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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv6/xfrm6_policy.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/ipv6/xfrm6_policy.c')
-rw-r--r-- | net/ipv6/xfrm6_policy.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c new file mode 100644 index 000000000000..8a4f37de4d2d --- /dev/null +++ b/net/ipv6/xfrm6_policy.c @@ -0,0 +1,295 @@ +/* + * xfrm6_policy.c: based on xfrm4_policy.c + * + * Authors: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro <kunihiro@ipinfusion.com> + * IPv6 support + * YOSHIFUJI Hideaki + * Split up af-specific portion + * + */ + +#include <linux/config.h> +#include <net/xfrm.h> +#include <net/ip.h> +#include <net/ipv6.h> +#include <net/ip6_route.h> + +static struct dst_ops xfrm6_dst_ops; +static struct xfrm_policy_afinfo xfrm6_policy_afinfo; + +static struct xfrm_type_map xfrm6_type_map = { .lock = RW_LOCK_UNLOCKED }; + +static int xfrm6_dst_lookup(struct xfrm_dst **dst, struct flowi *fl) +{ + int err = 0; + *dst = (struct xfrm_dst*)ip6_route_output(NULL, fl); + if (!*dst) + err = -ENETUNREACH; + return err; +} + +static struct dst_entry * +__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy) +{ + struct dst_entry *dst; + + /* Still not clear if we should set fl->fl6_{src,dst}... */ + read_lock_bh(&policy->lock); + for (dst = policy->bundles; dst; dst = dst->next) { + struct xfrm_dst *xdst = (struct xfrm_dst*)dst; + struct in6_addr fl_dst_prefix, fl_src_prefix; + + ipv6_addr_prefix(&fl_dst_prefix, + &fl->fl6_dst, + xdst->u.rt6.rt6i_dst.plen); + ipv6_addr_prefix(&fl_src_prefix, + &fl->fl6_src, + xdst->u.rt6.rt6i_src.plen); + if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) && + ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) && + xfrm_bundle_ok(xdst, fl, AF_INET6)) { + dst_clone(dst); + break; + } + } + read_unlock_bh(&policy->lock); + return dst; +} + +/* Allocate chain of dst_entry's, attach known xfrm's, calculate + * all the metrics... Shortly, bundle a bundle. + */ + +static int +__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, + struct flowi *fl, struct dst_entry **dst_p) +{ + struct dst_entry *dst, *dst_prev; + struct rt6_info *rt0 = (struct rt6_info*)(*dst_p); + struct rt6_info *rt = rt0; + struct in6_addr *remote = &fl->fl6_dst; + struct in6_addr *local = &fl->fl6_src; + struct flowi fl_tunnel = { + .nl_u = { + .ip6_u = { + .saddr = *local, + .daddr = *remote + } + } + }; + int i; + int err = 0; + int header_len = 0; + int trailer_len = 0; + + dst = dst_prev = NULL; + dst_hold(&rt->u.dst); + + for (i = 0; i < nx; i++) { + struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops); + struct xfrm_dst *xdst; + int tunnel = 0; + + if (unlikely(dst1 == NULL)) { + err = -ENOBUFS; + dst_release(&rt->u.dst); + goto error; + } + + if (!dst) + dst = dst1; + else { + dst_prev->child = dst1; + dst1->flags |= DST_NOHASH; + dst_clone(dst1); + } + + xdst = (struct xfrm_dst *)dst1; + xdst->route = &rt->u.dst; + + dst1->next = dst_prev; + dst_prev = dst1; + if (xfrm[i]->props.mode) { + remote = (struct in6_addr*)&xfrm[i]->id.daddr; + local = (struct in6_addr*)&xfrm[i]->props.saddr; + tunnel = 1; + } + header_len += xfrm[i]->props.header_len; + trailer_len += xfrm[i]->props.trailer_len; + + if (tunnel) { + ipv6_addr_copy(&fl_tunnel.fl6_dst, remote); + ipv6_addr_copy(&fl_tunnel.fl6_src, local); + err = xfrm_dst_lookup((struct xfrm_dst **) &rt, + &fl_tunnel, AF_INET6); + if (err) + goto error; + } else + dst_hold(&rt->u.dst); + } + + dst_prev->child = &rt->u.dst; + dst->path = &rt->u.dst; + + *dst_p = dst; + dst = dst_prev; + + dst_prev = *dst_p; + i = 0; + for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) { + struct xfrm_dst *x = (struct xfrm_dst*)dst_prev; + + dst_prev->xfrm = xfrm[i++]; + dst_prev->dev = rt->u.dst.dev; + if (rt->u.dst.dev) + dev_hold(rt->u.dst.dev); + dst_prev->obsolete = -1; + dst_prev->flags |= DST_HOST; + dst_prev->lastuse = jiffies; + dst_prev->header_len = header_len; + dst_prev->trailer_len = trailer_len; + memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics)); + + /* Copy neighbour for reachability confirmation */ + dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour); + dst_prev->input = rt->u.dst.input; + dst_prev->output = xfrm6_output; + /* Sheit... I remember I did this right. Apparently, + * it was magically lost, so this code needs audit */ + x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL); + x->u.rt6.rt6i_metric = rt0->rt6i_metric; + x->u.rt6.rt6i_node = rt0->rt6i_node; + x->u.rt6.rt6i_gateway = rt0->rt6i_gateway; + memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway)); + x->u.rt6.rt6i_dst = rt0->rt6i_dst; + x->u.rt6.rt6i_src = rt0->rt6i_src; + header_len -= x->u.dst.xfrm->props.header_len; + trailer_len -= x->u.dst.xfrm->props.trailer_len; + } + + xfrm_init_pmtu(dst); + return 0; + +error: + if (dst) + dst_free(dst); + return err; +} + +static inline void +_decode_session6(struct sk_buff *skb, struct flowi *fl) +{ + u16 offset = sizeof(struct ipv6hdr); + struct ipv6hdr *hdr = skb->nh.ipv6h; + struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); + u8 nexthdr = skb->nh.ipv6h->nexthdr; + + memset(fl, 0, sizeof(struct flowi)); + ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr); + ipv6_addr_copy(&fl->fl6_src, &hdr->saddr); + + while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) { + switch (nexthdr) { + case NEXTHDR_ROUTING: + case NEXTHDR_HOP: + case NEXTHDR_DEST: + offset += ipv6_optlen(exthdr); + nexthdr = exthdr->nexthdr; + exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); + break; + + case IPPROTO_UDP: + case IPPROTO_TCP: + case IPPROTO_SCTP: + if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) { + u16 *ports = (u16 *)exthdr; + + fl->fl_ip_sport = ports[0]; + fl->fl_ip_dport = ports[1]; + } + fl->proto = nexthdr; + return; + + case IPPROTO_ICMPV6: + if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) { + u8 *icmp = (u8 *)exthdr; + + fl->fl_icmp_type = icmp[0]; + fl->fl_icmp_code = icmp[1]; + } + fl->proto = nexthdr; + return; + + /* XXX Why are there these headers? */ + case IPPROTO_AH: + case IPPROTO_ESP: + case IPPROTO_COMP: + default: + fl->fl_ipsec_spi = 0; + fl->proto = nexthdr; + return; + }; + } +} + +static inline int xfrm6_garbage_collect(void) +{ + read_lock(&xfrm6_policy_afinfo.lock); + xfrm6_policy_afinfo.garbage_collect(); + read_unlock(&xfrm6_policy_afinfo.lock); + return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2); +} + +static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu) +{ + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + struct dst_entry *path = xdst->route; + + path->ops->update_pmtu(path, mtu); +} + +static struct dst_ops xfrm6_dst_ops = { + .family = AF_INET6, + .protocol = __constant_htons(ETH_P_IPV6), + .gc = xfrm6_garbage_collect, + .update_pmtu = xfrm6_update_pmtu, + .gc_thresh = 1024, + .entry_size = sizeof(struct xfrm_dst), +}; + +static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { + .family = AF_INET6, + .lock = RW_LOCK_UNLOCKED, + .type_map = &xfrm6_type_map, + .dst_ops = &xfrm6_dst_ops, + .dst_lookup = xfrm6_dst_lookup, + .find_bundle = __xfrm6_find_bundle, + .bundle_create = __xfrm6_bundle_create, + .decode_session = _decode_session6, +}; + +static void __init xfrm6_policy_init(void) +{ + xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); +} + +static void xfrm6_policy_fini(void) +{ + xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); +} + +void __init xfrm6_init(void) +{ + xfrm6_policy_init(); + xfrm6_state_init(); +} + +void xfrm6_fini(void) +{ + //xfrm6_input_fini(); + xfrm6_policy_fini(); + xfrm6_state_fini(); +} |