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[IPV6] NDISC: Don't rely on node-type hint from L2 unless required. 

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
YOSHIFUJI Hideaki 2008-03-15 23:59:18 -04:00
parent 52eeeb8481
commit de357cc013
3 changed files with 16 additions and 0 deletions
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2
include/linux/skbuff.h
View File

@ -313,7 +313,9 @@ struct sk_buff {
__u16 tc_verd; /* traffic control verdict */
#endif
#endif
#ifdef CONFIG_IPV6_NDISC_NODETYPE
__u8 ndisc_nodetype:2;
#endif
/* 14 bit hole */
#ifdef CONFIG_NET_DMA

4
net/ipv6/Kconfig
View File

@ -168,6 +168,7 @@ config IPV6_SIT
tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)"
depends on IPV6
select INET_TUNNEL
select IPV6_NDISC_NODETYPE
default y
---help---
Tunneling means encapsulating data of one protocol type within
@ -178,6 +179,9 @@ config IPV6_SIT
Saying M here will produce a module called sit.ko. If unsure, say Y.
config IPV6_NDISC_NODETYPE
bool
config IPV6_TUNNEL
tristate "IPv6: IP-in-IPv6 tunnel (RFC2473)"
select INET6_TUNNEL

10
net/ipv6/ndisc.c
View File

@ -1092,11 +1092,13 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
#ifdef CONFIG_IPV6_NDISC_NODETYPE
if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 RA: from host or unauthorized router\n");
return;
}
#endif
/*
* set the RA_RECV flag in the interface
@ -1121,9 +1123,11 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
#ifdef CONFIG_IPV6_NDISC_NODETYPE
/* skip link-specific parameters from interior routers */
if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
goto skip_linkparms;
#endif
if (in6_dev->if_flags & IF_RS_SENT) {
/*
@ -1239,7 +1243,9 @@ skip_defrtr:
}
}
#ifdef CONFIG_IPV6_NDISC_NODETYPE
skip_linkparms:
#endif
/*
* Process options.
@ -1286,9 +1292,11 @@ skip_linkparms:
}
#endif
#ifdef CONFIG_IPV6_NDISC_NODETYPE
/* skip link-specific ndopts from interior routers */
if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
goto out;
#endif
if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
struct nd_opt_hdr *p;
@ -1353,6 +1361,7 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
int optlen;
u8 *lladdr = NULL;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
switch (skb->ndisc_nodetype) {
case NDISC_NODETYPE_HOST:
case NDISC_NODETYPE_NODEFAULT:
@ -1360,6 +1369,7 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
"ICMPv6 Redirect: from host or unauthorized router\n");
return;
}
#endif
if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK2(KERN_WARNING