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vpp/src/plugins/srv6-ad-flow/node.c
Francois Clad ed7c62a304 srv6-ad-flow: SRv6 Per-Flow Dynamic Proxy 
Type: feature
Change-Id: Ibfc412200ef5932fa40423075967df6d9156f3ed
Signed-off-by: Francois Clad <fclad@cisco.com>
2021-03-31 14:13:06 +00:00

1026 lines
28 KiB
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/*
* node.c
*
* Copyright (c) 2015 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#include <srv6-ad-flow/ad-flow.h>
/****************************** Packet tracing ******************************/
typedef struct
{
u32 localsid_index;
} srv6_ad_flow_localsid_trace_t;
typedef struct
{
u8 error;
ip6_address_t src, dst;
} srv6_ad_flow_rewrite_trace_t;
static u8 *
format_srv6_ad_flow_localsid_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 *);
srv6_ad_flow_localsid_trace_t *t =
va_arg (*args, srv6_ad_flow_localsid_trace_t *);
return format (s, "SRv6-AD-Flow-localsid: localsid_index %d",
t->localsid_index);
}
static u8 *
format_srv6_ad_flow_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 *);
srv6_ad_flow_rewrite_trace_t *t =
va_arg (*args, srv6_ad_flow_rewrite_trace_t *);
if (PREDICT_FALSE (t->error != 0))
{
return format (s, "SRv6-AD-Flow-rewrite: cache is empty");
}
return format (s, "SRv6-AD-Flow-rewrite: src %U dst %U", format_ip6_address,
&t->src, format_ip6_address, &t->dst);
}
/**************************** Nodes registration *****************************/
vlib_node_registration_t srv6_ad4_flow_rewrite_node;
vlib_node_registration_t srv6_ad6_flow_rewrite_node;
/****************************** Packet counters ******************************/
#define foreach_srv6_ad_flow_rewrite_counter \
_ (PROCESSED, "srv6-ad-flow rewritten packets") \
_ (NO_RW, "(Error) No header for rewriting.")
typedef enum
{
#define _(sym, str) SRV6_AD_FLOW_REWRITE_COUNTER_##sym,
foreach_srv6_ad_flow_rewrite_counter
#undef _
SRV6_AD_FLOW_REWRITE_N_COUNTERS,
} srv6_ad_flow_rewrite_counters;
static char *srv6_ad_flow_rewrite_counter_strings[] = {
#define _(sym, string) string,
foreach_srv6_ad_flow_rewrite_counter
#undef _
};
/******************************** Next nodes *********************************/
typedef enum
{
SRV6_AD_FLOW_LOCALSID_NEXT_ERROR,
SRV6_AD_FLOW_LOCALSID_NEXT_REWRITE4,
SRV6_AD_FLOW_LOCALSID_NEXT_REWRITE6,
SRV6_AD_FLOW_LOCALSID_NEXT_BYPASS,
SRV6_AD_FLOW_LOCALSID_NEXT_PUNT,
SRV6_AD_FLOW_LOCALSID_N_NEXT,
} srv6_ad_flow_localsid_next_t;
typedef enum
{
SRV6_AD_FLOW_REWRITE_NEXT_ERROR,
SRV6_AD_FLOW_REWRITE_NEXT_LOOKUP,
SRV6_AD_FLOW_REWRITE_N_NEXT,
} srv6_ad_flow_rewrite_next_t;
/***************************** Inline functions ******************************/
static_always_inline int
ad_flow_lru_insert (srv6_ad_flow_localsid_t *ls, srv6_ad_flow_entry_t *e,
f64 now)
{
dlist_elt_t *lru_list_elt;
pool_get (ls->lru_pool, lru_list_elt);
e->lru_index = lru_list_elt - ls->lru_pool;
clib_dlist_addtail (ls->lru_pool, ls->lru_head_index, e->lru_index);
