mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-22 18:56:38 +00:00
route(8): convert to netlink
This change converts all kernel rtsock interactions in route(8) to Netlink. Based on the WITHOUT_NETLINK_SUPPORT src.conf(5) variable, route(8) now fully operates either via Netlink or via rtsock/sysctl. The default (compile-time) is Netlink. The output for route delete/add/get/flush is targeted to be exactly the same (apart from some error handling cases). The output for the route monitor has been changed to improve readability and support netlink models. Other behaviour changes: * exact prefix lookup (route -n get a.b.c.d/e) is not yet supported. * route monitor does not show the change originator yet. Differential Revision: https://reviews.freebsd.org/D39007
This commit is contained in:
Alexander V. Chernikov
parent
a85dcd4ac4
commit
c597432e22
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@ -19,6 +19,12 @@ CFLAGS+= -DINET6
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.endif
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CFLAGS+= -I.
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.if ${MK_NETLINK_SUPPORT} != "no"
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SRCS+= route_netlink.c
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.else
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CFLAGS+=-DWITHOUT_NETLINK
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.endif
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HAS_TESTS=
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SUBDIR.${MK_TESTS}+= tests
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@ -90,12 +90,11 @@ static struct keytab {
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{0, 0}
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};
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int verbose, debugonly;
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static struct sockaddr_storage so[RTAX_MAX];
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static int pid, rtm_addrs;
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static int s;
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static int nflag, af, qflag, tflag;
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static int verbose, aflen;
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static int locking, lockrest, debugonly;
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static int nflag, af, aflen, qflag, tflag;
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static int locking, lockrest;
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static struct rt_metrics rt_metrics;
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static u_long rtm_inits;
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static uid_t uid;
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@ -103,18 +102,30 @@ static int defaultfib;
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static int numfibs;
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static char domain[MAXHOSTNAMELEN + 1];
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static bool domain_initialized;
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static int rtm_seq;
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static char rt_line[NI_MAXHOST];
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static char net_line[MAXHOSTNAMELEN + 1];
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#ifdef WITHOUT_NETLINK
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static int s;
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static int rtm_seq;
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static struct {
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struct rt_msghdr m_rtm;
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char m_space[512];
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} m_rtmsg;
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static int rtmsg_rtsock(int, int, int);
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static int flushroutes_fib_rtsock(int);
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static void monitor_rtsock(void);
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#else
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int rtmsg_nl(int, int, int, struct sockaddr_storage *, struct rt_metrics *);
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int flushroutes_fib_nl(int, int);
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void monitor_nl(int);
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#endif
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static TAILQ_HEAD(fibl_head_t, fibl) fibl_head;
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static void printb(int, const char *);
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void printb(int, const char *);
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static void flushroutes(int argc, char *argv[]);
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static int flushroutes_fib(int);
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static int getaddr(int, char *, int);
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@ -127,7 +138,7 @@ static int inet6_makenetandmask(struct sockaddr_in6 *, const char *);
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#endif
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static void interfaces(void);
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static void monitor(int, char*[]);
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static const char *netname(struct sockaddr *);
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const char *netname(struct sockaddr *);
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static void newroute(int, char **);
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static int newroute_fib(int, char *, int);
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static void pmsg_addrs(char *, int, size_t);
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@ -135,7 +146,7 @@ static void pmsg_common(struct rt_msghdr *, size_t);
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static int prefixlen(const char *);
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static void print_getmsg(struct rt_msghdr *, int, int);
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static void print_rtmsg(struct rt_msghdr *, size_t);
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static const char *routename(struct sockaddr *);
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const char *routename(struct sockaddr *);
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static int rtmsg(int, int, int);
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static void set_metric(char *, int);
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static int set_sofib(int);
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@ -216,12 +227,14 @@ main(int argc, char **argv)
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pid = getpid();
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uid = geteuid();
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#ifdef WITHOUT_NETLINK
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if (tflag)
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s = open(_PATH_DEVNULL, O_WRONLY, 0);
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else
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s = socket(PF_ROUTE, SOCK_RAW, 0);
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if (s < 0)
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err(EX_OSERR, "socket");
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#endif
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len = sizeof(numfibs);
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if (sysctlbyname("net.fibs", (void *)&numfibs, &len, NULL, 0) == -1)
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@ -264,10 +277,14 @@ static int
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set_sofib(int fib)
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{
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#ifdef WITHOUT_NETLINK
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if (fib < 0)
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return (0);
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return (setsockopt(s, SOL_SOCKET, SO_SETFIB, (void *)&fib,
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sizeof(fib)));
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#else
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return (0);
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#endif
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}
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static int
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@ -395,7 +412,9 @@ flushroutes(int argc, char *argv[])
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if (uid != 0 && !debugonly && !tflag)
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errx(EX_NOPERM, "must be root to alter routing table");
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#ifdef WITHOUT_NETLINK
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shutdown(s, SHUT_RD); /* Don't want to read back our messages */
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#endif
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TAILQ_INIT(&fibl_head);
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while (argc > 1) {
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@ -441,6 +460,17 @@ flushroutes(int argc, char *argv[])
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static int
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flushroutes_fib(int fib)
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{
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#ifdef WITHOUT_NETLINK
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return (flushroutes_fib_rtsock(fib));
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#else
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return (flushroutes_fib_nl(fib, af));
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#endif
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}
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#ifdef WITHOUT_NETLINK
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static int
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flushroutes_fib_rtsock(int fib)
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{
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struct rt_msghdr *rtm;
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size_t needed;
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@ -525,8 +555,9 @@ flushroutes_fib(int fib)
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free(buf);
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return (error);
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}
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#endif
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static const char *
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const char *
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routename(struct sockaddr *sa)
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{
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struct sockaddr_dl *sdl;
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@ -645,7 +676,7 @@ routename(struct sockaddr *sa)
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* Return the name of the network whose address is given.
