iof-bird-daemon / sysdep / unix / io.c @ 8e433d6a
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/*
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* BIRD Internet Routing Daemon -- Unix I/O
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*
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* (c) 1998--2004 Martin Mares <mj@ucw.cz>
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* (c) 2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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/* Unfortunately, some glibc versions hide parts of RFC 3542 API
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if _GNU_SOURCE is not defined. */
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#define _GNU_SOURCE 1 |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <time.h> |
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#include <sys/time.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/uio.h> |
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#include <sys/un.h> |
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#include <poll.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <net/if.h> |
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#include <netinet/in.h> |
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#include <netinet/tcp.h> |
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#include <netinet/udp.h> |
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#include <netinet/icmp6.h> |
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#include "nest/bird.h" |
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#include "lib/lists.h" |
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#include "lib/resource.h" |
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#include "lib/timer.h" |
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#include "lib/socket.h" |
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#include "lib/event.h" |
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#include "lib/string.h" |
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#include "nest/iface.h" |
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#include "lib/unix.h" |
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#include "lib/sysio.h" |
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/* Maximum number of calls of tx handler for one socket in one
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* poll iteration. Should be small enough to not monopolize CPU by
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* one protocol instance.
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*/
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#define MAX_STEPS 4 |
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/* Maximum number of calls of rx handler for all sockets in one poll
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iteration. RX callbacks are often much more costly so we limit
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this to gen small latencies */
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#define MAX_RX_STEPS 4 |
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/*
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* Tracked Files
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*/
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struct rfile {
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resource r; |
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FILE *f; |
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}; |
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static void |
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rf_free(resource *r) |
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{
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struct rfile *a = (struct rfile *) r; |
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fclose(a->f); |
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} |
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static void |
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rf_dump(resource *r) |
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{
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struct rfile *a = (struct rfile *) r; |
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debug("(FILE *%p)\n", a->f);
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} |
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static struct resclass rf_class = { |
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"FILE",
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sizeof(struct rfile), |
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rf_free, |
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rf_dump, |
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NULL,
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NULL
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}; |
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void *
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tracked_fopen(pool *p, char *name, char *mode) |
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{
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FILE *f = fopen(name, mode); |
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if (f)
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{
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struct rfile *r = ralloc(p, &rf_class);
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r->f = f; |
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} |
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return f;
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} |
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/**
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* DOC: Timers
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*
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* Timers are resources which represent a wish of a module to call
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* a function at the specified time. The platform dependent code
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* doesn't guarantee exact timing, only that a timer function
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* won't be called before the requested time.
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*
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* In BIRD, time is represented by values of the &bird_clock_t type
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* which are integral numbers interpreted as a relative number of seconds since
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* some fixed time point in past. The current time can be read
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* from variable @now with reasonable accuracy and is monotonic. There is also
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* a current 'absolute' time in variable @now_real reported by OS.
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*
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* Each timer is described by a &timer structure containing a pointer
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* to the handler function (@hook), data private to this function (@data),
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* time the function should be called at (@expires, 0 for inactive timers),
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* for the other fields see |timer.h|.
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*/
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#define NEAR_TIMER_LIMIT 4 |
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static list near_timers, far_timers;
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static bird_clock_t first_far_timer = TIME_INFINITY;
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/* now must be different from 0, because 0 is a special value in timer->expires */
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bird_clock_t now = 1, now_real, boot_time;
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static void |
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update_times_plain(void)
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{
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bird_clock_t new_time = time(NULL);
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int delta = new_time - now_real;
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if ((delta >= 0) && (delta < 60)) |
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now += delta; |
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else if (now_real != 0) |
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log(L_WARN "Time jump, delta %d s", delta);
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now_real = new_time; |
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} |
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static void |
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update_times_gettime(void)
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{
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struct timespec ts;
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int rv;
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rv = clock_gettime(CLOCK_MONOTONIC, &ts); |
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if (rv != 0) |
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die("clock_gettime: %m");
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if (ts.tv_sec != now) {
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if (ts.tv_sec < now)
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log(L_ERR "Monotonic timer is broken");
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now = ts.tv_sec; |
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now_real = time(NULL);
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} |
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} |
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static int clock_monotonic_available; |
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static inline void |
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update_times(void)
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{
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if (clock_monotonic_available)
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update_times_gettime(); |
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else
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update_times_plain(); |
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} |
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static inline void |
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init_times(void)
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{
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struct timespec ts;
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clock_monotonic_available = (clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
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if (!clock_monotonic_available)
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log(L_WARN "Monotonic timer is missing");
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} |
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static void |
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tm_free(resource *r) |
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{
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timer *t = (timer *) r; |
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tm_stop(t); |
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} |
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static void |
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tm_dump(resource *r) |
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{
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timer *t = (timer *) r; |
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debug("(code %p, data %p, ", t->hook, t->data);
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if (t->randomize)
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debug("rand %d, ", t->randomize);
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if (t->recurrent)
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debug("recur %d, ", t->recurrent);
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if (t->expires)
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debug("expires in %d sec)\n", t->expires - now);
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else
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debug("inactive)\n");
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} |
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static struct resclass tm_class = { |
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"Timer",
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sizeof(timer),
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tm_free, |
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tm_dump, |
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NULL,
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NULL
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}; |
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/**
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* tm_new - create a timer
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* @p: pool
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*
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* This function creates a new timer resource and returns
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* a pointer to it. To use the timer, you need to fill in
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* the structure fields and call tm_start() to start timing.
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*/
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timer * |
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tm_new(pool *p) |
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{
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timer *t = ralloc(p, &tm_class); |
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return t;
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} |
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static inline void |
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tm_insert_near(timer *t) |
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{
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node *n = HEAD(near_timers); |
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while (n->next && (SKIP_BACK(timer, n, n)->expires < t->expires))
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n = n->next; |
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insert_node(&t->n, n->prev); |
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} |
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/**
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* tm_start - start a timer
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* @t: timer
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* @after: number of seconds the timer should be run after
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*
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* This function schedules the hook function of the timer to
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* be called after @after seconds. If the timer has been already
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* started, it's @expire time is replaced by the new value.
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*
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* You can have set the @randomize field of @t, the timeout
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* will be increased by a random number of seconds chosen
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* uniformly from range 0 .. @randomize.
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*
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* You can call tm_start() from the handler function of the timer
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* to request another run of the timer. Also, you can set the @recurrent
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* field to have the timer re-added automatically with the same timeout.
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*/
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void
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tm_start(timer *t, unsigned after)
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{
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bird_clock_t when; |
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if (t->randomize)
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after += random() % (t->randomize + 1);
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when = now + after; |
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if (t->expires == when)
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return;
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if (t->expires)
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rem_node(&t->n); |
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t->expires = when; |
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if (after <= NEAR_TIMER_LIMIT)
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tm_insert_near(t); |
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else
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{
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if (!first_far_timer || first_far_timer > when)
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first_far_timer = when; |
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add_tail(&far_timers, &t->n); |
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} |
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} |
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/**
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* tm_stop - stop a timer
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* @t: timer
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*
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* This function stops a timer. If the timer is already stopped,
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* nothing happens.
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*/
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void
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tm_stop(timer *t) |
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{
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if (t->expires)
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{
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rem_node(&t->n); |
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t->expires = 0;
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} |
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} |
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static void |
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tm_dump_them(char *name, list *l)
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{
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node *n; |
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timer *t; |
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debug("%s timers:\n", name);
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WALK_LIST(n, *l) |
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{
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t = SKIP_BACK(timer, n, n); |
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debug("%p ", t);
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tm_dump(&t->r); |
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} |
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debug("\n");
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} |
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void
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tm_dump_all(void)
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{
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tm_dump_them("Near", &near_timers);
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tm_dump_them("Far", &far_timers);
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} |
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static inline time_t |
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tm_first_shot(void)
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{
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time_t x = first_far_timer; |
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if (!EMPTY_LIST(near_timers))
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{
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timer *t = SKIP_BACK(timer, n, HEAD(near_timers)); |
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if (t->expires < x)
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x = t->expires; |
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} |
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return x;
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} |
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void io_log_event(void *hook, void *data); |
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static void |
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tm_shot(void)
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{
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timer *t; |
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node *n, *m; |
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if (first_far_timer <= now)
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{
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bird_clock_t limit = now + NEAR_TIMER_LIMIT; |
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first_far_timer = TIME_INFINITY; |
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n = HEAD(far_timers); |
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while (m = n->next)
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{
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t = SKIP_BACK(timer, n, n); |
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if (t->expires <= limit)
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{
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rem_node(n); |
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tm_insert_near(t); |
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} |
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else if (t->expires < first_far_timer) |
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first_far_timer = t->expires; |
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n = m; |
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} |
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} |
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while ((n = HEAD(near_timers)) -> next)
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{
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int delay;
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t = SKIP_BACK(timer, n, n); |
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if (t->expires > now)
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break;
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rem_node(n); |
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delay = t->expires - now; |
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t->expires = 0;
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if (t->recurrent)
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{
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int i = t->recurrent - delay;
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if (i < 0) |
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i = 0;
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tm_start(t, i); |
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} |
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io_log_event(t->hook, t->data); |
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t->hook(t); |
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} |
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} |
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/**
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* tm_parse_datetime - parse a date and time
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* @x: datetime string
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*
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* tm_parse_datetime() takes a textual representation of
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* a date and time (dd-mm-yyyy hh:mm:ss)
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* and converts it to the corresponding value of type &bird_clock_t.
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*/
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bird_clock_t |
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tm_parse_datetime(char *x)
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{
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struct tm tm;
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int n;
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time_t t; |
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if (sscanf(x, "%d-%d-%d %d:%d:%d%n", &tm.tm_mday, &tm.tm_mon, &tm.tm_year, &tm.tm_hour, &tm.tm_min, &tm.tm_sec, &n) != 6 || x[n]) |
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return tm_parse_date(x);
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tm.tm_mon--; |
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tm.tm_year -= 1900;
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t = mktime(&tm); |
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if (t == (time_t) -1) |
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return 0; |
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return t;
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} |
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/**
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* tm_parse_date - parse a date
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* @x: date string
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*
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* tm_parse_date() takes a textual representation of a date (dd-mm-yyyy)
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* and converts it to the corresponding value of type &bird_clock_t.
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*/
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bird_clock_t |
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tm_parse_date(char *x)
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{
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struct tm tm;
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int n;
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time_t t; |
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|
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if (sscanf(x, "%d-%d-%d%n", &tm.tm_mday, &tm.tm_mon, &tm.tm_year, &n) != 3 || x[n]) |
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return 0; |
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tm.tm_mon--; |
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tm.tm_year -= 1900;
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tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
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t = mktime(&tm); |
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if (t == (time_t) -1) |
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return 0; |
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return t;
|
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} |
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|
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static void |
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tm_format_reltime(char *x, struct tm *tm, bird_clock_t delta) |
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{
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static char *month_names[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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|
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if (delta < 20*3600) |
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bsprintf(x, "%02d:%02d", tm->tm_hour, tm->tm_min);
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else if (delta < 360*86400) |
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bsprintf(x, "%s%02d", month_names[tm->tm_mon], tm->tm_mday);
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else
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bsprintf(x, "%d", tm->tm_year+1900); |
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} |
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|
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#include "conf/conf.h" |
| 447 |
|
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/**
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* tm_format_datetime - convert date and time to textual representation
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* @x: destination buffer of size %TM_DATETIME_BUFFER_SIZE
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* @fmt_spec: specification of resulting textual representation of the time
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| 452 |
* @t: time
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*
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| 454 |
* This function formats the given relative time value @t to a textual
|
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* date/time representation (dd-mm-yyyy hh:mm:ss) in real time.
