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authorArtem Glazychev <artem.glazychev@xored.com>2022-10-25 18:48:40 +0700
committerFan Zhang <fanzhang.oss@gmail.com>2022-11-29 14:15:00 +0000
commitb9e391e7b08ed8f6f32401eae5d6525aab904737 (patch)
tree627fb55cfa24d47a0a643813d43f5977172d8831 /src/plugins
parent3f885f97f0bb812296cb549acd3c4b8fc17de0c9 (diff)
wireguard: compute checksum for outer ipv6 header
Type: fix Signed-off-by: Artem Glazychev <artem.glazychev@xored.com> Change-Id: I477e92712e441c91789afdf9be389d967acfa799
Diffstat (limited to 'src/plugins')
-rw-r--r--src/plugins/wireguard/wireguard_output_tun.c31
-rw-r--r--src/plugins/wireguard/wireguard_send.c12
2 files changed, 41 insertions, 2 deletions
diff --git a/src/plugins/wireguard/wireguard_output_tun.c b/src/plugins/wireguard/wireguard_output_tun.c
index d1b1d6bb8f0..f613d6c0c16 100644
--- a/src/plugins/wireguard/wireguard_output_tun.c
+++ b/src/plugins/wireguard/wireguard_output_tun.c
@@ -307,6 +307,22 @@ error:
return ret;
}
+static_always_inline void
+wg_calc_checksum (vlib_main_t *vm, vlib_buffer_t *b)
+{
+ int bogus = 0;
+ u8 ip_ver_out = (*((u8 *) vlib_buffer_get_current (b)) >> 4);
+
+ /* IPv6 UDP checksum is mandatory */
+ if (ip_ver_out == 6)
+ {
+ ip6_header_t *ip6 =
+ (ip6_header_t *) ((u8 *) vlib_buffer_get_current (b));
+ udp_header_t *udp = ip6_next_header (ip6);
+ udp->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
+ }
+}
+
/* is_ip4 - inner header flag */
always_inline uword
wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
@@ -555,6 +571,14 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
/* wg-output-process-ops */
wg_output_process_ops (vm, node, ptd->crypto_ops, sync_bufs, nexts,
drop_next);
+
+ int n_left_from_sync_bufs = n_sync;
+ while (n_left_from_sync_bufs > 0)
+ {
+ n_left_from_sync_bufs--;
+ wg_calc_checksum (vm, sync_bufs[n_left_from_sync_bufs]);
+ }
+
vlib_buffer_enqueue_to_next (vm, node, sync_bi, nexts, n_sync);
}
if (n_async)
@@ -627,6 +651,11 @@ wg_output_tun_post (vlib_main_t *vm, vlib_node_runtime_t *node,
next[2] = (wg_post_data (b[2]))->next_index;
next[3] = (wg_post_data (b[3]))->next_index;
+ wg_calc_checksum (vm, b[0]);
+ wg_calc_checksum (vm, b[1]);
+ wg_calc_checksum (vm, b[2]);
+ wg_calc_checksum (vm, b[3]);
+
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
{
if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
@@ -671,6 +700,8 @@ wg_output_tun_post (vlib_main_t *vm, vlib_node_runtime_t *node,
while (n_left > 0)
{
+ wg_calc_checksum (vm, b[0]);
+
next[0] = (wg_post_data (b[0]))->next_index;
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b[0]->flags & VLIB_BUFFER_IS_TRACED)))
diff --git a/src/plugins/wireguard/wireguard_send.c b/src/plugins/wireguard/wireguard_send.c
index adfa5cac3de..72fa11034bf 100644
--- a/src/plugins/wireguard/wireguard_send.c
+++ b/src/plugins/wireguard/wireguard_send.c
@@ -41,7 +41,8 @@ ip46_enqueue_packet (vlib_main_t *vm, u32 bi0, int is_ip4)
}
static void
-wg_buffer_prepend_rewrite (vlib_buffer_t *b0, const u8 *rewrite, u8 is_ip4)
+wg_buffer_prepend_rewrite (vlib_main_t *vm, vlib_buffer_t *b0,
+ const u8 *rewrite, u8 is_ip4)
{
if (is_ip4)
{
@@ -72,6 +73,13 @@ wg_buffer_prepend_rewrite (vlib_buffer_t *b0, const u8 *rewrite, u8 is_ip4)
hdr6->ip6.payload_length = hdr6->udp.length =
clib_host_to_net_u16 (b0->current_length - sizeof (ip6_header_t));
+
+ /* IPv6 UDP checksum is mandatory */
+ int bogus = 0;
+ ip6_header_t *ip6_0 = &(hdr6->ip6);
+ hdr6->udp.checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus);
+ ASSERT (bogus == 0);
}
}
@@ -93,7 +101,7 @@ wg_create_buffer (vlib_main_t *vm, const u8 *rewrite, const u8 *packet,
b0->current_length = packet_len;
- wg_buffer_prepend_rewrite (b0, rewrite, is_ip4);
+ wg_buffer_prepend_rewrite (vm, b0, rewrite, is_ip4);
return true;
}