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authorOle Troan <ot@cisco.com>2018-08-10 14:39:48 +0200
committerDave Barach <openvpp@barachs.net>2018-08-10 20:31:13 +0000
commit7eb9d9608b5b47b95f4860b2c470411658f7cdac (patch)
treebcec2ab0d367f26dd63a64882d2b1986751ccc97 /src
parent993683150202254c6ba8dd43e087a7229edd5d4c (diff)
IP fragmentation buffer chains, part 2.
Change-Id: I8d1072cf9ff9f502302fd906c5590e0f3698dc60 Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src')
-rw-r--r--src/vnet/ip/ip_frag.c40
1 files changed, 21 insertions, 19 deletions
diff --git a/src/vnet/ip/ip_frag.c b/src/vnet/ip/ip_frag.c
index 667a92bbfa5..630948723cd 100644
--- a/src/vnet/ip/ip_frag.c
+++ b/src/vnet/ip/ip_frag.c
@@ -128,7 +128,6 @@ ip4_frag_do_fragment (vlib_main_t * vm, u32 from_bi, u32 ** buffer,
if (!vlib_buffer_alloc (vm, &to_bi, 1))
{
*error = IP_FRAG_ERROR_MEMORY;
- /* XXX: Free already allocated buffers? */
return;
}
vec_add1 (*buffer, to_bi);
@@ -152,12 +151,22 @@ ip4_frag_do_fragment (vlib_main_t * vm, u32 from_bi, u32 ** buffer,
to_ip4 = vlib_buffer_get_current (to_b) + offset;
to_data = (void *) (to_ip4 + 1);
- /* Spin through buffer chain copying data */
- // XXX: Make sure we don't overflow source buffer!!!
- if (len > left_in_from_buffer)
+ /* Spin through from buffers filling up the to buffer */
+ u16 to_ptr = 0;
+ u16 bytes_to_copy, left_in_to_buffer = len;
+ while (1)
{
- clib_memcpy (to_data, from_data + ptr, left_in_from_buffer);
-
+ /* Figure out how many bytes we can safely copy */
+ bytes_to_copy = left_in_to_buffer <= left_in_from_buffer ?
+ left_in_to_buffer : left_in_from_buffer;
+ clib_memcpy (to_data + to_ptr, from_data + ptr, bytes_to_copy);
+ left_in_to_buffer -= bytes_to_copy;
+ ptr += bytes_to_copy;
+ left_in_from_buffer -= bytes_to_copy;
+ if (left_in_to_buffer == 0)
+ break;
+
+ ASSERT (left_in_from_buffer == 0);
/* Move buffer */
if (!(from_b->flags & VLIB_BUFFER_NEXT_PRESENT))
{
@@ -166,18 +175,11 @@ ip4_frag_do_fragment (vlib_main_t * vm, u32 from_bi, u32 ** buffer,
}
from_b = vlib_get_buffer (vm, from_b->next_buffer);
from_data = (u8 *) vlib_buffer_get_current (from_b);
- clib_memcpy (to_data + left_in_from_buffer, from_data,
- len - left_in_from_buffer);
- ptr = len - left_in_from_buffer;
- left_in_from_buffer =
- from_b->current_length - (len - left_in_from_buffer);
- }
- else
- {
- clib_memcpy (to_data, from_data + ptr, len);
- left_in_from_buffer -= len;
- ptr += len;
+ ptr = 0;
+ left_in_from_buffer = from_b->current_length;
+ to_ptr += bytes_to_copy;
}
+
to_b->current_length = offset + len + sizeof (ip4_header_t);
to_ip4->fragment_id = ip_frag_id;
@@ -209,8 +211,6 @@ ip4_frag_do_fragment (vlib_main_t * vm, u32 from_bi, u32 ** buffer,
rem -= len;
fo += len;
}
- /* Free original packet chain */
- vlib_buffer_free_one (vm, from_bi);
}
void
@@ -287,6 +287,8 @@ ip4_frag (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
if (error0 == IP_FRAG_ERROR_NONE)
{
+ /* Free original buffer chain */
+ vlib_buffer_free_one (vm, pi0);
frag_sent += vec_len (buffer);
small_packets += (vec_len (buffer) == 1);
}