| Message ID | 20240823211902.143210-3-jmaloy@redhat.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | Adding SO_PEEK_OFF for TCPv6 | expand |
Hello Jon, On Sat, Aug 24, 2024 at 5:19 AM <jmaloy@redhat.com> wrote: > > From: Jon Maloy <jmaloy@redhat.com> > > We add a selftest to check that the new feature added in > commit 05ea491641d3 ("tcp: add support for SO_PEEK_OFF socket option") > works correctly. > > Reviewed-by: Stefano Brivio <sbrivio@redhat.com> > Tested-by: Stefano Brivio <sbrivio@redhat.com> > Signed-off-by: Jon Maloy <jmaloy@redhat.com> Thanks for working on this. Sorry that I just noticed I missed your previous reply :( > --- > tools/testing/selftests/net/Makefile | 1 + > tools/testing/selftests/net/tcp_so_peek_off.c | 181 ++++++++++++++++++ > 2 files changed, 182 insertions(+) > create mode 100644 tools/testing/selftests/net/tcp_so_peek_off.c > > diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile > index 8eaffd7a641c..1179e3261bef 100644 > --- a/tools/testing/selftests/net/Makefile > +++ b/tools/testing/selftests/net/Makefile > @@ -80,6 +80,7 @@ TEST_PROGS += io_uring_zerocopy_tx.sh > TEST_GEN_FILES += bind_bhash > TEST_GEN_PROGS += sk_bind_sendto_listen > TEST_GEN_PROGS += sk_connect_zero_addr > +TEST_GEN_PROGS += tcp_so_peek_off > TEST_PROGS += test_ingress_egress_chaining.sh > TEST_GEN_PROGS += so_incoming_cpu > TEST_PROGS += sctp_vrf.sh > diff --git a/tools/testing/selftests/net/tcp_so_peek_off.c b/tools/testing/selftests/net/tcp_so_peek_off.c > new file mode 100644 > index 000000000000..8379ea02e3d7 > --- /dev/null > +++ b/tools/testing/selftests/net/tcp_so_peek_off.c > @@ -0,0 +1,181 @@ > +// SPDX-License-Identifier: GPL-2.0 > + > +#include <stdio.h> > +#include <stdlib.h> > +#include <string.h> > +#include <unistd.h> > +#include <errno.h> > +#include <sys/types.h> > +#include <netinet/in.h> > +#include <arpa/inet.h> > +#include "../kselftest.h" > + > +static char *afstr(int af) > +{ > + return af == AF_INET ? "TCP/IPv4" : "TCP/IPv6"; > +} > + > +int tcp_peek_offset_probe(sa_family_t af) > +{ > + int optv = 0; > + int ret = 0; > + int s; > + > + s = socket(af, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP); > + if (s < 0) { > + ksft_perror("Temporary TCP socket creation failed"); > + } else { > + if (!setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &optv, sizeof(int))) > + ret = 1; > + else > + printf("%s does not support SO_PEEK_OFF\n", afstr(af)); > + close(s); > + } > + return ret; > +} > + > +static void tcp_peek_offset_set(int s, int offset) > +{ > + if (setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, sizeof(offset))) > + ksft_perror("Failed to set SO_PEEK_OFF value\n"); > +} > + > +static int tcp_peek_offset_get(int s) > +{ > + int offset; > + socklen_t len = sizeof(offset); > + > + if (getsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, &len)) > + ksft_perror("Failed to get SO_PEEK_OFF value\n"); > + return offset; > +} > + > +static int tcp_peek_offset_test(sa_family_t af) > +{ > + union { > + struct sockaddr sa; > + struct sockaddr_in a4; > + struct sockaddr_in6 a6; > + } a; > + int res = 0; > + int s[2] = {0, 0}; > + int recv_sock = 0; > + int offset = 0; > + ssize_t len; > + char buf; > + > + memset(&a, 0, sizeof(a)); > + a.sa.sa_family = af; > + > + s[0] = socket(af, SOCK_STREAM, IPPROTO_TCP); > + s[1] = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP); > + > + if (s[0] < 0 || s[1] < 0) { > + ksft_perror("Temporary probe socket creation failed\n"); > + goto out; Nit: I wonder if we can use more proper test statements to avoid such hiding failure[1] when closing a invalid file descriptor, even though it doesn't harm the test itself? [1]: "EBADF (Bad file descriptor)" > + } > + if (bind(s[0], &a.sa, sizeof(a)) < 0) { > + ksft_perror("Temporary probe socket bind() failed\n"); > + goto out; > + } > + if (getsockname(s[0], &a.sa, &((socklen_t) { sizeof(a) })) < 0) { > + ksft_perror("Temporary probe socket getsockname() failed\n"); > + goto out; > + } > + if (listen(s[0], 0) < 0) { > + ksft_perror("Temporary probe socket listen() failed\n"); > + goto out; > + } > + if (connect(s[1], &a.sa, sizeof(a)) >= 0 || errno != EINPROGRESS) { > + ksft_perror("Temporary probe socket connect() failed\n"); > + goto out; > + } > + recv_sock = accept(s[0], NULL, NULL); > + if (recv_sock <= 0) { > + ksft_perror("Temporary probe socket accept() failed\n"); > + goto out; Same here. > + } > + > + /* Some basic tests of getting/setting offset */ > + offset = tcp_peek_offset_get(recv_sock); > + if (offset != -1) { > + ksft_perror("Initial value of socket offset not -1\n"); > + goto out; > + } > + tcp_peek_offset_set(recv_sock, 0); > + offset = tcp_peek_offset_get(recv_sock); > + if (offset != 0) { > + ksft_perror("Failed to set socket offset to 0\n"); > + goto out; > + } > + > + /* Transfer a message */ > + if (send(s[1], (char *)("ab"), 2, 0) <= 0 || errno != EINPROGRESS) { > + ksft_perror("Temporary probe socket send() failed\n"); > + goto out; > + } > + /* Read first byte */ > + len = recv(recv_sock, &buf, 1, MSG_PEEK); > + if (len != 1 || buf != 'a') { > + ksft_perror("Failed to read first byte of message\n"); > + goto out; > + } > + offset = tcp_peek_offset_get(recv_sock); > + if (offset != 1) { > + ksft_perror("Offset not forwarded correctly at first byte\n"); > + goto out; > + } > + /* Try to read beyond last byte */ > + len = recv(recv_sock, &buf, 2, MSG_PEEK); > + if (len != 1 || buf != 'b') { > + ksft_perror("Failed to read last byte of message\n"); > + goto out; > + } > + offset = tcp_peek_offset_get(recv_sock); > + if (offset != 2) { > + ksft_perror("Offset not forwarded correctly at last byte\n"); > + goto out; > + } > + /* Flush message */ > + len = recv(recv_sock, NULL, 2, MSG_TRUNC); > + if (len != 2) { > + ksft_perror("Failed to flush message\n"); > + goto out; > + } > + offset = tcp_peek_offset_get(recv_sock); > + if (offset != 0) { > + ksft_perror("Offset not reverted correctly after flush\n"); > + goto out; > + } > + > + printf("%s with MSG_PEEK_OFF works correctly\n", afstr(af)); > + res = 1; > +out: > + close(recv_sock); > + close(s[1]); > + close(s[0]); > + return res; > +} > + > +int main(void) > +{ > + int res4, res6; > + > + res4 = tcp_peek_offset_probe(AF_INET); > + res6 = tcp_peek_offset_probe(AF_INET6); > + > + if (!res4 && !res6) > + return KSFT_SKIP; > + > + if (res4) > + res4 = tcp_peek_offset_test(AF_INET); > + > + if (res6) > + res6 = tcp_peek_offset_test(AF_INET6); > + > + if (!res4 || !res6) What if res6 is NULL after checking tcp_peek_offset_probe() while res4 is always working correctly, then we will get notified with a KSFT_FAIL failure instead of KSFT_SKIP. The thing could happen because you reuse the same return value for v4/v6 mode. Thanks, Jason > + return KSFT_FAIL; > + > + return KSFT_PASS; > +} > + > -- > 2.45.2 > >
