Commit 50b3ed57 authored by Petar Penkov's avatar Petar Penkov Committed by Alexei Starovoitov

selftests/bpf: test bpf flow dissection

Adds a test that sends different types of packets over multiple
tunnels and verifies that valid packets are dissected correctly.  To do
so, a tc-flower rule is added to drop packets on UDP src port 9, and
packets are sent from ports 8, 9, and 10. Only the packets on port 9
should be dropped. Because tc-flower relies on the flow dissector to
match flows, correct classification demonstrates correct dissection.

Also add support logic to load the BPF program and to inject the test
packets.
Signed-off-by: default avatarPetar Penkov <ppenkov@google.com>
Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 9c98b13c
......@@ -23,3 +23,5 @@ test_skb_cgroup_id_user
test_socket_cookie
test_cgroup_storage
test_select_reuseport
test_flow_dissector
flow_dissector_load
......@@ -47,10 +47,12 @@ TEST_PROGS := test_kmod.sh \
test_tunnel.sh \
test_lwt_seg6local.sh \
test_lirc_mode2.sh \
test_skb_cgroup_id.sh
test_skb_cgroup_id.sh \
test_flow_dissector.sh
# Compile but not part of 'make run_tests'
TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr test_skb_cgroup_id_user
TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr test_skb_cgroup_id_user \
flow_dissector_load test_flow_dissector
include ../lib.mk
......
......@@ -18,3 +18,4 @@ CONFIG_CRYPTO_HMAC=m
CONFIG_CRYPTO_SHA256=m
CONFIG_VXLAN=y
CONFIG_GENEVE=y
CONFIG_NET_CLS_FLOWER=m
// SPDX-License-Identifier: GPL-2.0
#include <error.h>
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
const char *cfg_pin_path = "/sys/fs/bpf/flow_dissector";
const char *cfg_map_name = "jmp_table";
bool cfg_attach = true;
char *cfg_section_name;
char *cfg_path_name;
static void load_and_attach_program(void)
{
struct bpf_program *prog, *main_prog;
struct bpf_map *prog_array;
int i, fd, prog_fd, ret;
struct bpf_object *obj;
int prog_array_fd;
ret = bpf_prog_load(cfg_path_name, BPF_PROG_TYPE_FLOW_DISSECTOR, &obj,
&prog_fd);
if (ret)
error(1, 0, "bpf_prog_load %s", cfg_path_name);
main_prog = bpf_object__find_program_by_title(obj, cfg_section_name);
if (!main_prog)
error(1, 0, "bpf_object__find_program_by_title %s",
cfg_section_name);
prog_fd = bpf_program__fd(main_prog);
if (prog_fd < 0)
error(1, 0, "bpf_program__fd");
prog_array = bpf_object__find_map_by_name(obj, cfg_map_name);
if (!prog_array)
error(1, 0, "bpf_object__find_map_by_name %s", cfg_map_name);
prog_array_fd = bpf_map__fd(prog_array);
if (prog_array_fd < 0)
error(1, 0, "bpf_map__fd %s", cfg_map_name);
i = 0;
bpf_object__for_each_program(prog, obj) {
fd = bpf_program__fd(prog);
if (fd < 0)
error(1, 0, "bpf_program__fd");
if (fd != prog_fd) {
printf("%d: %s\n", i, bpf_program__title(prog, false));
bpf_map_update_elem(prog_array_fd, &i, &fd, BPF_ANY);
++i;
}
}
ret = bpf_prog_attach(prog_fd, 0 /* Ignore */, BPF_FLOW_DISSECTOR, 0);
if (ret)
error(1, 0, "bpf_prog_attach %s", cfg_path_name);
ret = bpf_object__pin(obj, cfg_pin_path);
if (ret)
error(1, 0, "bpf_object__pin %s", cfg_pin_path);
}
static void detach_program(void)
{
char command[64];
int ret;
ret = bpf_prog_detach(0, BPF_FLOW_DISSECTOR);
if (ret)
error(1, 0, "bpf_prog_detach");
/* To unpin, it is necessary and sufficient to just remove this dir */
sprintf(command, "rm -r %s", cfg_pin_path);
ret = system(command);
if (ret)
error(1, errno, command);
}
static void parse_opts(int argc, char **argv)
{
bool attach = false;
bool detach = false;
int c;
while ((c = getopt(argc, argv, "adp:s:")) != -1) {
switch (c) {
case 'a':
if (detach)
error(1, 0, "attach/detach are exclusive");
attach = true;
break;
case 'd':
if (attach)
error(1, 0, "attach/detach are exclusive");
detach = true;
break;
case 'p':
if (cfg_path_name)
error(1, 0, "only one prog name can be given");
cfg_path_name = optarg;
break;
case 's':
if (cfg_section_name)
error(1, 0, "only one section can be given");
cfg_section_name = optarg;
break;
}
}
if (detach)
cfg_attach = false;
if (cfg_attach && !cfg_path_name)
error(1, 0, "must provide a path to the BPF program");
if (cfg_attach && !cfg_section_name)
error(1, 0, "must provide a section name");
}
int main(int argc, char **argv)
{
parse_opts(argc, argv);
if (cfg_attach)
load_and_attach_program();
else
detach_program();
return 0;
}
// SPDX-License-Identifier: GPL-2.0
/*
* Inject packets with all sorts of encapsulation into the kernel.
