#include <vnet/pg/pg.h>
#include <vnet/gre/gre.h>
#include <vnet/ip/format.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/adj/adj_midchain.h>
+#include <vnet/mpls/mpls.h>
+
+static inline u64
+gre_mk_key (const ip4_address_t *src,
+ const ip4_address_t *dst,
+ u32 out_fib_index)
+{
+ // FIXME. the fib index should be part of the key
+ return ((u64)src->as_u32 << 32 | (u64)dst->as_u32);
+}
-u8 * format_gre_tunnel (u8 * s, va_list * args)
+static u8 *
+format_gre_tunnel (u8 * s, va_list * args)
{
gre_tunnel_t * t = va_arg (*args, gre_tunnel_t *);
+ int detail = va_arg (*args, int);
gre_main_t * gm = &gre_main;
s = format (s,
format_ip4_address, &t->tunnel_dst,
(t->teb ? "teb" : "ip"),
t->outer_fib_index);
+ if (detail)
+ {
+ s = format (s, "\n fib-entry:%d adj-ip4:%d adj-ip6:%d adj-mpls:%d",
+ t->fib_entry_index,
+ t->adj_index[FIB_LINK_IP4],
+ t->adj_index[FIB_LINK_IP6],
+ t->adj_index[FIB_LINK_MPLS]);
+ }
+
return s;
}
-int vnet_gre_add_del_tunnel
- (vnet_gre_add_del_tunnel_args_t *a, u32 * sw_if_indexp)
+static gre_tunnel_t *
+gre_tunnel_db_find (const ip4_address_t *src,
+ const ip4_address_t *dst,
+ u32 out_fib_index)
+{
+ gre_main_t * gm = &gre_main;
+ uword * p;
+ u64 key;
+
+ key = gre_mk_key(src, dst, out_fib_index);
+
+ p = hash_get (gm->tunnel_by_key, key);
+
+ if (NULL == p)
+ return (NULL);
+
+ return (pool_elt_at_index (gm->tunnels, p[0]));
+}
+
+static void
+gre_tunnel_db_add (const gre_tunnel_t *t)
+{
+ gre_main_t * gm = &gre_main;
+ u64 key;
+
+ key = gre_mk_key(&t->tunnel_src, &t->tunnel_dst, t->outer_fib_index);
+ hash_set (gm->tunnel_by_key, key, t - gm->tunnels);
+}
+
+static void
+gre_tunnel_db_remove (const gre_tunnel_t *t)
+{
+ gre_main_t * gm = &gre_main;
+ u64 key;
+
+ key = gre_mk_key(&t->tunnel_src, &t->tunnel_dst, t->outer_fib_index);
+ hash_unset (gm->tunnel_by_key, key);
+}
+
+static gre_tunnel_t *
+gre_tunnel_from_fib_node (fib_node_t *node)
+{
+#if (CLIB_DEBUG > 0)
+ ASSERT(FIB_NODE_TYPE_GRE_TUNNEL == node->fn_type);
+#endif
+ return ((gre_tunnel_t*) (((char*)node) -
+ STRUCT_OFFSET_OF(gre_tunnel_t, node)));
+}
+
+/*
+ * gre_tunnel_stack
+ *
+ * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
+ */
+static void
+gre_tunnel_stack (gre_tunnel_t *gt)
+{
+ fib_link_t linkt;
+
+ /*
+ * find the adjacency that is contributed by the FIB entry
+ * that this tunnel resovles via, and use it as the next adj
+ * in the midchain
+ */
+ FOR_EACH_FIB_LINK(linkt)
+ {
+ if (ADJ_INDEX_INVALID != gt->adj_index[linkt])
+ {
+ adj_nbr_midchain_stack(
+ gt->adj_index[linkt],
+ fib_entry_contribute_ip_forwarding(gt->fib_entry_index));
+ }
+ }
+}
+
+/**
+ * Function definition to backwalk a FIB node
+ */
+static fib_node_back_walk_rc_t
+gre_tunnel_back_walk (fib_node_t *node,
+ fib_node_back_walk_ctx_t *ctx)
+{
+ gre_tunnel_stack(gre_tunnel_from_fib_node(node));
+
+ return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+/**
+ * Function definition to get a FIB node from its index
+ */
+static fib_node_t*
+gre_tunnel_fib_node_get (fib_node_index_t index)
+{
+ gre_tunnel_t * gt;
+ gre_main_t * gm;
+
+ gm = &gre_main;
+ gt = pool_elt_at_index(gm->tunnels, index);
+
+ return (>->node);
+}
+
+/**
+ * Function definition to inform the FIB node that its last lock has gone.
