14606977008

Committed 22 Apr 2025 11:53PM UTC coverage: 72.18% (+0.1%) from 72.043%

Build # 14606977008

Build Type

push

github

Committed by

web-flow

Commit Message

network: enable ARP when IPv4LL and/or IPv4ACD is enabled (#37190)

Coverage Stats

51 of 56 new or added lines in 5 files covered. (91.07%)

1842 existing lines in 57 files now uncovered.

297069 of 411566 relevant lines covered (72.18%)

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81.82

/src/basic/errno-util.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include <inttypes.h>
#include <stdlib.h>
#include <string.h>

#include "assert-util.h"
#include "macro.h"

/* strerror(3) says that glibc uses a maximum length of 1024 bytes. */
#define ERRNO_BUF_LEN 1024

/* Note: the lifetime of the compound literal is the immediately surrounding block,
 * see C11 §6.5.2.5, and
 * https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks
 *
 * Note that we use the GNU variant of strerror_r() here. */
#define STRERROR(errnum) strerror_r(abs(errnum), (char[ERRNO_BUF_LEN]){}, ERRNO_BUF_LEN)

/* A helper to print an error message or message for functions that return 0 on EOF.
 * Note that we can't use ({ … }) to define a temporary variable, so errnum is
 * evaluated twice. */
#define STRERROR_OR_EOF(errnum) ((errnum) != 0 ? STRERROR(errnum) : "Unexpected EOF")

static inline void _reset_errno_(int *saved_errno) {
        if (*saved_errno < 0) /* Invalidated by UNPROTECT_ERRNO? */
                return;

        errno = *saved_errno;
}

#define PROTECT_ERRNO                           \
        _cleanup_(_reset_errno_) _unused_ int _saved_errno_ = errno

#define UNPROTECT_ERRNO                         \
        do {                                    \
                errno = _saved_errno_;          \
                _saved_errno_ = -1;             \
        } while (false)

#define LOCAL_ERRNO(value)                      \
        PROTECT_ERRNO;                          \
        errno = abs(value)

static inline int negative_errno(void) {
        /* This helper should be used to shut up gcc if you know 'errno' is
         * negative. Instead of "return -errno;", use "return negative_errno();"
         * It will suppress bogus gcc warnings in case it assumes 'errno' might
         * be 0 and thus the caller's error-handling might not be triggered. */
        assert_return(errno > 0, -EINVAL);
        return -errno;
}

static inline int RET_NERRNO(int ret) {

        /* Helper to wrap system calls in to make them return negative errno errors. This brings system call
         * error handling in sync with how we usually handle errors in our own code, i.e. with immediate
         * returning of negative errno. Usage is like this:
         *
         *     …
         *     r = RET_NERRNO(unlink(t));
         *     …
         *
         * or
         *
         *     …
         *     fd = RET_NERRNO(open("/etc/fstab", O_RDONLY|O_CLOEXEC));
         *     …
         */

        if (ret < 0)
                return negative_errno();

        return ret;
}

/* Collect possible errors in <acc>, so that the first error can be returned.
 * Returns (possibly updated) <acc>. */
#define RET_GATHER(acc, err)                    \
        ({                                      \
                int *__a = &(acc), __e = (err); \
                if (*__a >= 0 && __e < 0)       \
                        *__a = __e;             \
                *__a;                           \
        })

static inline int errno_or_else(int fallback) {
        /* To be used when invoking library calls where errno handling is not defined clearly: we return
         * errno if it is set, and the specified error otherwise. The idea is that the caller initializes
         * errno to zero before doing an API call, and then uses this helper to retrieve a somewhat useful
         * error code */
        if (errno > 0)
                return -errno;

        return -abs(fallback);
}

/* abs(3) says: Trying to take the absolute value of the most negative integer is not defined. */
#define _DEFINE_ABS_WRAPPER(name)                         \
        static inline bool ERRNO_IS_##name(intmax_t r) {  \
                if (r == INTMAX_MIN)                      \
                        return false;                     \
                return ERRNO_IS_NEG_##name(-imaxabs(r));  \
        }

assert_cc(INT_MAX <= INTMAX_MAX);

/* For send()/recv() or read()/write(). */
static inline bool ERRNO_IS_NEG_TRANSIENT(intmax_t r) {
        return IN_SET(r,
                      -EAGAIN,
                      -EINTR);
}
_DEFINE_ABS_WRAPPER(TRANSIENT);

