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lcpng_if_node.c
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lcpng_if_node.c
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/*
* lcp_enthernet_node.c : linux control plane ethernet node
*
* Copyright (c) 2021 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 <sys/socket.h>
#include <linux/if.h>
#include <plugins/lcpng/lcpng_interface.h>
#include <plugins/lcpng/lcpng_adj.h>
#include <lcpng/lcpng_if.api_enum.h>
#include <vnet/feature/feature.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ethernet/arp_packet.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip_types.h>
#include <vnet/ip/lookup.h>
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip6.h>
#include <vnet/l2/l2_input.h>
#define foreach_lip_punt \
_ (IO, "punt to host") \
_ (DROP, "unknown input interface")
typedef enum
{
#define _(sym, str) LIP_PUNT_NEXT_##sym,
foreach_lip_punt
#undef _
LIP_PUNT_N_NEXT,
} lip_punt_next_t;
typedef struct lip_punt_trace_t_
{
u32 phy_sw_if_index;
u32 host_sw_if_index;
} lip_punt_trace_t;
/* packet trace format function */
static u8 *
format_lip_punt_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 *);
lip_punt_trace_t *t = va_arg (*args, lip_punt_trace_t *);
s =
format (s, "lip-punt: %u -> %u", t->phy_sw_if_index, t->host_sw_if_index);
return s;
}
/**
* Pass punted packets from the PHY to the HOST.
*/
VLIB_NODE_FN (lip_punt_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
u32 n_left_from, *from, *to_next, n_left_to_next;
lip_punt_next_t next_index;
next_index = node->cached_next_index;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *b0;
const lcp_itf_pair_t *lip0 = NULL;
u32 next0 = ~0;
u32 bi0, lipi0;
u32 sw_if_index0;
u8 len0;
bi0 = to_next[0] = from[0];
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
next0 = LIP_PUNT_NEXT_DROP;
b0 = vlib_get_buffer (vm, bi0);
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
lipi0 = lcp_itf_pair_find_by_phy (sw_if_index0);
if (PREDICT_FALSE (lipi0 == INDEX_INVALID))
goto trace0;
lip0 = lcp_itf_pair_get (lipi0);
next0 = LIP_PUNT_NEXT_IO;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = lip0->lip_host_sw_if_index;
if (PREDICT_TRUE (lip0->lip_host_type == LCP_ITF_HOST_TAP))
{
/*
* rewind to ethernet header
*/
len0 = ((u8 *) vlib_buffer_get_current (b0) -
(u8 *) ethernet_buffer_get_header (b0));
vlib_buffer_advance (b0, -len0);
}
/* Tun packets don't need any special treatment, just need to
* be escorted past the TTL decrement. If we still want to use
* ip[46]-punt-redirect with these, we could just set the
* VNET_BUFFER_F_LOCALLY_ORIGINATED in an 'else {}' here and
* then pass to the next node on the ip[46]-punt feature arc
*/
trace0:
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
lip_punt_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->phy_sw_if_index = sw_if_index0;
t->host_sw_if_index =
(lipi0 == INDEX_INVALID) ? ~0 : lip0->lip_host_sw_if_index;
}
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(lip_punt_node) = {
.name = "linux-cp-punt",
.vector_size = sizeof(u32),
.format_trace = format_lip_punt_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = LIP_PUNT_N_NEXT,
.next_nodes =
{
[LIP_PUNT_NEXT_DROP] = "error-drop",
[LIP_PUNT_NEXT_IO] = "interface-output",
},
};
#define foreach_lcp_punt_l3 _ (DROP, "unknown error")
typedef enum
{
#define _(sym, str) LCP_LOCAL_NEXT_##sym,
foreach_lcp_punt_l3
#undef _
LCP_LOCAL_N_NEXT,
} lcp_punt_l3_next_t;
typedef struct lcp_punt_l3_trace_t_
{
u32 phy_sw_if_index;
} lcp_punt_l3_trace_t;
/* packet trace format function */
static u8 *
format_lcp_punt_l3_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 *);
lcp_punt_l3_trace_t *t = va_arg (*args, lcp_punt_l3_trace_t *);
s = format (s, "linux-cp-punt-l3: %u", t->phy_sw_if_index);
return s;
}
VLIB_NODE_FN (lcp_punt_l3_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
u32 n_left_from, *from, *to_next, n_left_to_next;
lip_punt_next_t next_index;
next_index = node->cached_next_index;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *b0;
u32 next0 = LCP_LOCAL_NEXT_DROP;
u32 bi0;
index_t lipi0;
lcp_itf_pair_t *lip0;
bi0 = to_next[0] = from[0];
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
vnet_feature_next (&next0, b0);
lipi0 =
lcp_itf_pair_find_by_phy (vnet_buffer (b0)->sw_if_index[VLIB_RX]);
if (lipi0 != INDEX_INVALID)
{
/*
* Avoid TTL check for packets which arrived on a tunnel and
* are being punted to the local host.