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*/
|
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void
|
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tm_format_datetime(char *x, struct timeformat *fmt_spec, bird_clock_t t) |
| 459 |
{
|
| 460 |
const char *fmt_used; |
| 461 |
struct tm *tm;
|
| 462 |
bird_clock_t delta = now - t; |
| 463 |
t = now_real - delta; |
| 464 |
tm = localtime(&t); |
| 465 |
|
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if (fmt_spec->fmt1 == NULL) |
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return tm_format_reltime(x, tm, delta);
|
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|
| 469 |
if ((fmt_spec->limit == 0) || (delta < fmt_spec->limit)) |
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fmt_used = fmt_spec->fmt1; |
| 471 |
else
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| 472 |
fmt_used = fmt_spec->fmt2; |
| 473 |
|
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int rv = strftime(x, TM_DATETIME_BUFFER_SIZE, fmt_used, tm);
|
| 475 |
if (((rv == 0) && fmt_used[0]) || (rv == TM_DATETIME_BUFFER_SIZE)) |
| 476 |
strcpy(x, "<too-long>");
|
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} |
| 478 |
|
| 479 |
|
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/**
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| 481 |
* DOC: Sockets
|
| 482 |
*
|
| 483 |
* Socket resources represent network connections. Their data structure (&socket)
|
| 484 |
* contains a lot of fields defining the exact type of the socket, the local and
|
| 485 |
* remote addresses and ports, pointers to socket buffers and finally pointers to
|
| 486 |
* hook functions to be called when new data have arrived to the receive buffer
|
| 487 |
* (@rx_hook), when the contents of the transmit buffer have been transmitted
|
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* (@tx_hook) and when an error or connection close occurs (@err_hook).
|
| 489 |
*
|
| 490 |
* Freeing of sockets from inside socket hooks is perfectly safe.
|
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*/
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|
| 493 |
#ifndef SOL_IP
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| 494 |
#define SOL_IP IPPROTO_IP
|
| 495 |
#endif
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| 496 |
|
| 497 |
#ifndef SOL_IPV6
|
| 498 |
#define SOL_IPV6 IPPROTO_IPV6
|
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#endif
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|
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#ifndef SOL_ICMPV6
|
| 502 |
#define SOL_ICMPV6 IPPROTO_ICMPV6
|
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#endif
|
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|
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|
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/*
|
| 507 |
* Sockaddr helper functions
|
| 508 |
*/
|
| 509 |
|
| 510 |
static inline int sockaddr_length(int af) |
| 511 |
{ return (af == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6); }
|
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|
| 513 |
static inline void |
| 514 |
sockaddr_fill4(struct sockaddr_in *sa, ip_addr a, struct iface *ifa, uint port) |
| 515 |
{
|
| 516 |
memset(sa, 0, sizeof(struct sockaddr_in)); |
| 517 |
#ifdef HAVE_SIN_LEN
|
| 518 |
sa->sin_len = sizeof(struct sockaddr_in); |
| 519 |
#endif
|
| 520 |
sa->sin_family = AF_INET; |
| 521 |
sa->sin_port = htons(port); |
| 522 |
sa->sin_addr = ipa_to_in4(a); |
| 523 |
} |
| 524 |
|
| 525 |
static inline void |
| 526 |
sockaddr_fill6(struct sockaddr_in6 *sa, ip_addr a, struct iface *ifa, uint port) |
| 527 |
{
|
| 528 |
memset(sa, 0, sizeof(struct sockaddr_in6)); |
| 529 |
#ifdef SIN6_LEN
|
| 530 |
sa->sin6_len = sizeof(struct sockaddr_in6); |
| 531 |
#endif
|
| 532 |
sa->sin6_family = AF_INET6; |
| 533 |
sa->sin6_port = htons(port); |
| 534 |
sa->sin6_flowinfo = 0;
|
| 535 |
sa->sin6_addr = ipa_to_in6(a); |
| 536 |
|
| 537 |
if (ifa && ipa_is_link_local(a))
|
| 538 |
sa->sin6_scope_id = ifa->index; |
| 539 |
} |
| 540 |
|
| 541 |
void
|
| 542 |
sockaddr_fill(sockaddr *sa, int af, ip_addr a, struct iface *ifa, uint port) |
| 543 |
{
|
| 544 |
if (af == AF_INET)
|
| 545 |
sockaddr_fill4((struct sockaddr_in *) sa, a, ifa, port);
|
| 546 |
else if (af == AF_INET6) |
| 547 |
sockaddr_fill6((struct sockaddr_in6 *) sa, a, ifa, port);
|
| 548 |
else
|
| 549 |
bug("Unknown AF");
|
| 550 |
} |
| 551 |
|
| 552 |
static inline void |
| 553 |
sockaddr_read4(struct sockaddr_in *sa, ip_addr *a, struct iface **ifa, uint *port) |
| 554 |
{
|
| 555 |
*port = ntohs(sa->sin_port); |
| 556 |
*a = ipa_from_in4(sa->sin_addr); |
| 557 |
} |
| 558 |
|
| 559 |
static inline void |
| 560 |
sockaddr_read6(struct sockaddr_in6 *sa, ip_addr *a, struct iface **ifa, uint *port) |
| 561 |
{
|
| 562 |
*port = ntohs(sa->sin6_port); |
| 563 |
*a = ipa_from_in6(sa->sin6_addr); |
| 564 |
|
| 565 |
if (ifa && ipa_is_link_local(*a))
|
| 566 |
*ifa = if_find_by_index(sa->sin6_scope_id); |
| 567 |
} |
| 568 |
|
| 569 |
int
|
| 570 |
sockaddr_read(sockaddr *sa, int af, ip_addr *a, struct iface **ifa, uint *port) |
| 571 |
{
|
| 572 |
if (sa->sa.sa_family != af)
|
| 573 |
goto fail;
|
| 574 |
|
| 575 |
if (af == AF_INET)
|
| 576 |
sockaddr_read4((struct sockaddr_in *) sa, a, ifa, port);
|
| 577 |
else if (af == AF_INET6) |
| 578 |
sockaddr_read6((struct sockaddr_in6 *) sa, a, ifa, port);
|
| 579 |
else
|
| 580 |
goto fail;
|
| 581 |
|
| 582 |
return 0; |
| 583 |
|
| 584 |
fail:
|
| 585 |
*a = IPA_NONE; |
| 586 |
*port = 0;
|
| 587 |
return -1; |
| 588 |
} |
| 589 |
|
| 590 |
|
| 591 |
/*
|
| 592 |
* IPv6 multicast syscalls
|
| 593 |
*/
|
| 594 |
|
| 595 |
/* Fortunately standardized in RFC 3493 */
|
| 596 |
|
| 597 |
#define INIT_MREQ6(maddr,ifa) \
|
| 598 |
{ .ipv6mr_multiaddr = ipa_to_in6(maddr), .ipv6mr_interface = ifa->index }
|
| 599 |
|
| 600 |
static inline int |
| 601 |
sk_setup_multicast6(sock *s) |
| 602 |
{
|
| 603 |
int index = s->iface->index;
|
| 604 |
int ttl = s->ttl;
|
| 605 |
int n = 0; |
| 606 |
|
| 607 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_MULTICAST_IF, &index, sizeof(index)) < 0) |
| 608 |
ERR("IPV6_MULTICAST_IF");
|
| 609 |
|
| 610 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0) |
| 611 |
ERR("IPV6_MULTICAST_HOPS");
|
| 612 |
|
| 613 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_MULTICAST_LOOP, &n, sizeof(n)) < 0) |
| 614 |
ERR("IPV6_MULTICAST_LOOP");
|
| 615 |
|
| 616 |
return 0; |
| 617 |
} |
| 618 |
|
| 619 |
static inline int |
| 620 |
sk_join_group6(sock *s, ip_addr maddr) |
| 621 |
{
|
| 622 |
struct ipv6_mreq mr = INIT_MREQ6(maddr, s->iface);
|
| 623 |
|
| 624 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_JOIN_GROUP, &mr, sizeof(mr)) < 0) |
| 625 |
ERR("IPV6_JOIN_GROUP");
|
| 626 |
|
| 627 |
return 0; |
| 628 |
} |
| 629 |
|
| 630 |
static inline int |
| 631 |
sk_leave_group6(sock *s, ip_addr maddr) |
| 632 |
{
|
| 633 |
struct ipv6_mreq mr = INIT_MREQ6(maddr, s->iface);
|
| 634 |
|
| 635 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_LEAVE_GROUP, &mr, sizeof(mr)) < 0) |
| 636 |
ERR("IPV6_LEAVE_GROUP");
|
| 637 |
|
| 638 |
return 0; |
| 639 |
} |
| 640 |
|
| 641 |
|
| 642 |
/*
|
| 643 |
* IPv6 packet control messages
|
| 644 |
*/
|
| 645 |
|
| 646 |
/* Also standardized, in RFC 3542 */
|
| 647 |
|
| 648 |
/*
|
| 649 |
* RFC 2292 uses IPV6_PKTINFO for both the socket option and the cmsg
|
| 650 |
* type, RFC 3542 changed the socket option to IPV6_RECVPKTINFO. If we
|
| 651 |
* don't have IPV6_RECVPKTINFO we suppose the OS implements the older
|
| 652 |
* RFC and we use IPV6_PKTINFO.
|
| 653 |
*/
|
| 654 |
#ifndef IPV6_RECVPKTINFO
|
| 655 |
#define IPV6_RECVPKTINFO IPV6_PKTINFO
|
| 656 |
#endif
|
| 657 |
/*
|
| 658 |
* Same goes for IPV6_HOPLIMIT -> IPV6_RECVHOPLIMIT.
|
| 659 |
*/
|
| 660 |
#ifndef IPV6_RECVHOPLIMIT
|
| 661 |
#define IPV6_RECVHOPLIMIT IPV6_HOPLIMIT
|
| 662 |
#endif
|
| 663 |
|
| 664 |
|
| 665 |
#define CMSG6_SPACE_PKTINFO CMSG_SPACE(sizeof(struct in6_pktinfo)) |
| 666 |
#define CMSG6_SPACE_TTL CMSG_SPACE(sizeof(int)) |
| 667 |
|
| 668 |
static inline int |
| 669 |
sk_request_cmsg6_pktinfo(sock *s) |
| 670 |
{
|
| 671 |
int y = 1; |
| 672 |
|
| 673 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_RECVPKTINFO, &y, sizeof(y)) < 0) |
| 674 |
ERR("IPV6_RECVPKTINFO");
|
| 675 |
|
| 676 |
return 0; |
| 677 |
} |
| 678 |
|
| 679 |
static inline int |
| 680 |
sk_request_cmsg6_ttl(sock *s) |
| 681 |
{
|
| 682 |
int y = 1; |
| 683 |
|
| 684 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_RECVHOPLIMIT, &y, sizeof(y)) < 0) |
| 685 |
ERR("IPV6_RECVHOPLIMIT");
|
| 686 |
|
| 687 |
return 0; |
| 688 |
} |
| 689 |
|
| 690 |
static inline void |
| 691 |
sk_process_cmsg6_pktinfo(sock *s, struct cmsghdr *cm)
|
| 692 |
{
|
| 693 |
if (cm->cmsg_type == IPV6_PKTINFO)
|
| 694 |
{
|
| 695 |
struct in6_pktinfo *pi = (struct in6_pktinfo *) CMSG_DATA(cm); |
| 696 |
s->laddr = ipa_from_in6(pi->ipi6_addr); |
| 697 |
s->lifindex = pi->ipi6_ifindex; |
| 698 |
} |
| 699 |
} |
| 700 |
|
| 701 |
static inline void |
| 702 |
sk_process_cmsg6_ttl(sock *s, struct cmsghdr *cm)
|
| 703 |
{
|
| 704 |
if (cm->cmsg_type == IPV6_HOPLIMIT)
|
| 705 |
s->rcv_ttl = * (int *) CMSG_DATA(cm);
|
| 706 |
} |
| 707 |
|
| 708 |
static inline void |
| 709 |
sk_prepare_cmsgs6(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen) |
| 710 |
{
|
| 711 |
struct cmsghdr *cm;
|
| 712 |
struct in6_pktinfo *pi;
|
| 713 |
int controllen = 0; |
| 714 |
|
| 715 |
msg->msg_control = cbuf; |
| 716 |
msg->msg_controllen = cbuflen; |
| 717 |
|
| 718 |
cm = CMSG_FIRSTHDR(msg); |
| 719 |
cm->cmsg_level = SOL_IPV6; |
| 720 |
cm->cmsg_type = IPV6_PKTINFO; |
| 721 |
cm->cmsg_len = CMSG_LEN(sizeof(*pi));
|
| 722 |
controllen += CMSG_SPACE(sizeof(*pi));
|
| 723 |
|
| 724 |
pi = (struct in6_pktinfo *) CMSG_DATA(cm);
|
| 725 |
pi->ipi6_ifindex = s->iface ? s->iface->index : 0;
|
| 726 |
pi->ipi6_addr = ipa_to_in6(s->saddr); |
| 727 |
|
| 728 |
msg->msg_controllen = controllen; |
| 729 |
} |
| 730 |
|
| 731 |
|
| 732 |
/*
|
| 733 |
* Miscellaneous socket syscalls
|
| 734 |
*/
|
| 735 |
|
| 736 |
static inline int |
| 737 |
sk_set_ttl4(sock *s, int ttl)
|
| 738 |
{
|
| 739 |
if (setsockopt(s->fd, SOL_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) |
| 740 |
ERR("IP_TTL");
|
| 741 |
|
| 742 |
return 0; |
| 743 |
} |
| 744 |
|
| 745 |
static inline int |
| 746 |
sk_set_ttl6(sock *s, int ttl)
|
| 747 |
{
|
| 748 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0) |
| 749 |
ERR("IPV6_UNICAST_HOPS");
|
| 750 |
|
| 751 |
return 0; |
| 752 |
} |
| 753 |
|
| 754 |
static inline int |
| 755 |
sk_set_tos4(sock *s, int tos)
|
| 756 |
{
|
| 757 |
if (setsockopt(s->fd, SOL_IP, IP_TOS, &tos, sizeof(tos)) < 0) |
| 758 |
ERR("IP_TOS");
|
| 759 |
|
| 760 |
return 0; |
| 761 |
} |
| 762 |
|
| 763 |
static inline int |
| 764 |
sk_set_tos6(sock *s, int tos)
|
| 765 |
{
|
| 766 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0) |
| 767 |
ERR("IPV6_TCLASS");
|
| 768 |
|
| 769 |
return 0; |
| 770 |
} |
| 771 |
|
| 772 |
static inline int |
| 773 |
sk_set_high_port(sock *s) |
| 774 |
{
|
| 775 |
/* Port range setting is optional, ignore it if not supported */
|
| 776 |
|
| 777 |
#ifdef IP_PORTRANGE
|
| 778 |
if (sk_is_ipv4(s))
|
| 779 |
{
|
| 780 |
int range = IP_PORTRANGE_HIGH;
|
| 781 |
if (setsockopt(s->fd, SOL_IP, IP_PORTRANGE, &range, sizeof(range)) < 0) |
| 782 |
ERR("IP_PORTRANGE");
|
| 783 |
} |
| 784 |
#endif
|
| 785 |
|
| 786 |
#ifdef IPV6_PORTRANGE
|
| 787 |
if (sk_is_ipv6(s))
|
| 788 |
{
|
| 789 |
int range = IPV6_PORTRANGE_HIGH;
|
| 790 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_PORTRANGE, &range, sizeof(range)) < 0) |
| 791 |
ERR("IPV6_PORTRANGE");
|
| 792 |
} |
| 793 |
#endif
|
| 794 |
|
| 795 |
return 0; |
| 796 |
} |
| 797 |
|
| 798 |
static inline byte * |
| 799 |
sk_skip_ip_header(byte *pkt, int *len)
|
| 800 |
{
|
| 801 |
if ((*len < 20) || ((*pkt & 0xf0) != 0x40)) |
| 802 |
return NULL; |
| 803 |
|
| 804 |
int hlen = (*pkt & 0x0f) * 4; |
| 805 |
if ((hlen < 20) || (hlen > *len)) |
| 806 |
return NULL; |
| 807 |
|
| 808 |
*len -= hlen; |
| 809 |
return pkt + hlen;
|
| 810 |
} |
| 811 |
|
| 812 |
byte * |
| 813 |
sk_rx_buffer(sock *s, int *len)
|
| 814 |
{
|
| 815 |
if (sk_is_ipv4(s) && (s->type == SK_IP))
|
| 816 |
return sk_skip_ip_header(s->rbuf, len);
|
| 817 |
else
|
| 818 |
return s->rbuf;
|
| 819 |
} |
| 820 |
|
| 821 |
|
| 822 |
/*
|
| 823 |
* Public socket functions
|
| 824 |
*/
|
| 825 |
|
| 826 |
/**
|
| 827 |
* sk_setup_multicast - enable multicast for given socket
|
| 828 |
* @s: socket
|
| 829 |
*
|
| 830 |
* Prepare transmission of multicast packets for given datagram socket.
|
| 831 |
* The socket must have defined @iface.
|
| 832 |
*
|
| 833 |
* Result: 0 for success, -1 for an error.
|
| 834 |
*/
|
| 835 |
|
| 836 |
int
|
| 837 |
sk_setup_multicast(sock *s) |
| 838 |
{
|
| 839 |
ASSERT(s->iface); |
| 840 |
|
| 841 |
if (sk_is_ipv4(s))
|
| 842 |
return sk_setup_multicast4(s);
|
| 843 |
else
|
| 844 |
return sk_setup_multicast6(s);
|
| 845 |
} |
| 846 |
|
| 847 |
/**
|
| 848 |
* sk_join_group - join multicast group for given socket
|
| 849 |
* @s: socket
|
| 850 |
* @maddr: multicast address
|
| 851 |
*
|
| 852 |
* Join multicast group for given datagram socket and associated interface.
|
| 853 |
* The socket must have defined @iface.
|
| 854 |
*
|
| 855 |
* Result: 0 for success, -1 for an error.
|
| 856 |
*/
|
| 857 |
|
| 858 |
int
|
| 859 |
sk_join_group(sock *s, ip_addr maddr) |
| 860 |
{
|
| 861 |
if (sk_is_ipv4(s))
|
| 862 |
return sk_join_group4(s, maddr);
|
| 863 |
else
|
| 864 |
return sk_join_group6(s, maddr);
|
| 865 |
} |
| 866 |
|
| 867 |
/**
|
| 868 |
* sk_leave_group - leave multicast group for given socket
|
| 869 |
* @s: socket
|
| 870 |
* @maddr: multicast address
|
| 871 |
*
|
| 872 |
* Leave multicast group for given datagram socket and associated interface.
|
| 873 |
* The socket must have defined @iface.
|
| 874 |
*
|
| 875 |
* Result: 0 for success, -1 for an error.
|
| 876 |
*/
|
| 877 |
|
| 878 |
int
|
| 879 |
sk_leave_group(sock *s, ip_addr maddr) |
| 880 |
{
|
| 881 |
if (sk_is_ipv4(s))
|
| 882 |
return sk_leave_group4(s, maddr);
|
| 883 |
else
|
| 884 |
return sk_leave_group6(s, maddr);
|
| 885 |
} |
| 886 |
|
| 887 |
/**
|
| 888 |
* sk_setup_broadcast - enable broadcast for given socket
|
| 889 |
* @s: socket
|
| 890 |
*
|
| 891 |
* Allow reception and transmission of broadcast packets for given datagram
|
| 892 |
* socket. The socket must have defined @iface. For transmission, packets should
|
| 893 |
* be send to @brd address of @iface.
|
| 894 |
*
|
| 895 |
* Result: 0 for success, -1 for an error.
|
| 896 |
*/
|
| 897 |
|
| 898 |
int
|
| 899 |
sk_setup_broadcast(sock *s) |
| 900 |
{
|
| 901 |
int y = 1; |
| 902 |
|
| 903 |
if (setsockopt(s->fd, SOL_SOCKET, SO_BROADCAST, &y, sizeof(y)) < 0) |
| 904 |
ERR("SO_BROADCAST");
|
| 905 |
|
| 906 |
return 0; |
| 907 |
} |
| 908 |
|
| 909 |
/**
|
| 910 |
* sk_set_ttl - set transmit TTL for given socket
|
| 911 |
* @s: socket
|
| 912 |
* @ttl: TTL value
|
| 913 |
*
|
| 914 |
* Set TTL for already opened connections when TTL was not set before. Useful
|
| 915 |
* for accepted connections when different ones should have different TTL.
|
| 916 |
*
|
| 917 |
* Result: 0 for success, -1 for an error.
|
| 918 |
*/
|
| 919 |
|
| 920 |
int
|
| 921 |
sk_set_ttl(sock *s, int ttl)
|
| 922 |
{
|
| 923 |
s->ttl = ttl; |
| 924 |
|
| 925 |
if (sk_is_ipv4(s))
|
| 926 |
return sk_set_ttl4(s, ttl);
|
| 927 |
else
|
| 928 |
return sk_set_ttl6(s, ttl);
|
| 929 |
} |
| 930 |
|
| 931 |
/**
|
| 932 |
* sk_set_min_ttl - set minimal accepted TTL for given socket
|
| 933 |
* @s: socket
|
| 934 |
* @ttl: TTL value
|
| 935 |
*
|
| 936 |
* Set minimal accepted TTL for given socket. Can be used for TTL security.
|
| 937 |
* implementations.
|
| 938 |
*
|
| 939 |
* Result: 0 for success, -1 for an error.
|
| 940 |
*/
|
| 941 |
|
| 942 |
int
|
| 943 |
sk_set_min_ttl(sock *s, int ttl)
|
| 944 |
{
|
| 945 |
if (sk_is_ipv4(s))
|
| 946 |
return sk_set_min_ttl4(s, ttl);
|
| 947 |
else
|
| 948 |
return sk_set_min_ttl6(s, ttl);
|
| 949 |
} |
| 950 |
|
| 951 |
#if 0
|
| 952 |
/**
|
| 953 |
* sk_set_md5_auth - add / remove MD5 security association for given socket
|
| 954 |
* @s: socket
|
| 955 |
* @local: IP address of local side
|
| 956 |
* @remote: IP address of remote side
|
| 957 |
* @ifa: Interface for link-local IP address
|
| 958 |
* @passwd: Password used for MD5 authentication
|
| 959 |
* @setkey: Update also system SA/SP database
|
| 960 |
*
|
| 961 |
* In TCP MD5 handling code in kernel, there is a set of security associations
|
| 962 |
* used for choosing password and other authentication parameters according to
|
| 963 |
* the local and remote address. This function is useful for listening socket,
|
| 964 |
* for active sockets it may be enough to set s->password field.
|
| 965 |
*
|
| 966 |
* When called with passwd != NULL, the new pair is added,
|
| 967 |
* When called with passwd == NULL, the existing pair is removed.
