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![David S. Miller](/assets/img/avatar_default.png)
Steffen Klassert says: ==================== pull request (net-next): ipsec-next 2015-10-30 1) The flow cache is limited by the flow cache limit which depends on the number of cpus and the xfrm garbage collector threshold which is independent of the number of cpus. This leads to the fact that on systems with more than 16 cpus we hit the xfrm garbage collector limit and refuse new allocations, so new flows are dropped. On systems with 16 or less cpus, we hit the flowcache limit. In this case, we shrink the flow cache instead of refusing new flows. We increase the xfrm garbage collector threshold to INT_MAX to get the same behaviour, independent of the number of cpus. 2) Fix some unaligned accesses on sparc systems. From Sowmini Varadhan. 3) Fix some header checks in _decode_session4. We may call pskb_may_pull with a negative value converted to unsigened int from pskb_may_pull. This can lead to incorrect policy lookups. We fix this by a check of the data pointer position before we call pskb_may_pull. 4) Reload skb header pointers after calling pskb_may_pull in _decode_session4 as this may change the pointers into the packet. 5) Add a missing statistic counter on inner mode errors. Please pull or let me know if there are problems. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
361 lines
8 KiB
C
361 lines
8 KiB
C
/*
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* xfrm4_policy.c
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*
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* Changes:
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* Kazunori MIYAZAWA @USAGI
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* YOSHIFUJI Hideaki @USAGI
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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/inetdevice.h>
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#include <linux/if_tunnel.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/l3mdev.h>
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static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
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static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
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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 rtable *rt;
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memset(fl4, 0, sizeof(*fl4));
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fl4->daddr = daddr->a4;
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fl4->flowi4_tos = tos;
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fl4->flowi4_oif = oif;
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if (saddr)
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fl4->saddr = saddr->a4;
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fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;
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rt = __ip_route_output_key(net, fl4);
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if (!IS_ERR(rt))
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return &rt->dst;
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return ERR_CAST(rt);
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}
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static struct dst_entry *xfrm4_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 flowi4 fl4;
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return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr);
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}
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static int xfrm4_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 flowi4 fl4;
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dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr);
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if (IS_ERR(dst))
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return -EHOSTUNREACH;
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saddr->a4 = fl4.saddr;
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dst_release(dst);
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return 0;
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}
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static int xfrm4_get_tos(const struct flowi *fl)
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{
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return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
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}
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static int xfrm4_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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return 0;
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}
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static int xfrm4_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 rtable *rt = (struct rtable *)xdst->route;
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const struct flowi4 *fl4 = &fl->u.ip4;
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xdst->u.rt.rt_iif = fl4->flowi4_iif;
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xdst->u.dst.dev = dev;
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dev_hold(dev);
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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.rt.rt_is_input = rt->rt_is_input;
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xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
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RTCF_LOCAL);
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xdst->u.rt.rt_type = rt->rt_type;
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xdst->u.rt.rt_gateway = rt->rt_gateway;
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xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
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xdst->u.rt.rt_pmtu = rt->rt_pmtu;
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xdst->u.rt.rt_table_id = rt->rt_table_id;
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INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
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return 0;
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}
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static void
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_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
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{
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const struct iphdr *iph = ip_hdr(skb);
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u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
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struct flowi4 *fl4 = &fl->u.ip4;
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int oif = 0;
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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(fl4, 0, sizeof(struct flowi4));
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fl4->flowi4_mark = skb->mark;
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fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
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if (!ip_is_fragment(iph)) {
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switch (iph->protocol) {
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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 (xprth + 4 < skb->data ||
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pskb_may_pull(skb, xprth + 4 - skb->data)) {
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__be16 *ports;
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xprth = skb_network_header(skb) + iph->ihl * 4;
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ports = (__be16 *)xprth;
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fl4->fl4_sport = ports[!!reverse];
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fl4->fl4_dport = ports[!reverse];
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}
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break;
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case IPPROTO_ICMP:
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if (xprth + 2 < skb->data ||
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pskb_may_pull(skb, xprth + 2 - skb->data)) {
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u8 *icmp;
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xprth = skb_network_header(skb) + iph->ihl * 4;
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icmp = xprth;
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fl4->fl4_icmp_type = icmp[0];
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fl4->fl4_icmp_code = icmp[1];
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}
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break;
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case IPPROTO_ESP:
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if (xprth + 4 < skb->data ||
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pskb_may_pull(skb, xprth + 4 - skb->data)) {
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__be32 *ehdr;
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xprth = skb_network_header(skb) + iph->ihl * 4;
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ehdr = (__be32 *)xprth;
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fl4->fl4_ipsec_spi = ehdr[0];
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}
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break;
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case IPPROTO_AH:
