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-rw-r--r--src/vnet/sr/sr.c3333
1 files changed, 3333 insertions, 0 deletions
diff --git a/src/vnet/sr/sr.c b/src/vnet/sr/sr.c
new file mode 100644
index 00000000000..5d0275d992a
--- /dev/null
+++ b/src/vnet/sr/sr.c
@@ -0,0 +1,3333 @@
+/*
+ * sr.c: ipv6 segment routing
+ *
+ * Copyright (c) 2013 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.
+ */
+
+/**
+ * @file
+ * @brief Segment Routing main functions
+ *
+ */
+#include <vnet/vnet.h>
+#include <vnet/sr/sr.h>
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/dpo/dpo.h>
+
+#include <openssl/hmac.h>
+
+ip6_sr_main_t sr_main;
+static vlib_node_registration_t sr_local_node;
+
+/**
+ * @brief Dynamically added SR DPO type
+ */
+static dpo_type_t sr_dpo_type;
+
+/**
+ * @brief Use passed HMAC key in ip6_sr_header_t in OpenSSL HMAC routines
+ *
+ * @param sm ip6_sr_main_t *
+ * @param ip ip6_header_t *
+ * @param sr ip6_sr_header_t *
+ */
+void
+sr_fix_hmac (ip6_sr_main_t * sm, ip6_header_t * ip, ip6_sr_header_t * sr)
+{
+ u32 key_index;
+ static u8 *keybuf;
+ u8 *copy_target;
+ int first_segment;
+ ip6_address_t *addrp;
+ int i;
+ ip6_sr_hmac_key_t *hmac_key;
+ u32 sig_len;
+
+ key_index = sr->hmac_key;
+
+ /* No signature? Pass... */
+ if (key_index == 0)
+ return;
+
+ /* We don't know about this key? Fail... */
+ if (key_index >= vec_len (sm->hmac_keys))
+ return;
+
+ hmac_key = sm->hmac_keys + key_index;
+
+ vec_reset_length (keybuf);
+
+ /* pkt ip6 src address */
+ vec_add2 (keybuf, copy_target, sizeof (ip6_address_t));
+ clib_memcpy (copy_target, ip->src_address.as_u8, sizeof (ip6_address_t));
+
+ /* first segment */
+ vec_add2 (keybuf, copy_target, 1);
+ copy_target[0] = sr->first_segment;
+
+ /* octet w/ bit 0 = "clean" flag */
+ vec_add2 (keybuf, copy_target, 1);
+ copy_target[0]
+ = (sr->flags & clib_host_to_net_u16 (IP6_SR_HEADER_FLAG_CLEANUP))
+ ? 0x80 : 0;
+
+ /* hmac key id */
+ vec_add2 (keybuf, copy_target, 1);
+ copy_target[0] = sr->hmac_key;
+
+ first_segment = sr->first_segment;
+
+ addrp = sr->segments;
+
+ /* segments */
+ for (i = 0; i <= first_segment; i++)
+ {
+ vec_add2 (keybuf, copy_target, sizeof (ip6_address_t));
+ clib_memcpy (copy_target, addrp->as_u8, sizeof (ip6_address_t));
+ addrp++;
+ }
+
+ addrp++;
+
+ HMAC_CTX_init (sm->hmac_ctx);
+ if (!HMAC_Init (sm->hmac_ctx, hmac_key->shared_secret,
+ vec_len (hmac_key->shared_secret), sm->md))
+ clib_warning ("barf1");
+ if (!HMAC_Update (sm->hmac_ctx, keybuf, vec_len (keybuf)))
+ clib_warning ("barf2");
+ if (!HMAC_Final (sm->hmac_ctx, (unsigned char *) addrp, &sig_len))
+ clib_warning ("barf3");
+ HMAC_CTX_cleanup (sm->hmac_ctx);
+}
+
+/**
+ * @brief Format function for decoding various SR flags
+ *
+ * @param s u8 * - formatted string
+ * @param args va_list * - u16 flags
+ *
+ * @return formatted output string u8 *
+ */
+u8 *
+format_ip6_sr_header_flags (u8 * s, va_list * args)
+{
+ u16 flags = (u16) va_arg (*args, int);
+ u8 pl_flag;
+ int bswap_needed = va_arg (*args, int);
+ int i;
+
+ if (bswap_needed)
+ flags = clib_host_to_net_u16 (flags);
+
+ if (flags & IP6_SR_HEADER_FLAG_CLEANUP)
+ s = format (s, "cleanup ");
+
+ if (flags & IP6_SR_HEADER_FLAG_PROTECTED)
+ s = format (s, "reroute ");
+
+ s = format (s, "pl: ");
+ for (i = 1; i <= 4; i++)
+ {
+ pl_flag = ip6_sr_policy_list_flags (flags, i);
+ s = format (s, "[%d] ", i);
+
+ switch (pl_flag)
+ {
+ case IP6_SR_HEADER_FLAG_PL_ELT_NOT_PRESENT:
+ s = format (s, "NotPr ");
+ break;
+ case IP6_SR_HEADER_FLAG_PL_ELT_INGRESS_PE:
+ s = format (s, "InPE ");
+ break;
+ case IP6_SR_HEADER_FLAG_PL_ELT_EGRESS_PE:
+ s = format (s, "EgPE ");
+ break;
+
+ case IP6_SR_HEADER_FLAG_PL_ELT_ORIG_SRC_ADDR:
+ s = format (s, "OrgSrc ");
+ break;
+ }
+ }
+ return s;
+}
+
+/**
+ * @brief Format function for decoding ip6_sr_header_t
+ *
+ * @param s u8 * - formatted string
+ * @param args va_list * - ip6_sr_header_t
+ *
+ * @return formatted output string u8 *
+ */
+u8 *
+format_ip6_sr_header (u8 * s, va_list * args)
+{
+ ip6_sr_header_t *h = va_arg (*args, ip6_sr_header_t *);
+ ip6_address_t placeholder_addr =
+ { {254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254,
+ 254, 254}
+ };
+ int print_hmac = va_arg (*args, int);
+ int i, pl_index, max_segs;
+ int flags_host_byte_order = clib_net_to_host_u16 (h->flags);
+
+ s = format (s, "next proto %d, len %d, type %d",
+ h->protocol, (h->length << 3) + 8, h->type);
+ s = format (s, "\n segs left %d, first_segment %d, hmac key %d",
+ h->segments_left, h->first_segment, h->hmac_key);
+ s = format (s, "\n flags %U", format_ip6_sr_header_flags,
+ flags_host_byte_order, 0 /* bswap needed */ );
+
+ /*
+ * Header length is in 8-byte units (minus one), so
+ * divide by 2 to ascertain the number of ip6 addresses in the
+ * segment list
+ */
+ max_segs = (h->length >> 1);
+
+ if (!print_hmac && h->hmac_key)
+ max_segs -= 2;
+
+ s = format (s, "\n Segments (in processing order):");
+
+ for (i = h->first_segment; i >= 1; i--)
+ s = format (s, "\n %U", format_ip6_address, h->segments + i);
+ if (ip6_address_is_equal (&placeholder_addr, h->segments))
+ s = format (s, "\n (empty placeholder)");
+ else
+ s = format (s, "\n %U", format_ip6_address, h->segments);
+
+ s = format (s, "\n Policy List:");
+
+ pl_index = 1; /* to match the RFC text */
+ for (i = (h->first_segment + 1); i < max_segs; i++, pl_index++)
+ {
+ char *tag;
+ char *tags[] = { " ", "InPE: ", "EgPE: ", "OrgSrc: " };
+
+ tag = tags[0];
+ if (pl_index >= 1 && pl_index <= 4)
+ {
+ int this_pl_flag = ip6_sr_policy_list_flags
+ (flags_host_byte_order, pl_index);
+ tag = tags[this_pl_flag];
+ }
+
+ s = format (s, "\n %s%U", tag, format_ip6_address, h->segments + i);
+ }
+
+ return s;
+}
+
+/**
+ * @brief Format function for decoding ip6_sr_header_t with length
+ *
+ * @param s u8 * - formatted string
+ * @param args va_list * - ip6_header_t + ip6_sr_header_t
+ *
+ * @return formatted output string u8 *
+ */
+u8 *
+format_ip6_sr_header_with_length (u8 * s, va_list * args)
+{
+ ip6_header_t *h = va_arg (*args, ip6_header_t *);
+ u32 max_header_bytes = va_arg (*args, u32);
+ uword header_bytes;
+
+ header_bytes = sizeof (h[0]) + sizeof (ip6_sr_header_t);
+ if (max_header_bytes != 0 && header_bytes > max_header_bytes)
+ return format (s, "ip6_sr header truncated");
+
+ s = format (s, "IP6: %U\n", format_ip6_header, h, max_header_bytes);
+ s =
+ format (s, "SR: %U\n", format_ip6_sr_header, (ip6_sr_header_t *) (h + 1),
+ 0 /* print_hmac */ , max_header_bytes);
+ return s;
+}
+
+/**
+ * @brief Defined valid next nodes
+ * @note Cannot call replicate yet without DPDK
+*/
+#if DPDK > 0
+#define foreach_sr_rewrite_next \
+_(ERROR, "error-drop") \
+_(IP6_LOOKUP, "ip6-lookup") \
+_(SR_LOCAL, "sr-local") \
+_(SR_REPLICATE,"sr-replicate")
+#else
+#define foreach_sr_rewrite_next \
+_(ERROR, "error-drop") \
+_(IP6_LOOKUP, "ip6-lookup") \
+_(SR_LOCAL, "sr-local")
+#endif /* DPDK */
+
+/**
+ * @brief Struct for defined valid next nodes
+*/
+typedef enum
+{
+#define _(s,n) SR_REWRITE_NEXT_##s,
+ foreach_sr_rewrite_next
+#undef _
+ SR_REWRITE_N_NEXT,
+} sr_rewrite_next_t;
+
+/**
+ * @brief Struct for data for SR rewrite packet trace
+ */
+typedef struct
+{
+ ip6_address_t src, dst;
+ u16 length;
+ u32 next_index;
+ u32 tunnel_index;
+ u8 sr[256];
+} sr_rewrite_trace_t;
+
+/**
+ * @brief Error strings for SR rewrite
+ */
+static char *sr_rewrite_error_strings[] = {
+#define sr_error(n,s) s,
+#include "sr_error.def"
+#undef sr_error
+};
+
+/**
+ * @brief Struct for SR rewrite error strings
+ */
+typedef enum
+{
+#define sr_error(n,s) SR_REWRITE_ERROR_##n,
+#include "sr_error.def"
+#undef sr_error
+ SR_REWRITE_N_ERROR,
+} sr_rewrite_error_t;
+
+
+/**
+ * @brief Format function for SR rewrite trace.
