| 1 |
3 |
xianfeng |
/*
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| 2 |
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* xfrm6_policy.c: based on xfrm4_policy.c
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| 3 |
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*
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| 4 |
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* Authors:
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| 5 |
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* Mitsuru KANDA @USAGI
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| 6 |
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* Kazunori MIYAZAWA @USAGI
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| 7 |
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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| 8 |
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* IPv6 support
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| 9 |
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* YOSHIFUJI Hideaki
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| 10 |
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* Split up af-specific portion
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*
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*/
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| 13 |
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| 14 |
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#include <linux/compiler.h>
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| 15 |
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#include <linux/netdevice.h>
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| 16 |
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#include <net/addrconf.h>
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| 17 |
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#include <net/xfrm.h>
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| 18 |
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#include <net/ip.h>
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| 19 |
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#include <net/ipv6.h>
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| 20 |
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#include <net/ip6_route.h>
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| 21 |
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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| 22 |
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#include <net/mip6.h>
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| 23 |
|
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#endif
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| 24 |
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| 25 |
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static struct dst_ops xfrm6_dst_ops;
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| 26 |
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
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| 27 |
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| 28 |
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static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
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| 29 |
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{
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| 30 |
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struct dst_entry *dst = ip6_route_output(NULL, fl);
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| 31 |
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int err = dst->error;
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| 32 |
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if (!err)
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| 33 |
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*xdst = (struct xfrm_dst *) dst;
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| 34 |
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else
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| 35 |
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dst_release(dst);
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| 36 |
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return err;
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| 37 |
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}
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| 38 |
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| 39 |
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static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
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| 40 |
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{
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| 41 |
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struct rt6_info *rt;
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| 42 |
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struct flowi fl_tunnel = {
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| 43 |
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.nl_u = {
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| 44 |
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.ip6_u = {
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| 45 |
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.daddr = *(struct in6_addr *)&daddr->a6,
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| 46 |
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},
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| 47 |
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},
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| 48 |
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};
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| 49 |
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| 50 |
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if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
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| 51 |
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ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
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| 52 |
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(struct in6_addr *)&saddr->a6);
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| 53 |
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dst_release(&rt->u.dst);
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| 54 |
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return 0;
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| 55 |
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}
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| 56 |
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return -EHOSTUNREACH;
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| 57 |
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}
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| 58 |
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| 59 |
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static struct dst_entry *
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| 60 |
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__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
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| 61 |
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{
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| 62 |
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struct dst_entry *dst;
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| 63 |
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| 64 |
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/* Still not clear if we should set fl->fl6_{src,dst}... */
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| 65 |
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read_lock_bh(&policy->lock);
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| 66 |
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for (dst = policy->bundles; dst; dst = dst->next) {
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| 67 |
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struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
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| 68 |
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struct in6_addr fl_dst_prefix, fl_src_prefix;
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| 69 |
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| 70 |
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ipv6_addr_prefix(&fl_dst_prefix,
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| 71 |
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&fl->fl6_dst,
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| 72 |
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xdst->u.rt6.rt6i_dst.plen);
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| 73 |
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ipv6_addr_prefix(&fl_src_prefix,
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| 74 |
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&fl->fl6_src,
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| 75 |
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xdst->u.rt6.rt6i_src.plen);
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| 76 |
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if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
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| 77 |
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ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
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| 78 |
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xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
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| 79 |
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(xdst->u.rt6.rt6i_dst.plen != 128 ||
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| 80 |
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xdst->u.rt6.rt6i_src.plen != 128))) {
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| 81 |
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dst_clone(dst);
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| 82 |
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break;
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| 83 |
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}
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| 84 |
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}
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| 85 |
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read_unlock_bh(&policy->lock);
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| 86 |
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return dst;
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| 87 |
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}
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| 88 |
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| 89 |
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static inline struct in6_addr*
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| 90 |
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__xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
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| 91 |
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{
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| 92 |
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return (x->type->remote_addr) ?
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| 93 |
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(struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
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| 94 |
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(struct in6_addr*)&x->id.daddr;
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| 95 |
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}
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| 96 |
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| 97 |
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static inline struct in6_addr*
|
| 98 |
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__xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
|
| 99 |
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{
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| 100 |
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return (x->type->local_addr) ?
