diff options
Diffstat (limited to 'net/ipv6/ah6.c')
| -rw-r--r-- | net/ipv6/ah6.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c index 6c0aa51319a..0f2b4e330aa 100644 --- a/net/ipv6/ah6.c +++ b/net/ipv6/ah6.c @@ -74,6 +74,68 @@ bad: return 0; } +#ifdef CONFIG_IPV6_MIP6 +/** + * ipv6_rearrange_destopt - rearrange IPv6 destination options header + * @iph: IPv6 header + * @destopt: destionation options header + */ +static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) +{ + u8 *opt = (u8 *)destopt; + int len = ipv6_optlen(destopt); + int off = 0; + int optlen = 0; + + off += 2; + len -= 2; + + while (len > 0) { + + switch (opt[off]) { + + case IPV6_TLV_PAD0: + optlen = 1; + break; + default: + if (len < 2) + goto bad; + optlen = opt[off+1]+2; + if (len < optlen) + goto bad; + + /* Rearrange the source address in @iph and the + * addresses in home address option for final source. + * See 11.3.2 of RFC 3775 for details. + */ + if (opt[off] == IPV6_TLV_HAO) { + struct in6_addr final_addr; + struct ipv6_destopt_hao *hao; + + hao = (struct ipv6_destopt_hao *)&opt[off]; + if (hao->length != sizeof(hao->addr)) { + if (net_ratelimit()) + printk(KERN_WARNING "destopt hao: invalid header length: %u\n", hao->length); + goto bad; + } + ipv6_addr_copy(&final_addr, &hao->addr); + ipv6_addr_copy(&hao->addr, &iph->saddr); + ipv6_addr_copy(&iph->saddr, &final_addr); + } + break; + } + + off += optlen; + len -= optlen; + } + if (len == 0) + return; + +bad: + return; +} +#endif + /** * ipv6_rearrange_rthdr - rearrange IPv6 routing header * @iph: IPv6 header @@ -113,7 +175,11 @@ static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr) ipv6_addr_copy(&iph->daddr, &final_addr); } +#ifdef CONFIG_IPV6_MIP6 +static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir) +#else static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len) +#endif { union { struct ipv6hdr *iph; @@ -128,6 +194,28 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len) while (exthdr.raw < end) { switch (nexthdr) { +#ifdef CONFIG_IPV6_MIP6 + case NEXTHDR_HOP: + if (!zero_out_mutable_opts(exthdr.opth)) { + LIMIT_NETDEBUG( + KERN_WARNING "overrun %sopts\n", + nexthdr == NEXTHDR_HOP ? + "hop" : "dest"); + return -EINVAL; + } + break; + case NEXTHDR_DEST: + if (dir == XFRM_POLICY_OUT) + ipv6_rearrange_destopt(iph, exthdr.opth); + if (!zero_out_mutable_opts(exthdr.opth)) { + LIMIT_NETDEBUG( + KERN_WARNING "overrun %sopts\n", + nexthdr == NEXTHDR_HOP ? + "hop" : "dest"); + return -EINVAL; + } + break; +#else case NEXTHDR_HOP: case NEXTHDR_DEST: if (!zero_out_mutable_opts(exthdr.opth)) { @@ -138,6 +226,7 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len) return -EINVAL; } break; +#endif case NEXTHDR_ROUTING: ipv6_rearrange_rthdr(iph, exthdr.rth); @@ -164,6 +253,9 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) u8 nexthdr; char tmp_base[8]; struct { +#ifdef CONFIG_IPV6_MIP6 + struct in6_addr saddr; +#endif struct in6_addr daddr; char hdrs[0]; } *tmp_ext; @@ -188,10 +280,18 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) err = -ENOMEM; goto error; } +#ifdef CONFIG_IPV6_MIP6 + memcpy(tmp_ext, &top_iph->saddr, extlen); + err = ipv6_clear_mutable_options(top_iph, + extlen - sizeof(*tmp_ext) + + sizeof(*top_iph), + XFRM_POLICY_OUT); +#else memcpy(tmp_ext, &top_iph->daddr, extlen); err = ipv6_clear_mutable_options(top_iph, extlen - sizeof(*tmp_ext) + sizeof(*top_iph)); +#endif if (err) goto error_free_iph; } @@ -222,7 +322,11 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) memcpy(top_iph, tmp_base, sizeof(tmp_base)); if (tmp_ext) { +#ifdef CONFIG_IPV6_MIP6 + memcpy(&top_iph->saddr, tmp_ext, extlen); +#else memcpy(&top_iph->daddr, tmp_ext, extlen); +#endif error_free_iph: kfree(tmp_ext); } @@ -282,8 +386,13 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) if (!tmp_hdr) goto out; memcpy(tmp_hdr, skb->nh.raw, hdr_len); +#ifdef CONFIG_IPV6_MIP6 + if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len, XFRM_POLICY_IN)) + goto free_out; +#else if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len)) goto free_out; +#endif skb->nh.ipv6h->priority = 0; skb->nh.ipv6h->flow_lbl[0] = 0; skb->nh.ipv6h->flow_lbl[1] = 0; |