On 2024-08-23 19:44, Jason Xing wrote: > Hello Jon, > > On Sat, Aug 24, 2024 at 5:19 AM <jmaloy@redhat.com> wrote: >> From: Jon Maloy <jmaloy@redhat.com> >> >> We add a selftest to check that the new feature added in >> commit 05ea491641d3 ("tcp: add support for SO_PEEK_OFF socket option") >> works correctly. >> >> Reviewed-by: Stefano Brivio <sbrivio@redhat.com> >> Tested-by: Stefano Brivio <sbrivio@redhat.com> >> Signed-off-by: Jon Maloy <jmaloy@redhat.com> > Thanks for working on this. Sorry that I just noticed I missed your > previous reply :( There is still the ditto UDP selftest to be done ;-) >> --- >> tools/testing/selftests/net/Makefile | 1 + >> tools/testing/selftests/net/tcp_so_peek_off.c | 181 ++++++++++++++++++ >> 2 files changed, 182 insertions(+) >> create mode 100644 tools/testing/selftests/net/tcp_so_peek_off.c >> >> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile >> index 8eaffd7a641c..1179e3261bef 100644 >> --- a/tools/testing/selftests/net/Makefile >> +++ b/tools/testing/selftests/net/Makefile >> @@ -80,6 +80,7 @@ TEST_PROGS += io_uring_zerocopy_tx.sh >> TEST_GEN_FILES += bind_bhash >> TEST_GEN_PROGS += sk_bind_sendto_listen >> TEST_GEN_PROGS += sk_connect_zero_addr >> +TEST_GEN_PROGS += tcp_so_peek_off >> TEST_PROGS += test_ingress_egress_chaining.sh >> TEST_GEN_PROGS += so_incoming_cpu >> TEST_PROGS += sctp_vrf.sh >> diff --git a/tools/testing/selftests/net/tcp_so_peek_off.c b/tools/testing/selftests/net/tcp_so_peek_off.c >> new file mode 100644 >> index 000000000000..8379ea02e3d7 >> --- /dev/null >> +++ b/tools/testing/selftests/net/tcp_so_peek_off.c >> @@ -0,0 +1,181 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> + >> +#include <stdio.h> >> +#include <stdlib.h> >> +#include <string.h> >> +#include <unistd.h> >> +#include <errno.h> >> +#include <sys/types.h> >> +#include <netinet/in.h> >> +#include <arpa/inet.h> >> +#include "../kselftest.h" >> + >> +static char *afstr(int af) >> +{ >> + return af == AF_INET ? "TCP/IPv4" : "TCP/IPv6"; >> +} >> + >> +int tcp_peek_offset_probe(sa_family_t af) >> +{ >> + int optv = 0; >> + int ret = 0; >> + int s; >> + >> + s = socket(af, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP); >> + if (s < 0) { >> + ksft_perror("Temporary TCP socket creation failed"); >> + } else { >> + if (!setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &optv, sizeof(int))) >> + ret = 1; >> + else >> + printf("%s does not support SO_PEEK_OFF\n", afstr(af)); >> + close(s); >> + } >> + return ret; >> +} >> + >> +static void tcp_peek_offset_set(int s, int offset) >> +{ >> + if (setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, sizeof(offset))) >> + ksft_perror("Failed to set SO_PEEK_OFF value\n"); >> +} >> + >> +static int tcp_peek_offset_get(int s) >> +{ >> + int offset; >> + socklen_t len = sizeof(offset); >> + >> + if (getsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, &len)) >> + ksft_perror("Failed to get SO_PEEK_OFF value\n"); >> + return offset; >> +} >> + >> +static int tcp_peek_offset_test(sa_family_t af) >> +{ >> + union { >> + struct sockaddr sa; >> + struct sockaddr_in a4; >> + struct sockaddr_in6 a6; >> + } a; >> + int res = 0; >> + int s[2] = {0, 0}; >> + int recv_sock = 0; >> + int offset = 0; >> + ssize_t len; >> + char buf; >> + >> + memset(&a, 0, sizeof(a)); >> + a.sa.sa_family = af; >> + >> + s[0] = socket(af, SOCK_STREAM, IPPROTO_TCP); >> + s[1] = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP); >> + >> + if (s[0] < 0 || s[1] < 0) { >> + ksft_perror("Temporary probe socket creation failed\n"); >> + goto out; > Nit: I wonder if we can use more proper test statements to avoid such > hiding failure[1] when closing a invalid file descriptor, even though > it doesn't harm the test itself? > > [1]: "EBADF (Bad file descriptor)" Fixed that in v2. >> + } >> + if (bind(s[0], &a.sa, sizeof(a)) < 0) { >> + ksft_perror("Temporary probe socket bind() failed\n"); >> + goto out; >> + } >> + if (getsockname(s[0], &a.sa, &((socklen_t) { sizeof(a) })) < 0) { >> + ksft_perror("Temporary probe socket getsockname() failed\n"); >> + goto out; >> + } >> + if (listen(s[0], 0) < 0) { >> + ksft_perror("Temporary probe socket listen() failed\n"); >> + goto out; >> + } >> + if (connect(s[1], &a.sa, sizeof(a)) >= 0 || errno != EINPROGRESS) { >> + ksft_perror("Temporary probe socket connect() failed\n"); >> + goto out; >> + } >> + recv_sock = accept(s[0], NULL, NULL); >> + if (recv_sock <= 0) { >> + ksft_perror("Temporary probe socket accept() failed\n"); >> + goto out; > Same here. Fixed. >> + } >> + >> + /* Some basic tests of getting/setting offset */ >> + offset = tcp_peek_offset_get(recv_sock); >> + if (offset != -1) { >> + ksft_perror("Initial value of socket offset not -1\n"); >> + goto out; >> + } >> + tcp_peek_offset_set(recv_sock, 0); >> + offset = tcp_peek_offset_get(recv_sock); >> + if (offset != 0) { >> + ksft_perror("Failed to set socket offset to 0\n"); >> + goto out; >> + } >> + >> + /* Transfer a message */ >> + if (send(s[1], (char *)("ab"), 2, 0) <= 0 || errno != EINPROGRESS) { >> + ksft_perror("Temporary probe socket send() failed\n"); >> + goto out; >> + } >> + /* Read first byte */ >> + len = recv(recv_sock, &buf, 1, MSG_PEEK); >> + if (len != 1 || buf != 'a') { >> + ksft_perror("Failed to read first byte of message\n"); >> + goto out; >> + } >> + offset = tcp_peek_offset_get(recv_sock); >> + if (offset != 1) { >> + ksft_perror("Offset not forwarded correctly at first byte\n"); >> + goto out; >> + } >> + /* Try to read beyond last byte */ >> + len = recv(recv_sock, &buf, 2, MSG_PEEK); >> + if (len != 1 || buf != 'b') { >> + ksft_perror("Failed to read last byte of message\n"); >> + goto out; >> + } >> + offset = tcp_peek_offset_get(recv_sock); >> + if (offset != 2) { >> + ksft_perror("Offset not forwarded correctly at last byte\n"); >> + goto out; >> + } >> + /* Flush message */ >> + len = recv(recv_sock, NULL, 2, MSG_TRUNC); >> + if (len != 2) { >> + ksft_perror("Failed to flush message\n"); >> + goto out; >> + } >> + offset = tcp_peek_offset_get(recv_sock); >> + if (offset != 0) { >> + ksft_perror("Offset not reverted correctly after flush\n"); >> + goto out; >> + } >> + >> + printf("%s with MSG_PEEK_OFF works correctly\n", afstr(af)); >> + res = 1; >> +out: >> + close(recv_sock); >> + close(s[1]); >> + close(s[0]); >> + return res; >> +} >> + >> +int main(void) >> +{ >> + int res4, res6; >> + >> + res4 = tcp_peek_offset_probe(AF_INET); >> + res6 = tcp_peek_offset_probe(AF_INET6); >> + >> + if (!res4 && !res6) >> + return