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-rw-r--r--src/plugins/lb/node.c419
1 files changed, 419 insertions, 0 deletions
diff --git a/src/plugins/lb/node.c b/src/plugins/lb/node.c
new file mode 100644
index 00000000000..8b763c537d5
--- /dev/null
+++ b/src/plugins/lb/node.c
@@ -0,0 +1,419 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <lb/lb.h>
+
+#include <vnet/gre/packet.h>
+#include <lb/lbhash.h>
+
+#define foreach_lb_error \
+ _(NONE, "no error") \
+ _(PROTO_NOT_SUPPORTED, "protocol not supported")
+
+typedef enum {
+#define _(sym,str) LB_ERROR_##sym,
+ foreach_lb_error
+#undef _
+ LB_N_ERROR,
+} lb_error_t;
+
+static char *lb_error_strings[] = {
+#define _(sym,string) string,
+ foreach_lb_error
+#undef _
+};
+
+typedef struct {
+ u32 vip_index;
+ u32 as_index;
+} lb_trace_t;
+
+u8 *
+format_lb_trace (u8 * s, va_list * args)
+{
+ lb_main_t *lbm = &lb_main;
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ lb_trace_t *t = va_arg (*args, lb_trace_t *);
+ if (pool_is_free_index(lbm->vips, t->vip_index)) {
+ s = format(s, "lb vip[%d]: This VIP was freed since capture\n");
+ } else {
+ s = format(s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip, &lbm->vips[t->vip_index]);
+ }
+ if (pool_is_free_index(lbm->ass, t->as_index)) {
+ s = format(s, "lb as[%d]: This AS was freed since capture\n");
+ } else {
+ s = format(s, "lb as[%d]: %U\n", t->as_index, format_lb_as, &lbm->ass[t->as_index]);
+ }
+ return s;
+}
+
+lb_hash_t *lb_get_sticky_table(u32 cpu_index)
+{
+ lb_main_t *lbm = &lb_main;
+ lb_hash_t *sticky_ht = lbm->per_cpu[cpu_index].sticky_ht;
+ //Check if size changed
+ if (PREDICT_FALSE(sticky_ht && (lbm->per_cpu_sticky_buckets != lb_hash_nbuckets(sticky_ht))))
+ {
+ //Dereference everything in there
+ lb_hash_bucket_t *b;
+ u32 i;
+ lb_hash_foreach_entry(sticky_ht, b, i) {
+ vlib_refcount_add(&lbm->as_refcount, cpu_index, b->value[i], -1);
+ vlib_refcount_add(&lbm->as_refcount, cpu_index, 0, 1);
+ }
+
+ lb_hash_free(sticky_ht);
+ sticky_ht = NULL;
+ }
+
+ //Create if necessary
+ if (PREDICT_FALSE(sticky_ht == NULL)) {
+ lbm->per_cpu[cpu_index].sticky_ht = lb_hash_alloc(lbm->per_cpu_sticky_buckets, lbm->flow_timeout);
+ sticky_ht = lbm->per_cpu[cpu_index].sticky_ht;
+ clib_warning("Regenerated sticky table %p", sticky_ht);
+ }
+
+ ASSERT(sticky_ht);
+
+ //Update timeout
+ sticky_ht->timeout = lbm->flow_timeout;
+ return sticky_ht;
+}
+
+u64
+lb_node_get_other_ports4(ip4_header_t *ip40)
+{
+ return 0;
+}
+
+u64
+lb_node_get_other_ports6(ip6_header_t *ip60)
+{
+ return 0;
+}
+
+static_always_inline u32
+lb_node_get_hash(vlib_buffer_t *p, u8 is_input_v4)
+{
+ u32 hash;
+ if (is_input_v4)
+ {
+ ip4_header_t *ip40;
+ u64 ports;
+ ip40 = vlib_buffer_get_current (p);
+ if (PREDICT_TRUE (ip40->protocol == IP_PROTOCOL_TCP ||
+ ip40->protocol == IP_PROTOCOL_UDP))
+ ports = ((u64)((udp_header_t *)(ip40 + 1))->src_port << 16) |
+ ((u64)((udp_header_t *)(ip40 + 1))->dst_port);
+ else
+ ports = lb_node_get_other_ports4(ip40);
+
+ hash = lb_hash_hash(*((u64 *)&ip40->address_pair), ports,
+ 0, 0, 0);
+ }
+ else
+ {
+ ip6_header_t *ip60;
+ ip60 = vlib_buffer_get_current (p);
+ u64 ports;
+ if (PREDICT_TRUE (ip60->protocol == IP_PROTOCOL_TCP ||
+ ip60->protocol == IP_PROTOCOL_UDP))