*
* IPv4/IPv6 outer layer 3
* GRE/GUE/BARE outer layer 4, where bare is IPIP/SIT/IPv4-in-IPv6/..
* IPv4/IPv6 inner layer 3
*/
#define _GNU_SOURCE
#include <stddef.h>
#include <arpa/inet.h>
#include <asm/byteorder.h>
#include <error.h>
#include <errno.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/ipv6.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <poll.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#define CFG_PORT_INNER 8000
/* Add some protocol definitions that do not exist in userspace */
struct grehdr {
uint16_t unused;
uint16_t protocol;
} __attribute__((packed));
struct guehdr {
union {
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u8 hlen:5,
control:1,
version:2;
#elif defined (__BIG_ENDIAN_BITFIELD)
__u8 version:2,
control:1,
hlen:5;
#else
#error "Please fix <asm/byteorder.h>"
#endif
__u8 proto_ctype;
__be16 flags;
};
__be32 word;
};
};
static uint8_t cfg_dsfield_inner;
static uint8_t cfg_dsfield_outer;
static uint8_t cfg_encap_proto;
static bool cfg_expect_failure = false;
static int cfg_l3_extra = AF_UNSPEC; /* optional SIT prefix */
static int cfg_l3_inner = AF_UNSPEC;
static int cfg_l3_outer = AF_UNSPEC;
static int cfg_num_pkt = 10;
static int cfg_num_secs = 0;
static char cfg_payload_char = 'a';
static int cfg_payload_len = 100;
static int cfg_port_gue = 6080;
static bool cfg_only_rx;
static bool cfg_only_tx;
static int cfg_src_port = 9;
static char buf[ETH_DATA_LEN];
#define INIT_ADDR4(name, addr4, port) \
static struct sockaddr_in name = { \
.sin_family = AF_INET, \
.sin_port = __constant_htons(port), \
.sin_addr.s_addr = __constant_htonl(addr4), \
};
#define INIT_ADDR6(name, addr6, port) \
static struct sockaddr_in6 name = { \
.sin6_family = AF_INET6, \
.sin6_port = __constant_htons(port), \
.sin6_addr = addr6, \
};
INIT_ADDR4(in_daddr4, INADDR_LOOPBACK, CFG_PORT_INNER)
INIT_ADDR4(in_saddr4, INADDR_LOOPBACK + 2, 0)
INIT_ADDR4(out_daddr4, INADDR_LOOPBACK, 0)
INIT_ADDR4(out_saddr4, INADDR_LOOPBACK + 1, 0)
INIT_ADDR4(extra_daddr4, INADDR_LOOPBACK, 0)
INIT_ADDR4(extra_saddr4, INADDR_LOOPBACK + 1, 0)
INIT_ADDR6(in_daddr6, IN6ADDR_LOOPBACK_INIT, CFG_PORT_INNER)
INIT_ADDR6(in_saddr6, IN6ADDR_LOOPBACK_INIT, 0)
INIT_ADDR6(out_daddr6, IN6ADDR_LOOPBACK_INIT, 0)
INIT_ADDR6(out_saddr6, IN6ADDR_LOOPBACK_INIT, 0)
INIT_ADDR6(extra_daddr6, IN6ADDR_LOOPBACK_INIT, 0)
INIT_ADDR6(extra_saddr6, IN6ADDR_LOOPBACK_INIT, 0)
static unsigned long util_gettime(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
}
static void util_printaddr(const char *msg, struct sockaddr *addr)
{
unsigned long off = 0;
char nbuf[INET6_ADDRSTRLEN];
switch (addr->sa_family) {
case PF_INET:
off = __builtin_offsetof(struct sockaddr_in, sin_addr);
break;
case PF_INET6:
off = __builtin_offsetof(struct sockaddr_in6, sin6_addr);
break;
default:
error(1, 0, "printaddr: unsupported family %u\n",
addr->sa_family);
}
if (!inet_ntop(addr->sa_family, ((void *) addr) + off, nbuf,
sizeof(nbuf)))
error(1, errno, "inet_ntop");
fprintf(stderr, "%s: %s\n", msg, nbuf);
}
static unsigned long add_csum_hword(const uint16_t *start, int num_u16)
{
unsigned long sum = 0;
int i;
for (i = 0; i < num_u16; i++)
sum += start[i];
return sum;
}
static uint16_t build_ip_csum(const uint16_t *start, int num_u16,
unsigned long sum)
{
sum += add_csum_hword(start, num_u16);
while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);