*/
lip0 = lcp_itf_pair_get (lipi0);
if (lip0->lip_host_type == LCP_ITF_HOST_TUN)
b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
}
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
lcp_punt_l3_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->phy_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
}
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(lcp_punt_l3_node) = {
.name = "linux-cp-punt-l3",
.vector_size = sizeof(u32),
.format_trace = format_lcp_punt_l3_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = 1,
.next_nodes =
{
[LCP_LOCAL_NEXT_DROP] = "error-drop",
},
};
VNET_FEATURE_INIT (lcp_punt_l3_ip4, static) = {
.arc_name = "ip4-punt",
.node_name = "linux-cp-punt-l3",
.runs_before = VNET_FEATURES ("ip4-punt-redirect"),
};
VNET_FEATURE_INIT (lip_punt_l3_ip6, static) = {
.arc_name = "ip6-punt",
.node_name = "linux-cp-punt-l3",
.runs_before = VNET_FEATURES ("ip6-punt-redirect"),
};
#define foreach_lcp_xc \
_ (DROP, "drop") \
_ (XC_IP4, "x-connnect-ip4") \
_ (XC_IP6, "x-connnect-ip6")
typedef enum
{
#define _(sym, str) LCP_XC_NEXT_##sym,
foreach_lcp_xc
#undef _
LCP_XC_N_NEXT,
} lcp_xc_next_t;
typedef struct lcp_xc_trace_t_
{
u32 phy_sw_if_index;
adj_index_t adj_index;
} lcp_xc_trace_t;
/* packet trace format function */
static u8 *
format_lcp_xc_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 *);
lcp_xc_trace_t *t = va_arg (*args, lcp_xc_trace_t *);
s = format (s, "lcp-xc: itf:%d adj:%d", t->phy_sw_if_index, t->adj_index);
return s;
}
/**
* X-connect all packets from the HOST to the PHY.
*
* This runs in either the IP4 or IP6 path. The MAC rewrite on the received
* packet from the host is used as a key to find the adjacency used on the phy.
* This allows this code to start the feature arc on that adjacency.
* Consequently, all packet sent from the host are also subject to output
* features, which is symmetric w.r.t. to input features.