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| 101 |
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(struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
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| 102 |
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(struct in6_addr*)&x->props.saddr;
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| 103 |
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}
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| 104 |
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| 105 |
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static inline void
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| 106 |
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__xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x)
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| 107 |
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{
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| 108 |
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if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
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| 109 |
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*nflen += x->props.header_len;
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| 110 |
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else
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| 111 |
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*len += x->props.header_len;
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| 112 |
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}
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| 113 |
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| 114 |
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static inline void
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| 115 |
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__xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x)
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| 116 |
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{
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| 117 |
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if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
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| 118 |
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*nflen -= x->props.header_len;
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| 119 |
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else
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| 120 |
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*len -= x->props.header_len;
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| 121 |
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}
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| 122 |
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| 123 |
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/* Allocate chain of dst_entry's, attach known xfrm's, calculate
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| 124 |
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* all the metrics... Shortly, bundle a bundle.
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| 125 |
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*/
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| 126 |
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| 127 |
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static int
|
| 128 |
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__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
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| 129 |
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struct flowi *fl, struct dst_entry **dst_p)
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| 130 |
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{
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| 131 |
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struct dst_entry *dst, *dst_prev;
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| 132 |
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struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
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| 133 |
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struct rt6_info *rt = rt0;
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| 134 |
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struct flowi fl_tunnel = {
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| 135 |
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.nl_u = {
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| 136 |
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.ip6_u = {
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| 137 |
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.saddr = fl->fl6_src,
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| 138 |
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.daddr = fl->fl6_dst,
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| 139 |
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}
|
| 140 |
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}
|
| 141 |
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};
|
| 142 |
