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net/ipv6/mip6.c
13.2 KB
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/* * Copyright (C)2003-2006 Helsinki University of Technology * Copyright (C)2003-2006 USAGI/WIDE Project * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * Authors: * Noriaki TAKAMIYA @USAGI * Masahide NAKAMURA @USAGI */ |
f32138319 net: ipv6: Standa... |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> #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> #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> #include <net/mip6.h> |
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static inline unsigned int calc_padlen(unsigned int len, unsigned int n) { return (n - len + 16) & 0x7; } static inline void *mip6_padn(__u8 *data, __u8 padlen) { if (!data) return NULL; 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; if (padlen > 2) memset(data+2, 0, data[1]); } return data + padlen; } |
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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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} static int mip6_mh_len(int type) { int len = 0; switch (type) { case IP6_MH_TYPE_BRR: len = 0; break; case IP6_MH_TYPE_HOTI: case IP6_MH_TYPE_COTI: case IP6_MH_TYPE_BU: case IP6_MH_TYPE_BACK: len = 1; break; case IP6_MH_TYPE_HOT: case IP6_MH_TYPE_COT: case IP6_MH_TYPE_BERROR: len = 2; break; } return len; } |
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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; const struct ip6_mh *mh; |
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|
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mh = skb_header_pointer(skb, skb_transport_offset(skb), sizeof(_hdr), &_hdr); if (!mh) |
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return -1; |
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if (((mh->ip6mh_hdrlen + 1) << 3) > skb->len) return -1; |
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if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) { LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d ", mh->ip6mh_hdrlen, mip6_mh_len(mh->ip6mh_type)); |
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mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_hdrlen) + skb_network_header_len(skb)); |
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return -1; } |
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if (mh->ip6mh_proto != IPPROTO_NONE) { LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d ", mh->ip6mh_proto); |
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mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_proto) + skb_network_header_len(skb)); |
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return -1; } return 0; } |
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struct mip6_report_rate_limiter { spinlock_t lock; struct timeval stamp; int iif; struct in6_addr src; struct in6_addr dst; }; 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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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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|
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spin_lock(&x->lock); |
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if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) && !ipv6_addr_any((struct in6_addr *)x->coaddr)) |
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err = -ENOENT; spin_unlock(&x->lock); |
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|
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return err; |
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} /* Destination Option Header is inserted. * IP Header's src address is replaced with Home Address Option in * Destination Option Header. */ static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb) { struct ipv6hdr *iph; struct ipv6_destopt_hdr *dstopt; struct ipv6_destopt_hao *hao; u8 nexthdr; 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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|
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nexthdr = *skb_mac_header(skb); *skb_mac_header(skb) = IPPROTO_DSTOPTS; |
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|
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dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb); |
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dstopt->nexthdr = nexthdr; hao = mip6_padn((char *)(dstopt + 1), calc_padlen(sizeof(*dstopt), 6)); 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); 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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|
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WARN_ON(len != x->props.header_len); |
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dstopt->hdrlen = (x->props.header_len >> 3) - 1; return 0; } |
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static inline int mip6_report_rl_allow(struct timeval *stamp, |
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const struct in6_addr *dst, const struct in6_addr *src, int iif) |
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{ int allow = 0; spin_lock_bh(&mip6_report_rl.lock); if (mip6_report_rl.stamp.tv_sec != stamp->tv_sec || mip6_report_rl.stamp.tv_usec != stamp->tv_usec || mip6_report_rl.iif != iif || !ipv6_addr_equal(&mip6_report_rl.src, src) || !ipv6_addr_equal(&mip6_report_rl.dst, dst)) { mip6_report_rl.stamp.tv_sec = stamp->tv_sec; mip6_report_rl.stamp.tv_usec = stamp->tv_usec; mip6_report_rl.iif = iif; |
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mip6_report_rl.src = *src; mip6_report_rl.dst = *dst; |
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allow = 1; } spin_unlock_bh(&mip6_report_rl.lock); return allow; } |
