[IPV6] SIT: Add SIOCGETPRL ioctl to get/dump PRL.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 84c1ed2..08a483a 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -203,12 +203,73 @@
struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
for (p = t->prl; p; p = p->next)
- if (p->entry.addr == addr)
+ if (p->addr == addr)
break;
return p;
}
+static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
+{
+ struct ip_tunnel_prl *kp;
+ struct ip_tunnel_prl_entry *prl;
+ unsigned int cmax, c = 0, ca, len;
+ int ret = 0;
+
+ cmax = a->datalen / sizeof(*a);
+ if (cmax > 1 && a->addr != htonl(INADDR_ANY))
+ cmax = 1;
+
+ /* For simple GET or for root users,
+ * we try harder to allocate.
+ */
+ kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
+ kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
+ NULL;
+
+ read_lock(&ipip6_lock);
+
+ ca = t->prl_count < cmax ? t->prl_count : cmax;
+
+ if (!kp) {
+ /* We don't try hard to allocate much memory for
+ * non-root users.
+ * For root users, retry allocating enough memory for
+ * the answer.
+ */
+ kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
+ if (!kp) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+
+ c = 0;
+ for (prl = t->prl; prl; prl = prl->next) {
+ if (c > cmax)
+ break;
+ if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr)
+ continue;
+ kp[c].addr = prl->addr;
+ kp[c].flags = prl->flags;
+ c++;
+ if (a->addr != htonl(INADDR_ANY))
+ break;
+ }
+out:
+ read_unlock(&ipip6_lock);
+
+ len = sizeof(*kp) * c;
+ ret = len ? copy_to_user(a->data, kp, len) : 0;
+
+ kfree(kp);
+ if (ret)
+ return -EFAULT;
+
+ a->datalen = len;
+ return 0;
+}
+
static int
ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
{
@@ -221,7 +282,7 @@
write_lock(&ipip6_lock);
for (p = t->prl; p; p = p->next) {
- if (p->entry.addr == a->addr) {
+ if (p->addr == a->addr) {
if (chg)
goto update;
err = -EEXIST;
@@ -242,8 +303,10 @@
p->next = t->prl;
t->prl = p;
+ t->prl_count++;
update:
- p->entry = *a;
+ p->addr = a->addr;
+ p->flags = a->flags;
out:
write_unlock(&ipip6_lock);
return err;
@@ -259,10 +322,11 @@
if (a && a->addr != htonl(INADDR_ANY)) {
for (p = &t->prl; *p; p = &(*p)->next) {
- if ((*p)->entry.addr == a->addr) {
+ if ((*p)->addr == a->addr) {
x = *p;
*p = x->next;
kfree(x);
+ t->prl_count--;
goto out;
}
}
@@ -272,6 +336,7 @@
x = t->prl;
t->prl = t->prl->next;
kfree(x);
+ t->prl_count--;
}
}
out:
@@ -313,7 +378,7 @@
read_lock(&ipip6_lock);
p = __ipip6_tunnel_locate_prl(t, iph->saddr);
if (p) {
- if (p->entry.flags & PRL_DEFAULT)
+ if (p->flags & PRL_DEFAULT)
skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
else
skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
@@ -899,11 +964,12 @@
err = 0;
break;
+ case SIOCGETPRL:
case SIOCADDPRL:
case SIOCDELPRL:
case SIOCCHGPRL:
err = -EPERM;
- if (!capable(CAP_NET_ADMIN))
+ if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN))
goto done;
err = -EINVAL;
if (dev == ipip6_fb_tunnel_dev)
@@ -915,11 +981,23 @@
if (!(t = netdev_priv(dev)))
goto done;
- if (cmd == SIOCDELPRL)
+ switch (cmd) {
+ case SIOCGETPRL:
+ err = ipip6_tunnel_get_prl(t, &prl);
+ if (!err && copy_to_user(ifr->ifr_ifru.ifru_data,
+ &prl, sizeof(prl)))
+ err = -EFAULT;
+ break;
+ case SIOCDELPRL:
err = ipip6_tunnel_del_prl(t, &prl);
- else
+ break;
+ case SIOCADDPRL:
+ case SIOCCHGPRL:
err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
- netdev_state_change(dev);
+ break;
+ }
+ if (cmd != SIOCGETPRL)
+ netdev_state_change(dev);
break;
default: