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[IPV6] SIT: Add SIOCGETPRL ioctl to get/dump PRL.

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Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
YOSHIFUJI Hideaki 2008-03-24 18:28:39 +09:00
parent 0009ae1f50
commit 300aaeeaab
3 changed files with 95 additions and 10 deletions
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4
include/linux/if_tunnel.h
View file

@ -7,6 +7,7 @@
#define SIOCADDTUNNEL (SIOCDEVPRIVATE + 1)
#define SIOCDELTUNNEL (SIOCDEVPRIVATE + 2)
#define SIOCCHGTUNNEL (SIOCDEVPRIVATE + 3)
#define SIOCGETPRL (SIOCDEVPRIVATE + 4)
#define SIOCADDPRL (SIOCDEVPRIVATE + 5)
#define SIOCDELPRL (SIOCDEVPRIVATE + 6)
#define SIOCCHGPRL (SIOCDEVPRIVATE + 7)
@ -38,6 +39,9 @@ struct ip_tunnel_prl {
__be32 addr;
__u16 flags;
__u16 __reserved;
__u32 datalen;
__u32 __reserved2;
void __user *data;
};
/* PRL flags */

5
include/net/ipip.h
View file

@ -24,13 +24,16 @@ struct ip_tunnel
int mlink;
struct ip_tunnel_parm parms;
struct ip_tunnel_prl_entry *prl; /* potential router list */
unsigned int prl_count; /* # of entries in PRL */
};
struct ip_tunnel_prl_entry
{
struct ip_tunnel_prl_entry *next;
struct ip_tunnel_prl entry;
__be32 addr;
u16 flags;
};
#define IPTUNNEL_XMIT() do { \

96
net/ipv6/sit.c
View file

@ -203,12 +203,73 @@ __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
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 @@ ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
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 @@ ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
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 @@ ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
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 @@ ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
x = t->prl;
t->prl = t->prl->next;
kfree(x);
t->prl_count--;
}
}
out:
@ -313,7 +378,7 @@ isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
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 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
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 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
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: