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

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index f20c224..f1fbe9c 100644 (file)
--- a/include/linux/if_tunnel.h
+++ b/include/linux/if_tunnel.h
@@ -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 */

diff --git a/include/net/ipip.h b/include/net/ipip.h
index 205536a..633ed4d 100644 (file)
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -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 {                                           \

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 84c1ed2..08a483a 100644 (file)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -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: