https://github.com/cilium/cilium
Tip revision: a09e05e6b63d82dbc3a1b0de1721a3407c340e7c authored by Michi Mutsuzaki on 08 June 2024, 21:31:01 UTC
Prepare for release v1.15.6
Prepare for release v1.15.6
Tip revision: a09e05e
tc_nodeport_lb6_dsr_backend.c
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright Authors of Cilium */
#include "common.h"
#include <bpf/ctx/skb.h>
#include "pktgen.h"
/* Set ETH_HLEN to 14 to indicate that the packet has a 14 byte ethernet header */
#define ETH_HLEN 14
/* Enable code paths under test */
#define ENABLE_IPV6
#define ENABLE_NODEPORT
#define ENABLE_DSR 1
#define DSR_ENCAP_GENEVE 3
#define ENABLE_HOST_ROUTING
#define DISABLE_LOOPBACK_LB
#define ENABLE_SKIP_FIB 1
/* Skip ingress policy checks, not needed to validate hairpin flow */
#define USE_BPF_PROG_FOR_INGRESS_POLICY
#undef FORCE_LOCAL_POLICY_EVAL_AT_SOURCE
#define CLIENT_IP { .addr = { 0x1, 0x0, 0x0, 0x0, 0x0, 0x0 } }
#define CLIENT_PORT __bpf_htons(111)
#define FRONTEND_IP { .addr = { 0x2, 0x0, 0x0, 0x0, 0x0, 0x0 } }
#define FRONTEND_PORT tcp_svc_one
#define BACKEND_IP { .addr = { 0x3, 0x0, 0x0, 0x0, 0x0, 0x0 } }
#define BACKEND_PORT __bpf_htons(8080)
static volatile const __u8 *client_mac = mac_one;
static volatile const __u8 *node_mac = mac_three;
static volatile const __u8 *backend_mac = mac_four;
#define SECCTX_FROM_IPCACHE 1
#include "bpf_host.c"
#include "lib/endpoint.h"
#include "lib/ipcache.h"
#define FROM_NETDEV 0
#define TO_NETDEV 1
struct {
__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
__uint(key_size, sizeof(__u32));
__uint(max_entries, 2);
__array(values, int());
} entry_call_map __section(".maps") = {
.values = {
[FROM_NETDEV] = &cil_from_netdev,
[TO_NETDEV] = &cil_to_netdev,
},
};
/* Test that a remote node
* - doesn't touch a DSR request,
* - redirects it to the pod (as ENABLE_HOST_ROUTING is set)
* - creates a matching CT entry, and SNAT entry from the DSR info
*/
PKTGEN("tc", "tc_nodeport_dsr_backend")
int nodeport_dsr_backend_pktgen(struct __ctx_buff *ctx)
{
union v6addr frontend_ip = FRONTEND_IP;
union v6addr backend_ip = BACKEND_IP;
union v6addr client_ip = CLIENT_IP;
struct dsr_opt_v6 *opt;
struct pktgen builder;
struct ipv6hdr *l3;
struct tcphdr *l4;
struct ethhdr *l2;
void *data;
/* Init packet builder */
pktgen__init(&builder, ctx);
/* Push ethernet header */
l2 = pktgen__push_ethhdr(&builder);
if (!l2)
return TEST_ERROR;
ethhdr__set_macs(l2, (__u8 *)client_mac, (__u8 *)node_mac);
/* Push IPv6 header and DSR extension */
l3 = pktgen__push_default_ipv6hdr(&builder);
if (!l3)
return TEST_ERROR;
ipv6_addr_copy((union v6addr *)&l3->saddr, &client_ip);
ipv6_addr_copy((union v6addr *)&l3->daddr, &backend_ip);
opt = (struct dsr_opt_v6 *)pktgen__append_ipv6_extension_header(&builder,
NEXTHDR_DEST,
sizeof(*opt));
if (!opt)
return TEST_ERROR;
opt->opt_type = DSR_IPV6_OPT_TYPE;
opt->opt_len = DSR_IPV6_OPT_LEN;
ipv6_addr_copy((union v6addr *)&opt->addr, &frontend_ip);
opt->port = FRONTEND_PORT;
/* Push TCP header */
l4 = pktgen__push_default_tcphdr(&builder);
if (!l4)
return TEST_ERROR;
l4->source = CLIENT_PORT;
l4->dest = BACKEND_PORT;
data = pktgen__push_data(&builder, default_data, sizeof(default_data));
