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[IPV6]: Allow to replace skbuff by TLV parser. 

In receiving Mobile IPv6 home address option which is a TLV carried by
destination options header, kernel will try to mangle source adderss
of packet. Think of cloned skbuff it is required to replace it by the
parser just like routing header case.

This is a framework to achieve that to allow TLV parser to replace
inbound skbuff pointer.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Masahide NAKAMURA 2006-08-23 19:19:50 -07:00 committed by David S. Miller
parent c61a404325
commit a80ff03e05
3 changed files with 21 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/ipv6.h
View File

@ -229,7 +229,7 @@ extern int ip6_ra_control(struct sock *sk, int sel,
void (*destructor)(struct sock *)); void (*destructor)(struct sock *));
extern int ipv6_parse_hopopts(struct sk_buff *skb); extern int ipv6_parse_hopopts(struct sk_buff **skbp);
extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,

29
net/ipv6/exthdrs.c
View File

@ -102,7 +102,7 @@ int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
struct tlvtype_proc { struct tlvtype_proc {
int type; int type;
int (*func)(struct sk_buff *skb, int offset); int (*func)(struct sk_buff **skbp, int offset);
}; };
/********************* /*********************
@ -111,8 +111,10 @@ struct tlvtype_proc {
/* An unknown option is detected, decide what to do */ /* An unknown option is detected, decide what to do */
static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff) static int ip6_tlvopt_unknown(struct sk_buff **skbp, int optoff)
{ {
struct sk_buff *skb = *skbp;
switch ((skb->nh.raw[optoff] & 0xC0) >> 6) { switch ((skb->nh.raw[optoff] & 0xC0) >> 6) {
case 0: /* ignore */ case 0: /* ignore */
return 1; return 1;
@ -137,8 +139,9 @@ static int ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
/* Parse tlv encoded option header (hop-by-hop or destination) */ /* Parse tlv encoded option header (hop-by-hop or destination) */
static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb) static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff **skbp)
{ {
struct sk_buff *skb = *skbp;
struct tlvtype_proc *curr; struct tlvtype_proc *curr;
int off = skb->h.raw - skb->nh.raw; int off = skb->h.raw - skb->nh.raw;
int len = ((skb->h.raw[1]+1)<<3); int len = ((skb->h.raw[1]+1)<<3);
@ -168,13 +171,13 @@ static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff *skb)
/* type specific length/alignment /* type specific length/alignment
checks will be performed in the checks will be performed in the
func(). */ func(). */
if (curr->func(skb, off) == 0) if (curr->func(skbp, off) == 0)
return 0; return 0;
break; break;
} }
} }
if (curr->type < 0) { if (curr->type < 0) {
if (ip6_tlvopt_unknown(skb, off) == 0) if (ip6_tlvopt_unknown(skbp, off) == 0)
return 0; return 0;
} }
break; break;
@ -213,7 +216,8 @@ static int ipv6_destopt_rcv(struct sk_buff **skbp)
opt->lastopt = skb->h.raw - skb->nh.raw; opt->lastopt = skb->h.raw - skb->nh.raw;
opt->dst1 = skb->h.raw - skb->nh.raw; opt->dst1 = skb->h.raw - skb->nh.raw;
if (ip6_parse_tlv(tlvprocdestopt_lst, skb)) { if (ip6_parse_tlv(tlvprocdestopt_lst, skbp)) {
skb = *skbp;
skb->h.raw += ((skb->h.raw[1]+1)<<3); skb->h.raw += ((skb->h.raw[1]+1)<<3);
opt->nhoff = opt->dst1; opt->nhoff = opt->dst1;
return 1; return 1;
@ -517,8 +521,10 @@ EXPORT_SYMBOL_GPL(ipv6_invert_rthdr);
/* Router Alert as of RFC 2711 */ /* Router Alert as of RFC 2711 */
static int ipv6_hop_ra(struct sk_buff *skb, int optoff) static int ipv6_hop_ra(struct sk_buff **skbp, int optoff)
{ {
struct sk_buff *skb = *skbp;
if (skb->nh.raw[optoff+1] == 2) { if (skb->nh.raw[optoff+1] == 2) {
IP6CB(skb)->ra = optoff; IP6CB(skb)->ra = optoff;
return 1; return 1;
@ -531,8 +537,9 @@ static int ipv6_hop_ra(struct sk_buff *skb, int optoff)
/* Jumbo payload */ /* Jumbo payload */
static int ipv6_hop_jumbo(struct sk_buff *skb, int optoff) static int ipv6_hop_jumbo(struct sk_buff **skbp, int optoff)
{ {
struct sk_buff *skb = *skbp;
u32 pkt_len; u32 pkt_len;
if (skb->nh.raw[optoff+1] != 4 || (optoff&3) != 2) { if (skb->nh.raw[optoff+1] != 4 || (optoff&3) != 2) {
@ -581,8 +588,9 @@ static struct tlvtype_proc tlvprochopopt_lst[] = {
{ -1, } { -1, }
}; };
int ipv6_parse_hopopts(struct sk_buff *skb) int ipv6_parse_hopopts(struct sk_buff **skbp)
{ {
struct sk_buff *skb = *skbp;
struct inet6_skb_parm *opt = IP6CB(skb); struct inet6_skb_parm *opt = IP6CB(skb);
/* /*
@ -598,7 +606,8 @@ int ipv6_parse_hopopts(struct sk_buff *skb)
} }
opt->hop = sizeof(struct ipv6hdr); opt->hop = sizeof(struct ipv6hdr);
if (ip6_parse_tlv(tlvprochopopt_lst, skb)) { if (ip6_parse_tlv(tlvprochopopt_lst, skbp)) {
skb = *skbp;
skb->h.raw += (skb->h.raw[1]+1)<<3; skb->h.raw += (skb->h.raw[1]+1)<<3;
opt->nhoff = sizeof(struct ipv6hdr); opt->nhoff = sizeof(struct ipv6hdr);
return 1; return 1;

2
net/ipv6/ip6_input.c
View File

@ -111,7 +111,7 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
} }
if (hdr->nexthdr == NEXTHDR_HOP) { if (hdr->nexthdr == NEXTHDR_HOP) {
if (ipv6_parse_hopopts(skb) < 0) { if (ipv6_parse_hopopts(&skb) < 0) {
IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
return 0; return 0;
} }