return ~sum;
}
static void build_ipv4_header(void *header, uint8_t proto,
uint32_t src, uint32_t dst,
int payload_len, uint8_t tos)
{
struct iphdr *iph = header;
iph->ihl = 5;
iph->version = 4;
iph->tos = tos;
iph->ttl = 8;
iph->tot_len = htons(sizeof(*iph) + payload_len);
iph->id = htons(1337);
iph->protocol = proto;
iph->saddr = src;
iph->daddr = dst;
iph->check = build_ip_csum((void *) iph, iph->ihl << 1, 0);
}
static void ipv6_set_dsfield(struct ipv6hdr *ip6h, uint8_t dsfield)
{
uint16_t val, *ptr = (uint16_t *)ip6h;
val = ntohs(*ptr);
val &= 0xF00F;
val |= ((uint16_t) dsfield) << 4;
*ptr = htons(val);
}
static void build_ipv6_header(void *header, uint8_t proto,
struct sockaddr_in6 *src,
struct sockaddr_in6 *dst,
int payload_len, uint8_t dsfield)
{
struct ipv6hdr *ip6h = header;
ip6h->version = 6;
ip6h->payload_len = htons(payload_len);
ip6h->nexthdr = proto;
ip6h->hop_limit = 8;
ipv6_set_dsfield(ip6h, dsfield);
memcpy(&ip6h->saddr, &src->sin6_addr, sizeof(ip6h->saddr));
memcpy(&ip6h->daddr, &dst->sin6_addr, sizeof(ip6h->daddr));
}
static uint16_t build_udp_v4_csum(const struct iphdr *iph,
const struct udphdr *udph,
int num_words)
{
unsigned long pseudo_sum;
int num_u16 = sizeof(iph->saddr); /* halfwords: twice byte len */
pseudo_sum = add_csum_hword((void *) &iph->saddr, num_u16);
pseudo_sum += htons(IPPROTO_UDP);
pseudo_sum += udph->len;
return build_ip_csum((void *) udph, num_words, pseudo_sum);
}
static uint16_t build_udp_v6_csum(const struct ipv6hdr *ip6h,
const struct udphdr *udph,
int num_words)
{
unsigned long pseudo_sum;
int num_u16 = sizeof(ip6h->saddr); /* halfwords: twice byte len */
pseudo_sum = add_csum_hword((void *) &ip6h->saddr, num_u16);
pseudo_sum += htons(ip6h->nexthdr);
pseudo_sum += ip6h->payload_len;
return build_ip_csum((void *) udph, num_words, pseudo_sum);
}
static void build_udp_header(void *header, int payload_len,
uint16_t dport, int family)
{
struct udphdr *udph = header;
int len = sizeof(*udph) + payload_len;
udph->source = htons(cfg_src_port);
udph->dest = htons(dport);
udph->len = htons(len);
udph->check = 0;
if (family == AF_INET)
udph->check = build_udp_v4_csum(header - sizeof(struct iphdr),
udph, len >> 1);
else
udph->check = build_udp_v6_csum(header - sizeof(struct ipv6hdr),
udph, len >> 1);
}
static void build_gue_header(void *header, uint8_t proto)
{
struct guehdr *gueh = header;
gueh->proto_ctype = proto;
}
static void build_gre_header(void *header, uint16_t proto)
{
struct grehdr *greh = header;
greh->protocol = htons(proto);
}
static int l3_length(int family)
{
if (family == AF_INET)
return sizeof(struct iphdr);
else
return sizeof(struct ipv6hdr);
}
static int build_packet(void)
{
int ol3_len = 0, ol4_len = 0, il3_len = 0, il4_len = 0;
int el3_len = 0;
if (cfg_l3_extra)
el3_len = l3_length(cfg_l3_extra);
/* calculate header offsets */
if (cfg_encap_proto) {
ol3_len = l3_length(cfg_l3_outer);
if (cfg_encap_proto == IPPROTO_GRE)
ol4_len = sizeof(struct grehdr);
else if (cfg_encap_proto == IPPROTO_UDP)
ol4_len = sizeof(struct udphdr) + sizeof(struct guehdr);
}
il3_len = l3_length(cfg_l3_inner);
il4_len = sizeof(struct udphdr);
if (el3_len + ol3_len + ol4_len + il3_len + il4_len + cfg_payload_len >=
sizeof(buf))
error(1, 0, "packet too large\n");
/*
* Fill packet from inside out, to calculate correct checksums.
