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Diffstat (limited to 'net/ipv6/ip6mr.c')
-rw-r--r--net/ipv6/ip6mr.c157
1 files changed, 142 insertions, 15 deletions
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 9db31e5b998c..e047a4680ab0 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -2035,8 +2035,8 @@ static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct
* Processing handlers for ip6mr_forward
*/
-static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
- struct sk_buff *skb, int vifi)
+static int ip6mr_prepare_xmit(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, int vifi)
{
struct vif_device *vif = &mrt->vif_table[vifi];
struct net_device *vif_dev;
@@ -2046,7 +2046,7 @@ static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
vif_dev = vif_dev_read(vif);
if (!vif_dev)
- goto out_free;
+ return -1;
#ifdef CONFIG_IPV6_PIMSM_V2
if (vif->flags & MIFF_REGISTER) {
@@ -2055,7 +2055,7 @@ static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
DEV_STATS_INC(vif_dev, tx_packets);
ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
- goto out_free;
+ return -1;
}
#endif
@@ -2069,7 +2069,7 @@ static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
dst = ip6_route_output(net, NULL, &fl6);
if (dst->error) {
dst_release(dst);
- goto out_free;
+ return -1;
}
skb_dst_drop(skb);
@@ -2093,20 +2093,43 @@ static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
/* We are about to write */
/* XXX: extension headers? */
if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(vif_dev)))
- goto out_free;
+ return -1;
ipv6h = ipv6_hdr(skb);
ipv6h->hop_limit--;
+ return 0;
+}
+
+static void ip6mr_forward2(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, int vifi)
+{
+ struct net_device *indev = skb->dev;
+
+ if (ip6mr_prepare_xmit(net, mrt, skb, vifi))
+ goto out_free;
IP6CB(skb)->flags |= IP6SKB_FORWARDED;
- return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
- net, NULL, skb, skb->dev, vif_dev,
- ip6mr_forward2_finish);
+ NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
+ net, NULL, skb, indev, skb->dev,
+ ip6mr_forward2_finish);
+ return;
+
+out_free:
+ kfree_skb(skb);
+}
+
+static void ip6mr_output2(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, int vifi)
+{
+ if (ip6mr_prepare_xmit(net, mrt, skb, vifi))
+ goto out_free;
+
+ ip6_output(net, NULL, skb);
+ return;
out_free:
kfree_skb(skb);
- return 0;
}
/* Called with rcu_read_lock() */
@@ -2221,6 +2244,56 @@ dont_forward:
kfree_skb(skb);
}
+/* Called under rcu_read_lock() */
+static void ip6_mr_output_finish(struct net *net, struct mr_table *mrt,
+ struct net_device *dev, struct sk_buff *skb,
+ struct mfc6_cache *c)
+{
+ int psend = -1;
+ int ct;
+
+ WARN_ON_ONCE(!rcu_read_lock_held());
+
+ atomic_long_inc(&c->_c.mfc_un.res.pkt);
+ atomic_long_add(skb->len, &c->_c.mfc_un.res.bytes);
+ WRITE_ONCE(c->_c.mfc_un.res.lastuse, jiffies);
+
+ /* Forward the frame */
+ if (ipv6_addr_any(&c->mf6c_origin) &&
+ ipv6_addr_any(&c->mf6c_mcastgrp)) {
+ if (ipv6_hdr(skb)->hop_limit >
+ c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
+ /* It's an (*,*) entry and the packet is not coming from
+ * the upstream: forward the packet to the upstream
+ * only.
+ */
+ psend = c->_c.mfc_parent;
+ goto last_forward;
+ }
+ goto dont_forward;
+ }
+ for (ct = c->_c.mfc_un.res.maxvif - 1;
+ ct >= c->_c.mfc_un.res.minvif; ct--) {
+ if (ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
+ if (psend != -1) {
+ struct sk_buff *skb2;
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (skb2)
+ ip6mr_output2(net, mrt, skb2, psend);
+ }
+ psend = ct;
+ }
+ }
+last_forward:
+ if (psend != -1) {
+ ip6mr_output2(net, mrt, skb, psend);
+ return;
+ }
+
+dont_forward:
+ kfree_skb(skb);
+}
/*
* Multicast packets for forwarding arrive here
@@ -2228,21 +2301,20 @@ dont_forward:
int ip6_mr_input(struct sk_buff *skb)
{
+ struct net_device *dev = skb->dev;
+ struct net *net = dev_net_rcu(dev);
struct mfc6_cache *cache;
- struct net *net = dev_net(skb->dev);
struct mr_table *mrt;
struct flowi6 fl6 = {
- .flowi6_iif = skb->dev->ifindex,
+ .flowi6_iif = dev->ifindex,
.flowi6_mark = skb->mark,
};
int err;
- struct net_device *dev;
/* skb->dev passed in is the master dev for vrfs.
* Get the proper interface that does have a vif associated with it.
*/
- dev = skb->dev;
- if (netif_is_l3_master(skb->dev)) {
+ if (netif_is_l3_master(dev)) {
dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
if (!dev) {
kfree_skb(skb);
@@ -2288,6 +2360,61 @@ int ip6_mr_input(struct sk_buff *skb)
return 0;
}
+int ip6_mr_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct net_device *dev = skb_dst(skb)->dev;
+ struct flowi6 fl6 = (struct flowi6) {
+ .flowi6_iif = LOOPBACK_IFINDEX,
+ .flowi6_mark = skb->mark,
+ };
+ struct mfc6_cache *cache;
+ struct mr_table *mrt;
+ int err;
+ int vif;
+
+ guard(rcu)();
+
+ if (IP6CB(skb)->flags & IP6SKB_FORWARDED)
+ goto ip6_output;
+ if (!(IP6CB(skb)->flags & IP6SKB_MCROUTE))
+ goto ip6_output;
+
+ err = ip6mr_fib_lookup(net, &fl6, &mrt);
+ if (err < 0) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ cache = ip6mr_cache_find(mrt,
+ &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
+ if (!cache) {
+ vif = ip6mr_find_vif(mrt, dev);
+ if (vif >= 0)
+ cache = ip6mr_cache_find_any(mrt,
+ &ipv6_hdr(skb)->daddr,
+ vif);
+ }
+
+ /* No usable cache entry */
+ if (!cache) {
+ vif = ip6mr_find_vif(mrt, dev);
+ if (vif >= 0)
+ return ip6mr_cache_unresolved(mrt, vif, skb, dev);
+ goto ip6_output;
+ }
+
+ /* Wrong interface */
+ vif = cache->_c.mfc_parent;
+ if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev)
+ goto ip6_output;
+
+ ip6_mr_output_finish(net, mrt, dev, skb, cache);
+ return 0;
+
+ip6_output:
+ return ip6_output(net, sk, skb);
+}
+
int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
u32 portid)
{
generated by cgit (git 2.34.1) at 2025-07-31 20:34:31 +0000