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* The address is assumed to be that of a net, not a host.
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*/
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static const char *
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const char *
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netname(struct sockaddr *sa)
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{
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struct sockaddr_dl *sdl;
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@ -810,8 +841,10 @@ newroute(int argc, char **argv)
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warn("sigaction SIGALRM");
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cmd = argv[0];
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#ifdef WITHOUT_NETLINK
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if (*cmd != 'g' && *cmd != 's')
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shutdown(s, SHUT_RD); /* Don't want to read back our messages */
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#endif
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while (--argc > 0) {
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if (**(++argv)== '-') {
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switch (key = keyword(1 + *argv)) {
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@ -1398,8 +1431,8 @@ interfaces(void)
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static void
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monitor(int argc, char *argv[])
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{
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int n, fib, error;
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char msg[2048], *endptr;
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int fib, error;
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char *endptr;
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fib = defaultfib;
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while (argc > 1) {
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@ -1435,6 +1468,19 @@ monitor(int argc, char *argv[])
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interfaces();
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exit(0);
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}
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#ifdef WITHOUT_NETLINK
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monitor_rtsock();
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#else
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monitor_nl(fib);
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#endif
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}
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#ifdef WITHOUT_NETLINK
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static void
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monitor_rtsock(void)
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{
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char msg[2048];
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int n;
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#ifdef SO_RERROR
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n = 1;
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@ -1454,25 +1500,12 @@ monitor(int argc, char *argv[])
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print_rtmsg((struct rt_msghdr *)(void *)msg, n);
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}
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}
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#endif
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static int
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rtmsg(int cmd, int flags, int fib)
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{
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int rlen;
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char *cp = m_rtmsg.m_space;
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int l;
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#define NEXTADDR(w, u) \
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if (rtm_addrs & (w)) { \
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l = SA_SIZE(&(u)); \
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memmove(cp, (char *)&(u), l); \
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cp += l; \
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if (verbose) \
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sodump((struct sockaddr *)&(u), #w); \
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}
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errno = 0;
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memset(&m_rtmsg, 0, sizeof(m_rtmsg));
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if (cmd == 'a')
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cmd = RTM_ADD;
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else if (cmd == 'c')
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@ -1488,6 +1521,33 @@ rtmsg(int cmd, int flags, int fib)
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cmd = RTM_DELETE;
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flags |= RTF_PINNED;
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}
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#ifdef WITHOUT_NETLINK
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return (rtmsg_rtsock(cmd, flags, fib));
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#else
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errno = rtmsg_nl(cmd, flags, fib, so, &rt_metrics);
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return (errno == 0 ? 0 : -1);
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#endif
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}
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#ifdef WITHOUT_NETLINK
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static int
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rtmsg_rtsock(int cmd, int flags, int fib)