lru_list_elt->value = e - ls->cache;
e->last_lru_update = now;
return 1;
}
always_inline void
ad_flow_entry_update_lru (srv6_ad_flow_localsid_t *ls, srv6_ad_flow_entry_t *e)
{
/* don't update too often - timeout is in magnitude of seconds anyway */
if (e->last_heard > e->last_lru_update + 1)
{
clib_dlist_remove (ls->lru_pool, e->lru_index);
clib_dlist_addtail (ls->lru_pool, ls->lru_head_index, e->lru_index);
e->last_lru_update = e->last_heard;
}
}
always_inline void
ad_flow_entry_delete (srv6_ad_flow_localsid_t *ls, srv6_ad_flow_entry_t *e,
int lru_delete)
{
clib_bihash_kv_40_8_t kv;
if (ls->inner_type == AD_TYPE_IP4)
{
kv.key[0] = ((u64) e->key.s_addr.ip4.as_u32 << 32) |
(u64) e->key.d_addr.ip4.as_u32;
kv.key[1] = ((u64) e->key.s_port << 16) | ((u64) e->key.d_port);
kv.key[2] = 0;
kv.key[3] = 0;
kv.key[4] = 0;
}
else
{
kv.key[0] = e->key.s_addr.ip6.as_u64[0];
kv.key[1] = e->key.s_addr.ip6.as_u64[1];
kv.key[2] = e->key.d_addr.ip6.as_u64[0];
kv.key[3] = e->key.d_addr.ip6.as_u64[1];
kv.key[4] = ((u64) e->key.s_port << 16) | ((u64) e->key.d_port);
}
clib_bihash_add_del_40_8 (&ls->ftable, &kv, 0);
vec_free (e->rw_data);
if (lru_delete)
{
clib_dlist_remove (ls->lru_pool, e->lru_index);
}
pool_put_index (ls->lru_pool, e->lru_index);
pool_put (ls->cache, e);
}
static_always_inline int
ad_flow_lru_free_one (srv6_ad_flow_localsid_t *ls, f64 now)
{
srv6_ad_flow_entry_t *e = NULL;
dlist_elt_t *oldest_elt;
f64 entry_timeout_time;
u32 oldest_index;
oldest_index = clib_dlist_remove_head (ls->lru_pool, ls->lru_head_index);
if (~0 != oldest_index)
{
oldest_elt = pool_elt_at_index (ls->lru_pool, oldest_index);
e = pool_elt_at_index (ls->cache, oldest_elt->value);
entry_timeout_time = e->last_heard + (f64) SRV6_AD_CACHE_TIMEOUT;
if (now >= entry_timeout_time)
{
ad_flow_entry_delete (ls, e, 0);
return 1;
}
else
{
clib_dlist_addhead (ls->lru_pool, ls->lru_head_index, oldest_index);
}
}
return 0;
}
static_always_inline srv6_ad_flow_entry_t *
ad_flow_entry_alloc (srv6_ad_flow_localsid_t *ls, f64 now)
{
srv6_ad_flow_entry_t *e;
ad_flow_lru_free_one (ls, now);
pool_get (ls->cache, e);
clib_memset (e, 0, sizeof *e);
ad_flow_lru_insert (ls, e, now);
return e;
}
always_inline u32
ad_flow_value_get_session_index (clib_bihash_kv_40_8_t *value)
{
return value->value & ~(u32) 0;
}
int
ad_flow_is_idle_entry_cb (clib_bihash_kv_40_8_t *kv, void *arg)
{
srv6_ad_is_idle_entry_ctx_t *ctx = arg;
srv6_ad_flow_entry_t *e;
u64 entry_timeout_time;
srv6_ad_flow_localsid_t *ls = ctx->ls;
e = pool_elt_at_index (ls->cache, ad_flow_value_get_session_index (kv));
entry_timeout_time = e->last_heard + (f64) SRV6_AD_CACHE_TIMEOUT;
if (ctx->now >= entry_timeout_time)
{
ad_flow_entry_delete (ls, e, 1);
return 1;
}
return 0;
}
/****************************** Local SID node *******************************/
/**
* @brief Function doing SRH processing for AD behavior
*/
static_always_inline int
end_ad_flow_walk_expect_first_hdr (vlib_main_t *vm, vlib_buffer_t *b,
ip6_ext_header_t *first_hdr,
