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bird/sysdep/unix/io.c
Ondrej Zajicek 70e212f913 Implements TTL security for OSPF and RIP. 
Interfaces for OSPF and RIP could be configured to use (and request)
TTL 255 for traffic to direct neighbors.

Thanks to Simon Dickhoven for the original patch for RIPng.
2013-06-25 15:39:44 +02:00

1740 lines
35 KiB
C
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/*
* BIRD Internet Routing Daemon -- Unix I/O
*
* (c) 1998--2004 Martin Mares <mj@ucw.cz>
* (c) 2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/* Unfortunately, some glibc versions hide parts of RFC 3542 API
if _GNU_SOURCE is not defined. */
#define _GNU_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/fcntl.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include "nest/bird.h"
#include "lib/lists.h"
#include "lib/resource.h"
#include "lib/timer.h"
#include "lib/socket.h"
#include "lib/event.h"
#include "lib/string.h"
#include "nest/iface.h"
#include "lib/unix.h"
#include "lib/sysio.h"
/* Maximum number of calls of tx handler for one socket in one
* select iteration. Should be small enough to not monopolize CPU by
* one protocol instance.
*/
#define MAX_STEPS 4
/* Maximum number of calls of rx handler for all sockets in one select
iteration. RX callbacks are often much more costly so we limit
this to gen small latencies */
#define MAX_RX_STEPS 4
/*
* Tracked Files
*/
struct rfile {
resource r;
FILE *f;
};
static void
rf_free(resource *r)
{
struct rfile *a = (struct rfile *) r;
fclose(a->f);
}
static void
rf_dump(resource *r)
{
struct rfile *a = (struct rfile *) r;
debug("(FILE *%p)\n", a->f);
}
static struct resclass rf_class = {
"FILE",
sizeof(struct rfile),
rf_free,
rf_dump,
NULL,
NULL
};
void *
tracked_fopen(pool *p, char *name, char *mode)
{
FILE *f = fopen(name, mode);
if (f)
{
struct rfile *r = ralloc(p, &rf_class);
r->f = f;
}
return f;
}
/**
* DOC: Timers
*
* Timers are resources which represent a wish of a module to call
* a function at the specified time. The platform dependent code
* doesn't guarantee exact timing, only that a timer function
* won't be called before the requested time.
*
* In BIRD, time is represented by values of the &bird_clock_t type
* which are integral numbers interpreted as a relative number of seconds since
* some fixed time point in past. The current time can be read
* from variable @now with reasonable accuracy and is monotonic. There is also
* a current 'absolute' time in variable @now_real reported by OS.
*
* Each timer is described by a &timer structure containing a pointer
* to the handler function (@hook), data private to this function (@data),
* time the function should be called at (@expires, 0 for inactive timers),
* for the other fields see |timer.h|.
*/
#define NEAR_TIMER_LIMIT 4
static list near_timers, far_timers;
static bird_clock_t first_far_timer = TIME_INFINITY;
/* now must be different from 0, because 0 is a special value in timer->expires */
bird_clock_t now = 1, now_real, boot_time;
static void
update_times_plain(void)
{
bird_clock_t new_time = time(NULL);
int delta = new_time - now_real;
if ((delta >= 0) && (delta < 60))
now += delta;
else if (now_real != 0)
log(L_WARN "Time jump, delta %d s", delta);
now_real = new_time;
}
static void
update_times_gettime(void)
{
struct timespec ts;
int rv;
rv = clock_gettime(CLOCK_MONOTONIC, &ts);
if (rv != 0)
die("clock_gettime: %m");
if (ts.tv_sec != now) {
if (ts.tv_sec < now)
log(L_ERR "Monotonic timer is broken");
now = ts.tv_sec;
now_real = time(NULL);
}
}
static int clock_monotonic_available;
static inline void
update_times(void)
{
if (clock_monotonic_available)
update_times_gettime();
else
update_times_plain();
}
static inline void
init_times(void)
{
struct timespec ts;
clock_monotonic_available = (clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
if (!clock_monotonic_available)
log(L_WARN "Monotonic timer is missing");
}
static void
tm_free(resource *r)
{
timer *t = (timer *) r;
tm_stop(t);
}
static void
tm_dump(resource *r)
{
timer *t = (timer *) r;
debug("(code %p, data %p, ", t->hook, t->data);
if (t->randomize)
debug("rand %d, ", t->randomize);
if (t->recurrent)
debug("recur %d, ", t->recurrent);
if (t->expires)
debug("expires in %d sec)\n", t->expires - now);
else
debug("inactive)\n");
}
static struct resclass tm_class = {
"Timer",
sizeof(timer),
tm_free,
tm_dump,
NULL,
NULL
};
/**
* tm_new - create a timer
* @p: pool
*
* This function creates a new timer resource and returns
* a pointer to it. To use the timer, you need to fill in
* the structure fields and call tm_start() to start timing.
*/
timer *
tm_new(pool *p)
{
timer *t = ralloc(p, &tm_class);
return t;
}
static inline void
tm_insert_near(timer *t)
{
node *n = HEAD(near_timers);
while (n->next && (SKIP_BACK(timer, n, n)->expires < t->expires))
n = n->next;
insert_node(&t->n, n->prev);
}
/**
* tm_start - start a timer
* @t: timer
* @after: number of seconds the timer should be run after
*
* This function schedules the hook function of the timer to
* be called after @after seconds. If the timer has been already
* started, it's @expire time is replaced by the new value.
