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meson
ping.h
399 строк
11 KB
Jan Synacek
ping: fix pmtu discovery for ipv6
15 май 2017, 13:08
15 май 2017, 13:08
f3c189e
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#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <time.h> #include <signal.h> #include <poll.h> #include <sys/param.h> #include <sys/socket.h> #include <linux/types.h> #include <linux/sockios.h> #include <sys/file.h> #include <sys/time.h> #include <sys/ioctl.h> #include <net/if.h> #include <sys/uio.h> #include <ctype.h> #include <errno.h> #include <string.h> #include <netdb.h> #include <setjmp.h> #include <netinet/icmp6.h> #include <asm/byteorder.h> #include <sched.h> #include <math.h> #include <netinet/ip.h> #include <netinet/ip6.h> #include <netinet/ip_icmp.h> #include <netinet/icmp6.h> #include <linux/filter.h> #include <resolv.h> #ifdef CAPABILITIES #include <sys/prctl.h> #include <sys/capability.h> #endif #ifdef USE_IDN #include <locale.h> #include <idna.h> #include <stringprep.h> #define getaddrinfo_flags (AI_CANONNAME | AI_IDN | AI_CANONIDN) #define getnameinfo_flags NI_IDN #else #define getaddrinfo_flags (AI_CANONNAME) #define getnameinfo_flags 0 #endif #ifndef WITHOUT_IFADDRS #include <ifaddrs.h> #endif #include <netinet/in.h> #include <arpa/inet.h> #include <linux/types.h> #include <linux/errqueue.h> #include "in6_flowlabel.h" #include "SNAPSHOT.h" #ifndef SCOPE_DELIMITER #define SCOPE_DELIMITER '%' #endif #define DEFDATALEN (64 - 8) /* default data length */ #define MAXWAIT 10 /* max seconds to wait for response */ #define MININTERVAL 10 /* Minimal interpacket gap */ #define MINUSERINTERVAL 200 /* Minimal allowed interval for non-root */ #define SCHINT(a) (((a) <= MININTERVAL) ? MININTERVAL : (a)) /* various options */ extern int options; #define F_FLOOD 0x001 #define F_INTERVAL 0x002 #define F_NUMERIC 0x004 #define F_PINGFILLED 0x008 #define F_QUIET 0x010 #define F_RROUTE 0x020 #define F_SO_DEBUG 0x040 #define F_SO_DONTROUTE 0x080 #define F_VERBOSE 0x100 #define F_TIMESTAMP 0x200 #define F_FLOWINFO 0x200 #define F_SOURCEROUTE 0x400 #define F_TCLASS 0x400 #define F_FLOOD_POLL 0x800 #define F_LATENCY 0x1000 #define F_AUDIBLE 0x2000 #define F_ADAPTIVE 0x4000 #define F_STRICTSOURCE 0x8000 #define F_NOLOOP 0x10000 #define F_TTL 0x20000 #define F_MARK 0x40000 #define F_PTIMEOFDAY 0x80000 #define F_OUTSTANDING 0x100000 /* * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum * number of received sequence numbers we can keep track of. */ #define MAX_DUP_CHK 0x10000 #if defined(__WORDSIZE) && __WORDSIZE == 64 # define USE_BITMAP64 #endif #ifdef USE_BITMAP64 typedef __u64 bitmap_t; # define BITMAP_SHIFT 6 #else typedef __u32 bitmap_t; # define BITMAP_SHIFT 5 #endif #if ((MAX_DUP_CHK >> (BITMAP_SHIFT + 3)) << (BITMAP_SHIFT + 3)) != MAX_DUP_CHK # error Please MAX_DUP_CHK and/or BITMAP_SHIFT #endif struct rcvd_table { bitmap_t bitmap[MAX_DUP_CHK / (sizeof(bitmap_t) * 8)]; }; extern struct rcvd_table rcvd_tbl; #define A(bit) (rcvd_tbl.bitmap[(bit) >> BITMAP_SHIFT]) /* identify word in array */ #define B(bit) (((bitmap_t)1) << ((bit) & ((1 << BITMAP_SHIFT) - 1))) /* identify bit in word */ static inline void rcvd_set(__u16 seq) { unsigned bit = seq % MAX_DUP_CHK; A(bit) |= B(bit); } static inline void rcvd_clear(__u16 seq) { unsigned bit = seq % MAX_DUP_CHK; A(bit) &= ~B(bit); } static inline bitmap_t rcvd_test(__u16 seq) { unsigned bit = seq % MAX_DUP_CHK; return A(bit) & B(bit); } extern int datalen; extern char *hostname; extern int uid; extern int ident; /* process id to identify our packets */ extern int sndbuf; extern