u8 first_hdr_type, u8 expected_hdr_type,
u32 *encap_length, u8 **found_hdr)
{
if (PREDICT_TRUE (first_hdr_type == expected_hdr_type))
{
*found_hdr = (void *) first_hdr;
}
else
{
u8 ext_hdr_type = first_hdr_type;
ip6_ext_header_t *ext_hdr = first_hdr;
if (!ip6_ext_hdr (ext_hdr_type))
{
*found_hdr = NULL;
return -1;
}
u32 ext_hdr_length = ip6_ext_header_len (ext_hdr);
if (!vlib_object_within_buffer_data (vm, b, ext_hdr, ext_hdr_length))
{
*found_hdr = NULL;
return -2;
}
*encap_length += ext_hdr_length;
ext_hdr_type = ext_hdr->next_hdr;
while (ext_hdr_type != expected_hdr_type && ip6_ext_hdr (ext_hdr_type))
{
ext_hdr = ip6_ext_next_header (ext_hdr);
ext_hdr_length = ip6_ext_header_len (ext_hdr);
if (!vlib_object_within_buffer_data (vm, b, ext_hdr, ext_hdr_length))
{
*found_hdr = NULL;
return -2;
}
*encap_length += ext_hdr_length;
ext_hdr_type = ext_hdr->next_hdr;
}
if (ext_hdr_type != expected_hdr_type)
{
*found_hdr = NULL;
return -1;
}
*found_hdr = ip6_ext_next_header (ext_hdr);
}
return 0;
}
/**
* @brief Function doing SRH processing for per-flow AD behavior (IPv6 inner
* traffic)
*/
static_always_inline void
end_ad_flow_processing_v6 (vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip,
srv6_ad_flow_localsid_t *ls_mem, u32 *next,
vlib_combined_counter_main_t **cnt, u32 *cnt_idx,
f64 now)
{
ip6_sr_main_t *srm = &sr_main;
srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
ip6_address_t *new_dst;
u32 encap_length = sizeof (ip6_header_t);
ip6_sr_header_t *srh;
clib_bihash_40_8_t *h = &ls_mem->ftable;
ip6_header_t *ulh = NULL;
u16 src_port = 0, dst_port = 0;
srv6_ad_flow_entry_t *e = NULL;
clib_bihash_kv_40_8_t kv, value;
srv6_ad_is_idle_entry_ctx_t ctx;
/* Find SRH in the extension header chain */
end_ad_flow_walk_expect_first_hdr (vm, b, (void *) (ip + 1), ip->protocol,
IP_PROTOCOL_IPV6_ROUTE, &encap_length,
(u8 **) &srh);
/* Punt the packet if no SRH or SRH with SL = 0 */
if (PREDICT_FALSE (srh == NULL || srh->type != ROUTING_HEADER_TYPE_SR ||
srh->segments_left == 0))
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_PUNT;
*cnt = &(sm->sid_punt_counters);
*cnt_idx = ls_mem->index;
return;
}
/* Decrement Segments Left and update Destination Address */
srh->segments_left -= 1;
new_dst = (ip6_address_t *) (srh->segments) + srh->segments_left;
ip->dst_address.as_u64[0] = new_dst->as_u64[0];
ip->dst_address.as_u64[1] = new_dst->as_u64[1];
/* Compute the total encapsulation size and determine ULH type */
encap_length += ip6_ext_header_len ((ip6_ext_header_t *) srh);
/* Find the inner IPv6 header (ULH) */
int ret = end_ad_flow_walk_expect_first_hdr (
vm, b, ip6_ext_next_header ((ip6_ext_header_t *) srh), srh->protocol,
IP_PROTOCOL_IPV6, &encap_length, (u8 **) &ulh);
if (PREDICT_FALSE (ulh == NULL))
{
if (ret == -1) /* Bypass the NF if ULH is not of expected type */
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_BYPASS;
*cnt = &(sm->sid_bypass_counters);
*cnt_idx = ls_mem->index;
}
else