+ */
+u8 *
+format_sr_rewrite_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 *);
+ sr_rewrite_trace_t *t = va_arg (*args, sr_rewrite_trace_t *);
+ ip6_sr_main_t *sm = &sr_main;
+ ip6_sr_tunnel_t *tun = pool_elt_at_index (sm->tunnels, t->tunnel_index);
+ ip6_fib_t *rx_fib, *tx_fib;
+
+ rx_fib = ip6_fib_get (tun->rx_fib_index);
+ tx_fib = ip6_fib_get (tun->tx_fib_index);
+
+ s = format
+ (s, "SR-REWRITE: next %s ip6 src %U dst %U len %u\n"
+ " rx-fib-id %d tx-fib-id %d\n%U",
+ (t->next_index == SR_REWRITE_NEXT_SR_LOCAL)
+ ? "sr-local" : "ip6-lookup",
+ format_ip6_address, &t->src,
+ format_ip6_address, &t->dst, t->length,
+ rx_fib->table_id, tx_fib->table_id,
+ format_ip6_sr_header, t->sr, 0 /* print_hmac */ );
+ return s;
+}
+
+/**
+ * @brief Main processing dual-loop for Segment Routing Rewrite
+ * @node sr-rewrite
+ *
+ * @param vm vlib_main_t *
+ * @param node vlib_node_runtime_t *
+ * @param from_frame vlib_frame_t *
+ *
+ * @return from_frame->n_vectors uword
+ */
+static uword
+sr_rewrite (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+ ip6_sr_main_t *sm = &sr_main;
+ u32 (*sr_local_cb) (vlib_main_t *, vlib_node_runtime_t *,
+ vlib_buffer_t *, ip6_header_t *, ip6_sr_header_t *);
+ sr_local_cb = sm->sr_local_cb;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ /* Note 2x loop disabled */
+ while (0 && n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+ ip6_header_t *ip0, *ip1;
+ ip6_sr_header_t *sr0, *sr1;
+ ip6_sr_tunnel_t *t0, *t1;
+ u32 next0 = SR_REWRITE_NEXT_IP6_LOOKUP;
+ u32 next1 = SR_REWRITE_NEXT_IP6_LOOKUP;
+ u16 new_l0 = 0;
+ u16 new_l1 = 0;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+ }
+
+ bi0 = from[0];
+ bi1 = from[1];
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ /*
+ * $$$ parse through header(s) to pick the point
+ * where we punch in the SR extention header
+ */
+ t0 =
+ pool_elt_at_index (sm->tunnels,
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
+ t1 =
+ pool_elt_at_index (sm->tunnels,
+ vnet_buffer (b1)->ip.adj_index[VLIB_TX]);
+
+ ASSERT (VLIB_BUFFER_PRE_DATA_SIZE
+ >= ((word) vec_len (t0->rewrite)) + b0->current_data);
+ ASSERT (VLIB_BUFFER_PRE_DATA_SIZE
+ >= ((word) vec_len (t1->rewrite)) + b1->current_data);
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = t0->tx_fib_index;
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = t1->tx_fib_index;
+
+ ip0 = vlib_buffer_get_current (b0);
+ ip1 = vlib_buffer_get_current (b1);
+#if DPDK > 0 /* Cannot call replication node yet without DPDK */
+ /* add a replication node */
+ if (PREDICT_FALSE (t0->policy_index != ~0))
+ {
+ vnet_buffer (b0)->ip.save_protocol = t0->policy_index;
+ next0 = SR_REWRITE_NEXT_SR_REPLICATE;
+ sr0 = (ip6_sr_header_t *) (t0->rewrite);
+ goto processnext;
+ }
+#endif /* DPDK */
+
+ /*
+ * SR-unaware service chaining case: pkt coming back from
+ * service has the original dst address, and will already
+ * have an SR header. If so, send it to sr-local
+ */
+ if (PREDICT_FALSE (ip0->protocol == IPPROTO_IPV6_ROUTE))
+ {
+ vlib_buffer_advance (b0, sizeof (ip0));
+ sr0 = (ip6_sr_header_t *) (ip0 + 1);
+ new_l0 = clib_net_to_host_u16 (ip0->payload_length);
+ next0 = SR_REWRITE_NEXT_SR_LOCAL;
+ }
+ else
+ {
+ u32 len_bytes = sizeof (ip6_header_t);
+ u8 next_hdr = ip0->protocol;
+
+ /* HBH must immediately follow ipv6 header */
+ if (PREDICT_FALSE
+ (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
+ len_bytes +=
+ ip6_ext_header_len ((ip6_ext_header_t *) ext_hdr);
+ /* Ignoring the sr_local for now, if RH follows HBH here */
+ next_hdr = ext_hdr->next_hdr;
+ ext_hdr->next_hdr = IPPROTO_IPV6_ROUTE;
+ }
+ else
+ {
+ ip0->protocol = IPPROTO_IPV6_ROUTE; /* routing extension header */
+ }
+ /*
+ * Copy data before the punch-in point left by the
+ * required amount. Assume (for the moment) that only
+ * the main packet header needs to be copied.
+ */
+ clib_memcpy (((u8 *) ip0) - vec_len (t0->rewrite),
+ ip0, len_bytes);
+ vlib_buffer_advance (b0, -(word) vec_len (t0->rewrite));
+ ip0 = vlib_buffer_get_current (b0);
+ sr0 = (ip6_sr_header_t *) ((u8 *) ip0 + len_bytes);
+ /* $$$ tune */
+ clib_memcpy (sr0, t0->rewrite, vec_len (t0->rewrite));
+
+ /* Fix the next header chain */
+ sr0->protocol = next_hdr;
+
+ new_l0 = clib_net_to_host_u16 (ip0->payload_length) +
+ vec_len (t0->rewrite);
+ ip0->payload_length = clib_host_to_net_u16 (new_l0);
+
+ /* Copy dst address into the DA slot in the segment list */
+ clib_memcpy (sr0->segments, ip0->dst_address.as_u64,
+ sizeof (ip6_address_t));
+ /* Rewrite the ip6 dst address with the first hop */
+ clib_memcpy (ip0->dst_address.as_u64, t0->first_hop.as_u64,
+ sizeof (ip6_address_t));
+
+ sr_fix_hmac (sm, ip0, sr0);
+
+ next0 = sr_local_cb ? sr_local_cb (vm, node, b0, ip0, sr0) :
+ next0;
+
+ /*
+ * Ignore "do not rewrite" shtik in this path
+ */
+ if (PREDICT_FALSE (next0 & 0x80000000))
+ {
+ next0 ^= 0xFFFFFFFF;
+ if (PREDICT_FALSE (next0 == SR_REWRITE_NEXT_ERROR))
+ b0->error = node->errors[SR_REWRITE_ERROR_APP_CALLBACK];
+ }
+ }
+#if DPDK > 0 /* Cannot call replication node yet without DPDK */
+ processnext:
+ /* add a replication node */
+ if (PREDICT_FALSE (t1->policy_index != ~0))
+ {
+ vnet_buffer (b1)->ip.save_protocol = t1->policy_index;
+ next1 = SR_REWRITE_NEXT_SR_REPLICATE;
+ sr1 = (ip6_sr_header_t *) (t1->rewrite);
+ goto trace00;
+ }
+#endif /* DPDK */
+ if (PREDICT_FALSE (ip1->protocol == IPPROTO_IPV6_ROUTE))
+ {
+ vlib_buffer_advance (b1, sizeof (ip1));
+ sr1 = (ip6_sr_header_t *) (ip1 + 1);
+ new_l1 = clib_net_to_host_u16 (ip1->payload_length);
+ next1 = SR_REWRITE_NEXT_SR_LOCAL;
+ }
+ else
+ {
+ u32 len_bytes = sizeof (ip6_header_t);
+ u8 next_hdr = ip1->protocol;
+
+ /* HBH must immediately follow ipv6 header */
+ if (PREDICT_FALSE
+ (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip1);
+ len_bytes +=
+ ip6_ext_header_len ((ip6_ext_header_t *) ext_hdr);
+ /* Ignoring the sr_local for now, if RH follows HBH here */
+ next_hdr = ext_hdr->next_hdr;
+ ext_hdr->next_hdr = IPPROTO_IPV6_ROUTE;
+ }
+ else
+ {
+ ip1->protocol = IPPROTO_IPV6_ROUTE;
+ }
+ /*
+ * Copy data before the punch-in point left by the
+ * required amount. Assume (for the moment) that only
+ * the main packet header needs to be copied.
+ */
+ clib_memcpy (((u8 *) ip1) - vec_len (t1->rewrite),
+ ip1, len_bytes);
+ vlib_buffer_advance (b1, -(word) vec_len (t1->rewrite));
+ ip1 = vlib_buffer_get_current (b1);
+ sr1 = (ip6_sr_header_t *) ((u8 *) ip1 + len_bytes);
+ clib_memcpy (sr1, t1->rewrite, vec_len (t1->rewrite));
+
+ sr1->protocol = next_hdr;
+ new_l1 = clib_net_to_host_u16 (ip1->payload_length) +
+ vec_len (t1->rewrite);
+ ip1->payload_length = clib_host_to_net_u16 (new_l1);
+
+ /* Copy dst address into the DA slot in the segment list */
+ clib_memcpy (sr1->segments, ip1->dst_address.as_u64,
+ sizeof (ip6_address_t));
+ /* Rewrite the ip6 dst address with the first hop */
+ clib_memcpy (ip1->dst_address.as_u64, t1->first_hop.as_u64,
+ sizeof (ip6_address_t));
+
+ sr_fix_hmac (sm, ip1, sr1);
+
+ next1 = sr_local_cb ? sr_local_cb (vm, node, b1, ip1, sr1) :
+ next1;
+
+ /*
+ * Ignore "do not rewrite" shtik in this path
+ */
+ if (PREDICT_FALSE (next1 & 0x80000000))
+ {
+ next1 ^= 0xFFFFFFFF;
+ if (PREDICT_FALSE (next1 == SR_REWRITE_NEXT_ERROR))
+ b1->error = node->errors[SR_REWRITE_ERROR_APP_CALLBACK];
+ }
+ }
+#if DPDK > 0 /* Cannot run replicate without DPDK and only replicate uses this label */
+ trace00:
+#endif /* DPDK */
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_rewrite_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_index = t0 - sm->tunnels;
+ clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
+ sizeof (tr->src.as_u8));
+ clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
+ sizeof (tr->dst.as_u8));
+ tr->length = new_l0;
+ tr->next_index = next0;
+ if (sr0)
+ clib_memcpy (tr->sr, sr0, sizeof (tr->sr));
+ }
+ if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_rewrite_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->tunnel_index = t1 - sm->tunnels;
+ clib_memcpy (tr->src.as_u8, ip1->src_address.as_u8,
+ sizeof (tr->src.as_u8));
+ clib_memcpy (tr->dst.as_u8, ip1->dst_address.as_u8,
+ sizeof (tr->dst.as_u8));
+ tr->length = new_l1;
+ tr->next_index = next1;
+ if (sr1)
+ clib_memcpy (tr->sr, sr1, sizeof (tr->sr));
+ }
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ ip6_header_t *ip0 = 0;
+ ip6_sr_header_t *sr0 = 0;
+ ip6_sr_tunnel_t *t0;
+ u32 next0 = SR_REWRITE_NEXT_IP6_LOOKUP;
+ u16 new_l0 = 0;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+
+ /*
+ * $$$ parse through header(s) to pick the point
+ * where we punch in the SR extention header
+ */
+ t0 =
+ pool_elt_at_index (sm->tunnels,
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
+#if DPDK > 0 /* Cannot call replication node yet without DPDK */
+ /* add a replication node */
+ if (PREDICT_FALSE (t0->policy_index != ~0))
+ {
+ vnet_buffer (b0)->ip.save_protocol = t0->policy_index;
+ next0 = SR_REWRITE_NEXT_SR_REPLICATE;
+ sr0 = (ip6_sr_header_t *) (t0->rewrite);
+ goto trace0;
+ }
+#endif /* DPDK */
+
+ ASSERT (VLIB_BUFFER_PRE_DATA_SIZE
+ >= ((word) vec_len (t0->rewrite)) + b0->current_data);
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = t0->tx_fib_index;
+
+ ip0 = vlib_buffer_get_current (b0);
+
+ /*
+ * SR-unaware service chaining case: pkt coming back from
+ * service has the original dst address, and will already
+ * have an SR header. If so, send it to sr-local
+ */
+ if (PREDICT_FALSE (ip0->protocol == IPPROTO_IPV6_ROUTE))
+ {
+ vlib_buffer_advance (b0, sizeof (ip0));
+ sr0 = (ip6_sr_header_t *) (ip0 + 1);
+ new_l0 = clib_net_to_host_u16 (ip0->payload_length);
+ next0 = SR_REWRITE_NEXT_SR_LOCAL;
+ }
+ else
+ {
+ u32 len_bytes = sizeof (ip6_header_t);
+ u8 next_hdr = ip0->protocol;
+
+ /* HBH must immediately follow ipv6 header */
+ if (PREDICT_FALSE
+ (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
+ len_bytes +=
+ ip6_ext_header_len ((ip6_ext_header_t *) ext_hdr);
+ next_hdr = ext_hdr->next_hdr;
+ ext_hdr->next_hdr = IPPROTO_IPV6_ROUTE;
+ /* Ignoring the sr_local for now, if RH follows HBH here */
+ }
+ else
+ {
+ ip0->protocol = IPPROTO_IPV6_ROUTE; /* routing extension header */
+ }
+ /*
+ * Copy data before the punch-in point left by the
+ * required amount. Assume (for the moment) that only
+ * the main packet header needs to be copied.