int ttl; extern long npackets; /* max packets to transmit */ extern long nreceived; /* # of packets we got back */ extern long nrepeats; /* number of duplicates */ extern long ntransmitted; /* sequence # for outbound packets = #sent */ extern long nchecksum; /* replies with bad checksum */ extern long nerrors; /* icmp errors */ extern int interval; /* interval between packets (msec) */ extern int preload; extern int deadline; /* time to die */ extern int lingertime; extern struct timeval start_time, cur_time; extern volatile int exiting; extern volatile int status_snapshot; extern int confirm; extern int confirm_flag; extern char *device; extern int pmtudisc; extern volatile int in_pr_addr; /* pr_addr() is executing */ extern jmp_buf pr_addr_jmp; #ifndef MSG_CONFIRM #define MSG_CONFIRM 0 #endif /* timing */ extern int timing; /* flag to do timing */ extern long tmin; /* minimum round trip time */ extern long tmax; /* maximum round trip time */ extern long long tsum; /* sum of all times, for doing average */ extern long long tsum2; extern int rtt; extern __u16 acked; extern int pipesize; /* * Write to stdout */ static inline void write_stdout(const char *str, size_t len) { size_t o = 0; ssize_t cc; do { cc = write(STDOUT_FILENO, str + o, len - o); o += cc; } while (len > o || cc < 0); } /* * tvsub -- * Subtract 2 timeval structs: out = out - in. Out is assumed to * be >= in. */ static inline void tvsub(struct timeval *out, struct timeval *in) { if ((out->tv_usec -= in->tv_usec) < 0) { --out->tv_sec; out->tv_usec += 1000000; } out->tv_sec -= in->tv_sec; } static inline void set_signal(int signo, void (*handler)(int)) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = (void (*)(int))handler; #ifdef SA_INTERRUPT sa.sa_flags = SA_INTERRUPT; #endif sigaction(signo, &sa, NULL); } extern int __schedule_exit(int next); static inline int schedule_exit(int next) { if (npackets && ntransmitted >= npackets && !deadline) next = __schedule_exit(next); return next; } static inline int in_flight(void) { __u16 diff = (__u16)ntransmitted - acked; return (diff<=0x7FFF) ? diff : ntransmitted-nreceived-nerrors; } static inline void acknowledge(__u16 seq) { __u16 diff = (__u16)ntransmitted - seq; if (diff <= 0x7FFF) { if ((int)diff+1 > pipesize) pipesize = (int)diff+1; if ((__s16)(seq - acked) > 0 || (__u16)ntransmitted - acked > 0x7FFF) acked = seq; } } static inline void advance_ntransmitted(void) { ntransmitted++; /* Invalidate acked, if 16 bit seq overflows. */ if ((__u16)ntransmitted - acked > 0x7FFF) acked = (__u16)ntransmitted + 1; } extern void limit_capabilities(void); static int enable_capability_raw(void); static int disable_capability_raw(void); static int enable_capability_admin(void); static int disable_capability_admin(void); #ifdef CAPABILITIES extern int modify_capability(cap_value_t, cap_flag_value_t); static inline int enable_capability_raw(void) { return modify_capability(CAP_NET_RAW, CAP_SET); }; static inline int disable_capability_raw(void) { return modify_capability(CAP_NET_RAW, CAP_CLEAR); }; static inline int enable_capability_admin(void) { return modify_capability(CAP_NET_ADMIN, CAP_SET); }; static inline int disable_capability_admin(void) { return modify_capability(CAP_NET_ADMIN, CAP_CLEAR); }; #else extern int modify_capability(int); static inline int enable_capability_raw(void) { return modify_capability(1); }; static inline int disable_capability_raw(void) { return modify_capability(0); }; static inline int enable_capability_admin(void) { return modify_capability(1); }; static inline int disable_capability_admin(void) { return modify_capability(0); }; #endif extern void drop_capabilities(void); typedef struct socket_st { int fd; int socktype; /* And this is workaround for bug in IP_RECVERR on raw sockets which is present * in linux-2.2.