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ipv6: Store Router Alert option in IP6CB directly. 

Router Alert option is very small and we can store the value
itself in the skb.

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 / 吉藤英明 2013-01-13 05:02:45 +00:00 committed by David S. Miller
parent 2b464f61f0
commit dd3332bfcb
4 changed files with 8 additions and 5 deletions
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3
include/linux/ipv6.h
View File

@ -84,7 +84,7 @@ static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
struct inet6_skb_parm {
int iif;
__u16 ra;
__be16 ra;
__u16 hop;
__u16 dst0;
__u16 srcrt;
@ -100,6 +100,7 @@ struct inet6_skb_parm {
#define IP6SKB_XFRM_TRANSFORMED 1
#define IP6SKB_FORWARDED 2
#define IP6SKB_REROUTED 4
#define IP6SKB_ROUTERALERT 8
};
#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))

2
include/uapi/linux/ipv6.h
View File

@ -63,6 +63,8 @@ struct ipv6_opt_hdr {
#define ipv6_destopt_hdr ipv6_opt_hdr
#define ipv6_hopopt_hdr ipv6_opt_hdr
/* Router Alert option values (RFC2711) */
#define IPV6_OPT_ROUTERALERT_MLD 0x0000 /* MLD(RFC2710) */
/*
* routing header type 0 (used in cmsghdr struct)

3
net/ipv6/exthdrs.c
View File

@ -553,7 +553,8 @@ static bool ipv6_hop_ra(struct sk_buff *skb, int optoff)
const unsigned char *nh = skb_network_header(skb);
if (nh[optoff + 1] == 2) {
IP6CB(skb)->ra = optoff;
IP6CB(skb)->flags |= IP6SKB_ROUTERALERT;
memcpy(&IP6CB(skb)->ra, nh + optoff + 2, sizeof(IP6CB(skb)->ra));
return true;
}
LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_ra: wrong RA length %d\n",

5
net/ipv6/ip6_input.c
View File

@ -280,9 +280,8 @@ int ip6_mc_input(struct sk_buff *skb)
struct inet6_skb_parm *opt = IP6CB(skb);
/* Check for MLD */
if (unlikely(opt->ra)) {
if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
/* Check if this is a mld message */
u8 *ptr = skb_network_header(skb) + opt->ra;
u8 nexthdr = hdr->nexthdr;
__be16 frag_off;
int offset;
@ -290,7 +289,7 @@ int ip6_mc_input(struct sk_buff *skb)
/* Check if the value of Router Alert
* is for MLD (0x0000).
*/
if ((ptr[2] | ptr[3]) == 0) {
if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) {
deliver = false;
if (!ipv6_ext_hdr(nexthdr)) {