+ */
+static void
+gre_tunnel_last_lock_gone (fib_node_t *node)
+{
+ /*
+ * The MPLS GRE tunnel is a root of the graph. As such
+ * it never has children and thus is never locked.
+ */
+ ASSERT(0);
+}
+
+/*
+ * Virtual function table registered by MPLS GRE tunnels
+ * for participation in the FIB object graph.
+ */
+const static fib_node_vft_t gre_vft = {
+ .fnv_get = gre_tunnel_fib_node_get,
+ .fnv_last_lock = gre_tunnel_last_lock_gone,
+ .fnv_back_walk = gre_tunnel_back_walk,
+};
+
+static int
+gre_proto_from_fib_link (fib_link_t link)
+{
+ switch (link)
+ {
+ case FIB_LINK_IP4:
+ return (GRE_PROTOCOL_ip4);
+ case FIB_LINK_IP6:
+ return (GRE_PROTOCOL_ip6);
+ case FIB_LINK_MPLS:
+ return (GRE_PROTOCOL_mpls_unicast);
+ }
+ ASSERT(0);
+ return (GRE_PROTOCOL_ip4);
+}
+
+static u8 *
+gre_rewrite (gre_tunnel_t * t,
+ fib_link_t link)
+{
+ ip4_and_gre_header_t * h0;
+ u8 * rewrite_data = 0;
+
+ vec_validate_init_empty (rewrite_data, sizeof (*h0) - 1, 0);
+
+ h0 = (ip4_and_gre_header_t *) rewrite_data;
+
+ if (t->teb)
+ {
+ h0->gre.protocol = clib_net_to_host_u16(GRE_PROTOCOL_teb);
+ }
+ else
+ {
+ h0->gre.protocol = clib_host_to_net_u16(gre_proto_from_fib_link(link));
+ }
+
+ h0->ip4.ip_version_and_header_length = 0x45;
+ h0->ip4.ttl = 254;
+ h0->ip4.protocol = IP_PROTOCOL_GRE;
+ /* $$$ fixup ip4 header length and checksum after-the-fact */
+ h0->ip4.src_address.as_u32 = t->tunnel_src.as_u32;
+ h0->ip4.dst_address.as_u32 = t->tunnel_dst.as_u32;
+ h0->ip4.checksum = ip4_header_checksum (&h0->ip4);
+
+ return (rewrite_data);
+}
+
+static int
+vnet_gre_tunnel_add (vnet_gre_add_del_tunnel_args_t *a,
+ u32 * sw_if_indexp)
{
gre_main_t * gm = &gre_main;
vnet_main_t * vnm = gm->vnet_main;
gre_tunnel_t * t;
vnet_hw_interface_t * hi;
u32 hw_if_index, sw_if_index;
- u32 slot;
u32 outer_fib_index;
- uword * p;
- u64 key;
u8 address[6];
clib_error_t *error;
+ fib_link_t linkt;
+ u8 *rewrite;
- key = (u64)a->src.as_u32 << 32 | (u64)a->dst.as_u32;
- p = hash_get (gm->tunnel_by_key, key);
+ outer_fib_index = ip4_fib_index_from_table_id(a->outer_fib_id);
- if (a->is_add) {
- /* check if same src/dst pair exists */
- if (p)
- return VNET_API_ERROR_INVALID_VALUE;
+ if (~0 == outer_fib_index)
+ return VNET_API_ERROR_NO_SUCH_FIB;
- p = hash_get (im->fib_index_by_table_id, a->outer_fib_id);
- if (! p)
- return VNET_API_ERROR_NO_SUCH_FIB;
+ t = gre_tunnel_db_find(&a->src, &a->dst, a->outer_fib_id);
- outer_fib_index = p[0];
+ if (NULL != t)
+ return VNET_API_ERROR_INVALID_VALUE;
- pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
- memset (t, 0, sizeof (*t));
+ pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
+ memset (t, 0, sizeof (*t));
+ fib_node_init(&t->node, FIB_NODE_TYPE_GRE_TUNNEL);
- if (vec_len (gm->free_gre_tunnel_hw_if_indices) > 0) {
- vnet_interface_main_t * im = &vnm->interface_main;
+ if (vec_len (gm->free_gre_tunnel_hw_if_indices) > 0) {
+ vnet_interface_main_t * im = &vnm->interface_main;
- hw_if_index = gm->free_gre_tunnel_hw_if_indices
+ hw_if_index = gm->free_gre_tunnel_hw_if_indices
[vec_len (gm->free_gre_tunnel_hw_if_indices)-1];
- _vec_len (gm->free_gre_tunnel_hw_if_indices) -= 1;
+ _vec_len (gm->free_gre_tunnel_hw_if_indices) -= 1;
- hi = vnet_get_hw_interface (vnm, hw_if_index);
- hi->dev_instance = t - gm->tunnels;
