7be96f7628
Like ICMPv6, mobility header is handled through raw socket. In inbound case, check only whether ICMPv6 error should be sent as a reply or not by kernel. Based on MIPL2 kernel patch. This patch was also written by: Ville Nuorvala <vnuorval@tcs.hut.fi> This patch was also written by: Antti Tuominen <anttit@tcs.hut.fi> 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>
432 lines
11 KiB
C
432 lines
11 KiB
C
/*
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* Copyright (C)2003-2006 Helsinki University of Technology
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* Copyright (C)2003-2006 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Authors:
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* Noriaki TAKAMIYA @USAGI
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* Masahide NAKAMURA @USAGI
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#include <net/sock.h>
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#include <net/ipv6.h>
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#include <net/ip6_checksum.h>
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#include <net/xfrm.h>
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#include <net/mip6.h>
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static xfrm_address_t *mip6_xfrm_addr(struct xfrm_state *x, xfrm_address_t *addr)
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{
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return x->coaddr;
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}
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static inline unsigned int calc_padlen(unsigned int len, unsigned int n)
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{
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return (n - len + 16) & 0x7;
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}
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static inline void *mip6_padn(__u8 *data, __u8 padlen)
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{
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if (!data)
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return NULL;
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if (padlen == 1) {
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data[0] = MIP6_OPT_PAD_1;
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} else if (padlen > 1) {
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data[0] = MIP6_OPT_PAD_N;
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data[1] = padlen - 2;
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if (padlen > 2)
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memset(data+2, 0, data[1]);
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}
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return data + padlen;
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}
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static inline void mip6_param_prob(struct sk_buff *skb, int code, int pos)
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{
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icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
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}
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static int mip6_mh_len(int type)
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{
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int len = 0;
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switch (type) {
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case IP6_MH_TYPE_BRR:
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len = 0;
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break;
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case IP6_MH_TYPE_HOTI:
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case IP6_MH_TYPE_COTI:
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case IP6_MH_TYPE_BU:
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case IP6_MH_TYPE_BACK:
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len = 1;
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break;
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case IP6_MH_TYPE_HOT:
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case IP6_MH_TYPE_COT:
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case IP6_MH_TYPE_BERROR:
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len = 2;
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break;
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}
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return len;
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}
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int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
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{
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struct ip6_mh *mh;
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int mhlen;
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if (!pskb_may_pull(skb, (skb->h.raw - skb->data) + 8) ||
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!pskb_may_pull(skb, (skb->h.raw - skb->data) + ((skb->h.raw[1] + 1) << 3)))
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return -1;
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mh = (struct ip6_mh *)skb->h.raw;
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if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
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LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d\n",
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mh->ip6mh_hdrlen, mip6_mh_len(mh->ip6mh_type));
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mip6_param_prob(skb, 0, (&mh->ip6mh_hdrlen) - skb->nh.raw);
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return -1;
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}
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mhlen = (mh->ip6mh_hdrlen + 1) << 3;
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if (skb->ip_summed == CHECKSUM_COMPLETE) {
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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if (csum_ipv6_magic(&skb->nh.ipv6h->saddr,
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&skb->nh.ipv6h->daddr,
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mhlen, IPPROTO_MH,
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skb->csum)) {
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LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH hw checksum failed\n");
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skb->ip_summed = CHECKSUM_NONE;
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}
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}
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if (skb->ip_summed == CHECKSUM_NONE) {
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if (csum_ipv6_magic(&skb->nh.ipv6h->saddr,
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&skb->nh.ipv6h->daddr,
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mhlen, IPPROTO_MH,
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skb_checksum(skb, 0, mhlen, 0))) {
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LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n",
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NIP6(skb->nh.ipv6h->saddr),
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NIP6(skb->nh.ipv6h->daddr));
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return -1;
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}
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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}
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if (mh->ip6mh_proto != IPPROTO_NONE) {
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LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d\n",
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mh->ip6mh_proto);
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mip6_param_prob(skb, 0, (&mh->ip6mh_proto) - skb->nh.raw);
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return -1;
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}
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return 0;
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}
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static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *iph = skb->nh.ipv6h;
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struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
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if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
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!ipv6_addr_any((struct in6_addr *)x->coaddr))
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return -ENOENT;
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return destopt->nexthdr;
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}
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/* Destination Option Header is inserted.
