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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Sven Eckelmann
b7293c6e8c
Before batman-adv is allowed to write to an skb, it either has to have its
own copy of the skb or use skb_cow() to ensure that the data part is not
shared. But batadv_frag_skb_fwd() modifies the TTL even when it is shared.
Adding a skb_cow() right before this operation avoids this and can at the
same time prepare it for the modifications required to forward the
fragment.
Cc: stable@kernel.org
Fixes: 610bfc6bc9 ("batman-adv: Receive fragmented packets and merge")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) B.A.T.M.A.N. contributors:
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*
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* Martin Hundebøll <martin@hundeboll.net>
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*/
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#ifndef _NET_BATMAN_ADV_FRAGMENTATION_H_
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#define _NET_BATMAN_ADV_FRAGMENTATION_H_
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#include "main.h"
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#include <linux/compiler.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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void batadv_frag_purge_orig(struct batadv_orig_node *orig,
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bool (*check_cb)(struct batadv_frag_table_entry *));
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bool batadv_frag_skb_fwd(struct sk_buff *skb,
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struct batadv_hard_iface *recv_if,
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struct batadv_orig_node *orig_node_src,
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int *rx_result);
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bool batadv_frag_skb_buffer(struct sk_buff **skb,
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struct batadv_orig_node *orig_node);
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int batadv_frag_send_packet(struct sk_buff *skb,
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struct batadv_orig_node *orig_node,
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struct batadv_neigh_node *neigh_node);
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/**
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* batadv_frag_check_entry() - check if a list of fragments has timed out
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* @frags_entry: table entry to check
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*
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* Return: true if the frags entry has timed out, false otherwise.
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*/
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static inline bool
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batadv_frag_check_entry(struct batadv_frag_table_entry *frags_entry)
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{
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if (!hlist_empty(&frags_entry->fragment_list) &&
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batadv_has_timed_out(frags_entry->timestamp, BATADV_FRAG_TIMEOUT))
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return true;
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return false;
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}
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#endif /* _NET_BATMAN_ADV_FRAGMENTATION_H_ */
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