*/
static_always_inline u32
lcp_xc_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame,
ip_address_family_t af)
{
u32 n_left_from, *from, *to_next, n_left_to_next;
lcp_xc_next_t next_index;
ip_lookup_main_t *lm;
next_index = 0;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
if (AF_IP4 == af)
lm = &ip4_main.lookup_main;
else
lm = &ip6_main.lookup_main;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
const ethernet_header_t *eth;
const lcp_itf_pair_t *lip;
u32 next0, bi0, lipi, ai;
vlib_buffer_t *b0;
const ip_adjacency_t *adj;
bi0 = to_next[0] = from[0];
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
lipi =
lcp_itf_pair_find_by_host (vnet_buffer (b0)->sw_if_index[VLIB_RX]);
lip = lcp_itf_pair_get (lipi);
vnet_buffer (b0)->sw_if_index[VLIB_TX] = lip->lip_phy_sw_if_index;
vlib_buffer_advance (b0, -lip->lip_rewrite_len);
eth = vlib_buffer_get_current (b0);
ai = ADJ_INDEX_INVALID;
if (!ethernet_address_cast (eth->dst_address))
ai = lcp_adj_lkup ((u8 *) eth, lip->lip_rewrite_len,
vnet_buffer (b0)->sw_if_index[VLIB_TX]);
if (ai == ADJ_INDEX_INVALID)
ai = lip->lip_phy_adjs.adj_index[af];
adj = adj_get (ai);
vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
next0 = adj->rewrite_header.next_index;
vnet_buffer (b0)->ip.save_rewrite_length = lip->lip_rewrite_len;
if (PREDICT_FALSE (adj->rewrite_header.flags &
VNET_REWRITE_HAS_FEATURES))
vnet_feature_arc_start_w_cfg_index (
lm->output_feature_arc_index,
vnet_buffer (b0)->sw_if_index[VLIB_TX], &next0, b0,
adj->ia_cfg_index);
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
lcp_xc_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->phy_sw_if_index = lip->lip_phy_sw_if_index;
t->adj_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
}
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_NODE_FN (lcp_xc_ip4)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return (lcp_xc_inline (vm, node, frame, AF_IP4));
}
VLIB_NODE_FN (lcp_xc_ip6)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return (lcp_xc_inline (vm, node, frame, AF_IP6));
}
VLIB_REGISTER_NODE (lcp_xc_ip4) = { .name = "linux-cp-xc-ip4",
.vector_size = sizeof (u32),
.format_trace = format_lcp_xc_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "ip4-rewrite" };
VNET_FEATURE_INIT (lcp_xc_ip4_ucast_node, static) = {
.arc_name = "ip4-unicast",
.node_name = "linux-cp-xc-ip4",
};
VNET_FEATURE_INIT (lcp_xc_ip4_mcast_node, static) = {
.arc_name = "ip4-multicast",
.node_name = "linux-cp-xc-ip4",
};
VLIB_REGISTER_NODE (lcp_xc_ip6) = { .name = "linux-cp-xc-ip6",
.vector_size = sizeof (u32),
.format_trace = format_lcp_xc_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "ip6-rewrite" };
VNET_FEATURE_INIT (lcp_xc_ip6_ucast_node, static) = {
.arc_name = "ip6-unicast",
.node_name = "linux-cp-xc-ip6",
};
VNET_FEATURE_INIT (lcp_xc_ip6_mcast_node, static) = {
.arc_name = "ip6-multicast",
.node_name = "linux-cp-xc-ip6",
};
typedef enum
{
LCP_XC_MPLS_NEXT_DROP,
LCP_XC_MPLS_NEXT_IO,
LCP_XC_MPLS_N_NEXT,
} lcp_xc_mpls_next_t;
static_always_inline uword
lcp_xc_mpls_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame)
{
u32 n_left_from, *from, *to_next, n_left_to_next;
lcp_xc_next_t next_index;
next_index = 0;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
const ethernet_header_t *eth;
const lcp_itf_pair_t *lip;
u32 next0, bi0, lipi, ai;
vlib_buffer_t *b0;
// const ip_adjacency_t *adj;
bi0 = to_next[0] = from[0];
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
lipi =
lcp_itf_pair_find_by_host (vnet_buffer (b0)->sw_if_index[VLIB_RX]);
lip = lcp_itf_pair_get (lipi);
vnet_buffer (b0)->sw_if_index[VLIB_TX] = lip->lip_phy_sw_if_index;
vlib_buffer_advance (b0, -lip->lip_rewrite_len);
eth = vlib_buffer_get_current (b0);
ai = ADJ_INDEX_INVALID;
next0 = LCP_XC_MPLS_NEXT_DROP;
if (!ethernet_address_cast (eth->dst_address))
ai = lcp_adj_lkup ((u8 *) eth, lip->lip_rewrite_len,
vnet_buffer (b0)->sw_if_index[VLIB_TX]);
if (ai != ADJ_INDEX_INVALID)
{
vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
next0 = LCP_XC_MPLS_NEXT_IO;
}
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
lcp_xc_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->phy_sw_if_index = lip->lip_phy_sw_if_index;
t->adj_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
}
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_NODE_FN (lcp_xc_mpls)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return (lcp_xc_mpls_inline (vm, node, frame));
}
VLIB_REGISTER_NODE (
lcp_xc_mpls) = { .name = "linux-cp-xc-mpls",
.vector_size = sizeof (u32),
.format_trace = format_lcp_xc_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = LCP_XC_MPLS_N_NEXT,
.next_nodes = {
[LCP_XC_MPLS_NEXT_DROP] = "error-drop",
[LCP_XC_MPLS_NEXT_IO] = "interface-output",
} };
VNET_FEATURE_INIT (lcp_xc_mpls_node, static) = {
.arc_name = "mpls-input",
.node_name = "linux-cp-xc-mpls",
};
typedef enum
{
LCP_XC_L3_NEXT_XC,
LCP_XC_L3_NEXT_LOOKUP,
LCP_XC_L3_N_NEXT,
} lcp_xc_l3_next_t;
/**
* X-connect all packets from the HOST to the PHY on L3 interfaces
*
* There's only one adjacency that can be used on thises links.
