batman-adv: Make NC capability changes atomic
Bitwise OR/AND assignments in C aren't guaranteed to be atomic. One
OGM handler might undo the set/clear of a specific bit from another
handler run in between.
Fix this by using the atomic set_bit()/clear_bit()/test_bit() functions.
Fixes: 3f4841ffb3
("batman-adv: tvlv - add network coding container")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
This commit is contained in:
parent
65d7d46050
commit
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@ -19,6 +19,7 @@
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/byteorder/generic.h>
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#include <linux/compiler.h>
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#include <linux/debugfs.h>
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@ -134,9 +135,9 @@ static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
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uint16_t tvlv_value_len)
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{
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if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND)
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orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_NC;
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clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities);
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else
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orig->capabilities |= BATADV_ORIG_CAPA_HAS_NC;
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set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities);
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}
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/**
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@ -894,7 +895,7 @@ void batadv_nc_update_nc_node(struct batadv_priv *bat_priv,
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goto out;
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/* check if orig node is network coding enabled */
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if (!(orig_node->capabilities & BATADV_ORIG_CAPA_HAS_NC))
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if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities))
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goto out;
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/* accept ogms from 'good' neighbors and single hop neighbors */
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@ -314,7 +314,7 @@ struct batadv_orig_node {
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*/
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enum batadv_orig_capabilities {
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BATADV_ORIG_CAPA_HAS_DAT,
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BATADV_ORIG_CAPA_HAS_NC = BIT(1),
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BATADV_ORIG_CAPA_HAS_NC,
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BATADV_ORIG_CAPA_HAS_TT = BIT(2),
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BATADV_ORIG_CAPA_HAS_MCAST = BIT(3),
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};
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