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int i;
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| 143 |
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int err = 0;
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| 144 |
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int header_len = 0;
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| 145 |
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int nfheader_len = 0;
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| 146 |
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int trailer_len = 0;
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| 147 |
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| 148 |
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dst = dst_prev = NULL;
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| 149 |
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dst_hold(&rt->u.dst);
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| 150 |
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| 151 |
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for (i = 0; i < nx; i++) {
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| 152 |
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struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
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| 153 |
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struct xfrm_dst *xdst;
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| 154 |
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| 155 |
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if (unlikely(dst1 == NULL)) {
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| 156 |
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err = -ENOBUFS;
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| 157 |
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dst_release(&rt->u.dst);
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| 158 |
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goto error;
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| 159 |
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}
|
| 160 |
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| 161 |
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if (!dst)
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| 162 |
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dst = dst1;
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| 163 |
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else {
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| 164 |
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dst_prev->child = dst1;
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| 165 |
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dst1->flags |= DST_NOHASH;
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| 166 |
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dst_clone(dst1);
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| 167 |
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}
|
| 168 |
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| 169 |
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xdst = (struct xfrm_dst *)dst1;
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| 170 |
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xdst->route = &rt->u.dst;
|
| 171 |
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xdst->genid = xfrm[i]->genid;
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| 172 |
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if (rt->rt6i_node)
|
| 173 |
|
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xdst->route_cookie = rt->rt6i_node->fn_sernum;
|
| 174 |
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| 175 |
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dst1->next = dst_prev;
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| 176 |
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dst_prev = dst1;
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| 177 |
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| 178 |
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__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
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| 179 |
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trailer_len += xfrm[i]->props.trailer_len;
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| 180 |
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|
| 181 |
|
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if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
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| 182 |
|
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unsigned short encap_family = xfrm[i]->props.family;
|
| 183 |
|
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switch(encap_family) {
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| 184 |
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case AF_INET:
|
| 185 |
|
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fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
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| 186 |
|
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fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
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| 187 |
