forked from Minki/linux
40e3012e6e
Steffen Klassert says: ==================== ipsec 2016-09-08 1) Fix a crash when xfrm_dump_sa returns an error. From Vegard Nossum. 2) Remove some incorrect WARN() on normal error handling. From Vegard Nossum. 3) Ignore socket policies when rebuilding hash tables, socket policies are not inserted into the hash tables. From Tobias Brunner. 4) Initialize and check tunnel pointers properly before we use it. From Alexey Kodanev. 5) Fix l3mdev oif setting on xfrm dst lookups. From David Ahern. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
439 lines
9.8 KiB
C
439 lines
9.8 KiB
C
/*
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* xfrm6_policy.c: based on xfrm4_policy.c
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*
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* Authors:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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* YOSHIFUJI Hideaki
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* Split up af-specific portion
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*
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*/
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/addrconf.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <net/l3mdev.h>
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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#include <net/mip6.h>
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#endif
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
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static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
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const xfrm_address_t *saddr,
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const xfrm_address_t *daddr)
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{
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struct flowi6 fl6;
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struct dst_entry *dst;
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int err;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif);
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fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
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memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
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if (saddr)
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memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
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dst = ip6_route_output(net, NULL, &fl6);
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err = dst->error;
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if (dst->error) {
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dst_release(dst);
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dst = ERR_PTR(err);
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}
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return dst;
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}
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static int xfrm6_get_saddr(struct net *net, int oif,
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xfrm_address_t *saddr, xfrm_address_t *daddr)
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{
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struct dst_entry *dst;
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struct net_device *dev;
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dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr);
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if (IS_ERR(dst))
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return -EHOSTUNREACH;
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dev = ip6_dst_idev(dst)->dev;
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ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
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dst_release(dst);
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return 0;
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}
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static int xfrm6_get_tos(const struct flowi *fl)
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{
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return 0;
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}
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static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
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int nfheader_len)
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{
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if (dst->ops->family == AF_INET6) {
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struct rt6_info *rt = (struct rt6_info *)dst;
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path->path_cookie = rt6_get_cookie(rt);
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}
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path->u.rt6.rt6i_nfheader_len = nfheader_len;
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return 0;
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}
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static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
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const struct flowi *fl)
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{
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struct rt6_info *rt = (struct rt6_info *)xdst->route;
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xdst->u.dst.dev = dev;
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dev_hold(dev);
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xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
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if (!xdst->u.rt6.rt6i_idev) {
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dev_put(dev);
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return -ENODEV;
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}
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/* Sheit... I remember I did this right. Apparently,
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* it was magically lost, so this code needs audit */
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xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
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RTF_LOCAL);
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xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
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xdst->u.rt6.rt6i_node = rt->rt6i_node;
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xdst->route_cookie = rt6_get_cookie(rt);
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xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
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xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
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xdst->u.rt6.rt6i_src = rt->rt6i_src;
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return 0;
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}
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static inline void
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_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
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{
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struct flowi6 *fl6 = &fl->u.ip6;
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int onlyproto = 0;
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const struct ipv6hdr *hdr = ipv6_hdr(skb);
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u16 offset = sizeof(*hdr);
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struct ipv6_opt_hdr *exthdr;
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const unsigned char *nh = skb_network_header(skb);
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u16 nhoff = IP6CB(skb)->nhoff;
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int oif = 0;
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u8 nexthdr;
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if (!nhoff)
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nhoff = offsetof(struct ipv6hdr, nexthdr);
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nexthdr = nh[nhoff];
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if (skb_dst(skb))
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oif = l3mdev_fib_oif(skb_dst(skb)->dev);
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memset(fl6, 0, sizeof(struct flowi6));
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fl6->flowi6_mark = skb->mark;
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fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
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fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
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fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
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while (nh + offset + 1 < skb->data ||
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pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
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nh = skb_network_header(skb);
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exthdr = (struct ipv6_opt_hdr *)(nh + offset);
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switch (nexthdr) {
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case NEXTHDR_FRAGMENT:
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onlyproto = 1;
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case NEXTHDR_ROUTING:
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case NEXTHDR_HOP:
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case NEXTHDR_DEST:
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offset += ipv6_optlen(exthdr);
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nexthdr = exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr *)(nh + offset);
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break;
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case IPPROTO_UDP:
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case IPPROTO_UDPLITE:
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case IPPROTO_TCP:
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case IPPROTO_SCTP:
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case IPPROTO_DCCP:
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if (!onlyproto && (nh + offset + 4 < skb->data ||
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pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
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__be16 *ports;
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nh = skb_network_header(skb);
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ports = (__be16 *)(nh + offset);
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fl6->fl6_sport = ports[!!reverse];
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fl6->fl6_dport = ports[!reverse];
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}
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fl6->flowi6_proto = nexthdr;
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return;
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case IPPROTO_ICMPV6:
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if (!onlyproto && (nh + offset + 2 < skb->data ||
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pskb_may_pull(skb, nh + offset + 2 - skb->data))) {
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u8 *icmp;
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nh = skb_network_header(skb);
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icmp = (u8 *)(nh + offset);
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fl6->fl6_icmp_type = icmp[0];
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fl6->fl6_icmp_code = icmp[1];
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}
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fl6->flowi6_proto = nexthdr;
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return;
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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case IPPROTO_MH:
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offset += ipv6_optlen(exthdr);
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if (!onlyproto && (nh + offset + 3 < skb->data ||
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pskb_may_pull(skb, nh + offset + 3 - skb->data))) {
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struct ip6_mh *mh;
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nh = skb_network_header(skb);
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mh = (struct ip6_mh *)(nh + offset);
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fl6->fl6_mh_type = mh->ip6mh_type;
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}
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fl6->flowi6_proto = nexthdr;
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return;
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#endif
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/* XXX Why are there these headers? */
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case IPPROTO_AH:
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case IPPROTO_ESP:
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case IPPROTO_COMP:
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default:
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fl6->fl6_ipsec_spi = 0;
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fl6->flowi6_proto = nexthdr;