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{
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int rlen;
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char *cp = m_rtmsg.m_space;
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int l;
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memset(&m_rtmsg, 0, sizeof(m_rtmsg));
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#define NEXTADDR(w, u) \
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if (rtm_addrs & (w)) { \
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l = SA_SIZE(&(u)); \
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memmove(cp, (char *)&(u), l); \
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cp += l; \
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if (verbose) \
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sodump((struct sockaddr *)&(u), #w); \
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}
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#define rtm m_rtmsg.m_rtm
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rtm.rtm_type = cmd;
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rtm.rtm_flags = flags;
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@ -1545,6 +1605,7 @@ rtmsg(int cmd, int flags, int fib)
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#undef rtm
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return (0);
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}
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#endif
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static const char *const msgtypes[] = {
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"",
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@ -1571,7 +1632,7 @@ static const char *const msgtypes[] = {
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static const char metricnames[] =
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"\011weight\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire"
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"\1mtu";
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static const char routeflags[] =
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const char routeflags[] =
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"\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE"
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"\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE"
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"\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3"
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@ -1812,7 +1873,7 @@ pmsg_addrs(char *cp, int addrs, size_t len)
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(void)fflush(stdout);
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}
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static void
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void
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printb(int b, const char *str)
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{
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int i;
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835
sbin/route/route_netlink.c
Normal file
835
sbin/route/route_netlink.c
Normal file
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@ -0,0 +1,835 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <err.h>
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#include <errno.h>
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#include <sys/bitcount.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <netlink/netlink.h>
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#include <netlink/netlink_route.h>
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#include <netlink/netlink_snl.h>
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#include <netlink/netlink_snl_route.h>
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#include <netlink/netlink_snl_route_compat.h>
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#include <netlink/netlink_snl_route_parsers.h>
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const char *routename(struct sockaddr *);
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const char *netname(struct sockaddr *);
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void printb(int, const char *);
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extern const char routeflags[];
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extern int verbose, debugonly;
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int rtmsg_nl(int cmd, int rtm_flags, int fib, struct sockaddr_storage *so,
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struct rt_metrics *rt_metrics);
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int flushroutes_fib_nl(int fib, int af);
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void monitor_nl(int fib);
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struct nl_helper;
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static void print_getmsg(struct nl_helper *h, struct nlmsghdr *hdr, struct sockaddr *dst);
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static void print_nlmsg(struct nl_helper *h, struct nlmsghdr *hdr);
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#define s6_addr32 __u6_addr.__u6_addr32
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#define bitcount32(x) __bitcount32((uint32_t)(x))
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static int
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inet6_get_plen(const struct in6_addr *addr)
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{
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return (bitcount32(addr->s6_addr32[0]) + bitcount32(addr->s6_addr32[1]) +
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bitcount32(addr->s6_addr32[2]) + bitcount32(addr->s6_addr32[3]));
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}
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static void