*/
static_always_inline u32
lcp_xc_l3_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, ip_address_family_t af)
{
u32 n_left_from, *from, *to_next, n_left_to_next;
lcp_xc_next_t next_index;
vnet_main_t *vnm = vnet_get_main ();
next_index = 0;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *b0;
const lcp_itf_pair_t *lip;
u32 next0 = ~0;
u32 bi0, lipi;
bi0 = to_next[0] = from[0];
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
/* Flag buffers as locally originated. Otherwise their TTL will
* be checked & decremented. That would break services like BGP
* which set a TTL of 1 by default.
*/
b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
lipi =
lcp_itf_pair_find_by_host (vnet_buffer (b0)->sw_if_index[VLIB_RX]);
lip = lcp_itf_pair_get (lipi);
/* P2P tunnels can use generic adjacency */
if (PREDICT_TRUE (
vnet_sw_interface_is_p2p (vnm, lip->lip_phy_sw_if_index)))
{
vnet_buffer (b0)->sw_if_index[VLIB_TX] =
lip->lip_phy_sw_if_index;
vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
lip->lip_phy_adjs.adj_index[af];
next0 = LCP_XC_L3_NEXT_XC;
}
/* P2MP tunnels require a fib lookup to find the right adjacency */
else
{
/* lookup should use FIB table associated with phy interface */
vnet_buffer (b0)->sw_if_index[VLIB_RX] =
lip->lip_phy_sw_if_index;
next0 = LCP_XC_L3_NEXT_LOOKUP;
}
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
lcp_xc_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->phy_sw_if_index = lip->lip_phy_sw_if_index;
t->adj_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
}
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;
}
/**
* X-connect all packets from the HOST to the PHY.
*/
VLIB_NODE_FN (lcp_xc_l3_ip4_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return (lcp_xc_l3_inline (vm, node, frame, AF_IP4));
}
VLIB_NODE_FN (lcp_xc_l3_ip6_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return (lcp_xc_l3_inline (vm, node, frame, AF_IP6));
}
VLIB_REGISTER_NODE(lcp_xc_l3_ip4_node) = {
.name = "linux-cp-xc-l3-ip4",
.vector_size = sizeof(u32),
.format_trace = format_lcp_xc_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = LCP_XC_L3_N_NEXT,
.next_nodes =
{
[LCP_XC_L3_NEXT_XC] = "ip4-midchain",
[LCP_XC_L3_NEXT_LOOKUP] = "ip4-lookup",
},
};
VNET_FEATURE_INIT (lcp_xc_node_l3_ip4_unicast, static) = {
.arc_name = "ip4-unicast",
.node_name = "linux-cp-xc-l3-ip4",
};
VNET_FEATURE_INIT (lcp_xc_node_l3_ip4_multicaast, static) = {
.arc_name = "ip4-multicast",
.node_name = "linux-cp-xc-l3-ip4",
};
VLIB_REGISTER_NODE(lcp_xc_l3_ip6_node) = {
.name = "linux-cp-xc-l3-ip6",
.vector_size = sizeof(u32),
.format_trace = format_lcp_xc_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = LCP_XC_L3_N_NEXT,
.next_nodes =
{
[LCP_XC_L3_NEXT_XC] = "ip6-midchain",
[LCP_XC_L3_NEXT_LOOKUP] = "ip6-lookup",
},
};
VNET_FEATURE_INIT (lcp_xc_node_l3_ip6_unicast, static) = {
.arc_name = "ip6-unicast",
.node_name = "linux-cp-xc-l3-ip6",
};
VNET_FEATURE_INIT (lcp_xc_node_l3_ip6_multicast, static) = {
.arc_name = "ip6-multicast",
.node_name = "linux-cp-xc-l3-ip6",
};
#define foreach_lcp_arp \
_ (DROP, "error-drop") \
_ (IO, "interface-output")
typedef enum
{
#define _(sym, str) LCP_ARP_NEXT_##sym,
foreach_lcp_arp
#undef _
LCP_ARP_N_NEXT,
} lcp_arp_next_t;
typedef struct lcp_arp_trace_t_
