diff options
Diffstat (limited to 'util.h')
| -rw-r--r-- | util.h | 228 |
1 files changed, 147 insertions, 81 deletions
@@ -6,49 +6,29 @@ #ifndef UTIL_H #define UTIL_H +#include <assert.h> #include <stdlib.h> #include <stdarg.h> #include <stdbool.h> +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> #include <string.h> #include <signal.h> +#include <arpa/inet.h> +#include <unistd.h> +#include <sys/syscall.h> +#include <net/ethernet.h> +#include "common.h" #include "log.h" -#define VERSION_BLOB \ - VERSION "\n" \ - "Copyright Red Hat\n" \ - "GNU General Public License, version 2 or later\n" \ - " <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>\n" \ - "This is free software: you are free to change and redistribute it.\n" \ - "There is NO WARRANTY, to the extent permitted by law.\n\n" - #ifndef SECCOMP_RET_KILL_PROCESS #define SECCOMP_RET_KILL_PROCESS SECCOMP_RET_KILL #endif -#ifndef ETH_MAX_MTU -#define ETH_MAX_MTU USHRT_MAX +#ifndef IP_MAX_MTU +#define IP_MAX_MTU USHRT_MAX #endif -#ifndef ETH_MIN_MTU -#define ETH_MIN_MTU 68 -#endif - -#ifndef MIN -#define MIN(x, y) (((x) < (y)) ? (x) : (y)) -#endif -#ifndef MAX -#define MAX(x, y) (((x) > (y)) ? (x) : (y)) -#endif - -#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) -#define DIV_ROUND_CLOSEST(n, d) (((n) + (d) / 2) / (d)) -#define ROUND_DOWN(x, y) ((x) & ~((y) - 1)) -#define ROUND_UP(x, y) (((x) + (y) - 1) & ~((y) - 1)) - -#define MAX_FROM_BITS(n) (((1U << (n)) - 1)) - -#define BIT(n) (1UL << (n)) -#define BITMAP_BIT(n) (BIT((n) % (sizeof(long) * 8))) -#define BITMAP_WORD(n) (n / (sizeof(long) * 8)) #define SWAP(a, b) \ do { \ @@ -58,17 +38,31 @@ #define STRINGIFY(x) #x #define STR(x) STRINGIFY(x) -#define ASSERT(expr) \ - do { \ - if (!(expr)) { \ - err("ASSERTION FAILED in %s (%s:%d): %s", \ - __func__, __FILE__, __LINE__, STRINGIFY(expr)); \ - /* This may actually SIGSYS, due to seccomp, \ - * but that will still get the job done \ - */ \ - abort(); \ - } \ - } while (0) +void abort_with_msg(const char *fmt, ...) + __attribute__((format(printf, 1, 2), noreturn)); + +/* Some cppcheck versions get confused by aborts inside a loop, causing + * it to give false positive uninitialised variable warnings later in + * the function, because it doesn't realise the non-initialising path + * already exited. See https://trac.cppcheck.net/ticket/13227 + * + * Therefore, avoid using the usual do while wrapper we use to force the macro + * to act like a single statement requiring a ';'. + */ +#ifndef NDEBUG +#define assert_with_msg(expr, ...) \ + (1 ? (void)0 : ((void)(expr), abort_with_msg(__VA_ARGS__))) +/* The standard library assert() hits our seccomp filter and dies before it can + * actually print a message. So, replace it with our own version. + */ +#undef assert +#define assert(expr) \ + assert_with_msg((expr), "ASSERTION FAILED in %s (%s:%d): %s", \ + __func__, __FILE__, __LINE__, STRINGIFY(expr)) +#else +#define assert_with_msg(expr, ...) \ + ((void)(expr), 1 ? (void)0 : abort_with_msg(__VA_ARGS__)) +#endif #ifdef P_tmpdir #define TMPDIR P_tmpdir @@ -80,81 +74,138 @@ #define V6 1 #define IP_VERSIONS 2 -#define ARRAY_SIZE(a) ((int)(sizeof(a) / sizeof((a)[0]))) +#define foreach(item, array) \ + for ((item) = (array); (item) - (array) < ARRAY_SIZE(array); (item)++) #define IN_INTERVAL(a, b, x) ((x) >= (a) && (x) <= (b)) #define FD_PROTO(x, proto) \ (IN_INTERVAL(c->proto.fd_min, c->proto.fd_max, (x))) -#define