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Message-Id: <201403181521.s2IFL99N027716@lab1.dls>
Date: Tue, 18 Mar 2014 11:21:09 -0400
From: David L Stevens <dlstevens@...ibm.com>
To: David Miller <davem@...emloft.net>,
Stephen Hemminger <shemminger@...tta.com>,
Cong Wang <amwang@...hat.com>
cc: netdev@...r.kernel.org
Subject: [PATCHv2 net-next] VXLAN: fix nonfunctional neigh_reduce
The VXLAN neigh_reduce() code is completely non-functional since
check-in. Specific errors:
1) The original code drops all packets with a multicast destination address,
even though neighbor solicitations are sent to the solicited-node
address, a multicast address. The code after this check was never run.
2) The neighbor table lookup used the IPv6 header destination, which is the
solicited node address, rather than the target address from the
neighbor solicitation. So neighbor lookups would always fail if it
got this far. Also for L3MISSes.
3) The code calls ndisc_send_na(), which does a send on the tunnel device.
The context for neigh_reduce() is the transmit path, vxlan_xmit(),
where the host or a bridge-attached neighbor is trying to transmit
a neighbor solicitation. To respond to it, the tunnel endpoint needs
to do a *receive* of the appropriate neighbor advertisement. Doing a
send, would only try to send the advertisement, encapsulated, to the
remote destinations in the fdb -- hosts that definitely did not do the
corresponding solicitation.
4) The code uses the tunnel endpoint IPv6 forwarding flag to determine the
isrouter flag in the advertisement. This has nothing to do with whether
or not the target is a router, and generally won't be set since the
tunnel endpoint is bridging, not routing, traffic.
The patch below creates a proxy neighbor advertisement to respond to
neighbor solicitions as intended, providing proper IPv6 support for neighbor
reduction.
Changes since v1:
- reworked code to be structurally similar to arp_reduce()
Signed-Off-By: David L Stevens <dlstevens@...ibm.com>
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index eb59b14..e319c6d 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1336,14 +1336,106 @@ out:
}
#if IS_ENABLED(CONFIG_IPV6)
+
+static struct sk_buff *vxlan_na_create(struct sk_buff *request,
+ struct neighbour *n, bool isrouter)
+{
+ struct net_device *dev = request->dev;
+ struct sk_buff *reply = NULL;
+ struct nd_msg *ns, *na;
+ struct ipv6hdr *pip6 = ipv6_hdr(reply);
+ u8 *daddr;
+ int olen = 8; /* opt hdr + ETH_ALEN for target */
+ int i, len;
+
+ if (dev == NULL)
+ return NULL;
+
+ ns = (struct nd_msg *)skb_transport_header(request);
+
+ len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
+ sizeof(*na) + olen + dev->needed_tailroom;
+ reply = alloc_skb(len, GFP_ATOMIC);
+ if (reply == NULL)
+ goto out;
+
+ reply->protocol = htons(ETH_P_IPV6);
+ reply->dev = dev;
+ skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
+ skb_push(reply, sizeof(struct ethhdr));
+ skb_set_mac_header(reply, 0);
+
+ daddr = eth_hdr(request)->h_source;
+ olen = request->len - skb_transport_offset(request) - sizeof(*ns);
+ for (i = 0; i < olen-1; i += (ns->opt[i+1]<<3)) {
+ if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
+ daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
+ break;
+ }
+ }
+
+ /* Ethernet header */
+ memcpy(eth_hdr(reply)->h_dest, daddr, ETH_ALEN);
+ memcpy(eth_hdr(reply)->h_source, n->ha, ETH_ALEN);
+ eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
+ reply->protocol = htons(ETH_P_IPV6);
+
+ skb_pull(reply, sizeof(struct ethhdr));
+ skb_set_network_header(reply, 0);
+ skb_put(reply, sizeof(struct ipv6hdr));
+
+ /* IPv6 header */
+
+ pip6 = ipv6_hdr(reply);
+ memset(pip6, 0, sizeof(struct ipv6hdr));
+ pip6->version = 6;
+ pip6->priority = ipv6_hdr(request)->priority;
+ pip6->nexthdr = IPPROTO_ICMPV6;
+ pip6->hop_limit = 255;
+ pip6->daddr = ipv6_hdr(request)->saddr;
+ pip6->saddr = *(struct in6_addr *)n->primary_key;
+
+ skb_pull(reply, sizeof(struct ipv6hdr));
+ skb_set_transport_header(reply, 0);
+
+ olen = 8; /* ND_OPT_TARGET_LL_ADDR */
+ na = (struct nd_msg *)skb_put(reply, sizeof(*na) + olen);
+
+ /* Neighbor Advertisement */
+ memset(na, 0, sizeof(*na)+olen);
+ na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
+ na->icmph.icmp6_router = isrouter;
+ na->icmph.icmp6_override = 1;
+ na->icmph.icmp6_solicited = 1;
+ na->target = ns->target;
+ memcpy(&na->opt[2], n->ha, ETH_ALEN);
+ na->opt[0] = ND_OPT_TARGET_LL_ADDR;
+ na->opt[1] = 1; /* 8 bytes */
+
+ na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
+ &pip6->daddr, sizeof(*na)+olen, IPPROTO_ICMPV6,
+ csum_partial(na, sizeof(*na)+olen, 0));
+
+ pip6->payload_len = htons(sizeof(*na)+olen);
+
+ skb_push(reply, sizeof(struct ipv6hdr));
+
+ reply->ip_summed = CHECKSUM_UNNECESSARY;
+
+ return reply;
+out:
+ if (reply)
+ kfree_skb(reply);
+ return 0;
+}
+
static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
- struct neighbour *n;
- union vxlan_addr ipa;
+ struct nd_msg *msg;
const struct ipv6hdr *iphdr;
const struct in6_addr *saddr, *daddr;
- struct nd_msg *msg;
+ struct neighbour *n;
struct inet6_dev *in6_dev = NULL;
in6_dev = __in6_dev_get(dev);
@@ -1357,8 +1449,7 @@ static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
saddr = &iphdr->saddr;
daddr = &iphdr->daddr;
- if (ipv6_addr_loopback(daddr) ||
- ipv6_addr_is_multicast(daddr))
+ if (ipv6_addr_loopback(daddr))
goto out;
msg = (struct nd_msg *)skb_transport_header(skb);
@@ -1366,10 +1457,11 @@ static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
goto out;
- n = neigh_lookup(ipv6_stub->nd_tbl, daddr, dev);
+ n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
if (n) {
struct vxlan_fdb *f;
+ struct sk_buff *reply;
if (!(n->nud_state & NUD_CONNECTED)) {
neigh_release(n);
@@ -1383,13 +1475,23 @@ static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
goto out;
}
- ipv6_stub->ndisc_send_na(dev, n, saddr, &msg->target,
- !!in6_dev->cnf.forwarding,
- true, false, false);
+ reply = vxlan_na_create(skb, n,
+ !!(f ? f->flags & NTF_ROUTER : 0));
+
neigh_release(n);
+
+ if (reply == NULL)
+ goto out;
+
+ if (netif_rx_ni(reply) == NET_RX_DROP)
+ dev->stats.rx_dropped++;
+
} else if (vxlan->flags & VXLAN_F_L3MISS) {
- ipa.sin6.sin6_addr = *daddr;
- ipa.sa.sa_family = AF_INET6;
+ union vxlan_addr ipa = {
+ .sin6.sin6_addr = msg->target,
+ .sa.sa_family = AF_INET6,
+ };
+
vxlan_ip_miss(dev, &ipa);
}
--
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