+ */
+ clib_memcpy (((u8 *) ip0) - vec_len (t0->rewrite),
+ ip0, len_bytes);
+ vlib_buffer_advance (b0, -(word) vec_len (t0->rewrite));
+ ip0 = vlib_buffer_get_current (b0);
+ sr0 = (ip6_sr_header_t *) ((u8 *) ip0 + len_bytes);
+ /* $$$ tune */
+ clib_memcpy (sr0, t0->rewrite, vec_len (t0->rewrite));
+
+ /* Fix the next header chain */
+ sr0->protocol = next_hdr;
+ new_l0 = clib_net_to_host_u16 (ip0->payload_length) +
+ vec_len (t0->rewrite);
+ ip0->payload_length = clib_host_to_net_u16 (new_l0);
+
+ /* Copy dst address into the DA slot in the segment list */
+ clib_memcpy (sr0->segments, ip0->dst_address.as_u64,
+ sizeof (ip6_address_t));
+ /* Rewrite the ip6 dst address with the first hop */
+ clib_memcpy (ip0->dst_address.as_u64, t0->first_hop.as_u64,
+ sizeof (ip6_address_t));
+
+ sr_fix_hmac (sm, ip0, sr0);
+
+ next0 = sr_local_cb ? sr_local_cb (vm, node, b0, ip0, sr0) :
+ next0;
+
+ /*
+ * Ignore "do not rewrite" shtik in this path
+ */
+ if (PREDICT_FALSE (next0 & 0x80000000))
+ {
+ next0 ^= 0xFFFFFFFF;
+ if (PREDICT_FALSE (next0 == SR_REWRITE_NEXT_ERROR))
+ b0->error = node->errors[SR_REWRITE_ERROR_APP_CALLBACK];
+ }
+ }
+#if DPDK > 0 /* Cannot run replicate without DPDK and only replicate uses this label */
+ trace0:
+#endif /* DPDK */
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_rewrite_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_index = t0 - sm->tunnels;
+ if (ip0)
+ {
+ memcpy (tr->src.as_u8, ip0->src_address.as_u8,
+ sizeof (tr->src.as_u8));
+ memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
+ sizeof (tr->dst.as_u8));
+ }
+ tr->length = new_l0;
+ tr->next_index = next0;
+ if (sr0)
+ clib_memcpy (tr->sr, sr0, sizeof (tr->sr));
+ }
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ return from_frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (sr_rewrite_node) = {
+ .function = sr_rewrite,
+ .name = "sr-rewrite",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .format_trace = format_sr_rewrite_trace,
+ .format_buffer = format_ip6_sr_header_with_length,
+
+ .n_errors = SR_REWRITE_N_ERROR,
+ .error_strings = sr_rewrite_error_strings,
+
+ .runtime_data_bytes = 0,
+
+ .n_next_nodes = SR_REWRITE_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [SR_REWRITE_NEXT_##s] = n,
+ foreach_sr_rewrite_next
+#undef _
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (sr_rewrite_node, sr_rewrite)
+/* *INDENT-ON* */
+
+static int
+ip6_delete_route_no_next_hop (ip6_address_t * dst_address_arg,
+ u32 dst_address_length, u32 rx_table_id)
+{
+ fib_prefix_t pfx = {
+ .fp_len = dst_address_length,
+ .fp_proto = FIB_PROTOCOL_IP6,
+ .fp_addr = {
+ .ip6 = *dst_address_arg,
+ }
+ };
+
+ fib_table_entry_delete (fib_table_id_find_fib_index (FIB_PROTOCOL_IP6,
+ rx_table_id),
+ &pfx, FIB_SOURCE_SR);
+
+ return 0;
+}
+
+/**
+ * @brief Find or add if not found - HMAC shared secret
+ *
+ * @param sm ip6_sr_main_t *
+ * @param secret u8 *
+ * @param indexp u32 *
+ *
+ * @return ip6_sr_hmac_key_t *
+ */
+static ip6_sr_hmac_key_t *
+find_or_add_shared_secret (ip6_sr_main_t * sm, u8 * secret, u32 * indexp)
+{
+ uword *p;
+ ip6_sr_hmac_key_t *key = 0;
+ int i;
+
+ p = hash_get_mem (sm->hmac_key_by_shared_secret, secret);
+
+ if (p)
+ {
+ key = vec_elt_at_index (sm->hmac_keys, p[0]);
+ if (indexp)
+ *indexp = p[0];
+ return (key);
+ }
+
+ /* Specific key ID? */
+ if (indexp && *indexp)
+ {
+ vec_validate (sm->hmac_keys, *indexp);
+ key = sm->hmac_keys + *indexp;
+ }
+ else
+ {
+ for (i = 0; i < vec_len (sm->hmac_keys); i++)
+ {
+ if (sm->hmac_keys[i].shared_secret == 0)
+ {
+ key = sm->hmac_keys + i;
+ goto found;
+ }
+ }
+ vec_validate (sm->hmac_keys, i);
+ key = sm->hmac_keys + i;
+ found:
+ ;
+ }
+
+ key->shared_secret = vec_dup (secret);
+
+ hash_set_mem (sm->hmac_key_by_shared_secret, key->shared_secret,
+ key - sm->hmac_keys);
+
+ if (indexp)
+ *indexp = key - sm->hmac_keys;
+ return (key);
+}
+
+/**
+ * @brief Add or Delete a Segment Routing tunnel.
+ *
+ * @param a ip6_sr_add_del_tunnel_args_t *
+ *
+ * @return retval int
+ */
+int
+ip6_sr_add_del_tunnel (ip6_sr_add_del_tunnel_args_t * a)
+{
+ ip6_main_t *im = &ip6_main;
+ ip6_sr_tunnel_key_t key;
+ ip6_sr_tunnel_t *t;
+ uword *p, *n;
+ ip6_sr_header_t *h = 0;
+ u32 header_length;
+ ip6_address_t *addrp, *this_address;
+ ip6_sr_main_t *sm = &sr_main;
+ u8 *key_copy;
+ u32 rx_fib_index, tx_fib_index;
+ u32 hmac_key_index_u32;
+ u8 hmac_key_index = 0;
+ ip6_sr_policy_t *pt;
+ int i;
+ dpo_id_t dpo = DPO_INVALID;
+
+ /* Make sure that the rx FIB exists */
+ p = hash_get (im->fib_index_by_table_id, a->rx_table_id);
+
+ if (p == 0)
+ return -3;
+
+ /* remember the FIB index */
+ rx_fib_index = p[0];
+
+ /* Make sure that the supplied FIB exists */
+ p = hash_get (im->fib_index_by_table_id, a->tx_table_id);
+
+ if (p == 0)
+ return -4;
+
+ /* remember the FIB index */
+ tx_fib_index = p[0];
+
+ clib_memcpy (key.src.as_u8, a->src_address->as_u8, sizeof (key.src));
+ clib_memcpy (key.dst.as_u8, a->dst_address->as_u8, sizeof (key.dst));
+
+ /* When adding a tunnel:
+ * - If a "name" is given, it must not exist.
+ * - The "key" is always checked, and must not exist.
+ * When deleting a tunnel:
+ * - If the "name" is given, and it exists, then use it.
+ * - If the "name" is not given, use the "key".
+ * - If the "name" and the "key" are given, then both must point to the same
+ * thing.
+ */
+
+ /* Lookup the key */
+ p = hash_get_mem (sm->tunnel_index_by_key, &key);
+
+ /* If the name is given, look it up */
+ if (a->name)
+ n = hash_get_mem (sm->tunnel_index_by_name, a->name);
+ else
+ n = 0;
+
+ /* validate key/name parameters */
+ if (!a->is_del) /* adding a tunnel */
+ {
+ if (a->name && n) /* name given & exists already */
+ return -1;
+ if (p) /* key exists already */
+ return -1;
+ }
+ else /* deleting a tunnel */
+ {
+ if (!p) /* key doesn't exist */
+ return -2;
+ if (a->name && !n) /* name given & it doesn't exist */
+ return -2;
+
+ if (n) /* name given & found */
+ {
+ if (n[0] != p[0]) /* name and key do not point to the same thing */
+ return -2;
+ }
+ }
+
+
+ if (a->is_del) /* delete the tunnel */
+ {
+ hash_pair_t *hp;
+
+ /* Delete existing tunnel */
+ t = pool_elt_at_index (sm->tunnels, p[0]);
+
+ ip6_delete_route_no_next_hop (&t->key.dst, t->dst_mask_width,
+ a->rx_table_id);
+ vec_free (t->rewrite);
+ /* Remove tunnel from any policy if associated */
+ if (t->policy_index != ~0)
+ {
+ pt = pool_elt_at_index (sm->policies, t->policy_index);
+ for (i = 0; i < vec_len (pt->tunnel_indices); i++)
+ {
+ if (pt->tunnel_indices[i] == t - sm->tunnels)
+ {
+ vec_delete (pt->tunnel_indices, 1, i);
+ goto found;
+ }
+ }
+ clib_warning ("Tunnel index %d not found in policy_index %d",
+ t - sm->tunnels, pt - sm->policies);
+ found:
+ /* If this is last tunnel in the policy, clean up the policy too */
+ if (vec_len (pt->tunnel_indices) == 0)
+ {
+ hash_unset_mem (sm->policy_index_by_policy_name, pt->name);
+ vec_free (pt->name);
+ pool_put (sm->policies, pt);
+ }
+ }
+
+ /* Clean up the tunnel by name */
+ if (t->name)
+ {
+ hash_unset_mem (sm->tunnel_index_by_name, t->name);
+ vec_free (t->name);
+ }
+ pool_put (sm->tunnels, t);
+ hp = hash_get_pair (sm->tunnel_index_by_key, &key);
+ key_copy = (void *) (hp->key);
+ hash_unset_mem (sm->tunnel_index_by_key, &key);
+ vec_free (key_copy);
+ return 0;
+ }
+
+ /* create a new tunnel */
+ pool_get (sm->tunnels, t);
+ memset (t, 0, sizeof (*t));
+ t->policy_index = ~0;
+
+ clib_memcpy (&t->key, &key, sizeof (t->key));
+ t->dst_mask_width = a->dst_mask_width;
+ t->rx_fib_index = rx_fib_index;
+ t->tx_fib_index = tx_fib_index;
+
+ if (!vec_len (a->segments))
+ /* there must be at least one segment... */
+ return -4;
+
+ /* The first specified hop goes right into the dst address */
+ clib_memcpy (&t->first_hop, &a->segments[0], sizeof (ip6_address_t));
+
+ /*
+ * Create the sr header rewrite string
+ * The list of segments needs an extra slot for the ultimate destination
+ * which is taken from the packet we add the SRH to.
+ */
+ header_length = sizeof (*h) +
+ sizeof (ip6_address_t) * (vec_len (a->segments) + 1 + vec_len (a->tags));
+
+ if (a->shared_secret)
+ {
+ /* Allocate a new key slot if we don't find the secret key */
+ hmac_key_index_u32 = 0;
+ (void) find_or_add_shared_secret (sm, a->shared_secret,
+ &hmac_key_index_u32);
+
+ /* Hey Vinz Clortho: Gozzer is pissed.. you're out of keys! */
+ if (hmac_key_index_u32 >= 256)
+ return -5;
+ hmac_key_index = hmac_key_index_u32;
+ header_length += SHA256_DIGEST_LENGTH;
+ }
+
+ vec_validate (t->rewrite, header_length - 1);
+
+ h = (ip6_sr_header_t *) t->rewrite;
+
+ h->protocol = 0xFF; /* we don't know yet */
+
+ h->length = (header_length / 8) - 1;
+ h->type = ROUTING_HEADER_TYPE_SR;
+
+ /* first_segment and segments_left need to have the index of the last
+ * element in the list; a->segments has one element less than ends up
+ * in the header (it does not have the DA in it), so vec_len(a->segments)
+ * is the value we want.
+ */
+ h->first_segment = h->segments_left = vec_len (a->segments);
+
+ if (a->shared_secret)
+ h->hmac_key = hmac_key_index & 0xFF;
+
+ h->flags = a->flags_net_byte_order;
+
+ /* Paint on the segment list, in reverse.
+ * This is offset by one to leave room at the start for the ultimate
+ * destination.
+ */
+ addrp = h->segments + vec_len (a->segments);
+
+ vec_foreach (this_address, a->segments)
+ {
+ clib_memcpy (addrp->as_u8, this_address->as_u8, sizeof (ip6_address_t));
+ addrp--;
+ }
+
+ /*
+ * Since the ultimate destination address is not yet known, set that slot
+ * to a value we will instantly recognize as bogus.
+ */
+ memset (h->segments, 0xfe, sizeof (ip6_address_t));
+
+ /* Paint on the tag list, not reversed */
+ addrp = h->segments + vec_len (a->segments);
+
+ vec_foreach (this_address, a->tags)
+ {
+ clib_memcpy (addrp->as_u8, this_address->as_u8, sizeof (ip6_address_t));
+ addrp++;
+ }
+
+ key_copy = vec_new (ip6_sr_tunnel_key_t, 1);
+ clib_memcpy (key_copy, &key, sizeof (ip6_sr_tunnel_key_t));
+ hash_set_mem (sm->tunnel_index_by_key, key_copy, t - sm->tunnels);
+
+ /*
+ * Stick the tunnel index into the rewrite header.
+ *
+ * Unfortunately, inserting an SR header according to the various
+ * RFC's requires parsing through the ip6 header, perhaps consing a
+ * buffer onto the head of the vlib_buffer_t, etc. We don't use the
+ * normal reverse bcopy rewrite code.
+ *
+ * We don't handle ugly RFC-related cases yet, but I'm sure PL will complain
+ * at some point...
+ */
+ dpo_set (&dpo, sr_dpo_type, DPO_PROTO_IP6, t - sm->tunnels);
+
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP6,
+ .fp_len = a->dst_mask_width,
+ .fp_addr = {
+ .ip6 = *a->dst_address,
+ }
+ };
+ fib_table_entry_special_dpo_add (rx_fib_index,
+ &pfx,
+ FIB_SOURCE_SR,
+ FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
+ dpo_reset (&dpo);
+
+ if (a->policy_name)
+ {
+ p = hash_get_mem (sm->policy_index_by_policy_name, a->policy_name);
+ if (p)
+ {
+ pt = pool_elt_at_index (sm->policies, p[0]);
+ }
+ else /* no policy, lets create one */
+ {
+ pool_get (sm->policies, pt);
+ memset (pt, 0, sizeof (*pt));
+ pt->name = format (0, "%s%c", a->policy_name, 0);
+ hash_set_mem (sm->policy_index_by_policy_name, pt->name,
+ pt - sm->policies);
+ p = hash_get_mem (sm->policy_index_by_policy_name, a->policy_name);
+ }
+ vec_add1 (pt->tunnel_indices, t - sm->tunnels);
+ if (p == 0)
+ clib_warning ("p is NULL!");
+ t->policy_index = p ? p[0] : ~0; /* equiv. to (pt - sm->policies) */
+ }
+
+ if (a->name)
+ {
+ t->name = format (0, "%s%c", a->name, 0);
+ hash_set_mem (sm->tunnel_index_by_name, t->name, t - sm->tunnels);
+ }
+
+ return 0;
+}
+
+/**
+ * @brief no-op lock function.
+ * The lifetime of the SR entry is managed by the control plane
+ */
+static void
+sr_dpo_lock (dpo_id_t * dpo)
+{
+}
+
+/**
+ * @brief no-op unlock function.
+ * The lifetime of the SR entry is managed by the control plane
+ */
+static void
+sr_dpo_unlock (dpo_id_t * dpo)
+{
+}
+
+u8 *
+format_sr_dpo (u8 * s, va_list * args)
+{
+ index_t index = va_arg (*args, index_t);
+ CLIB_UNUSED (u32 indent) = va_arg (*args, u32);
+
+ return (format (s, "SR: tunnel:[%d]", index));
+}
+
+const static dpo_vft_t sr_vft = {
+ .dv_lock = sr_dpo_lock,
+ .dv_unlock = sr_dpo_unlock,
+ .dv_format = format_sr_dpo,
+};
+
+const static char *const sr_ip6_nodes[] = {
+ "sr-rewrite",
+ NULL,
+};
+
+const static char *const *const sr_nodes[DPO_PROTO_NUM] = {
+ [DPO_PROTO_IP6] = sr_ip6_nodes,
+};
+
+/**
+ * @brief CLI parser for Add or Delete a Segment Routing tunnel.
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+sr_add_del_tunnel_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ int is_del = 0;
+ ip6_address_t src_address;
+ int src_address_set = 0;
+ ip6_address_t dst_address;
+ u32 dst_mask_width;
+ int dst_address_set = 0;
+ u16 flags = 0;
+ u8 *shared_secret = 0;
+ u8 *name = 0;
+ u8 *policy_name = 0;
+ u32 rx_table_id = 0;
+ u32 tx_table_id = 0;
+ ip6_address_t *segments = 0;
+ ip6_address_t *this_seg;
+ ip6_address_t *tags = 0;
+ ip6_address_t *this_tag;
+ ip6_sr_add_del_tunnel_args_t _a, *a = &_a;
+ ip6_address_t next_address, tag;
+ int pl_index;
+ int rv;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "del"))
+ is_del = 1;
+ else if (unformat (input, "rx-fib-id %d", &rx_table_id))
+ ;
+ else if (unformat (input, "tx-fib-id %d", &tx_table_id))
+ ;
+ else if (unformat (input, "src %U", unformat_ip6_address, &src_address))
+ src_address_set = 1;
+ else if (unformat (input, "name %s", &name))
+ ;
+ else if (unformat (input, "policy %s", &policy_name))
+ ;
+ else if (unformat (input, "dst %U/%d",
+ unformat_ip6_address, &dst_address, &dst_mask_width))
+ dst_address_set = 1;
+ else if (unformat (input, "next %U", unformat_ip6_address,
+ &next_address))
+ {
+ vec_add2 (segments, this_seg, 1);
+ clib_memcpy (this_seg->as_u8, next_address.as_u8,
+ sizeof (*this_seg));
+ }
+ else if (unformat (input, "tag %U", unformat_ip6_address, &tag))
+ {
+ vec_add2 (tags, this_tag, 1);
+ clib_memcpy (this_tag->as_u8, tag.as_u8, sizeof (*this_tag));
+ }
+ else if (unformat (input, "clean"))
+ flags |= IP6_SR_HEADER_FLAG_CLEANUP;
+ else if (unformat (input, "protected"))
+ flags |= IP6_SR_HEADER_FLAG_PROTECTED;
+ else if (unformat (input, "key %s", &shared_secret))
+ /* Do not include the trailing NULL byte. Guaranteed interop issue */
+ _vec_len (shared_secret) -= 1;
+ else if (unformat (input, "InPE %d", &pl_index))
+ {
+ if (pl_index <= 0 || pl_index > 4)
+ {
+ pl_index_range_error:
+ return clib_error_return
+ (0, "Policy List Element Index %d out of range (1-4)",
+ pl_index);
+
+ }
+ flags |= IP6_SR_HEADER_FLAG_PL_ELT_INGRESS_PE
+ << ip6_sr_policy_list_shift_from_index (pl_index);
+ }
+ else if (unformat (input, "EgPE %d", &pl_index))
+ {
+ if (pl_index <= 0 || pl_index > 4)
+ goto pl_index_range_error;
+ flags |= IP6_SR_HEADER_FLAG_PL_ELT_EGRESS_PE
+ << ip6_sr_policy_list_shift_from_index (pl_index);
+ }
+ else if (unformat (input, "OrgSrc %d", &pl_index))
+ {
+ if (pl_index <= 0 || pl_index > 4)
+ goto pl_index_range_error;
+ flags |= IP6_SR_HEADER_FLAG_PL_ELT_ORIG_SRC_ADDR
+ << ip6_sr_policy_list_shift_from_index (pl_index);
+ }
+ else
+ break;
+ }
+
+ if (!src_address_set)
+ return clib_error_return (0, "src address required");
+
+ if (!dst_address_set)
+ return clib_error_return (0, "dst address required");
+
+ if (!segments)
+ return clib_error_return (0, "at least one sr segment required");
+
+ memset (a, 0, sizeof (*a));
+ a->src_address = &src_address;
+ a->dst_address = &dst_address;
+ a->dst_mask_width = dst_mask_width;
+ a->segments = segments;
+ a->tags = tags;
+ a->flags_net_byte_order = clib_host_to_net_u16 (flags);
+ a->is_del = is_del;
+ a->rx_table_id = rx_table_id;
+ a->tx_table_id = tx_table_id;
+ a->shared_secret = shared_secret;
+
+ if (vec_len (name))
+ a->name = name;
+ else
+ a->name = 0;
+
+ if (vec_len (policy_name))
+ a->policy_name = policy_name;
+ else
+ a->policy_name = 0;
+
+ rv = ip6_sr_add_del_tunnel (a);
+
+ vec_free (segments);
+ vec_free (tags);
+ vec_free (shared_secret);
+
+ switch (rv)
+ {
+ case 0:
+ break;
+
+ case -1:
+ return clib_error_return (0, "SR tunnel src %U dst %U already exists",
+ format_ip6_address, &src_address,
+ format_ip6_address, &dst_address);
+
+ case -2:
+ return clib_error_return (0, "SR tunnel src %U dst %U does not exist",
+ format_ip6_address, &src_address,
+ format_ip6_address, &dst_address);
+
+ case -3:
+ return clib_error_return (0, "FIB table %d does not exist",
+ rx_table_id);
+
+ case -4:
+ return clib_error_return (0, "At least one segment is required");
+
+ default:
+ return clib_error_return (0, "BUG: ip6_sr_add_del_tunnel returns %d",
+ rv);
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (sr_tunnel_command, static) = {
+ .path = "sr tunnel",
+ .short_help =
+ "sr tunnel [del] [name <name>] src <addr> dst <addr> [next <addr>] "
+ "[clean] [reroute] [key <secret>] [policy <policy_name>]"
+ "[rx-fib-id <fib_id>] [tx-fib-id <fib_id>]",
+ .function = sr_add_del_tunnel_command_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief Display Segment Routing tunnel
+ *
+ * @param vm vlib_main_t *
+ * @param t ip6_sr_tunnel_t *
+ *
+ */
+void
+ip6_sr_tunnel_display (vlib_main_t * vm, ip6_sr_tunnel_t * t)
+{
+ ip6_sr_main_t *sm = &sr_main;
+ ip6_fib_t *rx_fib, *tx_fib;
+ ip6_sr_policy_t *pt;
+
+ rx_fib = ip6_fib_get (t->rx_fib_index);
+ tx_fib = ip6_fib_get (t->tx_fib_index);
+
+ if (t->name)
+ vlib_cli_output (vm, "sr tunnel name: %s", (char *) t->name);
+
+ vlib_cli_output (vm, "src %U dst %U first hop %U",
+ format_ip6_address, &t->key.src,
+ format_ip6_address, &t->key.dst,
+ format_ip6_address, &t->first_hop);
+ vlib_cli_output (vm, " rx-fib-id %d tx-fib-id %d",
+ rx_fib->table_id, tx_fib->table_id);
+ vlib_cli_output (vm, " sr: %U", format_ip6_sr_header, t->rewrite,
+ 0 /* print_hmac */ );
+
+ if (t->policy_index != ~0)
+ {
+ pt = pool_elt_at_index (sm->policies, t->policy_index);
+ vlib_cli_output (vm, "sr policy: %s", (char *) pt->name);
+ }
+ vlib_cli_output (vm, "-------");
+
+ return;
+}
+
+/**
+ * @brief CLI Parser for Display Segment Routing tunnel
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+show_sr_tunnel_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ static ip6_sr_tunnel_t **tunnels;
+ ip6_sr_tunnel_t *t;
+ ip6_sr_main_t *sm = &sr_main;
+ int i;
+ uword *p = 0;
+ u8 *name = 0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "name %s", &name))
+ {
+ p = hash_get_mem (sm->tunnel_index_by_name, name);
+ if (!p)
+ vlib_cli_output (vm, "No SR tunnel with name: %s. Showing all.",
+ name);
+ }
+ else
+ break;
+ }
+
+ vec_reset_length (tunnels);
+
+ if (!p) /* Either name parm not passed or no tunnel with that name found, show all */
+ {
+ /* *INDENT-OFF* */
+ pool_foreach (t, sm->tunnels,
+ ({
+ vec_add1 (tunnels, t);
+ }));
+ /* *INDENT-ON* */
+ }
+ else /* Just show the one tunnel by name */
+ vec_add1 (tunnels, &sm->tunnels[p[0]]);
+
+ if (vec_len (tunnels) == 0)
+ vlib_cli_output (vm, "No SR tunnels configured");
+
+ for (i = 0; i < vec_len (tunnels); i++)
+ {
+ t = tunnels[i];
+ ip6_sr_tunnel_display (vm, t);
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_sr_tunnel_command, static) = {
+ .path = "show sr tunnel",
+ .short_help = "show sr tunnel [name <sr-tunnel-name>]",
+ .function = show_sr_tunnel_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief Add or Delete a Segment Routing policy
+ *
+ * @param a ip6_sr_add_del_policy_args_t *
+ *
+ * @return retval int
+ */
+int
+ip6_sr_add_del_policy (ip6_sr_add_del_policy_args_t * a)
+{
+ ip6_sr_main_t *sm = &sr_main;
+ uword *p;
+ ip6_sr_tunnel_t *t = 0;
+ ip6_sr_policy_t *policy;
+ u32 *tunnel_indices = 0;
+ int i;
+
+
+
+ if (a->is_del)
+ {
+ p = hash_get_mem (sm->policy_index_by_policy_name, a->name);
+ if (!p)
+ return -6; /* policy name not found */
+
+ policy = pool_elt_at_index (sm->policies, p[0]);
+
+ vec_foreach_index (i, policy->tunnel_indices)
+ {
+ t = pool_elt_at_index (sm->tunnels, policy->tunnel_indices[i]);
+ t->policy_index = ~0;
+ }
+ hash_unset_mem (sm->policy_index_by_policy_name, a->name);
+ pool_put (sm->policies, policy);
+ return 0;
+ }
+
+
+ if (!vec_len (a->tunnel_names))
+ return -3; /*tunnel name is required case */
+
+ vec_reset_length (tunnel_indices);
+ /* Check tunnel names, add tunnel_index to policy */
+ for (i = 0; i < vec_len (a->tunnel_names); i++)
+ {
+ p = hash_get_mem (sm->tunnel_index_by_name, a->tunnel_names[i]);
+ if (!p)
+ return -4; /* tunnel name not found case */
+
+ t = pool_elt_at_index (sm->tunnels, p[0]);
+ /*
+ No need to check t==0. -3 condition above ensures name
+ */
+ if (t->policy_index != ~0)
+ return -5; /* tunnel name already associated with a policy */
+
+ /* Add to tunnel indicies */
+ vec_add1 (tunnel_indices, p[0]);
+ }
+
+ /* Add policy to ip6_sr_main_t */
+ pool_get (sm->policies, policy);
+ policy->name = a->name;
+ policy->tunnel_indices = tunnel_indices;
+ hash_set_mem (sm->policy_index_by_policy_name, policy->name,
+ policy - sm->policies);
+
+ /* Yes, this could be construed as overkill but the last thing you should do is set
+ the policy_index on the tunnel after everything is set in ip6_sr_main_t.