|
| 968 |
*
|
| 969 |
* Note that while in Linux, the MD5 SAs are specific to socket, in BSD they are
|
| 970 |
* stored in global SA/SP database (but the behavior also must be enabled on
|
| 971 |
* per-socket basis). In case of multiple sockets to the same neighbor, the
|
| 972 |
* socket-specific state must be configured for each socket while global state
|
| 973 |
* just once per src-dst pair. The @setkey argument controls whether the global
|
| 974 |
* state (SA/SP database) is also updated.
|
| 975 |
*
|
| 976 |
* Result: 0 for success, -1 for an error.
|
| 977 |
*/
|
| 978 |
|
| 979 |
int
|
| 980 |
sk_set_md5_auth(sock *s, ip_addr local, ip_addr remote, struct iface *ifa, char *passwd, int setkey)
|
| 981 |
{ DUMMY; }
|
| 982 |
#endif
|
| 983 |
|
| 984 |
/**
|
| 985 |
* sk_set_ipv6_checksum - specify IPv6 checksum offset for given socket
|
| 986 |
* @s: socket
|
| 987 |
* @offset: offset
|
| 988 |
*
|
| 989 |
* Specify IPv6 checksum field offset for given raw IPv6 socket. After that, the
|
| 990 |
* kernel will automatically fill it for outgoing packets and check it for
|
| 991 |
* incoming packets. Should not be used on ICMPv6 sockets, where the position is
|
| 992 |
* known to the kernel.
|
| 993 |
*
|
| 994 |
* Result: 0 for success, -1 for an error.
|
| 995 |
*/
|
| 996 |
|
| 997 |
int
|
| 998 |
sk_set_ipv6_checksum(sock *s, int offset)
|
| 999 |
{
|
| 1000 |
if (setsockopt(s->fd, SOL_IPV6, IPV6_CHECKSUM, &offset, sizeof(offset)) < 0) |
| 1001 |
ERR("IPV6_CHECKSUM");
|
| 1002 |
|
| 1003 |
return 0; |
| 1004 |
} |
| 1005 |
|
| 1006 |
int
|
| 1007 |
sk_set_icmp6_filter(sock *s, int p1, int p2) |
| 1008 |
{
|
| 1009 |
/* a bit of lame interface, but it is here only for Radv */
|
| 1010 |
struct icmp6_filter f;
|
| 1011 |
|
| 1012 |
ICMP6_FILTER_SETBLOCKALL(&f); |
| 1013 |
ICMP6_FILTER_SETPASS(p1, &f); |
| 1014 |
ICMP6_FILTER_SETPASS(p2, &f); |
| 1015 |
|
| 1016 |
if (setsockopt(s->fd, SOL_ICMPV6, ICMP6_FILTER, &f, sizeof(f)) < 0) |
| 1017 |
ERR("ICMP6_FILTER");
|
| 1018 |
|
| 1019 |
return 0; |
| 1020 |
} |
| 1021 |
|
| 1022 |
void
|
| 1023 |
sk_log_error(sock *s, const char *p) |
| 1024 |
{
|
| 1025 |
log(L_ERR "%s: Socket error: %s%#m", p, s->err);
|
| 1026 |
} |
| 1027 |
|
| 1028 |
|
| 1029 |
/*
|
| 1030 |
* Actual struct birdsock code
|
| 1031 |
*/
|
| 1032 |
|
| 1033 |
static list sock_list;
|
| 1034 |
static struct birdsock *current_sock; |
| 1035 |
static struct birdsock *stored_sock; |
| 1036 |
|
| 1037 |
static inline sock * |
| 1038 |
sk_next(sock *s) |
| 1039 |
{
|
| 1040 |
if (!s->n.next->next)
|
| 1041 |
return NULL; |
| 1042 |
else
|
| 1043 |
return SKIP_BACK(sock, n, s->n.next);
|
| 1044 |
} |
| 1045 |
|
| 1046 |
static void |
| 1047 |
sk_alloc_bufs(sock *s) |
| 1048 |
{
|
| 1049 |
if (!s->rbuf && s->rbsize)
|
| 1050 |
s->rbuf = s->rbuf_alloc = xmalloc(s->rbsize); |
| 1051 |
s->rpos = s->rbuf; |
| 1052 |
if (!s->tbuf && s->tbsize)
|
| 1053 |
s->tbuf = s->tbuf_alloc = xmalloc(s->tbsize); |
| 1054 |
s->tpos = s->ttx = s->tbuf; |
| 1055 |
} |
| 1056 |
|
| 1057 |
static void |
| 1058 |
sk_free_bufs(sock *s) |
| 1059 |
{
|
| 1060 |
if (s->rbuf_alloc)
|
| 1061 |
{
|
| 1062 |
xfree(s->rbuf_alloc); |
| 1063 |
s->rbuf = s->rbuf_alloc = NULL;
|
| 1064 |
} |
| 1065 |
if (s->tbuf_alloc)
|
| 1066 |
{
|
| 1067 |
xfree(s->tbuf_alloc); |
| 1068 |
s->tbuf = s->tbuf_alloc = NULL;
|
| 1069 |
} |
| 1070 |
} |
| 1071 |
|
| 1072 |
static void |
| 1073 |
sk_free(resource *r) |
| 1074 |
{
|
| 1075 |
sock *s = (sock *) r; |
| 1076 |
|
| 1077 |
sk_free_bufs(s); |
| 1078 |
if (s->fd >= 0) |
| 1079 |
{
|
| 1080 |
close(s->fd); |
| 1081 |
|
| 1082 |
/* FIXME: we should call sk_stop() for SKF_THREAD sockets */
|
| 1083 |
if (s->flags & SKF_THREAD)
|
| 1084 |
return;
|
| 1085 |
|
| 1086 |
if (s == current_sock)
|
| 1087 |
current_sock = sk_next(s); |
| 1088 |
if (s == stored_sock)
|
| 1089 |
stored_sock = sk_next(s); |
| 1090 |
rem_node(&s->n); |
| 1091 |
} |
| 1092 |
} |
| 1093 |
|
| 1094 |
void
|
| 1095 |
sk_set_rbsize(sock *s, uint val) |
| 1096 |
{
|
| 1097 |
ASSERT(s->rbuf_alloc == s->rbuf); |
| 1098 |
|
| 1099 |
if (s->rbsize == val)
|
| 1100 |
return;
|
| 1101 |
|
| 1102 |
s->rbsize = val; |
| 1103 |
xfree(s->rbuf_alloc); |
| 1104 |
s->rbuf_alloc = xmalloc(val); |
| 1105 |
s->rpos = s->rbuf = s->rbuf_alloc; |
| 1106 |
} |
| 1107 |
|
| 1108 |
void
|
| 1109 |
sk_set_tbsize(sock *s, uint val) |
| 1110 |
{
|
| 1111 |
ASSERT(s->tbuf_alloc == s->tbuf); |
| 1112 |
|
| 1113 |
if (s->tbsize == val)
|
| 1114 |
return;
|
| 1115 |
|
| 1116 |
byte *old_tbuf = s->tbuf; |
| 1117 |
|
| 1118 |
s->tbsize = val; |
| 1119 |
s->tbuf = s->tbuf_alloc = xrealloc(s->tbuf_alloc, val); |
| 1120 |
s->tpos = s->tbuf + (s->tpos - old_tbuf); |
| 1121 |
s->ttx = s->tbuf + (s->ttx - old_tbuf); |
| 1122 |
} |
| 1123 |
|
| 1124 |
void
|
| 1125 |
sk_set_tbuf(sock *s, void *tbuf)
|
| 1126 |
{
|
| 1127 |
s->tbuf = tbuf ?: s->tbuf_alloc; |
| 1128 |
s->ttx = s->tpos = s->tbuf; |
| 1129 |
} |
| 1130 |
|
| 1131 |
void
|
| 1132 |
sk_reallocate(sock *s) |
| 1133 |
{
|
| 1134 |
sk_free_bufs(s); |
| 1135 |
sk_alloc_bufs(s); |
| 1136 |
} |
| 1137 |
|
| 1138 |
static void |
| 1139 |
sk_dump(resource *r) |
| 1140 |
{
|
| 1141 |
sock *s = (sock *) r; |
| 1142 |
static char *sk_type_names[] = { "TCP<", "TCP>", "TCP", "UDP", NULL, "IP", NULL, "MAGIC", "UNIX<", "UNIX", "DEL!" }; |
| 1143 |
|
| 1144 |
debug("(%s, ud=%p, sa=%I, sp=%d, da=%I, dp=%d, tos=%d, ttl=%d, if=%s)\n",
|
| 1145 |
sk_type_names[s->type], |
| 1146 |
s->data, |
| 1147 |
s->saddr, |
| 1148 |
s->sport, |
| 1149 |
s->daddr, |
| 1150 |
s->dport, |
| 1151 |
s->tos, |
| 1152 |
s->ttl, |
| 1153 |
s->iface ? s->iface->name : "none");
|
| 1154 |
} |
| 1155 |
|
| 1156 |
static struct resclass sk_class = { |
| 1157 |
"Socket",
|
| 1158 |
sizeof(sock),
|
| 1159 |
sk_free, |
| 1160 |
sk_dump, |
| 1161 |
NULL,
|
| 1162 |
NULL
|
| 1163 |
}; |
| 1164 |
|
| 1165 |
/**
|
| 1166 |
* sk_new - create a socket
|
| 1167 |
* @p: pool
|
| 1168 |
*
|
| 1169 |
* This function creates a new socket resource. If you want to use it,
|
| 1170 |
* you need to fill in all the required fields of the structure and
|
| 1171 |
* call sk_open() to do the actual opening of the socket.
|
| 1172 |
*
|
| 1173 |
* The real function name is sock_new(), sk_new() is a macro wrapper
|
| 1174 |
* to avoid collision with OpenSSL.