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ip6_writemask(struct in6_addr *addr6, uint8_t mask)
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{
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uint32_t *cp;
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for (cp = (uint32_t *)addr6; mask >= 32; mask -= 32)
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*cp++ = 0xFFFFFFFF;
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if (mask > 0)
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*cp = htonl(mask ? ~((1 << (32 - mask)) - 1) : 0);
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}
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static struct sockaddr *
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get_netmask(struct snl_state *ss, int family, int plen)
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{
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if (family == AF_INET) {
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if (plen == 32)
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return (NULL);
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struct sockaddr_in *sin = snl_allocz(ss, sizeof(*sin));
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sin->sin_len = sizeof(*sin);
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sin->sin_family = family;
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sin->sin_addr.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0);
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return (struct sockaddr *)sin;
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} else if (family == AF_INET6) {
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if (plen == 128)
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return (NULL);
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struct sockaddr_in6 *sin6 = snl_allocz(ss, sizeof(*sin6));
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sin6->sin6_len = sizeof(*sin6);
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sin6->sin6_family = family;
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ip6_writemask(&sin6->sin6_addr, plen);
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return (struct sockaddr *)sin6;
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}
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return (NULL);
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}
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struct nl_helper {
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struct snl_state ss_cmd;
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};
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static void
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nl_helper_init(struct nl_helper *h)
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{
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if (!snl_init(&h->ss_cmd, NETLINK_ROUTE))
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err(1, "unable to open netlink socket");
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}
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static void
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nl_helper_free(struct nl_helper *h)
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{
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snl_free(&h->ss_cmd);
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}
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static int
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rtmsg_nl_int(struct nl_helper *h, int cmd, int rtm_flags, int fib,
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struct sockaddr_storage *so, struct rt_metrics *rt_metrics)
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{
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struct snl_state *ss = &h->ss_cmd;
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struct snl_writer nw;
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int nl_type = 0, nl_flags = 0;
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snl_init_writer(ss, &nw);
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switch (cmd) {
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case RTSOCK_RTM_ADD:
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nl_type = RTM_NEWROUTE;
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nl_flags = NLM_F_CREATE | NLM_F_APPEND; /* Do append by default */
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break;
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case RTSOCK_RTM_CHANGE:
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nl_type = RTM_NEWROUTE;
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nl_flags = NLM_F_REPLACE;
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break;
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case RTSOCK_RTM_DELETE:
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nl_type = RTM_DELROUTE;
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break;
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case RTSOCK_RTM_GET:
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nl_type = RTM_GETROUTE;
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break;
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default:
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exit(1);
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}
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struct sockaddr *dst = (struct sockaddr *)&so[RTAX_DST];
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struct sockaddr *mask = (struct sockaddr *)&so[RTAX_NETMASK];
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struct sockaddr *gw = (struct sockaddr *)&so[RTAX_GATEWAY];
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if (dst == NULL)
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return (EINVAL);
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struct nlmsghdr *hdr = snl_create_msg_request(&nw, nl_type);
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hdr->nlmsg_flags |= nl_flags;
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int plen = 0;
