Commit fd5d687b authored by Christoph Hellwig's avatar Christoph Hellwig Committed by David S. Miller
Browse files

sit: refactor ipip6_tunnel_ioctl 



Split the ioctl handler into one function per command instead of having
a all the logic sit in one giant switch statement.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c7e36705

net/ipv6/sit.c

+210 −158
Original line number Diff line number Diff line
@@ -83,6 +83,13 @@ struct sit_net { 
	struct net_device *fb_tunnel_dev;

};



static inline struct sit_net *dev_to_sit_net(struct net_device *dev)

{

	struct ip_tunnel *t = netdev_priv(dev);



	return net_generic(t->net, sit_net_id);

}



/*

 * Must be invoked with rcu_read_lock

 */
@@ -291,14 +298,18 @@ __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 


}



static int ipip6_tunnel_get_prl(struct ip_tunnel *t,

				struct ip_tunnel_prl __user *a)

static int ipip6_tunnel_get_prl(struct net_device *dev, struct ifreq *ifr)

{

	struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data;

	struct ip_tunnel *t = netdev_priv(dev);

	struct ip_tunnel_prl kprl, *kp;

	struct ip_tunnel_prl_entry *prl;

	unsigned int cmax, c = 0, ca, len;

	int ret = 0;



	if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)

		return -EINVAL;



	if (copy_from_user(&kprl, a, sizeof(kprl)))

		return -EFAULT;

	cmax = kprl.datalen / sizeof(kprl);
@@ -441,6 +452,35 @@ out: 
	return err;

}



static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr,

		int cmd)

{

	struct ip_tunnel *t = netdev_priv(dev);

	struct ip_tunnel_prl prl;

	int err;



	if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))

		return -EPERM;

	if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)

		return -EINVAL;



	if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))

		return -EFAULT;



	switch (cmd) {

	case SIOCDELPRL:

		err = ipip6_tunnel_del_prl(t, &prl);

		break;

	case SIOCADDPRL:

	case SIOCCHGPRL:

		err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);

		break;

	}

	dst_cache_reset(&t->dst_cache);

	netdev_state_change(dev);

	return err;

}



static int

isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)

{
@@ -1151,7 +1191,53 @@ static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 
	netdev_state_change(t->dev);

	return 0;

}

#endif



static int

ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr)

{

	struct ip_tunnel *t = netdev_priv(dev);

	struct ip_tunnel_6rd ip6rd;

	struct ip_tunnel_parm p;



	if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {

		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))

			return -EFAULT;

		t = ipip6_tunnel_locate(t->net, &p, 0);

	}

	if (!t)

		t = netdev_priv(dev);



	ip6rd.prefix = t->ip6rd.prefix;

	ip6rd.relay_prefix = t->ip6rd.relay_prefix;

	ip6rd.prefixlen = t->ip6rd.prefixlen;

	ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;

	if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd)))

		return -EFAULT;

	return 0;

}



static int

ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd)

{

	struct ip_tunnel *t = netdev_priv(dev);

	struct ip_tunnel_6rd ip6rd;

	int err;



	if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))

		return -EPERM;

	if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd)))

		return -EFAULT;



	if (cmd != SIOCDEL6RD) {

		err = ipip6_tunnel_update_6rd(t, &ip6rd);

		if (err < 0)

			return err;

	} else

		ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev));

	return 0;

}



#endif /* CONFIG_IPV6_SIT_6RD */



static bool ipip6_valid_ip_proto(u8 ipproto)

{
@@ -1164,185 +1250,151 @@ static bool ipip6_valid_ip_proto(u8 ipproto) 
}



static int

ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)

__ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p)

{

	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))

		return -EPERM;



	if (!ipip6_valid_ip_proto(p->iph.protocol))

		return -EINVAL;

	if (p->iph.version != 4 ||

	    p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))

		return -EINVAL;



	if (p->iph.ttl)

		p->iph.frag_off |= htons(IP_DF);

	return 0;

}



static int

ipip6_tunnel_get(struct net_device *dev, struct ifreq *ifr)

{

	int err = 0;

	struct ip_tunnel_parm p;

	struct ip_tunnel_prl prl;

	struct ip_tunnel *t = netdev_priv(dev);

	struct net *net = t->net;

	struct sit_net *sitn = net_generic(net, sit_net_id);

#ifdef CONFIG_IPV6_SIT_6RD

	struct ip_tunnel_6rd ip6rd;

#endif

	struct ip_tunnel_parm p;



	switch (cmd) {

	case SIOCGETTUNNEL:

#ifdef CONFIG_IPV6_SIT_6RD

	case SIOCGET6RD:

#endif

		if (dev == sitn->fb_tunnel_dev) {

			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {

				err = -EFAULT;

				break;

	if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {

		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))

			return -EFAULT;

		t = ipip6_tunnel_locate(t->net, &p, 0);

	}

			t = ipip6_tunnel_locate(net, &p, 0);

	if (!t)

		t = netdev_priv(dev);

		}



		err = -EFAULT;

		if (cmd == SIOCGETTUNNEL) {

			memcpy(&p, &t->parms, sizeof(p));

			if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,

					 sizeof(p)))

				goto done;

#ifdef CONFIG_IPV6_SIT_6RD

		} else {

			ip6rd.prefix = t->ip6rd.prefix;

			ip6rd.relay_prefix = t->ip6rd.relay_prefix;

			ip6rd.prefixlen = t->ip6rd.prefixlen;

			ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;

			if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,

					 sizeof(ip6rd)))

				goto done;

#endif

	if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))

		return -EFAULT;

	return 0;

}

		err = 0;

		break;



	case SIOCADDTUNNEL:

	case SIOCCHGTUNNEL:

		err = -EPERM;

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))

			goto done;

static int

ipip6_tunnel_add(struct net_device *dev, struct ifreq *ifr)

{

	struct ip_tunnel *t = netdev_priv(dev);

	struct ip_tunnel_parm p;

	int err;



		err = -EFAULT;

	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))

			goto done;

		return -EFAULT;

	err = __ipip6_tunnel_ioctl_validate(t->net, &p);

	if (err)

		return err;



	t = ipip6_tunnel_locate(t->net, &p, 1);

	if (!t)

		return -ENOBUFS;



		err = -EINVAL;

		if (!ipip6_valid_ip_proto(p.iph.protocol))

			goto done;

		if (p.iph.version != 4 ||

		    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))

			goto done;

		if (p.iph.ttl)

			p.iph.frag_off |= htons(IP_DF);

	if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))

		return -EFAULT;

	return 0;

}



static int

ipip6_tunnel_change(struct net_device *dev, struct ifreq *ifr)

{

	struct ip_tunnel *t = netdev_priv(dev);

	struct ip_tunnel_parm p;

	int err;



		t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);

	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))

		return -EFAULT;

	err = __ipip6_tunnel_ioctl_validate(t->net, &p);

	if (err)

		return err;



		if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {

	t = ipip6_tunnel_locate(t->net, &p, 0);

	if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {

		if (!t)

			return -ENOENT;

	} else {

		if (t) {

				if (t->dev != dev) {

					err = -EEXIST;

					break;

				}

			if (t->dev != dev)

				return -EEXIST;

		} else {

			if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||

				    (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {

					err = -EINVAL;

					break;

				}

			    (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))

				return -EINVAL;

			t = netdev_priv(dev);

		}



		ipip6_tunnel_update(t, &p, t->fwmark);

	}



		if (t) {

			err = 0;

	if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))

				err = -EFAULT;

		} else

			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);

		break;

		return -EFAULT;

	return 0;

}



	case SIOCDELTUNNEL:

		err = -EPERM;

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))

			goto done;

static int

ipip6_tunnel_del(struct net_device *dev, struct ifreq *ifr)

{

	struct ip_tunnel *t = netdev_priv(dev);

	struct ip_tunnel_parm p;



		if (dev == sitn->fb_tunnel_dev) {

			err = -EFAULT;

	if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))

		return -EPERM;



	if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {

		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))

				goto done;

			err = -ENOENT;

			t = ipip6_tunnel_locate(net, &p, 0);

			return -EFAULT;

		t = ipip6_tunnel_locate(t->net, &p, 0);

		if (!t)

				goto done;

			err = -EPERM;

			if (t == netdev_priv(sitn->fb_tunnel_dev))

				goto done;

			return -ENOENT;

		if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev))

			return -EPERM;

		dev = t->dev;

	}

	unregister_netdevice(dev);

		err = 0;

		break;

	return 0;

}



static int

ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)

{

	switch (cmd) {

	case SIOCGETTUNNEL:

		return ipip6_tunnel_get(dev, ifr);

	case SIOCADDTUNNEL:

		return ipip6_tunnel_add(dev, ifr);

	case SIOCCHGTUNNEL:

		return ipip6_tunnel_change(dev, ifr);

	case SIOCDELTUNNEL:

		return ipip6_tunnel_del(dev, ifr);

	case SIOCGETPRL:

		err = -EINVAL;

		if (dev == sitn->fb_tunnel_dev)

			goto done;

		err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);

		break;



		return ipip6_tunnel_get_prl(dev, ifr);

	case SIOCADDPRL:

	case SIOCDELPRL:

	case SIOCCHGPRL:

		err = -EPERM;

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))

			goto done;

		err = -EINVAL;

		if (dev == sitn->fb_tunnel_dev)

			goto done;

		err = -EFAULT;

		if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))

			goto done;



		switch (cmd) {

		case SIOCDELPRL:

			err = ipip6_tunnel_del_prl(t, &prl);

			break;

		case SIOCADDPRL:

		case SIOCCHGPRL:

			err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);

			break;

		}

		dst_cache_reset(&t->dst_cache);

		netdev_state_change(dev);

		break;



		return ipip6_tunnel_prl_ctl(dev, ifr, cmd);

#ifdef CONFIG_IPV6_SIT_6RD

	case SIOCGET6RD:

		return ipip6_tunnel_get6rd(dev, ifr);

	case SIOCADD6RD:

	case SIOCCHG6RD:

	case SIOCDEL6RD:

		err = -EPERM;

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))

			goto done;



		err = -EFAULT;

		if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,

				   sizeof(ip6rd)))

			goto done;



		if (cmd != SIOCDEL6RD) {

			err = ipip6_tunnel_update_6rd(t, &ip6rd);

			if (err < 0)

				goto done;

		} else

			ipip6_tunnel_clone_6rd(dev, sitn);



		err = 0;

		break;

		return ipip6_tunnel_6rdctl(dev, ifr, cmd);

#endif



	default:

		err = -EINVAL;

		return -EINVAL;

	}



done:

	return err;

}



static const struct net_device_ops ipip6_netdev_ops = {

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