From: Johannes Berg <johannes.berg@xxxxxxxxx>
Rework the data structures to hide element parsing internals
from the users.
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/ieee80211_i.h | 14 -----
net/mac80211/parse.c | 118 ++++++++++++++++++++++++-------------
net/mac80211/tests/elems.c | 4 +-
3 files changed, 78 insertions(+), 58 deletions(-)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 768f614731a7..a8ac238bd197 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1766,12 +1766,6 @@ struct ieee802_11_elems {
size_t ml_basic_len;
size_t ml_reconf_len;
- /* The basic Multi-Link element in the original elements */
- const struct element *ml_basic_elem;
-
- /* The reconfiguration Multi-Link element in the original elements */
- const struct element *ml_reconf_elem;
-
u8 ttlm_num;
/*
@@ -1784,14 +1778,6 @@ struct ieee802_11_elems {
/* whether/which parse error occurred while retrieving these elements */
u8 parse_error;
-
- /*
- * scratch buffer that can be used for various element parsing related
- * tasks, e.g., element de-fragmentation etc.
- */
- size_t scratch_len;
- u8 *scratch_pos;
- u8 scratch[] __counted_by(scratch_len);
};
static inline struct ieee80211_local *hw_to_local(
diff --git a/net/mac80211/parse.c b/net/mac80211/parse.c
index 73e52504ed97..55e5497f8978 100644
--- a/net/mac80211/parse.c
+++ b/net/mac80211/parse.c
@@ -34,12 +34,32 @@
#include "led.h"
#include "wep.h"
+struct ieee80211_elems_parse {
+ /* must be first for kfree to work */
+ struct ieee802_11_elems elems;
+
+ /* The basic Multi-Link element in the original elements */
+ const struct element *ml_basic_elem;
+
+ /* The reconfiguration Multi-Link element in the original elements */
+ const struct element *ml_reconf_elem;
+
+ /*
+ * scratch buffer that can be used for various element parsing related
+ * tasks, e.g., element de-fragmentation etc.
+ */
+ size_t scratch_len;
+ u8 *scratch_pos;
+ u8 scratch[] __counted_by(scratch_len);
+};
+
static void
ieee80211_parse_extension_element(u32 *crc,
const struct element *elem,
- struct ieee802_11_elems *elems,
+ struct ieee80211_elems_parse *elems_parse,
struct ieee80211_elems_parse_params *params)
{
+ struct ieee802_11_elems *elems = &elems_parse->elems;
const void *data = elem->data + 1;
bool calc_crc = false;
u8 len;
@@ -129,15 +149,15 @@ ieee80211_parse_extension_element(u32 *crc,
switch (le16_get_bits(mle->control,
IEEE80211_ML_CONTROL_TYPE)) {
case IEEE80211_ML_CONTROL_TYPE_BASIC:
- if (elems->ml_basic_elem) {
+ if (elems_parse->ml_basic_elem) {
elems->parse_error |=
IEEE80211_PARSE_ERR_DUP_NEST_ML_BASIC;
break;
}
- elems->ml_basic_elem = (void *)elem;
+ elems_parse->ml_basic_elem = elem;
break;
case IEEE80211_ML_CONTROL_TYPE_RECONF:
- elems->ml_reconf_elem = (void *)elem;
+ elems_parse->ml_reconf_elem = elem;
break;
default:
break;
@@ -169,9 +189,10 @@ ieee80211_parse_extension_element(u32 *crc,
static u32
_ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
- struct ieee802_11_elems *elems,
+ struct ieee80211_elems_parse *elems_parse,
const struct element *check_inherit)
{
+ struct ieee802_11_elems *elems = &elems_parse->elems;
const struct element *elem;
bool calc_crc = params->filter != 0;
DECLARE_BITMAP(seen_elems, 256);
@@ -586,7 +607,8 @@ _ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
case WLAN_EID_EXTENSION:
ieee80211_parse_extension_element(calc_crc ?