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int rtm_type = RTN_UNICAST;
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switch (dst->sa_family) {
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case AF_INET:
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{
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struct sockaddr_in *mask4 = (struct sockaddr_in *)mask;
|
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plen = mask4 ? bitcount32(mask4->sin_addr.s_addr) : 32;
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break;
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}
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case AF_INET6:
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{
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struct sockaddr_in6 *mask6 = (struct sockaddr_in6 *)mask;
|
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plen = mask6 ? inet6_get_plen(&mask6->sin6_addr) : 128;
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break;
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}
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default:
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return (ENOTSUP);
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}
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if (rtm_flags & RTF_REJECT)
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rtm_type = RTN_PROHIBIT;
|
||||
else if (rtm_flags & RTF_BLACKHOLE)
|
||||
rtm_type = RTN_BLACKHOLE;
|
||||
|
||||
struct rtmsg *rtm = snl_reserve_msg_object(&nw, struct rtmsg);
|
||||
rtm->rtm_family = dst->sa_family;
|
||||
rtm->rtm_protocol = RTPROT_STATIC;
|
||||
rtm->rtm_type = rtm_type;
|
||||
rtm->rtm_dst_len = plen;
|
||||
|
||||
snl_add_msg_attr_ip(&nw, RTA_DST, dst);
|
||||
snl_add_msg_attr_u32(&nw, RTA_TABLE, fib);
|
||||
|
||||
if (rtm_flags & RTF_GATEWAY) {
|
||||
if (gw->sa_family == dst->sa_family)
|
||||
snl_add_msg_attr_ip(&nw, RTA_GATEWAY, gw);
|
||||
else
|
||||
snl_add_msg_attr_ipvia(&nw, RTA_VIA, gw);
|
||||
} else if (gw != NULL) {
|
||||
/* Should be AF_LINK */
|
||||
struct sockaddr_dl *sdl = (struct sockaddr_dl *)gw;
|
||||
if (sdl->sdl_index != 0)
|
||||
snl_add_msg_attr_u32(&nw, RTA_OIF, sdl->sdl_index);
|
||||
}
|
||||
|
||||
if (rtm_flags != 0)
|
||||
snl_add_msg_attr_u32(&nw, NL_RTA_RTFLAGS, rtm_flags);
|
||||
|
||||
if (rt_metrics->rmx_mtu > 0) {
|
||||
int off = snl_add_msg_attr_nested(&nw, RTA_METRICS);
|
||||
snl_add_msg_attr_u32(&nw, RTAX_MTU, rt_metrics->rmx_mtu);
|
||||
snl_end_attr_nested(&nw, off);
|
||||
}
|
||||
|
||||
if (rt_metrics->rmx_weight > 0)
|
||||
snl_add_msg_attr_u32(&nw, NL_RTA_WEIGHT, rt_metrics->rmx_weight);
|
||||
|
||||
if (snl_finalize_msg(&nw) && snl_send_message(ss, hdr)) {
|
||||
struct snl_errmsg_data e = {};
|
||||
|
||||
hdr = snl_read_reply(ss, hdr->nlmsg_seq);
|
||||
if (nl_type == NL_RTM_GETROUTE) {
|
||||
if (hdr->nlmsg_type == NL_RTM_NEWROUTE)
|
||||
print_getmsg(h, hdr, dst);
|
||||
else {
|
||||
snl_parse_errmsg(ss, hdr, &e);
|
||||
if (e.error == ESRCH)
|
||||
warn("route has not been found");
|
||||
else
|
||||
warn("message indicates error %d", e.error);
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (snl_parse_errmsg(ss, hdr, &e))
|
||||
return (e.error);
|
||||
}
|
||||
return (EINVAL);
|
||||
}
|
||||
|
||||
int
|
||||
rtmsg_nl(int cmd, int rtm_flags, int fib, struct sockaddr_storage *so,
|
||||
struct rt_metrics *rt_metrics)
|
||||
{
|
||||
struct nl_helper h = {};
|
||||
|
||||
nl_helper_init(&h);
|
||||
int error = rtmsg_nl_int(&h, cmd, rtm_flags, fib, so, rt_metrics);
|
||||
nl_helper_free(&h);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
static void
|
||||
get_ifdata(struct nl_helper *h, uint32_t ifindex, struct snl_parsed_link_simple *link)
|
||||
{
|
||||
struct snl_state *ss = &h->ss_cmd;
|
||||
struct snl_writer nw;
|
||||
|
||||
snl_init_writer(ss, &nw);
|
||||
struct nlmsghdr *hdr = snl_create_msg_request(&nw, NL_RTM_GETLINK);
|
||||
struct ifinfomsg *ifmsg = snl_reserve_msg_object(&nw, struct ifinfomsg);
|
||||
if (ifmsg != NULL)
|
||||
ifmsg->ifi_index = ifindex;
|
||||
if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr))
|
||||
return;
|
||||
|
||||
hdr = snl_read_reply(ss, hdr->nlmsg_seq);
|
||||
|
||||
if (hdr != NULL && hdr->nlmsg_type == RTM_NEWLINK) {
|
||||
snl_parse_nlmsg(ss, hdr, &snl_rtm_link_parser_simple, link);
|
||||
}
|
||||
|
||||
if (link->ifla_ifname == NULL) {
|
||||
char ifname[16];
|
||||
|
||||
snprintf(ifname, sizeof(ifname), "if#%u", ifindex);
|
||||
int len = strlen(ifname);
|
||||
char *buf = snl_allocz(ss, len + 1);
|
||||
strlcpy(buf, ifname, len + 1);
|
||||
link->ifla_ifname = buf;
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
print_getmsg(struct nl_helper *h, struct nlmsghdr *hdr, struct sockaddr *dst)
|
||||
{
|
||||
struct snl_state *ss = &h->ss_cmd;
|
||||
struct timespec ts;
|
||||
struct snl_parsed_route r = { .rtax_weight = RT_DEFAULT_WEIGHT };
|
||||
|
||||
if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_route_parser, &r))
|
||||
return;
|
||||
|
||||
struct snl_parsed_link_simple link = {};
|
||||
get_ifdata(h, r.rta_oif, &link);
|
||||
|
||||
if (r.rtax_mtu == 0)
|
||||
r.rtax_mtu = link.ifla_mtu;
|
||||
r.rta_rtflags |= (RTF_UP | RTF_DONE);
|
||||
|
||||
(void)printf(" route to: %s\n", routename(dst));
|
||||
|
||||
if (r.rta_dst)
|
||||
(void)printf("destination: %s\n", routename(r.rta_dst));
|
||||
struct sockaddr *mask = get_netmask(ss, r.rtm_family, r.rtm_dst_len);
|
||||
if (mask)
|
||||
(void)printf(" mask: %s\n", routename(mask));
|
||||
if (r.rta_gw && (r.rta_rtflags & RTF_GATEWAY))
|
||||
(void)printf(" gateway: %s\n", routename(r.rta_gw));
|
||||
(void)printf(" fib: %u\n", (unsigned int)r.rta_table);
|
||||
if (link.ifla_ifname)
|
||||
(void)printf(" interface: %s\n", link.ifla_ifname);
|
||||
(void)printf(" flags: ");
|
||||
printb(r.rta_rtflags, routeflags);
|
||||
|
||||
struct rt_metrics rmx = {
|
||||
.rmx_mtu = r.rtax_mtu,
|
||||
.rmx_weight = r.rtax_weight,
|
||||
.rmx_expire = r.rta_expire,
|
