On 19/10/15 02:20, Roopa Prabhu wrote:
@@ -159,6 +137,7 @@ static int mpls_forward(struct sk_buff *skb, struct
net_device *dev,
struct net *net = dev_net(dev);
struct mpls_shim_hdr *hdr;
struct mpls_route *rt;
+ struct mpls_nh *nh;
struct mpls_entry_decoded dec;
struct net_device *out_dev;
struct mpls_dev *mdev;
@@ -166,6 +145,7 @@ static int mpls_forward(struct sk_buff *skb, struct
net_device *dev,
unsigned int new_header_size;
unsigned int mtu;
int err;
+ int nhidx;
nhidx looks to be unused. Remove?
/* Careful this entire function runs inside of an rcu critical section
*/
@@ -196,8 +176,12 @@ static int mpls_forward(struct sk_buff *skb, struct
net_device *dev,
if (!rt)
goto drop;
+ nh = mpls_select_multipath(rt);
+ if (!nh)
+ goto drop;
+
/* Find the output device */
- out_dev = rcu_dereference(rt->rt_dev);
+ out_dev = rcu_dereference(nh->nh_dev);
if (!mpls_output_possible(out_dev))
goto drop;
@@ -212,7 +196,7 @@ static int mpls_forward(struct sk_buff *skb, struct
net_device *dev,
dec.ttl -= 1;
/* Verify the destination can hold the packet */
- new_header_size = mpls_rt_header_size(rt);
+ new_header_size = mpls_nh_header_size(nh);
mtu = mpls_dev_mtu(out_dev);
if (mpls_pkt_too_big(skb, mtu - new_header_size))
goto drop;
@@ -240,13 +224,14 @@ static int mpls_forward(struct sk_buff *skb, struct
net_device *dev,
/* Push the new labels */
hdr = mpls_hdr(skb);
bos = dec.bos;
- for (i = rt->rt_labels - 1; i >= 0; i--) {
- hdr[i] = mpls_entry_encode(rt->rt_label[i], dec.ttl, 0,
bos);
+ for (i = nh->nh_labels - 1; i >= 0; i--) {
+ hdr[i] = mpls_entry_encode(nh->nh_label[i],
+ dec.ttl, 0, bos);
bos = false;
}
}
- err = neigh_xmit(rt->rt_via_table, out_dev, rt->rt_via, skb);
+ err = neigh_xmit(nh->nh_via_table, out_dev, nh->nh_via, skb);
if (err)
net_dbg_ratelimited("%s: packet transmission failed: %d\n",
__func__, err);
return dev;
}
+static int mpls_nh_assign_dev(struct net *net, struct mpls_nh *nh, int oif)
+{
+ struct net_device *dev = NULL;
+ int err = -ENODEV;
+
+ dev = find_outdev(net, nh, oif);
+ if (IS_ERR(dev)) {
+ err = PTR_ERR(dev);
+ dev = NULL;
+ goto errout;
+ }
+
+ /* Ensure this is a supported device */
+ err = -EINVAL;
+ if (!mpls_dev_get(dev))
+ goto errout;
+
+ /* For now just support ethernet devices */
+ if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
+ goto errout;
+
+ RCU_INIT_POINTER(nh->nh_dev, dev);
+ dev_put(dev);
If it's safe to not keep a reference to dev (i.e. because the device
cannot go away while a netlink message is being processed), then why not
just change find_outdev to use __dev_get_by_index? If the dev can go
away during this, then we could end up adding an mpls route that points
to a freed interface, because until we've added the route to the label
table mpls_ifdown won't find it.
+
+ return 0;
+
+errout:
+ if (dev)
+ dev_put(dev);
+ return err;
+}
+
}
EXPORT_SYMBOL_GPL(nla_get_labels);
+int nla_get_via(const struct nlattr *nla, u8 *via_alen,
+ u8 *via_table, u8 via_addr[])
+{
+ struct rtvia *via = nla_data(nla);
+ int err = -EINVAL;
+ u8 alen;
This should be an int to avoid nexthop address lengths > 255 wrapping
and possibly accepted instead of rejected.
+
+ if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr))
+ goto errout;
+ alen = nla_len(nla) -
+ offsetof(struct rtvia, rtvia_addr);
+ if (alen > MAX_VIA_ALEN)
+ goto errout;
+
+ /* Validate the address family */
+ switch(via->rtvia_family) {
+ case AF_PACKET:
+ *via_table = NEIGH_LINK_TABLE;
+ break;
+ case AF_INET:
+ *via_table = NEIGH_ARP_TABLE;
+ if (alen != 4)
+ goto errout;
+ break;
+ case AF_INET6:
+ *via_table = NEIGH_ND_TABLE;
+ if (alen != 16)
+ goto errout;
+ break;
+ default:
+ /* Unsupported address family */
+ goto errout;
+ }
+
+ memcpy(via_addr, via->rtvia_addr, alen);
+ *via_alen = alen;
+ err = 0;
+
+errout:
+ return err;
+}
+
static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
struct mpls_route_config *cfg)
{
Otherwise, looks good.
Thanks,
Rob
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