*
* You can have set the @randomize field of @t, the timeout
* will be increased by a random number of seconds chosen
* uniformly from range 0 .. @randomize.
*
* You can call tm_start() from the handler function of the timer
* to request another run of the timer. Also, you can set the @recurrent
* field to have the timer re-added automatically with the same timeout.
*/
void
tm_start(timer *t, unsigned after)
{
bird_clock_t when;
if (t->randomize)
after += random() % (t->randomize + 1);
when = now + after;
if (t->expires == when)
return;
if (t->expires)
rem_node(&t->n);
t->expires = when;
if (after <= NEAR_TIMER_LIMIT)
tm_insert_near(t);
else
{
if (!first_far_timer || first_far_timer > when)
first_far_timer = when;
add_tail(&far_timers, &t->n);
}
}
/**
* tm_stop - stop a timer
* @t: timer
*
* This function stops a timer. If the timer is already stopped,
* nothing happens.
*/
void
tm_stop(timer *t)
{
if (t->expires)
{
rem_node(&t->n);
t->expires = 0;
}
}
static void
tm_dump_them(char *name, list *l)
{
node *n;
timer *t;
debug("%s timers:\n", name);
WALK_LIST(n, *l)
{
t = SKIP_BACK(timer, n, n);
debug("%p ", t);
tm_dump(&t->r);
}
debug("\n");
}
void
tm_dump_all(void)
{
tm_dump_them("Near", &near_timers);
tm_dump_them("Far", &far_timers);
}
static inline time_t
tm_first_shot(void)
{
time_t x = first_far_timer;
if (!EMPTY_LIST(near_timers))
{
timer *t = SKIP_BACK(timer, n, HEAD(near_timers));
if (t->expires < x)
x = t->expires;
}
return x;
}
static void
tm_shot(void)
{
timer *t;
node *n, *m;
if (first_far_timer <= now)
{
bird_clock_t limit = now + NEAR_TIMER_LIMIT;
first_far_timer = TIME_INFINITY;
n = HEAD(far_timers);
while (m = n->next)
{
t = SKIP_BACK(timer, n, n);
if (t->expires <= limit)
{
rem_node(n);
tm_insert_near(t);
}
else if (t->expires < first_far_timer)
first_far_timer = t->expires;
n = m;
}
}
while ((n = HEAD(near_timers)) -> next)
{
int delay;
t = SKIP_BACK(timer, n, n);
if (t->expires > now)
break;
rem_node(n);
delay = t->expires - now;
t->expires = 0;
if (t->recurrent)
{
int i = t->recurrent - delay;
if (i < 0)
i = 0;
tm_start(t, i);
}
t->hook(t);
}
}
/**
* tm_parse_datetime - parse a date and time
* @x: datetime string
*
* tm_parse_datetime() takes a textual representation of
* a date and time (dd-mm-yyyy hh:mm:ss)
* and converts it to the corresponding value of type &bird_clock_t.
*/
bird_clock_t
tm_parse_datetime(char *x)
{
struct tm tm;
int n;
time_t t;
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])
return tm_parse_date(x);
tm.tm_mon--;
tm.tm_year -= 1900;
t = mktime(&tm);
if (t == (time_t) -1)
return 0;
return t;
}
/**
* tm_parse_date - parse a date
* @x: date string
*
* tm_parse_date() takes a textual representation of a date (dd-mm-yyyy)
* and converts it to the corresponding value of type &bird_clock_t.
*/
bird_clock_t
tm_parse_date(char *x)
{
struct tm tm;
int n;
time_t t;
if (sscanf(x, "%d-%d-%d%n", &tm.tm_mday, &tm.tm_mon, &tm.tm_year, &n) != 3 || x[n])
return 0;
tm.tm_mon--;
tm.tm_year -= 1900;
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
t = mktime(&tm);
if (t == (time_t) -1)
return 0;
return t;
}
static void
tm_format_reltime(char *x, struct tm *tm, bird_clock_t delta)
{
static char *month_names[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
if (delta < 20*3600)
bsprintf(x, "%02d:%02d", tm->tm_hour, tm->tm_min);
else if (delta < 360*86400)
bsprintf(x, "%s%02d", month_names[tm->tm_mon], tm->tm_mday);
else
bsprintf(x, "%d", tm->tm_year+1900);
}
#include "conf/conf.h"
/**
* tm_format_datetime - convert date and time to textual representation
* @x: destination buffer of size %TM_DATETIME_BUFFER_SIZE
* @t: time
*
* This function formats the given relative time value @t to a textual
* date/time representation (dd-mm-yyyy hh:mm:ss) in real time.
*/
void
tm_format_datetime(char *x, struct timeformat *fmt_spec, bird_clock_t t)
{
const char *fmt_used;
struct tm *tm;
bird_clock_t delta = now - t;
t = now_real - delta;
tm = localtime(&t);
if (fmt_spec->fmt1 == NULL)
return tm_format_reltime(x, tm, delta);
if ((fmt_spec->limit == 0) || (delta < fmt_spec->limit))
fmt_used = fmt_spec->fmt1;
else
fmt_used = fmt_spec->fmt2;
int rv = strftime(x, TM_DATETIME_BUFFER_SIZE, fmt_used, tm);
if (((rv == 0) && fmt_used[0]) || (rv == TM_DATETIME_BUFFER_SIZE))
strcpy(x, "<too-long>");
}
/**
* DOC: Sockets
*
* Socket resources represent network connections. Their data structure (&socket)
* contains a lot of fields defining the exact type of the socket, the local and
* remote addresses and ports, pointers to socket buffers and finally pointers to
* hook functions to be called when new data have arrived to the receive buffer
* (@rx_hook), when the contents of the transmit buffer have been transmitted
* (@tx_hook) and when an error or connection close occurs (@err_hook).