* But create ip before udp headers, as udp uses ip for pseudo-sum.
*/
memset(buf + el3_len + ol3_len + ol4_len + il3_len + il4_len,
cfg_payload_char, cfg_payload_len);
/* add zero byte for udp csum padding */
buf[el3_len + ol3_len + ol4_len + il3_len + il4_len + cfg_payload_len] = 0;
switch (cfg_l3_inner) {
case PF_INET:
build_ipv4_header(buf + el3_len + ol3_len + ol4_len,
IPPROTO_UDP,
in_saddr4.sin_addr.s_addr,
in_daddr4.sin_addr.s_addr,
il4_len + cfg_payload_len,
cfg_dsfield_inner);
break;
case PF_INET6:
build_ipv6_header(buf + el3_len + ol3_len + ol4_len,
IPPROTO_UDP,
&in_saddr6, &in_daddr6,
il4_len + cfg_payload_len,
cfg_dsfield_inner);
break;
}
build_udp_header(buf + el3_len + ol3_len + ol4_len + il3_len,
cfg_payload_len, CFG_PORT_INNER, cfg_l3_inner);
if (!cfg_encap_proto)
return il3_len + il4_len + cfg_payload_len;
switch (cfg_l3_outer) {
case PF_INET:
build_ipv4_header(buf + el3_len, cfg_encap_proto,
out_saddr4.sin_addr.s_addr,
out_daddr4.sin_addr.s_addr,
ol4_len + il3_len + il4_len + cfg_payload_len,
cfg_dsfield_outer);
break;
case PF_INET6:
build_ipv6_header(buf + el3_len, cfg_encap_proto,
&out_saddr6, &out_daddr6,
ol4_len + il3_len + il4_len + cfg_payload_len,
cfg_dsfield_outer);
break;
}
switch (cfg_encap_proto) {
case IPPROTO_UDP:
build_gue_header(buf + el3_len + ol3_len + ol4_len -
sizeof(struct guehdr),
cfg_l3_inner == PF_INET ? IPPROTO_IPIP
: IPPROTO_IPV6);
build_udp_header(buf + el3_len + ol3_len,
sizeof(struct guehdr) + il3_len + il4_len +
cfg_payload_len,
cfg_port_gue, cfg_l3_outer);
break;
case IPPROTO_GRE:
build_gre_header(buf + el3_len + ol3_len,
cfg_l3_inner == PF_INET ? ETH_P_IP
: ETH_P_IPV6);
break;
}
switch (cfg_l3_extra) {
case PF_INET:
build_ipv4_header(buf,
cfg_l3_outer == PF_INET ? IPPROTO_IPIP
: IPPROTO_IPV6,
extra_saddr4.sin_addr.s_addr,
extra_daddr4.sin_addr.s_addr,
ol3_len + ol4_len + il3_len + il4_len +
cfg_payload_len, 0);
break;
case PF_INET6:
build_ipv6_header(buf,
cfg_l3_outer == PF_INET ? IPPROTO_IPIP
: IPPROTO_IPV6,
&extra_saddr6, &extra_daddr6,
ol3_len + ol4_len + il3_len + il4_len +
cfg_payload_len, 0);
break;
}
return el3_len + ol3_len + ol4_len + il3_len + il4_len +
cfg_payload_len;
}
/* sender transmits encapsulated over RAW or unencap'd over UDP */
static int setup_tx(void)
{
int family, fd, ret;
if (cfg_l3_extra)
family = cfg_l3_extra;
else if (cfg_l3_outer)
family = cfg_l3_outer;
else
family = cfg_l3_inner;
fd = socket(family, SOCK_RAW, IPPROTO_RAW);
if (fd == -1)
error(1, errno, "socket tx");
if (cfg_l3_extra) {
if (cfg_l3_extra == PF_INET)
ret = connect(fd, (void *) &extra_daddr4,
sizeof(extra_daddr4));
else
ret = connect(fd, (void *) &extra_daddr6,
sizeof(extra_daddr6));
if (ret)
error(1, errno, "connect tx");
} else if (cfg_l3_outer) {
/* connect to destination if not encapsulated */
if (cfg_l3_outer == PF_INET)
ret = connect(fd, (void *) &out_daddr4,
sizeof(out_daddr4));
else
ret = connect(fd, (void *) &out_daddr6,
sizeof(out_daddr6));
if (ret)
error(1, errno, "connect tx");
} else {
/* otherwise using loopback */
if (cfg_l3_inner == PF_INET)
ret = connect(fd, (void *) &in_daddr4,
sizeof(in_daddr4));
else
ret = connect(fd, (void *) &in_daddr6,
sizeof(in_daddr6));
if (ret)
error(1, errno, "connect tx");
}
return fd;
}
/* receiver reads unencapsulated UDP */
static int setup_rx(void)
{
int fd, ret;
fd = socket(cfg_l3_inner, SOCK_DGRAM, 0);
if (fd == -1)
error(1, errno, "socket rx");
if (cfg_l3_inner == PF_INET)
ret = bind(fd, (void *) &in_daddr4, sizeof(in_daddr4));
else
ret = bind(fd, (void *) &in_daddr6, sizeof(in_daddr6));
if (ret)
error(1, errno, "bind rx");
return fd;
}
static int do_tx(int fd, const char *pkt, int len)
{
int ret;
ret = write(fd, pkt, len);
if (ret == -1)
error(1, errno, "send");
if (ret != len)
error(1, errno, "send: len (%d < %d)\n", ret, len);
return 1;
}
static int do_poll(int fd, short events, int timeout)
{
struct pollfd pfd;
int ret;
pfd.fd = fd;
pfd.events = events;
ret = poll(&pfd, 1, timeout);
if (ret == -1)
error(1, errno, "poll");
if (ret && !(pfd.revents & POLLIN))
error(1, errno, "poll: unexpected event 0x%x\n", pfd.revents);
return ret;
}
static int do_rx(int fd)
{
char rbuf;
int ret, num = 0;
while (1) {
ret = recv(fd, &rbuf, 1, MSG_DONTWAIT);
if (ret == -1 && errno == EAGAIN)
break;
if (ret == -1)
error(1, errno, "recv");
if (rbuf != cfg_payload_char)
error(1, 0, "recv: payload mismatch");
num++;
};
return num;
}
static int do_main(void)
{
unsigned long tstop, treport, tcur;
int fdt = -1, fdr = -1, len, tx = 0, rx = 0;
if (!cfg_only_tx)
fdr = setup_rx();
if (!cfg_only_rx)
fdt = setup_tx();
len = build_packet();
tcur = util_gettime();
treport = tcur + 1000;
tstop = tcur + (cfg_num_secs * 1000);
while (1) {
if (!cfg_only_rx)
tx += do_tx(fdt, buf, len);
if (!cfg_only_tx)
rx += do_rx(fdr);
if (cfg_num_secs) {
tcur = util_gettime();
if (tcur >= tstop)
break;
if (tcur >= treport) {
fprintf(stderr, "pkts: tx=%u rx=%u\n", tx, rx);
tx = 0;
rx = 0;
treport = tcur + 1000;
}
} else {
if (tx == cfg_num_pkt)
break;
}
}
/* read straggler packets, if any */
if (rx < tx) {
tstop = util_gettime() + 100;
while (rx < tx) {
tcur = util_gettime();
if (tcur >= tstop)
break;
do_poll(fdr, POLLIN, tstop - tcur);
rx += do_rx(fdr);
}
}
fprintf(stderr, "pkts: tx=%u rx=%u\n", tx, rx);
if (fdr != -1 && close(fdr))
error(1, errno, "close rx");
if (fdt != -1 && close(fdt))
error(1, errno, "close tx");
/*
* success (== 0) only if received all packets
* unless failure is expected, in which case none must arrive.
*/
if (cfg_expect_failure)
return rx != 0;
else
return rx != tx;
}
static void __attribute__((noreturn)) usage(const char *filepath)
{
fprintf(stderr, "Usage: %s [-e gre|gue|bare|none] [-i 4|6] [-l len] "
"[-O 4|6] [-o 4|6] [-n num] [-t secs] [-R] [-T] "
"[-s <osrc> [-d <odst>] [-S <isrc>] [-D <idst>] "
"[-x <otos>] [-X <itos>] [-f <isport>] [-F]\n",
filepath);
exit(1);
}
static void parse_addr(int family, void *addr, const char *optarg)
{
int ret;
ret = inet_pton(family, optarg, addr);
if (ret == -1)
error(1, errno, "inet_pton");
if (ret == 0)
error(1, 0, "inet_pton: bad string");
}
static void parse_addr4(struct sockaddr_in *addr, const char *optarg)
{
parse_addr(AF_INET, &addr->sin_addr, optarg);
}
static void parse_addr6(struct sockaddr_in6 *addr, const char *optarg)
{
parse_addr(AF_INET6, &addr->sin6_addr, optarg);
}
static int parse_protocol_family(const char *filepath, const char *optarg)
{
if (!strcmp(optarg, "4"))
return PF_INET;
if (!strcmp(optarg, "6"))
return PF_INET6;
usage(filepath);
}
static void parse_opts(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "d:D:e:f:Fhi:l:n:o:O:Rs:S:t:Tx:X:")) != -1) {
switch (c) {
case 'd':
if (cfg_l3_outer == AF_UNSPEC)
error(1, 0, "-d must be preceded by -o");
if (cfg_l3_outer == AF_INET)
parse_addr4(&out_daddr4, optarg);
else
parse_addr6(&out_daddr6, optarg);
break;
case 'D':
if (cfg_l3_inner == AF_UNSPEC)
error(1, 0, "-D must be preceded by -i");
if (cfg_l3_inner == AF_INET)
parse_addr4(&in_daddr4, optarg);
else
parse_addr6(&in_daddr6, optarg);
break;
case 'e':
if (!strcmp(optarg, "gre"))
cfg_encap_proto = IPPROTO_GRE;
else if (!strcmp(optarg, "gue"))
cfg_encap_proto = IPPROTO_UDP;
else if (!strcmp(optarg, "bare"))
cfg_encap_proto = IPPROTO_IPIP;
else if (!strcmp(optarg, "none"))
cfg_encap_proto = IPPROTO_IP; /* == 0 */
else
usage(argv[0]);
break;
case 'f':
cfg_src_port = strtol(optarg, NULL, 0);
break;
case 'F':
cfg_expect_failure = true;
break;
case 'h':
usage(argv[0]);
break;
case 'i':
if (!strcmp(optarg, "4"))
cfg_l3_inner = PF_INET;
else if (!strcmp(optarg, "6"))
cfg_l3_inner = PF_INET6;
else
usage(argv[0]);
break;
case 'l':
cfg_payload_len = strtol(optarg, NULL, 0);
break;
case 'n':
cfg_num_pkt = strtol(optarg, NULL, 0);
break;
case 'o':
cfg_l3_outer = parse_protocol_family(argv[0], optarg);
break;
case 'O':
cfg_l3_extra = parse_protocol_family(argv[0], optarg);
break;
case 'R':
cfg_only_rx = true;
break;
case 's':
if (cfg_l3_outer == AF_INET)
parse_addr4(&out_saddr4, optarg);
else
parse_addr6(&out_saddr6, optarg);
break;
case 'S':
if (cfg_l3_inner == AF_INET)
parse_addr4(&in_saddr4, optarg);
else
parse_addr6(&in_saddr6, optarg);
break;
case 't':
cfg_num_secs = strtol(optarg, NULL, 0);
break;
case 'T':
cfg_only_tx = true;
break;
case 'x':
cfg_dsfield_outer = strtol(optarg, NULL, 0);
break;
case 'X':
cfg_dsfield_inner = strtol(optarg, NULL, 0);
break;
}
}
if (cfg_only_rx && cfg_only_tx)
error(1, 0, "options: cannot combine rx-only and tx-only");
if (cfg_encap_proto && cfg_l3_outer == AF_UNSPEC)
error(1, 0, "options: must specify outer with encap");
else if ((!cfg_encap_proto) && cfg_l3_outer != AF_UNSPEC)
error(1, 0, "options: cannot combine no-encap and outer");
else if ((!cfg_encap_proto) && cfg_l3_extra != AF_UNSPEC)
error(1, 0, "options: cannot combine no-encap and extra");
if (cfg_l3_inner == AF_UNSPEC)
cfg_l3_inner = AF_INET6;
if (cfg_l3_inner == AF_INET6 && cfg_encap_proto == IPPROTO_IPIP)
cfg_encap_proto = IPPROTO_IPV6;
/* RFC 6040 4.2:
* on decap, if outer encountered congestion (CE == 0x3),
* but inner cannot encode ECN (NoECT == 0x0), then drop packet.
