![Herbert Xu](/assets/img/avatar_default.png)
When I merged the bundle creation code, I introduced a bogus flowi value in the bundle. Instead of getting from the caller, it was instead set to the flow in the route object, which is totally different. The end result is that the bundles we created never match, and we instead end up with an ever growing bundle list. Thanks to Jamal for find this problem. Reported-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
374 lines
9 KiB
C
374 lines
9 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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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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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,
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xfrm_address_t *saddr,
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xfrm_address_t *daddr)
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{
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struct flowi fl = {};
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struct dst_entry *dst;
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int err;
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memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
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if (saddr)
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memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
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dst = ip6_route_output(net, NULL, &fl);
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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,
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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, 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,
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(struct in6_addr *)&daddr->a6, 0,
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(struct in6_addr *)&saddr->a6);
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dst_release(dst);
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return 0;
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}
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static struct dst_entry *
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__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
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{
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struct dst_entry *dst;
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/* Still not clear if we should set fl->fl6_{src,dst}... */
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read_lock_bh(&policy->lock);
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for (dst = policy->bundles; dst; dst = dst->next) {
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struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
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struct in6_addr fl_dst_prefix, fl_src_prefix;
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ipv6_addr_prefix(&fl_dst_prefix,
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&fl->fl6_dst,
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xdst->u.rt6.rt6i_dst.plen);
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ipv6_addr_prefix(&fl_src_prefix,
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&fl->fl6_src,
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xdst->u.rt6.rt6i_src.plen);
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if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
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ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
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xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
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(xdst->u.rt6.rt6i_dst.plen != 128 ||
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xdst->u.rt6.rt6i_src.plen != 128))) {
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dst_clone(dst);
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break;
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}
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}
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read_unlock_bh(&policy->lock);
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return dst;
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}
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static int xfrm6_get_tos(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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if (rt->rt6i_node)
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path->path_cookie = rt->rt6i_node->fn_sernum;
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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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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(rt->u.dst.dev);
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if (!xdst->u.rt6.rt6i_idev)
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return -ENODEV;
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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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if (rt->rt6i_node)
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xdst->route_cookie = rt->rt6i_node->fn_sernum;
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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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int onlyproto = 0;
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u16 offset = skb_network_header_len(skb);
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struct ipv6hdr *hdr = ipv6_hdr(skb);
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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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u8 nexthdr = nh[IP6CB(skb)->nhoff];
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memset(fl, 0, sizeof(struct flowi));
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ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
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ipv6_addr_copy(&fl->fl6_src, 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 = (__be16 *)exthdr;
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fl->fl_ip_sport = ports[!!reverse];
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fl->fl_ip_dport = ports[!reverse];
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}
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fl->proto = nexthdr;
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return;
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case IPPROTO_ICMPV6:
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if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
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u8 *icmp = (u8 *)exthdr;
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fl->fl_icmp_type = icmp[0];
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fl->fl_icmp_code = icmp[1];
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}
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fl->proto = nexthdr;
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return;
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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case IPPROTO_MH:
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if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
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struct ip6_mh *mh;
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mh = (struct ip6_mh *)exthdr;
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fl->fl_mh_type = mh->ip6mh_type;
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}
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fl->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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fl->fl_ipsec_spi = 0;
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fl->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 (atomic_read(&ops->entries) > ops->gc_thresh * 2);
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}
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static void xfrm6_update_pmtu(struct dst_entry *dst, 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, mtu);
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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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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 = {
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.family = AF_INET6,
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.protocol = cpu_to_be16(ETH_P_IPV6),
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.gc = xfrm6_garbage_collect,
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.update_pmtu = xfrm6_update_pmtu,
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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 = 1024,
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.entries = ATOMIC_INIT(0),
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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,
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.dst_lookup = xfrm6_dst_lookup,
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.get_saddr = xfrm6_get_saddr,
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.find_bundle = __xfrm6_find_bundle,
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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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};
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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 struct ctl_table_header *sysctl_hdr;
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#endif
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int __init xfrm6_init(void)
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{
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int ret;
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unsigned int gc_thresh;
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/*
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* We need a good default value for the xfrm6 gc threshold.
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* In ipv4 we set it to the route hash table size * 8, which
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* is half the size of the maximaum route cache for ipv4. It
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* would be good to do the same thing for v6, except the table is
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* constructed differently here. Here each table for a net namespace
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* can have FIB_TABLE_HASHSZ entries, so lets go with the same
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* computation that we used for ipv4 here. Also, lets keep the initial
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* gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
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* to that as a minimum as well
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*/
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gc_thresh = FIB6_TABLE_HASHSZ * 8;
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xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
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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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#ifdef CONFIG_SYSCTL
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sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
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xfrm6_policy_table);
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#endif
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out:
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return ret;
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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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#ifdef CONFIG_SYSCTL
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if (sysctl_hdr)
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unregister_net_sysctl_table(sysctl_hdr);
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#endif
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//xfrm6_input_fini();
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xfrm6_policy_fini();
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xfrm6_state_fini();
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}
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