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monitor: Support arbitrarily long bitfields

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Support arbitrarily long bitfields by providing field and mask values
as arrays with their length measured in bytes. Some of the IE fields
easily reach 80 bits or more, thus easily overrunning any integer sizes
used by the OS architecture.
This commit is contained in:
Patrik Flykt 2015-03-06 13:36:43 +02:00 committed by Denis Kenzior
parent 1637f3519a
commit 6d652fb743
1 changed files with 19 additions and 11 deletions
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30
monitor/nlmon.c
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@ -681,12 +681,16 @@ static const char *rsn_capabilities_bitfield[] = {
}; };
static void print_ie_bitfield(unsigned int level, const char *label, static void print_ie_bitfield(unsigned int level, const char *label,
uint64_t bits, const char *bitfield_table[]) const uint8_t *bytes, const uint8_t *mask, size_t len,
const char *bitfield_table[])
{ {
unsigned int i; unsigned int i;
for (i = 0; bitfield_table[i]; i++) { for (i = 0; i < len * 8; i++) {
if (!(bits & 1 << i)) uint8_t byte = i / 8;
uint8_t bit = i % 8;
if (!util_is_bit_set(bytes[byte] & mask[byte], bit))
continue; continue;
print_attr(level, "%s: bit %2d: %s", label, i, print_attr(level, "%s: bit %2d: %s", label, i,
@ -699,7 +703,8 @@ static void print_ie_rsn(unsigned int level, const char *label,
{ {
const void *end = data + size; const void *end = data + size;
uint16_t version, count, rsn_capa; uint16_t version, count;
uint8_t bytemask[2];
int i; int i;
const char *rsn_capabilities_replay_counter[] = { const char *rsn_capabilities_replay_counter[] = {
"1 replay counter", "1 replay counter",
@ -760,22 +765,25 @@ static void print_ie_rsn(unsigned int level, const char *label,
if (end - data < 2) if (end - data < 2)
goto end; goto end;
rsn_capa = l_get_le16(data);
data += 2; data += 2;
print_ie_bitfield(level + 1, "RSN capabilities", rsn_capa & 0x0003, bytemask[0] = 0x03;
rsn_capabilities_bitfield); bytemask[1] = 0x00;
print_ie_bitfield(level + 1, "RSN capabilities", data, bytemask,
sizeof(bytemask), rsn_capabilities_bitfield);
count = (rsn_capa & 0x000c) >> 2; count = (*((uint8_t *)data) & 0x0c) >> 2;
print_attr(level + 1, "RSN capabilities: bits 3 - 4: %s per PTKSA", print_attr(level + 1, "RSN capabilities: bits 3 - 4: %s per PTKSA",
rsn_capabilities_replay_counter[count]); rsn_capabilities_replay_counter[count]);
count = (rsn_capa & 0x0030) >> 4; count = (*((uint8_t *)data) & 0x30) >> 4;
print_attr(level + 1, "RSN capabilities: bits 5 - 6: %s per GTKSA", print_attr(level + 1, "RSN capabilities: bits 5 - 6: %s per GTKSA",
rsn_capabilities_replay_counter[count]); rsn_capabilities_replay_counter[count]);
print_ie_bitfield(level + 1, "RSN capabilities", rsn_capa & 0xffc0, bytemask[0] = 0xc0;
rsn_capabilities_bitfield); bytemask[1] = 0xff;
print_ie_bitfield(level + 1, "RSN capabilities", data, bytemask,
sizeof(bytemask), rsn_capabilities_bitfield);
if (end - data < 2) if (end - data < 2)
goto end; goto end;