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Commit b0e010c5 authored by Alex Gartrell's avatar Alex Gartrell Committed by Simon Horman
Browse files

ipvs: replace ip_vs_fill_ip4hdr with ip_vs_fill_iph_skb_off 



This removes some duplicated code and makes the ICMPv6 path look more like
the ICMP path.

Signed-off-by: default avatarAlex Gartrell <agartrell@fb.com>
Acked-by: default avatarJulian Anastasov <ja@ssi.bg>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
parent 851345c5

include/net/ip_vs.h

+29 −20
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ static inline struct net *seq_file_single_net(struct seq_file *seq) 
extern int ip_vs_conn_tab_size;



struct ip_vs_iphdr {

	__u32 off;	/* Where IP or IPv4 header starts */

	__u32 len;	/* IPv4 simply where L4 starts

			 * IPv6 where L4 Transport Header starts */

	__u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
@@ -120,48 +121,56 @@ static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset, 
	return skb_header_pointer(skb, offset, len, buffer);

}



static inline void

ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)

{

	const struct iphdr *iph = nh;



	iphdr->len	= iph->ihl * 4;

	iphdr->fragoffs	= 0;

	iphdr->protocol	= iph->protocol;

	iphdr->saddr.ip	= iph->saddr;

	iphdr->daddr.ip	= iph->daddr;

}



/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.

 * IPv6 requires some extra work, as finding proper header position,

 * depend on the IPv6 extension headers.

 */

static inline void

ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)

static inline int

ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,

		       struct ip_vs_iphdr *iphdr)

{

	iphdr->off = offset;

#ifdef CONFIG_IP_VS_IPV6

	if (af == AF_INET6) {

		const struct ipv6hdr *iph =

			(struct ipv6hdr *)skb_network_header(skb);

		struct ipv6hdr _iph;

		const struct ipv6hdr *iph = skb_header_pointer(

			skb, offset, sizeof(_iph), &_iph);

		if (!iph)

			return 0;



		iphdr->saddr.in6 = iph->saddr;

		iphdr->daddr.in6 = iph->daddr;

		/* ipv6_find_hdr() updates len, flags */

		iphdr->len	 = 0;

		iphdr->len	 = offset;

		iphdr->flags	 = 0;

		iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,

						 &iphdr->fragoffs,

						 &iphdr->flags);

		if (iphdr->protocol < 0)

			return 0;

	} else

#endif

	{

		const struct iphdr *iph =

			(struct iphdr *)skb_network_header(skb);

		iphdr->len	= iph->ihl * 4;

		struct iphdr _iph;

		const struct iphdr *iph = skb_header_pointer(

			skb, offset, sizeof(_iph), &_iph);

		if (!iph)

			return 0;



		iphdr->len	= offset + iph->ihl * 4;

		iphdr->fragoffs	= 0;

		iphdr->protocol	= iph->protocol;

		iphdr->saddr.ip	= iph->saddr;

		iphdr->daddr.ip	= iph->daddr;

	}



	return 1;

}



static inline int

ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)

{

	return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb), iphdr);

}



static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,

net/netfilter/ipvs/ip_vs_core.c

+26 −44
Original line number Diff line number Diff line
@@ -436,7 +436,7 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 
	 * with persistence the connection is created on SYN+ACK.

	 */

	if (pptr[0] == FTPDATA) {

		IP_VS_DBG_PKT(12, svc->af, pp, skb, 0,

		IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,

			      "Not scheduling FTPDATA");

		return NULL;

	}
@@ -446,7 +446,7 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 
	 */

	if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) &&

	    (cp = pp->conn_in_get(svc->af, skb, iph, 1))) {

		IP_VS_DBG_PKT(12, svc->af, pp, skb, 0,

		IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,

			      "Not scheduling reply for existing connection");

		__ip_vs_conn_put(cp);

		return NULL;
@@ -934,8 +934,8 @@ static int ip_vs_out_icmp(struct sk_buff *skb, int *related, 
	IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,

		      "Checking outgoing ICMP for");



	ip_vs_fill_ip4hdr(cih, &ciph);

	ciph.len += offset;

	ip_vs_fill_iph_skb_off(AF_INET, skb, offset, &ciph);