*/
if (((cfg_dsfield_outer & 0x3) == 0x3) &&
((cfg_dsfield_inner & 0x3) == 0x0))
cfg_expect_failure = true;
}
static void print_opts(void)
{
if (cfg_l3_inner == PF_INET6) {
util_printaddr("inner.dest6", (void *) &in_daddr6);
util_printaddr("inner.source6", (void *) &in_saddr6);
} else {
util_printaddr("inner.dest4", (void *) &in_daddr4);
util_printaddr("inner.source4", (void *) &in_saddr4);
}
if (!cfg_l3_outer)
return;
fprintf(stderr, "encap proto: %u\n", cfg_encap_proto);
if (cfg_l3_outer == PF_INET6) {
util_printaddr("outer.dest6", (void *) &out_daddr6);
util_printaddr("outer.source6", (void *) &out_saddr6);
} else {
util_printaddr("outer.dest4", (void *) &out_daddr4);
util_printaddr("outer.source4", (void *) &out_saddr4);
}
if (!cfg_l3_extra)
return;
if (cfg_l3_outer == PF_INET6) {
util_printaddr("extra.dest6", (void *) &extra_daddr6);
util_printaddr("extra.source6", (void *) &extra_saddr6);
} else {
util_printaddr("extra.dest4", (void *) &extra_daddr4);
util_printaddr("extra.source4", (void *) &extra_saddr4);
}
}
int main(int argc, char **argv)
{
parse_opts(argc, argv);
print_opts();
return do_main();
}
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Load BPF flow dissector and verify it correctly dissects traffic
export TESTNAME=test_flow_dissector
unmount=0
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
msg="skip all tests:"
if [ $UID != 0 ]; then
echo $msg please run this as root >&2
exit $ksft_skip
fi
# This test needs to be run in a network namespace with in_netns.sh. Check if
# this is the case and run it with in_netns.sh if it is being run in the root
# namespace.
if [[ -z $(ip netns identify $$) ]]; then
../net/in_netns.sh "$0" "$@"
exit $?
fi
# Determine selftest success via shell exit code
exit_handler()
{
if (( $? == 0 )); then
echo "selftests: $TESTNAME [PASS]";
else
echo "selftests: $TESTNAME [FAILED]";
fi
set +e
# Cleanup
tc filter del dev lo ingress pref 1337 2> /dev/null
tc qdisc del dev lo ingress 2> /dev/null
./flow_dissector_load -d 2> /dev/null
if [ $unmount -ne 0 ]; then
umount bpffs 2> /dev/null
fi
}
# Exit script immediately (well catched by trap handler) if any
# program/thing exits with a non-zero status.
set -e
# (Use 'trap -l' to list meaning of numbers)
trap exit_handler 0 2 3 6 9
# Mount BPF file system
if /bin/mount | grep /sys/fs/bpf > /dev/null; then
echo "bpffs already mounted"
else
echo "bpffs not mounted. Mounting..."
unmount=1
/bin/mount bpffs /sys/fs/bpf -t bpf
fi
# Attach BPF program
./flow_dissector_load -p bpf_flow.o -s dissect
# Setup
tc qdisc add dev lo ingress
echo "Testing IPv4..."