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if (xprth + 8 < skb->data ||
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pskb_may_pull(skb, xprth + 8 - skb->data)) {
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__be32 *ah_hdr;
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xprth = skb_network_header(skb) + iph->ihl * 4;
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ah_hdr = (__be32 *)xprth;
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fl4->fl4_ipsec_spi = ah_hdr[1];
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}
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break;
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case IPPROTO_COMP:
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if (xprth + 4 < skb->data ||
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pskb_may_pull(skb, xprth + 4 - skb->data)) {
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__be16 *ipcomp_hdr;
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xprth = skb_network_header(skb) + iph->ihl * 4;
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ipcomp_hdr = (__be16 *)xprth;
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fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
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}
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break;
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case IPPROTO_GRE:
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if (xprth + 12 < skb->data ||
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pskb_may_pull(skb, xprth + 12 - skb->data)) {
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__be16 *greflags;
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__be32 *gre_hdr;
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xprth = skb_network_header(skb) + iph->ihl * 4;
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greflags = (__be16 *)xprth;
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gre_hdr = (__be32 *)xprth;
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if (greflags[0] & GRE_KEY) {
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if (greflags[0] & GRE_CSUM)
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gre_hdr++;
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fl4->fl4_gre_key = gre_hdr[1];
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}
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}
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break;
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default:
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fl4->fl4_ipsec_spi = 0;
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break;
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}
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}
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fl4->flowi4_proto = iph->protocol;
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fl4->daddr = reverse ? iph->saddr : iph->daddr;
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fl4->saddr = reverse ? iph->daddr : iph->saddr;
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fl4->flowi4_tos = iph->tos;
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}
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static inline int xfrm4_garbage_collect(struct dst_ops *ops)
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{
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struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
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xfrm4_policy_afinfo.garbage_collect(net);
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return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
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}
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static void xfrm4_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 xfrm4_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 xfrm4_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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dst_destroy_metrics_generic(dst);
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xfrm_dst_destroy(xdst);
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}
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static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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int unregister)
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{
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if (!unregister)
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return;
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xfrm_dst_ifdown(dst, dev);
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}
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static struct dst_ops xfrm4_dst_ops = {
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.family = AF_INET,
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.gc = xfrm4_garbage_collect,
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.update_pmtu = xfrm4_update_pmtu,
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.redirect = xfrm4_redirect,
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.cow_metrics = dst_cow_metrics_generic,
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.destroy = xfrm4_dst_destroy,
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.ifdown = xfrm4_dst_ifdown,
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.local_out = __ip_local_out,
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.gc_thresh = INT_MAX,
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};
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static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
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.family = AF_INET,
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.dst_ops = &xfrm4_dst_ops,
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.dst_lookup = xfrm4_dst_lookup,
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.get_saddr = xfrm4_get_saddr,
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.decode_session = _decode_session4,
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.get_tos = xfrm4_get_tos,
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.init_path = xfrm4_init_path,
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.fill_dst = xfrm4_fill_dst,
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.blackhole_route = ipv4_blackhole_route,
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};
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#ifdef CONFIG_SYSCTL
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static struct ctl_table xfrm4_policy_table[] = {
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{
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.procname = "xfrm4_gc_thresh",
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.data = &init_net.xfrm.xfrm4_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 xfrm4_net_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 = xfrm4_policy_table;
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if (!net_eq(net, &init_net)) {
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table = kmemdup(table, sizeof(xfrm4_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.xfrm4_dst_ops.gc_thresh;
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}
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hdr = register_net_sysctl(net, "net/ipv4", table);
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if (!hdr)
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goto err_reg;
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net->ipv4.xfrm4_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 xfrm4_net_exit(struct net *net)
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{
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struct ctl_table *table;
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if (!net->ipv4.xfrm4_hdr)
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return;
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table = net->ipv4.xfrm4_hdr->ctl_table_arg;
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unregister_net_sysctl_table(net->ipv4.xfrm4_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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static struct pernet_operations __net_initdata xfrm4_net_ops = {
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.init = xfrm4_net_init,
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.exit = xfrm4_net_exit,
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};
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#endif
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static void __init xfrm4_policy_init(void)
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{
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xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
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}
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void __init xfrm4_init(void)
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{
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dst_entries_init(&xfrm4_dst_ops);
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xfrm4_state_init();
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xfrm4_policy_init();
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xfrm4_protocol_init();
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#ifdef CONFIG_SYSCTL
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register_pernet_subsys(&xfrm4_net_ops);
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#endif
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}
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