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break;
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| 188 |
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case AF_INET6:
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| 189 |
|
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ipv6_addr_copy(&fl_tunnel.fl6_dst, __xfrm6_bundle_addr_remote(xfrm[i], &fl->fl6_dst));
|
| 190 |
|
|
|
| 191 |
|
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ipv6_addr_copy(&fl_tunnel.fl6_src, __xfrm6_bundle_addr_local(xfrm[i], &fl->fl6_src));
|
| 192 |
|
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break;
|
| 193 |
|
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default:
|
| 194 |
|
|
BUG_ON(1);
|
| 195 |
|
|
}
|
| 196 |
|
|
|
| 197 |
|
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err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
|
| 198 |
|
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&fl_tunnel, encap_family);
|
| 199 |
|
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if (err)
|
| 200 |
|
|
goto error;
|
| 201 |
|
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} else
|
| 202 |
|
|
dst_hold(&rt->u.dst);
|
| 203 |
|
|
}
|
| 204 |
|
|
|
| 205 |
|
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dst_prev->child = &rt->u.dst;
|
| 206 |
|
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dst->path = &rt->u.dst;
|
| 207 |
|
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if (rt->rt6i_node)
|
| 208 |
|
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((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
|
| 209 |
|
|
|
| 210 |
|
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*dst_p = dst;
|
| 211 |
|
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dst = dst_prev;
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| 212 |
|
|
|
| 213 |
|
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dst_prev = *dst_p;
|
| 214 |
|
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i = 0;
|
| 215 |
|
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for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
|
| 216 |
|
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struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
|
| 217 |
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|
|
| 218 |
|
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dst_prev->xfrm = xfrm[i++];
|
| 219 |
|
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dst_prev->dev = rt->u.dst.dev;
|
| 220 |
|
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if (rt->u.dst.dev)
|
| 221 |
|
|
dev_hold(rt->u.dst.dev);
|
| 222 |
|
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dst_prev->obsolete = -1;
|
| 223 |
|
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dst_prev->flags |= DST_HOST;
|
| 224 |
|
|
dst_prev->lastuse = jiffies;
|
| 225 |
|
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dst_prev->header_len = header_len;
|
| 226 |
|
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dst_prev->nfheader_len = nfheader_len;
|
| 227 |
|
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dst_prev->trailer_len = trailer_len;
|
| 228 |
|
|
memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
|
| 229 |
|
|
|
| 230 |
|
|
/* Copy neighbour for reachability confirmation */
|
| 231 |
|
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dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
|
| 232 |
|
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dst_prev->input = rt->u.dst.input;
|
| 233 |
|
|
dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
|
| 234 |
|
|
/* Sheit... I remember I did this right. Apparently,
|
| 235 |
|
|
* it was magically lost, so this code needs audit */
|
| 236 |
|
|
x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTF_ANYCAST|RTF_LOCAL);
|
| 237 |
|
|
x->u.rt6.rt6i_metric = rt0->rt6i_metric;
|
| 238 |
|
|
x->u.rt6.rt6i_node = rt0->rt6i_node;
|
| 239 |
|
|
x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
|
| 240 |
|
|
memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
|
| 241 |
|
|
x->u.rt6.rt6i_dst = rt0->rt6i_dst;
|
| 242 |
|
|
x->u.rt6.rt6i_src = rt0->rt6i_src;
|
| 243 |
|
|
x->u.rt6.rt6i_idev = rt0->rt6i_idev;
|
| 244 |
|
|
in6_dev_hold(rt0->rt6i_idev);
|
| 245 |
|
|
__xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
|
| 246 |
|
|
trailer_len -= x->u.dst.xfrm->props.trailer_len;
|
| 247 |
|
|
}
|
| 248 |
|
|
|
| 249 |
|
|
xfrm_init_pmtu(dst);
|
| 250 |
|
|
return 0;
|
| 251 |
|
|
|
| 252 |
|
|
error:
|
| 253 |
|
|
if (dst)
|
| 254 |
|
|
dst_free(dst);
|
| 255 |
|
|
return err;
|
| 256 |
|
|
}
|
| 257 |
|
|
|
| 258 |
|
|
static inline void
|
| 259 |
|
|
_decode_session6(struct sk_buff *skb, struct flowi *fl)
|
| 260 |
|
|
{
|
| 261 |
|
|
u16 offset = skb_network_header_len(skb);
|
| 262 |
|
|
struct ipv6hdr *hdr = ipv6_hdr(skb);
|
| 263 |
|
|
struct ipv6_opt_hdr *exthdr;
|
| 264 |
|
|
const unsigned char *nh = skb_network_header(skb);
|
| 265 |
|
|
u8 nexthdr = nh[IP6CB(skb)->nhoff];
|
| 266 |
|
|
|
| 267 |
|
|
memset(fl, 0, sizeof(struct flowi));
|
| 268 |
|
|
ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
|
| 269 |
|
|
ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
|
| 270 |
|
|
|
| 271 |
|
|
while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