*
* Freeing of sockets from inside socket hooks is perfectly safe.
*/
#ifndef SOL_IP
#define SOL_IP IPPROTO_IP
#endif
#ifndef SOL_IPV6
#define SOL_IPV6 IPPROTO_IPV6
#endif
static list sock_list;
static struct birdsock *current_sock;
static struct birdsock *stored_sock;
static int sock_recalc_fdsets_p;
static inline sock *
sk_next(sock *s)
{
if (!s->n.next->next)
return NULL;
else
return SKIP_BACK(sock, n, s->n.next);
}
static void
sk_alloc_bufs(sock *s)
{
if (!s->rbuf && s->rbsize)
s->rbuf = s->rbuf_alloc = xmalloc(s->rbsize);
s->rpos = s->rbuf;
if (!s->tbuf && s->tbsize)
s->tbuf = s->tbuf_alloc = xmalloc(s->tbsize);
s->tpos = s->ttx = s->tbuf;
}
static void
sk_free_bufs(sock *s)
{
if (s->rbuf_alloc)
{
xfree(s->rbuf_alloc);
s->rbuf = s->rbuf_alloc = NULL;
}
if (s->tbuf_alloc)
{
xfree(s->tbuf_alloc);
s->tbuf = s->tbuf_alloc = NULL;
}
}
static void
sk_free(resource *r)
{
sock *s = (sock *) r;
sk_free_bufs(s);
if (s->fd >= 0)
{
close(s->fd);
if (s == current_sock)
current_sock = sk_next(s);
if (s == stored_sock)
stored_sock = sk_next(s);
rem_node(&s->n);
sock_recalc_fdsets_p = 1;
}
}
void
sk_reallocate(sock *s)
{
sk_free_bufs(s);
sk_alloc_bufs(s);
}
static void
sk_dump(resource *r)
{
sock *s = (sock *) r;
static char *sk_type_names[] = { "TCP<", "TCP>", "TCP", "UDP", "UDP/MC", "IP", "IP/MC", "MAGIC", "UNIX<", "UNIX", "DEL!" };
debug("(%s, ud=%p, sa=%08x, sp=%d, da=%08x, dp=%d, tos=%d, ttl=%d, if=%s)\n",
sk_type_names[s->type],
s->data,
s->saddr,
s->sport,
s->daddr,
s->dport,
s->tos,
s->ttl,
s->iface ? s->iface->name : "none");
}
static struct resclass sk_class = {
"Socket",
sizeof(sock),
sk_free,
sk_dump,
NULL,
NULL
};
/**
* sk_new - create a socket
* @p: pool
*
* This function creates a new socket resource. If you want to use it,
* you need to fill in all the required fields of the structure and
* call sk_open() to do the actual opening of the socket.
*
* The real function name is sock_new(), sk_new() is a macro wrapper
* to avoid collision with OpenSSL.
*/
sock *
sock_new(pool *p)
{
sock *s = ralloc(p, &sk_class);
s->pool = p;
// s->saddr = s->daddr = IPA_NONE;
s->tos = s->priority = s->ttl = -1;
s->fd = -1;
return s;
}
static void
sk_insert(sock *s)
{
add_tail(&sock_list, &s->n);
sock_recalc_fdsets_p = 1;
}
#ifdef IPV6
void
fill_in_sockaddr(struct sockaddr_in6 *sa, ip_addr a, struct iface *ifa, unsigned port)
{
memset(sa, 0, sizeof (struct sockaddr_in6));
sa->sin6_family = AF_INET6;
sa->sin6_port = htons(port);
sa->sin6_flowinfo = 0;
#ifdef HAVE_SIN_LEN
sa->sin6_len = sizeof(struct sockaddr_in6);
#endif
set_inaddr(&sa->sin6_addr, a);
if (ifa && ipa_has_link_scope(a))
sa->sin6_scope_id = ifa->index;
}
void
get_sockaddr(struct sockaddr_in6 *sa, ip_addr *a, struct iface **ifa, unsigned *port, int check)
{
if (check && sa->sin6_family != AF_INET6)
bug("get_sockaddr called for wrong address family (%d)", sa->sin6_family);
if (port)
*port = ntohs(sa->sin6_port);
memcpy(a, &sa->sin6_addr, sizeof(*a));
ipa_ntoh(*a);
if (ifa && ipa_has_link_scope(*a))
*ifa = if_find_by_index(sa->sin6_scope_id);
}
#else
void
fill_in_sockaddr(struct sockaddr_in *sa, ip_addr a, struct iface *ifa, unsigned port)
{
memset (sa, 0, sizeof (struct sockaddr_in));
sa->sin_family = AF_INET;
sa->sin_port = htons(port);
#ifdef HAVE_SIN_LEN
sa->sin_len = sizeof(struct sockaddr_in);
#endif
set_inaddr(&sa->sin_addr, a);
}
void
get_sockaddr(struct sockaddr_in *sa, ip_addr *a, struct iface **ifa, unsigned *port, int check)
{
if (check && sa->sin_family != AF_INET)
bug("get_sockaddr called for wrong address family (%d)", sa->sin_family);
if (port)
*port = ntohs(sa->sin_port);
memcpy(a, &sa->sin_addr.s_addr, sizeof(*a));
ipa_ntoh(*a);
}
#endif
#ifdef IPV6
/* PKTINFO handling is also standardized in IPv6 */
#define CMSG_RX_SPACE (CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)))
#define CMSG_TX_SPACE CMSG_SPACE(sizeof(struct in6_pktinfo))
/*
* RFC 2292 uses IPV6_PKTINFO for both the socket option and the cmsg
* type, RFC 3542 changed the socket option to IPV6_RECVPKTINFO. If we
* don't have IPV6_RECVPKTINFO we suppose the OS implements the older
* RFC and we use IPV6_PKTINFO.