+ If this is deemed overly cautious, could set this in the vec_len(tunnel_names) loop.
+ */
+ for (i = 0; i < vec_len (policy->tunnel_indices); i++)
+ {
+ t = pool_elt_at_index (sm->tunnels, policy->tunnel_indices[i]);
+ t->policy_index = policy - sm->policies;
+ }
+
+ return 0;
+}
+
+/**
+ * @brief CLI Parser for Add or Delete a Segment Routing policy
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+sr_add_del_policy_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ int is_del = 0;
+ u8 **tunnel_names = 0;
+ u8 *tunnel_name = 0;
+ u8 *name = 0;
+ ip6_sr_add_del_policy_args_t _a, *a = &_a;
+ int rv;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "del"))
+ is_del = 1;
+ else if (unformat (input, "name %s", &name))
+ ;
+ else if (unformat (input, "tunnel %s", &tunnel_name))
+ {
+ if (tunnel_name)
+ {
+ vec_add1 (tunnel_names, tunnel_name);
+ tunnel_name = 0;
+ }
+ }
+ else
+ break;
+ }
+
+ if (!name)
+ return clib_error_return (0, "name of SR policy required");
+
+
+ memset (a, 0, sizeof (*a));
+
+ a->is_del = is_del;
+ a->name = name;
+ a->tunnel_names = tunnel_names;
+
+ rv = ip6_sr_add_del_policy (a);
+
+ vec_free (tunnel_names);
+
+ switch (rv)
+ {
+ case 0:
+ break;
+
+ case -3:
+ return clib_error_return (0,
+ "tunnel name to associate to SR policy is required");
+
+ case -4:
+ return clib_error_return (0, "tunnel name not found");
+
+ case -5:
+ return clib_error_return (0, "tunnel already associated with policy");
+
+ case -6:
+ return clib_error_return (0, "policy name %s not found", name);
+
+ case -7:
+ return clib_error_return (0, "TODO: deleting policy name %s", name);
+
+ default:
+ return clib_error_return (0, "BUG: ip6_sr_add_del_policy returns %d",
+ rv);
+
+ }
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (sr_policy_command, static) = {
+ .path = "sr policy",
+ .short_help =
+ "sr policy [del] name <policy-name> tunnel <sr-tunnel-name> [tunnel <sr-tunnel-name>]*",
+ .function = sr_add_del_policy_command_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief CLI Parser for Displaying Segment Routing policy
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+show_sr_policy_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ static ip6_sr_policy_t **policies;
+ ip6_sr_policy_t *policy;
+ ip6_sr_tunnel_t *t;
+ ip6_sr_main_t *sm = &sr_main;
+ int i, j;
+ uword *p = 0;
+ u8 *name = 0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "name %s", &name))
+ {
+ p = hash_get_mem (sm->policy_index_by_policy_name, name);
+ if (!p)
+ vlib_cli_output (vm,
+ "policy with name %s not found. Showing all.",
+ name);
+ }
+ else
+ break;
+ }
+
+ vec_reset_length (policies);
+
+ if (!p) /* Either name parm not passed or no policy with that name found, show all */
+ {
+ /* *INDENT-OFF* */
+ pool_foreach (policy, sm->policies,
+ ({
+ vec_add1 (policies, policy);
+ }));
+ /* *INDENT-ON* */
+ }
+ else /* Just show the one policy by name and a summary of tunnel names */
+ {
+ policy = pool_elt_at_index (sm->policies, p[0]);
+ vec_add1 (policies, policy);
+ }
+
+ if (vec_len (policies) == 0)
+ vlib_cli_output (vm, "No SR policies configured");
+
+ for (i = 0; i < vec_len (policies); i++)
+ {
+ policy = policies[i];
+
+ if (policy->name)
+ vlib_cli_output (vm, "SR policy name: %s", (char *) policy->name);
+ for (j = 0; j < vec_len (policy->tunnel_indices); j++)
+ {
+ t = pool_elt_at_index (sm->tunnels, policy->tunnel_indices[j]);
+ ip6_sr_tunnel_display (vm, t);
+ }
+ }
+
+ return 0;
+
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_sr_policy_command, static) = {
+ .path = "show sr policy",
+ .short_help = "show sr policy [name <sr-policy-name>]",
+ .function = show_sr_policy_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief Add or Delete a mapping of IP6 multicast address
+ * to Segment Routing policy.
+ *
+ * @param a ip6_sr_add_del_multicastmap_args_t *
+ *
+ * @return retval int
+ */
+int
+ip6_sr_add_del_multicastmap (ip6_sr_add_del_multicastmap_args_t * a)
+{
+ uword *p;
+ ip6_sr_tunnel_t *t;
+ ip6_sr_main_t *sm = &sr_main;
+ ip6_sr_policy_t *pt;
+
+ if (a->is_del)
+ {
+ /* clean up the adjacency */
+ p =
+ hash_get_mem (sm->policy_index_by_multicast_address,
+ a->multicast_address);
+ }
+ else
+ {
+ /* Get our policy by policy_name */
+ p = hash_get_mem (sm->policy_index_by_policy_name, a->policy_name);
+
+ }
+ if (!p)
+ return -1;
+
+ pt = pool_elt_at_index (sm->policies, p[0]);
+
+ /*
+ Get the first tunnel associated with policy populate the fib adjacency.
+ From there, since this tunnel will have it's policy_index != ~0 it will
+ be the trigger in the dual_loop to pull up the policy and make a copy-rewrite
+ for each tunnel in the policy
+ */
+
+ t = pool_elt_at_index (sm->tunnels, pt->tunnel_indices[0]);
+
+ /*
+ * Stick the tunnel index into the rewrite header.
+ *
+ * Unfortunately, inserting an SR header according to the various
+ * RFC's requires parsing through the ip6 header, perhaps consing a
+ * buffer onto the head of the vlib_buffer_t, etc. We don't use the
+ * normal reverse bcopy rewrite code.
+ *
+ * We don't handle ugly RFC-related cases yet, but I'm sure PL will complain
+ * at some point...
+ */
+ dpo_id_t dpo = DPO_INVALID;
+
+ dpo_set (&dpo, sr_dpo_type, DPO_PROTO_IP6, t - sm->tunnels);
+
+ /* Construct a FIB entry for multicast using the rx/tx fib from the first tunnel */
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP6,
+ .fp_len = 128,
+ .fp_addr = {
+ .ip6 = *a->multicast_address,
+ }
+ };
+ fib_table_entry_special_dpo_add (t->rx_fib_index,
+ &pfx,
+ FIB_SOURCE_SR,
+ FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
+ dpo_reset (&dpo);
+
+ u8 *mcast_copy = 0;
+ mcast_copy = vec_new (ip6_address_t, 1);
+ memcpy (mcast_copy, a->multicast_address, sizeof (ip6_address_t));
+
+ if (a->is_del)
+ {
+ hash_unset_mem (sm->policy_index_by_multicast_address, mcast_copy);
+ vec_free (mcast_copy);
+ return 0;
+ }
+ /* else */
+
+ hash_set_mem (sm->policy_index_by_multicast_address, mcast_copy,
+ pt - sm->policies);
+
+
+ return 0;
+}
+
+/**
+ * @brief CLI Parser for Adding or Delete a mapping of IP6 multicast address
+ * to Segment Routing policy.
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+sr_add_del_multicast_map_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ int is_del = 0;
+ ip6_address_t multicast_address;
+ u8 *policy_name = 0;
+ int multicast_address_set = 0;
+ ip6_sr_add_del_multicastmap_args_t _a, *a = &_a;
+ int rv;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "del"))
+ is_del = 1;
+ else
+ if (unformat
+ (input, "address %U", unformat_ip6_address, &multicast_address))
+ multicast_address_set = 1;
+ else if (unformat (input, "sr-policy %s", &policy_name))
+ ;
+ else
+ break;
+ }
+
+ if (!is_del && !policy_name)
+ return clib_error_return (0, "name of sr policy required");
+
+ if (!multicast_address_set)
+ return clib_error_return (0, "multicast address required");
+
+ memset (a, 0, sizeof (*a));
+
+ a->is_del = is_del;
+ a->multicast_address = &multicast_address;
+ a->policy_name = policy_name;
+
+#if DPDK > 0 /*Cannot call replicate or configure multicast map yet without DPDK */
+ rv = ip6_sr_add_del_multicastmap (a);
+#else
+ return clib_error_return (0,
+ "cannot use multicast replicate spray case without DPDK installed");
+#endif /* DPDK */
+
+ switch (rv)
+ {
+ case 0:
+ break;
+ case -1:
+ return clib_error_return (0, "no policy with name: %s", policy_name);
+
+ case -2:
+ return clib_error_return (0, "multicast map someting ");
+
+ case -3:
+ return clib_error_return (0,
+ "tunnel name to associate to SR policy is required");
+
+ case -7:
+ return clib_error_return (0, "TODO: deleting policy name %s",
+ policy_name);
+
+ default:
+ return clib_error_return (0, "BUG: ip6_sr_add_del_policy returns %d",
+ rv);
+
+ }
+ return 0;
+
+}
+
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (sr_multicast_map_command, static) = {
+ .path = "sr multicast-map",
+ .short_help =
+ "sr multicast-map address <multicast-ip6-address> sr-policy <sr-policy-name> [del]",
+ .function = sr_add_del_multicast_map_command_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief CLI Parser for Displaying a mapping of IP6 multicast address
+ * to Segment Routing policy.
