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-rw-r--r--src/vnet/ipsec/esp_encrypt.c44
1 files changed, 21 insertions, 23 deletions
diff --git a/src/vnet/ipsec/esp_encrypt.c b/src/vnet/ipsec/esp_encrypt.c
index 730a2b83c11..186e122793d 100644
--- a/src/vnet/ipsec/esp_encrypt.c
+++ b/src/vnet/ipsec/esp_encrypt.c
@@ -91,7 +91,9 @@ format_esp_encrypt_trace (u8 * s, va_list * args)
/* pad packet in input buffer */
static_always_inline u8 *
-esp_add_footer_and_icv (vlib_buffer_t * b, u8 block_size, u8 icv_sz)
+esp_add_footer_and_icv (vlib_buffer_t * b, u8 block_size, u8 icv_sz,
+ u16 * next, vlib_node_runtime_t * node,
+ u16 buffer_data_size)
{
static const u8 pad_data[ESP_MAX_BLOCK_SIZE] = {
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
@@ -104,8 +106,15 @@ esp_add_footer_and_icv (vlib_buffer_t * b, u8 block_size, u8 icv_sz)
esp_footer_t *f = (esp_footer_t *) (vlib_buffer_get_current (b) +
new_length - sizeof (esp_footer_t));
+ if (b->current_data + new_length + icv_sz > buffer_data_size)
+ {
+ b->error = node->errors[ESP_ENCRYPT_ERROR_NO_TRAILER_SPACE];
+ next[0] = ESP_ENCRYPT_NEXT_DROP;
+ return 0;
+ }
+
if (pad_bytes)
- clib_memcpy_fast ((u8 *) f - pad_bytes, pad_data, ESP_MAX_BLOCK_SIZE);
+ clib_memcpy_fast ((u8 *) f - pad_bytes, pad_data, pad_bytes);
f->pad_length = pad_bytes;
b->current_length = new_length + icv_sz;
@@ -188,19 +197,6 @@ esp_get_ip6_hdr_len (ip6_header_t * ip6)
return len;
}
-static_always_inline int
-esp_trailer_icv_overflow (vlib_node_runtime_t * node, vlib_buffer_t * b,
- u16 * next, u16 buffer_data_size)
-{
- if (b->current_data + b->current_length <= buffer_data_size)
- return 0;
-
- b->current_length -= buffer_data_size - b->current_data;
- b->error = node->errors[ESP_ENCRYPT_ERROR_NO_TRAILER_SPACE];
- next[0] = ESP_ENCRYPT_NEXT_DROP;
- return 1;
-}
-
static_always_inline void
esp_process_ops (vlib_main_t * vm, vlib_node_runtime_t * node,
vnet_crypto_op_t * ops, vlib_buffer_t * b[], u16 * nexts)
@@ -326,11 +322,12 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
if (ipsec_sa_is_set_IS_TUNNEL (sa0))
{
payload = vlib_buffer_get_current (b[0]);
- next_hdr_ptr = esp_add_footer_and_icv (b[0], block_sz, icv_sz);
- payload_len = b[0]->current_length;
-
- if (esp_trailer_icv_overflow (node, b[0], next, buffer_data_size))
+ next_hdr_ptr = esp_add_footer_and_icv (b[0], block_sz, icv_sz,
+ next, node,
+ buffer_data_size);
+ if (!next_hdr_ptr)
goto trace;
+ payload_len = b[0]->current_length;
/* ESP header */
hdr_len += sizeof (*esp);
@@ -389,11 +386,12 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_buffer_advance (b[0], ip_len);
payload = vlib_buffer_get_current (b[0]);
- next_hdr_ptr = esp_add_footer_and_icv (b[0], block_sz, icv_sz);
- payload_len = b[0]->current_length;
-
- if (esp_trailer_icv_overflow (node, b[0], next, buffer_data_size))
+ next_hdr_ptr = esp_add_footer_and_icv (b[0], block_sz, icv_sz,
+ next, node,
+ buffer_data_size);
+ if (!next_hdr_ptr)
goto trace;
+ payload_len = b[0]->current_length;
/* ESP header */
hdr_len += sizeof (*esp);