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-rw-r--r--ggsn/ggsn.c23
-rw-r--r--lib/in46_addr.c48
-rw-r--r--lib/in46_addr.h3
-rw-r--r--lib/ippool.c35
-rw-r--r--lib/ippool.h4
-rw-r--r--lib/tun.c48
-rw-r--r--lib/tun.h11
-rw-r--r--tests/lib/ippool_test.c40
-rw-r--r--tests/lib/ippool_test.err2
-rw-r--r--tests/lib/ippool_test.ok264
10 files changed, 438 insertions, 40 deletions
diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c
index 67d040f..9cfe085 100644
--- a/ggsn/ggsn.c
+++ b/ggsn/ggsn.c
@@ -149,6 +149,10 @@ int apn_stop(struct apn_ctx *apn, bool force)
/* actually start the APN with its current config */
int apn_start(struct apn_ctx *apn)
{
+ int ipv4_blacklist_size = 0, ipv6_blacklist_size = 0;
+ struct in46_prefix ipv4_tun_ip, ipv6_tun_ip, ipv6_tun_linklocal_ip;
+ int ippool_flags = IPPOOL_NONETWORK | IPPOOL_NOBROADCAST;
+
if (apn->started)
return 0;
@@ -201,12 +205,13 @@ int apn_start(struct apn_ctx *apn)
}
if (apn->cfg.apn_type_mask & (APN_TYPE_IPv6|APN_TYPE_IPv4v6)) {
- if (tun_ipv6_linklocal_get(apn->tun.tun, &apn->v6_lladdr) < 0) {
+ if (tun_ipv6_local_get(apn->tun.tun, &ipv6_tun_linklocal_ip, IPV6_TYPE_LINK) < 0) {
LOGPAPN(LOGL_ERROR, apn, "Cannot obtain IPv6 link-local address of "
"interface: %s\n", strerror(errno));
apn_stop(apn, false);
return -1;
}
+ apn->v6_lladdr = ipv6_tun_linklocal_ip.addr.v6;
}
/* set back-pointer from TUN device to APN */
@@ -229,8 +234,14 @@ int apn_start(struct apn_ctx *apn)
if (apn->v4.cfg.dynamic_prefix.addr.len) {
LOGPAPN(LOGL_INFO, apn, "Creating IPv4 pool %s\n",
in46p_ntoa(&apn->v4.cfg.dynamic_prefix));
+ if(tun_ipv4_local_get(apn->tun.tun, &ipv4_tun_ip) == 0) {
+ ipv4_blacklist_size = 1;
+ LOGPAPN(LOGL_INFO, apn, "Blacklist IPv4 tun IP %s\n",
+ in46p_ntoa(&ipv4_tun_ip));
+ }
if (ippool_new(&apn->v4.pool, &apn->v4.cfg.dynamic_prefix,
- &apn->v4.cfg.static_prefix, 0)) {
+ &apn->v4.cfg.static_prefix, ippool_flags,
+ &ipv4_tun_ip, ipv4_blacklist_size)) {
LOGPAPN(LOGL_ERROR, apn, "Failed to create IPv4 pool\n");
apn_stop(apn, false);
return -1;
@@ -241,8 +252,14 @@ int apn_start(struct apn_ctx *apn)
if (apn->v6.cfg.dynamic_prefix.addr.len) {
LOGPAPN(LOGL_INFO, apn, "Creating IPv6 pool %s\n",
in46p_ntoa(&apn->v6.cfg.dynamic_prefix));
+ if(tun_ipv6_local_get(apn->tun.tun, &ipv6_tun_ip, IPV6_TYPE_GLOBAL) == 0) {
+ ipv6_blacklist_size = 1;
+ LOGPAPN(LOGL_INFO, apn, "Blacklist IPv6 tun IP %s\n",
+ in46p_ntoa(&ipv6_tun_ip));
+ }
if (ippool_new(&apn->v6.pool, &apn->v6.cfg.dynamic_prefix,
- &apn->v6.cfg.static_prefix, 0)) {
+ &apn->v6.cfg.static_prefix, ippool_flags,
+ &ipv6_tun_ip, ipv6_blacklist_size)) {
LOGPAPN(LOGL_ERROR, apn, "Failed to create IPv6 pool\n");
apn_stop(apn, false);
return -1;
diff --git a/lib/in46_addr.c b/lib/in46_addr.c
index 068499c..7901be9 100644
--- a/lib/in46_addr.c
+++ b/lib/in46_addr.c
@@ -195,6 +195,54 @@ int in46a_within_mask(const struct in46_addr *addr, const struct in46_addr *net,