/* Hint #1: ENETUNREACH happens if we try to connect to "non-existing" special IP addresses, such as ::5.
 *
 * Hint #2: The kernel sends e.g., EHOSTUNREACH or ENONET to userspace in some ICMP error cases.  See the
 *          icmp_err_convert[] in net/ipv4/icmp.c in the kernel sources.
 *
 * Hint #3: When asynchronous connect() on TCP fails because the host never acknowledges a single packet,
 *          kernel tells us that with ETIMEDOUT, see tcp(7). */
static inline bool ERRNO_IS_NEG_DISCONNECT(intmax_t r) {
        return IN_SET(r,
                      -ECONNABORTED,
                      -ECONNREFUSED,
                      -ECONNRESET,
                      -EHOSTDOWN,
                      -EHOSTUNREACH,
                      -ENETDOWN,
                      -ENETRESET,
                      -ENETUNREACH,
                      -ENONET,
                      -ENOPROTOOPT,
                      -ENOTCONN,
                      -EPIPE,
                      -EPROTO,
                      -ESHUTDOWN,
                      -ETIMEDOUT);
}
_DEFINE_ABS_WRAPPER(DISCONNECT);

/* Transient errors we might get on accept() that we should ignore. As per error handling comment in
 * the accept(2) man page. */
static inline bool ERRNO_IS_NEG_ACCEPT_AGAIN(intmax_t r) {
        return ERRNO_IS_NEG_DISCONNECT(r) ||
                ERRNO_IS_NEG_TRANSIENT(r) ||
                r == -EOPNOTSUPP;
}
_DEFINE_ABS_WRAPPER(ACCEPT_AGAIN);

/* Resource exhaustion, could be our fault or general system trouble */
static inline bool ERRNO_IS_NEG_RESOURCE(intmax_t r) {
        return IN_SET(r,
                      -EMFILE,
                      -ENFILE,
                      -ENOMEM);
}
_DEFINE_ABS_WRAPPER(RESOURCE);

/* Seven different errors for "operation/system call/socket feature not supported" */
static inline bool ERRNO_IS_NEG_NOT_SUPPORTED(intmax_t r) {
        return IN_SET(r,
                      -EOPNOTSUPP,
                      -ENOTTY,
                      -ENOSYS,
                      -EAFNOSUPPORT,
                      -EPFNOSUPPORT,
                      -EPROTONOSUPPORT,
                      -ESOCKTNOSUPPORT,
                      -ENOPROTOOPT);
}
_DEFINE_ABS_WRAPPER(NOT_SUPPORTED);

/* ioctl() with unsupported command/arg might additionally return EINVAL */
static inline bool ERRNO_IS_NEG_IOCTL_NOT_SUPPORTED(intmax_t r) {
        return ERRNO_IS_NEG_NOT_SUPPORTED(r) || r == -EINVAL;
}
_DEFINE_ABS_WRAPPER(IOCTL_NOT_SUPPORTED);

/* Two different errors for access problems */
static inline bool ERRNO_IS_NEG_PRIVILEGE(intmax_t r) {
        return IN_SET(r,
                      -EACCES,
                      -EPERM);
}
_DEFINE_ABS_WRAPPER(PRIVILEGE);

/* Three different errors for "not enough disk space" */
static inline bool ERRNO_IS_NEG_DISK_SPACE(intmax_t r) {
        return IN_SET(r,
                      -ENOSPC,
                      -EDQUOT,
                      -EFBIG);
}
_DEFINE_ABS_WRAPPER(DISK_SPACE);

/* Three different errors for "this device does not quite exist" */
static inline bool ERRNO_IS_NEG_DEVICE_ABSENT(intmax_t r) {
        return IN_SET(r,
                      -ENODEV,
                      -ENXIO,
                      -ENOENT);
}
_DEFINE_ABS_WRAPPER(DEVICE_ABSENT);

/* Quite often we want to handle cases where the backing FS doesn't support extended attributes at all and
 * where it simply doesn't have the requested xattr the same way */
static inline bool ERRNO_IS_NEG_XATTR_ABSENT(intmax_t r) {
        return r == -ENODATA ||
                ERRNO_IS_NEG_NOT_SUPPORTED(r);
}
_DEFINE_ABS_WRAPPER(XATTR_ABSENT);