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_ERROR;
*cnt = &(srm->sr_ls_invalid_counters);
}
return;
}
/* Compute flow hash on ULH */
if (PREDICT_TRUE (ulh->protocol == IP_PROTOCOL_UDP ||
ulh->protocol == IP_PROTOCOL_TCP))
{
udp_header_t *ulh_l4_hdr = (udp_header_t *) (ulh + 1);
src_port = ulh_l4_hdr->src_port;
dst_port = ulh_l4_hdr->dst_port;
}
kv.key[0] = ulh->src_address.as_u64[0];
kv.key[1] = ulh->src_address.as_u64[1];
kv.key[2] = ulh->dst_address.as_u64[0];
kv.key[3] = ulh->dst_address.as_u64[1];
kv.key[4] = ((u64) src_port << 16) | ((u64) dst_port);
/* Lookup flow in hashtable */
if (!clib_bihash_search_40_8 (h, &kv, &value))
{
e = pool_elt_at_index (ls_mem->cache,
ad_flow_value_get_session_index (&value));
}
if (!e)
{
if (pool_elts (ls_mem->cache) >= ls_mem->cache_size)
{
if (!ad_flow_lru_free_one (ls_mem, now))
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_ERROR;
*cnt = &(sm->sid_cache_full_counters);
*cnt_idx = ls_mem->index;
return;
}
}
e = ad_flow_entry_alloc (ls_mem, now);
ASSERT (e);
e->key.s_addr.ip6.as_u64[0] = ulh->src_address.as_u64[0];
e->key.s_addr.ip6.as_u64[1] = ulh->src_address.as_u64[1];
e->key.d_addr.ip6.as_u64[0] = ulh->dst_address.as_u64[0];
e->key.d_addr.ip6.as_u64[1] = ulh->dst_address.as_u64[1];
e->key.s_port = src_port;
e->key.d_port = dst_port;
e->key.proto = ulh->protocol;
kv.value = (u64) (e - ls_mem->cache);
ctx.now = now;
ctx.ls = ls_mem;
clib_bihash_add_or_overwrite_stale_40_8 (h, &kv,
ad_flow_is_idle_entry_cb, &ctx);
}
e->last_heard = now;
/* Cache encapsulation headers */
if (PREDICT_FALSE (encap_length > e->rw_len))
{
vec_validate (e->rw_data, encap_length - 1);
}
clib_memcpy_fast (e->rw_data, ip, encap_length);
e->rw_len = encap_length;
/* Update LRU */
ad_flow_entry_update_lru (ls_mem, e);
/* Decapsulate the packet */
vlib_buffer_advance (b, encap_length);
/* Set next node */
*next = SRV6_AD_FLOW_LOCALSID_NEXT_REWRITE6;
/* Set Xconnect adjacency to VNF */
vnet_buffer (b)->ip.adj_index[VLIB_TX] = ls_mem->nh_adj;
}
static_always_inline void
end_ad_flow_processing_v4 (vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip,
srv6_ad_flow_localsid_t *ls_mem, u32 *next,
vlib_combined_counter_main_t **cnt, u32 *cnt_idx,
f64 now)
{
ip6_sr_main_t *srm = &sr_main;
srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
ip6_address_t *new_dst;
u32 encap_length = sizeof (ip6_header_t);
ip6_sr_header_t *srh;
clib_bihash_40_8_t *h = &ls_mem->ftable;
ip4_header_t *ulh = NULL;
u16 src_port = 0, dst_port = 0;
srv6_ad_flow_entry_t *e = NULL;
clib_bihash_kv_40_8_t kv, value;
srv6_ad_is_idle_entry_ctx_t ctx;
/* Find SRH in the extension header chain */
end_ad_flow_walk_expect_first_hdr (vm, b, (void *) (ip + 1), ip->protocol,
IP_PROTOCOL_IPV6_ROUTE, &encap_length,
(u8 **) &srh);
/* Punt the packet if no SRH or SRH with SL = 0 */
if (PREDICT_FALSE (srh == NULL || srh->type != ROUTING_HEADER_TYPE_SR ||
srh->segments_left == 0))
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_PUNT;