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+show_sr_multicast_map_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ ip6_sr_main_t *sm = &sr_main;
+ u8 *key = 0;
+ u32 value;
+ ip6_address_t multicast_address;
+ ip6_sr_policy_t *pt;
+
+ /* pull all entries from the hash table into vector for display */
+
+ /* *INDENT-OFF* */
+ hash_foreach_mem (key, value, sm->policy_index_by_multicast_address,
+ ({
+ if (!key)
+ vlib_cli_output (vm, "no multicast maps configured");
+ else
+ {
+ multicast_address = *((ip6_address_t *)key);
+ pt = pool_elt_at_index (sm->policies, value);
+ if (pt)
+ {
+ vlib_cli_output (vm, "address: %U policy: %s",
+ format_ip6_address, &multicast_address,
+ pt->name);
+ }
+ else
+ vlib_cli_output (vm, "BUG: policy not found for address: %U with policy index %d",
+ format_ip6_address, &multicast_address,
+ value);
+
+ }
+
+ }));
+ /* *INDENT-ON* */
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_sr_multicast_map_command, static) = {
+ .path = "show sr multicast-map",
+ .short_help = "show sr multicast-map",
+ .function = show_sr_multicast_map_fn,
+};
+/* *INDENT-ON* */
+
+
+#define foreach_sr_fix_dst_addr_next \
+_(DROP, "error-drop")
+
+/**
+ * @brief Struct for valid next-nodes for SR fix destination address node
+ */
+typedef enum
+{
+#define _(s,n) SR_FIX_DST_ADDR_NEXT_##s,
+ foreach_sr_fix_dst_addr_next
+#undef _
+ SR_FIX_DST_ADDR_N_NEXT,
+} sr_fix_dst_addr_next_t;
+
+/**
+ * @brief Error strings for SR Fix Destination rewrite
+ */
+static char *sr_fix_dst_error_strings[] = {
+#define sr_fix_dst_error(n,s) s,
+#include "sr_fix_dst_error.def"
+#undef sr_fix_dst_error
+};
+
+/**
+ * @brief Struct for errors for SR Fix Destination rewrite
+ */
+typedef enum
+{
+#define sr_fix_dst_error(n,s) SR_FIX_DST_ERROR_##n,
+#include "sr_fix_dst_error.def"
+#undef sr_fix_dst_error
+ SR_FIX_DST_N_ERROR,
+} sr_fix_dst_error_t;
+
+/**
+ * @brief Information for fix address trace
+ */
+typedef struct
+{
+ ip6_address_t src, dst;
+ u32 next_index;
+ u32 adj_index;
+ u8 sr[256];
+} sr_fix_addr_trace_t;
+
+/**
+ * @brief Formatter for fix address trace
+ */
+u8 *
+format_sr_fix_addr_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 *);
+ sr_fix_addr_trace_t *t = va_arg (*args, sr_fix_addr_trace_t *);
+ vnet_hw_interface_t *hi = 0;
+ ip_adjacency_t *adj;
+ ip6_main_t *im = &ip6_main;
+ ip_lookup_main_t *lm = &im->lookup_main;
+ vnet_main_t *vnm = vnet_get_main ();
+
+ if (t->adj_index != ~0)
+ {
+ adj = ip_get_adjacency (lm, t->adj_index);
+ hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
+ }
+
+ s = format (s, "SR-FIX_ADDR: next %s ip6 src %U dst %U\n",
+ (t->next_index == SR_FIX_DST_ADDR_NEXT_DROP)
+ ? "drop" : "output",
+ format_ip6_address, &t->src, format_ip6_address, &t->dst);
+ if (t->next_index != SR_FIX_DST_ADDR_NEXT_DROP)
+ {
+ s =
+ format (s, "%U\n", format_ip6_sr_header, t->sr, 1 /* print_hmac */ );
+ s =
+ format (s, " output via %s",
+ hi ? (char *) (hi->name) : "Invalid adj");
+ }
+ return s;
+}
+
+/**
+ * @brief Fix SR destination address - dual-loop
+ *
+ * @node sr-fix-dst-addr
+ * @param vm vlib_main_t *
+ * @param node vlib_node_runtime_t *
+ * @param from_frame vlib_frame_t *
+ *
+ * @return from_frame->n_vectors uword
+ */
+static uword
+sr_fix_dst_addr (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+ ip6_main_t *im = &ip6_main;
+ ip_lookup_main_t *lm = &im->lookup_main;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+#if 0
+ while (0 && n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ __attribute__ ((unused)) vlib_buffer_t *b0, *b1;
+ u32 next0 = SR_FIX_DST_ADDR_NEXT_DROP;
+ u32 next1 = SR_FIX_DST_ADDR_NEXT_DROP;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+ }
+
+ bi0 = from[0];
+ bi1 = from[1];
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+#endif
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ ip6_header_t *ip0;
+ ip_adjacency_t *adj0;
+ ip6_sr_header_t *sr0;
+ u32 next0 = SR_FIX_DST_ADDR_NEXT_DROP;
+ ip6_address_t *new_dst0;
+ ethernet_header_t *eh0;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ adj0 =
+ ip_get_adjacency (lm, vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
+ next0 = adj0->mcast_group_index;
+
+ /* We should be pointing at an Ethernet header... */
+ eh0 = vlib_buffer_get_current (b0);
+ ip0 = (ip6_header_t *) (eh0 + 1);
+ sr0 = (ip6_sr_header_t *) (ip0 + 1);
+
+ /* We'd better find an SR header... */
+ if (PREDICT_FALSE (ip0->protocol != IPPROTO_IPV6_ROUTE))
+ {
+ b0->error = node->errors[SR_FIX_DST_ERROR_NO_SR_HEADER];
+ goto do_trace0;
+ }
+ else
+ {
+ /*
+ * We get here from sr_rewrite or sr_local, with
+ * sr->segments_left pointing at the (copy of the original) dst
+ * address. Use it, then increment sr0->segments_left.
+ */
+
+ /* Out of segments? Turf the packet */
+ if (PREDICT_FALSE (sr0->segments_left == 0))
+ {
+ b0->error = node->errors[SR_FIX_DST_ERROR_NO_MORE_SEGMENTS];
+ goto do_trace0;
+ }
+
+ /*
+ * Rewrite the packet with the original dst address
+ * We assume that the last segment (in processing order) contains
+ * the original dst address. The list is reversed, so sr0->segments
+ * contains the original dst address.
+ */
+ new_dst0 = sr0->segments;
+ ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
+ ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
+ }
+
+ do_trace0:
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_fix_addr_trace_t *t = vlib_add_trace (vm, node,
+ b0, sizeof (*t));
+ t->next_index = next0;
+ t->adj_index = ~0;
+
+ if (next0 != SR_FIX_DST_ADDR_NEXT_DROP)
+ {
+ t->adj_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
+ clib_memcpy (t->src.as_u8, ip0->src_address.as_u8,
+ sizeof (t->src.as_u8));
+ clib_memcpy (t->dst.as_u8, ip0->dst_address.as_u8,
+ sizeof (t->dst.as_u8));
+ clib_memcpy (t->sr, sr0, sizeof (t->sr));
+ }
+ }
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ return from_frame->n_vectors;
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (sr_fix_dst_addr_node) = {
+ .function = sr_fix_dst_addr,
+ .name = "sr-fix-dst-addr",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .format_trace = format_sr_fix_addr_trace,
+ .format_buffer = format_ip6_sr_header_with_length,
+
+ .runtime_data_bytes = 0,
+
+ .n_errors = SR_FIX_DST_N_ERROR,
+ .error_strings = sr_fix_dst_error_strings,
+
+ .n_next_nodes = SR_FIX_DST_ADDR_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [SR_FIX_DST_ADDR_NEXT_##s] = n,
+ foreach_sr_fix_dst_addr_next
+#undef _
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (sr_fix_dst_addr_node, sr_fix_dst_addr)
+/* *INDENT-ON* */
+
+static clib_error_t *
+sr_init (vlib_main_t * vm)
+{
+ ip6_sr_main_t *sm = &sr_main;
+ clib_error_t *error = 0;
+ vlib_node_t *ip6_lookup_node, *ip6_rewrite_node;
+
+ if ((error = vlib_call_init_function (vm, ip_main_init)))
+ return error;
+
+ if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
+ return error;
+
+ sm->vlib_main = vm;
+ sm->vnet_main = vnet_get_main ();
+
+ vec_validate (sm->hmac_keys, 0);
+ sm->hmac_keys[0].shared_secret = (u8 *) 0xdeadbeef;
+
+ sm->tunnel_index_by_key =
+ hash_create_mem (0, sizeof (ip6_sr_tunnel_key_t), sizeof (uword));
+
+ sm->tunnel_index_by_name = hash_create_string (0, sizeof (uword));
+
+ sm->policy_index_by_policy_name = hash_create_string (0, sizeof (uword));
+
+ sm->policy_index_by_multicast_address =
+ hash_create_mem (0, sizeof (ip6_address_t), sizeof (uword));
+
+ sm->hmac_key_by_shared_secret = hash_create_string (0, sizeof (uword));
+
+ ip6_register_protocol (IPPROTO_IPV6_ROUTE, sr_local_node.index);
+
+ ip6_lookup_node = vlib_get_node_by_name (vm, (u8 *) "ip6-lookup");
+ ASSERT (ip6_lookup_node);
+
+ ip6_rewrite_node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite");
+ ASSERT (ip6_rewrite_node);
+
+#if DPDK > 0 /* Cannot run replicate without DPDK */
+ /* Add a disposition to sr_replicate for the sr multicast replicate node */
+ sm->ip6_lookup_sr_replicate_index =
+ vlib_node_add_next (vm, ip6_lookup_node->index, sr_replicate_node.index);
+#endif /* DPDK */
+
+ /* Add a disposition to ip6_rewrite for the sr dst address hack node */
+ sm->ip6_rewrite_sr_next_index =
+ vlib_node_add_next (vm, ip6_rewrite_node->index,
+ sr_fix_dst_addr_node.index);
+
+ OpenSSL_add_all_digests ();
+
+ sm->md = (void *) EVP_get_digestbyname ("sha1");
+ sm->hmac_ctx = clib_mem_alloc (sizeof (HMAC_CTX));
+
+ sr_dpo_type = dpo_register_new_type (&sr_vft, sr_nodes);
+
+ return error;
+}
+
+VLIB_INIT_FUNCTION (sr_init);
+
+/**
+ * @brief Definition of next-nodes for SR local
+ */
+#define foreach_sr_local_next \
+ _ (ERROR, "error-drop") \
+ _ (IP6_LOOKUP, "ip6-lookup")
+
+/**
+ * @brief Struct for definition of next-nodes for SR local
+ */
+typedef enum
+{
+#define _(s,n) SR_LOCAL_NEXT_##s,
+ foreach_sr_local_next
+#undef _
+ SR_LOCAL_N_NEXT,
+} sr_local_next_t;
+
+/**
+ * @brief Struct for packet trace of SR local
+ */
+typedef struct
+{
+ u8 next_index;
+ u8 sr_valid;
+ ip6_address_t src, dst;
+ u16 length;
+ u8 sr[256];
+} sr_local_trace_t;
+
+/**
+ * @brief Definition of SR local error-strings
+ */
+static char *sr_local_error_strings[] = {
+#define sr_error(n,s) s,
+#include "sr_error.def"
+#undef sr_error
+};
+
+/**
+ * @brief Struct for definition of SR local error-strings
+ */
+typedef enum
+{
+#define sr_error(n,s) SR_LOCAL_ERROR_##n,
+#include "sr_error.def"
+#undef sr_error
+ SR_LOCAL_N_ERROR,
+} sr_local_error_t;
+
+/**
+ * @brief Format SR local trace
+ *
+ * @param s u8 *
+ * @param args va_list *
+ *
+ * @return s u8 *
+ */
+u8 *
+format_sr_local_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 *);
+ sr_local_trace_t *t = va_arg (*args, sr_local_trace_t *);
+
+ s = format (s, "SR-LOCAL: src %U dst %U len %u next_index %d",
+ format_ip6_address, &t->src,
+ format_ip6_address, &t->dst, t->length, t->next_index);
+ if (t->sr_valid)
+ s =
+ format (s, "\n %U", format_ip6_sr_header, t->sr, 1 /* print_hmac */ );
+ else
+ s = format (s, "\n popped SR header");
+
+ return s;
+}
+
+
+/* $$$$ fixme: smp, don't copy data, cache input, output (maybe) */
+/**
+ * @brief Validate the SR HMAC
+ *
+ * @param sm ip6_sr_main_t *
+ * @param ip ip6_header_t *
+ * @param sr ip6_sr_header_t *
+ *
+ * @return retval int
+ */
+static int
+sr_validate_hmac (ip6_sr_main_t * sm, ip6_header_t * ip, ip6_sr_header_t * sr)
+{
+ u32 key_index;
+ static u8 *keybuf;
+ u8 *copy_target;
+ int first_segment;
+ ip6_address_t *addrp;
+ int i;
+ ip6_sr_hmac_key_t *hmac_key;
+ static u8 *signature;
+ u32 sig_len;
+
+ key_index = sr->hmac_key;
+
+ /* No signature? Pass... */
+ if (key_index == 0)
+ return 0;
+
+ /* We don't know about this key? Fail... */
+ if (key_index >= vec_len (sm->hmac_keys))
+ return 1;
+
+ vec_validate (signature, SHA256_DIGEST_LENGTH - 1);
+
+ hmac_key = sm->hmac_keys + key_index;
+
+ vec_reset_length (keybuf);
+
+ /* pkt ip6 src address */
+ vec_add2 (keybuf, copy_target, sizeof (ip6_address_t));
+ clib_memcpy (copy_target, ip->src_address.as_u8, sizeof (ip6_address_t));
+
+ /* last segment */
+ vec_add2 (keybuf, copy_target, 1);