|
| 1175 |
*/
|
| 1176 |
sock * |
| 1177 |
sock_new(pool *p) |
| 1178 |
{
|
| 1179 |
sock *s = ralloc(p, &sk_class); |
| 1180 |
s->pool = p; |
| 1181 |
// s->saddr = s->daddr = IPA_NONE;
|
| 1182 |
s->tos = s->priority = s->ttl = -1;
|
| 1183 |
s->fd = -1;
|
| 1184 |
return s;
|
| 1185 |
} |
| 1186 |
|
| 1187 |
static int |
| 1188 |
sk_setup(sock *s) |
| 1189 |
{
|
| 1190 |
int y = 1; |
| 1191 |
int fd = s->fd;
|
| 1192 |
|
| 1193 |
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
| 1194 |
ERR("O_NONBLOCK");
|
| 1195 |
|
| 1196 |
if (!s->af)
|
| 1197 |
return 0; |
| 1198 |
|
| 1199 |
if (ipa_nonzero(s->saddr) && !(s->flags & SKF_BIND))
|
| 1200 |
s->flags |= SKF_PKTINFO; |
| 1201 |
|
| 1202 |
#ifdef CONFIG_USE_HDRINCL
|
| 1203 |
if (sk_is_ipv4(s) && (s->type == SK_IP) && (s->flags & SKF_PKTINFO))
|
| 1204 |
{
|
| 1205 |
s->flags &= ~SKF_PKTINFO; |
| 1206 |
s->flags |= SKF_HDRINCL; |
| 1207 |
if (setsockopt(fd, SOL_IP, IP_HDRINCL, &y, sizeof(y)) < 0) |
| 1208 |
ERR("IP_HDRINCL");
|
| 1209 |
} |
| 1210 |
#endif
|
| 1211 |
|
| 1212 |
if (s->iface)
|
| 1213 |
{
|
| 1214 |
#ifdef SO_BINDTODEVICE
|
| 1215 |
struct ifreq ifr = {};
|
| 1216 |
strcpy(ifr.ifr_name, s->iface->name); |
| 1217 |
if (setsockopt(s->fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0) |
| 1218 |
ERR("SO_BINDTODEVICE");
|
| 1219 |
#endif
|
| 1220 |
|
| 1221 |
#ifdef CONFIG_UNIX_DONTROUTE
|
| 1222 |
if (setsockopt(s->fd, SOL_SOCKET, SO_DONTROUTE, &y, sizeof(y)) < 0) |
| 1223 |
ERR("SO_DONTROUTE");
|
| 1224 |
#endif
|
| 1225 |
} |
| 1226 |
|
| 1227 |
if (s->priority >= 0) |
| 1228 |
if (sk_set_priority(s, s->priority) < 0) |
| 1229 |
return -1; |
| 1230 |
|
| 1231 |
if (sk_is_ipv4(s))
|
| 1232 |
{
|
| 1233 |
if (s->flags & SKF_LADDR_RX)
|
| 1234 |
if (sk_request_cmsg4_pktinfo(s) < 0) |
| 1235 |
return -1; |
| 1236 |
|
| 1237 |
if (s->flags & SKF_TTL_RX)
|
| 1238 |
if (sk_request_cmsg4_ttl(s) < 0) |
| 1239 |
return -1; |
| 1240 |
|
| 1241 |
if ((s->type == SK_UDP) || (s->type == SK_IP))
|
| 1242 |
if (sk_disable_mtu_disc4(s) < 0) |
| 1243 |
return -1; |
| 1244 |
|
| 1245 |
if (s->ttl >= 0) |
| 1246 |
if (sk_set_ttl4(s, s->ttl) < 0) |
| 1247 |
return -1; |
| 1248 |
|
| 1249 |
if (s->tos >= 0) |
| 1250 |
if (sk_set_tos4(s, s->tos) < 0) |
| 1251 |
return -1; |
| 1252 |
} |
| 1253 |
|
| 1254 |
if (sk_is_ipv6(s))
|
| 1255 |
{
|
| 1256 |
if (s->flags & SKF_V6ONLY)
|
| 1257 |
if (setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, &y, sizeof(y)) < 0) |
| 1258 |
ERR("IPV6_V6ONLY");
|
| 1259 |
|
| 1260 |
if (s->flags & SKF_LADDR_RX)
|
| 1261 |
if (sk_request_cmsg6_pktinfo(s) < 0) |
| 1262 |
return -1; |
| 1263 |
|
| 1264 |
if (s->flags & SKF_TTL_RX)
|
| 1265 |
if (sk_request_cmsg6_ttl(s) < 0) |
| 1266 |
return -1; |
| 1267 |
|
| 1268 |
if ((s->type == SK_UDP) || (s->type == SK_IP))
|
| 1269 |
if (sk_disable_mtu_disc6(s) < 0) |
| 1270 |
return -1; |
| 1271 |
|
| 1272 |
if (s->ttl >= 0) |
| 1273 |
if (sk_set_ttl6(s, s->ttl) < 0) |
| 1274 |
return -1; |
| 1275 |
|
| 1276 |
if (s->tos >= 0) |
| 1277 |
if (sk_set_tos6(s, s->tos) < 0) |
| 1278 |
return -1; |
| 1279 |
} |
| 1280 |
|
| 1281 |
return 0; |
| 1282 |
} |
| 1283 |
|
| 1284 |
static void |
| 1285 |
sk_insert(sock *s) |
| 1286 |
{
|
| 1287 |
add_tail(&sock_list, &s->n); |
| 1288 |
} |
| 1289 |
|
| 1290 |
static void |
| 1291 |
sk_tcp_connected(sock *s) |
| 1292 |
{
|
| 1293 |
sockaddr sa; |
| 1294 |
int sa_len = sizeof(sa); |
| 1295 |
|
| 1296 |
if ((getsockname(s->fd, &sa.sa, &sa_len) < 0) || |
| 1297 |
(sockaddr_read(&sa, s->af, &s->saddr, &s->iface, &s->sport) < 0))
|
| 1298 |
log(L_WARN "SOCK: Cannot get local IP address for TCP>");
|
| 1299 |
|
| 1300 |
s->type = SK_TCP; |
| 1301 |
sk_alloc_bufs(s); |
| 1302 |
s->tx_hook(s); |
| 1303 |
} |
| 1304 |
|
| 1305 |
static int |
| 1306 |
sk_passive_connected(sock *s, int type)
|
| 1307 |
{
|
| 1308 |
sockaddr loc_sa, rem_sa; |
| 1309 |
int loc_sa_len = sizeof(loc_sa); |
| 1310 |
int rem_sa_len = sizeof(rem_sa); |
| 1311 |
|
| 1312 |
int fd = accept(s->fd, ((type == SK_TCP) ? &rem_sa.sa : NULL), &rem_sa_len); |
| 1313 |
if (fd < 0) |
| 1314 |
{
|
| 1315 |
if ((errno != EINTR) && (errno != EAGAIN))
|
| 1316 |
s->err_hook(s, errno); |
| 1317 |
return 0; |
| 1318 |
} |
| 1319 |
|
| 1320 |
sock *t = sk_new(s->pool); |
| 1321 |
t->type = type; |
| 1322 |
t->fd = fd; |
| 1323 |
t->af = s->af; |
| 1324 |
t->ttl = s->ttl; |
| 1325 |
t->tos = s->tos; |
| 1326 |
t->rbsize = s->rbsize; |
| 1327 |
t->tbsize = s->tbsize; |
| 1328 |
|
| 1329 |
if (type == SK_TCP)
|
| 1330 |
{
|
| 1331 |
if ((getsockname(fd, &loc_sa.sa, &loc_sa_len) < 0) || |
| 1332 |
(sockaddr_read(&loc_sa, s->af, &t->saddr, &t->iface, &t->sport) < 0))
|
| 1333 |
log(L_WARN "SOCK: Cannot get local IP address for TCP<");
|
| 1334 |
|
| 1335 |
if (sockaddr_read(&rem_sa, s->af, &t->daddr, &t->iface, &t->dport) < 0) |
| 1336 |
log(L_WARN "SOCK: Cannot get remote IP address for TCP<");
|
| 1337 |
} |
| 1338 |
|
| 1339 |
if (sk_setup(t) < 0) |
| 1340 |
{
|
| 1341 |
/* FIXME: Call err_hook instead ? */
|
| 1342 |
log(L_ERR "SOCK: Incoming connection: %s%#m", t->err);
|
| 1343 |
|
| 1344 |
/* FIXME: handle it better in rfree() */
|
| 1345 |
close(t->fd); |
| 1346 |
t->fd = -1;
|
| 1347 |
rfree(t); |
| 1348 |
return 1; |
| 1349 |
} |
| 1350 |
|
| 1351 |
sk_insert(t); |
| 1352 |
sk_alloc_bufs(t); |
| 1353 |
s->rx_hook(t, 0);
|
| 1354 |
return 1; |
| 1355 |
} |
| 1356 |
|
| 1357 |
/**
|
| 1358 |
* sk_open - open a socket
|
| 1359 |
* @s: socket
|
| 1360 |
*
|
| 1361 |
* This function takes a socket resource created by sk_new() and
|
| 1362 |
* initialized by the user and binds a corresponding network connection
|
| 1363 |
* to it.
|
| 1364 |
*
|
| 1365 |
* Result: 0 for success, -1 for an error.
|
| 1366 |
*/
|
| 1367 |
int
|
| 1368 |
sk_open(sock *s) |
| 1369 |
{
|
| 1370 |
int af = BIRD_AF;
|
| 1371 |
int fd = -1; |
| 1372 |
int do_bind = 0; |
| 1373 |
int bind_port = 0; |
| 1374 |
ip_addr bind_addr = IPA_NONE; |
| 1375 |
sockaddr sa; |
| 1376 |
|
| 1377 |
switch (s->type)
|
| 1378 |
{
|
| 1379 |
case SK_TCP_ACTIVE:
|
| 1380 |
s->ttx = ""; /* Force s->ttx != s->tpos */ |
| 1381 |
/* Fall thru */
|
| 1382 |
case SK_TCP_PASSIVE:
|
| 1383 |
fd = socket(af, SOCK_STREAM, IPPROTO_TCP); |
| 1384 |
bind_port = s->sport; |
| 1385 |
bind_addr = s->saddr; |
| 1386 |
do_bind = bind_port || ipa_nonzero(bind_addr); |
| 1387 |
break;
|
| 1388 |
|
| 1389 |
case SK_UDP:
|
| 1390 |
fd = socket(af, SOCK_DGRAM, IPPROTO_UDP); |
| 1391 |
bind_port = s->sport; |
| 1392 |
bind_addr = (s->flags & SKF_BIND) ? s->saddr : IPA_NONE; |
| 1393 |
do_bind = 1;
|
| 1394 |
break;
|
| 1395 |
|
| 1396 |
case SK_IP:
|
| 1397 |
fd = socket(af, SOCK_RAW, s->dport); |
| 1398 |
bind_port = 0;
|
| 1399 |
bind_addr = (s->flags & SKF_BIND) ? s->saddr : IPA_NONE; |
| 1400 |
do_bind = ipa_nonzero(bind_addr); |
| 1401 |
break;
|
| 1402 |
|
| 1403 |
case SK_MAGIC:
|
| 1404 |
af = 0;
|
| 1405 |
fd = s->fd; |
| 1406 |
break;
|
| 1407 |
|
| 1408 |
default:
|
| 1409 |
bug("sk_open() called for invalid sock type %d", s->type);
|
| 1410 |
} |
| 1411 |
|
| 1412 |
if (fd < 0) |
| 1413 |
ERR("socket");
|
| 1414 |
|
| 1415 |
s->af = af; |
| 1416 |
s->fd = fd; |
| 1417 |
|
| 1418 |
if (sk_setup(s) < 0) |
| 1419 |
goto err;
|
| 1420 |
|
| 1421 |
if (do_bind)
|
| 1422 |
{
|
| 1423 |
if (bind_port)
|
| 1424 |
{
|
| 1425 |
int y = 1; |
| 1426 |
|
| 1427 |
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &y, sizeof(y)) < 0) |
| 1428 |
ERR2("SO_REUSEADDR");
|
| 1429 |
|
| 1430 |
#ifdef CONFIG_NO_IFACE_BIND
|
| 1431 |
/* Workaround missing ability to bind to an iface */
|
| 1432 |
if ((s->type == SK_UDP) && s->iface && ipa_zero(bind_addr))
|
| 1433 |
{
|
| 1434 |
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &y, sizeof(y)) < 0) |
| 1435 |