- hi->hw_instance = hi->dev_instance;
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+ hi->dev_instance = t - gm->tunnels;
+ hi->hw_instance = hi->dev_instance;
- /* clear old stats of freed tunnel before reuse */
- sw_if_index = hi->sw_if_index;
- vnet_interface_counter_lock(im);
- vlib_zero_combined_counter
+ /* clear old stats of freed tunnel before reuse */
+ sw_if_index = hi->sw_if_index;
+ vnet_interface_counter_lock(im);
+ vlib_zero_combined_counter
(&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_TX], sw_if_index);
- vlib_zero_combined_counter
+ vlib_zero_combined_counter
(&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], sw_if_index);
- vlib_zero_simple_counter
+ vlib_zero_simple_counter
(&im->sw_if_counters[VNET_INTERFACE_COUNTER_DROP], sw_if_index);
vnet_interface_counter_unlock(im);
} else {
return VNET_API_ERROR_INVALID_REGISTRATION;
}
} else {
- hw_if_index = vnet_register_interface
- (vnm, gre_device_class.index, t - gm->tunnels,
- gre_hw_interface_class.index,
- t - gm->tunnels);
+ hw_if_index = vnet_register_interface
+ (vnm, gre_device_class.index, t - gm->tunnels,
+ gre_hw_interface_class.index,
+ t - gm->tunnels);
}
hi = vnet_get_hw_interface (vnm, hw_if_index);
sw_if_index = hi->sw_if_index;
}
- t->hw_if_index = hw_if_index;
- t->outer_fib_index = outer_fib_index;
- t->sw_if_index = sw_if_index;
+ t->hw_if_index = hw_if_index;
+ t->outer_fib_index = outer_fib_index;
+ t->sw_if_index = sw_if_index;
- vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, sw_if_index, ~0);
- gm->tunnel_index_by_sw_if_index[sw_if_index] = t - gm->tunnels;
+ vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, sw_if_index, ~0);
+ gm->tunnel_index_by_sw_if_index[sw_if_index] = t - gm->tunnels;
- vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
- im->fib_index_by_sw_if_index[sw_if_index] = t->outer_fib_index;
+ vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
+ im->fib_index_by_sw_if_index[sw_if_index] = t->outer_fib_index;
+ ip4_sw_interface_enable_disable(sw_if_index, 1);
- hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t);
- hi->per_packet_overhead_bytes =
+ hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t);
+ hi->per_packet_overhead_bytes =
/* preamble */ 8 + /* inter frame gap */ 12;
- /* Standard default gre MTU. */
- hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 9000;
+ /* Standard default gre MTU. */
+ hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 9000;
+
+ clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src));
+ clib_memcpy (&t->tunnel_dst, &a->dst, sizeof (t->tunnel_dst));
+
+ gre_tunnel_db_add(t);
+
+ /*
+ * source the FIB entry for the tunnel's destination
+ * and become a child thereof. The tunnel will then get poked
+ * when the forwarding for the entry updates, and the tunnel can
+ * re-stack accordingly
+ */
+ const fib_prefix_t tun_dst_pfx = {
+ .fp_len = 32,
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_addr = {
+ .ip4 = t->tunnel_dst,
+ }
+ };
+
+ t->fib_entry_index =
+ fib_table_entry_special_add(outer_fib_index,
+ &tun_dst_pfx,
+ FIB_SOURCE_RR,
+ FIB_ENTRY_FLAG_NONE,
+ ADJ_INDEX_INVALID);
+ t->sibling_index =
+ fib_entry_child_add(t->fib_entry_index,
+ FIB_NODE_TYPE_GRE_TUNNEL,
+ t - gm->tunnels);
+
+ /*
+ * create and update the midchain adj this tunnel sources.