*cnt = &(sm->sid_punt_counters);
*cnt_idx = ls_mem->index;
return;
}
/* Decrement Segments Left and update Destination Address */
srh->segments_left -= 1;
new_dst = (ip6_address_t *) (srh->segments) + srh->segments_left;
ip->dst_address.as_u64[0] = new_dst->as_u64[0];
ip->dst_address.as_u64[1] = new_dst->as_u64[1];
/* Add SRH length to the total encapsulation size */
encap_length += ip6_ext_header_len ((ip6_ext_header_t *) srh);
/* Find the inner IPv6 header (ULH) */
int ret = end_ad_flow_walk_expect_first_hdr (
vm, b, ip6_ext_next_header ((ip6_ext_header_t *) srh), srh->protocol,
IP_PROTOCOL_IP_IN_IP, &encap_length, (u8 **) &ulh);
if (PREDICT_FALSE (ulh == NULL))
{
if (ret == -1) /* Bypass the NF if ULH is not of expected type */
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_BYPASS;
*cnt = &(sm->sid_bypass_counters);
*cnt_idx = ls_mem->index;
}
else
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_ERROR;
*cnt = &(srm->sr_ls_invalid_counters);
}
return;
}
/* Compute flow hash on ULH */
if (PREDICT_TRUE (ulh->protocol == IP_PROTOCOL_UDP ||
ulh->protocol == IP_PROTOCOL_TCP))
{
udp_header_t *ulh_l4_hdr = (udp_header_t *) (ulh + 1);
src_port = ulh_l4_hdr->src_port;
dst_port = ulh_l4_hdr->dst_port;
}
kv.key[0] = *((u64 *) &ulh->address_pair);
kv.key[1] = ((u64) src_port << 16) | ((u64) dst_port);
kv.key[2] = 0;
kv.key[3] = 0;
kv.key[4] = 0;
/* Lookup flow in hashtable */
if (!clib_bihash_search_40_8 (h, &kv, &value))
{
e = pool_elt_at_index (ls_mem->cache,
ad_flow_value_get_session_index (&value));
}
if (!e)
{
if (pool_elts (ls_mem->cache) >= ls_mem->cache_size)
{
if (!ad_flow_lru_free_one (ls_mem, now))
{
*next = SRV6_AD_FLOW_LOCALSID_NEXT_ERROR;
*cnt = &(sm->sid_cache_full_counters);
*cnt_idx = ls_mem->index;
return;
}
}
e = ad_flow_entry_alloc (ls_mem, now);
ASSERT (e);
e->key.s_addr.ip4 = ulh->src_address;
e->key.d_addr.ip4 = ulh->dst_address;
e->key.s_port = src_port;
e->key.d_port = dst_port;
e->key.proto = ulh->protocol;
kv.value = (u64) (e - ls_mem->cache);
ctx.now = now;
ctx.ls = ls_mem;
clib_bihash_add_or_overwrite_stale_40_8 (h, &kv,
ad_flow_is_idle_entry_cb, &ctx);
}
e->last_heard = now;
/* Cache encapsulation headers */
if (PREDICT_FALSE (encap_length > e->rw_len))
{
vec_validate (e->rw_data, encap_length - 1);
}
clib_memcpy_fast (e->rw_data, ip, encap_length);
e->rw_len = encap_length;
/* Update LRU */
ad_flow_entry_update_lru (ls_mem, e);
/* Decapsulate the packet */
vlib_buffer_advance (b, encap_length);
/* Set next node */
*next = SRV6_AD_FLOW_LOCALSID_NEXT_REWRITE4;
/* Set Xconnect adjacency to VNF */
vnet_buffer (b)->ip.adj_index[VLIB_TX] = ls_mem->nh_adj;
}
/**
* @brief SRv6 AD Localsid graph node
*/
static uword
srv6_ad_flow_localsid_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame)
{
ip6_sr_main_t *srm = &sr_main;
f64 now = vlib_time_now (vm);
u32 n_left_from, next_index, *from, *to_next, n_left_to_next;
u32 thread_index = vm->thread_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
