diff options
| -rw-r--r-- | ChangeLog | 26 | ||||
| -rw-r--r-- | include/ifaddrs.h | 5 | ||||
| -rw-r--r-- | inet/check_pf.c | 18 | ||||
| -rw-r--r-- | nscd/connections.c | 118 | ||||
| -rw-r--r-- | nscd/nscd-client.h | 18 | ||||
| -rw-r--r-- | nscd/nscd_gethst_r.c | 23 | ||||
| -rw-r--r-- | nscd/nscd_helper.c | 10 | ||||
| -rw-r--r-- | sysdeps/posix/getaddrinfo.c | 10 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/Makefile | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/check_pf.c | 175 |
10 files changed, 359 insertions, 46 deletions
diff --git a/ChangeLog b/ChangeLog index b4e65a847c..005a1b7ff5 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,29 @@ +2011-10-31 Ulrich Drepper <drepper@gmail.com> + + * include/ifaddrs.h: Declare __free_in6ai and __bump_nl_timestamp. + * inet/check_pf.c: Provide dummy versions of __free_in6ai and + __bump_nl_timestamp. + * nscd/connections (nscd_init): When host database is served open + netlink socket and request notification about configuration changes. + (main_loop_poll): Track netlink file descriptor and bump timestamp + in case data becomes available. + (main_loop_epoll): Likewise. + * nscd/nscd-client.h (DB_VERSION): Bump to 2. + (database_pers_head): Add extra_data fileds. + Declare __nscd_get_mapping and __nscd_get_nl_timestamp. + * nscd/nscd_gethst_r.c (__nscd_get_nl_timestamp): New function. + * nscd/nscd_helper.c (__nscd_get_mapping): Renamed from get_mapping. + Adjust caller. + * sysdeps/posix/getaddrinfo.c (getaddrinfo): Don't call free on + in6ai data, call __free_in6ai. + * sysdeps/unix/sysv/linux/Makefile [subdir=nscd] (sysdep-CFLAGS): + Add -DHAVE_NETLINK. + * sysdeps/unix/sysv/linux/check_pf.c: Major rewrite. Cache the + interface information. Reuse previous data if netlink timestamp + is not changed. + (__bump_nl_timestamp): New function. + (__free_in6ai): New function. + 2011-10-30 Ulrich Drepper <drepper@gmail.com> * sysdeps/unix/sysv/linux/check_pf.c (make_request): Don't call diff --git a/include/ifaddrs.h b/include/ifaddrs.h index 50e4c48e82..e1c6cac114 100644 --- a/include/ifaddrs.h +++ b/include/ifaddrs.h @@ -21,8 +21,13 @@ struct in6addrinfo extern void __check_pf (bool *seen_ipv4, bool *seen_ipv6, struct in6addrinfo **in6ai, size_t *in6ailen) attribute_hidden; +extern void __free_in6ai (struct in6addrinfo *in6ai) attribute_hidden; extern void __check_native (uint32_t a1_index, int *a1_native, uint32_t a2_index, int *a2_native) attribute_hidden; +#ifdef IS_IN_nscd +extern uint32_t __bump_nl_timestamp (void) attribute_hidden; +#endif + #endif /* ifaddrs.h */ diff --git a/inet/check_pf.c b/inet/check_pf.c index b015432659..0fa34ccbbd 100644 --- a/inet/check_pf.c +++ b/inet/check_pf.c @@ -1,5 +1,5 @@ /* Determine protocol families for which interfaces exist. Generic version. - Copyright (C) 2003, 2006 Free Software Foundation, Inc. + Copyright (C) 2003, 2006, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -54,3 +54,19 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6, (void) freeifaddrs (ifa); } + + +void +__free_in6ai (struct in6addrinfo *in6ai) +{ + /* Nothing to do. */ +} + + +#ifdef IS_IN_nscd +uint32_t +__bump_nl_timestamp (void) +{ + return 0; +} +#endif diff --git a/nscd/connections.c b/nscd/connections.c index 2b5c7ef53c..1b8a9bdba7 100644 --- a/nscd/connections.c +++ b/nscd/connections.c @@ -24,6 +24,7 @@ #include <errno.h> #include <fcntl.h> #include <grp.h> +#include <ifaddrs.h> #include <libintl.h> #include <pthread.h> #include <pwd.h> @@ -32,6 +33,9 @@ #include <stdlib.h> #include <unistd.h> #include <arpa/inet.h> +#ifdef HAVE_NETLINK +# include <netlink/netlink.h> +#endif #ifdef HAVE_EPOLL # include <sys/epoll.h> #endif @@ -247,6 +251,11 @@ static int sock; int inotify_fd = -1; #endif +#ifdef HAVE_NETLINK +/* Descriptor for netlink status updates. */ +static int nl_status_fd = -1; +#endif + #ifndef __ASSUME_SOCK_CLOEXEC /* Negative if SOCK_CLOEXEC is not supported, positive if it is, zero before be know the result. */ @@ -903,6 +912,65 @@ cannot set socket to close on exec: %s; disabling paranoia mode"), exit (1); } +#ifdef HAVE_NETLINK + if (dbs[hstdb].enabled) + { + /* Try to open netlink socket to monitor network setting changes. */ + nl_status_fd = socket (AF_NETLINK, + SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, + NETLINK_ROUTE); + if (nl_status_fd != -1) + { + struct sockaddr_nl snl; + memset (&snl, '\0', sizeof (snl)); + snl.nl_family = AF_NETLINK; + /* XXX Is this the best set to use? */ + snl.nl_groups = (RTMGRP_IPV4_IFADDR | RTMGRP_TC | RTMGRP_IPV4_MROUTE + | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_RULE + | RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_MROUTE + | RTMGRP_IPV6_ROUTE | RTMGRP_IPV6_IFINFO + | RTMGRP_IPV6_PREFIX); + + if (bind (nl_status_fd, (struct sockaddr *) &snl, sizeof (snl)) != 0) + { + close (nl_status_fd); + nl_status_fd = -1; + } + else + { + /* Start the timestamp process. */ + dbs[hstdb].head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP] + = __bump_nl_timestamp (); + +# ifndef __ASSUME_SOCK_CLOEXEC + if (have_sock_cloexec < 0) + { + /* We don't want to get stuck on accept. */ + int fl = fcntl (nl_status_fd, F_GETFL); + if (fl == -1 + || fcntl (nl_status_fd, F_SETFL, fl | O_NONBLOCK) == -1) + { + dbg_log (_("\ +cannot change socket to nonblocking mode: %s"), + strerror (errno)); + exit (1); + } + + /* The descriptor needs to be closed on exec. */ + if (paranoia + && fcntl (nl_status_fd, F_SETFD, FD_CLOEXEC) == -1) + { + dbg_log (_("cannot set socket to close on exec: %s"), + strerror (errno)); + exit (1); + } + } +# endif + } + } + } +#endif + /* Change to unprivileged uid/gid/groups if specified in config file */ if (server_user != NULL) finish_drop_privileges (); @@ -1826,6 +1894,18 @@ main_loop_poll (void) } #endif +#ifdef HAVE_NETLINK + size_t idx_nl_status_fd = 0; + if (nl_status_fd != -1) + { + idx_nl_status_fd = nused; + conns[nused].fd = nl_status_fd; + conns[nused].events = POLLRDNORM; + ++nused; + firstfree = nused; + } +#endif + while (1) { /* Wait for any event. We wait at most a couple of seconds so @@ -1968,6 +2048,20 @@ disabled inotify after read error %d"), } #endif +#ifdef HAVE_NETLINK + if (idx_nl_status_fd != 0 && conns[idx_nl_status_fd].revents != 0) + { + char buf[4096]; + /* Read all the data. We do not interpret it here. */ + while (TEMP_FAILURE_RETRY (read (nl_status_fd, buf, + sizeof (buf))) != -1) + ; + + dbs[hstdb].head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP] + = __bump_nl_timestamp (); + } +#endif + for (size_t cnt = first; cnt < nused && n > 0; ++cnt) if (conns[cnt].revents != 0) { @@ -2046,6 +2140,17 @@ main_loop_epoll (int efd) } # endif +# ifdef HAVE_NETLINK + if (nl_status_fd != -1) + { + ev.events = EPOLLRDNORM; + ev.data.fd = nl_status_fd; + if (epoll_ctl (efd, EPOLL_CTL_ADD, nl_status_fd, &ev) == -1) + /* We cannot use epoll. */ + return; + } +# endif + while (1) { struct epoll_event revs[100]; @@ -2162,6 +2267,18 @@ main_loop_epoll (int efd) } } # endif +# ifdef HAVE_NETLINK + else if (revs[cnt].data.fd == nl_status_fd) + { + char buf[4096]; + /* Read all the data. We do not interpret it here. */ + while (TEMP_FAILURE_RETRY (read (nl_status_fd, buf, + sizeof (buf))) != -1) + ; + + __bump_nl_timestamp (); + } +# endif else { /* Remove the descriptor from the epoll descriptor. */ @@ -2185,6 +2302,7 @@ main_loop_epoll (int