*/
#ifndef IPV6_RECVPKTINFO
#define IPV6_RECVPKTINFO IPV6_PKTINFO
#endif
/*
* Same goes for IPV6_HOPLIMIT -> IPV6_RECVHOPLIMIT.
*/
#ifndef IPV6_RECVHOPLIMIT
#define IPV6_RECVHOPLIMIT IPV6_HOPLIMIT
#endif
static char *
sysio_register_cmsgs(sock *s)
{
int ok = 1;
if ((s->flags & SKF_LADDR_RX) &&
(setsockopt(s->fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &ok, sizeof(ok)) < 0))
return "IPV6_RECVPKTINFO";
if ((s->flags & SKF_TTL_RX) &&
(setsockopt(s->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &ok, sizeof(ok)) < 0))
return "IPV6_RECVHOPLIMIT";
return NULL;
}
static void
sysio_process_rx_cmsgs(sock *s, struct msghdr *msg)
{
struct cmsghdr *cm;
struct in6_pktinfo *pi = NULL;
int *hlim = NULL;
for (cm = CMSG_FIRSTHDR(msg); cm != NULL; cm = CMSG_NXTHDR(msg, cm))
{
if (cm->cmsg_level == IPPROTO_IPV6 && cm->cmsg_type == IPV6_PKTINFO)
pi = (struct in6_pktinfo *) CMSG_DATA(cm);
if (cm->cmsg_level == IPPROTO_IPV6 && cm->cmsg_type == IPV6_HOPLIMIT)
hlim = (int *) CMSG_DATA(cm);
}
if (s->flags & SKF_LADDR_RX)
{
if (pi)
{
get_inaddr(&s->laddr, &pi->ipi6_addr);
s->lifindex = pi->ipi6_ifindex;
}
else
{
s->laddr = IPA_NONE;
s->lifindex = 0;
}
}
if (s->flags & SKF_TTL_RX)
s->ttl = hlim ? *hlim : -1;
return;
}
/*
static void
sysio_prepare_tx_cmsgs(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
{
struct cmsghdr *cm;
struct in6_pktinfo *pi;
if (!(s->flags & SKF_LADDR_TX))
return;
msg->msg_control = cbuf;
msg->msg_controllen = cbuflen;
cm = CMSG_FIRSTHDR(msg);
cm->cmsg_level = IPPROTO_IPV6;
cm->cmsg_type = IPV6_PKTINFO;
cm->cmsg_len = CMSG_LEN(sizeof(*pi));
pi = (struct in6_pktinfo *) CMSG_DATA(cm);
set_inaddr(&pi->ipi6_addr, s->saddr);
pi->ipi6_ifindex = s->iface ? s->iface->index : 0;
msg->msg_controllen = cm->cmsg_len;
return;
}
*/
#endif
static char *
sk_set_ttl_int(sock *s)
{
#ifdef IPV6
if (setsockopt(s->fd, SOL_IPV6, IPV6_UNICAST_HOPS, &s->ttl, sizeof(s->ttl)) < 0)
return "IPV6_UNICAST_HOPS";
#else
if (setsockopt(s->fd, SOL_IP, IP_TTL, &s->ttl, sizeof(s->ttl)) < 0)
return "IP_TTL";
#ifdef CONFIG_UNIX_DONTROUTE
int one = 1;
if (s->ttl == 1 && setsockopt(s->fd, SOL_SOCKET, SO_DONTROUTE, &one, sizeof(one)) < 0)
return "SO_DONTROUTE";
#endif
#endif
return NULL;
}
#define ERR(x) do { err = x; goto bad; } while(0)
#define WARN(x) log(L_WARN "sk_setup: %s: %m", x)
static char *
sk_setup(sock *s)
{
int fd = s->fd;
char *err = NULL;
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
ERR("fcntl(O_NONBLOCK)");
if (s->type == SK_UNIX)
return NULL;
#ifdef IPV6
if ((s->tos >= 0) && setsockopt(fd, SOL_IPV6, IPV6_TCLASS, &s->tos, sizeof(s->tos)) < 0)
WARN("IPV6_TCLASS");
#else
if ((s->tos >= 0) && setsockopt(fd, SOL_IP, IP_TOS, &s->tos, sizeof(s->tos)) < 0)
WARN("IP_TOS");
#endif
if (s->priority >= 0)
sk_set_priority(s, s->priority);
#ifdef IPV6
int v = 1;
if ((s->flags & SKF_V6ONLY) && setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &v, sizeof(v)) < 0)
WARN("IPV6_V6ONLY");
#endif
if (s->ttl >= 0)
err = sk_set_ttl_int(s);
sysio_register_cmsgs(s);
bad:
return err;
}
/**
* sk_set_ttl - set transmit TTL for given socket.