+ ports = ((u64)((udp_header_t *)(ip60 + 1))->src_port << 16) |
+ ((u64)((udp_header_t *)(ip60 + 1))->dst_port);
+ else
+ ports = lb_node_get_other_ports6(ip60);
+
+ hash = lb_hash_hash(ip60->src_address.as_u64[0],
+ ip60->src_address.as_u64[1],
+ ip60->dst_address.as_u64[0],
+ ip60->dst_address.as_u64[1],
+ ports);
+ }
+ return hash;
+}
+
+static_always_inline uword
+lb_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame,
+ u8 is_input_v4, //Compile-time parameter stating that is input is v4 (or v6)
+ u8 is_encap_v4) //Compile-time parameter stating that is GRE encap is v4 (or v6)
+{
+ lb_main_t *lbm = &lb_main;
+ u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
+ u32 cpu_index = os_get_cpu_number();
+ u32 lb_time = lb_hash_time_now(vm);
+
+ lb_hash_t *sticky_ht = lb_get_sticky_table(cpu_index);
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ u32 nexthash0 = 0;
+ if (PREDICT_TRUE(n_left_from > 0))
+ nexthash0 = lb_node_get_hash(vlib_get_buffer (vm, from[0]), is_input_v4);
+
+ while (n_left_from > 0)
+ {
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 pi0;
+ vlib_buffer_t *p0;
+ lb_vip_t *vip0;
+ u32 asindex0;
+ u16 len0;
+ u32 available_index0;
+ u8 counter = 0;
+ u32 hash0 = nexthash0;
+
+ if (PREDICT_TRUE(n_left_from > 1))
+ {
+ vlib_buffer_t *p1 = vlib_get_buffer (vm, from[1]);
+ //Compute next hash and prefetch bucket
+ nexthash0 = lb_node_get_hash(p1, is_input_v4);
+ lb_hash_prefetch_bucket(sticky_ht, nexthash0);
+ //Prefetch for encap, next
+ CLIB_PREFETCH (vlib_buffer_get_current(p1) - 64, 64, STORE);
+ }
+
+ if (PREDICT_TRUE(n_left_from > 2))
+ {
+ vlib_buffer_t *p2;
+ p2 = vlib_get_buffer(vm, from[2]);
+ /* prefetch packet header and data */
+ vlib_prefetch_buffer_header(p2, STORE);
+ CLIB_PREFETCH (vlib_buffer_get_current(p2), 64, STORE);
+ }
+
+ pi0 = to_next[0] = from[0];
+ from += 1;
+ n_left_from -= 1;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ p0 = vlib_get_buffer (vm, pi0);
+ vip0 = pool_elt_at_index (lbm->vips,
+ vnet_buffer (p0)->ip.adj_index[VLIB_TX]);
+
+ if (is_input_v4)
+ {
+ ip4_header_t *ip40;
+ ip40 = vlib_buffer_get_current (p0);
+ len0 = clib_net_to_host_u16(ip40->length);
+ }
+ else
+ {
+ ip6_header_t *ip60;
+ ip60 = vlib_buffer_get_current (p0);
+ len0 = clib_net_to_host_u16(ip60->payload_length) + sizeof(ip6_header_t);
+ }
+
+ lb_hash_get(sticky_ht, hash0, vnet_buffer (p0)->ip.adj_index[VLIB_TX],
+ lb_time, &available_index0, &asindex0);
+
+ if (PREDICT_TRUE(asindex0 != ~0))
+ {
+ //Found an existing entry
+ counter = LB_VIP_COUNTER_NEXT_PACKET;
+ }
+ else if (PREDICT_TRUE(available_index0 != ~0))
+ {
+ //There is an available slot for a new flow
+ asindex0 = vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index;
+ counter = LB_VIP_COUNTER_FIRST_PACKET;
+ counter = (asindex0 == 0)?LB_VIP_COUNTER_NO_SERVER:counter;
+
+ //TODO: There are race conditions with as0 and vip0 manipulation.
+ //Configuration may be changed, vectors resized, etc...
+
+ //Dereference previously used
+ vlib_refcount_add(&lbm->as_refcount, cpu_index,
+ lb_hash_available_value(sticky_ht, hash0, available_index0), -1);
+ vlib_refcount_add(&lbm->as_refcount, cpu_index,
+ asindex0, 1);
+
+ //Add sticky entry
+ //Note that when there is no AS configured, an entry is configured anyway.
