#ifndef __included_nat_inlines_h__
#define __included_nat_inlines_h__
+#include <vnet/fib/ip4_fib.h>
#include <nat/nat.h>
always_inline u32
to_next += 1;
n_left_to_next -= 1;
vlib_buffer_t *p0 = vlib_get_buffer (vm, bi0);
- p0->error = *error;
+ if (error)
+ p0->error = *error;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next);
}
kv->value = ~0ULL;
}
+always_inline void
+mss_clamping (snat_main_t * sm, tcp_header_t * tcp, ip_csum_t * sum)
+{
+ u8 *data;
+ u8 opt_len, opts_len, kind;
+ u16 mss;
+
+ if (!(sm->mss_clamping && tcp_syn (tcp)))
+ return;
+
+ opts_len = (tcp_doff (tcp) << 2) - sizeof (tcp_header_t);
+ data = (u8 *) (tcp + 1);
+ for (; opts_len > 0; opts_len -= opt_len, data += opt_len)
+ {
+ kind = data[0];
+
+ if (kind == TCP_OPTION_EOL)
+ break;
+ else if (kind == TCP_OPTION_NOOP)
+ {
+ opt_len = 1;
+ continue;
+ }
+ else
+ {
+ if (opts_len < 2)
+ return;
+ opt_len = data[1];
+
+ if (opt_len < 2 || opt_len > opts_len)
+ return;
+ }
+
+ if (kind == TCP_OPTION_MSS)
+ {
+ mss = *(u16 *) (data + 2);
+ if (clib_net_to_host_u16 (mss) > sm->mss_clamping)
+ {
+ *sum =
+ ip_csum_update (*sum, mss, sm->mss_value_net, ip4_header_t,
+ length);
+ clib_memcpy_fast (data + 2, &sm->mss_value_net, 2);
+ }
+ return;
+ }
+ }
+}
+
+/**
+ * @brief Check if packet should be translated
+ *
+ * Packets aimed at outside interface and external address with active session
+ * should be translated.
+ *
+ * @param sm NAT main
+ * @param rt NAT runtime data
+ * @param sw_if_index0 index of the inside interface
+ * @param ip0 IPv4 header
+ * @param proto0 NAT protocol
+ * @param rx_fib_index0 RX FIB index
+ *
+ * @returns 0 if packet should be translated otherwise 1
+ */
+static inline int
+snat_not_translate_fast (snat_main_t * sm, vlib_node_runtime_t * node,
+ u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
+ u32 rx_fib_index0)
+{
+ if (sm->out2in_dpo)
+ return 0;
+
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ nat_outside_fib_t *outside_fib;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {
+ .ip4.as_u32 = ip0->dst_address.as_u32,
+ }
+ ,
+ };
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
+ ip0->dst_address.as_u32)))
+ return 1;
+
+ fei = fib_table_lookup (rx_fib_index0, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ u32 sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index == ~0)
+ {
+ vec_foreach (outside_fib, sm->outside_fibs)
+ {
+ fei = fib_table_lookup (outside_fib->fib_index, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index != ~0)
+ break;
+ }
+ }
+ }
+ if (sw_if_index == ~0)
+ return 1;
+
+ snat_interface_t *i;
+ pool_foreach (i, sm->interfaces, (
+ {
+ /* NAT packet aimed at outside interface */
+ if ((nat_interface_is_outside (i))
+ && (sw_if_index ==
+ i->sw_if_index)) return 0;}
+ ));
+ }
+
+ return 1;
+}
+
#endif /* __included_nat_inlines_h__ */
/*