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static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, 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; struct xfrm_selector sel; int offset; struct timeval stamp; 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)) { offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); if (likely(offset >= 0)) |
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hao = (struct ipv6_destopt_hao *) (skb_network_header(skb) + offset); |
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} skb_get_timestamp(skb, &stamp); |
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if (!mip6_report_rl_allow(&stamp, &ipv6_hdr(skb)->daddr, hao ? &hao->addr : &ipv6_hdr(skb)->saddr, |
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opt->iif)) goto out; 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)); 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)); sel.prefixlen_s = 128; sel.family = AF_INET6; |
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sel.proto = fl6->flowi6_proto; 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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|
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err = km_report(net, IPPROTO_DSTOPTS, &sel, |
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(hao ? (xfrm_address_t *)&hao->addr : NULL)); out: return err; } |
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static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **nexthdr) { u16 offset = sizeof(struct ipv6hdr); |
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struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
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const unsigned char *nh = skb_network_header(skb); |
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unsigned int packet_len = skb->tail - skb->network_header; |
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int found_rhdr = 0; |
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*nexthdr = &ipv6_hdr(skb)->nexthdr; |
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while (offset + 1 <= packet_len) { switch (**nexthdr) { case NEXTHDR_HOP: break; case NEXTHDR_ROUTING: found_rhdr = 1; break; case NEXTHDR_DEST: /* * HAO MUST NOT appear more than once. * XXX: It is better to try to find by the end of * XXX: packet if HAO exists. */ if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) { LIMIT_NETDEBUG(KERN_WARNING "mip6: hao exists already, override "); return offset; } if (found_rhdr) return offset; break; default: return offset; } offset += ipv6_optlen(exthdr); *nexthdr = &exthdr->nexthdr; |
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exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
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} return offset; } static int mip6_destopt_init_state(struct xfrm_state *x) { if (x->id.spi) { |
f32138319 net: ipv6: Standa... |
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pr_info("%s: spi is not 0: %u ", __func__, x->id.spi); |
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return -EINVAL; } if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) { |
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pr_info("%s: state's mode is not %u: %u ", __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode); |
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return -EINVAL; } x->props.header_len = sizeof(struct ipv6_destopt_hdr) + calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) + sizeof(struct ipv6_destopt_hao); |
547b792ca net: convert BUG_... |
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WARN_ON(x->props.header_len != 24); |
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return 0; } /* * Do nothing about destroying since it has no specific operation for * destination options header unlike IPsec protocols. */ static void mip6_destopt_destroy(struct xfrm_state *x) { } |
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static const struct xfrm_type mip6_destopt_type = |
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{ .description = "MIP6DESTOPT", .owner = THIS_MODULE, .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, .destructor = mip6_destopt_destroy, .input = mip6_destopt_input, .output = mip6_destopt_output, |
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.reject = mip6_destopt_reject, |
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.hdr_offset = mip6_destopt_offset, |
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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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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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|
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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; spin_unlock(&x->lock); |
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|
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return err; |
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} /* Routing Header type 2 is inserted. * IP Header's dst address is replaced with Routing Header's Home Address. */ static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb) { struct ipv6hdr *iph; struct rt2_hdr *rt2; u8 nexthdr; |
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skb_push(skb, -skb_network_offset(skb)); |
007f0211a [IPSEC]: Store IP... |
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iph = ipv6_hdr(skb); |
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|
007f0211a [IPSEC]: Store IP... |
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nexthdr = *skb_mac_header(skb); *skb_mac_header(skb) = IPPROTO_ROUTING; |
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|
9c70220b7 [SK_BUFF]: Introd... |
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rt2 = (struct rt2_hdr *)skb_transport_header(skb); |
