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1444c175a3
In order to remove dependency on rtnl lock, modify tc_setup_flow_action() to copy tunnel info, instead of just saving pointer to tunnel_key action tunnel info. This is necessary to prevent concurrent action overwrite from releasing tunnel info while it is being used by rtnl-unlocked driver. Implement helper tcf_tunnel_info_copy() that is used to copy tunnel info with all its options to dynamically allocated memory block. Modify tc_cleanup_flow_action() to free dynamically allocated tunnel info. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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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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#ifndef __NET_TC_TUNNEL_KEY_H
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#define __NET_TC_TUNNEL_KEY_H
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#include <net/act_api.h>
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#include <linux/tc_act/tc_tunnel_key.h>
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#include <net/dst_metadata.h>
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struct tcf_tunnel_key_params {
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struct rcu_head rcu;
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int tcft_action;
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struct metadata_dst *tcft_enc_metadata;
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};
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struct tcf_tunnel_key {
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struct tc_action common;
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struct tcf_tunnel_key_params __rcu *params;
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};
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#define to_tunnel_key(a) ((struct tcf_tunnel_key *)a)
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static inline bool is_tcf_tunnel_set(const struct tc_action *a)
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{
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#ifdef CONFIG_NET_CLS_ACT
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struct tcf_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params = rtnl_dereference(t->params);
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if (a->ops && a->ops->id == TCA_ID_TUNNEL_KEY)
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return params->tcft_action == TCA_TUNNEL_KEY_ACT_SET;
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#endif
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return false;
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}
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static inline bool is_tcf_tunnel_release(const struct tc_action *a)
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{
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#ifdef CONFIG_NET_CLS_ACT
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struct tcf_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params = rtnl_dereference(t->params);
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if (a->ops && a->ops->id == TCA_ID_TUNNEL_KEY)
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return params->tcft_action == TCA_TUNNEL_KEY_ACT_RELEASE;
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#endif
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return false;
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}
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static inline struct ip_tunnel_info *tcf_tunnel_info(const struct tc_action *a)
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{
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#ifdef CONFIG_NET_CLS_ACT
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struct tcf_tunnel_key *t = to_tunnel_key(a);
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struct tcf_tunnel_key_params *params = rtnl_dereference(t->params);
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return ¶ms->tcft_enc_metadata->u.tun_info;
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#else
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return NULL;
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#endif
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}
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static inline struct ip_tunnel_info *
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tcf_tunnel_info_copy(const struct tc_action *a)
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{
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#ifdef CONFIG_NET_CLS_ACT
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struct ip_tunnel_info *tun = tcf_tunnel_info(a);
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if (tun) {
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size_t tun_size = sizeof(*tun) + tun->options_len;
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struct ip_tunnel_info *tun_copy = kmemdup(tun, tun_size,
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GFP_KERNEL);
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return tun_copy;
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}
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#endif
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return NULL;
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}
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#endif /* __NET_TC_TUNNEL_KEY_H */
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