}
}
+unsigned int netmask_ipv4_prefixlen(const struct in_addr *netmask)
+{
+ struct in_addr tmp = *netmask;
+ int prefix = 0;
+
+ while (tmp.s_addr & 0x01) {
+ prefix++;
+ tmp.s_addr = tmp.s_addr >> 1;
+ }
+ return prefix;
+}
+
+unsigned int netmask_ipv6_prefixlen(const struct in6_addr *netmask)
+{
+ struct in6_addr tmp = *netmask;
+ int prefix = 0;
+
+ #if defined(__linux__)
+ #define ADDRFIELD(i) s6_addr32[i]
+ #else
+ #define ADDRFIELD(i) __u6_addr.__u6_addr32[i]
+ #endif
+
+ for (int i = 0; i < 4; i++) {
+ while (tmp.ADDRFIELD(i) & 0x01) {
+ prefix++;
+ tmp.ADDRFIELD(i) = tmp.ADDRFIELD(i) >> 1;
+ }
+ }
+
+ #undef ADDRFIELD
+
+ return prefix;
+}
+
+unsigned int in46a_prefixlen(const struct in46_addr *netmask)
+{
+ switch (netmask->len) {
+ case 4:
+ return netmask_ipv4_prefixlen(&netmask->v4);
+ case 16:
+ return netmask_ipv6_prefixlen(&netmask->v6);
+ default:
+ OSMO_ASSERT(0);
+ return 0;
+ }
+}
+
/*! Convert given PDP End User Address to in46_addr
* \returns 0 on success; negative on error */
int in46a_to_eua(const struct in46_addr *src, struct ul66_t *eua)
diff --git a/lib/in46_addr.h b/lib/in46_addr.h
index ce2df14..109a933 100644
--- a/lib/in46_addr.h
+++ b/lib/in46_addr.h
@@ -27,6 +27,9 @@ extern const char *in46p_ntoa(const struct in46_prefix *in46p);
extern int in46a_equal(const struct in46_addr *a, const struct in46_addr *b);
extern int in46a_prefix_equal(const struct in46_addr *a, const struct in46_addr *b);
extern int in46a_within_mask(const struct in46_addr *addr, const struct in46_addr *net, size_t prefixlen);
+extern unsigned int netmask_ipv4_prefixlen(const struct in_addr *netmask);
+extern unsigned int netmask_ipv6_prefixlen(const struct in6_addr *netmask);
+extern unsigned int in46a_prefixlen(const struct in46_addr *netmask);
int in46a_to_eua(const struct in46_addr *src, struct ul66_t *eua);
int in46a_from_eua(const struct ul66_t *eua, struct in46_addr *dst);
diff --git a/lib/ippool.c b/lib/ippool.c
index 03323e2..f1b4223 100644
--- a/lib/ippool.c
+++ b/lib/ippool.c
@@ -184,9 +184,18 @@ void in46a_inc(struct in46_addr *addr)
}
}
+static bool addr_in_prefix_list(struct in46_addr *addr, struct in46_prefix *list, size_t list_size)
+{
+ for (int i = 0; i < list_size; i++) {
+ if(in46a_prefix_equal(addr, &list[i].addr))
+ return true;
+ }
+ return false;
+}
+
/* Create new address pool */
int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn, const struct in46_prefix *stat,
- int flags)
+ int flags, struct in46_prefix *blacklist, size_t blacklist_size)
{
/* Parse only first instance of pool for now */
@@ -210,18 +219,16 @@ int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn, const stru
if (addr.len == sizeof(struct in6_addr))
addr.len = 64/8;
- /* Set IPPOOL_NONETWORK if IPPOOL_NOGATEWAY is set */
- if (flags & IPPOOL_NOGATEWAY) {
- flags |= IPPOOL_NONETWORK;
- }
-
dynsize = (1 << (addr.len*8 - addrprefixlen));