* @s: socket
* @ttl: TTL value
*
* Set TTL for already opened connections when TTL was not set before.
* Useful for accepted connections when different ones should have
* different TTL.
*
* Result: 0 for success, -1 for an error.
*/
int
sk_set_ttl(sock *s, int ttl)
{
char *err;
s->ttl = ttl;
if (err = sk_set_ttl_int(s))
log(L_ERR "sk_set_ttl: %s: %m", err);
return (err ? -1 : 0);
}
/**
* sk_set_min_ttl - set minimal accepted TTL for given socket.
* @s: socket
* @ttl: TTL value
*
* Can be used in TTL security implementation
*
* Result: 0 for success, -1 for an error.
*/
int
sk_set_min_ttl(sock *s, int ttl)
{
int err;
#ifdef IPV6
err = sk_set_min_ttl6(s, ttl);
#else
err = sk_set_min_ttl4(s, ttl);
#endif
return err;
}
/**
* sk_set_md5_auth - add / remove MD5 security association for given socket.
* @s: socket
* @a: IP address of the other side
* @ifa: Interface for link-local IP address
* @passwd: password used for MD5 authentication
*
* In TCP MD5 handling code in kernel, there is a set of pairs
* (address, password) used to choose password according to
* address of the other side. This function is useful for
* listening socket, for active sockets it is enough to set
* s->password field.
*
* When called with passwd != NULL, the new pair is added,
* When called with passwd == NULL, the existing pair is removed.
*
* Result: 0 for success, -1 for an error.
*/
int
sk_set_md5_auth(sock *s, ip_addr a, struct iface *ifa, char *passwd)
{
sockaddr sa;
fill_in_sockaddr(&sa, a, ifa, 0);
return sk_set_md5_auth_int(s, &sa, passwd);
}
int
sk_set_broadcast(sock *s, int enable)
{
if (setsockopt(s->fd, SOL_SOCKET, SO_BROADCAST, &enable, sizeof(enable)) < 0)
{
log(L_ERR "sk_set_broadcast: SO_BROADCAST: %m");
return -1;
}
return 0;
}
#ifdef IPV6
int
sk_set_ipv6_checksum(sock *s, int offset)
{
if (setsockopt(s->fd, IPPROTO_IPV6, IPV6_CHECKSUM, &offset, sizeof(offset)) < 0)
{
log(L_ERR "sk_set_ipv6_checksum: IPV6_CHECKSUM: %m");
return -1;
}
return 0;
}
int
sk_set_icmp_filter(sock *s, int p1, int p2)
{
/* a bit of lame interface, but it is here only for Radv */
struct icmp6_filter f;
ICMP6_FILTER_SETBLOCKALL(&f);
ICMP6_FILTER_SETPASS(p1, &f);
ICMP6_FILTER_SETPASS(p2, &f);
if (setsockopt(s->fd, IPPROTO_ICMPV6, ICMP6_FILTER, &f, sizeof(f)) < 0)
{
log(L_ERR "sk_setup_icmp_filter: ICMP6_FILTER: %m");
return -1;
}
return 0;
}
int
sk_setup_multicast(sock *s)
{
char *err;
int zero = 0;
int index;
ASSERT(s->iface && s->iface->addr);
index = s->iface->index;
if (setsockopt(s->fd, SOL_IPV6, IPV6_MULTICAST_HOPS, &s->ttl, sizeof(s->ttl)) < 0)
ERR("IPV6_MULTICAST_HOPS");
if (setsockopt(s->fd, SOL_IPV6, IPV6_MULTICAST_LOOP, &zero, sizeof(zero)) < 0)
ERR("IPV6_MULTICAST_LOOP");
if (setsockopt(s->fd, SOL_IPV6, IPV6_MULTICAST_IF, &index, sizeof(index)) < 0)
ERR("IPV6_MULTICAST_IF");
if (err = sysio_bind_to_iface(s))
goto bad;
return 0;
bad:
log(L_ERR "sk_setup_multicast: %s: %m", err);
return -1;
}
int
sk_join_group(sock *s, ip_addr maddr)
{
struct ipv6_mreq mreq;
set_inaddr(&mreq.ipv6mr_multiaddr, maddr);
#ifdef CONFIG_IPV6_GLIBC_20
mreq.ipv6mr_ifindex = s->iface->index;
#else
mreq.ipv6mr_interface = s->iface->index;
#endif
if (setsockopt(s->fd, SOL_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) < 0)
{
log(L_ERR "sk_join_group: IPV6_JOIN_GROUP: %m");
return -1;
}
return 0;
}
int
sk_leave_group(sock *s, ip_addr maddr)
{
struct ipv6_mreq mreq;
set_inaddr(&mreq.ipv6mr_multiaddr, maddr);
#ifdef CONFIG_IPV6_GLIBC_20
mreq.ipv6mr_ifindex = s->iface->index;
#else
mreq.ipv6mr_interface = s->iface->index;
#endif
if (setsockopt(s->fd, SOL_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq)) < 0)
{
log(L_ERR "sk_leave_group: IPV6_LEAVE_GROUP: %m");
return -1;
}
return 0;
}
#else /* IPV4 */
int
sk_setup_multicast(sock *s)
{
char *err;
ASSERT(s->iface && s->iface->addr);
if (err = sysio_setup_multicast(s))
{
log(L_ERR "sk_setup_multicast: %s: %m", err);
return -1;
}