+ * We could be smarter here and trigger this on an interface proto enable,
+ * like we do for MPLS.
+ */
+ for (linkt = FIB_LINK_IP4; linkt <= FIB_LINK_IP6; linkt++)
+ {
+ t->adj_index[linkt] = adj_nbr_add_or_lock(FIB_PROTOCOL_IP4,
+ linkt,
+ &zero_addr,
+ sw_if_index);
+
+ rewrite = gre_rewrite(t, linkt);
+ adj_nbr_midchain_update_rewrite(t->adj_index[linkt],
+ hi->tx_node_index,
+ rewrite);
+ vec_free(rewrite);
+ }
+ t->adj_index[FIB_LINK_MPLS] = ADJ_INDEX_INVALID;
- t->teb = a->teb;
- clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src));
- clib_memcpy (&t->tunnel_dst, &a->dst, sizeof (t->tunnel_dst));
+ t->teb = a->teb;
+ clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src));
+ clib_memcpy (&t->tunnel_dst, &a->dst, sizeof (t->tunnel_dst));
+ gre_tunnel_stack(t);
- hash_set (gm->tunnel_by_key, key, t - gm->tunnels);
+ if (sw_if_indexp)
+ *sw_if_indexp = sw_if_index;
- slot = vlib_node_add_named_next_with_slot
- (vnm->vlib_main, hi->tx_node_index, "ip4-lookup", GRE_OUTPUT_NEXT_LOOKUP);
+ return 0;
+}
- ASSERT (slot == GRE_OUTPUT_NEXT_LOOKUP);
+static int
+vnet_gre_tunnel_delete (vnet_gre_add_del_tunnel_args_t *a,
+ u32 * sw_if_indexp)
+{
+ gre_main_t * gm = &gre_main;
+ vnet_main_t * vnm = gm->vnet_main;
+ gre_tunnel_t * t;
+ fib_link_t linkt;
+ u32 sw_if_index;
+
+ t = gre_tunnel_db_find(&a->src, &a->dst, a->outer_fib_id);
- } else { /* !is_add => delete */
- /* tunnel needs to exist */
- if (! p)
- return VNET_API_ERROR_NO_SUCH_ENTRY;
+ if (NULL == t)
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
- t = pool_elt_at_index (gm->tunnels, p[0]);
+ sw_if_index = t->sw_if_index;
+ vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */);
+ /* make sure tunnel is removed from l2 bd or xconnect */
+ set_int_l2_mode(gm->vlib_main, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0);
+ vec_add1 (gm->free_gre_tunnel_hw_if_indices, t->hw_if_index);
+ gm->tunnel_index_by_sw_if_index[sw_if_index] = ~0;
+ ip4_sw_interface_enable_disable(sw_if_index, 0);
- sw_if_index = t->sw_if_index;
- vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */);
- /* make sure tunnel is removed from l2 bd or xconnect */
- set_int_l2_mode(gm->vlib_main, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0);
- vec_add1 (gm->free_gre_tunnel_hw_if_indices, t->hw_if_index);
- gm->tunnel_index_by_sw_if_index[sw_if_index] = ~0;
+ fib_entry_child_remove(t->fib_entry_index,
+ t->sibling_index);
+ fib_table_entry_delete_index(t->fib_entry_index,
+ FIB_SOURCE_RR);
- hash_unset (gm->tunnel_by_key, key);
- pool_put (gm->tunnels, t);
+ FOR_EACH_FIB_LINK(linkt)
+ {
+ adj_unlock(t->adj_index[linkt]);
}
+ gre_tunnel_db_remove(t);
+ fib_node_deinit(&t->node);