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2	#pragma once
3
4	#include <inttypes.h>
5	#include <stdlib.h>
6	#include <string.h>
7
8	#include "assert-util.h"
9	#include "macro.h"
10
11	/* strerror(3) says that glibc uses a maximum length of 1024 bytes. */
12	#define ERRNO_BUF_LEN 1024
13
14	/* Note: the lifetime of the compound literal is the immediately surrounding block,
15	* see C11 §6.5.2.5, and
16	* https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks
17	*
18	* Note that we use the GNU variant of strerror_r() here. */
19	#define STRERROR(errnum) strerror_r(abs(errnum), (char[ERRNO_BUF_LEN]){}, ERRNO_BUF_LEN)
20
21	/* A helper to print an error message or message for functions that return 0 on EOF.
22	* Note that we can't use ({ … }) to define a temporary variable, so errnum is
23	* evaluated twice. */
24	#define STRERROR_OR_EOF(errnum) ((errnum) != 0 ? STRERROR(errnum) : "Unexpected EOF")
25
26	static inline void _reset_errno_(int *saved_errno) {	69,559,530✔
27	if (saved_errno < 0) / Invalidated by UNPROTECT_ERRNO? */	69,559,530✔
28	return;
29
30	errno = *saved_errno;	69,552,771✔
31	}
32
33	#define PROTECT_ERRNO \
34	_cleanup_(_reset_errno_) _unused_ int _saved_errno_ = errno
35
36	#define UNPROTECT_ERRNO \
37	do { \
38	errno = _saved_errno_; \
39	_saved_errno_ = -1; \
40	} while (false)
41
42	#define LOCAL_ERRNO(value) \
43	PROTECT_ERRNO; \
44	errno = abs(value)
45
46	static inline int negative_errno(void) {	2,599,338✔
47	/* This helper should be used to shut up gcc if you know 'errno' is
48	* negative. Instead of "return -errno;", use "return negative_errno();"
49	* It will suppress bogus gcc warnings in case it assumes 'errno' might
50	* be 0 and thus the caller's error-handling might not be triggered. */
51	assert_return(errno > 0, -EINVAL);	2,599,338✔
52	return -errno;	2,599,338✔
53	}
54
55	static inline int RET_NERRNO(int ret) {	37,808,988✔
56
57	/* Helper to wrap system calls in to make them return negative errno errors. This brings system call
58	* error handling in sync with how we usually handle errors in our own code, i.e. with immediate
59	* returning of negative errno. Usage is like this:
60	*
61	* …
62	* r = RET_NERRNO(unlink(t));
63	* …
64	*
65	* or
66	*
67	* …
68	* fd = RET_NERRNO(open("/etc/fstab", O_RDONLY\|O_CLOEXEC));
69	* …
70	*/
71
72	if (ret < 0)	37,809,345✔
73	return negative_errno();	2,599,278✔
74
75	return ret;
76	}
77
78	/* Collect possible errors in <acc>, so that the first error can be returned.
79	* Returns (possibly updated) <acc>. */
80	#define RET_GATHER(acc, err) \
81	({ \
82	int *__a = &(acc), __e = (err); \
83	if (*__a >= 0 && __e < 0) \
84	*__a = __e; \
85	*__a; \
86	})
87
88	static inline int errno_or_else(int fallback) {	71,180✔
89	/* To be used when invoking library calls where errno handling is not defined clearly: we return
90	* errno if it is set, and the specified error otherwise. The idea is that the caller initializes
91	* errno to zero before doing an API call, and then uses this helper to retrieve a somewhat useful
92	* error code */
93	if (errno > 0)	71,180✔
94	return -errno;	24✔
95
96	return -abs(fallback);
97	}
98
99	/* abs(3) says: Trying to take the absolute value of the most negative integer is not defined. */
100	#define _DEFINE_ABS_WRAPPER(name) \
101	static inline bool ERRNO_IS_##name(intmax_t r) { \
102	if (r == INTMAX_MIN) \
103	return false; \
104	return ERRNO_IS_NEG_##name(-imaxabs(r)); \
105	}
106
107	assert_cc(INT_MAX <= INTMAX_MAX);
108
109	/* For send()/recv() or read()/write(). */