return 0;
}
int
sk_join_group(sock *s, ip_addr maddr)
{
char *err;
if (err = sysio_join_group(s, maddr))
{
log(L_ERR "sk_join_group: %s: %m", err);
return -1;
}
return 0;
}
int
sk_leave_group(sock *s, ip_addr maddr)
{
char *err;
if (err = sysio_leave_group(s, maddr))
{
log(L_ERR "sk_leave_group: %s: %m", err);
return -1;
}
return 0;
}
#endif
static void
sk_tcp_connected(sock *s)
{
sockaddr lsa;
int lsa_len = sizeof(lsa);
if (getsockname(s->fd, (struct sockaddr *) &lsa, &lsa_len) == 0)
get_sockaddr(&lsa, &s->saddr, &s->iface, &s->sport, 1);
s->type = SK_TCP;
sk_alloc_bufs(s);
s->tx_hook(s);
}
static int
sk_passive_connected(sock *s, struct sockaddr *sa, int al, int type)
{
int fd = accept(s->fd, sa, &al);
if (fd >= 0)
{
sock *t = sk_new(s->pool);
char *err;
t->type = type;
t->fd = fd;
t->ttl = s->ttl;
t->tos = s->tos;
t->rbsize = s->rbsize;
t->tbsize = s->tbsize;
if (type == SK_TCP)
{
sockaddr lsa;
int lsa_len = sizeof(lsa);
if (getsockname(fd, (struct sockaddr *) &lsa, &lsa_len) == 0)
get_sockaddr(&lsa, &t->saddr, &t->iface, &t->sport, 1);
get_sockaddr((sockaddr *) sa, &t->daddr, &t->iface, &t->dport, 1);
}
sk_insert(t);
if (err = sk_setup(t))
{
log(L_ERR "Incoming connection: %s: %m", err);
rfree(t);
return 1;
}
sk_alloc_bufs(t);
s->rx_hook(t, 0);
return 1;
}
else if (errno != EINTR && errno != EAGAIN)
{
s->err_hook(s, errno);
}
return 0;
}
/**
* sk_open - open a socket
* @s: socket
*
* This function takes a socket resource created by sk_new() and
* initialized by the user and binds a corresponding network connection
* to it.
*
* Result: 0 for success, -1 for an error.
*/
int
sk_open(sock *s)
{
int fd;
sockaddr sa;
int one = 1;
int type = s->type;
int has_src = ipa_nonzero(s->saddr) || s->sport;
char *err;
switch (type)
{
case SK_TCP_ACTIVE:
s->ttx = ""; /* Force s->ttx != s->tpos */
/* Fall thru */
case SK_TCP_PASSIVE:
fd = socket(BIRD_PF, SOCK_STREAM, IPPROTO_TCP);
break;
case SK_UDP:
fd = socket(BIRD_PF, SOCK_DGRAM, IPPROTO_UDP);
break;
case SK_IP:
fd = socket(BIRD_PF, SOCK_RAW, s->dport);
break;
case SK_MAGIC:
fd = s->fd;
break;
default:
bug("sk_open() called for invalid sock type %d", type);
}
if (fd < 0)
die("sk_open: socket: %m");
s->fd = fd;
if (err = sk_setup(s))
goto bad;
if (has_src)
{
int port;
if (type == SK_IP)
port = 0;
else
{
port = s->sport;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
ERR("SO_REUSEADDR");
}
fill_in_sockaddr(&sa, s->saddr, s->iface, port);
if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0)
ERR("bind");
}
fill_in_sockaddr(&sa, s->daddr, s->iface, s->dport);
if (s->password)
{
int rv = sk_set_md5_auth_int(s, &sa, s->password);
if (rv < 0)
goto bad_no_log;
}
switch (type)
{
case SK_TCP_ACTIVE:
if (connect(fd, (struct sockaddr *) &sa, sizeof(sa)) >= 0)
sk_tcp_connected(s);
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS &&
errno != ECONNREFUSED && errno != EHOSTUNREACH && errno != ENETUNREACH)
ERR("connect");
break;
case SK_TCP_PASSIVE:
if (listen(fd, 8))
ERR("listen");
break;
case SK_MAGIC:
break;
default:
sk_alloc_bufs(s);
#ifdef IPV6
#ifdef IPV6_MTU_DISCOVER
{
int dont = IPV6_PMTUDISC_DONT;
if (setsockopt(fd, SOL_IPV6, IPV6_MTU_DISCOVER, &dont, sizeof(dont)) < 0)
ERR("IPV6_MTU_DISCOVER");
}
#endif
#else
#ifdef IP_PMTUDISC
{
int dont = IP_PMTUDISC_DONT;
if (setsockopt(fd, SOL_IP, IP_PMTUDISC, &dont, sizeof(dont)) < 0)
ERR("IP_PMTUDISC");
}
#endif
#endif
}
sk_insert(s);
return 0;
bad:
log(L_ERR "sk_open: %s: %m", err);
bad_no_log:
close(fd);
s->fd = -1;
return -1;
}
void
sk_open_unix(sock *s, char *name)
{
int fd;
struct sockaddr_un sa;
char *err;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
ERR("socket");
s->fd = fd;
if (err = sk_setup(s))
goto bad;
unlink(name);
/* Path length checked in test_old_bird() */
sa.sun_family = AF_UNIX;
strcpy(sa.sun_path, name);
if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) < 0)
ERR("bind");
if (listen(fd, 8))
ERR("listen");