/* TODO: Dual/quad loop */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
ip6_header_t *ip0 = 0;
ip6_sr_localsid_t *ls0;
srv6_ad_flow_localsid_t *ls_mem0;
u32 next0;
vlib_combined_counter_main_t *cnt0 = &(srm->sr_ls_valid_counters);
u32 cnt_idx0;
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);
/* Retrieve local SID context based on IP DA (adj) */
ls0 = pool_elt_at_index (srm->localsids,
vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
cnt_idx0 = ls0 - srm->localsids;
/* Retrieve local SID's plugin memory */
ls_mem0 = ls0->plugin_mem;
/* SRH processing */
if (ls_mem0->inner_type == AD_TYPE_IP6)
end_ad_flow_processing_v6 (vm, b0, ip0, ls_mem0, &next0, &cnt0,
&cnt_idx0, now);
else
end_ad_flow_processing_v4 (vm, b0, ip0, ls_mem0, &next0, &cnt0,
&cnt_idx0, now);
/* Trace packet (if enabled) */
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
srv6_ad_flow_localsid_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof *tr);
tr->localsid_index = ls_mem0->index;
}
/* Increment the appropriate per-SID counter */
vlib_increment_combined_counter (
cnt0, thread_index, cnt_idx0, 1,
vlib_buffer_length_in_chain (vm, b0));
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 frame->n_vectors;
}
VLIB_REGISTER_NODE (srv6_ad_flow_localsid_node) = {
.function = srv6_ad_flow_localsid_fn,
.name = "srv6-ad-flow-localsid",
.vector_size = sizeof (u32),
.format_trace = format_srv6_ad_flow_localsid_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = SRV6_AD_FLOW_LOCALSID_N_NEXT,
.next_nodes = {
[SRV6_AD_FLOW_LOCALSID_NEXT_PUNT] = "ip6-local",
[SRV6_AD_FLOW_LOCALSID_NEXT_BYPASS] = "ip6-lookup",
[SRV6_AD_FLOW_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
[SRV6_AD_FLOW_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
[SRV6_AD_FLOW_LOCALSID_NEXT_ERROR] = "error-drop",
},
};
/****************************** Rewriting node *******************************/
/**
* @brief Graph node for applying a SR policy into an IPv6 packet.
* Encapsulation
*/
static uword
srv6_ad4_flow_rewrite_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame)
{
ip6_sr_main_t *srm = &sr_main;
srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
u32 n_left_from, next_index, *from, *to_next;
u32 cnt_packets = 0;
from = vlib_frame_vector_args (frame);
n_left_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);
/* TODO: Dual/quad loop */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
ip4_header_t *ip0_encap = 0;
ip6_header_t *ip0 = 0;
ip6_sr_localsid_t *ls0;
srv6_ad_flow_localsid_t *ls0_mem;
srv6_ad_flow_entry_t *s0;
u32 next0 = SRV6_AD_FLOW_REWRITE_NEXT_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);
ip0_encap = vlib_buffer_get_current (b0);
ls0 = pool_elt_at_index (
srm->localsids,
sm->sw_iface_localsid4[vnet_buffer (b0)->sw_if_index[VLIB_RX]]);
ls0_mem = ls0->plugin_mem;
if (PREDICT_FALSE (ls0_mem == NULL))
{
next0 = SRV6_AD_FLOW_REWRITE_NEXT_ERROR;
b0->error = node->errors[SRV6_AD_FLOW_REWRITE_COUNTER_NO_RW];
