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[IPV6]: ROUTE: Add experimental support for Route Information Option in RA (RFC4191). 

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki 2006-03-20 17:06:24 -08:00 committed by David S. Miller
parent 52e1635631
commit 70ceb4f539
6 changed files with 191 additions and 1 deletions
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2
include/linux/ipv6_route.h
View File

@ -23,6 +23,8 @@
#define RTF_NONEXTHOP 0x00200000 /* route with no nexthop */
#define RTF_EXPIRES 0x00400000
#define RTF_ROUTEINFO 0x00800000 /* route information - RA */
#define RTF_CACHE 0x01000000 /* cache entry */
#define RTF_FLOW 0x02000000 /* flow significant route */
#define RTF_POLICY 0x04000000 /* policy route */

21
include/net/ip6_route.h
View File

@ -7,6 +7,23 @@
#define IP6_RT_PRIO_KERN 512
#define IP6_RT_FLOW_MASK 0x00ff
struct route_info {
__u8 type;
__u8 length;
__u8 prefix_len;
#if defined(__BIG_ENDIAN_BITFIELD)
__u8 reserved_h:3,
route_pref:2,
reserved_l:3;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
__u8 reserved_l:3,
route_pref:2,
reserved_h:3;
#endif
__u32 lifetime;
__u8 prefix[0]; /* 0,8 or 16 */
};
#ifdef __KERNEL__
#include <net/flow.h>
@ -92,6 +109,10 @@ extern struct rt6_info * rt6_add_dflt_router(struct in6_addr *gwaddr,
extern void rt6_purge_dflt_routers(void);
extern int rt6_route_rcv(struct net_device *dev,
u8 *opt, int len,
struct in6_addr *gwaddr);
extern void rt6_redirect(struct in6_addr *dest,
struct in6_addr *saddr,
struct neighbour *neigh,

2
include/net/ndisc.h
View File

@ -22,6 +22,8 @@ enum {
ND_OPT_PREFIX_INFO = 3, /* RFC2461 */
ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */
ND_OPT_MTU = 5, /* RFC2461 */
__ND_OPT_ARRAY_MAX,
ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
__ND_OPT_MAX
};

8
net/ipv6/Kconfig
View File

@ -49,6 +49,14 @@ config IPV6_ROUTER_PREF
If unsure, say N.
config IPV6_ROUTE_INFO
bool "IPv6: Route Information (RFC 4191) support (EXPERIMENTAL)"
depends on IPV6_ROUTER_PREF && EXPERIMENTAL
---help---
This is experimental support of Route Information.
If unsure, say N.
config INET6_AH
tristate "IPv6: AH transformation"
depends on IPV6

25
net/ipv6/ndisc.c
View File

@ -156,7 +156,11 @@ struct neigh_table nd_tbl = {
/* ND options */
struct ndisc_options {
struct nd_opt_hdr *nd_opt_array[__ND_OPT_MAX];
struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
#ifdef CONFIG_IPV6_ROUTE_INFO
struct nd_opt_hdr *nd_opts_ri;
struct nd_opt_hdr *nd_opts_ri_end;
#endif
};
#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
@ -255,6 +259,13 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0)
ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
break;
#ifdef CONFIG_IPV6_ROUTE_INFO
case ND_OPT_ROUTE_INFO:
ndopts->nd_opts_ri_end = nd_opt;
if (!ndopts->nd_opts_ri)
ndopts->nd_opts_ri = nd_opt;
break;
#endif
default:
/*
* Unknown options must be silently ignored,
@ -1202,6 +1213,18 @@ static void ndisc_router_discovery(struct sk_buff *skb)
NEIGH_UPDATE_F_ISROUTER);
}
#ifdef CONFIG_IPV6_ROUTE_INFO
if (ndopts.nd_opts_ri) {
struct nd_opt_hdr *p;
for (p = ndopts.nd_opts_ri;
p;
p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
&skb->nh.ipv6h->saddr);
}
}
#endif
if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
struct nd_opt_hdr *p;
for (p = ndopts.nd_opts_pi;

134
net/ipv6/route.c
View File

@ -98,6 +98,14 @@ static int ip6_pkt_discard_out(struct sk_buff *skb);
static void ip6_link_failure(struct sk_buff *skb);
static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
#ifdef CONFIG_IPV6_ROUTE_INFO
static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
struct in6_addr *gwaddr, int ifindex,
unsigned pref);
static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
struct in6_addr *gwaddr, int ifindex);
#endif
static struct dst_ops ip6_dst_ops = {
.family = AF_INET6,
.protocol = __constant_htons(ETH_P_IPV6),
@ -346,6 +354,84 @@ static struct rt6_info *rt6_select(struct rt6_info **head, int oif,
return (match ? match : &ip6_null_entry);
}
#ifdef CONFIG_IPV6_ROUTE_INFO
int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
struct in6_addr *gwaddr)
{
struct route_info *rinfo = (struct route_info *) opt;
struct in6_addr prefix_buf, *prefix;
unsigned int pref;
u32 lifetime;
struct rt6_info *rt;
if (len < sizeof(struct route_info)) {
return -EINVAL;
}
/* Sanity check for prefix_len and length */
if (rinfo->length > 3) {
return -EINVAL;
} else if (rinfo->prefix_len > 128) {
return -EINVAL;
} else if (rinfo->prefix_len > 64) {
if (rinfo->length < 2) {
return -EINVAL;
}
} else if (rinfo->prefix_len > 0) {
if (rinfo->length < 1) {
return -EINVAL;
}
}
pref = rinfo->route_pref;
if (pref == ICMPV6_ROUTER_PREF_INVALID)
pref = ICMPV6_ROUTER_PREF_MEDIUM;
lifetime = htonl(rinfo->lifetime);
if (lifetime == 0xffffffff) {
/* infinity */
} else if (lifetime > 0x7fffffff/HZ) {
/* Avoid arithmetic overflow */
lifetime = 0x7fffffff/HZ - 1;
}
if (rinfo->length == 3)
prefix = (struct in6_addr *)rinfo->prefix;
else {
/* this function is safe */
ipv6_addr_prefix(&prefix_buf,
(struct in6_addr *)rinfo->prefix,
rinfo->prefix_len);
prefix = &prefix_buf;
}
rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex);
if (rt && !lifetime) {
ip6_del_rt(rt, NULL, NULL, NULL);
rt = NULL;
}
if (!rt && lifetime)
rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
pref);
else if (rt)
rt->rt6i_flags = RTF_ROUTEINFO |
(rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
if (rt) {
if (lifetime == 0xffffffff) {
rt->rt6i_flags &= ~RTF_EXPIRES;
} else {
rt->rt6i_expires = jiffies + HZ * lifetime;
rt->rt6i_flags |= RTF_EXPIRES;
}
dst_release(&rt->u.dst);
}
return 0;
}
#endif
struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
int oif, int strict)
{
@ -1277,6 +1363,54 @@ static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
return rt;
}
#ifdef CONFIG_IPV6_ROUTE_INFO
static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
struct in6_addr *gwaddr, int ifindex)
{
struct fib6_node *fn;
struct rt6_info *rt = NULL;
write_lock_bh(&rt6_lock);
fn = fib6_locate(&ip6_routing_table, prefix ,prefixlen, NULL, 0);
if (!fn)
goto out;
for (rt = fn->leaf; rt; rt = rt->u.next) {
if (rt->rt6i_dev->ifindex != ifindex)
continue;
if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
continue;
if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
continue;
dst_hold(&rt->u.dst);
break;
}
out:
write_unlock_bh(&rt6_lock);
return rt;
}
static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
struct in6_addr *gwaddr, int ifindex,
unsigned pref)
{
struct in6_rtmsg rtmsg;
memset(&rtmsg, 0, sizeof(rtmsg));
rtmsg.rtmsg_type = RTMSG_NEWROUTE;
ipv6_addr_copy(&rtmsg.rtmsg_dst, prefix);
rtmsg.rtmsg_dst_len = prefixlen;
ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
rtmsg.rtmsg_metric = 1024;
rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | RTF_UP | RTF_PREF(pref);
rtmsg.rtmsg_ifindex = ifindex;
ip6_route_add(&rtmsg, NULL, NULL, NULL);
return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex);
}
#endif
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
{
struct rt6_info *rt;