Support '==' and '!=' predicates for IPv4 address format; for example
cd /sys/kernel/debug/tracing/events/tcp/tcp_receive_reset echo "saddr == 127.0.0.1" > filter
Signed-off-by: Alan Maguire alan.maguire@oracle.com --- kernel/trace/trace_events_filter.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 64f1dfb72cb5..d8e08d3c3594 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -1384,6 +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 */ u8 *pred_val; char *field_name; char *name; @@ -1646,6 +1647,24 @@ static int parse_pred(const char *str, void *data, /* go past the last quote */ i++;
+ } else if (field->size == 4 && + sscanf(&str[i], "%hhd.%hhd.%hhd.%hhd", + /* assume address in network byte order */ + &scratch[0], &scratch[1], &scratch[2], &scratch[3]) == 4) { + /* For IPv4 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 (isdigit(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;