if (!data)
return TEST_ERROR;
/* Calc lengths, set protocol fields and calc checksums */
pktgen__finish(&builder);
return 0;
}
SETUP("tc", "tc_nodeport_dsr_backend")
int nodeport_dsr_backend_setup(struct __ctx_buff *ctx)
{
union v6addr backend_ip = BACKEND_IP;
/* add local backend */
endpoint_v6_add_entry(&backend_ip, 0, 0, 0,
(__u8 *)backend_mac, (__u8 *)node_mac);
ipcache_v6_add_entry(&backend_ip, 0, 112233, 0, 0);
/* Jump into the entrypoint */
tail_call_static(ctx, entry_call_map, FROM_NETDEV);
/* Fail if we didn't jump */
return TEST_ERROR;
}
CHECK("tc", "tc_nodeport_dsr_backend")
int nodeport_dsr_backend_check(struct __ctx_buff *ctx)
{
union v6addr frontend_ip = FRONTEND_IP;
union v6addr backend_ip = BACKEND_IP;
union v6addr client_ip = CLIENT_IP;
struct dsr_opt_v6 *opt;
void *data, *data_end;
__u32 *status_code;
struct ipv6hdr *l3;
struct tcphdr *l4;
struct ethhdr *l2;
test_init();
data = (void *)(long)ctx_data(ctx);
data_end = (void *)(long)ctx->data_end;
if (data + sizeof(__u32) > data_end)
test_fatal("status code out of bounds");
status_code = data;
assert(*status_code == CTX_ACT_REDIRECT);
l2 = data + sizeof(__u32);
if ((void *)l2 + sizeof(struct ethhdr) > data_end)
test_fatal("l2 out of bounds");
l3 = (void *)l2 + sizeof(struct ethhdr);
if ((void *)l3 + sizeof(struct ipv6hdr) > data_end)
test_fatal("l3 out of bounds");
opt = (void *)l3 + sizeof(struct ipv6hdr);
if ((void *)opt + sizeof(*opt) > data_end)
test_fatal("l3 DSR option out of bounds");
l4 = (void *)opt + sizeof(*opt);
if ((void *)l4 + sizeof(struct tcphdr) > data_end)
test_fatal("l4 out of bounds");
if (memcmp(l2->h_source, (__u8 *)node_mac, ETH_ALEN) != 0)
test_fatal("src MAC is not the node MAC")
if (memcmp(l2->h_dest, (__u8 *)backend_mac, ETH_ALEN) != 0)
test_fatal("dst MAC is not the endpoint MAC")
if (!ipv6_addr_equals((union v6addr *)&l3->saddr, &client_ip))
test_fatal("src IP has changed");
if (!ipv6_addr_equals((union v6addr *)&l3->daddr, &backend_ip))
test_fatal("dst IP has changed");
if (l3->nexthdr != NEXTHDR_DEST)
test_fatal("nexthdr in IPv6 header has changed")
if (opt->hdr.nexthdr != IPPROTO_TCP)
test_fatal("nexthdr in DSR extension has changed")
if (opt->hdr.hdrlen != DSR_IPV6_EXT_LEN)
test_fatal("length in DSR extension has changed")
if (opt->opt_type != DSR_IPV6_OPT_TYPE)
test_fatal("opt_type in DSR extension has changed")
if (opt->opt_len != DSR_IPV6_OPT_LEN)
test_fatal("opt_len in DSR extension has changed")
if (opt->port != FRONTEND_PORT)
test_fatal("port in DSR extension has changed")
if (!ipv6_addr_equals((union v6addr *)&opt->addr, &frontend_ip))
test_fatal("addr in DSR extension has changed")
if (l4->source != CLIENT_PORT)
test_fatal("src port has changed");
if (l4->dest != BACKEND_PORT)
test_fatal("dst port has changed");
struct ipv6_ct_tuple tuple;
struct ct_entry *ct_entry;
int l4_off, ret;
ret = lb6_extract_tuple(ctx, l3, sizeof(*status_code) + ETH_HLEN,
&l4_off, &tuple);
assert(!IS_ERR(ret));
tuple.flags = TUPLE_F_IN;
ipv6_ct_tuple_reverse(&tuple);
ct_entry = map_lookup_elem(get_ct_map6(&tuple), &tuple);
if (!ct_entry)
test_fatal("no CT entry for DSR found");
if (!ct_entry->dsr)
