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This removes some duplicated code and makes the ICMPv6 path look more like
the ICMP path.
Signed-off-by: Alex Gartrell <agartrell@xxxxxx>
---
include/net/ip_vs.h | 47 +++++++++++++++++++++++------------------
net/netfilter/ipvs/ip_vs_core.c | 41 ++++++++++-------------------------
2 files changed, 38 insertions(+), 50 deletions(-)
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 4e3731e..3e09725 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -120,48 +120,55 @@ 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)
{
#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,
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 38fbc19..a5ced3c 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -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)
@@ -951,7 +951,6 @@ 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;
@@ -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)
@@ -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);
}
/*
@@ -1407,6 +1398,8 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned
int hooknum)
return NF_ACCEPT;
pp = pd->pp;
+ ip_vs_fill_iph_skb_off(AF_INET, skb, offset, &ciph);
+
/* Is the embedded protocol header present? */
if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
pp->dont_defrag))
@@ -1416,9 +1409,7 @@ 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;
- offset = ciph.len;
+
/* The embedded headers contain source and dest in reverse order.
* For IPIP this is error for request, not for reply.
*/
@@ -1511,7 +1502,6 @@ 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;
@@ -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 */
+ offs_ciph = iph->len + sizeof(_icmph);
+ if (!ip_vs_fill_iph_skb_off(AF_INET6, skb, offs_ciph, &ciph))
+ return NF_ACCEPT;
net = skb_net(skb);
pd = ip_vs_proto_data_get(net, ciph.protocol);
--
Alex Gartrell <agartrell@xxxxxx>
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