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return;
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}
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}
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}
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static inline int xfrm6_garbage_collect(struct dst_ops *ops)
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{
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struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
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xfrm6_policy_afinfo.garbage_collect(net);
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return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
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}
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static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb, u32 mtu)
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{
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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struct dst_entry *path = xdst->route;
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path->ops->update_pmtu(path, sk, skb, mtu);
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}
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static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb)
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{
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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struct dst_entry *path = xdst->route;
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path->ops->redirect(path, sk, skb);
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}
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static void xfrm6_dst_destroy(struct dst_entry *dst)
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{
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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if (likely(xdst->u.rt6.rt6i_idev))
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in6_dev_put(xdst->u.rt6.rt6i_idev);
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dst_destroy_metrics_generic(dst);
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xfrm_dst_destroy(xdst);
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}
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static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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int unregister)
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{
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struct xfrm_dst *xdst;
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if (!unregister)
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return;
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xdst = (struct xfrm_dst *)dst;
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if (xdst->u.rt6.rt6i_idev->dev == dev) {
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struct inet6_dev *loopback_idev =
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in6_dev_get(dev_net(dev)->loopback_dev);
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BUG_ON(!loopback_idev);
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do {
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in6_dev_put(xdst->u.rt6.rt6i_idev);
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xdst->u.rt6.rt6i_idev = loopback_idev;
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in6_dev_hold(loopback_idev);
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xdst = (struct xfrm_dst *)xdst->u.dst.child;
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} while (xdst->u.dst.xfrm);
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__in6_dev_put(loopback_idev);
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}
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xfrm_dst_ifdown(dst, dev);
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}
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static struct dst_ops xfrm6_dst_ops_template = {
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.family = AF_INET6,
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.gc = xfrm6_garbage_collect,
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.update_pmtu = xfrm6_update_pmtu,
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.redirect = xfrm6_redirect,
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.cow_metrics = dst_cow_metrics_generic,
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.destroy = xfrm6_dst_destroy,
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.ifdown = xfrm6_dst_ifdown,
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.local_out = __ip6_local_out,
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.gc_thresh = INT_MAX,
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};
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
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.family = AF_INET6,
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.dst_ops = &xfrm6_dst_ops_template,
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.dst_lookup = xfrm6_dst_lookup,
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.get_saddr = xfrm6_get_saddr,
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.decode_session = _decode_session6,
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.get_tos = xfrm6_get_tos,
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.init_path = xfrm6_init_path,
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.fill_dst = xfrm6_fill_dst,
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.blackhole_route = ip6_blackhole_route,
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};
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static int __init xfrm6_policy_init(void)
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{
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return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
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}
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static void xfrm6_policy_fini(void)
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{
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xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
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}
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#ifdef CONFIG_SYSCTL
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static struct ctl_table xfrm6_policy_table[] = {
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{
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.procname = "xfrm6_gc_thresh",
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.data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{ }
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};
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static int __net_init xfrm6_net_sysctl_init(struct net *net)
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{
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struct ctl_table *table;
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struct ctl_table_header *hdr;
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table = xfrm6_policy_table;
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if (!net_eq(net, &init_net)) {
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table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
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if (!table)
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goto err_alloc;
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table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
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}
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hdr = register_net_sysctl(net, "net/ipv6", table);
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if (!hdr)
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goto err_reg;
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net->ipv6.sysctl.xfrm6_hdr = hdr;
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return 0;
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err_reg:
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if (!net_eq(net, &init_net))
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kfree(table);
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err_alloc:
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return -ENOMEM;
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}
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static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
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{
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struct ctl_table *table;
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if (!net->ipv6.sysctl.xfrm6_hdr)
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return;
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table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
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unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
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if (!net_eq(net, &init_net))
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kfree(table);
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}
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#else /* CONFIG_SYSCTL */
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static inline int xfrm6_net_sysctl_init(struct net *net)
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{
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return 0;
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}
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static inline void xfrm6_net_sysctl_exit(struct net *net)
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{
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}
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#endif
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static int __net_init xfrm6_net_init(struct net *net)
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{
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int ret;
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memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
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sizeof(xfrm6_dst_ops_template));
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ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
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if (ret)
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return ret;
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ret = xfrm6_net_sysctl_init(net);
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if (ret)
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dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
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return ret;
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}
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static void __net_exit xfrm6_net_exit(struct net *net)
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{
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xfrm6_net_sysctl_exit(net);
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dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
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}
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static struct pernet_operations xfrm6_net_ops = {
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.init = xfrm6_net_init,
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.exit = xfrm6_net_exit,
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};
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int __init xfrm6_init(void)
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{
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int ret;
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ret = xfrm6_policy_init();
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if (ret)
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goto out;
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ret = xfrm6_state_init();
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if (ret)
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goto out_policy;
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ret = xfrm6_protocol_init();
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if (ret)
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goto out_state;
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register_pernet_subsys(&xfrm6_net_ops);
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out:
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return ret;
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out_state:
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xfrm6_state_fini();
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out_policy:
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xfrm6_policy_fini();
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goto out;
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}
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void xfrm6_fini(void)
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{
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unregister_pernet_subsys(&xfrm6_net_ops);
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xfrm6_protocol_fini();
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xfrm6_policy_fini();
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xfrm6_state_fini();
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}
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