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

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

	if (!cp)
@@ -951,12 +951,11 @@ static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, 
			     unsigned int hooknum, struct ip_vs_iphdr *ipvsh)

{

	struct icmp6hdr	_icmph, *ic;

	struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */

	struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */

	struct ip_vs_conn *cp;

	struct ip_vs_protocol *pp;

	union nf_inet_addr snet;

	unsigned int writable;

	unsigned int offset;



	*related = 1;

	ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh);
@@ -984,17 +983,9 @@ static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, 
		  ic->icmp6_type, ntohs(icmpv6_id(ic)),

		  &ipvsh->saddr, &ipvsh->daddr);



	/* Now find the contained IP header */

	ciph.len = ipvsh->len + sizeof(_icmph);

	ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h);

	if (ip6h == NULL)

	if (!ip_vs_fill_iph_skb_off(AF_INET6, skb, ipvsh->len + sizeof(_icmph),

				    &ciph))

		return NF_ACCEPT; /* The packet looks wrong, ignore */

	ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */

	ciph.daddr.in6 = ip6h->daddr;

	/* skip possible IPv6 exthdrs of contained IPv6 packet */

	ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL);

	if (ciph.protocol < 0)

		return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */



	pp = ip_vs_proto_get(ciph.protocol);

	if (!pp)
@@ -1006,9 +997,9 @@ static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, 
		return NF_ACCEPT;



	snet.in6 = ciph.saddr.in6;

	writable = ciph.len;

	offset = ciph.len;

	return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp,

				    pp, writable, sizeof(struct ipv6hdr),

				    pp, offset, sizeof(struct ipv6hdr),

				    hooknum);

}

#endif
@@ -1093,7 +1084,7 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, 
{

	struct ip_vs_protocol *pp = pd->pp;



	IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet");

	IP_VS_DBG_PKT(11, af, pp, skb, iph->off, "Outgoing packet");



	if (!skb_make_writable(skb, iph->len))

		goto drop;
@@ -1130,7 +1121,7 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, 
	if (ip_vs_route_me_harder(af, skb, hooknum))

		goto drop;



	IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT");

	IP_VS_DBG_PKT(10, af, pp, skb, iph->off, "After SNAT");



	ip_vs_out_stats(cp, skb);

	ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);
@@ -1221,7 +1212,7 @@ ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) 
					       ip_vs_defrag_user(hooknum)))

				return NF_STOLEN;



			ip_vs_fill_ip4hdr(skb_network_header(skb), &iph);

			ip_vs_fill_iph_skb(AF_INET, skb, &iph);

		}



	/*
@@ -1272,7 +1263,7 @@ ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) 
			}

		}

	}

	IP_VS_DBG_PKT(12, af, pp, skb, 0,

	IP_VS_DBG_PKT(12, af, pp, skb, iph.off,

		      "ip_vs_out: packet continues traversal as normal");

	return NF_ACCEPT;

}
@@ -1416,9 +1407,9 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) 
		      "Checking incoming ICMP for");



	offset2 = offset;

	ip_vs_fill_ip4hdr(cih, &ciph);

	ciph.len += offset;

	ip_vs_fill_iph_skb_off(AF_INET, skb, offset, &ciph);

	offset = ciph.len;



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

	 * For IPIP this is error for request, not for reply.

	 */
@@ -1511,13 +1502,12 @@ static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, 
			    unsigned int hooknum, struct ip_vs_iphdr *iph)

{

	struct net *net = NULL;

	struct ipv6hdr _ip6h, *ip6h;

	struct icmp6hdr	_icmph, *ic;

	struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */

	struct ip_vs_conn *cp;

	struct ip_vs_protocol *pp;

	struct ip_vs_proto_data *pd;

	unsigned int offs_ciph, writable, verdict;

	unsigned int offset, verdict;



	*related = 1;
@@ -1546,18 +1536,9 @@ static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, 
		  ic->icmp6_type, ntohs(icmpv6_id(ic)),

		  &iph->saddr, &iph->daddr);