+ copy_target[0] = sr->first_segment;
+
+ /* octet w/ bit 0 = "clean" flag */
+ vec_add2 (keybuf, copy_target, 1);
+ copy_target[0]
+ = (sr->flags & clib_host_to_net_u16 (IP6_SR_HEADER_FLAG_CLEANUP))
+ ? 0x80 : 0;
+
+ /* hmac key id */
+ vec_add2 (keybuf, copy_target, 1);
+ copy_target[0] = sr->hmac_key;
+
+ first_segment = sr->first_segment;
+
+ addrp = sr->segments;
+
+ /* segments */
+ for (i = 0; i <= first_segment; i++)
+ {
+ vec_add2 (keybuf, copy_target, sizeof (ip6_address_t));
+ clib_memcpy (copy_target, addrp->as_u8, sizeof (ip6_address_t));
+ addrp++;
+ }
+
+ if (sm->is_debug)
+ clib_warning ("verify key index %d keybuf: %U", key_index,
+ format_hex_bytes, keybuf, vec_len (keybuf));
+
+ /* shared secret */
+
+ /* SHA1 is shorter than SHA-256 */
+ memset (signature, 0, vec_len (signature));
+
+ HMAC_CTX_init (sm->hmac_ctx);
+ if (!HMAC_Init (sm->hmac_ctx, hmac_key->shared_secret,
+ vec_len (hmac_key->shared_secret), sm->md))
+ clib_warning ("barf1");
+ if (!HMAC_Update (sm->hmac_ctx, keybuf, vec_len (keybuf)))
+ clib_warning ("barf2");
+ if (!HMAC_Final (sm->hmac_ctx, signature, &sig_len))
+ clib_warning ("barf3");
+ HMAC_CTX_cleanup (sm->hmac_ctx);
+
+ if (sm->is_debug)
+ clib_warning ("computed signature len %d, value %U", sig_len,
+ format_hex_bytes, signature, vec_len (signature));
+
+ /* Point at the SHA signature in the packet */
+ addrp++;
+ if (sm->is_debug)
+ clib_warning ("read signature %U", format_hex_bytes, addrp,
+ SHA256_DIGEST_LENGTH);
+
+ return memcmp (signature, addrp, SHA256_DIGEST_LENGTH);
+}
+
+/**
+ * @brief SR local node
+ * @node sr-local
+ *
+ * @param vm vlib_main_t *
+ * @param node vlib_node_runtime_t *
+ * @param from_frame vlib_frame_t *
+ *
+ * @return from_frame->n_vectors uword
+ */
+static uword
+sr_local (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+ ip6_sr_main_t *sm = &sr_main;
+ u32 (*sr_local_cb) (vlib_main_t *, vlib_node_runtime_t *,
+ vlib_buffer_t *, ip6_header_t *, ip6_sr_header_t *);
+ sr_local_cb = sm->sr_local_cb;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+ ip6_header_t *ip0, *ip1;
+ ip6_sr_header_t *sr0, *sr1;
+ ip6_address_t *new_dst0, *new_dst1;
+ u32 next0 = SR_LOCAL_NEXT_IP6_LOOKUP;
+ u32 next1 = SR_LOCAL_NEXT_IP6_LOOKUP;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+
+ bi0 = from[0];
+ bi1 = from[1];
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+
+ b0 = vlib_get_buffer (vm, bi0);
+ ip0 = vlib_buffer_get_current (b0);
+ sr0 = (ip6_sr_header_t *) (ip0 + 1);
+ if (PREDICT_FALSE
+ (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
+ sr0 =
+ (ip6_sr_header_t *) ip6_ext_next_header ((ip6_ext_header_t *)
+ ext_hdr);
+ }
+
+ if (PREDICT_FALSE (sr0->type != ROUTING_HEADER_TYPE_SR))
+ {
+ next0 = SR_LOCAL_NEXT_ERROR;
+ b0->error =
+ node->errors[SR_LOCAL_ERROR_BAD_ROUTING_HEADER_TYPE];
+ goto do_trace0;
+ }
+
+ /* Out of segments? Turf the packet */
+ if (PREDICT_FALSE (sr0->segments_left == 0))
+ {
+ next0 = SR_LOCAL_NEXT_ERROR;
+ b0->error = node->errors[SR_LOCAL_ERROR_NO_MORE_SEGMENTS];
+ goto do_trace0;
+ }
+
+ if (PREDICT_FALSE (sm->validate_hmac))
+ {
+ if (sr_validate_hmac (sm, ip0, sr0))
+ {
+ next0 = SR_LOCAL_NEXT_ERROR;
+ b0->error = node->errors[SR_LOCAL_ERROR_HMAC_INVALID];
+ goto do_trace0;
+ }
+ }
+
+ next0 = sr_local_cb ? sr_local_cb (vm, node, b0, ip0, sr0) : next0;
+
+ /*
+ * To suppress rewrite, return ~SR_LOCAL_NEXT_xxx
+ */
+ if (PREDICT_FALSE (next0 & 0x80000000))
+ {
+ next0 ^= 0xFFFFFFFF;
+ if (PREDICT_FALSE (next0 == SR_LOCAL_NEXT_ERROR))
+ b0->error = node->errors[SR_LOCAL_ERROR_APP_CALLBACK];
+ }
+ else
+ {
+ u32 segment_index0;
+
+ segment_index0 = sr0->segments_left - 1;
+
+ /* Rewrite the packet */
+ new_dst0 = (ip6_address_t *) (sr0->segments + segment_index0);
+ ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
+ ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
+
+ if (PREDICT_TRUE (sr0->segments_left > 0))
+ sr0->segments_left -= 1;
+ }
+
+ /* End of the path. Clean up the SR header, or not */
+ if (PREDICT_FALSE
+ (sr0->segments_left == 0 &&
+ (sr0->flags &
+ clib_host_to_net_u16 (IP6_SR_HEADER_FLAG_CLEANUP))))
+ {
+ u64 *copy_dst0, *copy_src0;
+ u16 new_l0;
+ u32 copy_len_u64s0 = 0;
+ int i;
+
+ /*
+ * Copy the ip6 header right by the (real) length of the
+ * sr header.
+ */
+ if (PREDICT_FALSE
+ (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
+ copy_len_u64s0 =
+ (((ip6_ext_header_t *) ext_hdr)->n_data_u64s) + 1;
+ ext_hdr->next_hdr = sr0->protocol;
+ }
+ else
+ {
+ ip0->protocol = sr0->protocol;
+ }
+ vlib_buffer_advance (b0, (sr0->length + 1) * 8);
+
+ new_l0 = clib_net_to_host_u16 (ip0->payload_length) -
+ (sr0->length + 1) * 8;
+ ip0->payload_length = clib_host_to_net_u16 (new_l0);
+
+ copy_src0 = (u64 *) ip0;
+ copy_dst0 = copy_src0 + (sr0->length + 1);
+
+ copy_dst0[4 + copy_len_u64s0] = copy_src0[4 + copy_len_u64s0];
+ copy_dst0[3 + copy_len_u64s0] = copy_src0[3 + copy_len_u64s0];
+ copy_dst0[2 + copy_len_u64s0] = copy_src0[2 + copy_len_u64s0];
+ copy_dst0[1 + copy_len_u64s0] = copy_src0[1 + copy_len_u64s0];
+ copy_dst0[0 + copy_len_u64s0] = copy_src0[0 + copy_len_u64s0];
+
+ for (i = copy_len_u64s0 - 1; i >= 0; i--)
+ {
+ copy_dst0[i] = copy_src0[i];
+ }
+
+ sr0 = 0;
+ }
+
+ do_trace0:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_local_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
+ sizeof (tr->src.as_u8));
+ clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
+ sizeof (tr->dst.as_u8));
+ tr->length = vlib_buffer_length_in_chain (vm, b0);
+ tr->next_index = next0;
+ tr->sr_valid = sr0 != 0;
+ if (tr->sr_valid)
+ clib_memcpy (tr->sr, sr0, sizeof (tr->sr));
+ }
+
+ b1 = vlib_get_buffer (vm, bi1);
+ ip1 = vlib_buffer_get_current (b1);
+ sr1 = (ip6_sr_header_t *) (ip1 + 1);
+ if (PREDICT_FALSE
+ (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip1);
+ sr1 =
+ (ip6_sr_header_t *) ip6_ext_next_header ((ip6_ext_header_t *)
+ ext_hdr);
+ }
+
+ if (PREDICT_FALSE (sr1->type != ROUTING_HEADER_TYPE_SR))
+ {
+ next1 = SR_LOCAL_NEXT_ERROR;
+ b1->error =
+ node->errors[SR_LOCAL_ERROR_BAD_ROUTING_HEADER_TYPE];
+ goto do_trace1;
+ }
+
+ /* Out of segments? Turf the packet */
+ if (PREDICT_FALSE (sr1->segments_left == 0))
+ {
+ next1 = SR_LOCAL_NEXT_ERROR;
+ b1->error = node->errors[SR_LOCAL_ERROR_NO_MORE_SEGMENTS];
+ goto do_trace1;
+ }
+
+ if (PREDICT_FALSE (sm->validate_hmac))
+ {
+ if (sr_validate_hmac (sm, ip1, sr1))
+ {
+ next1 = SR_LOCAL_NEXT_ERROR;
+ b1->error = node->errors[SR_LOCAL_ERROR_HMAC_INVALID];
+ goto do_trace1;
+ }
+ }
+
+ next1 = sr_local_cb ? sr_local_cb (vm, node, b1, ip1, sr1) : next1;
+
+ /*
+ * To suppress rewrite, return ~SR_LOCAL_NEXT_xxx
+ */
+ if (PREDICT_FALSE (next1 & 0x80000000))
+ {
+ next1 ^= 0xFFFFFFFF;
+ if (PREDICT_FALSE (next1 == SR_LOCAL_NEXT_ERROR))
+ b1->error = node->errors[SR_LOCAL_ERROR_APP_CALLBACK];
+ }
+ else
+ {
+ u32 segment_index1;
+
+ segment_index1 = sr1->segments_left - 1;
+
+ /* Rewrite the packet */
+ new_dst1 = (ip6_address_t *) (sr1->segments + segment_index1);
+ ip1->dst_address.as_u64[0] = new_dst1->as_u64[0];
+ ip1->dst_address.as_u64[1] = new_dst1->as_u64[1];
+
+ if (PREDICT_TRUE (sr1->segments_left > 0))
+ sr1->segments_left -= 1;
+ }
+
+ /* End of the path. Clean up the SR header, or not */
+ if (PREDICT_FALSE
+ (sr1->segments_left == 0 &&
+ (sr1->flags &
+ clib_host_to_net_u16 (IP6_SR_HEADER_FLAG_CLEANUP))))
+ {
+ u64 *copy_dst1, *copy_src1;
+ u16 new_l1;
+ u32 copy_len_u64s1 = 0;
+ int i;
+
+ /*
+ * Copy the ip6 header right by the (real) length of the
+ * sr header.
+ */
+ if (PREDICT_FALSE
+ (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip1);
+ copy_len_u64s1 =
+ (((ip6_ext_header_t *) ext_hdr)->n_data_u64s) + 1;
+ ext_hdr->next_hdr = sr1->protocol;
+ }
+ else
+ {
+ ip1->protocol = sr1->protocol;
+ }
+ vlib_buffer_advance (b1, (sr1->length + 1) * 8);
+
+ new_l1 = clib_net_to_host_u16 (ip1->payload_length) -
+ (sr1->length + 1) * 8;
+ ip1->payload_length = clib_host_to_net_u16 (new_l1);
+
+ copy_src1 = (u64 *) ip1;
+ copy_dst1 = copy_src1 + (sr1->length + 1);
+
+ copy_dst1[4 + copy_len_u64s1] = copy_src1[4 + copy_len_u64s1];
+ copy_dst1[3 + copy_len_u64s1] = copy_src1[3 + copy_len_u64s1];
+ copy_dst1[2 + copy_len_u64s1] = copy_src1[2 + copy_len_u64s1];
+ copy_dst1[1 + copy_len_u64s1] = copy_src1[1 + copy_len_u64s1];
+ copy_dst1[0 + copy_len_u64s1] = copy_src1[0 + copy_len_u64s1];
+
+ for (i = copy_len_u64s1 - 1; i >= 0; i--)
+ {
+ copy_dst1[i] = copy_src1[i];
+ }
+
+ sr1 = 0;
+ }
+
+ do_trace1:
+ if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_local_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ clib_memcpy (tr->src.as_u8, ip1->src_address.as_u8,
+ sizeof (tr->src.as_u8));
+ clib_memcpy (tr->dst.as_u8, ip1->dst_address.as_u8,
+ sizeof (tr->dst.as_u8));
+ tr->length = vlib_buffer_length_in_chain (vm, b1);
+ tr->next_index = next1;
+ tr->sr_valid = sr1 != 0;
+ if (tr->sr_valid)
+ clib_memcpy (tr->sr, sr1, sizeof (tr->sr));
+ }
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ ip6_header_t *ip0 = 0;
+ ip6_sr_header_t *sr0;
+ ip6_address_t *new_dst0;
+ u32 next0 = SR_LOCAL_NEXT_IP6_LOOKUP;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ ip0 = vlib_buffer_get_current (b0);
+ sr0 = (ip6_sr_header_t *) (ip0 + 1);
+
+ if (PREDICT_FALSE
+ (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
+ sr0 =
+ (ip6_sr_header_t *) ip6_ext_next_header ((ip6_ext_header_t *)
+ ext_hdr);
+ }
+ if (PREDICT_FALSE (sr0->type != ROUTING_HEADER_TYPE_SR))
+ {
+ next0 = SR_LOCAL_NEXT_ERROR;
+ b0->error =
+ node->errors[SR_LOCAL_ERROR_BAD_ROUTING_HEADER_TYPE];
+ goto do_trace;
+ }
+
+ /* Out of segments? Turf the packet */
+ if (PREDICT_FALSE (sr0->segments_left == 0))
+ {
+ next0 = SR_LOCAL_NEXT_ERROR;
+ b0->error = node->errors[SR_LOCAL_ERROR_NO_MORE_SEGMENTS];
+ goto do_trace;
+ }
+
+ if (PREDICT_FALSE (sm->validate_hmac))
+ {
+ if (sr_validate_hmac (sm, ip0, sr0))
+ {
+ next0 = SR_LOCAL_NEXT_ERROR;
+ b0->error = node->errors[SR_LOCAL_ERROR_HMAC_INVALID];
+ goto do_trace;
+ }
+ }
+
+ next0 = sr_local_cb ? sr_local_cb (vm, node, b0, ip0, sr0) : next0;
+
+ /*
+ * To suppress rewrite, return ~SR_LOCAL_NEXT_xxx
+ */
+ if (PREDICT_FALSE (next0 & 0x80000000))
+ {
+ next0 ^= 0xFFFFFFFF;
+ if (PREDICT_FALSE (next0 == SR_LOCAL_NEXT_ERROR))
+ b0->error = node->errors[SR_LOCAL_ERROR_APP_CALLBACK];
+ }
+ else
+ {
+ u32 segment_index0;
+
+ segment_index0 = sr0->segments_left - 1;
+
+ /* Rewrite the packet */
+ new_dst0 = (ip6_address_t *) (sr0->segments + segment_index0);
+ ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
+ ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
+
+ if (PREDICT_TRUE (sr0->segments_left > 0))
+ sr0->segments_left -= 1;
+ }
+
+ /* End of the path. Clean up the SR header, or not */
+ if (PREDICT_FALSE
+ (sr0->segments_left == 0 &&
+ (sr0->flags &
+ clib_host_to_net_u16 (IP6_SR_HEADER_FLAG_CLEANUP))))
+ {
+ u64 *copy_dst0, *copy_src0;
+ u16 new_l0;
+ u32 copy_len_u64s0 = 0;
+ int i;
+
+ /*
+ * Copy the ip6 header right by the (real) length of the
+ * sr header.