&crc : NULL,
- elem, elems, params);
+ elem, elems_parse,
+ params);
break;
case WLAN_EID_S1G_CAPABILITIES:
if (params->mode != IEEE80211_CONN_MODE_S1G)
@@ -709,9 +731,11 @@ static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
return found ? profile_len : 0;
}
-static void ieee80211_mle_get_sta_prof(struct ieee802_11_elems *elems,
- u8 link_id)
+static void
+ieee80211_mle_get_sta_prof(struct ieee80211_elems_parse *elems_parse,
+ u8 link_id)
{
+ struct ieee802_11_elems *elems = &elems_parse->elems;
const struct ieee80211_multi_link_elem *ml = elems->ml_basic;
ssize_t ml_len = elems->ml_basic_len;
const struct element *sub;
@@ -741,26 +765,27 @@ static void ieee80211_mle_get_sta_prof(struct ieee802_11_elems *elems,
sta_prof_len =
cfg80211_defragment_element(sub,
(u8 *)ml, ml_len,
- elems->scratch_pos,
- elems->scratch +
- elems->scratch_len -
- elems->scratch_pos,
+ elems_parse->scratch_pos,
+ elems_parse->scratch +
+ elems_parse->scratch_len -
+ elems_parse->scratch_pos,
IEEE80211_MLE_SUBELEM_FRAGMENT);
if (sta_prof_len < 0)
return;
- elems->prof = (void *)elems->scratch_pos;
+ elems->prof = (void *)elems_parse->scratch_pos;
elems->sta_prof_len = sta_prof_len;
- elems->scratch_pos += sta_prof_len;
+ elems_parse->scratch_pos += sta_prof_len;
return;
}
}
-static void ieee80211_mle_parse_link(struct ieee802_11_elems *elems,
+static void ieee80211_mle_parse_link(struct ieee80211_elems_parse *elems_parse,
struct ieee80211_elems_parse_params *params)
{
+ struct ieee802_11_elems *elems = &elems_parse->elems;
struct ieee80211_mle_per_sta_profile *prof;
struct ieee80211_elems_parse_params sub = {
.mode = params->mode,
@@ -772,26 +797,26 @@ static void ieee80211_mle_parse_link(struct ieee802_11_elems *elems,
const struct element *non_inherit = NULL;
const u8 *end;
- ml_len = cfg80211_defragment_element(elems->ml_basic_elem,
+ ml_len = cfg80211_defragment_element(elems_parse->ml_basic_elem,
elems->ie_start,
elems->total_len,
- elems->scratch_pos,
- elems->scratch +
- elems->scratch_len -
- elems->scratch_pos,
+ elems_parse->scratch_pos,
+ elems_parse->scratch +
+ elems_parse->scratch_len -
+ elems_parse->scratch_pos,
WLAN_EID_FRAGMENT);
if (ml_len < 0)
return;
- elems->ml_basic = (const void *)elems->scratch_pos;
+ elems->ml_basic = (const void *)elems_parse->scratch_pos;
elems->ml_basic_len = ml_len;
- elems->scratch_pos += ml_len;
+ elems_parse->scratch_pos += ml_len;
if (params->link_id == -1)
return;
- ieee80211_mle_get_sta_prof(elems, params->link_id);
+ ieee80211_mle_get_sta_prof(elems_parse, params->link_id);
prof = elems->prof;
if (!prof)
@@ -816,57 +841,66 @@ static void ieee80211_mle_parse_link(struct ieee802_11_elems *elems,
non_inherit = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
sub.start, sub.len);
- _ieee802_11_parse_elems_full(&sub, elems, non_inherit);
+ _ieee802_11_parse_elems_full(&sub, elems_parse, non_inherit);
}
static void
-ieee80211_mle_defrag_reconf(struct ieee802_11_elems *elems)
+ieee80211_mle_defrag_reconf(struct ieee80211_elems_parse *elems_parse)
{
+ struct ieee802_11_elems *elems = &elems_parse->elems;
ssize_t ml_len;
- ml_len = cfg80211_defragment_element(elems->ml_reconf_elem,
+ ml_len = cfg80211_defragment_element(elems_parse->ml_reconf_elem,