{
u32 rx_sw_if_index;
u16 arp_opcode;
} lcp_arp_trace_t;
/* packet trace format function */
static u8 *
format_lcp_arp_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 *);
lcp_arp_trace_t *t = va_arg (*args, lcp_arp_trace_t *);
s = format (s, "rx-sw-if-index: %u opcode: %u", t->rx_sw_if_index,
t->arp_opcode);
return s;
}
/**
* punt ARP replies to the host
*/
VLIB_NODE_FN (lcp_arp_phy_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
u32 n_left_from, *from, *to_next, n_left_to_next;
lcp_arp_next_t next_index;
u32 reply_copies[VLIB_FRAME_SIZE];
u32 n_copies = 0;
next_index = node->cached_next_index;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 2 && n_left_to_next >= 2)
{
u32 next0, next1, bi0, bi1;
vlib_buffer_t *b0, *b1;
ethernet_arp_header_t *arp0, *arp1;
bi0 = to_next[0] = from[0];
bi1 = to_next[1] = from[1];
from += 2;
n_left_from -= 2;
to_next += 2;
n_left_to_next -= 2;
next0 = next1 = LCP_ARP_NEXT_DROP;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
arp0 = vlib_buffer_get_current (b0);
arp1 = vlib_buffer_get_current (b1);
vnet_feature_next (&next0, b0);
vnet_feature_next (&next1, b1);
/*
* Replies might need to be received by the host, so we
* make a copy of them.
*/
if (arp0->opcode == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
{
lcp_itf_pair_t *lip0 = 0;
u32 lipi0;
vlib_buffer_t *c0;
u8 len0;
lipi0 = lcp_itf_pair_find_by_phy (
vnet_buffer (b0)->sw_if_index[VLIB_RX]);
lip0 = lcp_itf_pair_get (lipi0);
if (lip0)
{
/*
* rewind to eth header, copy, advance back to current
*/
len0 = ((u8 *) vlib_buffer_get_current (b0) -
(u8 *) ethernet_buffer_get_header (b0));
vlib_buffer_advance (b0, -len0);
c0 = vlib_buffer_copy (vm, b0);
vlib_buffer_advance (b0, len0);
if (c0)
{
/* Send to the host */
vnet_buffer (c0)->sw_if_index[VLIB_TX] =
lip0->lip_host_sw_if_index;
reply_copies[n_copies++] =
vlib_get_buffer_index (vm, c0);
}
}
}
if (arp1->opcode == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
{
lcp_itf_pair_t *lip1 = 0;
u32 lipi1;
vlib_buffer_t *c1;
u8 len1;
lipi1 = lcp_itf_pair_find_by_phy (
vnet_buffer (b1)->sw_if_index[VLIB_RX]);
lip1 = lcp_itf_pair_get (lipi1);
if (lip1)
{
/*
* rewind to reveal the ethernet header
*/
len1 = ((u8 *) vlib_buffer_get_current (b1) -
(u8 *) ethernet_buffer_get_header (b1));
vlib_buffer_advance (b1, -len1);
c1 = vlib_buffer_copy (vm, b1);
vlib_buffer_advance (b1, len1);
if (c1)
{
/* Send to the host */
vnet_buffer (c1)->sw_if_index[VLIB_TX] =
lip1->lip_host_sw_if_index;
reply_copies[n_copies++] =
vlib_get_buffer_index (vm, c1);
}
}
}
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
lcp_arp_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
}
if (PREDICT_FALSE ((b1->flags & VLIB_BUFFER_IS_TRACED)))
{
lcp_arp_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t));
t->rx_sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_RX];
}
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 next0, bi0;
vlib_buffer_t *b0;
ethernet_arp_header_t *arp0;
u16 arp_opcode;
bi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
next0 = LCP_ARP_NEXT_DROP;
b0 = vlib_get_buffer (vm, bi0);
arp0 = vlib_buffer_get_current (b0);
vnet_feature_next (&next0, b0);
/*
* Replies might need to be received by the host, so we
* make a copy of them.
