github.com/cilium/cilium@v1.16.2/bpf/tests/xdp_nodeport_lb4_dsr_lb.c (about)

     1  // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
     2  /* Copyright Authors of Cilium */
     3  
     4  #include "common.h"
     5  
     6  #include <bpf/ctx/xdp.h>
     7  #include "pktgen.h"
     8  
     9  /* Set ETH_HLEN to 14 to indicate that the packet has a 14 byte ethernet header */
    10  #define ETH_HLEN 14
    11  
    12  /* Enable code paths under test */
    13  #define ENABLE_IPV4
    14  #define ENABLE_NODEPORT
    15  #define ENABLE_NODEPORT_ACCELERATION
    16  #define ENABLE_DSR
    17  
    18  #define DISABLE_LOOPBACK_LB
    19  
    20  /* Skip ingress policy checks, not needed to validate hairpin flow */
    21  #define USE_BPF_PROG_FOR_INGRESS_POLICY
    22  #undef FORCE_LOCAL_POLICY_EVAL_AT_SOURCE
    23  
    24  #define CLIENT_IP		v4_ext_one
    25  #define CLIENT_PORT		__bpf_htons(111)
    26  
    27  #define FRONTEND_IP		v4_svc_two
    28  #define FRONTEND_PORT		tcp_svc_one
    29  
    30  #define LB_IP			v4_node_one
    31  #define IPV4_DIRECT_ROUTING	LB_IP
    32  
    33  #define BACKEND_IP		v4_pod_two
    34  #define BACKEND_PORT		__bpf_htons(8080)
    35  
    36  #define fib_lookup mock_fib_lookup
    37  
    38  static volatile const __u8 *client_mac = mac_one;
    39  /* this matches the default node_config.h: */
    40  static volatile const __u8 lb_mac[ETH_ALEN] = { 0xce, 0x72, 0xa7, 0x03, 0x88, 0x56 };
    41  static volatile const __u8 *remote_backend_mac = mac_five;
    42  
    43  long mock_fib_lookup(__maybe_unused void *ctx, struct bpf_fib_lookup *params,
    44  		     __maybe_unused int plen, __maybe_unused __u32 flags)
    45  {
    46  	params->ifindex = 0;
    47  
    48  	if (params->ipv4_dst == BACKEND_IP) {
    49  		__bpf_memcpy_builtin(params->smac, (__u8 *)lb_mac, ETH_ALEN);
    50  		__bpf_memcpy_builtin(params->dmac, (__u8 *)remote_backend_mac, ETH_ALEN);
    51  	} else {
    52  		__bpf_memcpy_builtin(params->smac, (__u8 *)lb_mac, ETH_ALEN);
    53  		__bpf_memcpy_builtin(params->dmac, (__u8 *)client_mac, ETH_ALEN);
    54  	}
    55  
    56  	return 0;
    57  }
    58  
    59  #include <bpf_xdp.c>
    60  
    61  #include "lib/ipcache.h"
    62  #include "lib/lb.h"
    63  
    64  #define FROM_NETDEV	0
    65  
    66  struct {
    67  	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
    68  	__uint(key_size, sizeof(__u32));
    69  	__uint(max_entries, 1);
    70  	__array(values, int());
    71  } entry_call_map __section(".maps") = {
    72  	.values = {
    73  		[FROM_NETDEV] = &cil_xdp_entry,
    74  	},
    75  };
    76  
    77  /* Test that a SVC request that is LBed to a DSR remote backend
    78   * - gets DNATed,
    79   * - has IP Option inserted,
    80   * - gets redirected back out by XDP
    81   */
    82  PKTGEN("xdp", "xdp_nodeport_dsr_fwd")
    83  int nodeport_dsr_fwd_pktgen(struct __ctx_buff *ctx)
    84  {
    85  	struct pktgen builder;
    86  	struct tcphdr *l4;
    87  	void *data;
    88  
    89  	/* Init packet builder */
    90  	pktgen__init(&builder, ctx);
    91  
    92  	l4 = pktgen__push_ipv4_tcp_packet(&builder,
    93  					  (__u8 *)client_mac, (__u8 *)lb_mac,
    94  					  CLIENT_IP, FRONTEND_IP,
    95  					  CLIENT_PORT, FRONTEND_PORT);
    96  	if (!l4)
    97  		return TEST_ERROR;
    98  