+ */
+ if (PREDICT_FALSE
+ (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
+ copy_len_u64s0 =
+ (((ip6_ext_header_t *) ext_hdr)->n_data_u64s) + 1;
+ ext_hdr->next_hdr = sr0->protocol;
+ }
+ else
+ {
+ ip0->protocol = sr0->protocol;
+ }
+
+ vlib_buffer_advance (b0, (sr0->length + 1) * 8);
+
+ new_l0 = clib_net_to_host_u16 (ip0->payload_length) -
+ (sr0->length + 1) * 8;
+ ip0->payload_length = clib_host_to_net_u16 (new_l0);
+
+ copy_src0 = (u64 *) ip0;
+ copy_dst0 = copy_src0 + (sr0->length + 1);
+ copy_dst0[4 + copy_len_u64s0] = copy_src0[4 + copy_len_u64s0];
+ copy_dst0[3 + copy_len_u64s0] = copy_src0[3 + copy_len_u64s0];
+ copy_dst0[2 + copy_len_u64s0] = copy_src0[2 + copy_len_u64s0];
+ copy_dst0[1 + copy_len_u64s0] = copy_src0[1 + copy_len_u64s0];
+ copy_dst0[0 + copy_len_u64s0] = copy_src0[0 + copy_len_u64s0];
+
+ for (i = copy_len_u64s0 - 1; i >= 0; i--)
+ {
+ copy_dst0[i] = copy_src0[i];
+ }
+
+ sr0 = 0;
+ }
+
+ do_trace:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_local_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
+ sizeof (tr->src.as_u8));
+ clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
+ sizeof (tr->dst.as_u8));
+ tr->length = vlib_buffer_length_in_chain (vm, b0);
+ tr->next_index = next0;
+ tr->sr_valid = sr0 != 0;
+ if (tr->sr_valid)
+ clib_memcpy (tr->sr, sr0, sizeof (tr->sr));
+ }
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ vlib_node_increment_counter (vm, sr_local_node.index,
+ SR_LOCAL_ERROR_PKTS_PROCESSED,
+ from_frame->n_vectors);
+ return from_frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (sr_local_node, static) = {
+ .function = sr_local,
+ .name = "sr-local",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .format_trace = format_sr_local_trace,
+
+ .runtime_data_bytes = 0,
+
+ .n_errors = SR_LOCAL_N_ERROR,
+ .error_strings = sr_local_error_strings,
+
+ .n_next_nodes = SR_LOCAL_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [SR_LOCAL_NEXT_##s] = n,
+ foreach_sr_local_next
+#undef _
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (sr_local_node, sr_local)
+/* *INDENT-ON* */
+
+ip6_sr_main_t *
+sr_get_main (vlib_main_t * vm)
+{
+ vlib_call_init_function (vm, sr_init);
+ ASSERT (sr_local_node.index);
+ return &sr_main;
+}
+
+/**
+ * @brief CLI parser for SR fix destination rewrite node
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+set_ip6_sr_rewrite_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP6,
+ .fp_len = 128,
+ };
+ u32 fib_index = 0;
+ u32 fib_id = 0;
+ u32 adj_index;
+ ip_adjacency_t *adj;
+ vnet_hw_interface_t *hi;
+ u32 sw_if_index;
+ ip6_sr_main_t *sm = &sr_main;
+ vnet_main_t *vnm = vnet_get_main ();
+ fib_node_index_t fei;
+
+ if (!unformat (input, "%U", unformat_ip6_address, &pfx.fp_addr.ip6))
+ return clib_error_return (0, "ip6 address missing in '%U'",
+ format_unformat_error, input);
+
+ if (unformat (input, "rx-table-id %d", &fib_id))
+ {
+ fib_index = fib_table_id_find_fib_index (FIB_PROTOCOL_IP6, fib_id);
+ if (fib_index == ~0)
+ return clib_error_return (0, "fib-id %d not found", fib_id);
+ }
+
+ fei = fib_table_lookup_exact_match (fib_index, &pfx);
+
+ if (FIB_NODE_INDEX_INVALID == fei)
+ return clib_error_return (0, "no match for %U",
+ format_ip6_address, &pfx.fp_addr.ip6);
+
+ adj_index = fib_entry_get_adj_for_source (fei, FIB_SOURCE_SR);
+
+ if (ADJ_INDEX_INVALID == adj_index)
+ return clib_error_return (0, "%U not SR sourced",
+ format_ip6_address, &pfx.fp_addr.ip6);
+
+ adj = adj_get (adj_index);
+
+ if (adj->lookup_next_index != IP_LOOKUP_NEXT_REWRITE)
+ return clib_error_return (0, "%U unresolved (not a rewrite adj)",
+ format_ip6_address, &pfx.fp_addr.ip6);
+
+ adj->rewrite_header.next_index = sm->ip6_rewrite_sr_next_index;
+
+ sw_if_index = adj->rewrite_header.sw_if_index;
+ hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ adj->rewrite_header.node_index = sr_fix_dst_addr_node.index;
+
+ /* $$$$$ hack... steal the mcast group index */
+ adj->mcast_group_index =
+ vlib_node_add_next (vm, sr_fix_dst_addr_node.index,
+ hi->output_node_index);
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (set_ip6_sr_rewrite, static) = {
+ .path = "set ip6 sr rewrite",
+ .short_help = "set ip6 sr rewrite <ip6-address> [fib-id <id>]",
+ .function = set_ip6_sr_rewrite_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief Register a callback routine to set next0 in sr_local
+ *
+ * @param cb void *
+ */
+void
+vnet_register_sr_app_callback (void *cb)
+{
+ ip6_sr_main_t *sm = &sr_main;
+
+ sm->sr_local_cb = cb;
+}
+
+/**
+ * @brief Test routine for validation of HMAC
+ */
+static clib_error_t *
+test_sr_hmac_validate_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ ip6_sr_main_t *sm = &sr_main;
+
+ if (unformat (input, "validate on"))
+ sm->validate_hmac = 1;
+ else if (unformat (input, "chunk-offset off"))
+ sm->validate_hmac = 0;
+ else
+ return clib_error_return (0, "expected validate on|off in '%U'",
+ format_unformat_error, input);
+
+ vlib_cli_output (vm, "hmac signature validation %s",
+ sm->validate_hmac ? "on" : "off");
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (test_sr_hmac_validate, static) = {
+ .path = "test sr hmac",
+ .short_help = "test sr hmac validate [on|off]",
+ .function = test_sr_hmac_validate_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief Add or Delete HMAC key
+ *
+ * @param sm ip6_sr_main_t *
+ * @param key_id u32
+ * @param shared_secret u8 *
+ * @param is_del u8
+ *
+ * @return retval i32
+ */
+// $$$ fixme shouldn't return i32
+i32
+sr_hmac_add_del_key (ip6_sr_main_t * sm, u32 key_id, u8 * shared_secret,
+ u8 is_del)
+{
+ u32 index;
+ ip6_sr_hmac_key_t *key;
+
+ if (is_del == 0)
+ {
+ /* Specific key in use? Fail. */
+ if (key_id && vec_len (sm->hmac_keys) > key_id
+ && sm->hmac_keys[key_id].shared_secret)
+ return -2;
+
+ index = key_id;
+ key = find_or_add_shared_secret (sm, shared_secret, &index);
+ ASSERT (index == key_id);
+ return 0;
+ }
+
+ /* delete */
+
+ if (key_id) /* delete by key ID */
+ {
+ if (vec_len (sm->hmac_keys) <= key_id)
+ return -3;
+
+ key = sm->hmac_keys + key_id;
+
+ hash_unset_mem (sm->hmac_key_by_shared_secret, key->shared_secret);
+ vec_free (key->shared_secret);
+ return 0;
+ }
+
+ index = 0;
+ key = find_or_add_shared_secret (sm, shared_secret, &index);
+ hash_unset_mem (sm->hmac_key_by_shared_secret, key->shared_secret);
+ vec_free (key->shared_secret);
+ return 0;
+}
+
+
+static clib_error_t *
+sr_hmac_add_del_key_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ ip6_sr_main_t *sm = &sr_main;
+ u8 is_del = 0;
+ u32 key_id = 0;
+ u8 key_id_set = 0;
+ u8 *shared_secret = 0;
+ i32 rv;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "del"))
+ is_del = 1;
+ else if (unformat (input, "id %d", &key_id))
+ key_id_set = 1;
+ else if (unformat (input, "key %s", &shared_secret))
+ {
+ /* Do not include the trailing NULL byte. Guaranteed interop issue */
+ _vec_len (shared_secret) -= 1;
+ }
+ else
+ break;
+ }
+
+ if (is_del == 0 && shared_secret == 0)
+ return clib_error_return (0, "shared secret must be set to add a key");
+
+ if (shared_secret == 0 && key_id_set == 0)
+ return clib_error_return (0, "shared secret and key id both unset");
+
+ rv = sr_hmac_add_del_key (sm, key_id, shared_secret, is_del);
+
+ vec_free (shared_secret);
+
+ switch (rv)
+ {
+ case 0:
+ break;
+
+ default:
+ return clib_error_return (0, "sr_hmac_add_del_key returned %d", rv);
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (sr_hmac, static) = {
+ .path = "sr hmac",
+ .short_help = "sr hmac [del] id <nn> key <str>",
+ .function = sr_hmac_add_del_key_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief CLI parser for show HMAC key shared secrets
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+show_sr_hmac_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ ip6_sr_main_t *sm = &sr_main;
+ int i;
+
+ for (i = 1; i < vec_len (sm->hmac_keys); i++)
+ {
+ if (sm->hmac_keys[i].shared_secret)
+ vlib_cli_output (vm, "[%d]: %v", i, sm->hmac_keys[i].shared_secret);
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_sr_hmac, static) = {
+ .path = "show sr hmac",
+ .short_help = "show sr hmac",
+ .function = show_sr_hmac_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief Test for SR debug flag
+ *
+ * @param vm vlib_main_t *
+ * @param input unformat_input_t *
+ * @param cmd vlib_cli_command_t *
+ *
+ * @return error clib_error_t *
+ */
+static clib_error_t *
+test_sr_debug_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ ip6_sr_main_t *sm = &sr_main;
+
+ if (unformat (input, "on"))
+ sm->is_debug = 1;
+ else if (unformat (input, "off"))
+ sm->is_debug = 0;
+ else
+ return clib_error_return (0, "expected on|off in '%U'",
+ format_unformat_error, input);
+
+ vlib_cli_output (vm, "debug trace now %s", sm->is_debug ? "on" : "off");
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (test_sr_debug, static) = {
+ .path = "test sr debug",
+ .short_help = "test sr debug on|off",
+ .function = test_sr_debug_fn,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */