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Limit UDP GSO number of segments in a message to the allowed value #2033

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Merged
bmah888 merged 1 commit into from
May 14, 2026
+7 −2
Merged

Limit UDP GSO number of segments in a message to the allowed value #2033

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1 change: 1 addition & 0 deletions src/iperf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -494,6 +494,7 @@ extern int gerror; /* error value from getaddrinfo(3), for use in internal error
/* In Reverse mode, maximum number of packets to wait for "accept" response - to handle out of order packets */
#define MAX_REVERSE_OUT_OF_ORDER_PACKETS 2

#define GSO_MAX_DG_IN_BF (1 << 7UL) // 128 - the Linux Kernel limit hardcoded as `UDP_MAX_SEGMENTS (1 << 7UL)` in `udpgso.c`
#define GSO_BF_MAX_SIZE MAX_UDP_BLOCKSIZE
#define GRO_BF_MAX_SIZE MAX_UDP_BLOCKSIZE

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8 changes: 6 additions & 2 deletions src/iperf_client_api.c
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Expand Up @@ -420,7 +420,7 @@ iperf_handle_message_client(struct iperf_test *test)
int
iperf_connect(struct iperf_test *test)
{
int opt;
int opt, n;
socklen_t len;

if (NULL == test)
Expand Down Expand Up @@ -526,7 +526,11 @@ iperf_connect(struct iperf_test *test)
test->settings->gso_dg_size = test->settings->blksize;
/* use the multiple of datagram size for the best efficiency. */
if (test->settings->gso_dg_size > 0) {
test->settings->gso_bf_size = (test->settings->gso_bf_size / test->settings->gso_dg_size) * test->settings->gso_dg_size;
n = test->settings->gso_bf_size / test->settings->gso_dg_size;
if (n > GSO_MAX_DG_IN_BF) {
n = GSO_MAX_DG_IN_BF;
}
test->settings->gso_bf_size = n * test->settings->gso_dg_size;
} else {
/* If gso_dg_size is 0 (unlimited bandwidth), use default UDP datagram size */
test->settings->gso_dg_size = DEFAULT_UDP_BLKSIZE;
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