110	static inline bool ERRNO_IS_NEG_TRANSIENT(intmax_t r) {	3,336,684✔
111	return IN_SET(r,	3,391,796✔
112	-EAGAIN,
113	-EINTR);
114	}
115	_DEFINE_ABS_WRAPPER(TRANSIENT);	5,913✔
116
117	/* Hint #1: ENETUNREACH happens if we try to connect to "non-existing" special IP addresses, such as ::5.
118	*
119	* Hint #2: The kernel sends e.g., EHOSTUNREACH or ENONET to userspace in some ICMP error cases. See the
120	* icmp_err_convert[] in net/ipv4/icmp.c in the kernel sources.
121	*
122	* Hint #3: When asynchronous connect() on TCP fails because the host never acknowledges a single packet,
123	* kernel tells us that with ETIMEDOUT, see tcp(7). */
124	static inline bool ERRNO_IS_NEG_DISCONNECT(intmax_t r) {	547,511✔
125	return IN_SET(r,	547,511✔
126	-ECONNABORTED,
127	-ECONNREFUSED,
128	-ECONNRESET,
129	-EHOSTDOWN,
130	-EHOSTUNREACH,
131	-ENETDOWN,
132	-ENETRESET,
133	-ENETUNREACH,
134	-ENONET,
135	-ENOPROTOOPT,
136	-ENOTCONN,
137	-EPIPE,
138	-EPROTO,
139	-ESHUTDOWN,
140	-ETIMEDOUT);
141	}
142	_DEFINE_ABS_WRAPPER(DISCONNECT);	2,644✔
143
144	/* Transient errors we might get on accept() that we should ignore. As per error handling comment in
145	* the accept(2) man page. */
146	static inline bool ERRNO_IS_NEG_ACCEPT_AGAIN(intmax_t r) {	×
147	return ERRNO_IS_NEG_DISCONNECT(r) \|\|	×
148	ERRNO_IS_NEG_TRANSIENT(r) \|\|	×
149	r == -EOPNOTSUPP;
150	}
151	_DEFINE_ABS_WRAPPER(ACCEPT_AGAIN);	×
152
153	/* Resource exhaustion, could be our fault or general system trouble */
154	static inline bool ERRNO_IS_NEG_RESOURCE(intmax_t r) {	1,300✔
155	return IN_SET(r,	2,588✔
156	-EMFILE,
157	-ENFILE,
158	-ENOMEM);
159	}
UNCOV 160	_DEFINE_ABS_WRAPPER(RESOURCE);	×
161
162	/* Seven different errors for "operation/system call/socket feature not supported" */
163	static inline bool ERRNO_IS_NEG_NOT_SUPPORTED(intmax_t r) {	306,111✔
164	return IN_SET(r,	295,433✔
165	-EOPNOTSUPP,
166	-ENOTTY,
167	-ENOSYS,
168	-EAFNOSUPPORT,
169	-EPFNOSUPPORT,
170	-EPROTONOSUPPORT,
171	-ESOCKTNOSUPPORT,
172	-ENOPROTOOPT);
173	}
174	_DEFINE_ABS_WRAPPER(NOT_SUPPORTED);	213,591✔
175
176	/* ioctl() with unsupported command/arg might additionally return EINVAL */
177	static inline bool ERRNO_IS_NEG_IOCTL_NOT_SUPPORTED(intmax_t r) {	1,566✔
178	return ERRNO_IS_NEG_NOT_SUPPORTED(r) \|\| r == -EINVAL;	1,566✔
179	}
180	_DEFINE_ABS_WRAPPER(IOCTL_NOT_SUPPORTED);	1,566✔
181
182	/* Two different errors for access problems */
183	static inline bool ERRNO_IS_NEG_PRIVILEGE(intmax_t r) {	678,405✔
184	return IN_SET(r,	667,834✔
185	-EACCES,
186	-EPERM);
187	}
188	_DEFINE_ABS_WRAPPER(PRIVILEGE);	11,562✔
189
190	/* Three different errors for "not enough disk space" */
191	static inline bool ERRNO_IS_NEG_DISK_SPACE(intmax_t r) {	×
192	return IN_SET(r,	×
193	-ENOSPC,
194	-EDQUOT,
195	-EFBIG);
196	}
197	_DEFINE_ABS_WRAPPER(DISK_SPACE);	×
198
199	/* Three different errors for "this device does not quite exist" */
200	static inline bool ERRNO_IS_NEG_DEVICE_ABSENT(intmax_t r) {	1,134,979✔
201	return IN_SET(r,	1,299,655✔
202	-ENODEV,
203	-ENXIO,
204	-ENOENT);
205	}
206	_DEFINE_ABS_WRAPPER(DEVICE_ABSENT);	119,483✔
207
208	/* Quite often we want to handle cases where the backing FS doesn't support extended attributes at all and
209	* where it simply doesn't have the requested xattr the same way */
210	static inline bool ERRNO_IS_NEG_XATTR_ABSENT(intmax_t r) {	41,710✔
211	return r == -ENODATA \|\|	41,710✔
212	ERRNO_IS_NEG_NOT_SUPPORTED(r);	41,710✔
213	}
214	_DEFINE_ABS_WRAPPER(XATTR_ABSENT);	31,726✔

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