	/* Now find the contained IP header */

	ciph.len = iph->len + sizeof(_icmph);

	offs_ciph = ciph.len; /* Save ip header offset */

	ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h);

	if (ip6h == NULL)

		return NF_ACCEPT; /* The packet looks wrong, ignore */

	ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */

	ciph.daddr.in6 = ip6h->daddr;

	/* skip possible IPv6 exthdrs of contained IPv6 packet */

	ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL);

	if (ciph.protocol < 0)

		return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */

	offset = iph->len + sizeof(_icmph);

	if (!ip_vs_fill_iph_skb_off(AF_INET6, skb, offset, &ciph))

		return NF_ACCEPT;



	net = skb_net(skb);

	pd = ip_vs_proto_data_get(net, ciph.protocol);
@@ -1569,7 +1550,7 @@ static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, 
	if (ciph.fragoffs)

		return NF_ACCEPT;



	IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph,

	IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset,

		      "Checking incoming ICMPv6 for");



	/* The embedded headers contain source and dest in reverse order
@@ -1591,12 +1572,12 @@ static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, 
	ip_vs_in_stats(cp, skb);



	/* Need to mangle contained IPv6 header in ICMPv6 packet */

	writable = ciph.len;

	offset = ciph.len;

	if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol ||

	    IPPROTO_SCTP == ciph.protocol)

		writable += 2 * sizeof(__u16); /* Also mangle ports */

		offset += 2 * sizeof(__u16); /* Also mangle ports */



	verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph);

	verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset, hooknum, &ciph);



	__ip_vs_conn_put(cp);
@@ -1720,12 +1701,13 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) 
			 * is missing module nf_defrag_ipv6

			 */

			IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n");

			IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment");

			IP_VS_DBG_PKT(7, af, pp, skb, iph.off,

				      "unhandled fragment");

		}

		return NF_ACCEPT;

	}



	IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet");

	IP_VS_DBG_PKT(11, af, pp, skb, iph.off, "Incoming packet");

	/* Check the server status */

	if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {

		/* the destination server is not available */

net/netfilter/ipvs/ip_vs_xmit.c

+8 −7
Original line number Diff line number Diff line
@@ -723,7 +723,7 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 
		struct nf_conn *ct = nf_ct_get(skb, &ctinfo);



		if (ct && !nf_ct_is_untracked(ct)) {

			IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0,

			IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, ipvsh->off,

					 "ip_vs_nat_xmit(): "

					 "stopping DNAT to local address");

			goto tx_error;
@@ -733,8 +733,9 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 


	/* From world but DNAT to loopback address? */

	if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) {

		IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): "

				 "stopping DNAT to loopback address");

		IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, ipvsh->off,

				 "ip_vs_nat_xmit(): stopping DNAT to loopback "

				 "address");

		goto tx_error;

	}
@@ -751,7 +752,7 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 
	ip_hdr(skb)->daddr = cp->daddr.ip;

	ip_send_check(ip_hdr(skb));



	IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT");

	IP_VS_DBG_PKT(10, AF_INET, pp, skb, ipvsh->off, "After DNAT");



	/* FIXME: when application helper enlarges the packet and the length

	   is larger than the MTU of outgoing device, there will be still
@@ -812,7 +813,7 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 
		struct nf_conn *ct = nf_ct_get(skb, &ctinfo);



		if (ct && !nf_ct_is_untracked(ct)) {

			IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0,

			IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, ipvsh->off,

					 "ip_vs_nat_xmit_v6(): "

					 "stopping DNAT to local address");

			goto tx_error;
@@ -823,7 +824,7 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 
	/* From world but DNAT to loopback address? */

	if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) &&

	    ipv6_addr_type(&cp->daddr.in6) & IPV6_ADDR_LOOPBACK) {

		IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0,

		IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, ipvsh->off,

				 "ip_vs_nat_xmit_v6(): "

				 "stopping DNAT to loopback address");

		goto tx_error;
@@ -841,7 +842,7 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 
		goto tx_error;

	ipv6_hdr(skb)->daddr = cp->daddr.in6;



	IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT");

	IP_VS_DBG_PKT(10, AF_INET6, pp, skb, ipvsh->off, "After DNAT");



	/* FIXME: when application helper enlarges the packet and the length

	   is larger than the MTU of outgoing device, there will be still