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rt2->rt_hdr.nexthdr = nexthdr; rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1; rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2; rt2->rt_hdr.segments_left = 1; memset(&rt2->reserved, 0, sizeof(rt2->reserved)); |
547b792ca net: convert BUG_... |
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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; } static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **nexthdr) { u16 offset = sizeof(struct ipv6hdr); |
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struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
d56f90a7c [SK_BUFF]: Introd... |
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const unsigned char *nh = skb_network_header(skb); |
27a884dc3 [SK_BUFF]: Conver... |
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unsigned int packet_len = skb->tail - skb->network_header; |
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int found_rhdr = 0; |
0660e03f6 [SK_BUFF]: Introd... |
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*nexthdr = &ipv6_hdr(skb)->nexthdr; |
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while (offset + 1 <= packet_len) { switch (**nexthdr) { case NEXTHDR_HOP: break; case NEXTHDR_ROUTING: if (offset + 3 <= packet_len) { struct ipv6_rt_hdr *rt; |
d56f90a7c [SK_BUFF]: Introd... |
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rt = (struct ipv6_rt_hdr *)(nh + offset); |
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if (rt->type != 0) return offset; } found_rhdr = 1; break; case NEXTHDR_DEST: if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) return offset; if (found_rhdr) return offset; break; default: return offset; } offset += ipv6_optlen(exthdr); *nexthdr = &exthdr->nexthdr; |
d56f90a7c [SK_BUFF]: Introd... |
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exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
2c8d7ca0f [IPV6] MIP6: Add ... |
425 426 427 428 429 430 431 432 |
} return offset; } static int mip6_rthdr_init_state(struct xfrm_state *x) { if (x->id.spi) { |
f32138319 net: ipv6: Standa... |
433 434 |
pr_info("%s: spi is not 0: %u ", __func__, x->id.spi); |
2c8d7ca0f [IPV6] MIP6: Add ... |
435 436 437 |
return -EINVAL; } if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) { |
f32138319 net: ipv6: Standa... |
438 439 440 |
pr_info("%s: state's mode is not %u: %u ", __func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode); |
2c8d7ca0f [IPV6] MIP6: Add ... |
441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 |
return -EINVAL; } x->props.header_len = sizeof(struct rt2_hdr); return 0; } /* * Do nothing about destroying since it has no specific operation for routing * header type 2 unlike IPsec protocols. */ static void mip6_rthdr_destroy(struct xfrm_state *x) { } |
533cb5b0a [XFRM]: constify ... |
456 |
static const struct xfrm_type mip6_rthdr_type = |
2c8d7ca0f [IPV6] MIP6: Add ... |
457 458 459 460 |
{ .description = "MIP6RT", .owner = THIS_MODULE, .proto = IPPROTO_ROUTING, |
f04e7e8d7 [IPSEC]: Replace ... |
461 |
.flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_REMOTE_COADDR, |
2c8d7ca0f [IPV6] MIP6: Add ... |
462 463 464 465 466 |
.init_state = mip6_rthdr_init_state, .destructor = mip6_rthdr_destroy, .input = mip6_rthdr_input, .output = mip6_rthdr_output, .hdr_offset = mip6_rthdr_offset, |
2c8d7ca0f [IPV6] MIP6: Add ... |
467 |
}; |
59fbb3a61 [IPV6] MIP6: Load... |
468 |
static int __init mip6_init(void) |
2c8d7ca0f [IPV6] MIP6: Add ... |
469 |
{ |
f32138319 net: ipv6: Standa... |
470 471 |
pr_info("Mobile IPv6 "); |
2c8d7ca0f [IPV6] MIP6: Add ... |
472 |
|
3d126890d [IPV6] MIP6: Add ... |
473 |
if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) { |
f32138319 net: ipv6: Standa... |
474 475 |
pr_info("%s: can't add xfrm type(destopt) ", __func__); |
3d126890d [IPV6] MIP6: Add ... |
476 477 |
goto mip6_destopt_xfrm_fail; } |
2c8d7ca0f [IPV6] MIP6: Add ... |
478 |
if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) { |
f32138319 net: ipv6: Standa... |
479 480 |
pr_info("%s: can't add xfrm type(rthdr) ", __func__); |
2c8d7ca0f [IPV6] MIP6: Add ... |
481 482 |
goto mip6_rthdr_xfrm_fail; } |
59fbb3a61 [IPV6] MIP6: Load... |
483 |
if (rawv6_mh_filter_register(mip6_mh_filter) < 0) { |
f32138319 net: ipv6: Standa... |
484 485 |
pr_info("%s: can't add rawv6 mh filter ", __func__); |
59fbb3a61 [IPV6] MIP6: Load... |
486 487 |
goto mip6_rawv6_mh_fail; } |
2c8d7ca0f [IPV6] MIP6: Add ... |
488 |
return 0; |
59fbb3a61 [IPV6] MIP6: Load... |
489 490 |
mip6_rawv6_mh_fail: xfrm_unregister_type(&mip6_rthdr_type, AF_INET6); |
2c8d7ca0f [IPV6] MIP6: Add ... |
491 |
mip6_rthdr_xfrm_fail: |
3d126890d [IPV6] MIP6: Add ... |
492 493 |
xfrm_unregister_type(&mip6_destopt_type, AF_INET6); mip6_destopt_xfrm_fail: |
2c8d7ca0f [IPV6] MIP6: Add ... |
494 495 |
return -EAGAIN; } |
59fbb3a61 [IPV6] MIP6: Load... |
496 |
static void __exit mip6_fini(void) |
2c8d7ca0f [IPV6] MIP6: Add ... |
497 |
{ |
59fbb3a61 [IPV6] MIP6: Load... |
498 |
if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0) |
f32138319 net: ipv6: Standa... |
499 500 |
pr_info("%s: can't remove rawv6 mh filter ", __func__); |
2c8d7ca0f [IPV6] MIP6: Add ... |
501 |
if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0) |
f32138319 net: ipv6: Standa... |
502 503 |
pr_info("%s: can't remove xfrm type(rthdr) ", __func__); |
3d126890d [IPV6] MIP6: Add ... |
504 |
if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0) |
f32138319 net: ipv6: Standa... |
505 506 |
pr_info("%s: can't remove xfrm type(destopt) ", __func__); |
2c8d7ca0f [IPV6] MIP6: Add ... |
507 |
} |
59fbb3a61 [IPV6] MIP6: Load... |
508 509 510 511 512 |
module_init(mip6_init); module_exit(mip6_fini); MODULE_LICENSE("GPL"); |
d3d6dd3ad [XFRM]: Add modul... |
513 514 |
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_DSTOPTS); MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ROUTING); |