elems->ie_start,
elems->total_len,
- elems->scratch_pos,
- elems->scratch +
- elems->scratch_len -
- elems->scratch_pos,
+ elems_parse->scratch_pos,
+ elems_parse->scratch +
+ elems_parse->scratch_len -
+ elems_parse->scratch_pos,
WLAN_EID_FRAGMENT);
if (ml_len < 0)
return;
- elems->ml_reconf = (void *)elems->scratch_pos;
+ elems->ml_reconf = (void *)elems_parse->scratch_pos;
elems->ml_reconf_len = ml_len;
- elems->scratch_pos += ml_len;
+ elems_parse->scratch_pos += ml_len;
}
struct ieee802_11_elems *
ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params)
{
+ struct ieee80211_elems_parse *elems_parse;
struct ieee802_11_elems *elems;
const struct element *non_inherit = NULL;
u8 *nontransmitted_profile;
int nontransmitted_profile_len = 0;
size_t scratch_len = 3 * params->len;
- elems = kzalloc(struct_size(elems, scratch, scratch_len), GFP_ATOMIC);
- if (!elems)
+ BUILD_BUG_ON(offsetof(typeof(*elems_parse), elems) != 0);
+
+ elems_parse = kzalloc(struct_size(elems_parse, scratch, scratch_len),
+ GFP_ATOMIC);
+ if (!elems_parse)
return NULL;
+
+ elems_parse->scratch_len = scratch_len;
+ elems_parse->scratch_pos = elems_parse->scratch;
+
+ elems = &elems_parse->elems;
elems->ie_start = params->start;
elems->total_len = params->len;
- elems->scratch_len = scratch_len;
- elems->scratch_pos = elems->scratch;
- nontransmitted_profile = elems->scratch_pos;
+ nontransmitted_profile = elems_parse->scratch_pos;
nontransmitted_profile_len =
ieee802_11_find_bssid_profile(params->start, params->len,
elems, params->bss,
nontransmitted_profile);
- elems->scratch_pos += nontransmitted_profile_len;
+ elems_parse->scratch_pos += nontransmitted_profile_len;
non_inherit = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
nontransmitted_profile,
nontransmitted_profile_len);
- elems->crc = _ieee802_11_parse_elems_full(params, elems, non_inherit);
+ elems->crc = _ieee802_11_parse_elems_full(params, elems_parse,
+ non_inherit);
/* Override with nontransmitted profile, if found */
if (nontransmitted_profile_len) {
@@ -878,12 +912,12 @@ ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params)
.link_id = params->link_id,
};
- _ieee802_11_parse_elems_full(&sub, elems, NULL);
+ _ieee802_11_parse_elems_full(&sub, elems_parse, NULL);
}
- ieee80211_mle_parse_link(elems, params);
+ ieee80211_mle_parse_link(elems_parse, params);
- ieee80211_mle_defrag_reconf(elems);
+ ieee80211_mle_defrag_reconf(elems_parse);
if (elems->tim && !elems->parse_error) {
const struct ieee80211_tim_ie *tim_ie = elems->tim;
diff --git a/net/mac80211/tests/elems.c b/net/mac80211/tests/elems.c
index 30fc0acb7ac2..a413ba29f759 100644
--- a/net/mac80211/tests/elems.c
+++ b/net/mac80211/tests/elems.c
@@ -2,7 +2,7 @@
/*
* KUnit tests for element parsing
*
- * Copyright (C) 2023 Intel Corporation
+ * Copyright (C) 2023-2024 Intel Corporation
*/
#include <kunit/test.h>
#include "../ieee80211_i.h"
@@ -69,7 +69,7 @@ static void mle_defrag(struct kunit *test)
if (IS_ERR_OR_NULL(parsed))
goto free_skb;
- KUNIT_EXPECT_NOT_NULL(test, parsed->ml_basic_elem);
+ KUNIT_EXPECT_NOT_NULL(test, parsed->ml_basic);
KUNIT_EXPECT_EQ(test,
parsed->ml_basic_len,
2 /* control */ +
--
2.43.2
