From a80ff03e05e4343d647780c116b02ec86078fd24 Mon Sep 17 00:00:00 2001 From: Masahide NAKAMURA Date: Wed, 23 Aug 2006 19:19:50 -0700 Subject: [PATCH] [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 Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- include/net/ipv6.h | 2 +- net/ipv6/exthdrs.c | 29 +++++++++++++++++++---------- net/ipv6/ip6_input.c | 2 +- 3 files changed, 21 insertions(+), 12 deletions(-) diff --git a/include/net/ipv6.h b/include/net/ipv6.h index c4ea127105..8e6ec6063f 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -229,7 +229,7 @@ extern int ip6_ra_control(struct sock *sk, int sel, 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_renew_options(struct sock *sk, struct ipv6_txoptions *opt, diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 50ff49e518..1cdd0f0b5d 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -102,7 +102,7 @@ int ipv6_find_tlv(struct sk_buff *skb, int offset, int type) struct tlvtype_proc { 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 */ -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) { case 0: /* ignore */ 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) */ -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; int off = skb->h.raw - skb->nh.raw; 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 checks will be performed in the func(). */ - if (curr->func(skb, off) == 0) + if (curr->func(skbp, off) == 0) return 0; break; } } if (curr->type < 0) { - if (ip6_tlvopt_unknown(skb, off) == 0) + if (ip6_tlvopt_unknown(skbp, off) == 0) return 0; } break; @@ -213,7 +216,8 @@ static int ipv6_destopt_rcv(struct sk_buff **skbp) opt->lastopt = 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); opt->nhoff = opt->dst1; return 1; @@ -517,8 +521,10 @@ EXPORT_SYMBOL_GPL(ipv6_invert_rthdr); /* 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) { IP6CB(skb)->ra = optoff; return 1; @@ -531,8 +537,9 @@ static int ipv6_hop_ra(struct sk_buff *skb, int optoff) /* 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; if (skb->nh.raw[optoff+1] != 4 || (optoff&3) != 2) { @@ -581,8 +588,9 @@ static struct tlvtype_proc tlvprochopopt_lst[] = { { -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); /* @@ -598,7 +606,8 @@ int ipv6_parse_hopopts(struct sk_buff *skb) } 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; opt->nhoff = sizeof(struct ipv6hdr); return 1; diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index 25c2a9e038..6b8e6d76a5 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -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 (ipv6_parse_hopopts(skb) < 0) { + if (ipv6_parse_hopopts(&skb) < 0) { IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS); return 0; } -- 2.39.5