Commit 4394542c authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

bonding: fix l23 and l34 load balancing in forwarding path 



Since commit 6b923cb7 (bonding: support for IPv6 transmit hashing)
bonding doesn't properly hash traffic in forwarding setups.

Vitaly V. Bursov diagnosed that skb_network_header_len() returned 0 in
this case.

More generally, the transport header might not be in the skb head.

Use pskb_may_pull() & skb_header_pointer() to get it right, and use
proto_ports_offset() in bond_xmit_hash_policy_l34() to get support for
more protocols than TCP and UDP.

Reported-by: default avatarVitaly V. Bursov <vitalyb@telenet.dn.ua>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Jay Vosburgh <fubar@us.ibm.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: John Eaglesham <linux@8192.net>
Tested-by: default avatarVitaly V. Bursov <vitalyb@telenet.dn.ua>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0c14e5ce

drivers/net/bonding/bond_main.c

+30 −25
Original line number Diff line number Diff line
@@ -3296,20 +3296,22 @@ static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 
 */

static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)

{

	struct ethhdr *data = (struct ethhdr *)skb->data;

	struct iphdr *iph;

	struct ipv6hdr *ipv6h;

	const struct ethhdr *data;

	const struct iphdr *iph;

	const struct ipv6hdr *ipv6h;

	u32 v6hash;

	__be32 *s, *d;

	const __be32 *s, *d;



	if (skb->protocol == htons(ETH_P_IP) &&

	    skb_network_header_len(skb) >= sizeof(*iph)) {

	    pskb_network_may_pull(skb, sizeof(*iph))) {

		iph = ip_hdr(skb);

		data = (struct ethhdr *)skb->data;

		return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^

			(data->h_dest[5] ^ data->h_source[5])) % count;

	} else if (skb->protocol == htons(ETH_P_IPV6) &&

		   skb_network_header_len(skb) >= sizeof(*ipv6h)) {

		   pskb_network_may_pull(skb, sizeof(*ipv6h))) {

		ipv6h = ipv6_hdr(skb);

		data = (struct ethhdr *)skb->data;

		s = &ipv6h->saddr.s6_addr32[0];

		d = &ipv6h->daddr.s6_addr32[0];

		v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
@@ -3328,33 +3330,36 @@ static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 
static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)

{

	u32 layer4_xor = 0;

	struct iphdr *iph;

	struct ipv6hdr *ipv6h;

	__be32 *s, *d;

	__be16 *layer4hdr;

	const struct iphdr *iph;

	const struct ipv6hdr *ipv6h;

	const __be32 *s, *d;

	const __be16 *l4 = NULL;

	__be16 _l4[2];

	int noff = skb_network_offset(skb);

	int poff;



	if (skb->protocol == htons(ETH_P_IP) &&

	    skb_network_header_len(skb) >= sizeof(*iph)) {

	    pskb_may_pull(skb, noff + sizeof(*iph))) {

		iph = ip_hdr(skb);

		if (!ip_is_fragment(iph) &&

		    (iph->protocol == IPPROTO_TCP ||

		     iph->protocol == IPPROTO_UDP) &&

		    (skb_headlen(skb) - skb_network_offset(skb) >=

		     iph->ihl * sizeof(u32) + sizeof(*layer4hdr) * 2)) {

			layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);

			layer4_xor = ntohs(*layer4hdr ^ *(layer4hdr + 1));

		poff = proto_ports_offset(iph->protocol);



		if (!ip_is_fragment(iph) && poff >= 0) {

			l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,

						sizeof(_l4), &_l4);

			if (l4)

				layer4_xor = ntohs(l4[0] ^ l4[1]);

		}

		return (layer4_xor ^

			((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;

	} else if (skb->protocol == htons(ETH_P_IPV6) &&

		   skb_network_header_len(skb) >= sizeof(*ipv6h)) {

		   pskb_may_pull(skb, noff + sizeof(*ipv6h))) {

		ipv6h = ipv6_hdr(skb);

		if ((ipv6h->nexthdr == IPPROTO_TCP ||

		     ipv6h->nexthdr == IPPROTO_UDP) &&

		    (skb_headlen(skb) - skb_network_offset(skb) >=

		     sizeof(*ipv6h) + sizeof(*layer4hdr) * 2)) {

			layer4hdr = (__be16 *)(ipv6h + 1);

			layer4_xor = ntohs(*layer4hdr ^ *(layer4hdr + 1));

		poff = proto_ports_offset(ipv6h->nexthdr);

		if (poff >= 0) {

			l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,

						sizeof(_l4), &_l4);

			if (l4)

				layer4_xor = ntohs(l4[0] ^ l4[1]);

		}

		s = &ipv6h->saddr.s6_addr32[0];

		d = &ipv6h->daddr.s6_addr32[0];

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