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bpf, sockmap: Pull socket helpers out of listen test for general use
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No functional change here we merely pull the helpers in sockmap_listen.c
into a header file so we can use these in other programs. The tests we
are about to add aren't really _listen tests so doesn't make sense
to add them here.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/20230523025618.113937-10-john.fastabend@gmail.com
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John Fastabend authored and Daniel Borkmann committed May 23, 2023
1 parent e5c6de5 commit 4e02588
Showing 2 changed files with 273 additions and 262 deletions.
272 changes: 272 additions & 0 deletions tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h
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#ifndef __SOCKMAP_HELPERS__
#define __SOCKMAP_HELPERS__

#include <linux/vm_sockets.h>

#define IO_TIMEOUT_SEC 30
#define MAX_STRERR_LEN 256
#define MAX_TEST_NAME 80

/* workaround for older vm_sockets.h */
#ifndef VMADDR_CID_LOCAL
#define VMADDR_CID_LOCAL 1
#endif

#define __always_unused __attribute__((__unused__))

#define _FAIL(errnum, fmt...) \
({ \
error_at_line(0, (errnum), __func__, __LINE__, fmt); \
CHECK_FAIL(true); \
})
#define FAIL(fmt...) _FAIL(0, fmt)
#define FAIL_ERRNO(fmt...) _FAIL(errno, fmt)
#define FAIL_LIBBPF(err, msg) \
({ \
char __buf[MAX_STRERR_LEN]; \
libbpf_strerror((err), __buf, sizeof(__buf)); \
FAIL("%s: %s", (msg), __buf); \
})

/* Wrappers that fail the test on error and report it. */

#define xaccept_nonblock(fd, addr, len) \
({ \
int __ret = \
accept_timeout((fd), (addr), (len), IO_TIMEOUT_SEC); \
if (__ret == -1) \
FAIL_ERRNO("accept"); \
__ret; \
})

#define xbind(fd, addr, len) \
({ \
int __ret = bind((fd), (addr), (len)); \
if (__ret == -1) \
FAIL_ERRNO("bind"); \
__ret; \
})

#define xclose(fd) \
({ \
int __ret = close((fd)); \
if (__ret == -1) \
FAIL_ERRNO("close"); \
__ret; \
})

#define xconnect(fd, addr, len) \
({ \
int __ret = connect((fd), (addr), (len)); \
if (__ret == -1) \
FAIL_ERRNO("connect"); \
__ret; \
})

#define xgetsockname(fd, addr, len) \
({ \
int __ret = getsockname((fd), (addr), (len)); \
if (__ret == -1) \
FAIL_ERRNO("getsockname"); \
__ret; \
})

#define xgetsockopt(fd, level, name, val, len) \
({ \
int __ret = getsockopt((fd), (level), (name), (val), (len)); \
if (__ret == -1) \
FAIL_ERRNO("getsockopt(" #name ")"); \
__ret; \
})

#define xlisten(fd, backlog) \
({ \
int __ret = listen((fd), (backlog)); \
if (__ret == -1) \
FAIL_ERRNO("listen"); \
__ret; \
})

#define xsetsockopt(fd, level, name, val, len) \
({ \
int __ret = setsockopt((fd), (level), (name), (val), (len)); \
if (__ret == -1) \
FAIL_ERRNO("setsockopt(" #name ")"); \
__ret; \
})

#define xsend(fd, buf, len, flags) \
({ \
ssize_t __ret = send((fd), (buf), (len), (flags)); \
if (__ret == -1) \
FAIL_ERRNO("send"); \
__ret; \
})

#define xrecv_nonblock(fd, buf, len, flags) \
({ \
ssize_t __ret = recv_timeout((fd), (buf), (len), (flags), \
IO_TIMEOUT_SEC); \
if (__ret == -1) \
FAIL_ERRNO("recv"); \
__ret; \
})

#define xsocket(family, sotype, flags) \
({ \
int __ret = socket(family, sotype, flags); \
if (__ret == -1) \
FAIL_ERRNO("socket"); \
__ret; \
})

