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Commit f2428ed5 authored by Simon Horman's avatar Simon Horman
Browse files

ipvs: load balance ipv6 connections from a local process 



This allows IPVS to load balance IPv6 connections made by a local process.
For example a proxy server running locally.

External client --> pound:443 -> Local:443 --> IPVS:80 --> RealServer

This is an extenstion to the IPv4 work done in this area
by Siim Põder and Malcolm Turnbull.

Cc: Siim Põder <siim@p6drad-teel.net>
Cc: Malcolm Turnbull <malcolm@loadbalancer.org>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
parent 4856c84c

net/ipv4/ipvs/ip_vs_core.c

+41 −50
Original line number Diff line number Diff line
@@ -654,8 +654,9 @@ void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 
/* Handle relevant response ICMP messages - forward to the right

 * destination host. Used for NAT and local client.

 */

static int handle_response_icmp(struct sk_buff *skb, struct iphdr *iph,

				struct iphdr *cih, struct ip_vs_conn *cp,

static int handle_response_icmp(int af, struct sk_buff *skb,

				union nf_inet_addr *snet,

				__u8 protocol, struct ip_vs_conn *cp,

				struct ip_vs_protocol *pp,

				unsigned int offset, unsigned int ihl)

{
@@ -669,17 +670,21 @@ static int handle_response_icmp(struct sk_buff *skb, struct iphdr *iph, 
	/* Ensure the checksum is correct */

	if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {

		/* Failed checksum! */

		IP_VS_DBG(1,

			  "Forward ICMP: failed checksum from %d.%d.%d.%d!\n",

			  NIPQUAD(iph->saddr));

		IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",

			      IP_VS_DBG_ADDR(af, snet));

		goto out;

	}



	if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol)

	if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol)

		offset += 2 * sizeof(__u16);

	if (!skb_make_writable(skb, offset))

		goto out;



#ifdef CONFIG_IP_VS_IPV6

	if (af == AF_INET6)

		ip_vs_nat_icmp_v6(skb, pp, cp, 1);

	else

#endif

		ip_vs_nat_icmp(skb, pp, cp, 1);



	/* do the statistics and put it back */
@@ -708,6 +713,7 @@ static int ip_vs_out_icmp(struct sk_buff *skb, int *related) 
	struct ip_vs_conn *cp;

	struct ip_vs_protocol *pp;

	unsigned int offset, ihl;

	union nf_inet_addr snet;



	*related = 1;
@@ -766,7 +772,9 @@ static int ip_vs_out_icmp(struct sk_buff *skb, int *related) 
	if (!cp)

		return NF_ACCEPT;



	return handle_response_icmp(skb, iph, cih, cp, pp, offset, ihl);

	snet.ip = iph->saddr;

	return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp,

				    pp, offset, ihl);

}



#ifdef CONFIG_IP_VS_IPV6
@@ -779,7 +787,8 @@ static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related) 
	struct ip_vs_iphdr ciph;

	struct ip_vs_conn *cp;

	struct ip_vs_protocol *pp;

	unsigned int offset, verdict;

	unsigned int offset;

	union nf_inet_addr snet;



	*related = 1;
@@ -838,40 +847,9 @@ static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related) 
	if (!cp)

		return NF_ACCEPT;



	verdict = NF_DROP;



	if (IP_VS_FWD_METHOD(cp) != 0) {

		IP_VS_ERR("shouldn't reach here, because the box is on the "

			  "half connection in the tun/dr module.\n");

	}



	/* Ensure the checksum is correct */

	if (!skb_csum_unnecessary(skb)

	    && ip_vs_checksum_complete(skb, sizeof(struct ipv6hdr))) {

		/* Failed checksum! */

		IP_VS_DBG(1, "Forward ICMPv6: failed checksum from "

			  NIP6_FMT "!\n",

			  NIP6(iph->saddr));

		goto out;

	}



	if (IPPROTO_TCP == cih->nexthdr || IPPROTO_UDP == cih->nexthdr)

		offset += 2 * sizeof(__u16);

	if (!skb_make_writable(skb, offset))

		goto out;



	ip_vs_nat_icmp_v6(skb, pp, cp, 1);



	/* do the statistics and put it back */

	ip_vs_out_stats(cp, skb);



	skb->ipvs_property = 1;

	verdict = NF_ACCEPT;



out:

	__ip_vs_conn_put(cp);



	return verdict;

	snet.in6 = iph->saddr;

	return handle_response_icmp(AF_INET6, skb, &snet, cih->nexthdr, cp,

				    pp, offset, sizeof(struct ipv6hdr));

}

#endif
@@ -1083,6 +1061,7 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) 
	struct ip_vs_conn *cp;

	struct ip_vs_protocol *pp;

	unsigned int offset, ihl, verdict;

	union nf_inet_addr snet;



	*related = 1;
@@ -1142,9 +1121,12 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) 
	if (!cp) {

		/* The packet could also belong to a local client */

		cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1);

		if (cp)

			return handle_response_icmp(skb, iph, cih, cp, pp,

		if (cp) {

			snet.ip = iph->saddr;

			return handle_response_icmp(AF_INET, skb, &snet,

						    cih->protocol, cp, pp,

						    offset, ihl);

		}

		return NF_ACCEPT;

	}
@@ -1183,6 +1165,7 @@ ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum) 
	struct ip_vs_conn *cp;

	struct ip_vs_protocol *pp;

	unsigned int offset, verdict;

	union nf_inet_addr snet;



	*related = 1;
@@ -1240,8 +1223,18 @@ ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum) 
	ip_vs_fill_iphdr(AF_INET6, cih, &ciph);

	/* The embedded headers contain source and dest in reverse order */

	cp = pp->conn_in_get(AF_INET6, skb, pp, &ciph, offset, 1);

	if (!cp)

	if (!cp) {

		/* The packet could also belong to a local client */

		cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1);

		if (cp) {

			snet.in6 = iph->saddr;

			return handle_response_icmp(AF_INET6, skb, &snet,

						    cih->nexthdr,

						    cp, pp, offset,

						    sizeof(struct ipv6hdr));

		}

		return NF_ACCEPT;

	}



	verdict = NF_DROP;
@@ -1281,9 +1274,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb, 
	 *	Big tappo: only PACKET_HOST, including loopback for local client

	 *	Don't handle local packets on IPv6 for now

	 */

	if (unlikely(skb->pkt_type != PACKET_HOST ||

		     (af == AF_INET6 || (skb->dev->flags & IFF_LOOPBACK ||

					 skb->sk)))) {

	if (unlikely(skb->pkt_type != PACKET_HOST)) {

		IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s ignored\n",

			      skb->pkt_type,

			      iph.protocol,