Re: [PATCH bpf,v2 4/4] selftests/bpf: Add tc_socket_lookup tests

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On Sun, Apr 23, 2023 at 2:31 AM Gilad Sever <gilad9366@xxxxxxxxx> wrote:
>
>
> On 20/04/2023 19:44, Stanislav Fomichev wrote:
> > On 04/20, Gilad Sever wrote:
> >> Verify that socket lookup via TC with all BPF APIs is VRF aware.
> >>
> >> Signed-off-by: Gilad Sever <gilad9366@xxxxxxxxx>
> >> ---
> >> v2: Fix build by initializing vars with -1
> >> ---
> >>   .../bpf/prog_tests/tc_socket_lookup.c         | 341 ++++++++++++++++++
> >>   .../selftests/bpf/progs/tc_socket_lookup.c    |  73 ++++
> >>   2 files changed, 414 insertions(+)
> >>   create mode 100644 tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c
> >>   create mode 100644 tools/testing/selftests/bpf/progs/tc_socket_lookup.c
> >>
> >> diff --git a/tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c b/tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c
> >> new file mode 100644
> >> index 000000000000..5dcaf0ea3f8c
> >> --- /dev/null
> >> +++ b/tools/testing/selftests/bpf/prog_tests/tc_socket_lookup.c
> >> @@ -0,0 +1,341 @@
> >> +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
> >> +
> >> +/*
> >> + * Topology:
> >> + * ---------
> >> + *     NS1 namespace         |   NS2 namespace
> >> + *                       |
> >> + *     +--------------+      |   +--------------+
> >> + *     |    veth01    |----------|    veth10    |
> >> + *     | 172.16.1.100 |      |   | 172.16.1.200 |
> >> + *     |     bpf      |      |   +--------------+
> >> + *     +--------------+      |
> >> + *      server(UDP/TCP)      |
> >> + *  +-------------------+    |
> >> + *  |        vrf1       |    |
> >> + *  |  +--------------+ |    |   +--------------+
> >> + *  |  |    veth02    |----------|    veth20    |
> >> + *  |  | 172.16.2.100 | |    |   | 172.16.2.200 |
> >> + *  |  |     bpf      | |    |   +--------------+
> >> + *  |  +--------------+ |    |
> >> + *  |   server(UDP/TCP) |    |
> >> + *  +-------------------+    |
> >> + *
> >> + * Test flow
> >> + * -----------
> >> + *  The tests verifies that socket lookup via TC is VRF aware:
> >> + *  1) Creates two veth pairs between NS1 and NS2:
> >> + *     a) veth01 <-> veth10 outside the VRF
> >> + *     b) veth02 <-> veth20 in the VRF
> >> + *  2) Attaches to veth01 and veth02 a program that calls:
> >> + *     a) bpf_skc_lookup_tcp() with TCP and tcp_skc is true
> >> + *     b) bpf_sk_lookup_tcp() with TCP and tcp_skc is false
> >> + *     c) bpf_sk_lookup_udp() with UDP
> >> + *     The program stores the lookup result in bss->lookup_status.
> >> + *  3) Creates a socket TCP/UDP server in/outside the VRF.
> >> + *  4) The test expects lookup_status to be:
> >> + *     a) 0 from device in VRF to server outside VRF
> >> + *     b) 0 from device outside VRF to server in VRF
> >> + *     c) 1 from device in VRF to server in VRF
> >> + *     d) 1 from device outside VRF to server outside VRF
> >> + */
> >> +
> >> +#include <net/if.h>
> >> +
> >> +#include "test_progs.h"
> >> +#include "network_helpers.h"
> >> +#include "tc_socket_lookup.skel.h"
> >> +
> >> +#define NS1 "tc_socket_lookup_1"
> >> +#define NS2 "tc_socket_lookup_2"
> >> +
> >> +#define IP4_ADDR_VETH01 "172.16.1.100"
> >> +#define IP4_ADDR_VETH10 "172.16.1.200"
> >> +#define IP4_ADDR_VETH02 "172.16.2.100"
> >> +#define IP4_ADDR_VETH20 "172.16.2.200"
> >> +
> >> +#define NON_VRF_PORT 5000
> >> +#define IN_VRF_PORT 5001
> >> +
