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412 lines
10 KiB
412 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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/* |
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/skbuff.h> |
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#include <linux/time.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/rawv6.h> |
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#include <net/xfrm.h> |
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#include <net/mip6.h> |
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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] = IPV6_TLV_PAD1; |
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} else if (padlen > 1) { |
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data[0] = IPV6_TLV_PADN; |
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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, u8 code, int pos) |
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{ |
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icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos); |
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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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static int mip6_mh_filter(struct sock *sk, struct sk_buff *skb) |
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{ |
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struct ip6_mh _hdr; |
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const struct ip6_mh *mh; |
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mh = skb_header_pointer(skb, skb_transport_offset(skb), |
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sizeof(_hdr), &_hdr); |
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if (!mh) |
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return -1; |
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if (((mh->ip6mh_hdrlen + 1) << 3) > skb->len) |
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return -1; |
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if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) { |
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net_dbg_ratelimited("mip6: MH message too short: %d vs >=%d\n", |
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mh->ip6mh_hdrlen, |
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mip6_mh_len(mh->ip6mh_type)); |
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mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_hdrlen) + |
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skb_network_header_len(skb)); |
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return -1; |
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} |
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if (mh->ip6mh_proto != IPPROTO_NONE) { |
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net_dbg_ratelimited("mip6: MH invalid payload proto = %d\n", |
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mh->ip6mh_proto); |
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mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_proto) + |
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skb_network_header_len(skb)); |
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return -1; |
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} |
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return 0; |
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} |
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struct mip6_report_rate_limiter { |
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spinlock_t lock; |
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ktime_t stamp; |
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int iif; |
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struct in6_addr src; |
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struct in6_addr dst; |
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}; |
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static struct mip6_report_rate_limiter mip6_report_rl = { |
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.lock = __SPIN_LOCK_UNLOCKED(mip6_report_rl.lock) |
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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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const struct ipv6hdr *iph = ipv6_hdr(skb); |
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struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data; |
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int err = destopt->nexthdr; |
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spin_lock(&x->lock); |
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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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err = -ENOENT; |
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spin_unlock(&x->lock); |
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return err; |
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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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skb_push(skb, -skb_network_offset(skb)); |
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iph = ipv6_hdr(skb); |
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nexthdr = *skb_mac_header(skb); |
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*skb_mac_header(skb) = IPPROTO_DSTOPTS; |
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dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb); |
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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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BUILD_BUG_ON(sizeof(*hao) != 18); |
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hao->length = sizeof(*hao) - 2; |
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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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spin_lock_bh(&x->lock); |
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memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr)); |
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spin_unlock_bh(&x->lock); |
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WARN_ON(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 inline int mip6_report_rl_allow(ktime_t stamp, |
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const struct in6_addr *dst, |
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const struct in6_addr *src, int iif) |
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{ |
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int allow = 0; |
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spin_lock_bh(&mip6_report_rl.lock); |
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if (mip6_report_rl.stamp != stamp || |
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mip6_report_rl.iif != iif || |
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!ipv6_addr_equal(&mip6_report_rl.src, src) || |
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!ipv6_addr_equal(&mip6_report_rl.dst, dst)) { |
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mip6_report_rl.stamp = stamp; |
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mip6_report_rl.iif = iif; |
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mip6_report_rl.src = *src; |
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mip6_report_rl.dst = *dst; |
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allow = 1; |
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} |
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spin_unlock_bh(&mip6_report_rl.lock); |
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return allow; |
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} |
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static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, |
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const struct flowi *fl) |
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{ |
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struct net *net = xs_net(x); |
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struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb; |
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const struct flowi6 *fl6 = &fl->u.ip6; |
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struct ipv6_destopt_hao *hao = NULL; |
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struct xfrm_selector sel; |
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int offset; |
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ktime_t stamp; |
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int err = 0; |
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if (unlikely(fl6->flowi6_proto == IPPROTO_MH && |
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fl6->fl6_mh_type <= IP6_MH_TYPE_MAX)) |
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goto out; |
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if (likely(opt->dsthao)) { |
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offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); |