PORT_EPHEMERAL_MIN ((1 << 15) + (1 << 14)) /* RFC 6335 */ -#define PORT_IS_EPHEMERAL(port) ((port) >= PORT_EPHEMERAL_MIN) - +#define MAC_BROADCAST \ + ((uint8_t [ETH_ALEN]){ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }) #define MAC_ZERO ((uint8_t [ETH_ALEN]){ 0 }) #define MAC_IS_ZERO(addr) (!memcmp((addr), MAC_ZERO, ETH_ALEN)) +#define MAC_UNDEF MAC_BROADCAST +#define MAC_IS_UNDEF(addr) (!memcmp((addr), MAC_UNDEF, ETH_ALEN)) -#ifndef __bswap_constant_16 -#define __bswap_constant_16(x) \ - ((uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))) -#endif +extern uint8_t eth_pad[ETH_ZLEN]; -#ifndef __bswap_constant_32 -#define __bswap_constant_32(x) \ - ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ - (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) -#endif +/** + * ntohl_unaligned() - Read 32-bit BE value from a possibly unaligned address + * @p: Pointer to the BE value in memory + * + * Return: host-order value of 32-bit BE quantity at @p + */ +static inline uint32_t ntohl_unaligned(const void *p) +{ + uint32_t val; -#if __BYTE_ORDER == __BIG_ENDIAN -#define htons_constant(x) (x) -#define htonl_constant(x) (x) -#else -#define htons_constant(x) (__bswap_constant_16(x)) -#define htonl_constant(x) (__bswap_constant_32(x)) -#endif + memcpy(&val, p, sizeof(val)); + return ntohl(val); +} + +static inline void barrier(void) { __asm__ __volatile__("" ::: "memory"); } +#define smp_mb() do { barrier(); __atomic_thread_fence(__ATOMIC_SEQ_CST); } while (0) +#define smp_mb_release() do { barrier(); __atomic_thread_fence(__ATOMIC_RELEASE); } while (0) +#define smp_mb_acquire() do { barrier(); __atomic_thread_fence(__ATOMIC_ACQUIRE); } while (0) + +#define smp_wmb() smp_mb_release() +#define smp_rmb() smp_mb_acquire() + +#define qatomic_or(ptr, n) \ + ((void) __atomic_fetch_or(ptr, n, __ATOMIC_SEQ_CST)) + +#define NS_FN_STACK_SIZE (1024 * 1024) /* 1MiB */ -#define NS_FN_STACK_SIZE (RLIMIT_STACK_VAL * 1024 / 8) int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags, void *arg); #define NS_CALL(fn, arg) \ do { \ - char ns_fn_stack[NS_FN_STACK_SIZE]; \ + char ns_fn_stack[NS_FN_STACK_SIZE] \ + __attribute__ ((aligned(__alignof__(max_align_t)))); \ \ do_clone((fn), ns_fn_stack, sizeof(ns_fn_stack), \ CLONE_VM | CLONE_VFORK | CLONE_FILES | SIGCHLD,\ (void *)(arg)); \ } while (0) -#define RCVBUF_BIG (2UL * 1024 * 1024) -#define SNDBUF_BIG (4UL * 1024 * 1024) -#define SNDBUF_SMALL (128UL * 1024) +#define RCVBUF_BIG (2ULL * 1024 * 1024) +#define SNDBUF_BIG (4ULL * 1024 * 1024) +#define SNDBUF_SMALL (128ULL * 1024) + +#define FD_REF_BITS 24 +#define FD_REF_MAX ((int)MAX_FROM_BITS(FD_REF_BITS)) #include <net/if.h> #include <limits.h> #include <stdint.h> +#include "epoll_type.h" #include "packet.h" struct ctx; - -/* cppcheck-suppress funcArgNamesDifferent */ -__attribute__ ((weak)) int ffsl(long int i) { return __builtin_ffsl(i); } -int sock_l4(const struct ctx *c, sa_family_t af, uint8_t proto, - const void *bind_addr, const char *ifname, uint16_t port, - uint32_t data); -void sock_probe_mem(struct ctx *c); -int timespec_diff_ms(const struct timespec *a, const struct timespec *b); -void bitmap_set(uint8_t *map, int bit); -void bitmap_clear(uint8_t *map, int bit); -int bitmap_isset(const uint8_t *map, int bit); -void bitmap_or(uint8_t *dst, size_t size, const uint8_t *a, const uint8_t *b); +union sockaddr_inany; + +int