if (flags & IPPOOL_NONETWORK) /* Exclude network address from pool */
dynsize--;
- if (flags & IPPOOL_NOGATEWAY) /* Exclude gateway address from pool */
- dynsize--;
if (flags & IPPOOL_NOBROADCAST) /* Exclude broadcast address from pool */
dynsize--;
+ /* Exclude included blacklist addresses from pool */
+ for (int i = 0; i < blacklist_size; i++) {
+ if (in46a_within_mask(&blacklist[i].addr, &addr, addrprefixlen))
+ dynsize--;
+ }
}
if (!stat || stat->addr.len == 0) {
@@ -278,13 +285,17 @@ int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn, const stru
(*this)->firstdyn = NULL;
(*this)->lastdyn = NULL;
- if (flags & IPPOOL_NOGATEWAY) {
- in46a_inc(&addr);
- in46a_inc(&addr);
- } else if (flags & IPPOOL_NONETWORK) {
+ if (flags & IPPOOL_NONETWORK) {
in46a_inc(&addr);
}
for (i = 0; i < dynsize; i++) {
+ if (addr_in_prefix_list(&addr, blacklist, blacklist_size)) {
+ SYS_ERR(DIP, LOGL_DEBUG, 0,
+ "addr blacklisted from pool: %s", in46a_ntoa(&addr));
+ in46a_inc(&addr);
+ i--;
+ continue;
+ }
(*this)->member[i].addr = addr;
in46a_inc(&addr);
diff --git a/lib/ippool.h b/lib/ippool.h
index 56beb4e..efb274b 100644
--- a/lib/ippool.h
+++ b/lib/ippool.h
@@ -31,7 +31,6 @@
#define IPPOOL_NONETWORK 0x01
#define IPPOOL_NOBROADCAST 0x02
-#define IPPOOL_NOGATEWAY 0x04
#define IPPOOL_STATSIZE 0x10000
@@ -72,7 +71,8 @@ extern unsigned long int ippool_hash(struct in46_addr *addr);
/* Create new address pool */
extern int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn,
- const struct in46_prefix *stat, int flags);
+ const struct in46_prefix *stat, int flags,
+ struct in46_prefix *blacklist, size_t blacklist_size);
/* Delete existing address pool */
extern int ippool_free(struct ippool_t *this);
diff --git a/lib/tun.c b/lib/tun.c
index 7662146..2ebb96d 100644
--- a/lib/tun.c
+++ b/lib/tun.c
@@ -751,8 +751,40 @@ int tun_runscript(struct tun_t *tun, char *script)
#include <ifaddrs.h>
-/* obtain the link-local address of the tun device */
-int tun_ipv6_linklocal_get(const struct tun_t *tun, struct in6_addr *ia)
+/* Obtain the local address of the tun device */
+int tun_ipv4_local_get(const struct tun_t *tun, struct in46_prefix *prefix)
+{
+ struct ifaddrs *ifaddr, *ifa;
+
+ if (getifaddrs(&ifaddr) == -1) {
+ return -1;
+ }
+
+ for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+ struct sockaddr_in *sin4 = (struct sockaddr_in *) ifa->ifa_addr;
+ struct sockaddr_in *netmask4 = (struct sockaddr_in *) ifa->ifa_netmask;
+ if (ifa->ifa_addr == NULL)
+ continue;
+
+ if (ifa->ifa_addr->sa_family != AF_INET)
+ continue;
+
+ if (strcmp(ifa->ifa_name, tun->devname))
+ continue;
+
+ prefix->addr.len = sizeof(sin4->sin_addr);
+ prefix->addr.v4 = sin4->sin_addr;
+ prefix->prefixlen = netmask_ipv4_prefixlen(&netmask4->sin_addr);
+ freeifaddrs(ifaddr);
+ return 0;
+ }
+ freeifaddrs(ifaddr);
+ return -1;
+}
+
+/* Obtain the local address of the tun device.