    99  	data = pktgen__push_data(&builder, default_data, sizeof(default_data));
   100  	if (!data)
   101  		return TEST_ERROR;
   102  
   103  	/* Calc lengths, set protocol fields and calc checksums */
   104  	pktgen__finish(&builder);
   105  
   106  	return 0;
   107  }
   108  
   109  SETUP("xdp", "xdp_nodeport_dsr_fwd")
   110  int nodeport_dsr_fwd_setup(struct __ctx_buff *ctx)
   111  {
   112  	__u16 revnat_id = 1;
   113  
   114  	lb_v4_add_service(FRONTEND_IP, FRONTEND_PORT, 1, revnat_id);
   115  	lb_v4_add_backend(FRONTEND_IP, FRONTEND_PORT, 1, 124,
   116  			  BACKEND_IP, BACKEND_PORT, IPPROTO_TCP, 0);
   117  
   118  	ipcache_v4_add_entry(BACKEND_IP, 0, 112233, 0, 0);
   119  
   120  	/* Jump into the entrypoint */
   121  	tail_call_static(ctx, entry_call_map, FROM_NETDEV);
   122  	/* Fail if we didn't jump */
   123  	return TEST_ERROR;
   124  }
   125  
   126  CHECK("xdp", "xdp_nodeport_dsr_fwd")
   127  int nodeport_dsr_fwd_check(__maybe_unused const struct __ctx_buff *ctx)
   128  {
   129  	struct dsr_opt_v4 *opt;
   130  	void *data, *data_end;
   131  	__u32 *status_code;
   132  	struct tcphdr *l4;
   133  	struct ethhdr *l2;
   134  	struct iphdr *l3;
   135  
   136  	test_init();
   137  
   138  	data = (void *)(long)ctx_data(ctx);
   139  	data_end = (void *)(long)ctx->data_end;
   140  
   141  	if (data + sizeof(__u32) > data_end)
   142  		test_fatal("status code out of bounds");
   143  
   144  	status_code = data;
   145  
   146  	assert(fib_ok(*status_code));
   147  
   148  	l2 = data + sizeof(__u32);
   149  	if ((void *)l2 + sizeof(struct ethhdr) > data_end)
   150  		test_fatal("l2 out of bounds");
   151  
   152  	l3 = (void *)l2 + sizeof(struct ethhdr);
   153  	if ((void *)l3 + sizeof(struct iphdr) > data_end)
   154  		test_fatal("l3 out of bounds");
   155  
   156  	opt = (void *)l3 + sizeof(struct iphdr);
   157  	if ((void *)opt + 2 * sizeof(__u32) > data_end)
   158  		test_fatal("l3 DSR option out of bounds");
   159  
   160  	l4 = (void *)opt + sizeof(*opt);
   161  	if ((void *)l4 + sizeof(struct tcphdr) > data_end)
   162  		test_fatal("l4 out of bounds");
   163  
   164  	if (memcmp(l2->h_source, (__u8 *)lb_mac, ETH_ALEN) != 0)
   165  		test_fatal("src MAC is not the LB MAC")
   166  	if (memcmp(l2->h_dest, (__u8 *)remote_backend_mac, ETH_ALEN) != 0)
   167  		test_fatal("dst MAC is not the backend MAC")
   168  
   169  	if (l3->saddr != CLIENT_IP)
   170  		test_fatal("src IP has changed");
   171  
   172  	if (l3->daddr != BACKEND_IP)
   173  		test_fatal("dst IP hasn't been NATed to remote backend IP");
   174  
   175  	if (l3->check != bpf_htons(0x434a))
   176  		test_fatal("L3 checksum is invalid: %d", bpf_htons(l3->check));
   177  
   178  	if (opt->type != DSR_IPV4_OPT_TYPE)
   179  		test_fatal("type in DSR IP option is bad")
   180  	if (opt->len != 8)
   181  		test_fatal("length in DSR IP option is bad")
   182  	if (opt->port != __bpf_ntohs(FRONTEND_PORT))
   183  		test_fatal("port in DSR IP option is bad")
   184  	if (opt->addr != __bpf_ntohl(FRONTEND_IP))
   185  		test_fatal("addr in DSR IP option is bad")
   186  
   187  	if (l4->source != CLIENT_PORT)
   188  		test_fatal("src port has changed");
   189  
   190  	if (l4->dest != BACKEND_PORT)
   191  		test_fatal("dst port hasn't been NATed to backend port");
   192  
   193  	test_finish();
   194  }