sk_insert(s);
return;
bad:
log(L_ERR "sk_open_unix: %s: %m", err);
die("Unable to create control socket %s", name);
}
static inline void reset_tx_buffer(sock *s) { s->ttx = s->tpos = s->tbuf; }
static int
sk_maybe_write(sock *s)
{
int e;
switch (s->type)
{
case SK_TCP:
case SK_MAGIC:
case SK_UNIX:
while (s->ttx != s->tpos)
{
e = write(s->fd, s->ttx, s->tpos - s->ttx);
if (e < 0)
{
if (errno != EINTR && errno != EAGAIN)
{
reset_tx_buffer(s);
/* EPIPE is just a connection close notification during TX */
s->err_hook(s, (errno != EPIPE) ? errno : 0);
return -1;
}
return 0;
}
s->ttx += e;
}
reset_tx_buffer(s);
return 1;
case SK_UDP:
case SK_IP:
{
if (s->tbuf == s->tpos)
return 1;
sockaddr sa;
fill_in_sockaddr(&sa, s->daddr, s->iface, s->dport);
struct iovec iov = {s->tbuf, s->tpos - s->tbuf};
// byte cmsg_buf[CMSG_TX_SPACE];
struct msghdr msg = {
.msg_name = &sa,
.msg_namelen = sizeof(sa),
.msg_iov = &iov,
.msg_iovlen = 1};
// sysio_prepare_tx_cmsgs(s, &msg, cmsg_buf, sizeof(cmsg_buf));
e = sendmsg(s->fd, &msg, 0);
if (e < 0)
{
if (errno != EINTR && errno != EAGAIN)
{
reset_tx_buffer(s);
s->err_hook(s, errno);
return -1;
}
return 0;
}
reset_tx_buffer(s);
return 1;
}
default:
bug("sk_maybe_write: unknown socket type %d", s->type);
}
}
int
sk_rx_ready(sock *s)
{
fd_set rd, wr;
struct timeval timo;
int rv;
FD_ZERO(&rd);
FD_ZERO(&wr);
FD_SET(s->fd, &rd);
timo.tv_sec = 0;
timo.tv_usec = 0;
redo:
rv = select(s->fd+1, &rd, &wr, NULL, &timo);
if ((rv < 0) && (errno == EINTR || errno == EAGAIN))
goto redo;
return rv;
}
/**
* sk_send - send data to a socket
* @s: socket
* @len: number of bytes to send
*
* This function sends @len bytes of data prepared in the
* transmit buffer of the socket @s to the network connection.
* If the packet can be sent immediately, it does so and returns
* 1, else it queues the packet for later processing, returns 0
* and calls the @tx_hook of the socket when the tranmission
* takes place.
*/
int
sk_send(sock *s, unsigned len)
{
s->ttx = s->tbuf;
s->tpos = s->tbuf + len;
return sk_maybe_write(s);
}
/**
* sk_send_to - send data to a specific destination
* @s: socket
* @len: number of bytes to send
* @addr: IP address to send the packet to
* @port: port to send the packet to
*
* This is a sk_send() replacement for connection-less packet sockets
* which allows destination of the packet to be chosen dynamically.
*/
int
sk_send_to(sock *s, unsigned len, ip_addr addr, unsigned port)
{
s->daddr = addr;
s->dport = port;
s->ttx = s->tbuf;
s->tpos = s->tbuf + len;
return sk_maybe_write(s);
}
/*
int
sk_send_full(sock *s, unsigned len, struct iface *ifa,
ip_addr saddr, ip_addr daddr, unsigned dport)
{
s->iface = ifa;
s->saddr = saddr;
s->daddr = daddr;
s->dport = dport;
s->ttx = s->tbuf;
s->tpos = s->tbuf + len;
return sk_maybe_write(s);
}
*/
static int
sk_read(sock *s)
{
switch (s->type)
{
case SK_TCP_PASSIVE:
{
sockaddr sa;
return sk_passive_connected(s, (struct sockaddr *) &sa, sizeof(sa), SK_TCP);
}
case SK_UNIX_PASSIVE:
{
struct sockaddr_un sa;
return sk_passive_connected(s, (struct sockaddr *) &sa, sizeof(sa), SK_UNIX);
}
case SK_TCP:
case SK_UNIX:
{
int c = read(s->fd, s->rpos, s->rbuf + s->rbsize - s->rpos);
if (c < 0)
{
if (errno != EINTR && errno != EAGAIN)
s->err_hook(s, errno);
}
else if (!c)
s->err_hook(s, 0);
else
{
s->rpos += c;
if (s->rx_hook(s, s->rpos - s->rbuf))
{
/* We need to be careful since the socket could have been deleted by the hook */
if (current_sock == s)
s->rpos = s->rbuf;
}
return 1;
}
return 0;
}
case SK_MAGIC:
return s->rx_hook(s, 0);
default:
{
sockaddr sa;
int e;
struct iovec iov = {s->rbuf, s->rbsize};
byte cmsg_buf[CMSG_RX_SPACE];
struct msghdr msg = {
.msg_name = &sa,
.msg_namelen = sizeof(sa),
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsg_buf,
.msg_controllen = sizeof(cmsg_buf),
.msg_flags = 0};
e = recvmsg(s->fd, &msg, 0);
if (e < 0)
{
if (errno != EINTR && errno != EAGAIN)