KSFT_SKIP; >> + >> + if (res4) >> + res4 = tcp_peek_offset_test(AF_INET); >> + >> + if (res6) >> + res6 = tcp_peek_offset_test(AF_INET6); >> + >> + if (!res4 || !res6) > What if res6 is NULL after checking tcp_peek_offset_probe() while res4 > is always working correctly, then we will get notified with a > KSFT_FAIL failure instead of KSFT_SKIP. This is intentional. If IPv4 is supported, and IPv6 is not, that is a failure. Regards ///jon > The thing could happen because you reuse the same return value for v4/v6 mode. > > Thanks, > Jason > >> + return KSFT_FAIL; >> + >> + return KSFT_PASS; >> +} >> + >> -- >> 2.45.2 >> >>
Hello Jon, On Tue, Aug 27, 2024 at 3:58 AM Jon Maloy <jmaloy@redhat.com> wrote: > > > > On 2024-08-23 19:44, Jason Xing wrote: > > Hello Jon, > > > > On Sat, Aug 24, 2024 at 5:19 AM <jmaloy@redhat.com> wrote: > >> From: Jon Maloy <jmaloy@redhat.com> > >> > >> We add a selftest to check that the new feature added in > >> commit 05ea491641d3 ("tcp: add support for SO_PEEK_OFF socket option") > >> works correctly. > >> > >> Reviewed-by: Stefano Brivio <sbrivio@redhat.com> > >> Tested-by: Stefano Brivio <sbrivio@redhat.com> > >> Signed-off-by: Jon Maloy <jmaloy@redhat.com> > > Thanks for working on this. Sorry that I just noticed I missed your > > previous reply :( > There is still the ditto UDP selftest to be done ;-) The reason why I didn't respond at that time is because I was unsure if I had enough time to finish it. Now it's time. After digging into this, there will be a lot of duplicated code if I write a new one named like "udp_so_peek_off". I think adjusting your tcp_so_peek_off.c to complete the UDP part is just fine. Of course, tcp_so_peek_off.c will be renamed :) I will post one later to see if it's reasonable... Thanks, Jason
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 8eaffd7a641c..1179e3261bef 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -80,6 +80,7 @@ TEST_PROGS += io_uring_zerocopy_tx.sh TEST_GEN_FILES += bind_bhash TEST_GEN_PROGS += sk_bind_sendto_listen TEST_GEN_PROGS += sk_connect_zero_addr +TEST_GEN_PROGS += tcp_so_peek_off TEST_PROGS += test_ingress_egress_chaining.sh TEST_GEN_PROGS += so_incoming_cpu TEST_PROGS += sctp_vrf.sh diff --git a/tools/testing/selftests/net/tcp_so_peek_off.c b/tools/testing/selftests/net/tcp_so_peek_off.c new file mode 100644 index 000000000000..8379ea02e3d7 --- /dev/null +++ b/tools/testing/selftests/net/tcp_so_peek_off.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> +#include <sys/types.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include "../kselftest.h" + +static char *afstr(int af) +{ + return af == AF_INET ? "TCP/IPv4" : "TCP/IPv6"; +} + +int tcp_peek_offset_probe(sa_family_t af) +{ + int optv = 0; + int ret = 0; + int s; + + s = socket(af, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP); + if (s < 0) { + ksft_perror("Temporary TCP socket creation failed"); + } else { + if (!setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &optv, sizeof(int))) + ret = 1; + else + printf("%s does not support SO_PEEK_OFF\n", afstr(af)); + close(s); + } + return ret; +} + +static void tcp_peek_offset_set(int s, int offset) +{ + if (setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, sizeof(offset))) + ksft_perror("Failed to set SO_PEEK_OFF value\n"); +} + +static int tcp_peek_offset_get(int