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[IPV6]: ROUTE: Add support for Router Preference (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 17:04:53 -08:00 committed by David S. Miller
parent 8238dd0698
commit ebacaaa0fd
6 changed files with 49 additions and 7 deletions
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11
include/linux/icmpv6.h
View File

@ -40,14 +40,16 @@ struct icmp6hdr {
struct icmpv6_nd_ra {
__u8 hop_limit;
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u8 reserved:6,
__u8 reserved:4,
router_pref:2,
other:1,
managed:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
__u8 managed:1,
other:1,
reserved:6;
router_pref:2,
reserved:4;
#else
#error "Please fix <asm/byteorder.h>"
#endif
@ -70,8 +72,13 @@ struct icmp6hdr {
#define icmp6_addrconf_managed icmp6_dataun.u_nd_ra.managed
#define icmp6_addrconf_other icmp6_dataun.u_nd_ra.other
#define icmp6_rt_lifetime icmp6_dataun.u_nd_ra.rt_lifetime
#define icmp6_router_pref icmp6_dataun.u_nd_ra.router_pref
};
#define ICMPV6_ROUTER_PREF_LOW 0x3
#define ICMPV6_ROUTER_PREF_MEDIUM 0x0
#define ICMPV6_ROUTER_PREF_HIGH 0x1
#define ICMPV6_ROUTER_PREF_INVALID 0x2
#define ICMPV6_DEST_UNREACH 1
#define ICMPV6_PKT_TOOBIG 2

8
include/linux/ipv6_route.h
View File

@ -27,8 +27,16 @@
#define RTF_FLOW 0x02000000 /* flow significant route */
#define RTF_POLICY 0x04000000 /* policy route */
#define RTF_PREF(pref) ((pref) << 27)
#define RTF_PREF_MASK 0x18000000
#define RTF_LOCAL 0x80000000
#ifdef __KERNEL__
#define IPV6_EXTRACT_PREF(flag) (((flag) & RTF_PREF_MASK) >> 27)
#define IPV6_DECODE_PREF(pref) ((pref) ^ 2) /* 1:low,2:med,3:high */
#endif
struct in6_rtmsg {
struct in6_addr rtmsg_dst;
struct in6_addr rtmsg_src;

3
include/net/ip6_route.h
View File

@ -87,7 +87,8 @@ extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
extern struct rt6_info * rt6_get_dflt_router(struct in6_addr *addr,
struct net_device *dev);
extern struct rt6_info * rt6_add_dflt_router(struct in6_addr *gwaddr,
struct net_device *dev);
struct net_device *dev,
unsigned int pref);
extern void rt6_purge_dflt_routers(void);

11
net/ipv6/Kconfig
View File

@ -38,6 +38,17 @@ config IPV6_PRIVACY
See <file:Documentation/networking/ip-sysctl.txt> for details.
config IPV6_ROUTER_PREF
bool "IPv6: Router Preference (RFC 4191) support"
depends on IPV6
---help---
Router Preference is an optional extension to the Router
Advertisement message to improve the ability of hosts
to pick more appropriate router, especially when the hosts
is placed in a multi-homed network.
If unsure, say N.
config INET6_AH
tristate "IPv6: AH transformation"
depends on IPV6

12
net/ipv6/ndisc.c
View File

@ -1023,6 +1023,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
int lifetime;
struct ndisc_options ndopts;
int optlen;
unsigned int pref = 0;
__u8 * opt = (__u8 *)(ra_msg + 1);
@ -1086,6 +1087,13 @@ static void ndisc_router_discovery(struct sk_buff *skb)
lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
#ifdef CONFIG_IPV6_ROUTER_PREF
pref = ra_msg->icmph.icmp6_router_pref;
/* 10b is handled as if it were 00b (medium) */
if (pref == ICMPV6_ROUTER_PREF_INVALID)
pref = ICMPV6_ROUTER_PREF_MEDIUM;
#endif
rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
if (rt)
@ -1101,7 +1109,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
ND_PRINTK3(KERN_DEBUG
"ICMPv6 RA: adding default router.\n");
rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev, pref);
if (rt == NULL) {
ND_PRINTK0(KERN_ERR
"ICMPv6 RA: %s() failed to add default route.\n",
@ -1120,6 +1128,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
neigh->flags |= NTF_ROUTER;
} else if (rt) {
rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
}
if (rt)

11
net/ipv6/route.c
View File

@ -251,8 +251,11 @@ static int rt6_score_route(struct rt6_info *rt, int oif,
int m = rt6_check_dev(rt, oif);
if (!m && (strict & RT6_SELECT_F_IFACE))
return -1;
#ifdef CONFIG_IPV6_ROUTER_PREF
m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
#endif
if (rt6_check_neigh(rt))
m |= 4;
m |= 16;
else if (strict & RT6_SELECT_F_REACHABLE)
return -1;
return m;
@ -1256,7 +1259,8 @@ struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *d
}
struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
struct net_device *dev)
struct net_device *dev,
unsigned int pref)
{
struct in6_rtmsg rtmsg;
@ -1264,7 +1268,8 @@ struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
rtmsg.rtmsg_type = RTMSG_NEWROUTE;
ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
rtmsg.rtmsg_metric = 1024;
rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES;
rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES |
RTF_PREF(pref);
rtmsg.rtmsg_ifindex = dev->ifindex;