+ pool_put (gm->tunnels, t);
+
if (sw_if_indexp)
*sw_if_indexp = sw_if_index;
return 0;
}
+int
+vnet_gre_add_del_tunnel (vnet_gre_add_del_tunnel_args_t *a,
+ u32 * sw_if_indexp)
+{
+ if (a->is_add)
+ return (vnet_gre_tunnel_add(a, sw_if_indexp));
+ else
+ return (vnet_gre_tunnel_delete(a, sw_if_indexp));
+}
+
+static void
+gre_sw_interface_mpls_state_change (u32 sw_if_index,
+ u32 is_enable)
+{
+ gre_main_t *gm = &gre_main;
+ vnet_hw_interface_t * hi;
+ gre_tunnel_t *t;
+ u8 *rewrite;
+
+ if ((vec_len(gm->tunnel_index_by_sw_if_index) < sw_if_index) ||
+ (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index]))
+ return;
+
+ t = pool_elt_at_index(gm->tunnels,
+ gm->tunnel_index_by_sw_if_index[sw_if_index]);
+
+ if (is_enable)
+ {
+ hi = vnet_get_hw_interface (vnet_get_main(), t->hw_if_index);
+ t->adj_index[FIB_LINK_MPLS] =
+ adj_nbr_add_or_lock(FIB_PROTOCOL_IP4,
+ FIB_LINK_MPLS,
+ &zero_addr,
+ sw_if_index);
+
+ rewrite = gre_rewrite(t, FIB_LINK_MPLS);
+ adj_nbr_midchain_update_rewrite(t->adj_index[FIB_LINK_MPLS],
+ hi->tx_node_index,
+ rewrite);
+ vec_free(rewrite);
+ }
+ else
+ {
+ adj_unlock(t->adj_index[FIB_LINK_MPLS]);
+ t->adj_index[FIB_LINK_MPLS] = ADJ_INDEX_INVALID;
+ }
+
+ gre_tunnel_stack(t);
+}
static clib_error_t *
create_gre_tunnel_command_fn (vlib_main_t * vm,
return clib_error_return (0, "src and dst are identical");
memset (a, 0, sizeof (*a));
- a->is_add = is_add;
a->outer_fib_id = outer_fib_id;
a->teb = teb;
clib_memcpy(&a->src, &src, sizeof(src));
clib_memcpy(&a->dst, &dst, sizeof(dst));
- rv = vnet_gre_add_del_tunnel (a, &sw_if_index);
+ if (is_add)
+ rv = vnet_gre_tunnel_add(a, &sw_if_index);
+ else
+ rv = vnet_gre_tunnel_delete(a, &sw_if_index);
switch(rv)
{
{
gre_main_t * gm = &gre_main;
gre_tunnel_t * t;
+ u32 ti = ~0;
if (pool_elts (gm->tunnels) == 0)
vlib_cli_output (vm, "No GRE tunnels configured...");
- pool_foreach (t, gm->tunnels,
- ({
- vlib_cli_output (vm, "%U", format_gre_tunnel, t);
- }));
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "%d", &ti))
+ ;
+ else
+ break;
+ }
+
+ if (~0 == ti)
+ {
+ pool_foreach (t, gm->tunnels,
+ ({
+ vlib_cli_output (vm, "%U", format_gre_tunnel, t, 0);
+ }));
+ }
+ else
+ {
+ t = pool_elt_at_index(gm->tunnels, ti);
+
+ vlib_cli_output (vm, "%U", format_gre_tunnel, t, 1);
+ }
return 0;
}
/* force inclusion from application's main.c */
clib_error_t *gre_interface_init (vlib_main_t *vm)
{
+ vec_add1(mpls_main.mpls_interface_state_change_callbacks,
+ gre_sw_interface_mpls_state_change);
+
+ fib_node_register_type(FIB_NODE_TYPE_GRE_TUNNEL, &gre_vft);
+
return 0;
}
VLIB_INIT_FUNCTION(gre_interface_init);
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