tcf_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params;
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params = rcu_dereference_protected(t->params, 1);
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if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
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dst_release(¶ms->tcft_enc_metadata->dst);
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kfree_rcu(params, rcu);
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}
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static int tunnel_key_dump_addresses(struct sk_buff *skb,
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const struct ip_tunnel_info *info)
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{
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unsigned short family = ip_tunnel_info_af(info);
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if (family == AF_INET) {
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__be32 saddr = info->key.u.ipv4.src;
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__be32 daddr = info->key.u.ipv4.dst;
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if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
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!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
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return 0;
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}
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if (family == AF_INET6) {
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const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
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const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
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if (!nla_put_in6_addr(skb,
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TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
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!nla_put_in6_addr(skb,
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TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
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return 0;
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}
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return -EINVAL;
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}
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static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params;
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struct tc_tunnel_key opt = {
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.index = t->tcf_index,
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.refcnt = t->tcf_refcnt - ref,
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.bindcnt = t->tcf_bindcnt - bind,
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};
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struct tcf_t tm;
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params = rtnl_dereference(t->params);
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opt.t_action = params->tcft_action;
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opt.action = params->action;
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if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
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struct ip_tunnel_key *key =
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¶ms->tcft_enc_metadata->u.tun_info.key;
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__be32 key_id = tunnel_id_to_key32(key->tun_id);
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if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
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tunnel_key_dump_addresses(skb,
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¶ms->tcft_enc_metadata->u.tun_info) ||
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nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst) ||
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nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
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!(key->tun_flags & TUNNEL_CSUM)))
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goto nla_put_failure;
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}
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tcf_tm_dump(&tm, &t->tcf_tm);
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if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
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&tm, TCA_TUNNEL_KEY_PAD))
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops)
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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops);
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}
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static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static struct tc_action_ops act_tunnel_key_ops = {
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.kind = "tunnel_key",
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.type = TCA_ACT_TUNNEL_KEY,
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.owner = THIS_MODULE,
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.act = tunnel_key_act,
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.dump = tunnel_key_dump,
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.init = tunnel_key_init,
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.cleanup = tunnel_key_release,
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.walk = tunnel_key_walker,
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.lookup = tunnel_key_search,
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.size = sizeof(struct tcf_tunnel_key),
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};
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static __net_init int tunnel_key_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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return tc_action_net_init(tn, &act_tunnel_key_ops);
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}
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static void __net_exit tunnel_key_exit_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
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tc_action_net_exit(tn);
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}
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static struct pernet_operations tunnel_key_net_ops = {
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.init = tunnel_key_init_net,
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.exit = tunnel_key_exit_net,
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.id = &tunnel_key_net_id,
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.size = sizeof(struct tc_action_net),
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};
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static int __init tunnel_key_init_module(void)
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{
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return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
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}
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static void __exit tunnel_key_cleanup_module(void)
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{
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tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
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}
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module_init(tunnel_key_init_module);
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module_exit(tunnel_key_cleanup_module);
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MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
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MODULE_DESCRIPTION("ip tunnel manipulation actions");
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MODULE_LICENSE("GPL v2");
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