s) +{ + int offset; + socklen_t len = sizeof(offset); + + if (getsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, &len)) + ksft_perror("Failed to get SO_PEEK_OFF value\n"); + return offset; +} + +static int tcp_peek_offset_test(sa_family_t af) +{ + union { + struct sockaddr sa; + struct sockaddr_in a4; + struct sockaddr_in6 a6; + } a; + int res = 0; + int s[2] = {0, 0}; + int recv_sock = 0; + int offset = 0; + ssize_t len; + char buf; + + memset(&a, 0, sizeof(a)); + a.sa.sa_family = af; + + s[0] = socket(af, SOCK_STREAM, IPPROTO_TCP); + s[1] = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP); + + if (s[0] < 0 || s[1] < 0) { + ksft_perror("Temporary probe socket creation failed\n"); + goto out; + } + if (bind(s[0], &a.sa, sizeof(a)) < 0) { + ksft_perror("Temporary probe socket bind() failed\n"); + goto out; + } + if (getsockname(s[0], &a.sa, &((socklen_t) { sizeof(a) })) < 0) { + ksft_perror("Temporary probe socket getsockname() failed\n"); + goto out; + } + if (listen(s[0], 0) < 0) { + ksft_perror("Temporary probe socket listen() failed\n"); + goto out; + } + if (connect(s[1], &a.sa, sizeof(a)) >= 0 || errno != EINPROGRESS) { + ksft_perror("Temporary probe socket connect() failed\n"); + goto out; + } + recv_sock = accept(s[0], NULL, NULL); + if (recv_sock <= 0) { + ksft_perror("Temporary probe socket accept() failed\n"); + goto out; + } + + /* Some basic tests of getting/setting offset */ + offset = tcp_peek_offset_get(recv_sock); + if (offset != -1) { + ksft_perror("Initial value of socket offset not -1\n"); + goto out; + } + tcp_peek_offset_set(recv_sock, 0); + offset = tcp_peek_offset_get(recv_sock); + if (offset != 0) { + ksft_perror("Failed to set socket offset to 0\n"); + goto out; + } + + /* Transfer a message */ + if (send(s[1], (char *)("ab"), 2, 0) <= 0 || errno != EINPROGRESS) { + ksft_perror("Temporary probe socket send() failed\n"); + goto out; + } + /* Read first byte */ + len = recv(recv_sock, &buf, 1, MSG_PEEK); + if (len != 1 || buf != 'a') { + ksft_perror("Failed to read first byte of message\n"); + goto out; + } + offset = tcp_peek_offset_get(recv_sock); + if (offset != 1) { + ksft_perror("Offset not forwarded correctly at first byte\n"); + goto out; + } + /* Try to read beyond last byte */ + len = recv(recv_sock, &buf, 2, MSG_PEEK); + if (len != 1 || buf != 'b') { + ksft_perror("Failed to read last byte of message\n"); + goto out; + } + offset = tcp_peek_offset_get(recv_sock); + if (offset != 2) { + ksft_perror("Offset not forwarded correctly at last byte\n"); + goto out; + } + /* Flush message */ + len = recv(recv_sock, NULL, 2, MSG_TRUNC); + if (len != 2) { + ksft_perror("Failed to flush message\n"); + goto out; + } + offset = tcp_peek_offset_get(recv_sock); + if (offset != 0) { + ksft_perror("Offset not reverted correctly after flush\n"); + goto out; + } + + printf("%s with MSG_PEEK_OFF works correctly\n", afstr(af)); + res = 1; +out: + close(recv_sock); + close(s[1]); + close(s[0]); + return res; +} + +int main(void) +{ + int res4, res6; + + res4 = tcp_peek_offset_probe(AF_INET); + res6 = tcp_peek_offset_probe(AF_INET6); + + if (!res4 && !res6) + return KSFT_SKIP; + + if (res4) + res4 = tcp_peek_offset_test(AF_INET); + + if (res6) + res6 = tcp_peek_offset_test(AF_INET6); + + if (!res4 || !res6) + return KSFT_FAIL; + + return KSFT_PASS; +} +