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Diffstat (limited to 'net/xfrm/xfrm_user.c')
-rw-r--r--net/xfrm/xfrm_user.c350
1 files changed, 310 insertions, 40 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 3e6a722d072e..c59a78d2923a 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -10,6 +10,7 @@
*
*/
+#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
@@ -27,6 +28,9 @@
#include <net/xfrm.h>
#include <net/netlink.h>
#include <asm/uaccess.h>
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+#include <linux/in6.h>
+#endif
static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{
@@ -86,6 +90,22 @@ static int verify_encap_tmpl(struct rtattr **xfrma)
return 0;
}
+static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
+ xfrm_address_t **addrp)
+{
+ struct rtattr *rt = xfrma[type - 1];
+
+ if (!rt)
+ return 0;
+
+ if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
+ return -EINVAL;
+
+ if (addrp)
+ *addrp = RTA_DATA(rt);
+
+ return 0;
+}
static inline int verify_sec_ctx_len(struct rtattr **xfrma)
{
@@ -156,6 +176,19 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
goto out;
break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case IPPROTO_DSTOPTS:
+ case IPPROTO_ROUTING:
+ if (xfrma[XFRMA_ALG_COMP-1] ||
+ xfrma[XFRMA_ALG_AUTH-1] ||
+ xfrma[XFRMA_ALG_CRYPT-1] ||
+ xfrma[XFRMA_ENCAP-1] ||
+ xfrma[XFRMA_SEC_CTX-1] ||
+ !xfrma[XFRMA_COADDR-1])
+ goto out;
+ break;
+#endif
+
default:
goto out;
};
@@ -170,11 +203,14 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
goto out;
if ((err = verify_sec_ctx_len(xfrma)))
goto out;
+ if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
+ goto out;
err = -EINVAL;
switch (p->mode) {
- case 0:
- case 1:
+ case XFRM_MODE_TRANSPORT:
+ case XFRM_MODE_TUNNEL:
+ case XFRM_MODE_ROUTEOPTIMIZATION:
break;
default:
@@ -212,6 +248,7 @@ static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
return -ENOMEM;
memcpy(p, ualg, len);
+ strcpy(p->alg_name, algo->name);
*algpp = p;
return 0;
}
@@ -258,6 +295,24 @@ static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
return security_xfrm_state_alloc(x, uctx);
}
+static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
+{
+ struct rtattr *rta = u_arg;
+ xfrm_address_t *p, *uaddrp;
+
+ if (!rta)
+ return 0;
+
+ uaddrp = RTA_DATA(rta);
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ memcpy(p, uaddrp, sizeof(*p));
+ *addrpp = p;
+ return 0;
+}
+
static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
{
memcpy(&x->id, &p->id, sizeof(x->id));
@@ -347,7 +402,8 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
goto error;
if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
goto error;
-
+ if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
+ goto error;
err = xfrm_init_state(x);
if (err)
goto error;
@@ -416,16 +472,48 @@ out:
return err;
}
+static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
+ struct rtattr **xfrma,
+ int *errp)
+{
+ struct xfrm_state *x = NULL;
+ int err;
+
+ if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
+ err = -ESRCH;
+ x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
+ } else {
+ xfrm_address_t *saddr = NULL;
+
+ err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
+ if (err)
+ goto out;
+
+ if (!saddr) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
+ p->family);
+ }
+
+ out:
+ if (!x && errp)
+ *errp = err;
+ return x;
+}
+
static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
struct xfrm_state *x;
- int err;
+ int err = -ESRCH;
struct km_event c;
struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
- x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
+ x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
if (x == NULL)
- return -ESRCH;
+ return err;
if ((err = security_xfrm_state_delete(x)) != 0)
goto out;
@@ -519,6 +607,13 @@ static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
uctx->ctx_len = x->security->ctx_len;
memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
}
+
+ if (x->coaddr)
+ RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
+
+ if (x->lastused)
+ RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
+
nlh->nlmsg_len = skb->tail - b;
out:
sp->this_idx++;
@@ -540,7 +635,7 @@ static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
info.nlmsg_flags = NLM_F_MULTI;
info.this_idx = 0;
info.start_idx = cb->args[0];
- (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
+ (void) xfrm_state_walk(0, dump_one_state, &info);
cb->args[0] = info.this_idx;
return skb->len;
@@ -576,10 +671,9 @@ static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
struct xfrm_state *x;
struct sk_buff *resp_skb;
- int err;
+ int err = -ESRCH;
- x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
- err = -ESRCH;
+ x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
if (x == NULL)
goto out_noput;
@@ -692,6 +786,22 @@ static int verify_policy_dir(__u8 dir)
return 0;
}
+static int verify_policy_type(__u8 type)
+{
+ switch (type) {
+ case XFRM_POLICY_TYPE_MAIN:
+#ifdef CONFIG_XFRM_SUB_POLICY
+ case XFRM_POLICY_TYPE_SUB:
+#endif
+ break;
+
+ default:
+ return -EINVAL;
+ };
+
+ return 0;
+}
+
static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
{
switch (p->share) {
@@ -785,6 +895,29 @@ static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
return 0;
}
+static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
+{
+ struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
+ struct xfrm_userpolicy_type *upt;
+ __u8 type = XFRM_POLICY_TYPE_MAIN;
+ int err;
+
+ if (rt) {
+ if (rt->rta_len < sizeof(*upt))
+ return -EINVAL;
+
+ upt = RTA_DATA(rt);
+ type = upt->type;
+ }
+
+ err = verify_policy_type(type);
+ if (err)
+ return err;
+
+ *tp = type;
+ return 0;
+}
+
static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
{
xp->priority = p->priority;
@@ -823,16 +956,20 @@ static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p,
copy_from_user_policy(xp, p);
+ err = copy_from_user_policy_type(&xp->type, xfrma);
+ if (err)
+ goto error;
+
if (!(err = copy_from_user_tmpl(xp, xfrma)))
err = copy_from_user_sec_ctx(xp, xfrma);
-
- if (err) {
- *errp = err;
- kfree(xp);
- xp = NULL;
- }
+ if (err)
+ goto error;
return xp;
+ error:
+ *errp = err;
+ kfree(xp);
+ return NULL;
}
static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
@@ -909,27 +1046,63 @@ rtattr_failure:
return -1;
}
-static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
+static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
{
- if (xp->security) {
- int ctx_size = sizeof(struct xfrm_sec_ctx) +
- xp->security->ctx_len;
- struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
- struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+ int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
+ struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
+ struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+ uctx->exttype = XFRMA_SEC_CTX;
+ uctx->len = ctx_size;
+ uctx->ctx_doi = s->ctx_doi;
+ uctx->ctx_alg = s->ctx_alg;
+ uctx->ctx_len = s->ctx_len;
+ memcpy(uctx + 1, s->ctx_str, s->ctx_len);
+ return 0;
- uctx->exttype = XFRMA_SEC_CTX;
- uctx->len = ctx_size;
- uctx->ctx_doi = xp->security->ctx_doi;
- uctx->ctx_alg = xp->security->ctx_alg;
- uctx->ctx_len = xp->security->ctx_len;
- memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len);
+ rtattr_failure:
+ return -1;
+}
+
+static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
+{
+ if (x->security) {
+ return copy_sec_ctx(x->security, skb);
}
return 0;
+}
- rtattr_failure:
+static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+ if (xp->security) {
+ return copy_sec_ctx(xp->security, skb);
+ }
+ return 0;
+}
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+ struct xfrm_userpolicy_type upt;
+
+ memset(&upt, 0, sizeof(upt));
+ upt.type = xp->type;
+
+ RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
+
+ return 0;
+
+rtattr_failure:
return -1;
}
+#else
+static inline int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+ return 0;
+}
+#endif
+
static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
struct xfrm_dump_info *sp = ptr;
@@ -953,6 +1126,8 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr
goto nlmsg_failure;
if (copy_to_user_sec_ctx(xp, skb))
goto nlmsg_failure;
+ if (copy_to_user_policy_type(xp, skb) < 0)
+ goto nlmsg_failure;
nlh->nlmsg_len = skb->tail - b;
out:
@@ -974,7 +1149,10 @@ static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
info.nlmsg_flags = NLM_F_MULTI;
info.this_idx = 0;
info.start_idx = cb->args[0];
- (void) xfrm_policy_walk(dump_one_policy, &info);
+ (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
+#ifdef CONFIG_XFRM_SUB_POLICY
+ (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
+#endif
cb->args[0] = info.this_idx;
return skb->len;
@@ -1010,6 +1188,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
{
struct xfrm_policy *xp;
struct xfrm_userpolicy_id *p;
+ __u8 type = XFRM_POLICY_TYPE_MAIN;
int err;
struct km_event c;
int delete;
@@ -1017,12 +1196,16 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
p = NLMSG_DATA(nlh);
delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
+ err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
+ if (err)
+ return err;
+
err = verify_policy_dir(p->dir);
if (err)
return err;
if (p->index)
- xp = xfrm_policy_byid(p->dir, p->index, delete);
+ xp = xfrm_policy_byid(type, p->dir, p->index, delete);
else {
struct rtattr **rtattrs = (struct rtattr **)xfrma;
struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
@@ -1039,7 +1222,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
return err;
}
- xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete);
+ xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
security_xfrm_policy_free(&tmp);
}
if (xp == NULL)
@@ -1222,9 +1405,16 @@ out:
static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
{
-struct km_event c;
+ struct km_event c;
+ __u8 type = XFRM_POLICY_TYPE_MAIN;
+ int err;
+
+ err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
+ if (err)
+ return err;
- xfrm_policy_flush();
+ xfrm_policy_flush(type);
+ c.data.type = type;
c.event = nlh->nlmsg_type;
c.seq = nlh->nlmsg_seq;
c.pid = nlh->nlmsg_pid;
@@ -1237,10 +1427,15 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void *
struct xfrm_policy *xp;
struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
struct xfrm_userpolicy_info *p = &up->pol;
+ __u8 type = XFRM_POLICY_TYPE_MAIN;
int err = -ENOENT;
+ err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
+ if (err)
+ return err;
+
if (p->index)
- xp = xfrm_policy_byid(p->dir, p->index, 0);
+ xp = xfrm_policy_byid(type, p->dir, p->index, 0);
else {
struct rtattr **rtattrs = (struct rtattr **)xfrma;
struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
@@ -1257,7 +1452,7 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void *
if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
return err;
}
- xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0);
+ xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
security_xfrm_policy_free(&tmp);
}
@@ -1384,6 +1579,7 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
[XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
[XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
+ [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
};
#undef XMSGSIZE
@@ -1708,7 +1904,9 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
if (copy_to_user_tmpl(xp, skb) < 0)
goto nlmsg_failure;
- if (copy_to_user_sec_ctx(xp, skb))
+ if (copy_to_user_state_sec_ctx(x, skb))
+ goto nlmsg_failure;
+ if (copy_to_user_policy_type(xp, skb) < 0)
goto nlmsg_failure;
nlh->nlmsg_len = skb->tail - b;
@@ -1742,7 +1940,7 @@ static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
/* User gives us xfrm_user_policy_info followed by an array of 0
* or more templates.