ERR2("SO_REUSEPORT");
|
| 1436 |
} |
| 1437 |
#endif
|
| 1438 |
} |
| 1439 |
else
|
| 1440 |
if (s->flags & SKF_HIGH_PORT)
|
| 1441 |
if (sk_set_high_port(s) < 0) |
| 1442 |
log(L_WARN "Socket error: %s%#m", s->err);
|
| 1443 |
|
| 1444 |
sockaddr_fill(&sa, af, bind_addr, s->iface, bind_port); |
| 1445 |
if (bind(fd, &sa.sa, SA_LEN(sa)) < 0) |
| 1446 |
ERR2("bind");
|
| 1447 |
} |
| 1448 |
|
| 1449 |
if (s->password)
|
| 1450 |
if (sk_set_md5_auth(s, s->saddr, s->daddr, s->iface, s->password, 0) < 0) |
| 1451 |
goto err;
|
| 1452 |
|
| 1453 |
switch (s->type)
|
| 1454 |
{
|
| 1455 |
case SK_TCP_ACTIVE:
|
| 1456 |
sockaddr_fill(&sa, af, s->daddr, s->iface, s->dport); |
| 1457 |
if (connect(fd, &sa.sa, SA_LEN(sa)) >= 0) |
| 1458 |
sk_tcp_connected(s); |
| 1459 |
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS && |
| 1460 |
errno != ECONNREFUSED && errno != EHOSTUNREACH && errno != ENETUNREACH) |
| 1461 |
ERR2("connect");
|
| 1462 |
break;
|
| 1463 |
|
| 1464 |
case SK_TCP_PASSIVE:
|
| 1465 |
if (listen(fd, 8) < 0) |
| 1466 |
ERR2("listen");
|
| 1467 |
break;
|
| 1468 |
|
| 1469 |
case SK_MAGIC:
|
| 1470 |
break;
|
| 1471 |
|
| 1472 |
default:
|
| 1473 |
sk_alloc_bufs(s); |
| 1474 |
} |
| 1475 |
|
| 1476 |
if (!(s->flags & SKF_THREAD))
|
| 1477 |
sk_insert(s); |
| 1478 |
return 0; |
| 1479 |
|
| 1480 |
err:
|
| 1481 |
close(fd); |
| 1482 |
s->fd = -1;
|
| 1483 |
return -1; |
| 1484 |
} |
| 1485 |
|
| 1486 |
int
|
| 1487 |
sk_open_unix(sock *s, char *name)
|
| 1488 |
{
|
| 1489 |
struct sockaddr_un sa;
|
| 1490 |
int fd;
|
| 1491 |
|
| 1492 |
/* We are sloppy during error (leak fd and not set s->err), but we die anyway */
|
| 1493 |
|
| 1494 |
fd = socket(AF_UNIX, SOCK_STREAM, 0);
|
| 1495 |
if (fd < 0) |
| 1496 |
return -1; |
| 1497 |
|
| 1498 |
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
| 1499 |
return -1; |
| 1500 |
|
| 1501 |
/* Path length checked in test_old_bird() */
|
| 1502 |
sa.sun_family = AF_UNIX; |
| 1503 |
strcpy(sa.sun_path, name); |
| 1504 |
|
| 1505 |
if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) < 0) |
| 1506 |
return -1; |
| 1507 |
|
| 1508 |
if (listen(fd, 8) < 0) |
| 1509 |
return -1; |
| 1510 |
|
| 1511 |
s->fd = fd; |
| 1512 |
sk_insert(s); |
| 1513 |
return 0; |
| 1514 |
} |
| 1515 |
|
| 1516 |
|
| 1517 |
#define CMSG_RX_SPACE MAX(CMSG4_SPACE_PKTINFO+CMSG4_SPACE_TTL, \
|
| 1518 |
CMSG6_SPACE_PKTINFO+CMSG6_SPACE_TTL) |
| 1519 |
#define CMSG_TX_SPACE MAX(CMSG4_SPACE_PKTINFO,CMSG6_SPACE_PKTINFO)
|
| 1520 |
|
| 1521 |
static void |
| 1522 |
sk_prepare_cmsgs(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen) |
| 1523 |
{
|
| 1524 |
if (sk_is_ipv4(s))
|
| 1525 |
sk_prepare_cmsgs4(s, msg, cbuf, cbuflen); |
| 1526 |
else
|
| 1527 |
sk_prepare_cmsgs6(s, msg, cbuf, cbuflen); |
| 1528 |
} |
| 1529 |
|
| 1530 |
static void |
| 1531 |
sk_process_cmsgs(sock *s, struct msghdr *msg)
|
| 1532 |
{
|
| 1533 |
struct cmsghdr *cm;
|
| 1534 |
|
| 1535 |
s->laddr = IPA_NONE; |
| 1536 |
s->lifindex = 0;
|
| 1537 |
s->rcv_ttl = -1;
|
| 1538 |
|
| 1539 |
for (cm = CMSG_FIRSTHDR(msg); cm != NULL; cm = CMSG_NXTHDR(msg, cm)) |
| 1540 |
{
|
| 1541 |
if ((cm->cmsg_level == SOL_IP) && sk_is_ipv4(s))
|
| 1542 |
{
|
| 1543 |
sk_process_cmsg4_pktinfo(s, cm); |
| 1544 |
sk_process_cmsg4_ttl(s, cm); |
| 1545 |
} |
| 1546 |
|
| 1547 |
if ((cm->cmsg_level == SOL_IPV6) && sk_is_ipv6(s))
|
| 1548 |
{
|
| 1549 |
sk_process_cmsg6_pktinfo(s, cm); |
| 1550 |
sk_process_cmsg6_ttl(s, cm); |
| 1551 |
} |
| 1552 |
} |
| 1553 |
} |
| 1554 |
|
| 1555 |
|
| 1556 |
static inline int |
| 1557 |
sk_sendmsg(sock *s) |
| 1558 |
{
|
| 1559 |
struct iovec iov = {s->tbuf, s->tpos - s->tbuf};
|
| 1560 |
byte cmsg_buf[CMSG_TX_SPACE]; |
| 1561 |
sockaddr dst; |
| 1562 |
|
| 1563 |
sockaddr_fill(&dst, s->af, s->daddr, s->iface, s->dport); |
| 1564 |
|
| 1565 |
struct msghdr msg = {
|
| 1566 |
.msg_name = &dst.sa, |
| 1567 |
.msg_namelen = SA_LEN(dst), |
| 1568 |
.msg_iov = &iov, |
| 1569 |
.msg_iovlen = 1
|
| 1570 |
}; |
| 1571 |
|
| 1572 |
#ifdef CONFIG_USE_HDRINCL
|
| 1573 |
byte hdr[20];
|
| 1574 |
struct iovec iov2[2] = { {hdr, 20}, iov }; |
| 1575 |
|
| 1576 |
if (s->flags & SKF_HDRINCL)
|
| 1577 |
{
|
| 1578 |
sk_prepare_ip_header(s, hdr, iov.iov_len); |
| 1579 |
msg.msg_iov = iov2; |
| 1580 |
msg.msg_iovlen = 2;
|
| 1581 |
} |
| 1582 |
#endif
|
| 1583 |
|
| 1584 |
if (s->flags & SKF_PKTINFO)
|
| 1585 |
sk_prepare_cmsgs(s, &msg, cmsg_buf, sizeof(cmsg_buf));
|
| 1586 |
|
| 1587 |
return sendmsg(s->fd, &msg, 0); |
| 1588 |
} |
| 1589 |
|
| 1590 |
static inline int |
| 1591 |
sk_recvmsg(sock *s) |
| 1592 |
{
|
| 1593 |
struct iovec iov = {s->rbuf, s->rbsize};
|
| 1594 |
byte cmsg_buf[CMSG_RX_SPACE]; |
| 1595 |
sockaddr src; |
| 1596 |
|
| 1597 |
struct msghdr msg = {
|
| 1598 |
.msg_name = &src.sa, |
| 1599 |
.msg_namelen = sizeof(src), // XXXX ?? |
| 1600 |
.msg_iov = &iov, |
| 1601 |
.msg_iovlen = 1,
|
| 1602 |
.msg_control = cmsg_buf, |
| 1603 |
.msg_controllen = sizeof(cmsg_buf),
|
| 1604 |
.msg_flags = 0
|
| 1605 |
}; |
| 1606 |
|
| 1607 |
int rv = recvmsg(s->fd, &msg, 0); |
| 1608 |
if (rv < 0) |
| 1609 |
return rv;
|
| 1610 |
|
| 1611 |
//ifdef IPV4
|
| 1612 |
// if (cf_type == SK_IP)
|
| 1613 |
// rv = ipv4_skip_header(pbuf, rv);
|
| 1614 |
//endif
|
| 1615 |
|
| 1616 |
sockaddr_read(&src, s->af, &s->faddr, NULL, &s->fport);
|
| 1617 |
sk_process_cmsgs(s, &msg); |
| 1618 |
|
| 1619 |
if (msg.msg_flags & MSG_TRUNC)
|
| 1620 |
s->flags |= SKF_TRUNCATED; |
| 1621 |
else
|
| 1622 |
s->flags &= ~SKF_TRUNCATED; |
| 1623 |
|
| 1624 |
return rv;
|
| 1625 |
} |
| 1626 |
|
| 1627 |
|
| 1628 |
static inline void reset_tx_buffer(sock *s) { s->ttx = s->tpos = s->tbuf; } |
| 1629 |
|
| 1630 |
static int |
| 1631 |
sk_maybe_write(sock *s) |
| 1632 |
{
|
| 1633 |
int e;
|
| 1634 |
|
| 1635 |
switch (s->type)
|
| 1636 |
{
|
| 1637 |
case SK_TCP:
|
| 1638 |
case SK_MAGIC:
|
| 1639 |
case SK_UNIX:
|
| 1640 |
while (s->ttx != s->tpos)
|
| 1641 |
{
|
| 1642 |
e = write(s->fd, s->ttx, s->tpos - s->ttx); |
| 1643 |
|
| 1644 |
if (e < 0) |
| 1645 |
{
|
| 1646 |
if (errno != EINTR && errno != EAGAIN)
|
| 1647 |
{
|
| 1648 |
reset_tx_buffer(s); |
| 1649 |
/* EPIPE is just a connection close notification during TX */
|
| 1650 |
s->err_hook(s, (errno != EPIPE) ? errno : 0);
|
| 1651 |
return -1; |
| 1652 |
} |
| 1653 |
return 0; |
| 1654 |
} |
| 1655 |
s->ttx += e; |
| 1656 |
} |
| 1657 |
reset_tx_buffer(s); |
| 1658 |
return 1; |
| 1659 |
|
| 1660 |
case SK_UDP:
|
| 1661 |
case SK_IP:
|
| 1662 |
{
|
| 1663 |
if (s->tbuf == s->tpos)
|
| 1664 |
return 1; |
| 1665 |
|
| 1666 |
e = sk_sendmsg(s); |
| 1667 |
|
| 1668 |
if (e < 0) |
| 1669 |
{
|
| 1670 |
if (errno != EINTR && errno != EAGAIN)
|
| 1671 |
{
|
| 1672 |
reset_tx_buffer(s); |
| 1673 |
s->err_hook(s, errno); |
| 1674 |
return -1; |
| 1675 |
} |
| 1676 |
|
| 1677 |
if (!s->tx_hook)
|
| 1678 |
reset_tx_buffer(s); |
| 1679 |
return 0; |
| 1680 |
} |
| 1681 |
reset_tx_buffer(s); |
| 1682 |
return 1; |
| 1683 |
} |
| 1684 |
default:
|
| 1685 |
bug("sk_maybe_write: unknown socket type %d", s->type);
|
| 1686 |
} |
| 1687 |
} |
| 1688 |
|
| 1689 |
int
|
| 1690 |
sk_rx_ready(sock *s) |
| 1691 |
{
|
| 1692 |
int rv;
|
| 1693 |
struct pollfd pfd = { .fd = s->fd };
|
| 1694 |
pfd.events |= POLLIN; |
| 1695 |
|
| 1696 |
redo:
|
| 1697 |
rv = poll(&pfd, 1, 0); |
| 1698 |
|
| 1699 |
if ((rv < 0) && (errno == EINTR || errno == EAGAIN)) |
| 1700 |
goto redo;
|
| 1701 |
|
| 1702 |
return rv;
|
| 1703 |
} |
| 1704 |
|
| 1705 |
/**
|
| 1706 |
* sk_send - send data to a socket
|
| 1707 |
* @s: socket
|
| 1708 |
* @len: number of bytes to send
|
| 1709 |
*
|
| 1710 |
* This function sends @len bytes of data prepared in the
|
| 1711 |
* transmit buffer of the socket @s to the network connection.