[0-19], linux-2.4.[0-7] */ int working_recverr; } socket_st; char *pr_addr(void *sa, socklen_t salen); int is_ours(socket_st *sock, uint16_t id); int ping4_run(int argc, char **argv, struct addrinfo *ai, socket_st *sock); int ping4_send_probe(socket_st *, void *packet, unsigned packet_size); int ping4_receive_error_msg(socket_st *); int ping4_parse_reply(socket_st *, struct msghdr *msg, int len, void *addr, struct timeval *); void ping4_install_filter(socket_st *); typedef struct ping_func_set_st { int (*send_probe)(socket_st *, void *packet, unsigned packet_size); int (*receive_error_msg)(socket_st *sock); int (*parse_reply)(socket_st *, struct msghdr *msg, int len, void *addr, struct timeval *); void (*install_filter)(socket_st *); } ping_func_set_st; #define MAXPACKET 128000 /* max packet size */ extern ping_func_set_st ping4_func_set; extern int pinger(ping_func_set_st *fset, socket_st *sock); extern void sock_setbufs(socket_st*, int alloc); extern void setup(socket_st *); extern int contains_pattern_in_payload(__u8 *ptr); extern void main_loop(ping_func_set_st *fset, socket_st*, __u8 *buf, int buflen) __attribute__((noreturn)); extern void finish(void) __attribute__((noreturn)); extern void status(void); extern void common_options(int ch); extern int gather_statistics(__u8 *ptr, int icmplen, int cc, __u16 seq, int hops, int csfailed, struct timeval *tv, char *from, void (*pr_reply)(__u8 *ptr, int cc)); extern void print_timestamp(void); void fill(char *patp, void *packet, unsigned packet_size); extern int mark; extern unsigned char outpack[MAXPACKET]; /* IPv6 */ int ping6_run(int argc, char **argv, struct addrinfo *ai, socket_st *sock); void ping6_usage(unsigned from_ping); int ping6_send_probe(socket_st *sockets, void *packet, unsigned packet_size); int ping6_receive_error_msg(socket_st *sockets); int ping6_parse_reply(socket_st *, struct msghdr *msg, int len, void *addr, struct timeval *); void ping6_install_filter(socket_st *sockets); extern ping_func_set_st ping6_func_set; int niquery_option_handler(const char *opt_arg); int hextoui(const char *str); extern __u32 tclass; extern __u32 flowlabel; extern struct sockaddr_in6 source6; extern struct sockaddr_in6 whereto6; extern struct sockaddr_in6 firsthop6; /* IPv6 node information query */ #define NI_NONCE_SIZE 8 struct ni_hdr { struct icmp6_hdr ni_u; __u8 ni_nonce[NI_NONCE_SIZE]; }; #define ni_type ni_u.icmp6_type #define ni_code ni_u.icmp6_code #define ni_cksum ni_u.icmp6_cksum #define ni_qtype ni_u.icmp6_data16[0] #define ni_flags ni_u.icmp6_data16[1] /* Types */ #ifndef ICMPV6_NI_QUERY # define ICMPV6_NI_QUERY 139 # define ICMPV6_NI_REPLY 140 #endif /* Query Codes */ #define NI_SUBJ_IPV6 0 #define NI_SUBJ_NAME 1 #define NI_SUBJ_IPV4 2 /* Reply Codes */ #define NI_SUCCESS 0 #define NI_REFUSED 1 #define NI_UNKNOWN 2 /* Qtypes */ #define NI_QTYPE_NOOP 0 #define NI_QTYPE_NAME 2 #define NI_QTYPE_IPV6ADDR 3 #define NI_QTYPE_IPV4ADDR 4 /* Flags */ #define NI_IPV6ADDR_F_TRUNCATE __constant_cpu_to_be16(0x0001) #define NI_IPV6ADDR_F_ALL __constant_cpu_to_be16(0x0002) #define NI_IPV6ADDR_F_COMPAT __constant_cpu_to_be16(0x0004) #define NI_IPV6ADDR_F_LINKLOCAL __constant_cpu_to_be16(0x0008) #define NI_IPV6ADDR_F_SITELOCAL __constant_cpu_to_be16(0x0010) #define NI_IPV6ADDR_F_GLOBAL __constant_cpu_to_be16(0x0020) #define NI_IPV4ADDR_F_TRUNCATE NI_IPV6ADDR_F_TRUNCATE #define NI_IPV4ADDR_F_ALL NI_IPV6ADDR_F_ALL