}
else
{
clib_bihash_kv_40_8_t kv0, value0;
/* Compute flow hash */
u64 ports = 0;
if (PREDICT_TRUE (ip0_encap->protocol == IP_PROTOCOL_UDP ||
ip0_encap->protocol == IP_PROTOCOL_TCP))
{
udp_header_t *udp0 = (udp_header_t *) (ip0_encap + 1);
ports =
((u64) udp0->src_port << 16) | ((u64) udp0->dst_port);
}
kv0.key[0] = *((u64 *) &ip0_encap->address_pair);
kv0.key[1] = ports;
kv0.key[2] = 0;
kv0.key[3] = 0;
kv0.key[4] = 0;
/* Lookup flow in hashtable */
if (clib_bihash_search_40_8 (&ls0_mem->ftable, &kv0, &value0) <
0)
{
/* not found */
next0 = SRV6_AD_FLOW_REWRITE_NEXT_ERROR;
b0->error = node->errors[SRV6_AD_FLOW_REWRITE_COUNTER_NO_RW];
}
else
{
/* found */
s0 = pool_elt_at_index (
ls0_mem->cache, ad_flow_value_get_session_index (&value0));
ASSERT (s0);
ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
(s0->rw_len + b0->current_data));
clib_memcpy_fast (((u8 *) ip0_encap) - s0->rw_len,
s0->rw_data, s0->rw_len);
vlib_buffer_advance (b0, -(word) s0->rw_len);
ip0 = vlib_buffer_get_current (b0);
/* Update inner IPv4 TTL and checksum */
u32 checksum0;
ip0_encap->ttl -= 1;
checksum0 =
ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
checksum0 += checksum0 >= 0xffff;
ip0_encap->checksum = checksum0;
/* Update outer IPv6 length (in case it has changed) */
new_l0 = s0->rw_len - sizeof (ip6_header_t) +
clib_net_to_host_u16 (ip0_encap->length);
ip0->payload_length = clib_host_to_net_u16 (new_l0);
}
}
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
srv6_ad_flow_rewrite_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof *tr);
tr->error = 0;
if (next0 == SRV6_AD_FLOW_REWRITE_NEXT_ERROR)
{
tr->error = 1;
}
else
{
clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
sizeof tr->src.as_u8);
clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
sizeof tr->dst.as_u8);
}
}
/* Increment per-SID AD rewrite counters */
vlib_increment_combined_counter (
((next0 == SRV6_AD_FLOW_REWRITE_NEXT_ERROR) ?
&(sm->rw_invalid_counters) :
&(sm->rw_valid_counters)),
vm->thread_index, ls0_mem->index, 1,
vlib_buffer_length_in_chain (vm, b0));
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
cnt_packets++;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Update counters */
vlib_node_increment_counter (vm, srv6_ad4_flow_rewrite_node.index,
SRV6_AD_FLOW_REWRITE_COUNTER_PROCESSED,
cnt_packets);
return frame->n_vectors;
}
VLIB_REGISTER_NODE (srv6_ad4_flow_rewrite_node) = {
.function = srv6_ad4_flow_rewrite_fn,
.name = "srv6-ad4-flow-rewrite",
.vector_size = sizeof (u32),
.format_trace = format_srv6_ad_flow_rewrite_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = SRV6_AD_FLOW_REWRITE_N_COUNTERS,
.error_strings = srv6_ad_flow_rewrite_counter_strings,
.n_next_nodes = SRV6_AD_FLOW_REWRITE_N_NEXT,
.next_nodes = {
[SRV6_AD_FLOW_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
[SRV6_AD_FLOW_REWRITE_NEXT_ERROR] = "error-drop",
},
};
/**
* @brief Graph node for applying a SR policy into an IPv6 packet.