efd) time_t laststart = now - ACCEPT_TIMEOUT; assert (starttime[sock] == 0); assert (inotify_fd == -1 || starttime[inotify_fd] == 0); + assert (nl_status_fd == -1 || starttime[nl_status_fd] == 0); for (int cnt = highest; cnt > STDERR_FILENO; --cnt) if (starttime[cnt] != 0 && starttime[cnt] < laststart) { diff --git a/nscd/nscd-client.h b/nscd/nscd-client.h index caad26a9cc..b5cd2d2c1e 100644 --- a/nscd/nscd-client.h +++ b/nscd/nscd-client.h @@ -260,12 +260,17 @@ struct hashentry /* Current persistent database version. */ -#define DB_VERSION 1 +#define DB_VERSION 2 /* Maximum time allowed between updates of the timestamp. */ #define MAPPING_TIMEOUT (5 * 60) +/* Used indices for the EXTRA_DATA element of 'database_pers_head'. + Each database has its own indices. */ +#define NSCD_HST_IDX_CONF_TIMESTAMP 0 + + /* Header of persistent database file. */ struct database_pers_head { @@ -274,6 +279,8 @@ struct database_pers_head volatile int32_t gc_cycle; volatile int32_t nscd_certainly_running; volatile nscd_time_t timestamp; + /* Room for extensions. */ + volatile uint32_t extra_data[4]; nscd_ssize_t module; nscd_ssize_t data_size; @@ -322,6 +329,12 @@ extern int __nscd_open_socket (const char *key, size_t keylen, request_type type, void *response, size_t responselen) attribute_hidden; +/* Try to get a file descriptor for the shared meory segment + containing the database. */ +extern struct mapped_database *__nscd_get_mapping (request_type type, + const char *key, + struct mapped_database **mappedp) attribute_hidden; + /* Get reference of mapping. */ extern struct mapped_database *__nscd_get_map_ref (request_type type, const char *name, @@ -371,4 +384,7 @@ extern ssize_t writeall (int fd, const void *buf, size_t len) extern ssize_t sendfileall (int tofd, int fromfd, off_t off, size_t len) attribute_hidden; +/* Get netlink timestamp counter from mapped area or zero. */ +extern uint32_t __nscd_get_nl_timestamp (void); + #endif /* nscd.h */ diff --git a/nscd/nscd_gethst_r.c b/nscd/nscd_gethst_r.c index 70631fa961..6ee142d71b 100644 --- a/nscd/nscd_gethst_r.c +++ b/nscd/nscd_gethst_r.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1998-2005, 2006, 2007, 2008, 2009 +/* Copyright (C) 1998-2005, 2006, 2007, 2008, 2009, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. @@ -98,6 +98,27 @@ libc_freeres_fn (hst_map_free) } +uint32_t +__nscd_get_nl_timestamp (void) +{ + if (__nss_not_use_nscd_hosts != 0) + return 0; + + struct mapped_database *map = __hst_map_handle.mapped; + + if (map == NULL + || (map != NO_MAPPING + && map->head->nscd_certainly_running == 0 + && map->head->timestamp + MAPPING_TIMEOUT < time (NULL))) + map = __nscd_get_mapping (GETFDHST, "hosts", &__hst_map_handle.mapped); + + if (map == NO_MAPPING) + return 0; + + return map->head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP]; +} + + int __nss_have_localdomain attribute_hidden; static int diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c index fe63f9a7fe..365b599892 100644 --- a/nscd/nscd_helper.c +++ b/nscd/nscd_helper.c @@ -277,9 +277,9 @@ __nscd_unmap (struct mapped_database *mapped) /* Try to get a file descriptor for the shared meory segment containing the database. */ -static struct mapped_database * -get_mapping (request_type type, const char *key, - struct mapped_database **mappedp) +struct mapped_database * +__nscd_get_mapping (request_type type, const char *key, + struct mapped_database **mappedp) { struct mapped_database *result = NO_MAPPING; #ifdef SCM_RIGHTS @@ -449,8 +449,8 @@ __nscd_get_map_ref (request_type type, const char *name, || (cur->head->nscd_certainly_running == 0 && cur->head->timestamp + MAPPING_TIMEOUT < time (NULL)) || cur->head->data_size > cur->datasize) - cur = get_mapping (type, name, - (struct mapped_database **) &mapptr->mapped); + cur = __nscd_get_mapping (type, name, + (struct mapped_database **) &mapptr->mapped); if (__builtin_expect (cur != NO_MAPPING, 1)) { diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index a5aafe93ac..216c9cce5f 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -2386,7 +2386,7 @@ getaddrinfo (const char *name, const char *service, || (hints->ai_family == PF_INET6 && ! seen_ipv6)) { /* We cannot possibly return a valid answer. */ - free (in6ai); + __free_in6ai (in6ai); return EAI_NONAME; } } @@ -2400,7 +2400,7 @@ getaddrinfo (const char *name, const char *service, { if (hints->ai_flags & AI_NUMERICSERV) { - free (in6ai); + __free_in6ai (in6ai); return EAI_NONAME; } @@ -2422,7 +2422,7 @@ getaddrinfo (const char *name, const char *service, if (last_i != 0) { freeaddrinfo (p); - free (in6ai); + __free_in6ai (in6ai); return -(last_i & GAIH_EAI); } @@ -2434,7 +2434,7 @@ getaddrinfo (const char *name, const char *service, } else { - free (in6ai); + __free_in6ai (in6ai); return EAI_FAMILY; } @@ -2622,7 +2622,7 @@ getaddrinfo (const char *name, const char *service, p->ai_canonname = canonname; } - free (in6ai); + __free_in6ai (in6ai); if (p) { diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index af53f70c51..30320269c5 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -161,6 +161,6 @@ CFLAGS-mq_receive.c += -fexceptions endif ifeq ($(subdir),nscd) -sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_SENDFILE -DHAVE_INOTIFY +sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_SENDFILE -DHAVE_INOTIFY -DHAVE_NETLINK CFLAGS-gai.c += -DNEED_NETLINK endif diff --git a/sysdeps/unix/sysv/linux/check_pf.c b/sysdeps/unix/sysv/linux/check_pf.c index d5ad7ea2e5..1f66684e4f 100644 --- a/sysdeps/unix/sysv/linux/check_pf.c +++ b/sysdeps/unix/sysv/linux/check_pf.c @@ -1,5 +1,5 @@ /* Determine protocol families for which interfaces exist. Linux version. - Copyright (C) 2003, 2006, 2007, 2008, 2010, 2011 Free Software Foundation, Inc. + Copyright (C) 2003, 2006-2008, 2010, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -33,6 +33,9 @@ #include <not-cancel.h> #include <kernel-features.h> +#include <bits/libc-lock.h> +#include <atomic.h> +#include <nscd/nscd-client.h> #ifndef IFA_F_HOMEADDRESS @@ -43,9 +46,42 @@ #endif -static int -make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6, - struct in6addrinfo **in6ai, size_t *in6ailen) +struct cached_data +{ + uint32_t timestamp; + uint32_t usecnt; + bool seen_ipv4; + bool seen_ipv6; + size_t in6ailen; + struct in6addrinfo in6ai[0]; +}; + +static struct cached_data noai6ai_cached = + { + .usecnt = 3, /* Make sure we never try to delete this entry. */ + .in6ailen = 0 + }; + +static struct cached_data *cache; +__libc_lock_define_initialized (static, lock); + + +#ifdef IS_IN_nscd +static uint32_t nl_timestamp; + +uint32_t +__bump_nl_timestamp (void) +{ + if (atomic_increment_val (&nl_timestamp) == 0) + atomic_increment (&nl_timestamp); + + return nl_timestamp; +} +#endif + + +static struct cached_data * +make_request (int fd, pid_t pid) { struct req { @@ -99,9 +135,6 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6, sizeof (nladdr))) < 0) goto out_fail; - *seen_ipv4 = false; - *seen_ipv6 = false; - bool done = false; struct in6ailist { @@ -109,6 +142,8 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6, struct in6ailist *next; } *in6ailist = NULL; size_t in6ailistlen = 0; + bool seen_ipv4 = false; + bool seen_ipv6 = false; do { @@ -172,12 +207,12 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6, { if (*(const in_addr_t *) address != htonl (INADDR_LOOPBACK)) - *seen_ipv4 = true; + seen_ipv4 = true; } else { if (!IN6_IS_ADDR_LOOPBACK (address)) - *seen_ipv6 = true; + seen_ipv6 = true; } } @@ -211,30 +246,46 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6, } while (! done); - if (*seen_ipv6 && in6ailist != NULL) + struct cached_data *result; + if (seen_ipv6 && in6ailist != NULL) { - *in6ai = malloc (in6ailistlen * sizeof (**in6ai)); - if (*in6ai == NULL) + result = malloc (sizeof (*result) + + in6ailistlen * sizeof (struct in6addrinfo)); + if (result == NULL) goto out_fail; - *in6ailen = in6ailistlen; +#ifdef IS_IN_nscd + result->timestamp = nl_timestamp; +#else + result->timestamp = __nscd_get_nl_timestamp (); +#endif + result->usecnt = 2; + result->seen_ipv4 = seen_ipv4; + result->seen_ipv6 = true; + result->in6ailen = in6ailistlen; do { - (*in6ai)[--in6ailistlen] = in6ailist->info; + result->in6ai[--in6ailistlen] = in6ailist->info; in6ailist = in6ailist->next; } while (in6ailist != NULL); } + else + { + noai6ai_cached.seen_ipv4 = seen_ipv4; + noai6ai_cached.seen_ipv6 = seen_ipv6; + result = &noai6ai_cached; + } if (use_malloc) free (buf); - return 0; + return result; out_fail: if (use_malloc) free (buf); - return -1; + return NULL; } @@ -258,28 +309,65 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6, if (! __no_netlink_support) { - int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); + struct cached_data *olddata = NULL; + struct cached_data *data = NULL; - if (__builtin_expect (fd >= 0, 1)) + __libc_lock_lock (lock); + +#ifdef IS_IN_nscd +# define cache_valid() nl_timestamp != 0 && cache->timestamp == nl_timestamp +#else +# define cache_valid() \ + ({ uint32_t val = __nscd_get_nl_timestamp (); \ + val != 0 && cache->timestamp == val; }) +#endif + if (cache != NULL && cache_valid ()) + { + data = cache; + atomic_increment (&cache->usecnt); + } + else { - struct sockaddr_nl nladdr; - memset (&nladdr, '\0', sizeof (nladdr)); - nladdr.nl_family = AF_NETLINK; + int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE); - socklen_t addr_len = sizeof (nladdr); + if (__builtin_expect (fd >= 0, 1)) + { + struct sockaddr_nl nladdr; + memset (&nladdr, '\0', sizeof (nladdr)); + nladdr.nl_family = AF_NETLINK; + + socklen_t addr_len = sizeof (nladdr); + + if(__bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0 + && __getsockname (fd, (struct sockaddr *) &nladdr, + &addr_len) == 0) + data = make_request (fd, nladdr.nl_pid); + + close_not_cancel_no_status (fd); + } + + if (data != NULL) + { + olddata = cache; + cache = data; + } + } - bool success - = (__bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0 - && __getsockname (fd, (struct sockaddr *) &nladdr, - &addr_len) == 0 - && make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6, - in6ai, in6ailen) == 0); + __libc_lock_unlock (lock); - close_not_cancel_no_status (fd); + if (data != NULL) + { + /* It worked. */ + *seen_ipv4 = data->seen_ipv4; + *seen_ipv6 = data->seen_ipv6; + *in6ailen = data->in6ailen; + *in6ai = data->in6ai; + + if (olddata != NULL && olddata->usecnt > 0 + && atomic_add_zero (&olddata->usecnt, -1)) + free (olddata); - if (success) - /* It worked. */ - return; + return; } #if __ASSUME_NETLINK_SUPPORT == 0 @@ -318,3 +406,26 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6, (void) freeifaddrs (ifa); #endif } + + +void +__free_in6ai (struct in6addrinfo *ai) +{ + if (ai != NULL) + { + struct cached_data *data = + (struct cached_data *) ((char *) ai + - offsetof (struct cached_data, in6ai)); + + if (atomic_add_zero (&data->usecnt, -1)) + { + __libc_lock_lock (lock); + + if (data->usecnt == 0) + /* Still unused. */ + free (data); + + __libc_lock_unlock (lock); + } + } +} |