[IPV6] SIT: Add PRL management for ISATAP.

This patch updates the Linux the Intra-Site Automatic Tunnel Addressing
Protocol (ISATAP) implementation. It places the ISATAP potential router
list (PRL) in the kernel and adds three new private ioctls for PRL
management.

[Add several changes of structure name, constant names etc. - yoshfuji]

Signed-off-by: Fred L. Templin <fred.l.templin@boeing.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
Templin, Fred L 2008-03-11 18:35:59 -04:00 коммит произвёл YOSHIFUJI Hideaki
Родитель f0bdb7ba5a
Коммит fadf6bf060
7 изменённых файлов: 199 добавлений и 50 удалений

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@ -7,6 +7,9 @@
#define SIOCADDTUNNEL (SIOCDEVPRIVATE + 1)
#define SIOCDELTUNNEL (SIOCDEVPRIVATE + 2)
#define SIOCCHGTUNNEL (SIOCDEVPRIVATE + 3)
#define SIOCADDPRL (SIOCDEVPRIVATE + 5)
#define SIOCDELPRL (SIOCDEVPRIVATE + 6)
#define SIOCCHGPRL (SIOCDEVPRIVATE + 7)
#define GRE_CSUM __constant_htons(0x8000)
#define GRE_ROUTING __constant_htons(0x4000)
@ -17,9 +20,6 @@
#define GRE_FLAGS __constant_htons(0x00F8)
#define GRE_VERSION __constant_htons(0x0007)
/* i_flags values for SIT mode */
#define SIT_ISATAP 0x0001
struct ip_tunnel_parm
{
char name[IFNAMSIZ];
@ -31,4 +31,16 @@ struct ip_tunnel_parm
struct iphdr iph;
};
/* SIT-mode i_flags */
#define SIT_ISATAP 0x0001
struct ip_tunnel_prl {
__be32 addr;
__u16 flags;
__u16 __reserved;
};
/* PRL flags */
#define PRL_DEFAULT 0x0001
#endif /* _IF_TUNNEL_H_ */

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@ -313,7 +313,8 @@ struct sk_buff {
__u16 tc_verd; /* traffic control verdict */
#endif
#endif
/* 2 byte hole */
__u8 ndisc_nodetype:2;
/* 14 bit hole */
#ifdef CONFIG_NET_DMA
dma_cookie_t dma_cookie;

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@ -24,6 +24,13 @@ struct ip_tunnel
int mlink;
struct ip_tunnel_parm parms;
struct ip_tunnel_prl_entry *prl; /* potential router list */
};
struct ip_tunnel_prl_entry
{
struct ip_tunnel_prl_entry *next;
struct ip_tunnel_prl entry;
};
#define IPTUNNEL_XMIT() do { \

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@ -11,6 +11,15 @@
#define NDISC_NEIGHBOUR_ADVERTISEMENT 136
#define NDISC_REDIRECT 137
/*
* Router type: cross-layer information from link-layer to
* IPv6 layer reported by certain link types (e.g., RFC4214).
*/
#define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */
#define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */
#define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */
#define NDISC_NODETYPE_DEFAULT 3 /* default router */
/*
* ndisc options
*/

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@ -1092,6 +1092,12 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 RA: from host or unauthorized router\n");
return;
}
/*
* set the RA_RECV flag in the interface
*/
@ -1115,6 +1121,10 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
/* skip link-specific parameters from interior routers */
if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
goto skip_linkparms;
if (in6_dev->if_flags & IF_RS_SENT) {
/*
* flag that an RA was received after an RS was sent
@ -1229,6 +1239,8 @@ skip_defrtr:
}
}
skip_linkparms:
/*
* Process options.
*/
@ -1268,6 +1280,10 @@ skip_defrtr:
}
#endif
/* skip link-specific ndopts from interior routers */
if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
goto out;
if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
struct nd_opt_hdr *p;
for (p = ndopts.nd_opts_pi;
@ -1331,6 +1347,14 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
int optlen;
u8 *lladdr = NULL;
switch (skb->ndisc_nodetype) {
case NDISC_NODETYPE_HOST:
case NDISC_NODETYPE_NODEFAULT:
ND_PRINTK2(KERN_WARNING
"ICMPv6 Redirect: from host or unauthorized router\n");
return;
}
if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 Redirect: source address is not link-local.\n");

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@ -1699,8 +1699,6 @@ struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *d
return rt;
}
EXPORT_SYMBOL(rt6_get_dflt_router);
struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
struct net_device *dev,
unsigned int pref)

