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A sequence counter write section must be serialized or its internal state can get corrupted. A plain seqcount_t does not contain the information of which lock must be held to guaranteee write side serialization. For xfrm_state_hash_generation, use seqcount_spinlock_t instead of plain seqcount_t. This allows to associate the spinlock used for write serialization with the sequence counter. It thus enables lockdep to verify that the write serialization lock is indeed held before entering the sequence counter write section. If lockdep is disabled, this lock association is compiled out and has neither storage size nor runtime overhead. Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NETNS_XFRM_H
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#define __NETNS_XFRM_H
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/rhashtable-types.h>
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#include <linux/xfrm.h>
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#include <net/dst_ops.h>
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struct ctl_table_header;
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struct xfrm_policy_hash {
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struct hlist_head __rcu *table;
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unsigned int hmask;
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u8 dbits4;
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u8 sbits4;
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u8 dbits6;
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u8 sbits6;
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};
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struct xfrm_policy_hthresh {
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struct work_struct work;
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seqlock_t lock;
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u8 lbits4;
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u8 rbits4;
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u8 lbits6;
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u8 rbits6;
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};
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struct netns_xfrm {
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struct list_head state_all;
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/*
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* Hash table to find appropriate SA towards given target (endpoint of
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* tunnel or destination of transport mode) allowed by selector.
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*
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* Main use is finding SA after policy selected tunnel or transport
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* mode. Also, it can be used by ah/esp icmp error handler to find
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* offending SA.
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*/
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struct hlist_head __rcu *state_bydst;
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struct hlist_head __rcu *state_bysrc;
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struct hlist_head __rcu *state_byspi;
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unsigned int state_hmask;
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unsigned int state_num;
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struct work_struct state_hash_work;
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struct list_head policy_all;
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struct hlist_head *policy_byidx;
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unsigned int policy_idx_hmask;
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struct hlist_head policy_inexact[XFRM_POLICY_MAX];
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struct xfrm_policy_hash policy_bydst[XFRM_POLICY_MAX];
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unsigned int policy_count[XFRM_POLICY_MAX * 2];
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struct work_struct policy_hash_work;
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struct xfrm_policy_hthresh policy_hthresh;
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struct list_head inexact_bins;
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struct sock *nlsk;
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struct sock *nlsk_stash;
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u32 sysctl_aevent_etime;
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u32 sysctl_aevent_rseqth;
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int sysctl_larval_drop;
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u32 sysctl_acq_expires;
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#ifdef CONFIG_SYSCTL
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struct ctl_table_header *sysctl_hdr;
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#endif
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struct dst_ops xfrm4_dst_ops;
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#if IS_ENABLED(CONFIG_IPV6)
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struct dst_ops xfrm6_dst_ops;
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#endif
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spinlock_t xfrm_state_lock;
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seqcount_spinlock_t xfrm_state_hash_generation;
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spinlock_t xfrm_policy_lock;
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struct mutex xfrm_cfg_mutex;
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};
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#endif
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