||||
};
|
||||
|
||||
printf("\n%9s %9s %9s %9s %9s %10s %9s\n", "recvpipe",
|
||||
"sendpipe", "ssthresh", "rtt,msec", "mtu ", "weight", "expire");
|
||||
printf("%8lu ", rmx.rmx_recvpipe);
|
||||
printf("%8lu ", rmx.rmx_sendpipe);
|
||||
printf("%8lu ", rmx.rmx_ssthresh);
|
||||
printf("%8lu ", 0UL);
|
||||
printf("%8lu ", rmx.rmx_mtu);
|
||||
printf("%8lu ", rmx.rmx_weight);
|
||||
if (rmx.rmx_expire > 0)
|
||||
clock_gettime(CLOCK_REALTIME_FAST, &ts);
|
||||
else
|
||||
ts.tv_sec = 0;
|
||||
printf("%8ld \n", (long)(rmx.rmx_expire - ts.tv_sec));
|
||||
}
|
||||
|
||||
static void
|
||||
print_prefix(struct nl_helper *h, char *buf, int bufsize, struct sockaddr *sa, int plen)
|
||||
{
|
||||
int sz = 0;
|
||||
|
||||
if (sa == NULL) {
|
||||
snprintf(buf, bufsize, "<NULL>");
|
||||
return;
|
||||
}
|
||||
|
||||
switch (sa->sa_family) {
|
||||
case AF_INET:
|
||||
{
|
||||
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
|
||||
char abuf[INET_ADDRSTRLEN];
|
||||
|
||||
inet_ntop(AF_INET, &sin->sin_addr, abuf, sizeof(abuf));
|
||||
sz = snprintf(buf, bufsize, "%s", abuf);
|
||||
break;
|
||||
}
|
||||
case AF_INET6:
|
||||
{
|
||||
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
|
||||
char abuf[INET6_ADDRSTRLEN];
|
||||
char *ifname = NULL;
|
||||
|
||||
inet_ntop(AF_INET6, &sin6->sin6_addr, abuf, sizeof(abuf));
|
||||
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
|
||||
struct snl_parsed_link_simple link = {};
|
||||
|
||||
if (sin6->sin6_scope_id != 0) {
|
||||
get_ifdata(h, sin6->sin6_scope_id, &link);
|
||||
ifname = link.ifla_ifname;
|
||||
}
|
||||
}
|
||||
if (ifname == NULL)
|
||||
sz = snprintf(buf, bufsize, "%s", abuf);
|
||||
else
|
||||
sz = snprintf(buf, bufsize, "%s%%%s", abuf, ifname);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
snprintf(buf, bufsize, "unknown_af#%d", sa->sa_family);
|
||||
plen = -1;
|
||||
}
|
||||
|
||||
if (plen >= 0)
|
||||
snprintf(buf + sz, bufsize - sz, "/%d", plen);
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
print_line_prefix(const char *cmd, const char *name)
|
||||
{
|
||||
struct timespec tp;
|
||||
struct tm tm;
|
||||
char buf[32];
|
||||
|
||||
clock_gettime(CLOCK_REALTIME, &tp);
|
||||
localtime_r(&tp.tv_sec, &tm);
|
||||
|
||||
strftime(buf, sizeof(buf), "%T", &tm);
|
||||
int len = printf("%s.%03ld %s %s ", buf, tp.tv_nsec / 1000000, cmd, name);
|
||||
|
||||
return (len);
|
||||
}
|
||||
|
||||
static const char *
|
||||
get_action_name(struct nlmsghdr *hdr, int new_cmd)
|
||||
{
|
||||
if (hdr->nlmsg_type == new_cmd) {
|
||||
//return ((hdr->nlmsg_flags & NLM_F_REPLACE) ? "replace" : "add");
|
||||
return ("add/repl");
|
||||
} else
|
||||
return ("delete");
|
||||
}
|
||||
|
||||
static void
|
||||
print_nlmsg_route_nhop(struct nl_helper *h, struct snl_parsed_route *r,
|
||||
struct rta_mpath_nh *nh, bool first)
|
||||
{
|
||||
// gw 10.0.0.1 ifp vtnet0 mtu 1500 table inet.0
|
||||
if (nh->gw != NULL) {
|
||||
char gwbuf[128];
|
||||
print_prefix(h, gwbuf, sizeof(gwbuf), nh->gw, -1);
|
||||
printf("gw %s ", gwbuf);
|
||||
}
|
||||
|
||||
if (nh->ifindex != 0) {
|
||||
struct snl_parsed_link_simple link = {};
|
||||
|
||||
get_ifdata(h, nh->ifindex, &link);
|
||||
if (nh->rtax_mtu == 0)
|
||||
nh->rtax_mtu = link.ifla_mtu;
|
||||
printf("iface %s ", link.ifla_ifname);
|
||||
if (nh->rtax_mtu != 0)
|
||||
printf("mtu %d ", nh->rtax_mtu);
|
||||
}
|
||||
|
||||
if (first) {
|
||||
switch (r->rtm_family) {
|
||||
case AF_INET:
|
||||
printf("table inet.%d", r->rta_table);
|
||||
break;
|
||||
case AF_INET6:
|
||||
printf("table inet6.%d", r->rta_table);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
static void
|
||||
print_nlmsg_route(struct nl_helper *h, struct nlmsghdr *hdr)
|
||||
{
|
||||
struct snl_parsed_route r = { .rtax_weight = RT_DEFAULT_WEIGHT };
|
||||
struct snl_state *ss = &h->ss_cmd;
|
||||
|
||||
if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_route_parser, &r))
|
||||
return;
|
||||
|
||||
// 20:19:41.333 add route 10.0.0.0/24 gw 10.0.0.1 ifp vtnet0 mtu 1500 table inet.0
|
||||
|
||||
const char *cmd = get_action_name(hdr, RTM_NEWROUTE);
|
||||
int len = print_line_prefix(cmd, "route");
|
||||
|
||||
char buf[128];
|
||||
print_prefix(h, buf, sizeof(buf), r.rta_dst, r.rtm_dst_len);
|
||||
len += strlen(buf) + 1;
|
||||
printf("%s ", buf);
|
||||
|
||||
switch (r.rtm_type) {
|
||||
case RTN_BLACKHOLE:
|
||||
printf("blackhole\n");
|
||||
return;
|
||||
case RTN_UNREACHABLE:
|
||||
printf("unreach(reject)\n");
|
||||
return;
|
||||
case RTN_PROHIBIT:
|
||||
printf("prohibit(reject)\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (r.rta_multipath != NULL) {
|
||||
bool first = true;
|
||||
|
||||
memset(buf, ' ', sizeof(buf));
|
||||
buf[len] = '\0';
|
||||
|
||||
for (int i = 0; i < r.rta_multipath->num_nhops; i++) {
|
||||
struct rta_mpath_nh *nh = &r.rta_multipath->nhops[i];
|
||||
|
||||
if (!first)
|
||||
printf("%s", buf);
|
||||
print_nlmsg_route_nhop(h, &r, nh, first);
|
||||
first = false;
|
||||
}
|
||||
} else {
|
||||
struct rta_mpath_nh nh = {
|
||||
.gw = r.rta_gw,
|
||||
.ifindex = r.rta_oif,
|
||||
.rtax_mtu = r.rtax_mtu,
|
||||
};
|
||||
|
||||
print_nlmsg_route_nhop(h, &r, &nh, true);
|
||||
}
|
||||
}
|
||||
|
||||
static const char *operstate[] = {
|
||||
"UNKNOWN", /* 0, IF_OPER_UNKNOWN */
|
||||
"NOTPRESENT", /* 1, IF_OPER_NOTPRESENT */
|
||||
"DOWN", /* 2, IF_OPER_DOWN */
|
||||
"LLDOWN", /* 3, IF_OPER_LOWERLAYERDOWN */
|
||||
"TESTING", /* 4, IF_OPER_TESTING */
|
||||
"DORMANT", /* 5, IF_OPER_DORMANT */
|
||||
"UP", /* 6, IF_OPER_UP */
|
||||
};
|
||||
|
||||
static void
|
||||
print_nlmsg_link(struct nl_helper *h, struct nlmsghdr *hdr)
|
||||
{
|
||||
struct snl_parsed_link l = {};
|
||||
struct snl_state *ss = &h->ss_cmd;
|
||||
|
||||
if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_link_parser, &l))
|
||||
return;
|
||||
|
||||
// 20:19:41.333 add iface#3 vtnet0 admin UP oper UP mtu 1500 table inet.0
|
||||
const char *cmd = get_action_name(hdr, RTM_NEWLINK);
|
||||
print_line_prefix(cmd, "iface");
|
||||
|
||||