> >> +#define IO_TIMEOUT_SEC      3
> >> +
> >> +#define SYS(fmt, ...)                                               \
> >> +    ({                                                      \
> >> +            char cmd[1024];                                 \
> >> +            snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
> >> +            if (!ASSERT_OK(system(cmd), cmd))               \
> >> +                    goto fail;                              \
> >> +    })
> >> +
> >> +#define SYS_NOFAIL(fmt, ...)                                        \
> >> +    ({                                                      \
> >> +            char cmd[1024];                                 \
> >> +            snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
> >> +            system(cmd);                                    \
> >> +    })
> > [..]
> >
> >> +static int make_socket(int sotype, const char *ip, int port,
> >> +                   struct sockaddr_storage *addr)
> >> +{
> >> +    struct timeval timeo = { .tv_sec = IO_TIMEOUT_SEC };
> >> +    int err, fd;
> >> +
> >> +    err = make_sockaddr(AF_INET, ip, port, addr, NULL);
> >> +    if (!ASSERT_OK(err, "make_address"))
> >> +            return -1;
> >> +
> >> +    fd = socket(AF_INET, sotype, 0);
> >> +    if (!ASSERT_OK(fd < 0, "socket"))
> >> +            return -1;
> >> +
> >> +    err = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo));
> >> +    if (!ASSERT_OK(err, "setsockopt(SO_SNDTIMEO)"))
> >> +            goto fail;
> >> +
> >> +    err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(timeo));
> >> +    if (!ASSERT_OK(err, "setsockopt(SO_RCVTIMEO)"))
> >> +            goto fail;
> >> +
> >> +    return fd;
> >> +fail:
> >> +    close(fd);
> >> +    return -1;
> >> +}
> >> +
> >> +static int make_server(int sotype, const char *ip, int port, const char *ifname)
> >> +{
> >> +    struct sockaddr_storage addr = {};
> >> +    const int one = 1;
> >> +    int err, fd = -1;
> >> +
> >> +    fd = make_socket(sotype, ip, port, &addr);
> >> +    if (fd < 0)
> >> +            return -1;
> >> +
> >> +    if (sotype == SOCK_STREAM) {
> >> +            err = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one,
> >> +                             sizeof(one));
> >> +            if (!ASSERT_OK(err, "setsockopt(SO_REUSEADDR)"))
> >> +                    goto fail;
> >> +    }
> >> +
> >> +    if (ifname) {
> >> +            err = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
> >> +                             ifname, strlen(ifname) + 1);
> >> +            if (!ASSERT_OK(err, "setsockopt(SO_BINDTODEVICE)"))
> >> +                    goto fail;
> >> +    }
> >> +
> >> +    err = bind(fd, (void *)&addr, sizeof(struct sockaddr_in));
> >> +    if (!ASSERT_OK(err, "bind"))
> >> +            goto fail;
> >> +
> >> +    if (sotype == SOCK_STREAM) {
> >> +            err = listen(fd, SOMAXCONN);
> >> +            if (!ASSERT_OK(err, "listen"))
> >> +                    goto fail;
> >> +    }
> >> +
> >> +    return fd;
> >> +fail:
> >> +    close(fd);
> >> +    return -1;
> >> +}
> > Any reason you're not using start_server from network_helpers.h?
> > It's because I need to bind the server socket to the VRF device.

I see, thanks, so it's the SO_BINDTODEVICE part. Looks generic enough
to belong to network_helpers.h. WDYT?
Does it make sense to extend __start_server to support it? Or have a
new separate network_helper for this?




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