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authorFlorin Coras <fcoras@cisco.com>2021-11-02 17:13:15 -0700
committerDave Barach <openvpp@barachs.net>2021-11-03 15:29:57 +0000
commit505fd37b31aa5a7d242184ebe281dbd4622ad277 (patch)
tree58aa508cf2a399547230d2337a1ee730807aa936 /src/vnet/tcp
parentffd9ddbc4083d8d9d828b415eda33094ff31e5fe (diff)
tcp: make buffer reset function public
Also does a bit of code cleanup. Type: refactor Signed-off-by: Florin Coras <fcoras@cisco.com> Change-Id: Ifbff1e03a2e1fdca98925fdd3db7eb230ff24a37
Diffstat (limited to 'src/vnet/tcp')
-rw-r--r--src/vnet/tcp/tcp.h1
-rw-r--r--src/vnet/tcp/tcp_output.c59
2 files changed, 28 insertions, 32 deletions
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 3ddd324873b..710561fb24a 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -327,6 +327,7 @@ void tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
void tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc);
void tcp_check_gso (tcp_connection_t *tc);
+int tcp_buffer_make_reset (vlib_main_t *vm, vlib_buffer_t *b, u8 is_ip4);
void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
int tcp_configure_v4_source_address_range (vlib_main_t * vm,
ip4_address_t * start,
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 164188efa5c..cfdd1da9188 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -332,25 +332,6 @@ tcp_update_burst_snd_vars (tcp_connection_t * tc)
}
}
-#endif /* CLIB_MARCH_VARIANT */
-
-static void *
-tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
-{
- if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
- vlib_buffer_free_one (vm, b->next_buffer);
- /* Zero all flags but free list index and trace flag */
- b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
- b->current_data = 0;
- b->current_length = 0;
- b->total_length_not_including_first_buffer = 0;
- vnet_buffer (b)->tcp.flags = 0;
- VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
- /* Leave enough space for headers */
- return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
-}
-
-#ifndef CLIB_MARCH_VARIANT
static void *
tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
{
@@ -363,7 +344,6 @@ tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
}
-
/* Compute TCP checksum in software when offloading is disabled for a connection */
u16
ip6_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0,
@@ -568,24 +548,24 @@ tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi,
wrk->tco_next_node[!is_ip4]);
}
-#endif /* CLIB_MARCH_VARIANT */
-
-static int
-tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b, u8 is_ip4)
+int
+tcp_buffer_make_reset (vlib_main_t *vm, vlib_buffer_t *b, u8 is_ip4)
{
- ip4_header_t *ih4;
- ip6_header_t *ih6;
- tcp_header_t *th;
ip4_address_t src_ip4 = {}, dst_ip4 = {};
ip6_address_t src_ip6, dst_ip6;
u16 src_port, dst_port;
u32 tmp, len, seq, ack;
+ ip4_header_t *ih4;
+ ip6_header_t *ih6;
+ tcp_header_t *th;
u8 flags;
- /* Find IP and TCP headers */
+ /*
+ * Find IP and TCP headers and glean information from them. Assumes
+ * buffer was parsed by something like @ref tcp_input_lookup_buffer
+ */
th = tcp_buffer_hdr (b);
- /* Save src and dst ip */
if (is_ip4)
{
ih4 = vlib_buffer_get_current (b);
@@ -625,7 +605,23 @@ tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b, u8 is_ip4)
seq = 0;
}
- tcp_reuse_buffer (vm, b);
+ /*
+ * Clear and reuse current buffer for reset
+ */
+ if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
+ vlib_buffer_free_one (vm, b->next_buffer);
+
+ /* Zero all flags but free list index and trace flag */
+ b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
+ b->current_data = 0;
+ b->current_length = 0;
+ b->total_length_not_including_first_buffer = 0;
+ vnet_buffer (b)->tcp.flags = 0;
+ vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN);
+
+ /*
+ * Add TCP and IP headers
+ */
th = vlib_buffer_push_tcp_net_order (b, dst_port, src_port, seq, ack,
sizeof (tcp_header_t), flags, 0);
@@ -646,7 +642,6 @@ tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b, u8 is_ip4)
return 0;
}
-#ifndef CLIB_MARCH_VARIANT
/**
* Send reset without reusing existing buffer
*
@@ -2368,7 +2363,7 @@ tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
- tcp_make_reset_in_place (vm, b0, is_ip4);
+ tcp_buffer_make_reset (vm, b0, is_ip4);
/* Prepare to send to IP lookup */
vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;