+ //But no configured AS is not something that should happen
+ lb_hash_put(sticky_ht, hash0, asindex0,
+ vnet_buffer (p0)->ip.adj_index[VLIB_TX],
+ available_index0, lb_time);
+ }
+ else
+ {
+ //Could not store new entry in the table
+ asindex0 = vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index;
+ counter = LB_VIP_COUNTER_UNTRACKED_PACKET;
+ }
+
+ vlib_increment_simple_counter(&lbm->vip_counters[counter],
+ cpu_index,
+ vnet_buffer (p0)->ip.adj_index[VLIB_TX],
+ 1);
+
+ //Now let's encap
+ {
+ gre_header_t *gre0;
+ if (is_encap_v4)
+ {
+ ip4_header_t *ip40;
+ vlib_buffer_advance(p0, - sizeof(ip4_header_t) - sizeof(gre_header_t));
+ ip40 = vlib_buffer_get_current(p0);
+ gre0 = (gre_header_t *)(ip40 + 1);
+ ip40->src_address = lbm->ip4_src_address;
+ ip40->dst_address = lbm->ass[asindex0].address.ip4;
+ ip40->ip_version_and_header_length = 0x45;
+ ip40->ttl = 128;
+ ip40->length = clib_host_to_net_u16(len0 + sizeof(gre_header_t) + sizeof(ip4_header_t));
+ ip40->protocol = IP_PROTOCOL_GRE;
+ ip40->checksum = ip4_header_checksum (ip40);
+ }
+ else
+ {
+ ip6_header_t *ip60;
+ vlib_buffer_advance(p0, - sizeof(ip6_header_t) - sizeof(gre_header_t));
+ ip60 = vlib_buffer_get_current(p0);
+ gre0 = (gre_header_t *)(ip60 + 1);
+ ip60->dst_address = lbm->ass[asindex0].address.ip6;
+ ip60->src_address = lbm->ip6_src_address;
+ ip60->hop_limit = 128;
+ ip60->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6<<28);
+ ip60->payload_length = clib_host_to_net_u16(len0 + sizeof(gre_header_t));
+ ip60->protocol = IP_PROTOCOL_GRE;
+ }
+
+ gre0->flags_and_version = 0;
+ gre0->protocol = (is_input_v4)?
+ clib_host_to_net_u16(0x0800):
+ clib_host_to_net_u16(0x86DD);
+ }
+
+ if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lb_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
+ tr->as_index = asindex0;
+ tr->vip_index = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+ }
+
+ //Enqueue to next
+ //Note that this is going to error if asindex0 == 0
+ vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbm->ass[asindex0].dpo.dpoi_index;
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+ n_left_to_next, pi0,
+ lbm->ass[asindex0].dpo.dpoi_next_node);
+ }
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+static uword
+lb6_gre6_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return lb_node_fn(vm, node, frame, 0, 0);
+}
+
+static uword
+lb6_gre4_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return lb_node_fn(vm, node, frame, 0, 1);
+}
+
+static uword
+lb4_gre6_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return lb_node_fn(vm, node, frame, 1, 0);
+}
+
+static uword
+lb4_gre4_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return lb_node_fn(vm, node, frame, 1, 1);
+}
+
+VLIB_REGISTER_NODE (lb6_gre6_node) =
+{
+ .function = lb6_gre6_node_fn,
+ .name = "lb6-gre6",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lb_trace,
+
+ .n_errors = LB_N_ERROR,
+ .error_strings = lb_error_strings,
+
+ .n_next_nodes = LB_N_NEXT,
+ .next_nodes =
+ {
+ [LB_NEXT_DROP] = "error-drop"
+ },
+};
+
+VLIB_REGISTER_NODE (lb6_gre4_node) =
+{
+ .function = lb6_gre4_node_fn,
+ .name = "lb6-gre4",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lb_trace,
+
+ .n_errors = LB_N_ERROR,
+ .error_strings = lb_error_strings,
+
+ .n_next_nodes = LB_N_NEXT,
+ .next_nodes =
+ {
+ [LB_NEXT_DROP] = "error-drop"
+ },
+};
+
+VLIB_REGISTER_NODE (lb4_gre6_node) =
+{
+ .function = lb4_gre6_node_fn,
+ .name = "lb4-gre6",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lb_trace,
+
+ .n_errors = LB_N_ERROR,
+ .error_strings = lb_error_strings,
+
+ .n_next_nodes = LB_N_NEXT,
+ .next_nodes =
+ {
+ [LB_NEXT_DROP] = "error-drop"
+ },
+};
+
+VLIB_REGISTER_NODE (lb4_gre4_node) =
+{
+ .function = lb4_gre4_node_fn,
+ .name = "lb4-gre4",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lb_trace,
+
+ .n_errors = LB_N_ERROR,
+ .error_strings = lb_error_strings,
+
+ .n_next_nodes = LB_N_NEXT,
+ .next_nodes =
+ {
+ [LB_NEXT_DROP] = "error-drop"
+ },
+};
+