|
| 272 |
|
|
nh = skb_network_header(skb);
|
| 273 |
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
| 274 |
|
|
|
| 275 |
|
|
switch (nexthdr) {
|
| 276 |
|
|
case NEXTHDR_ROUTING:
|
| 277 |
|
|
case NEXTHDR_HOP:
|
| 278 |
|
|
case NEXTHDR_DEST:
|
| 279 |
|
|
offset += ipv6_optlen(exthdr);
|
| 280 |
|
|
nexthdr = exthdr->nexthdr;
|
| 281 |
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
| 282 |
|
|
break;
|
| 283 |
|
|
|
| 284 |
|
|
case IPPROTO_UDP:
|
| 285 |
|
|
case IPPROTO_UDPLITE:
|
| 286 |
|
|
case IPPROTO_TCP:
|
| 287 |
|
|
case IPPROTO_SCTP:
|
| 288 |
|
|
case IPPROTO_DCCP:
|
| 289 |
|
|
if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
|
| 290 |
|
|
__be16 *ports = (__be16 *)exthdr;
|
| 291 |
|
|
|
| 292 |
|
|
fl->fl_ip_sport = ports[0];
|
| 293 |
|
|
fl->fl_ip_dport = ports[1];
|
| 294 |
|
|
}
|
| 295 |
|
|
fl->proto = nexthdr;
|
| 296 |
|
|
return;
|
| 297 |
|
|
|
| 298 |
|
|
case IPPROTO_ICMPV6:
|
| 299 |
|
|
if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
|
| 300 |
|
|
u8 *icmp = (u8 *)exthdr;
|
| 301 |
|
|
|
| 302 |
|
|
fl->fl_icmp_type = icmp[0];
|
| 303 |
|
|
fl->fl_icmp_code = icmp[1];
|
| 304 |
|
|
}
|
| 305 |
|
|
fl->proto = nexthdr;
|
| 306 |
|
|
return;
|
| 307 |
|
|
|
| 308 |
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
| 309 |
|
|
case IPPROTO_MH:
|
| 310 |
|
|
if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
|
| 311 |
|
|
struct ip6_mh *mh;
|
| 312 |
|
|
mh = (struct ip6_mh *)exthdr;
|
| 313 |
|
|
|
| 314 |
|
|
fl->fl_mh_type = mh->ip6mh_type;
|
| 315 |
|
|
}
|
| 316 |
|
|
fl->proto = nexthdr;
|
| 317 |
|
|
return;
|
| 318 |
|
|
#endif
|
| 319 |
|
|
|
| 320 |
|
|
/* XXX Why are there these headers? */
|
| 321 |
|
|
case IPPROTO_AH:
|
| 322 |
|
|
case IPPROTO_ESP:
|
| 323 |
|
|
case IPPROTO_COMP:
|
| 324 |
|
|
default:
|
| 325 |
|
|
fl->fl_ipsec_spi = 0;
|
| 326 |
|
|
fl->proto = nexthdr;
|
| 327 |
|
|
return;
|
| 328 |
|
|
}
|
| 329 |
|
|
}
|
| 330 |
|
|
}
|
| 331 |
|
|
|
| 332 |
|
|
static inline int xfrm6_garbage_collect(void)
|
| 333 |
|
|
{
|
| 334 |
|
|
xfrm6_policy_afinfo.garbage_collect();
|
| 335 |
|
|
return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
|
| 336 |
|
|
}
|
| 337 |
|
|
|
| 338 |
|
|
static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
|
| 339 |
|
|
{
|
| 340 |
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
| 341 |
|
|
struct dst_entry *path = xdst->route;
|
| 342 |
|
|
|
| 343 |
|
|
path->ops->update_pmtu(path, mtu);
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
static void xfrm6_dst_destroy(struct dst_entry *dst)
|
| 347 |
|
|
{
|
| 348 |
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
| 349 |
|
|
|
| 350 |
|
|
if (likely(xdst->u.rt6.rt6i_idev))
|
| 351 |
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
| 352 |
|
|
xfrm_dst_destroy(xdst);
|
| 353 |
|
|
}
|
| 354 |
|
|
|
| 355 |
|
|
static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
|
| 356 |
|
|
int unregister)
|
| 357 |
|
|
{
|
| 358 |
|
|
struct xfrm_dst *xdst;
|
| 359 |
|
|
|
| 360 |
|
|
if (!unregister)
|
| 361 |
|
|
return;
|
| 362 |
|
|
|
| 363 |
|
|
xdst = (struct xfrm_dst *)dst;
|
| 364 |
|
|
if (xdst->u.rt6.rt6i_idev->dev == dev) {
|
| 365 |
|
|
struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
|
| 366 |
|
|
BUG_ON(!loopback_idev);
|
| 367 |
|
|
|
| 368 |
|
|
do {
|
| 369 |
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
| 370 |
|
|
xdst->u.rt6.rt6i_idev = loopback_idev;
|
| 371 |
|
|
in6_dev_hold(loopback_idev);
|
| 372 |
|
|
xdst = (struct xfrm_dst *)xdst->u.dst.child;
|
| 373 |
|
|
} while (xdst->u.dst.xfrm);
|
| 374 |
|
|
|
| 375 |
|
|
__in6_dev_put(loopback_idev);
|
| 376 |
|
|
}
|
| 377 |
|
|
|
| 378 |
|
|
xfrm_dst_ifdown(dst, dev);
|
| 379 |
|
|
}
|
| 380 |
|
|
|
| 381 |
|
|
static struct dst_ops xfrm6_dst_ops = {
|
| 382 |
|
|
.family = AF_INET6,
|
| 383 |
|
|
.protocol = __constant_htons(ETH_P_IPV6),
|
| 384 |
|
|
.gc = xfrm6_garbage_collect,
|
| 385 |
|
|
.update_pmtu = xfrm6_update_pmtu,
|
| 386 |
|
|
.destroy = xfrm6_dst_destroy,
|
| 387 |
|
|
.ifdown = xfrm6_dst_ifdown,
|
| 388 |
|
|
.gc_thresh = 1024,
|
| 389 |
|
|
.entry_size = sizeof(struct xfrm_dst),
|
| 390 |
|
|
};
|
| 391 |
|
|
|
| 392 |
|
|
static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
|
| 393 |
|
|
.family = AF_INET6,
|
| 394 |
|
|
.dst_ops = &xfrm6_dst_ops,
|
| 395 |
|
|
.dst_lookup = xfrm6_dst_lookup,
|
| 396 |
|
|
.get_saddr = xfrm6_get_saddr,
|
| 397 |
|
|
.find_bundle = __xfrm6_find_bundle,
|
| 398 |
|
|
.bundle_create = __xfrm6_bundle_create,
|
| 399 |
|
|
.decode_session = _decode_session6,
|
| 400 |
|
|
};
|
| 401 |
|
|
|
| 402 |
|
|
static void __init xfrm6_policy_init(void)
|
| 403 |
|
|
{
|
| 404 |
|
|
xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
|
| 405 |
|
|
}
|
| 406 |
|
|
|
| 407 |
|
|
static void xfrm6_policy_fini(void)
|
| 408 |
|
|
{
|
| 409 |
|
|
xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
|
| 410 |
|
|
}
|
| 411 |
|
|
|
| 412 |
|
|
void __init xfrm6_init(void)
|
| 413 |
|
|
{
|
| 414 |
|
|
xfrm6_policy_init();
|
| 415 |
|
|
xfrm6_state_init();
|
| 416 |
|
|
}
|
| 417 |
|
|
|
| 418 |
|
|
void xfrm6_fini(void)
|
| 419 |
|
|
{
|
| 420 |
|
|
//xfrm6_input_fini();
|
| 421 |
|
|
xfrm6_policy_fini();
|
| 422 |
|
|
xfrm6_state_fini();
|
| 423 |
|
|
}
|