test_fatal("CT entry doesn't have the .dsr flag set");
struct ipv6_nat_entry *nat_entry;
tuple.sport = BACKEND_PORT;
tuple.dport = CLIENT_PORT;
nat_entry = snat_v6_lookup(&tuple);
if (!nat_entry)
test_fatal("no SNAT entry for DSR found");
if (!ipv6_addr_equals((union v6addr *)&nat_entry->to_saddr, &frontend_ip))
test_fatal("SNAT entry has wrong address");
if (nat_entry->to_sport != FRONTEND_PORT)
test_fatal("SNAT entry has wrong port");
test_finish();
}
static __always_inline
int build_reply(struct __ctx_buff *ctx)
{
union v6addr backend_ip = BACKEND_IP;
union v6addr client_ip = CLIENT_IP;
struct pktgen builder;
struct tcphdr *l4;
void *data;
/* Init packet builder */
pktgen__init(&builder, ctx);
l4 = pktgen__push_ipv6_tcp_packet(&builder,
(__u8 *)node_mac, (__u8 *)client_mac,
(__u8 *)&backend_ip, (__u8 *)&client_ip,
BACKEND_PORT, CLIENT_PORT);
if (!l4)
return TEST_ERROR;
data = pktgen__push_data(&builder, default_data, sizeof(default_data));
if (!data)
return TEST_ERROR;
/* Calc lengths, set protocol fields and calc checksums */
pktgen__finish(&builder);
return 0;
}
static __always_inline
int check_reply(const struct __ctx_buff *ctx)
{
union v6addr frontend_ip = FRONTEND_IP;
union v6addr client_ip = CLIENT_IP;
void *data, *data_end;
__u32 *status_code;
struct ipv6hdr *l3;
struct tcphdr *l4;
struct ethhdr *l2;
test_init();
data = (void *)(long)ctx_data(ctx);
data_end = (void *)(long)ctx->data_end;
if (data + sizeof(__u32) > data_end)
test_fatal("status code out of bounds");
status_code = data;
assert(*status_code == CTX_ACT_OK);
l2 = data + sizeof(__u32);
if ((void *)l2 + sizeof(struct ethhdr) > data_end)
test_fatal("l2 out of bounds");
l3 = (void *)l2 + sizeof(struct ethhdr);
if ((void *)l3 + sizeof(struct ipv6hdr) > data_end)
test_fatal("l3 out of bounds");
l4 = (void *)l3 + sizeof(struct ipv6hdr);
if ((void *)l4 + sizeof(struct tcphdr) > data_end)
test_fatal("l4 out of bounds");
if (memcmp(l2->h_source, (__u8 *)node_mac, ETH_ALEN) != 0)
test_fatal("src MAC is not the node MAC")
if (memcmp(l2->h_dest, (__u8 *)client_mac, ETH_ALEN) != 0)
test_fatal("dst MAC is not the client MAC")
if (!ipv6_addr_equals((union v6addr *)&l3->saddr, &frontend_ip))
test_fatal("src IP hasn't been RevNATed to frontend IP");
if (!ipv6_addr_equals((union v6addr *)&l3->daddr, &client_ip))
test_fatal("dst IP has changed");
if (l4->source != FRONTEND_PORT)
test_fatal("src port hasn't been RevNATed to frontend port");
if (l4->dest != CLIENT_PORT)
test_fatal("dst port has changed");
test_finish();
}
/* Test that the backend node revDNATs a reply from the
* DSR backend, and sends the reply back to the client.
*/
PKTGEN("tc", "tc_nodeport_dsr_backend_reply")
int nodeport_dsr_backend_reply_pktgen(struct __ctx_buff *ctx)
{
return build_reply(ctx);
}
SETUP("tc", "tc_nodeport_dsr_backend_reply")
int nodeport_dsr_backend_reply_reply_setup(struct __ctx_buff *ctx)
{
/* Jump into the entrypoint */
tail_call_static(ctx, entry_call_map, TO_NETDEV);
/* Fail if we didn't jump */
return TEST_ERROR;
}
CHECK("tc", "tc_nodeport_dsr_backend_reply")
int nodeport_dsr_backend_reply_reply_check(const struct __ctx_buff *ctx)
{
return check_reply(ctx);
}