printf("iface#%u %s ", l.ifi_index, l.ifla_ifname);
|
||||
printf("admin %s ", (l.ifi_flags & IFF_UP) ? "UP" : "DOWN");
|
||||
if (l.ifla_operstate < NL_ARRAY_LEN(operstate))
|
||||
printf("oper %s ", operstate[l.ifla_operstate]);
|
||||
if (l.ifla_mtu > 0)
|
||||
printf("mtu %u ", l.ifla_mtu);
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
static void
|
||||
print_nlmsg_addr(struct nl_helper *h, struct nlmsghdr *hdr)
|
||||
{
|
||||
struct snl_parsed_addr attrs = {};
|
||||
struct snl_state *ss = &h->ss_cmd;
|
||||
|
||||
if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_addr_parser, &attrs))
|
||||
return;
|
||||
|
||||
// add addr 192.168.1.1/24 iface vtnet0
|
||||
const char *cmd = get_action_name(hdr, RTM_NEWADDR);
|
||||
print_line_prefix(cmd, "addr");
|
||||
|
||||
char buf[128];
|
||||
struct sockaddr *addr = attrs.ifa_local ? attrs.ifa_local : attrs.ifa_address;
|
||||
print_prefix(h, buf, sizeof(buf), addr, attrs.ifa_prefixlen);
|
||||
printf("%s ", buf);
|
||||
|
||||
struct snl_parsed_link_simple link = {};
|
||||
get_ifdata(h, attrs.ifa_index, &link);
|
||||
|
||||
if (link.ifi_flags & IFF_POINTOPOINT) {
|
||||
char buf[64];
|
||||
print_prefix(h, buf, sizeof(buf), attrs.ifa_address, -1);
|
||||
printf("-> %s ", buf);
|
||||
}
|
||||
|
||||
printf("iface %s ", link.ifla_ifname);
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
static const char *nudstate[] = {
|
||||
"INCOMPLETE", /* 0x01(0) */
|
||||
"REACHABLE", /* 0x02(1) */
|
||||
"STALE", /* 0x04(2) */
|
||||
"DELAY", /* 0x08(3) */
|
||||
"PROBE", /* 0x10(4) */
|
||||
"FAILED", /* 0x20(5) */
|
||||
};
|
||||
|
||||
#define NUD_INCOMPLETE 0x01 /* No lladdr, address resolution in progress */
|
||||
#define NUD_REACHABLE 0x02 /* reachable & recently resolved */
|
||||
#define NUD_STALE 0x04 /* has lladdr but it's stale */
|
||||
#define NUD_DELAY 0x08 /* has lladdr, is stale, probes delayed */
|
||||
#define NUD_PROBE 0x10 /* has lladdr, is stale, probes sent */
|
||||
#define NUD_FAILED 0x20 /* unused */
|
||||
|
||||
|
||||
static void
|
||||
print_nlmsg_neigh(struct nl_helper *h, struct nlmsghdr *hdr)
|
||||
{
|
||||
struct snl_parsed_neigh attrs = {};
|
||||
struct snl_state *ss = &h->ss_cmd;
|
||||
|
||||
if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_neigh_parser, &attrs))
|
||||
return;
|
||||
|
||||
// add addr 192.168.1.1 state %s lladdr %s iface vtnet0
|
||||
const char *cmd = get_action_name(hdr, RTM_NEWNEIGH);
|
||||
print_line_prefix(cmd, "neigh");
|
||||
|
||||
char buf[128];
|
||||
print_prefix(h, buf, sizeof(buf), attrs.nda_dst, -1);
|
||||
printf("%s ", buf);
|
||||
|
||||
struct snl_parsed_link_simple link = {};
|
||||
get_ifdata(h, attrs.nda_ifindex, &link);
|
||||
|
||||
for (unsigned int i = 0; i < NL_ARRAY_LEN(nudstate); i++) {
|
||||
if ((1 << i) & attrs.ndm_state) {
|
||||
printf("state %s ", nudstate[i]);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (attrs.nda_lladdr != NULL) {
|
||||
int if_type = link.ifi_type;
|
||||
|
||||
if ((if_type == IFT_ETHER || if_type == IFT_L2VLAN || if_type == IFT_BRIDGE) &&
|
||||
NLA_DATA_LEN(attrs.nda_lladdr) == ETHER_ADDR_LEN) {
|
||||
struct ether_addr *ll;
|
||||
|
||||
ll = (struct ether_addr *)NLA_DATA(attrs.nda_lladdr);
|
||||
printf("lladdr %s ", ether_ntoa(ll));
|
||||
} else {
|
||||
struct sockaddr_dl sdl = {
|
||||
.sdl_len = sizeof(sdl),
|
||||
.sdl_family = AF_LINK,
|
||||
.sdl_index = attrs.nda_ifindex,
|
||||
.sdl_type = if_type,
|
||||
.sdl_alen = NLA_DATA_LEN(attrs.nda_lladdr),
|
||||
};
|
||||
if (sdl.sdl_alen < sizeof(sdl.sdl_data)) {
|
||||
void *ll = NLA_DATA(attrs.nda_lladdr);
|
||||
|
||||
memcpy(sdl.sdl_data, ll, sdl.sdl_alen);
|
||||
printf("lladdr %s ", link_ntoa(&sdl));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (link.ifla_ifname != NULL)
|
||||
printf("iface %s ", link.ifla_ifname);
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
static void
|
||||
print_nlmsg_generic(struct nl_helper *h, struct nlmsghdr *hdr)
|
||||
{
|
||||
}
|
||||
|
||||
static void
|
||||
print_nlmsg(struct nl_helper *h, struct nlmsghdr *hdr)
|
||||
{
|
||||
switch (hdr->nlmsg_type) {
|
||||
case RTM_NEWLINK:
|
||||
case RTM_DELLINK:
|
||||
print_nlmsg_link(h, hdr);
|
||||
break;
|
||||
case RTM_NEWADDR:
|
||||
case RTM_DELADDR:
|
||||
print_nlmsg_addr(h, hdr);
|
||||
break;
|
||||
case RTM_NEWROUTE:
|
||||
case RTM_DELROUTE:
|
||||
print_nlmsg_route(h, hdr);
|
||||
break;
|
||||
case RTM_NEWNEIGH:
|
||||
case RTM_DELNEIGH:
|
||||
print_nlmsg_neigh(h, hdr);
|
||||
break;
|
||||
default:
|
||||
print_nlmsg_generic(h, hdr);
|
||||
}
|
||||
|
||||
snl_clear_lb(&h->ss_cmd);
|
||||
}
|
||||
|
||||
void
|
||||
monitor_nl(int fib)
|
||||
{
|
||||
struct snl_state ss_event = {};
|
||||
struct nl_helper h;
|
||||
|
||||
if (!snl_init(&ss_event, NETLINK_ROUTE))
|
||||
err(1, "unable to open netlink socket");
|
||||
nl_helper_init(&h);
|
||||
|
||||
int groups[] = {
|
||||
RTNLGRP_LINK,
|
||||
RTNLGRP_NEIGH,
|
||||
RTNLGRP_NEXTHOP,
|
||||
#ifdef INET
|
||||
RTNLGRP_IPV4_IFADDR,
|
||||
RTNLGRP_IPV4_ROUTE,
|
||||
#endif
|
||||
#ifdef INET6
|
||||
RTNLGRP_IPV6_IFADDR,
|
||||
RTNLGRP_IPV6_ROUTE,
|
||||
#endif
|
||||
};
|
||||
|
||||
for (unsigned int i = 0; i < NL_ARRAY_LEN(groups); i++) {
|
||||
int error;
|
||||
int optval = groups[i];
|
||||
socklen_t optlen = sizeof(optval);
|
||||
error = setsockopt(ss_event.fd, SOL_NETLINK,
|
||||
NETLINK_ADD_MEMBERSHIP, &optval, optlen);
|
||||
if (error != 0)
|
||||
warn("Unable to subscribe to group %d", optval);
|
||||
}
|
||||
|
||||
struct nlmsghdr *hdr;
|
||||
while ((hdr = snl_read_message(&ss_event)) != NULL)
|
||||
{
|
||||
// printf("-- MSG type %d--\n", hdr->nlmsg_type);
|
||||
print_nlmsg(&h, hdr);
|
||||
snl_clear_lb(&h.ss_cmd);
|
||||
snl_clear_lb(&ss_event);
|
||||
}
|
||||
|
||||
snl_free(&ss_event);
|
||||
nl_helper_free(&h);
|
||||
exit(0);
|
||||
}
|
||||
|
||||
static void
|
||||
print_flushed_route(struct snl_parsed_route *r, struct sockaddr *gw)
|
||||
{
|
||||
struct sockaddr *sa = r->rta_dst;
|
||||
|
||||
printf("%-20.20s ", r->rta_rtflags & RTF_HOST ?