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@ -16,7 +16,7 @@
* Changes:
* Roger Venning <r.venning@telstra.com>: 6to4 support
* Nate Thompson <nate@thebog.net>: 6to4 support
* Fred L. Templin <fltemplin@acm.org>: isatap support
* Fred Templin <fred.l.templin@boeing.com>: isatap support
*/
#include <linux/module.h>
@ -197,6 +197,119 @@ failed:
return NULL;
}
static struct ip_tunnel_prl_entry *
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)
break;
return p;
}
static int
ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
{
struct ip_tunnel_prl_entry *p;
for (p = t->prl; p; p = p->next) {
if (p->entry.addr == a->addr) {
if (chg) {
p->entry = *a;
return 0;
}
return -EEXIST;
}
}
if (chg)
return -ENXIO;
p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
if (!p)
return -ENOBUFS;
p->entry = *a;
p->next = t->prl;
t->prl = p;
return 0;
}
static int
ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
{
struct ip_tunnel_prl_entry *x, **p;
if (a) {
for (p = &t->prl; *p; p = &(*p)->next) {
if ((*p)->entry.addr == a->addr) {
x = *p;
*p = x->next;
kfree(x);
return 0;
}
}
return -ENXIO;
} else {
while (t->prl) {
x = t->prl;
t->prl = t->prl->next;
kfree(x);
}
}
return 0;
}
/* copied directly from anycast.c */
static int
ipip6_onlink(struct in6_addr *addr, struct net_device *dev)
{
struct inet6_dev *idev;
struct inet6_ifaddr *ifa;
int onlink;
onlink = 0;
rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
read_lock_bh(&idev->lock);
for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
onlink = ipv6_prefix_equal(addr, &ifa->addr,
ifa->prefix_len);
if (onlink)
break;
}
read_unlock_bh(&idev->lock);
}
rcu_read_unlock();
return onlink;
}
static int
isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
{
struct ip_tunnel_prl_entry *p = ipip6_tunnel_locate_prl(t, iph->saddr);
int ok = 1;
if (p) {
if (p->entry.flags & PRL_DEFAULT)
skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
else
skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
} else {
struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
if (ipv6_addr_is_isatap(addr6) &&
(addr6->s6_addr32[3] == iph->saddr) &&
ipip6_onlink(addr6, t->dev))
skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
else
ok = 0;
}
return ok;
}
static void ipip6_tunnel_uninit(struct net_device *dev)
{
if (dev == ipip6_fb_tunnel_dev) {
@ -206,6 +319,7 @@ static void ipip6_tunnel_uninit(struct net_device *dev)
dev_put(dev);
} else {
ipip6_tunnel_unlink(netdev_priv(dev));
ipip6_tunnel_del_prl(netdev_priv(dev), 0);
dev_put(dev);
}
}
@ -365,48 +479,6 @@ static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
IP6_ECN_set_ce(ipv6_hdr(skb));
}
/* ISATAP (RFC4214) - check source address */
static int
isatap_srcok(struct sk_buff *skb, struct iphdr *iph, struct net_device *dev)
{
struct neighbour *neigh;
struct dst_entry *dst;
struct rt6_info *rt;
struct flowi fl;
struct in6_addr *addr6;
struct in6_addr rtr;
struct ipv6hdr *iph6;
int ok = 0;
/* from onlink default router */
ipv6_addr_set(&rtr, htonl(0xFE800000), 0, 0, 0);
ipv6_isatap_eui64(rtr.s6_addr + 8, iph->saddr);
if ((rt = rt6_get_dflt_router(&rtr, dev))) {
dst_release(&rt->u.dst);
return 1;
}
iph6 = ipv6_hdr(skb);
memset(&fl, 0, sizeof(fl));
fl.proto = iph6->nexthdr;
ipv6_addr_copy(&fl.fl6_dst, &iph6->saddr);
fl.oif = dev->ifindex;
security_skb_classify_flow(skb, &fl);
dst = ip6_route_output(&init_net, NULL, &fl);
if (!dst->error && (dst->dev == dev) && (neigh = dst->neighbour)) {
addr6 = (struct in6_addr*)&neigh->primary_key;
/* from correct previous hop */
if (ipv6_addr_is_isatap(addr6) &&
(addr6->s6_addr32[3] == iph->saddr))
ok = 1;
}
dst_release(dst);
return ok;
}
static int ipip6_rcv(struct sk_buff *skb)
{
struct iphdr *iph;
@ -427,7 +499,7 @@ static int ipip6_rcv(struct sk_buff *skb)
skb->pkt_type = PACKET_HOST;
if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
!isatap_srcok(skb, iph, tunnel->dev)) {
!isatap_chksrc(skb, iph, tunnel)) {
tunnel->stat.rx_errors++;
read_unlock(&ipip6_lock);
kfree_skb(skb);
@ -707,6 +779,7 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
{
int err = 0;
struct ip_tunnel_parm p;
struct ip_tunnel_prl prl;
struct ip_tunnel *t;
switch (cmd) {
@ -806,6 +879,31 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
err = 0;
break;
case SIOCADDPRL:
case SIOCDELPRL:
case SIOCCHGPRL:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
goto done;
err = -EINVAL;
if (dev == ipip6_fb_tunnel_dev)
goto done;
err = -EFAULT;
if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
goto done;
err = -ENOENT;
if (!(t = netdev_priv(dev)))
goto done;
ipip6_tunnel_unlink(t);
if (cmd == SIOCDELPRL)
err = ipip6_tunnel_del_prl(t, &prl);
else
err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
ipip6_tunnel_link(t);
netdev_state_change(dev);
break;
default:
err = -EINVAL;
}