*/
-static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
+static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
u8 *data, int len, int *dir)
{
struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
@@ -1750,7 +1948,7 @@ static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
struct xfrm_policy *xp;
int nr;
- switch (family) {
+ switch (sk->sk_family) {
case AF_INET:
if (opt != IP_XFRM_POLICY) {
*dir = -EOPNOTSUPP;
@@ -1790,8 +1988,18 @@ static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
}
copy_from_user_policy(xp, p);
+ xp->type = XFRM_POLICY_TYPE_MAIN;
copy_templates(xp, ut, nr);
+ if (!xp->security) {
+ int err = security_xfrm_sock_policy_alloc(xp, sk);
+ if (err) {
+ kfree(xp);
+ *dir = err;
+ return NULL;
+ }
+ }
+
*dir = p->dir;
return xp;
@@ -1814,6 +2022,8 @@ static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
goto nlmsg_failure;
if (copy_to_user_sec_ctx(xp, skb))
goto nlmsg_failure;
+ if (copy_to_user_policy_type(xp, skb) < 0)
+ goto nlmsg_failure;
upe->hard = !!hard;
nlh->nlmsg_len = skb->tail - b;
@@ -1885,6 +2095,8 @@ static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *
copy_to_user_policy(xp, p, dir);
if (copy_to_user_tmpl(xp, skb) < 0)
goto nlmsg_failure;
+ if (copy_to_user_policy_type(xp, skb) < 0)
+ goto nlmsg_failure;
nlh->nlmsg_len = skb->tail - b;
@@ -1902,6 +2114,9 @@ static int xfrm_notify_policy_flush(struct km_event *c)
struct nlmsghdr *nlh;
struct sk_buff *skb;
unsigned char *b;
+#ifdef CONFIG_XFRM_SUB_POLICY
+ struct xfrm_userpolicy_type upt;
+#endif
int len = NLMSG_LENGTH(0);
skb = alloc_skb(len, GFP_ATOMIC);
@@ -1911,6 +2126,13 @@ static int xfrm_notify_policy_flush(struct km_event *c)
nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
+ nlh->nlmsg_flags = 0;
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+ memset(&upt, 0, sizeof(upt));
+ upt.type = c->data.type;
+ RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
+#endif
nlh->nlmsg_len = skb->tail - b;
@@ -1918,6 +2140,9 @@ static int xfrm_notify_policy_flush(struct km_event *c)
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
nlmsg_failure:
+#ifdef CONFIG_XFRM_SUB_POLICY
+rtattr_failure:
+#endif
kfree_skb(skb);
return -1;
}
@@ -1942,19 +2167,64 @@ static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_ev
}
+static int build_report(struct sk_buff *skb, u8 proto,
+ struct xfrm_selector *sel, xfrm_address_t *addr)
+{
+ struct xfrm_user_report *ur;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+
+ nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
+ ur = NLMSG_DATA(nlh);
+ nlh->nlmsg_flags = 0;
+
+ ur->proto = proto;
+ memcpy(&ur->sel, sel, sizeof(ur->sel));
+
+ if (addr)
+ RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
+
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
+ xfrm_address_t *addr)
+{
+ struct sk_buff *skb;
+ size_t len;
+
+ len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (skb == NULL)
+ return -ENOMEM;
+
+ if (build_report(skb, proto, sel, addr) < 0)
+ BUG();
+
+ NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
+ return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
+}
+
static struct xfrm_mgr netlink_mgr = {
.id = "netlink",
.notify = xfrm_send_state_notify,
.acquire = xfrm_send_acquire,
.compile_policy = xfrm_compile_policy,
.notify_policy = xfrm_send_policy_notify,
+ .report = xfrm_send_report,
};
static int __init xfrm_user_init(void)
{
struct sock *nlsk;
- printk(KERN_INFO "Initializing IPsec netlink socket\n");
+ printk(KERN_INFO "Initializing XFRM netlink socket\n");
nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
xfrm_netlink_rcv, THIS_MODULE);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 19:06:58 +0000