+ Type of IPv6 address can be specified with "flags = IPV6_TYPE_LINK | IPV6_TYPE_GLOBAL" */
+int tun_ipv6_local_get(const struct tun_t *tun, struct in46_prefix *prefix, int flags)
{
struct ifaddrs *ifaddr, *ifa;
static const uint8_t ll_prefix[] = { 0xfe,0x80, 0,0, 0,0, 0,0 };
@@ -763,6 +795,7 @@ int tun_ipv6_linklocal_get(const struct tun_t *tun, struct in6_addr *ia)
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
+ struct sockaddr_in6 *netmask6 = (struct sockaddr_in6 *) ifa->ifa_netmask;
if (ifa->ifa_addr == NULL)
continue;
@@ -772,10 +805,17 @@ int tun_ipv6_linklocal_get(const struct tun_t *tun, struct in6_addr *ia)
if (strcmp(ifa->ifa_name, tun->devname))
continue;
- if (memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix)))
+ if (!(flags & IPV6_TYPE_LINK) &&
+ !memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix)))
+ continue;
+
+ if (!(flags & IPV6_TYPE_GLOBAL) &&
+ memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix)))
continue;
- *ia = sin6->sin6_addr;
+ prefix->addr.len = sizeof(sin6->sin6_addr);
+ prefix->addr.v6 = sin6->sin6_addr;
+ prefix->prefixlen = netmask_ipv6_prefixlen(&netmask6->sin6_addr);
freeifaddrs(ifaddr);
return 0;
}
diff --git a/lib/tun.h b/lib/tun.h
index f63be50..de867dd 100644
--- a/lib/tun.h
+++ b/lib/tun.h
@@ -23,6 +23,14 @@
#define TUN_NLBUFSIZE 1024
#include "config.h"
+
+/* ipv6 ip type flags for tun_ipv6_local_get() */
+enum {
+ IPV6_TYPE_LINK = 1,
+ IPV6_TYPE_GLOBAL = 2,
+};
+
+
#ifndef HAVE_IPHDR
struct iphdr
{
@@ -85,6 +93,7 @@ extern int tun_set_cb_ind(struct tun_t *this,
extern int tun_runscript(struct tun_t *tun, char *script);
-int tun_ipv6_linklocal_get(const struct tun_t *tun, struct in6_addr *ia);
+int tun_ipv4_local_get(const struct tun_t *tun, struct in46_prefix *prefix);
+int tun_ipv6_local_get(const struct tun_t *tun, struct in46_prefix *prefix, int flags);
#endif /* !_TUN_H */
diff --git a/tests/lib/ippool_test.c b/tests/lib/ippool_test.c
index 1d0c3a2..04306ef 100644
--- a/tests/lib/ippool_test.c
+++ b/tests/lib/ippool_test.c
@@ -13,36 +13,46 @@
#include "../../lib/syserr.h"
-static struct ippool_t *create_pool(const char *prefix_str, unsigned int flags)
+static struct ippool_t *create_pool(const char *prefix_str, unsigned int flags, char **blacklist, size_t blacklist_size)
{
+ struct in46_prefix *blacklist_pfx;
struct ippool_t *pool;
struct in46_prefix pfx;
size_t t;
int rc;
+ blacklist_pfx = calloc(blacklist_size, sizeof(struct in46_prefix));
+ for (int i = 0; i < blacklist_size; i++) {
+ rc = ippool_aton(&blacklist_pfx[i].addr, &t, blacklist[i], 0);
+ OSMO_ASSERT(rc == 0);
+ pfx.prefixlen = t;
+ }
+
/* dynamic-only v4 */
- rc = ippool_aton(&pfx.addr, &t, prefix_str, flags);
+ rc = ippool_aton(&pfx.addr, &t, prefix_str, 0);
OSMO_ASSERT(rc == 0);
pfx.prefixlen = t;
- rc = ippool_new(&pool, &pfx, NULL, flags);
+ rc = ippool_new(&pool, &pfx, NULL, flags, blacklist_pfx, blacklist_size);
OSMO_ASSERT(rc == 0);
//ippool_printaddr(pool);
+ free(blacklist_pfx);
+
return pool;
}
-static int test_pool_size(const char *pfx, unsigned int flags, unsigned int expected_size)
+static void test_pool_size(const char *pfx, unsigned int flags, char **blacklist, size_t blacklist_size, unsigned int expected_size)
{
struct ippool_t *pool;
struct ippoolm_t *member;
struct in46_addr addr;
int i, rc, n;
- printf("testing pool for prefix %s, flags=0x%x, expected_size=%u\n", pfx, flags, expected_size);
- pool = create_pool(pfx, flags);
+ printf("testing pool for prefix %s, flags=0x%x, blacklist_size=%lu, expected_size=%u\n", pfx, flags, blacklist_size, expected_size);
+ pool = create_pool(pfx, flags, blacklist, blacklist_size);
OSMO_ASSERT(pool->listsize == expected_size);
memset(&addr, 0, sizeof(addr));
@@ -88,24 +98,28 @@ static int test_pool_size(const char *pfx, unsigned int flags, unsigned int expe
ippool_free(pool);
}
-static int test_pool_sizes(void)
+static void test_pool_sizes(void)
{
- struct ippool_t *pool;
/* 256 addresses [0..255] */
- test_pool_size("192.168.23.0/24", 0, 256);
+ test_pool_size("192.168.23.0/24", 0, NULL, 0, 256);
/* 255 addresses [1..255] */
- test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK, 255);
+ test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK, NULL, 0, 255);
/* 254 addresses [1..254] */
- test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, 254);
+ test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, NULL, 0, 254);
/* 65534 addresses [0.1..255.254] */
- test_pool_size("192.168.0.0/16", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, 65534);
+ test_pool_size("192.168.0.0/16", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, NULL, 0, 65534);
/* 256 prefixes of /64 each */
- test_pool_size("2001:DB8::/56", 0, 256);
+ test_pool_size("2001:DB8::/56", 0, NULL, 0, 256);
+
+ /* 253 addresses [1..254] & exclude 192.168.23.1/24 */
+ char *blacklist[] = {"176.16.222.10/24", "192.168.23.1/24", "192.168.38.2/24"};
+ test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, blacklist, 3, 253);
+
}
int main(int argc, char **argv)
diff --git a/tests/lib/ippool_test.err b/tests/lib/ippool_test.err
index 7dc5371..b11c12a 100644
--- a/tests/lib/ippool_test.err
+++ b/tests/lib/ippool_test.err
@@ -8,3 +8,5 @@ No more IP addresses available
No more IP addresses available
No more IP addresses available
No more IP addresses available
+No more IP addresses available
+No more IP addresses available
diff --git a/tests/lib/ippool_test.ok b/tests/lib/ippool_test.ok
index a0eeb4b..263494e 100644
--- a/tests/lib/ippool_test.ok
+++ b/tests/lib/ippool_test.ok
@@ -1,4 +1,4 @@
-testing pool for prefix 192.168.23.0/24, flags=0x0, expected_size=256
+testing pool for prefix 192.168.23.0/24, flags=0x0, blacklist_size=0, expected_size=256
allocated address 192.168.23.0
allocated address 192.168.23.1
allocated address 192.168.23.2
@@ -255,7 +255,7 @@ allocated address 192.168.23.252
allocated address 192.168.23.253
allocated address 192.168.23.254
allocated address 192.168.23.255
-testing pool for prefix 192.168.23.0/24, flags=0x1, expected_size=255
+testing pool for prefix 192.168.23.0/24, flags=0x1, blacklist_size=0, expected_size=255
allocated address 192.168.23.1
allocated address 192.168.23.2
allocated address 192.168.23.3
@@ -511,7 +511,7 @@ allocated address 192.168.23.252
allocated address 192.168.23.253
allocated address 192.168.23.254
allocated address 192.168.23.255
-testing pool for prefix 192.168.23.0/24, flags=0x3, expected_size=254
+testing pool for prefix 192.168.23.0/24, flags=0x3, blacklist_size=0, expected_size=254
allocated address 192.168.23.1
allocated address 192.168.23.2
allocated address 192.168.23.3