*/
arp_opcode = clib_host_to_net_u16 (arp0->opcode);
if (arp_opcode == ETHERNET_ARP_OPCODE_reply)
{
lcp_itf_pair_t *lip0 = 0;
vlib_buffer_t *c0;
u32 lipi0;
u8 len0;
lipi0 = lcp_itf_pair_find_by_phy (
vnet_buffer (b0)->sw_if_index[VLIB_RX]);
lip0 = lcp_itf_pair_get (lipi0);
if (lip0)
{
/*
* rewind to reveal the ethernet header
*/
len0 = ((u8 *) vlib_buffer_get_current (b0) -
(u8 *) ethernet_buffer_get_header (b0));
vlib_buffer_advance (b0, -len0);
c0 = vlib_buffer_copy (vm, b0);
vlib_buffer_advance (b0, len0);
if (c0)
{
/* Send to the host */
vnet_buffer (c0)->sw_if_index[VLIB_TX] =
lip0->lip_host_sw_if_index;
reply_copies[n_copies++] =
vlib_get_buffer_index (vm, c0);
}
}
}
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
lcp_arp_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
t->arp_opcode = arp_opcode;
}
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);
}
if (n_copies)
vlib_buffer_enqueue_to_single_next (vm, node, reply_copies,
LCP_ARP_NEXT_IO, n_copies);
return frame->n_vectors;
}
VLIB_REGISTER_NODE(lcp_arp_phy_node) = {
.name = "linux-cp-arp-phy",
.vector_size = sizeof(u32),
.format_trace = format_lcp_arp_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = LINUXCP_N_ERROR,
.error_counters = linuxcp_error_counters,
.n_next_nodes = LCP_ARP_N_NEXT,
.next_nodes =
{
[LCP_ARP_NEXT_DROP] = "error-drop",
[LCP_ARP_NEXT_IO] = "interface-output",
},
};
VNET_FEATURE_INIT (lcp_arp_phy_arp_feat, static) = {
.arc_name = "arp",
.node_name = "linux-cp-arp-phy",
.runs_before = VNET_FEATURES ("arp-reply"),
};
/**
* x-connect ARP packets from the host to the phy
*/
VLIB_NODE_FN (lcp_arp_host_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
u32 n_left_from, *from, *to_next, n_left_to_next;
lcp_arp_next_t next_index;
next_index = node->cached_next_index;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
const lcp_itf_pair_t *lip0;
lcp_arp_next_t next0;
vlib_buffer_t *b0;
u32 bi0, lipi0;
u8 len0;
bi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
next0 = LCP_ARP_NEXT_IO;
b0 = vlib_get_buffer (vm, bi0);
lipi0 =
lcp_itf_pair_find_by_host (vnet_buffer (b0)->sw_if_index[VLIB_RX]);
lip0 = lcp_itf_pair_get (lipi0);
/* Send to the phy */
vnet_buffer (b0)->sw_if_index[VLIB_TX] = lip0->lip_phy_sw_if_index;
len0 = ((u8 *) vlib_buffer_get_current (b0) -
(u8 *) ethernet_buffer_get_header (b0));
vlib_buffer_advance (b0, -len0);