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Diffstat (limited to 'net/xfrm/xfrm_policy.c')
-rw-r--r--net/xfrm/xfrm_policy.c153
1 files changed, 145 insertions, 8 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 1b7e75159727..6affe5cd85d8 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -29,6 +29,7 @@
#include <linux/audit.h>
#include <linux/rhashtable.h>
#include <linux/if_tunnel.h>
+#include <linux/icmp.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/inet_ecn.h>
@@ -2694,7 +2695,9 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m)
mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]);
- family = xfrm[i]->props.family;
+ if (xfrm[i]->xso.type != XFRM_DEV_OFFLOAD_PACKET)
+ family = xfrm[i]->props.family;
+
oif = fl->flowi_oif ? : fl->flowi_l3mdev;
dst = xfrm_dst_lookup(xfrm[i], tos, oif,
&saddr, &daddr, family, mark);
@@ -3416,7 +3419,7 @@ decode_session4(const struct xfrm_flow_keys *flkeys, struct flowi *fl, bool reve
}
fl4->flowi4_proto = flkeys->basic.ip_proto;
- fl4->flowi4_tos = flkeys->ip.tos;
+ fl4->flowi4_tos = flkeys->ip.tos & ~INET_ECN_MASK;
}
#if IS_ENABLED(CONFIG_IPV6)
@@ -3503,6 +3506,128 @@ static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int
return 0;
}
+static bool icmp_err_packet(const struct flowi *fl, unsigned short family)
+{
+ const struct flowi4 *fl4 = &fl->u.ip4;
+
+ if (family == AF_INET &&
+ fl4->flowi4_proto == IPPROTO_ICMP &&
+ (fl4->fl4_icmp_type == ICMP_DEST_UNREACH ||
+ fl4->fl4_icmp_type == ICMP_TIME_EXCEEDED))
+ return true;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (family == AF_INET6) {
+ const struct flowi6 *fl6 = &fl->u.ip6;
+
+ if (fl6->flowi6_proto == IPPROTO_ICMPV6 &&
+ (fl6->fl6_icmp_type == ICMPV6_DEST_UNREACH ||
+ fl6->fl6_icmp_type == ICMPV6_PKT_TOOBIG ||
+ fl6->fl6_icmp_type == ICMPV6_TIME_EXCEED))
+ return true;
+ }
+#endif
+ return false;
+}
+
+static bool xfrm_icmp_flow_decode(struct sk_buff *skb, unsigned short family,
+ const struct flowi *fl, struct flowi *fl1)
+{
+ bool ret = true;
+ struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
+ int hl = family == AF_INET ? (sizeof(struct iphdr) + sizeof(struct icmphdr)) :
+ (sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr));
+
+ if (!newskb)
+ return true;
+
+ if (!pskb_pull(newskb, hl))
+ goto out;
+
+ skb_reset_network_header(newskb);
+
+ if (xfrm_decode_session_reverse(dev_net(skb->dev), newskb, fl1, family) < 0)
+ goto out;
+
+ fl1->flowi_oif = fl->flowi_oif;
+ fl1->flowi_mark = fl->flowi_mark;
+ fl1->flowi_tos = fl->flowi_tos;
+ nf_nat_decode_session(newskb, fl1, family);
+ ret = false;
+
+out:
+ consume_skb(newskb);
+ return ret;
+}
+
+static bool xfrm_selector_inner_icmp_match(struct sk_buff *skb, unsigned short family,
+ const struct xfrm_selector *sel,
+ const struct flowi *fl)
+{
+ bool ret = false;
+
+ if (icmp_err_packet(fl, family)) {
+ struct flowi fl1;
+
+ if (xfrm_icmp_flow_decode(skb, family, fl, &fl1))
+ return ret;
+
+ ret = xfrm_selector_match(sel, &fl1, family);
+ }
+
+ return ret;
+}
+
+static inline struct
+xfrm_policy *xfrm_in_fwd_icmp(struct sk_buff *skb,
+ const struct flowi *fl, unsigned short family,
+ u32 if_id)
+{
+ struct xfrm_policy *pol = NULL;
+
+ if (icmp_err_packet(fl, family)) {
+ struct flowi fl1;
+ struct net *net = dev_net(skb->dev);
+
+ if (xfrm_icmp_flow_decode(skb, family, fl, &fl1))
+ return pol;
+
+ pol = xfrm_policy_lookup(net, &fl1, family, XFRM_POLICY_FWD, if_id);
+ }
+
+ return pol;
+}
+
+static inline struct
+dst_entry *xfrm_out_fwd_icmp(struct sk_buff *skb, struct flowi *fl,
+ unsigned short family, struct dst_entry *dst)
+{
+ if (icmp_err_packet(fl, family)) {
+ struct net *net = dev_net(skb->dev);
+ struct dst_entry *dst2;
+ struct flowi fl1;
+
+ if (xfrm_icmp_flow_decode(skb, family, fl, &fl1))
+ return dst;
+
+ dst_hold(dst);
+
+ dst2 = xfrm_lookup(net, dst, &fl1, NULL, (XFRM_LOOKUP_QUEUE | XFRM_LOOKUP_ICMP));
+
+ if (IS_ERR(dst2))
+ return dst;
+
+ if (dst2->xfrm) {
+ dst_release(dst);
+ dst = dst2;
+ } else {
+ dst_release(dst2);
+ }
+ }
+
+ return dst;
+}
+
int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
unsigned short family)
{
@@ -3549,9 +3674,17 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
for (i = sp->len - 1; i >= 0; i--) {
struct xfrm_state *x = sp->xvec[i];
+ int ret = 0;
+
if (!xfrm_selector_match(&x->sel, &fl, family)) {
- XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
- return 0;
+ ret = 1;
+ if (x->props.flags & XFRM_STATE_ICMP &&
+ xfrm_selector_inner_icmp_match(skb, family, &x->sel, &fl))
+ ret = 0;
+ if (ret) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
+ return 0;
+ }
}
}
}
@@ -3574,6 +3707,9 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
return 0;
}
+ if (!pol && dir == XFRM_POLICY_FWD)
+ pol = xfrm_in_fwd_icmp(skb, &fl, family, if_id);
+
if (!pol) {
if (net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
@@ -3707,6 +3843,10 @@ int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
res = 0;
dst = NULL;
}
+
+ if (dst && !dst->xfrm)
+ dst = xfrm_out_fwd_icmp(skb, &fl, family, dst);
+
skb_dst_set(skb, dst);
return res;
}
@@ -4025,10 +4165,7 @@ static int __net_init xfrm_policy_init(struct net *net)
int dir, err;
if (net_eq(net, &init_net)) {
- xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
- sizeof(struct xfrm_dst),
- 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
- NULL);
+ xfrm_dst_cache = KMEM_CACHE(xfrm_dst, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
err = rhashtable_init(&xfrm_policy_inexact_table,
&xfrm_pol_inexact_params);
BUG_ON(err);
generated by cgit v1.2.3-70-g09d2 (git 2.48.1) at 2025-04-26 16:42:01 +0000