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if (likely(offset >= 0)) |
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hao = (struct ipv6_destopt_hao *) |
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(skb_network_header(skb) + offset); |
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} |
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stamp = skb_get_ktime(skb); |
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if (!mip6_report_rl_allow(stamp, &ipv6_hdr(skb)->daddr, |
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hao ? &hao->addr : &ipv6_hdr(skb)->saddr, |
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opt->iif)) |
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goto out; |
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memset(&sel, 0, sizeof(sel)); |
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memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr, |
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sizeof(sel.daddr)); |
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sel.prefixlen_d = 128; |
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memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr, |
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sizeof(sel.saddr)); |
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sel.prefixlen_s = 128; |
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sel.family = AF_INET6; |
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sel.proto = fl6->flowi6_proto; |
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sel.dport = xfrm_flowi_dport(fl, &fl6->uli); |
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if (sel.dport) |
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sel.dport_mask = htons(~0); |
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sel.sport = xfrm_flowi_sport(fl, &fl6->uli); |
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if (sel.sport) |
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sel.sport_mask = htons(~0); |
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sel.ifindex = fl6->flowi6_oif; |
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err = km_report(net, IPPROTO_DSTOPTS, &sel, |
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(hao ? (xfrm_address_t *)&hao->addr : NULL)); |
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out: |
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return err; |
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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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pr_info("%s: spi is not 0: %u\n", __func__, 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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pr_info("%s: state's mode is not %u: %u\n", |
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__func__, 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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WARN_ON(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 const struct xfrm_type mip6_destopt_type = { |
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.owner = THIS_MODULE, |
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.proto = IPPROTO_DSTOPTS, |
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.flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_LOCAL_COADDR, |
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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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.reject = mip6_destopt_reject, |
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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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const struct ipv6hdr *iph = ipv6_hdr(skb); |
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struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data; |
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int err = rt2->rt_hdr.nexthdr; |
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spin_lock(&x->lock); |
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if (!ipv6_addr_equal(&iph->daddr, (struct in6_addr *)x->coaddr) && |
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!ipv6_addr_any((struct in6_addr *)x->coaddr)) |
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err = -ENOENT; |
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spin_unlock(&x->lock); |
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return err; |
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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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skb_push(skb, -skb_network_offset(skb)); |
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iph = ipv6_hdr(skb); |
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nexthdr = *skb_mac_header(skb); |
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*skb_mac_header(skb) = IPPROTO_ROUTING; |
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rt2 = (struct rt2_hdr *)skb_transport_header(skb); |
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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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WARN_ON(rt2->rt_hdr.hdrlen != 2); |
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memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr)); |
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spin_lock_bh(&x->lock); |
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memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr)); |
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spin_unlock_bh(&x->lock); |
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return 0; |
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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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pr_info("%s: spi is not 0: %u\n", __func__, 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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pr_info("%s: state's mode is not %u: %u\n", |
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__func__, 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 const struct xfrm_type mip6_rthdr_type = { |
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.owner = THIS_MODULE, |
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.proto = IPPROTO_ROUTING, |
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.flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_REMOTE_COADDR, |
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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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}; |
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static int __init mip6_init(void) |
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{ |
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pr_info("Mobile IPv6\n"); |
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if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) { |
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pr_info("%s: can't add xfrm type(destopt)\n", __func__); |
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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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pr_info("%s: can't add xfrm type(rthdr)\n", __func__); |
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goto mip6_rthdr_xfrm_fail; |
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} |
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if (rawv6_mh_filter_register(mip6_mh_filter) < 0) { |
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pr_info("%s: can't add rawv6 mh filter\n", __func__); |
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goto mip6_rawv6_mh_fail; |
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} |
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return 0; |
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mip6_rawv6_mh_fail: |
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xfrm_unregister_type(&mip6_rthdr_type, AF_INET6); |
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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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static void __exit mip6_fini(void) |
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{ |
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if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0) |
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pr_info("%s: can't remove rawv6 mh filter\n", __func__); |
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xfrm_unregister_type(&mip6_rthdr_type, AF_INET6); |
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xfrm_unregister_type(&mip6_destopt_type, AF_INET6); |
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} |
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module_init(mip6_init); |
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module_exit(mip6_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_DSTOPTS); |
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MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ROUTING);
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