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void err(const char *format, ...);
void warn(const char *format, ...);
void info(const char *format, ...);
#ifdef DEBUG
void debug(const char *format, ...);
#else
#define debug(...) { }
#endif
#define CHECK_SET_MIN_MAX(basename, fd) \
do { \
if ((fd) < basename##min) \
basename##min = (fd); \
if ((fd) > basename##max) \
basename##max = (fd); \
} while (0)
#define CHECK_SET_MIN_MAX_PROTO_FD(proto, ipproto, proto_ctx, fd) \
do { \
if ((proto) == (ipproto)) \
CHECK_SET_MIN_MAX(c->proto_ctx.fd_, (fd)); \
} while (0)
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
#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_IS_EPHEMERAL(port) ((port) >= (1 << 15) + (1 << 14)) /* RFC 6335 */
uint16_t csum_fold(uint32_t sum);
uint16_t csum_ip4(void *buf, size_t len);
void csum_tcp4(struct iphdr *iph);
char *ipv6_l4hdr(struct ipv6hdr *ip6h, uint8_t *proto);
int sock_l4(struct ctx *c, int af, uint16_t proto, uint16_t port);
int timespec_diff_ms(struct timespec *a, struct timespec *b);
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