s->err_hook(s, errno);
return 0;
}
s->rpos = s->rbuf + e;
get_sockaddr(&sa, &s->faddr, NULL, &s->fport, 1);
sysio_process_rx_cmsgs(s, &msg);
s->rx_hook(s, e);
return 1;
}
}
}
static int
sk_write(sock *s)
{
switch (s->type)
{
case SK_TCP_ACTIVE:
{
sockaddr sa;
fill_in_sockaddr(&sa, s->daddr, s->iface, s->dport);
if (connect(s->fd, (struct sockaddr *) &sa, sizeof(sa)) >= 0 || errno == EISCONN)
sk_tcp_connected(s);
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS)
s->err_hook(s, errno);
return 0;
}
default:
if (s->ttx != s->tpos && sk_maybe_write(s) > 0)
{
s->tx_hook(s);
return 1;
}
return 0;
}
}
void
sk_dump_all(void)
{
node *n;
sock *s;
debug("Open sockets:\n");
WALK_LIST(n, sock_list)
{
s = SKIP_BACK(sock, n, n);
debug("%p ", s);
sk_dump(&s->r);
}
debug("\n");
}
#undef ERR
#undef WARN
/*
* Main I/O Loop
*/
volatile int async_config_flag; /* Asynchronous reconfiguration/dump scheduled */
volatile int async_dump_flag;
void
io_init(void)
{
init_list(&near_timers);
init_list(&far_timers);
init_list(&sock_list);
init_list(&global_event_list);
krt_io_init();
init_times();
update_times();
boot_time = now;
srandom((int) now_real);
}
static int short_loops = 0;
#define SHORT_LOOP_MAX 10
void
io_loop(void)
{
fd_set rd, wr;
struct timeval timo;
time_t tout;
int hi, events;
sock *s;
node *n;
sock_recalc_fdsets_p = 1;
for(;;)
{
events = ev_run_list(&global_event_list);
update_times();
tout = tm_first_shot();
if (tout <= now)
{
tm_shot();
continue;
}
timo.tv_sec = events ? 0 : MIN(tout - now, 3);
timo.tv_usec = 0;
if (sock_recalc_fdsets_p)
{
sock_recalc_fdsets_p = 0;
FD_ZERO(&rd);
FD_ZERO(&wr);
}
hi = 0;
WALK_LIST(n, sock_list)
{
s = SKIP_BACK(sock, n, n);
if (s->rx_hook)
{
FD_SET(s->fd, &rd);
if (s->fd > hi)
hi = s->fd;
}
else
FD_CLR(s->fd, &rd);
if (s->tx_hook && s->ttx != s->tpos)
{
FD_SET(s->fd, &wr);
if (s->fd > hi)
hi = s->fd;
}
else
FD_CLR(s->fd, &wr);
}
/*
* Yes, this is racy. But even if the signal comes before this test
* and entering select(), it gets caught on the next timer tick.
*/
if (async_config_flag)
{
async_config();
async_config_flag = 0;
continue;
}
if (async_dump_flag)
{
async_dump();
async_dump_flag = 0;
continue;
}
if (async_shutdown_flag)
{
async_shutdown();
async_shutdown_flag = 0;
continue;
}
/* And finally enter select() to find active sockets */
hi = select(hi+1, &rd, &wr, NULL, &timo);
if (hi < 0)
{
if (errno == EINTR || errno == EAGAIN)
continue;
die("select: %m");
}
if (hi)
{
/* guaranteed to be non-empty */
current_sock = SKIP_BACK(sock, n, HEAD(sock_list));
while (current_sock)
{
sock *s = current_sock;
int e;
int steps;
steps = MAX_STEPS;
if ((s->type >= SK_MAGIC) && FD_ISSET(s->fd, &rd) && s->rx_hook)
do
{
steps--;
e = sk_read(s);
if (s != current_sock)
goto next;
}
while (e && s->rx_hook && steps);
steps = MAX_STEPS;
if (FD_ISSET(s->fd, &wr))
do
{
steps--;
e = sk_write(s);
if (s != current_sock)
goto next;
}
while (e && steps);
current_sock = sk_next(s);
next: ;
}
short_loops++;
if (events && (short_loops < SHORT_LOOP_MAX))
continue;
short_loops = 0;
int count = 0;
current_sock = stored_sock;
if (current_sock == NULL)
current_sock = SKIP_BACK(sock, n, HEAD(sock_list));
while (current_sock && count < MAX_RX_STEPS)
{
sock *s = current_sock;
int e;
if ((s->type < SK_MAGIC) && FD_ISSET(s->fd, &rd) && s->rx_hook)
{
count++;
e = sk_read(s);
if (s != current_sock)
goto next2;
}
current_sock = sk_next(s);
next2: ;
}
stored_sock = current_sock;
}
}
}
void
test_old_bird(char *path)
{
int fd;
struct sockaddr_un sa;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
die("Cannot create socket: %m");
if (strlen(path) >= sizeof(sa.sun_path))
die("Socket path too long");
bzero(&sa, sizeof(sa));
sa.sun_family = AF_UNIX;
strcpy(sa.sun_path, path);
if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == 0)
die("I found another BIRD running.");
close(fd);
}
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