* Encapsulation
*/
static uword
srv6_ad6_flow_rewrite_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame)
{
ip6_sr_main_t *srm = &sr_main;
srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
u32 n_left_from, next_index, *from, *to_next;
u32 cnt_packets = 0;
from = vlib_frame_vector_args (frame);
n_left_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);
/* TODO: Dual/quad loop */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
ip6_header_t *ip0 = 0, *ip0_encap = 0;
ip6_sr_localsid_t *ls0;
srv6_ad_flow_localsid_t *ls0_mem;
srv6_ad_flow_entry_t *s0;
u32 next0 = SRV6_AD_FLOW_REWRITE_NEXT_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);
ip0_encap = vlib_buffer_get_current (b0);
ls0 = pool_elt_at_index (
srm->localsids,
sm->sw_iface_localsid6[vnet_buffer (b0)->sw_if_index[VLIB_RX]]);
ls0_mem = ls0->plugin_mem;
if (PREDICT_FALSE (ls0_mem == NULL))
{
next0 = SRV6_AD_FLOW_REWRITE_NEXT_ERROR;
b0->error = node->errors[SRV6_AD_FLOW_REWRITE_COUNTER_NO_RW];
}
else
{
/* ############################################# */
clib_bihash_kv_40_8_t kv0, value0;
/* Compute flow hash */
u64 ports = 0;
if (PREDICT_TRUE (ip0_encap->protocol == IP_PROTOCOL_UDP ||
ip0_encap->protocol == IP_PROTOCOL_TCP))
{
udp_header_t *udp0 = (udp_header_t *) (ip0_encap + 1);
ports =
((u64) udp0->src_port << 16) | ((u64) udp0->dst_port);
}
kv0.key[0] = ip0_encap->src_address.as_u64[0];
kv0.key[1] = ip0_encap->src_address.as_u64[1];
kv0.key[2] = ip0_encap->dst_address.as_u64[0];
kv0.key[3] = ip0_encap->dst_address.as_u64[1];
kv0.key[4] = ports;
/* Lookup flow in hashtable */
if (clib_bihash_search_40_8 (&ls0_mem->ftable, &kv0, &value0))
{
/* not found */
next0 = SRV6_AD_FLOW_REWRITE_NEXT_ERROR;
b0->error = node->errors[SRV6_AD_FLOW_REWRITE_COUNTER_NO_RW];
}
else
{
/* found */
s0 = pool_elt_at_index (
ls0_mem->cache, ad_flow_value_get_session_index (&value0));
ASSERT (s0);
ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
(s0->rw_len + b0->current_data));
clib_memcpy_fast (((u8 *) ip0_encap) - s0->rw_len,
s0->rw_data, s0->rw_len);
vlib_buffer_advance (b0, -(word) s0->rw_len);
ip0 = vlib_buffer_get_current (b0);
/* Update inner IPv6 hop limit */
ip0_encap->hop_limit -= 1;
/* Update outer IPv6 length (in case it has changed) */
new_l0 = s0->rw_len +
clib_net_to_host_u16 (ip0_encap->payload_length);
ip0->payload_length = clib_host_to_net_u16 (new_l0);
}
}
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
srv6_ad_flow_rewrite_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof *tr);
tr->error = 0;
if (next0 == SRV6_AD_FLOW_REWRITE_NEXT_ERROR)
{
tr->error = 1;
}
else
{
clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
sizeof tr->src.as_u8);
clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
sizeof tr->dst.as_u8);
}
}
/* Increment per-SID AD rewrite counters */
vlib_increment_combined_counter (
((next0 == SRV6_AD_FLOW_REWRITE_NEXT_ERROR) ?
&(sm->rw_invalid_counters) :
&(sm->rw_valid_counters)),
vm->thread_index, ls0_mem->index, 1,
vlib_buffer_length_in_chain (vm, b0));
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
cnt_packets++;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Update counters */
vlib_node_increment_counter (vm, srv6_ad6_flow_rewrite_node.index,
SRV6_AD_FLOW_REWRITE_COUNTER_PROCESSED,
cnt_packets);
return frame->n_vectors;
}
VLIB_REGISTER_NODE (srv6_ad6_flow_rewrite_node) = {
.function = srv6_ad6_flow_rewrite_fn,
.name = "srv6-ad6-flow-rewrite",
.vector_size = sizeof (u32),
.format_trace = format_srv6_ad_flow_rewrite_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = SRV6_AD_FLOW_REWRITE_N_COUNTERS,
.error_strings = srv6_ad_flow_rewrite_counter_strings,
.n_next_nodes = SRV6_AD_FLOW_REWRITE_N_NEXT,
.next_nodes = {
[SRV6_AD_FLOW_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
[SRV6_AD_FLOW_REWRITE_NEXT_ERROR] = "error-drop",
},
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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