# Drops all IP/UDP packets coming from port 9
tc filter add dev lo parent ffff: protocol ip pref 1337 flower ip_proto \
udp src_port 9 action drop
# Send 10 IPv4/UDP packets from port 8. Filter should not drop any.
./test_flow_dissector -i 4 -f 8
# Send 10 IPv4/UDP packets from port 9. Filter should drop all.
./test_flow_dissector -i 4 -f 9 -F
# Send 10 IPv4/UDP packets from port 10. Filter should not drop any.
./test_flow_dissector -i 4 -f 10
echo "Testing IPIP..."
# Send 10 IPv4/IPv4/UDP packets from port 8. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 8
# Send 10 IPv4/IPv4/UDP packets from port 9. Filter should drop all.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
# Send 10 IPv4/IPv4/UDP packets from port 10. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 10
echo "Testing IPv4 + GRE..."
# Send 10 IPv4/GRE/IPv4/UDP packets from port 8. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 8
# Send 10 IPv4/GRE/IPv4/UDP packets from port 9. Filter should drop all.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
# Send 10 IPv4/GRE/IPv4/UDP packets from port 10. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 10
tc filter del dev lo ingress pref 1337
echo "Testing IPv6..."
# Drops all IPv6/UDP packets coming from port 9
tc filter add dev lo parent ffff: protocol ipv6 pref 1337 flower ip_proto \
udp src_port 9 action drop
# Send 10 IPv6/UDP packets from port 8. Filter should not drop any.
./test_flow_dissector -i 6 -f 8
# Send 10 IPv6/UDP packets from port 9. Filter should drop all.
./test_flow_dissector -i 6 -f 9 -F
# Send 10 IPv6/UDP packets from port 10. Filter should not drop any.
./test_flow_dissector -i 6 -f 10
exit 0
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# add private ipv4 and ipv6 addresses to loopback
readonly V6_INNER='100::a/128'
readonly V4_INNER='192.168.0.1/32'
if getopts ":s" opt; then
readonly SIT_DEV_NAME='sixtofourtest0'
readonly V6_SIT='2::/64'
readonly V4_SIT='172.17.0.1/32'
shift
fi
fail() {
echo "error: $*" 1>&2
exit 1
}
setup() {
ip -6 addr add "${V6_INNER}" dev lo || fail 'failed to setup v6 address'
ip -4 addr add "${V4_INNER}" dev lo || fail 'failed to setup v4 address'
if [[ -n "${V6_SIT}" ]]; then
ip link add "${SIT_DEV_NAME}" type sit remote any local any \
|| fail 'failed to add sit'
ip link set dev "${SIT_DEV_NAME}" up \
|| fail 'failed to bring sit device up'
ip -6 addr add "${V6_SIT}" dev "${SIT_DEV_NAME}" \
|| fail 'failed to setup v6 SIT address'
ip -4 addr add "${V4_SIT}" dev "${SIT_DEV_NAME}" \
|| fail 'failed to setup v4 SIT address'
fi
sleep 2 # avoid race causing bind to fail
}
cleanup() {
if [[ -n "${V6_SIT}" ]]; then
ip -4 addr del "${V4_SIT}" dev "${SIT_DEV_NAME}"
ip -6 addr del "${V6_SIT}" dev "${SIT_DEV_NAME}"
ip link del "${SIT_DEV_NAME}"
fi
ip -4 addr del "${V4_INNER}" dev lo
ip -6 addr del "${V6_INNER}" dev lo
}
trap cleanup EXIT
setup
"$@"
exit "$?"
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# setup tunnels for flow dissection test
readonly SUFFIX="test_$(mktemp -u XXXX)"
CONFIG="remote 127.0.0.2 local 127.0.0.1 dev lo"
setup() {
ip link add "ipip_${SUFFIX}" type ipip ${CONFIG}
ip link add "gre_${SUFFIX}" type gre ${CONFIG}
ip link add "sit_${SUFFIX}" type sit ${CONFIG}
echo "tunnels before test:"
ip tunnel show
ip link set "ipip_${SUFFIX}" up
ip link set "gre_${SUFFIX}" up
ip link set "sit_${SUFFIX}" up
}
cleanup() {
ip tunnel del "ipip_${SUFFIX}"
ip tunnel del "gre_${SUFFIX}"
ip tunnel del "sit_${SUFFIX}"
echo "tunnels after test:"
ip tunnel show
}
trap cleanup EXIT
setup
"$@"
exit "$?"
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