@@ -766,7 +766,7 @@ allocated address 192.168.23.251
allocated address 192.168.23.252
allocated address 192.168.23.253
allocated address 192.168.23.254
-testing pool for prefix 192.168.0.0/16, flags=0x3, expected_size=65534
+testing pool for prefix 192.168.0.0/16, flags=0x3, blacklist_size=0, expected_size=65534
allocated address 192.168.0.1
allocated address 192.168.0.2
allocated address 192.168.0.3
@@ -66301,7 +66301,7 @@ allocated address 192.168.255.251
allocated address 192.168.255.252
allocated address 192.168.255.253
allocated address 192.168.255.254
-testing pool for prefix 2001:DB8::/56, flags=0x0, expected_size=256
+testing pool for prefix 2001:DB8::/56, flags=0x0, blacklist_size=0, expected_size=256
allocated address 2001:db8::
allocated address 2001:db8:0:1::
allocated address 2001:db8:0:2::
@@ -66558,3 +66558,257 @@ allocated address 2001:db8:0:fc::
allocated address 2001:db8:0:fd::
allocated address 2001:db8:0:fe::
allocated address 2001:db8:0:ff::
+testing pool for prefix 192.168.23.0/24, flags=0x3, blacklist_size=3, expected_size=253
+allocated address 192.168.23.2
+allocated address 192.168.23.3
+allocated address 192.168.23.4
+allocated address 192.168.23.5
+allocated address 192.168.23.6
+allocated address 192.168.23.7
+allocated address 192.168.23.8
+allocated address 192.168.23.9
+allocated address 192.168.23.10
+allocated address 192.168.23.11
+allocated address 192.168.23.12
+allocated address 192.168.23.13
+allocated address 192.168.23.14
+allocated address 192.168.23.15
+allocated address 192.168.23.16
+allocated address 192.168.23.17
+allocated address 192.168.23.18
+allocated address 192.168.23.19
+allocated address 192.168.23.20
+allocated address 192.168.23.21
+allocated address 192.168.23.22
+allocated address 192.168.23.23
+allocated address 192.168.23.24
+allocated address 192.168.23.25
+allocated address 192.168.23.26
+allocated address 192.168.23.27
+allocated address 192.168.23.28
+allocated address 192.168.23.29
+allocated address 192.168.23.30
+allocated address 192.168.23.31
+allocated address 192.168.23.32
+allocated address 192.168.23.33
+allocated address 192.168.23.34
+allocated address 192.168.23.35
+allocated address 192.168.23.36
+allocated address 192.168.23.37
+allocated address 192.168.23.38
+allocated address 192.168.23.39
+allocated address 192.168.23.40
+allocated address 192.168.23.41
+allocated address 192.168.23.42
+allocated address 192.168.23.43
+allocated address 192.168.23.44
+allocated address 192.168.23.45
+allocated address 192.168.23.46
+allocated address 192.168.23.47
+allocated address 192.168.23.48
+allocated address 192.168.23.49
+allocated address 192.168.23.50
+allocated address 192.168.23.51
+allocated address 192.168.23.52
+allocated address 192.168.23.53
+allocated address 192.168.23.54
+allocated address 192.168.23.55
+allocated address 192.168.23.56
+allocated address 192.168.23.57
+allocated address 192.168.23.58
+allocated address 192.168.23.59
+allocated address 192.168.23.60
+allocated address 192.168.23.61
+allocated address 192.168.23.62
+allocated address 192.168.23.63
+allocated address 192.168.23.64
+allocated address 192.168.23.65
+allocated address 192.168.23.66
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generated by cgit v1.2.3 (git 2.25.1) at 2024-05-08 00:10:08 +0000