|
| 1712 |
* If the packet can be sent immediately, it does so and returns
|
| 1713 |
* 1, else it queues the packet for later processing, returns 0
|
| 1714 |
* and calls the @tx_hook of the socket when the tranmission
|
| 1715 |
* takes place.
|
| 1716 |
*/
|
| 1717 |
int
|
| 1718 |
sk_send(sock *s, unsigned len)
|
| 1719 |
{
|
| 1720 |
s->ttx = s->tbuf; |
| 1721 |
s->tpos = s->tbuf + len; |
| 1722 |
return sk_maybe_write(s);
|
| 1723 |
} |
| 1724 |
|
| 1725 |
/**
|
| 1726 |
* sk_send_to - send data to a specific destination
|
| 1727 |
* @s: socket
|
| 1728 |
* @len: number of bytes to send
|
| 1729 |
* @addr: IP address to send the packet to
|
| 1730 |
* @port: port to send the packet to
|
| 1731 |
*
|
| 1732 |
* This is a sk_send() replacement for connection-less packet sockets
|
| 1733 |
* which allows destination of the packet to be chosen dynamically.
|
| 1734 |
* Raw IP sockets should use 0 for @port.
|
| 1735 |
*/
|
| 1736 |
int
|
| 1737 |
sk_send_to(sock *s, unsigned len, ip_addr addr, unsigned port) |
| 1738 |
{
|
| 1739 |
s->daddr = addr; |
| 1740 |
if (port)
|
| 1741 |
s->dport = port; |
| 1742 |
|
| 1743 |
s->ttx = s->tbuf; |
| 1744 |
s->tpos = s->tbuf + len; |
| 1745 |
return sk_maybe_write(s);
|
| 1746 |
} |
| 1747 |
|
| 1748 |
/*
|
| 1749 |
int
|
| 1750 |
sk_send_full(sock *s, unsigned len, struct iface *ifa,
|
| 1751 |
ip_addr saddr, ip_addr daddr, unsigned dport)
|
| 1752 |
{
|
| 1753 |
s->iface = ifa;
|
| 1754 |
s->saddr = saddr;
|
| 1755 |
s->daddr = daddr;
|
| 1756 |
s->dport = dport;
|
| 1757 |
s->ttx = s->tbuf;
|
| 1758 |
s->tpos = s->tbuf + len;
|
| 1759 |
return sk_maybe_write(s);
|
| 1760 |
}
|
| 1761 |
*/
|
| 1762 |
|
| 1763 |
/* sk_read() and sk_write() are called from BFD's event loop */
|
| 1764 |
|
| 1765 |
int
|
| 1766 |
sk_read(sock *s, int revents)
|
| 1767 |
{
|
| 1768 |
switch (s->type)
|
| 1769 |
{
|
| 1770 |
case SK_TCP_PASSIVE:
|
| 1771 |
return sk_passive_connected(s, SK_TCP);
|
| 1772 |
|
| 1773 |
case SK_UNIX_PASSIVE:
|
| 1774 |
return sk_passive_connected(s, SK_UNIX);
|
| 1775 |
|
| 1776 |
case SK_TCP:
|
| 1777 |
case SK_UNIX:
|
| 1778 |
{
|
| 1779 |
int c = read(s->fd, s->rpos, s->rbuf + s->rbsize - s->rpos);
|
| 1780 |
|
| 1781 |
if (c < 0) |
| 1782 |
{
|
| 1783 |
if (errno != EINTR && errno != EAGAIN)
|
| 1784 |
s->err_hook(s, errno); |
| 1785 |
else if (errno == EAGAIN && !(revents & POLLIN)) |
| 1786 |
{
|
| 1787 |
log(L_ERR "Got EAGAIN from read when revents=%x (without POLLIN)", revents);
|
| 1788 |
s->err_hook(s, 0);
|
| 1789 |
} |
| 1790 |
} |
| 1791 |
else if (!c) |
| 1792 |
s->err_hook(s, 0);
|
| 1793 |
else
|
| 1794 |
{
|
| 1795 |
s->rpos += c; |
| 1796 |
if (s->rx_hook(s, s->rpos - s->rbuf))
|
| 1797 |
{
|
| 1798 |
/* We need to be careful since the socket could have been deleted by the hook */
|
| 1799 |
if (current_sock == s)
|
| 1800 |
s->rpos = s->rbuf; |
| 1801 |
} |
| 1802 |
return 1; |
| 1803 |
} |
| 1804 |
return 0; |
| 1805 |
} |
| 1806 |
|
| 1807 |
case SK_MAGIC:
|
| 1808 |
return s->rx_hook(s, 0); |
| 1809 |
|
| 1810 |
default:
|
| 1811 |
{
|
| 1812 |
int e = sk_recvmsg(s);
|
| 1813 |
|
| 1814 |
if (e < 0) |
| 1815 |
{
|
| 1816 |
if (errno != EINTR && errno != EAGAIN)
|
| 1817 |
s->err_hook(s, errno); |
| 1818 |
return 0; |
| 1819 |
} |
| 1820 |
|
| 1821 |
s->rpos = s->rbuf + e; |
| 1822 |
s->rx_hook(s, e); |
| 1823 |
return 1; |
| 1824 |
} |
| 1825 |
} |
| 1826 |
} |
| 1827 |
|
| 1828 |
int
|
| 1829 |
sk_write(sock *s) |
| 1830 |
{
|
| 1831 |
switch (s->type)
|
| 1832 |
{
|
| 1833 |
case SK_TCP_ACTIVE:
|
| 1834 |
{
|
| 1835 |
sockaddr sa; |
| 1836 |
sockaddr_fill(&sa, s->af, s->daddr, s->iface, s->dport); |
| 1837 |
|
| 1838 |
if (connect(s->fd, &sa.sa, SA_LEN(sa)) >= 0 || errno == EISCONN) |
| 1839 |
sk_tcp_connected(s); |
| 1840 |
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS) |
| 1841 |
s->err_hook(s, errno); |
| 1842 |
return 0; |
| 1843 |
} |
| 1844 |
|
| 1845 |
default:
|
| 1846 |
if (s->ttx != s->tpos && sk_maybe_write(s) > 0) |
| 1847 |
{
|
| 1848 |
if (s->tx_hook)
|
| 1849 |
s->tx_hook(s); |
| 1850 |
return 1; |
| 1851 |
} |
| 1852 |
return 0; |
| 1853 |
} |
| 1854 |
} |
| 1855 |
|
| 1856 |
void
|
| 1857 |
sk_dump_all(void)
|
| 1858 |
{
|
| 1859 |
node *n; |
| 1860 |
sock *s; |
| 1861 |
|
| 1862 |
debug("Open sockets:\n");
|
| 1863 |
WALK_LIST(n, sock_list) |
| 1864 |
{
|
| 1865 |
s = SKIP_BACK(sock, n, n); |
| 1866 |
debug("%p ", s);
|
| 1867 |
sk_dump(&s->r); |
| 1868 |
} |
| 1869 |
debug("\n");
|
| 1870 |
} |
| 1871 |
|
| 1872 |
|
| 1873 |
/*
|
| 1874 |
* Internal event log and watchdog
|
| 1875 |
*/
|
| 1876 |
|
| 1877 |
#define EVENT_LOG_LENGTH 32 |
| 1878 |
|
| 1879 |
struct event_log_entry
|
| 1880 |
{
|
| 1881 |
void *hook;
|
| 1882 |
void *data;
|
| 1883 |
btime timestamp; |
| 1884 |
btime duration; |
| 1885 |
}; |
| 1886 |
|
| 1887 |
static struct event_log_entry event_log[EVENT_LOG_LENGTH]; |
| 1888 |
static struct event_log_entry *event_open; |
| 1889 |
static int event_log_pos, event_log_num, watchdog_active; |
| 1890 |
static btime last_time;
|
| 1891 |
static btime loop_time;
|
| 1892 |
|
| 1893 |
static void |
| 1894 |
io_update_time(void)
|
| 1895 |
{
|
| 1896 |
struct timespec ts;
|
| 1897 |
int rv;
|
| 1898 |
|
| 1899 |
if (!clock_monotonic_available)
|
| 1900 |
return;
|
| 1901 |
|
| 1902 |
/*
|
| 1903 |
* This is third time-tracking procedure (after update_times() above and
|
| 1904 |
* times_update() in BFD), dedicated to internal event log and latency
|
| 1905 |
* tracking. Hopefully, we consolidate these sometimes.
|
| 1906 |
*/
|
| 1907 |
|
| 1908 |
rv = clock_gettime(CLOCK_MONOTONIC, &ts); |
| 1909 |
if (rv < 0) |
| 1910 |
die("clock_gettime: %m");
|
| 1911 |
|
| 1912 |
last_time = ((s64) ts.tv_sec S) + (ts.tv_nsec / 1000);
|
| 1913 |
|
| 1914 |
if (event_open)
|
| 1915 |
{
|
| 1916 |
event_open->duration = last_time - event_open->timestamp; |
| 1917 |
|
| 1918 |
if (event_open->duration > config->latency_limit)
|
| 1919 |
log(L_WARN "Event 0x%p 0x%p took %d ms",
|
| 1920 |
event_open->hook, event_open->data, (int) (event_open->duration TO_MS));
|
| 1921 |
|
| 1922 |
event_open = NULL;
|
| 1923 |
} |
| 1924 |
} |
| 1925 |
|
| 1926 |
/**
|
| 1927 |
* io_log_event - mark approaching event into event log
|
| 1928 |
* @hook: event hook address
|
| 1929 |
* @data: event data address
|
| 1930 |
*
|
| 1931 |
* Store info (hook, data, timestamp) about the following internal event into
|
| 1932 |
* a circular event log (@event_log). When latency tracking is enabled, the log
|
| 1933 |
* entry is kept open (in @event_open) so the duration can be filled later.