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* IP Header's src address is replaced with Home Address Option in
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* Destination Option Header.
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*/
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static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *iph;
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struct ipv6_destopt_hdr *dstopt;
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struct ipv6_destopt_hao *hao;
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u8 nexthdr;
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int len;
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iph = (struct ipv6hdr *)skb->data;
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iph->payload_len = htons(skb->len - sizeof(*iph));
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nexthdr = *skb->nh.raw;
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*skb->nh.raw = IPPROTO_DSTOPTS;
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dstopt = (struct ipv6_destopt_hdr *)skb->h.raw;
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dstopt->nexthdr = nexthdr;
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hao = mip6_padn((char *)(dstopt + 1),
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calc_padlen(sizeof(*dstopt), 6));
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hao->type = IPV6_TLV_HAO;
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hao->length = sizeof(*hao) - 2;
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BUG_TRAP(hao->length == 16);
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len = ((char *)hao - (char *)dstopt) + sizeof(*hao);
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memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
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memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
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BUG_TRAP(len == x->props.header_len);
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dstopt->hdrlen = (x->props.header_len >> 3) - 1;
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return 0;
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}
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static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
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u8 **nexthdr)
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{
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u16 offset = sizeof(struct ipv6hdr);
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struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
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unsigned int packet_len = skb->tail - skb->nh.raw;
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int found_rhdr = 0;
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*nexthdr = &skb->nh.ipv6h->nexthdr;
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while (offset + 1 <= packet_len) {
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switch (**nexthdr) {
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case NEXTHDR_HOP:
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break;
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case NEXTHDR_ROUTING:
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found_rhdr = 1;
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break;
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case NEXTHDR_DEST:
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/*
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* HAO MUST NOT appear more than once.
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* XXX: It is better to try to find by the end of
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* XXX: packet if HAO exists.
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*/
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if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
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LIMIT_NETDEBUG(KERN_WARNING "mip6: hao exists already, override\n");
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return offset;
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}
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if (found_rhdr)
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return offset;
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break;
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default:
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return offset;
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}
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offset += ipv6_optlen(exthdr);
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*nexthdr = &exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
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}
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return offset;
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}
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static int mip6_destopt_init_state(struct xfrm_state *x)
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{
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if (x->id.spi) {
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printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__,
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x->id.spi);
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return -EINVAL;
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}
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if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
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printk(KERN_INFO "%s: state's mode is not %u: %u\n",
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__FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
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return -EINVAL;
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}
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x->props.header_len = sizeof(struct ipv6_destopt_hdr) +
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calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
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sizeof(struct ipv6_destopt_hao);
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BUG_TRAP(x->props.header_len == 24);
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return 0;
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}
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/*
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* Do nothing about destroying since it has no specific operation for
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* destination options header unlike IPsec protocols.
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*/
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static void mip6_destopt_destroy(struct xfrm_state *x)
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{
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}
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static struct xfrm_type mip6_destopt_type =
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{
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.description = "MIP6DESTOPT",
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.owner = THIS_MODULE,
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.proto = IPPROTO_DSTOPTS,
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.flags = XFRM_TYPE_NON_FRAGMENT,
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.init_state = mip6_destopt_init_state,
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.destructor = mip6_destopt_destroy,
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.input = mip6_destopt_input,
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.output = mip6_destopt_output,
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.hdr_offset = mip6_destopt_offset,
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.local_addr = mip6_xfrm_addr,
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};
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static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
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if (!ipv6_addr_equal(&rt2->addr, (struct in6_addr *)x->coaddr) &&
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!ipv6_addr_any((struct in6_addr *)x->coaddr))
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return -ENOENT;
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return rt2->rt_hdr.nexthdr;
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}
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/* Routing Header type 2 is inserted.
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* IP Header's dst address is replaced with Routing Header's Home Address.
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*/
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static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *iph;
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struct rt2_hdr *rt2;
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u8 nexthdr;
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iph = (struct ipv6hdr *)skb->data;
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iph->payload_len = htons(skb->len - sizeof(*iph));
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nexthdr = *skb->nh.raw;
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*skb->nh.raw = IPPROTO_ROUTING;
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rt2 = (struct rt2_hdr *)skb->h.raw;
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rt2->rt_hdr.nexthdr = nexthdr;
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rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
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rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
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rt2->rt_hdr.segments_left = 1;
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memset(&rt2->reserved, 0, sizeof(rt2->reserved));
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BUG_TRAP(rt2->rt_hdr.hdrlen == 2);
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memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
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memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
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return 0;
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}
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static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
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u8 **nexthdr)
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{
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u16 offset = sizeof(struct ipv6hdr);
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struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
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unsigned int packet_len = skb->tail - skb->nh.raw;
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int found_rhdr = 0;
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*nexthdr = &skb->nh.ipv6h->nexthdr;
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while (offset + 1 <= packet_len) {
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switch (**nexthdr) {
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case NEXTHDR_HOP:
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break;
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case NEXTHDR_ROUTING:
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if (offset + 3 <= packet_len) {
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struct ipv6_rt_hdr *rt;
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rt = (struct ipv6_rt_hdr *)(skb->nh.raw + offset);
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if (rt->type != 0)
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return offset;
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}
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found_rhdr = 1;
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break;
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case NEXTHDR_DEST:
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if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
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return offset;
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if (found_rhdr)
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return offset;
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break;
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default:
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return offset;
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}
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offset += ipv6_optlen(exthdr);
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*nexthdr = &exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
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}
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return offset;
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}
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static int mip6_rthdr_init_state(struct xfrm_state *x)
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{
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if (x->id.spi) {
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printk(KERN_INFO "%s: spi is not 0: %u\n", __FUNCTION__,
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x->id.spi);
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return -EINVAL;
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}
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if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
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printk(KERN_INFO "%s: state's mode is not %u: %u\n",
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__FUNCTION__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
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return -EINVAL;
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}
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x->props.header_len = sizeof(struct rt2_hdr);
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return 0;
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}
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/*
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* Do nothing about destroying since it has no specific operation for routing
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* header type 2 unlike IPsec protocols.
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*/
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static void mip6_rthdr_destroy(struct xfrm_state *x)
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{
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}
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static struct xfrm_type mip6_rthdr_type =
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{
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.description = "MIP6RT",
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.owner = THIS_MODULE,
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.proto = IPPROTO_ROUTING,
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.flags = XFRM_TYPE_NON_FRAGMENT,
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.init_state = mip6_rthdr_init_state,
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.destructor = mip6_rthdr_destroy,
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.input = mip6_rthdr_input,
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.output = mip6_rthdr_output,
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.hdr_offset = mip6_rthdr_offset,
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.remote_addr = mip6_xfrm_addr,
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};
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int __init mip6_init(void)
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{
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printk(KERN_INFO "Mobile IPv6\n");
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if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) {
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printk(KERN_INFO "%s: can't add xfrm type(destopt)\n", __FUNCTION__);
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goto mip6_destopt_xfrm_fail;
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}
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if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
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printk(KERN_INFO "%s: can't add xfrm type(rthdr)\n", __FUNCTION__);
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goto mip6_rthdr_xfrm_fail;
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}
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return 0;
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mip6_rthdr_xfrm_fail:
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xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
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mip6_destopt_xfrm_fail:
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return -EAGAIN;
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}
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void __exit mip6_fini(void)
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{
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if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
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printk(KERN_INFO "%s: can't remove xfrm type(rthdr)\n", __FUNCTION__);
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if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
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printk(KERN_INFO "%s: can't remove xfrm type(destopt)\n", __FUNCTION__);
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}
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