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authorKlement Sekera <ksekera@cisco.com>2020-05-27 12:41:34 +0000
committerOle Trøan <otroan@employees.org>2020-06-04 08:37:28 +0000
commit17a8ab6857f023bc1436d84808acc58dd614203e (patch)
tree5d488cd5f54686d63a32d832682752a610afca02 /src/plugins/nat/nat44_hairpinning.c
parentce412fd7d644a21db9f0a170b88084223b7ee0fe (diff)
nat: add tracing for nat44-hairpinning
Type: improvement Signed-off-by: Klement Sekera <ksekera@cisco.com> Change-Id: Ife437f959e29d3de88bd7ee77221ada86fb03e80
Diffstat (limited to 'src/plugins/nat/nat44_hairpinning.c')
-rw-r--r--src/plugins/nat/nat44_hairpinning.c82
1 files changed, 70 insertions, 12 deletions
diff --git a/src/plugins/nat/nat44_hairpinning.c b/src/plugins/nat/nat44_hairpinning.c
index 02cdfb12380..21e2eee188b 100644
--- a/src/plugins/nat/nat44_hairpinning.c
+++ b/src/plugins/nat/nat44_hairpinning.c
@@ -56,6 +56,36 @@ static char *nat44_hairpin_error_strings[] = {
#undef _
};
+typedef struct
+{
+ ip4_address_t addr;
+ u16 port;
+ u32 fib_index;
+ u32 session_index;
+} nat_hairpin_trace_t;
+
+static u8 *
+format_nat_hairpin_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ nat_hairpin_trace_t *t = va_arg (*args, nat_hairpin_trace_t *);
+
+ s =
+ format (s, "new dst addr %U port %u fib-index %u", format_ip4_address,
+ &t->addr, clib_net_to_host_u16 (t->port), t->fib_index);
+ if (~0 == t->session_index)
+ {
+ s = format (s, " is-static-mapping");
+ }
+ else
+ {
+ s = format (s, " session-index %u", t->session_index);
+ }
+
+ return s;
+}
+
extern vnet_feature_arc_registration_t vnet_feat_arc_ip4_local;
static_always_inline int
@@ -86,18 +116,17 @@ is_hairpinning (snat_main_t * sm, ip4_address_t * dst_addr)
#ifndef CLIB_MARCH_VARIANT
int
-snat_hairpinning (snat_main_t * sm,
- vlib_buffer_t * b0,
- ip4_header_t * ip0,
- udp_header_t * udp0,
- tcp_header_t * tcp0, u32 proto0, int is_ed)
+snat_hairpinning (vlib_main_t * vm, vlib_node_runtime_t * node,
+ snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
+ udp_header_t * udp0, tcp_header_t * tcp0, u32 proto0,
+ int is_ed, int do_trace)
{
snat_session_key_t key0, sm0;
snat_session_t *s0;
clib_bihash_kv_8_8_t kv0, value0;
ip_csum_t sum0;
- u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si;
- u16 new_dst_port0, old_dst_port0;
+ u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si = ~0;
+ u16 new_dst_port0 = ~0, old_dst_port0;
int rv;
key0.addr = ip0->dst_address;
@@ -140,7 +169,10 @@ snat_hairpinning (snat_main_t * sm,
si = value0.value;
}
if (rv)
- return 0;
+ {
+ rv = 0;
+ goto trace;
+ }
s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
new_dst_addr0 = s0->in2out.addr.as_u32;
@@ -187,9 +219,28 @@ snat_hairpinning (snat_main_t * sm,
tcp0->checksum = ip_csum_fold (sum0);
}
}
- return 1;
+ rv = 1;
+ goto trace;
}
- return 0;
+ rv = 0;
+trace:
+ if (do_trace && PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat_hairpin_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->addr.as_u32 = new_dst_addr0;
+ t->port = new_dst_port0;
+ t->fib_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+ if (s0)
+ {
+ t->session_index = si;
+ }
+ else
+ {
+ t->session_index = ~0;
+ }
+ }
+ return rv;
}
#endif
@@ -479,7 +530,9 @@ nat44_hairpinning_fn_inline (vlib_main_t * vm,
vnet_get_config_data (&cm->config_main, &b0->current_config_index,
&next0, 0);
- if (snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, is_ed))
+ if (snat_hairpinning
+ (vm, node, sm, b0, ip0, udp0, tcp0, proto0, is_ed,
+ 1 /* do_trace */ ))
next0 = NAT_HAIRPIN_NEXT_LOOKUP;
pkts_processed += next0 != NAT_HAIRPIN_NEXT_DROP;
@@ -511,6 +564,7 @@ VLIB_REGISTER_NODE (nat44_hairpinning_node) = {
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .format_trace = format_nat_hairpin_trace,
.error_strings = nat44_hairpin_error_strings,
.n_next_nodes = NAT_HAIRPIN_N_NEXT,
.next_nodes = {
@@ -534,6 +588,7 @@ VLIB_REGISTER_NODE (nat44_ed_hairpinning_node) = {
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
.error_strings = nat44_hairpin_error_strings,
+ .format_trace = format_nat_hairpin_trace,
.n_next_nodes = NAT_HAIRPIN_N_NEXT,
.next_nodes = {
[NAT_HAIRPIN_NEXT_DROP] = "error-drop",
@@ -595,7 +650,8 @@ snat_hairpin_dst_fn_inline (vlib_main_t * vm,
udp_header_t *udp0 = ip4_next_header (ip0);
tcp_header_t *tcp0 = (tcp_header_t *) udp0;
- snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, is_ed);
+ snat_hairpinning (vm, node, sm, b0, ip0, udp0, tcp0, proto0,
+ is_ed, 1 /* do_trace */ );
}
else if (proto0 == NAT_PROTOCOL_ICMP)
{
@@ -643,6 +699,7 @@ VLIB_REGISTER_NODE (snat_hairpin_dst_node) = {
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .format_trace = format_nat_hairpin_trace,
.error_strings = nat44_hairpin_error_strings,
.n_next_nodes = NAT_HAIRPIN_N_NEXT,
.next_nodes = {
@@ -665,6 +722,7 @@ VLIB_REGISTER_NODE (nat44_ed_hairpin_dst_node) = {
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .format_trace = format_nat_hairpin_trace,
.error_strings = nat44_hairpin_error_strings,
.n_next_nodes = NAT_HAIRPIN_N_NEXT,
.next_nodes = {