|
||||
routename(sa) : netname(sa));
|
||||
sa = gw;
|
||||
printf("%-20.20s ", routename(sa));
|
||||
if (r->rta_table >= 0)
|
||||
printf("-fib %-3d ", r->rta_table);
|
||||
printf("done\n");
|
||||
}
|
||||
|
||||
static int
|
||||
flushroute_one(struct nl_helper *h, struct snl_parsed_route *r)
|
||||
{
|
||||
struct snl_state *ss = &h->ss_cmd;
|
||||
struct snl_errmsg_data e = {};
|
||||
struct snl_writer nw;
|
||||
|
||||
snl_init_writer(ss, &nw);
|
||||
|
||||
struct nlmsghdr *hdr = snl_create_msg_request(&nw, NL_RTM_DELROUTE);
|
||||
struct rtmsg *rtm = snl_reserve_msg_object(&nw, struct rtmsg);
|
||||
rtm->rtm_family = r->rtm_family;
|
||||
rtm->rtm_dst_len = r->rtm_dst_len;
|
||||
|
||||
snl_add_msg_attr_u32(&nw, RTA_TABLE, r->rta_table);
|
||||
snl_add_msg_attr_ip(&nw, RTA_DST, r->rta_dst);
|
||||
|
||||
if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr))
|
||||
return (ENOMEM);
|
||||
|
||||
if (!snl_read_reply_code(ss, hdr->nlmsg_seq, &e)) {
|
||||
return (e.error);
|
||||
if (e.error == EPERM)
|
||||
errc(1, e.error, "RTM_DELROUTE failed:");
|
||||
else
|
||||
warnc(e.error, "RTM_DELROUTE failed:");
|
||||
return (true);
|
||||
};
|
||||
|
||||
if (verbose)
|
||||
print_nlmsg(h, hdr);
|
||||
else {
|
||||
if (r->rta_multipath != NULL) {
|
||||
for (int i = 0; i < r->rta_multipath->num_nhops; i++) {
|
||||
struct rta_mpath_nh *nh = &r->rta_multipath->nhops[i];
|
||||
|
||||
print_flushed_route(r, nh->gw);
|
||||
}
|
||||
|
||||
} else
|
||||
print_flushed_route(r, r->rta_gw);
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
flushroutes_fib_nl(int fib, int af)
|
||||
{
|
||||
struct snl_state ss = {};
|
||||
struct snl_writer nw;
|
||||
struct nl_helper h = {};
|
||||
|
||||
if (!snl_init(&ss, NETLINK_ROUTE))
|
||||
err(1, "unable to open netlink socket");
|
||||
snl_init_writer(&ss, &nw);
|
||||
|
||||
struct nlmsghdr *hdr = snl_create_msg_request(&nw, NL_RTM_GETROUTE);
|
||||
hdr->nlmsg_flags |= NLM_F_DUMP;
|
||||
struct rtmsg *rtm = snl_reserve_msg_object(&nw, struct rtmsg);
|
||||
rtm->rtm_family = af;
|
||||
snl_add_msg_attr_u32(&nw, RTA_TABLE, fib);
|
||||
|
||||
if (!snl_finalize_msg(&nw) || !snl_send_message(&ss, hdr)) {
|
||||
snl_free(&ss);
|
||||
return (EINVAL);
|
||||
}
|
||||
|
||||
struct snl_errmsg_data e = {};
|
||||
uint32_t nlm_seq = hdr->nlmsg_seq;
|
||||
|
||||
nl_helper_init(&h);
|
||||
|
||||
while ((hdr = snl_read_reply_multi(&ss, nlm_seq, &e)) != NULL) {
|
||||
struct snl_parsed_route r = { .rtax_weight = RT_DEFAULT_WEIGHT };
|
||||
int error;
|
||||
|
||||
if (!snl_parse_nlmsg(&ss, hdr, &snl_rtm_route_parser, &r))
|
||||
continue;
|
||||
if (verbose)
|
||||
print_nlmsg(&h, hdr);
|
||||
if (r.rta_table != (uint32_t)fib || r.rtm_family != af)
|
||||
continue;
|
||||
if ((r.rta_rtflags & RTF_GATEWAY) == 0)
|
||||
continue;
|
||||
if (debugonly)
|
||||
continue;
|
||||
|
||||
if ((error = flushroute_one(&h, &r)) != 0) {
|
||||
if (error == EPERM)
|
||||
errc(1, error, "RTM_DELROUTE failed:");
|
||||
else
|
||||
warnc(error, "RTM_DELROUTE failed:");
|
||||
}
|
||||
snl_clear_lb(&h.ss_cmd);
|
||||
}
|
||||
|
||||
snl_free(&ss);
|
||||
nl_helper_free(&h);
|
||||
|
||||
return (e.error);
|
||||
}
|
||||
|
||||
Loading…
Reference in a new issue