Support '==' and '!=' predicates for MAC address format;
for example
cd /sys/kernel/debug/tracing/events/cfg80211/rdev_get_key
echo "mac_addr == de:ad:be:ef:de:ad"
Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
---
kernel/trace/trace_events_filter.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index e2521574f3c4..f38023f490b1 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1384,7 +1384,7 @@ static int parse_pred(const char *str, void *data,
unsigned long size;
unsigned long ip;
char num_buf[24]; /* Big enough to hold an address */
- char scratch[4]; /* Big enough to hold an IPv4 address */
+ char scratch[6]; /* Big enough to hold a MAC address */
u8 *pred_val;
char *field_name;
char *name;
@@ -1738,6 +1738,24 @@ static int parse_pred(const char *str, void *data,
if (pred->op == OP_NE)
pred->not = 1;
+ } else if (field->size == 6 &&
+ sscanf(&str[i], "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+ &scratch[0], &scratch[1], &scratch[2], &scratch[3],
+ &scratch[4], &scratch[5]) == 6) {
+ /* For MAC addresses, only '==' or '!=' are supported. */
+ if (pred->op != OP_EQ && pred->op != OP_NE) {
+ parse_error(pe, FILT_ERR_ILLEGAL_FIELD_OP, pos + i);
+ goto err_free;
+ }
+ while (isalnum(str[i]) || str[i] == ':')
+ i++;
+ pred_val = kzalloc(field->size, GFP_KERNEL);
+ memcpy(pred_val, scratch, field->size);
+ pred->val = (u64)pred_val;
+ pred->fn_num = FILTER_PRED_FN_MEMCMP;
+ if (pred->op == OP_NE)
+ pred->not = 1;
+
} else if (str[i] == '0' && tolower(str[i + 1]) == 'x' &&
field->size > 8) {
/* For sizes > 8 bytes, we store hex bytes for comparison;
--
2.31.1