|
| 1934 |
*/
|
| 1935 |
void
|
| 1936 |
io_log_event(void *hook, void *data) |
| 1937 |
{
|
| 1938 |
if (config->latency_debug)
|
| 1939 |
io_update_time(); |
| 1940 |
|
| 1941 |
struct event_log_entry *en = event_log + event_log_pos;
|
| 1942 |
|
| 1943 |
en->hook = hook; |
| 1944 |
en->data = data; |
| 1945 |
en->timestamp = last_time; |
| 1946 |
en->duration = 0;
|
| 1947 |
|
| 1948 |
event_log_num++; |
| 1949 |
event_log_pos++; |
| 1950 |
event_log_pos %= EVENT_LOG_LENGTH; |
| 1951 |
|
| 1952 |
event_open = config->latency_debug ? en : NULL;
|
| 1953 |
} |
| 1954 |
|
| 1955 |
static inline void |
| 1956 |
io_close_event(void)
|
| 1957 |
{
|
| 1958 |
if (event_open)
|
| 1959 |
io_update_time(); |
| 1960 |
} |
| 1961 |
|
| 1962 |
void
|
| 1963 |
io_log_dump(void)
|
| 1964 |
{
|
| 1965 |
int i;
|
| 1966 |
|
| 1967 |
log(L_DEBUG "Event log:");
|
| 1968 |
for (i = 0; i < EVENT_LOG_LENGTH; i++) |
| 1969 |
{
|
| 1970 |
struct event_log_entry *en = event_log + (event_log_pos + i) % EVENT_LOG_LENGTH;
|
| 1971 |
if (en->hook)
|
| 1972 |
log(L_DEBUG " Event 0x%p 0x%p at %8d for %d ms", en->hook, en->data,
|
| 1973 |
(int) ((last_time - en->timestamp) TO_MS), (int) (en->duration TO_MS)); |
| 1974 |
} |
| 1975 |
} |
| 1976 |
|
| 1977 |
void
|
| 1978 |
watchdog_sigalrm(int sig UNUSED)
|
| 1979 |
{
|
| 1980 |
/* Update last_time and duration, but skip latency check */
|
| 1981 |
config->latency_limit = 0xffffffff;
|
| 1982 |
io_update_time(); |
| 1983 |
|
| 1984 |
/* We want core dump */
|
| 1985 |
abort(); |
| 1986 |
} |
| 1987 |
|
| 1988 |
static inline void |
| 1989 |
watchdog_start1(void)
|
| 1990 |
{
|
| 1991 |
io_update_time(); |
| 1992 |
|
| 1993 |
loop_time = last_time; |
| 1994 |
} |
| 1995 |
|
| 1996 |
static inline void |
| 1997 |
watchdog_start(void)
|
| 1998 |
{
|
| 1999 |
io_update_time(); |
| 2000 |
|
| 2001 |
loop_time = last_time; |
| 2002 |
event_log_num = 0;
|
| 2003 |
|
| 2004 |
if (config->watchdog_timeout)
|
| 2005 |
{
|
| 2006 |
alarm(config->watchdog_timeout); |
| 2007 |
watchdog_active = 1;
|
| 2008 |
} |
| 2009 |
} |
| 2010 |
|
| 2011 |
static inline void |
| 2012 |
watchdog_stop(void)
|
| 2013 |
{
|
| 2014 |
io_update_time(); |
| 2015 |
|
| 2016 |
if (watchdog_active)
|
| 2017 |
{
|
| 2018 |
alarm(0);
|
| 2019 |
watchdog_active = 0;
|
| 2020 |
} |
| 2021 |
|
| 2022 |
btime duration = last_time - loop_time; |
| 2023 |
if (duration > config->watchdog_warning)
|
| 2024 |
log(L_WARN "I/O loop cycle took %d ms for %d events",
|
| 2025 |
(int) (duration TO_MS), event_log_num);
|
| 2026 |
} |
| 2027 |
|
| 2028 |
|
| 2029 |
/*
|
| 2030 |
* Main I/O Loop
|
| 2031 |
*/
|
| 2032 |
|
| 2033 |
volatile int async_config_flag; /* Asynchronous reconfiguration/dump scheduled */ |
| 2034 |
volatile int async_dump_flag; |
| 2035 |
|
| 2036 |
void
|
| 2037 |
io_init(void)
|
| 2038 |
{
|
| 2039 |
init_list(&near_timers); |
| 2040 |
init_list(&far_timers); |
| 2041 |
init_list(&sock_list); |
| 2042 |
init_list(&global_event_list); |
| 2043 |
krt_io_init(); |
| 2044 |
init_times(); |
| 2045 |
update_times(); |
| 2046 |
boot_time = now; |
| 2047 |
srandom((int) now_real);
|
| 2048 |
} |
| 2049 |
|
| 2050 |
static int short_loops = 0; |
| 2051 |
#define SHORT_LOOP_MAX 10 |
| 2052 |
|
| 2053 |
void
|
| 2054 |
io_loop(void)
|
| 2055 |
{
|
| 2056 |
int poll_tout;
|
| 2057 |
time_t tout; |
| 2058 |
int nfds, events, pout;
|
| 2059 |
sock *s; |
| 2060 |
node *n; |
| 2061 |
int fdmax = 256; |
| 2062 |
struct pollfd *pfd = xmalloc(fdmax * sizeof(struct pollfd)); |
| 2063 |
|
| 2064 |
watchdog_start1(); |
| 2065 |
for(;;)
|
| 2066 |
{
|
| 2067 |
events = ev_run_list(&global_event_list); |
| 2068 |
timers:
|
| 2069 |
update_times(); |
| 2070 |
tout = tm_first_shot(); |
| 2071 |
if (tout <= now)
|
| 2072 |
{
|
| 2073 |
tm_shot(); |
| 2074 |
goto timers;
|
| 2075 |
} |
| 2076 |
poll_tout = (events ? 0 : MIN(tout - now, 3)) * 1000; /* Time in milliseconds */ |
| 2077 |
|
| 2078 |
io_close_event(); |
| 2079 |
|
| 2080 |
nfds = 0;
|
| 2081 |
WALK_LIST(n, sock_list) |
| 2082 |
{
|
| 2083 |
pfd[nfds] = (struct pollfd) { .fd = -1 }; /* everything other set to 0 by this */ |
| 2084 |
s = SKIP_BACK(sock, n, n); |
| 2085 |
if (s->rx_hook)
|
| 2086 |
{
|
| 2087 |
pfd[nfds].fd = s->fd; |
| 2088 |
pfd[nfds].events |= POLLIN; |
| 2089 |
} |
| 2090 |
if (s->tx_hook && s->ttx != s->tpos)
|
| 2091 |
{
|
| 2092 |
pfd[nfds].fd = s->fd; |
| 2093 |
pfd[nfds].events |= POLLOUT; |
| 2094 |
} |
| 2095 |
if (pfd[nfds].fd != -1) |
| 2096 |
{
|
| 2097 |
s->index = nfds; |
| 2098 |
nfds++; |
| 2099 |
} |
| 2100 |
else
|
| 2101 |
s->index = -1;
|
| 2102 |
|
| 2103 |
if (nfds >= fdmax)
|
| 2104 |
{
|
| 2105 |
fdmax *= 2;
|
| 2106 |
pfd = xrealloc(pfd, fdmax * sizeof(struct pollfd)); |
| 2107 |
} |
| 2108 |
} |
| 2109 |
|
| 2110 |
/*
|
| 2111 |
* Yes, this is racy. But even if the signal comes before this test
|
| 2112 |
* and entering poll(), it gets caught on the next timer tick.
|
| 2113 |
*/
|
| 2114 |
|
| 2115 |
if (async_config_flag)
|
| 2116 |
{
|
| 2117 |
io_log_event(async_config, NULL);
|
| 2118 |
async_config(); |
| 2119 |
async_config_flag = 0;
|
| 2120 |
continue;
|
| 2121 |
} |
| 2122 |
if (async_dump_flag)
|
| 2123 |
{
|
| 2124 |
io_log_event(async_dump, NULL);
|
| 2125 |
async_dump(); |
| 2126 |
async_dump_flag = 0;
|
| 2127 |
continue;
|
| 2128 |
} |
| 2129 |
if (async_shutdown_flag)
|
| 2130 |
{
|
| 2131 |
io_log_event(async_shutdown, NULL);
|
| 2132 |
async_shutdown(); |
| 2133 |
async_shutdown_flag = 0;
|
| 2134 |
continue;
|
| 2135 |
} |
| 2136 |
|
| 2137 |
/* And finally enter poll() to find active sockets */
|
| 2138 |
watchdog_stop(); |
| 2139 |
pout = poll(pfd, nfds, poll_tout); |
| 2140 |
watchdog_start(); |
| 2141 |
|
| 2142 |
if (pout < 0) |
| 2143 |
{
|
| 2144 |
if (errno == EINTR || errno == EAGAIN)
|
| 2145 |
continue;
|
| 2146 |
die("poll: %m");
|
| 2147 |
} |
| 2148 |
if (pout)
|
| 2149 |
{
|
| 2150 |
/* guaranteed to be non-empty */
|
| 2151 |
current_sock = SKIP_BACK(sock, n, HEAD(sock_list)); |
| 2152 |
|
| 2153 |
while (current_sock)
|
| 2154 |
{
|
| 2155 |
sock *s = current_sock; |
| 2156 |
if (s->index == -1) |
| 2157 |
{
|
| 2158 |
current_sock = sk_next(s); |
| 2159 |
goto next;
|
| 2160 |
} |
| 2161 |
|
| 2162 |
int e;
|
| 2163 |
int steps;
|
| 2164 |
|
| 2165 |
steps = MAX_STEPS; |
| 2166 |
if (s->fast_rx && (pfd[s->index].revents & (POLLIN | POLLHUP | POLLERR)) && s->rx_hook)
|
| 2167 |
do
|
| 2168 |
{
|
| 2169 |
steps--; |
| 2170 |
io_log_event(s->rx_hook, s->data); |
| 2171 |
e = sk_read(s, pfd[s->index].revents); |
| 2172 |
if (s != current_sock)
|
| 2173 |
goto next;
|
| 2174 |
} |
| 2175 |
while (e && s->rx_hook && steps);
|
| 2176 |
|
| 2177 |
steps = MAX_STEPS; |
| 2178 |
if (pfd[s->index].revents & POLLOUT)
|
| 2179 |
do
|
| 2180 |
{
|
| 2181 |
steps--; |
| 2182 |
io_log_event(s->tx_hook, s->data); |
| 2183 |
e = sk_write(s); |
| 2184 |
if (s != current_sock)
|
| 2185 |
goto next;
|
| 2186 |
} |
| 2187 |
while (e && steps);
|
| 2188 |
current_sock = sk_next(s); |
| 2189 |
next: ;
|
| 2190 |
} |
| 2191 |
|
| 2192 |
short_loops++; |
| 2193 |
if (events && (short_loops < SHORT_LOOP_MAX))
|
| 2194 |
continue;
|
| 2195 |
short_loops = 0;
|
| 2196 |
|
| 2197 |
int count = 0; |
| 2198 |
current_sock = stored_sock; |
| 2199 |
if (current_sock == NULL) |
| 2200 |
current_sock = SKIP_BACK(sock, n, HEAD(sock_list)); |
| 2201 |
|
| 2202 |
while (current_sock && count < MAX_RX_STEPS)
|
| 2203 |
{
|
| 2204 |
sock *s = current_sock; |
| 2205 |
if (s->index == -1) |
| 2206 |
{
|
| 2207 |
current_sock = sk_next(s); |
| 2208 |
goto next2;
|
| 2209 |
} |
| 2210 |
|
| 2211 |
if (!s->fast_rx && (pfd[s->index].revents & (POLLIN | POLLHUP | POLLERR)) && s->rx_hook)
|
| 2212 |
{
|
| 2213 |
count++; |
| 2214 |
io_log_event(s->rx_hook, s->data); |
| 2215 |
sk_read(s, pfd[s->index].revents); |
| 2216 |
if (s != current_sock)
|
| 2217 |
goto next2;
|
| 2218 |
} |
| 2219 |
current_sock = sk_next(s); |
| 2220 |
next2: ;
|
| 2221 |
} |
| 2222 |
|
| 2223 |
stored_sock = current_sock; |
| 2224 |
} |
| 2225 |
} |
| 2226 |
} |
| 2227 |
|
| 2228 |
void
|
| 2229 |
test_old_bird(char *path)
|
| 2230 |
{
|
| 2231 |
int fd;
|
| 2232 |
struct sockaddr_un sa;
|
| 2233 |
|
| 2234 |
fd = socket(AF_UNIX, SOCK_STREAM, 0);
|
| 2235 |
if (fd < 0) |
| 2236 |
die("Cannot create socket: %m");
|
| 2237 |
if (strlen(path) >= sizeof(sa.sun_path)) |
| 2238 |
die("Socket path too long");
|
| 2239 |
bzero(&sa, sizeof(sa));
|
| 2240 |
sa.sun_family = AF_UNIX; |
| 2241 |
strcpy(sa.sun_path, path); |
| 2242 |
if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == 0) |
| 2243 |
die("I found another BIRD running.");
|
| 2244 |
close(fd); |
| 2245 |
} |