#define xbpf_map_delete_elem(fd, key) \
({ \
int __ret = bpf_map_delete_elem((fd), (key)); \
if (__ret < 0) \
FAIL_ERRNO("map_delete"); \
__ret; \
})

#define xbpf_map_lookup_elem(fd, key, val) \
({ \
int __ret = bpf_map_lookup_elem((fd), (key), (val)); \
if (__ret < 0) \
FAIL_ERRNO("map_lookup"); \
__ret; \
})

#define xbpf_map_update_elem(fd, key, val, flags) \
({ \
int __ret = bpf_map_update_elem((fd), (key), (val), (flags)); \
if (__ret < 0) \
FAIL_ERRNO("map_update"); \
__ret; \
})

#define xbpf_prog_attach(prog, target, type, flags) \
({ \
int __ret = \
bpf_prog_attach((prog), (target), (type), (flags)); \
if (__ret < 0) \
FAIL_ERRNO("prog_attach(" #type ")"); \
__ret; \
})

#define xbpf_prog_detach2(prog, target, type) \
({ \
int __ret = bpf_prog_detach2((prog), (target), (type)); \
if (__ret < 0) \
FAIL_ERRNO("prog_detach2(" #type ")"); \
__ret; \
})

#define xpthread_create(thread, attr, func, arg) \
({ \
int __ret = pthread_create((thread), (attr), (func), (arg)); \
errno = __ret; \
if (__ret) \
FAIL_ERRNO("pthread_create"); \
__ret; \
})

#define xpthread_join(thread, retval) \
({ \
int __ret = pthread_join((thread), (retval)); \
errno = __ret; \
if (__ret) \
FAIL_ERRNO("pthread_join"); \
__ret; \
})

static inline int poll_read(int fd, unsigned int timeout_sec)
{
struct timeval timeout = { .tv_sec = timeout_sec };
fd_set rfds;
int r;

FD_ZERO(&rfds);
FD_SET(fd, &rfds);

r = select(fd + 1, &rfds, NULL, NULL, &timeout);
if (r == 0)
errno = ETIME;

return r == 1 ? 0 : -1;
}

static inline int accept_timeout(int fd, struct sockaddr *addr, socklen_t *len,
unsigned int timeout_sec)
{
if (poll_read(fd, timeout_sec))
return -1;

return accept(fd, addr, len);
}

static inline int recv_timeout(int fd, void *buf, size_t len, int flags,
unsigned int timeout_sec)
{
if (poll_read(fd, timeout_sec))
return -1;

return recv(fd, buf, len, flags);
}

static inline void init_addr_loopback4(struct sockaddr_storage *ss,
socklen_t *len)
{
struct sockaddr_in *addr4 = memset(ss, 0, sizeof(*ss));

addr4->sin_family = AF_INET;
addr4->sin_port = 0;
addr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
*len = sizeof(*addr4);
}

static inline void init_addr_loopback6(struct sockaddr_storage *ss,
socklen_t *len)
{
struct sockaddr_in6 *addr6 = memset(ss, 0, sizeof(*ss));

addr6->sin6_family = AF_INET6;
addr6->sin6_port = 0;
addr6->sin6_addr = in6addr_loopback;
*len = sizeof(*addr6);
}

static inline void init_addr_loopback_vsock(struct sockaddr_storage *ss,
socklen_t *len)
{
struct sockaddr_vm *addr = memset(ss, 0, sizeof(*ss));

addr->svm_family = AF_VSOCK;
addr->svm_port = VMADDR_PORT_ANY;
addr->svm_cid = VMADDR_CID_LOCAL;
*len = sizeof(*addr);
}

static inline void init_addr_loopback(int family, struct sockaddr_storage *ss,
socklen_t *len)
{
switch (family) {
case AF_INET:
init_addr_loopback4(ss, len);
return;
case AF_INET6:
init_addr_loopback6(ss, len);
return;
case AF_VSOCK:
init_addr_loopback_vsock(ss, len);
return;
default:
FAIL("unsupported address family %d", family);
}
}

static inline struct sockaddr *sockaddr(struct sockaddr_storage *ss)
{
return (struct sockaddr *)ss;
}

#endif // __SOCKMAP_HELPERS__
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