sock_l4(const struct ctx *c, enum epoll_type type, + const union sockaddr_inany *sa, const char *ifname); +int sock_l4_dualstack_any(const struct ctx *c, enum epoll_type type, + in_port_t port, const char *ifname); +int sock_unix(char *sock_path); +void sock_probe_features(struct ctx *c); +long timespec_diff_ms(const struct timespec *a, const struct timespec *b); +int64_t timespec_diff_us(const struct timespec *a, const struct timespec *b); char *line_read(char *buf, size_t len, int fd); void ns_enter(const struct ctx *c); bool ns_is_init(void); int open_in_ns(const struct ctx *c, const char *path, int flags); -void write_pidfile(int fd, pid_t pid); +int output_file_open(const char *path, int flags); +void pidfile_write(int fd, pid_t pid); int __daemon(int pidfile_fd, int devnull_fd); int fls(unsigned long x); +int ilog2(unsigned long x); int write_file(const char *path, const char *buf); -int write_remainder(int fd, const struct iovec *iov, int iovcnt, size_t skip); +intmax_t read_file_integer(const char *path, intmax_t fallback); +int write_remainder(int fd, const struct iovec *iov, size_t iovcnt, size_t skip); +int read_remainder(int fd, const struct iovec *iov, size_t cnt, size_t skip); +void close_open_files(int argc, char **argv); +bool snprintf_check(char *str, size_t size, const char *format, ...); +long clamped_scale(long x, long y, long lo, long hi, long f); + +/** + * af_name() - Return name of an address family + * @af: Address/protocol family (AF_INET or AF_INET6) + * + * Return: name of the protocol family as a string + */ +static inline const char *af_name(sa_family_t af) +{ + switch (af) { + case AF_INET: + return "IPv4"; + case AF_INET6: + return "IPv6"; + default: + return "<unknown address family>"; + } +} + +/* inet address (- '\0') + port (u16) (- '\0') + ':' + '\0' */ +#define SOCKADDR_INET_STRLEN \ + (INET_ADDRSTRLEN-1 + UINT16_STRLEN-1 + sizeof(":")) + +/* inet6 address (- '\0') + port (u16) (- '\0') + '[' + ']' + ':' + '\0' */ +#define SOCKADDR_INET6_STRLEN \ + (INET6_ADDRSTRLEN-1 + UINT16_STRLEN-1 + sizeof("[]:")) + +#define SOCKADDR_STRLEN MAX(SOCKADDR_INET_STRLEN, SOCKADDR_INET6_STRLEN) + +#define ETH_ADDRSTRLEN (sizeof("00:11:22:33:44:55")) + +struct sock_extended_err; + +const char *sockaddr_ntop(const void *sa, char *dst, socklen_t size); +const char *eth_ntop(const unsigned char *mac, char *dst, size_t size); +const char *str_ee_origin(const struct sock_extended_err *ee); /** * mod_sub() - Modular arithmetic subtraction @@ -184,6 +235,8 @@ static inline bool mod_between(unsigned x, unsigned i, unsigned j, unsigned m) return mod_sub(x, i, m) < mod_sub(j, i, m); } +void raw_random(void *buf, size_t buflen); + /* * Workarounds for https://github.com/llvm/llvm-project/issues/58992 * @@ -224,4 +277,17 @@ static inline int wrap_accept4(int sockfd, struct sockaddr *addr, #define accept4(s, addr, addrlen, flags) \ wrap_accept4((s), (addr), (addrlen), (flags)) +static inline int wrap_getsockname(int sockfd, struct sockaddr *addr, +/* cppcheck-suppress constParameterPointer */ + socklen_t *addrlen) +{ + sa_init(addr, addrlen); + return getsockname(sockfd, addr, addrlen); +} +#define getsockname(s, addr, addrlen) \ + wrap_getsockname((s), (addr), (addrlen)) + +#define PASST_MAXDNAME 254 /* 253 (RFC 1035) + 1 (the terminator) */ +void encode_domain_name(char *buf, const char *domain_name); + #endif /* UTIL_H */ |