[IPVS]: Replace local version of skb_make_writable

This patch removes the IPVS-specific version of skb_make_writable and
replaces it with the netfilter one.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 672564e..5da3b4a 100644 (file)
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -984,7 +984,6 @@ static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
        return fwd;
 }
 
-extern int ip_vs_make_skb_writable(struct sk_buff **pskb, int len);
 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
                struct ip_vs_conn *cp, int dir);
 

diff --git a/net/ipv4/ipvs/ip_vs_app.c b/net/ipv4/ipvs/ip_vs_app.c
index 341474e..8ca5f48 100644 (file)
--- a/net/ipv4/ipvs/ip_vs_app.c
+++ b/net/ipv4/ipvs/ip_vs_app.c
@@ -25,6 +25,7 @@
 #include <linux/skbuff.h>
 #include <linux/in.h>
 #include <linux/ip.h>
+#include <linux/netfilter.h>
 #include <net/net_namespace.h>
 #include <net/protocol.h>
 #include <net/tcp.h>
@@ -336,7 +337,7 @@ static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff **pskb,
        struct tcphdr *th;
        __u32 seq;
 
-       if (!ip_vs_make_skb_writable(pskb, tcp_offset + sizeof(*th)))
+       if (!skb_make_writable(*pskb, tcp_offset + sizeof(*th)))
                return 0;
 
        th = (struct tcphdr *)(skb_network_header(*pskb) + tcp_offset);
@@ -411,7 +412,7 @@ static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff **pskb,
        struct tcphdr *th;
        __u32 seq;
 
-       if (!ip_vs_make_skb_writable(pskb, tcp_offset + sizeof(*th)))
+       if (!skb_make_writable(*pskb, tcp_offset + sizeof(*th)))
                return 0;
 
        th = (struct tcphdr *)(skb_network_header(*pskb) + tcp_offset);

diff --git a/net/ipv4/ipvs/ip_vs_core.c b/net/ipv4/ipvs/ip_vs_core.c
index 3487337..09cac38 100644 (file)
--- a/net/ipv4/ipvs/ip_vs_core.c
+++ b/net/ipv4/ipvs/ip_vs_core.c
@@ -58,7 +58,6 @@ EXPORT_SYMBOL(ip_vs_conn_put);
 #ifdef CONFIG_IP_VS_DEBUG
 EXPORT_SYMBOL(ip_vs_get_debug_level);
 #endif
-EXPORT_SYMBOL(ip_vs_make_skb_writable);
 
 
 /* ID used in ICMP lookups */
@@ -163,42 +162,6 @@ ip_vs_set_state(struct ip_vs_conn *cp, int direction,
 }
 
 
-int ip_vs_make_skb_writable(struct sk_buff **pskb, int writable_len)
-{
-       struct sk_buff *skb = *pskb;
-
-       /* skb is already used, better copy skb and its payload */
-       if (unlikely(skb_shared(skb) || skb->sk))
-               goto copy_skb;
-
-       /* skb data is already used, copy it */
-       if (unlikely(skb_cloned(skb)))
-               goto copy_data;
-
-       return pskb_may_pull(skb, writable_len);
-
-  copy_data:
-       if (unlikely(writable_len > skb->len))
-               return 0;
-       return !pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
-
-  copy_skb:
-       if (unlikely(writable_len > skb->len))
-               return 0;
-       skb = skb_copy(skb, GFP_ATOMIC);
-       if (!skb)
-               return 0;
-       BUG_ON(skb_is_nonlinear(skb));
-
-       /* Rest of kernel will get very unhappy if we pass it a
-          suddenly-orphaned skbuff */
-       if ((*pskb)->sk)
-               skb_set_owner_w(skb, (*pskb)->sk);
-       kfree_skb(*pskb);
-       *pskb = skb;
-       return 1;
-}
-
 /*
  *  IPVS persistent scheduling function
  *  It creates a connection entry according to its template if exists,
@@ -689,9 +652,8 @@ static int ip_vs_out_icmp(struct sk_buff **pskb, int *related)
 
        if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol)
                offset += 2 * sizeof(__u16);
-       if (!ip_vs_make_skb_writable(pskb, offset))
+       if (!skb_make_writable(skb, offset))
                goto out;
-       skb = *pskb;
 
        ip_vs_nat_icmp(skb, pp, cp, 1);
 
@@ -799,7 +761,7 @@ ip_vs_out(unsigned int hooknum, struct sk_buff **pskb,
 
        IP_VS_DBG_PKT(11, pp, skb, 0, "Outgoing packet");
 
-       if (!ip_vs_make_skb_writable(pskb, ihl))
+       if (!skb_make_writable(skb, ihl))
                goto drop;
 
        /* mangle the packet */

diff --git a/net/ipv4/ipvs/ip_vs_ftp.c b/net/ipv4/ipvs/ip_vs_ftp.c
index 344ddbb..4167d41 100644 (file)
--- a/net/ipv4/ipvs/ip_vs_ftp.c
+++ b/net/ipv4/ipvs/ip_vs_ftp.c
@@ -30,6 +30,7 @@
 #include <linux/skbuff.h>
 #include <linux/in.h>
 #include <linux/ip.h>
+#include <linux/netfilter.h>
 #include <net/protocol.h>
 #include <net/tcp.h>
 #include <asm/unaligned.h>
@@ -155,7 +156,7 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
                return 1;
 
        /* Linear packets are much easier to deal with. */
-       if (!ip_vs_make_skb_writable(pskb, (*pskb)->len))
+       if (!skb_make_writable(*pskb, (*pskb)->len))
                return 0;
 
        if (cp->app_data == &ip_vs_ftp_pasv) {
@@ -256,7 +257,7 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
                return 1;
 
        /* Linear packets are much easier to deal with. */
-       if (!ip_vs_make_skb_writable(pskb, (*pskb)->len))
+       if (!skb_make_writable(*pskb, (*pskb)->len))
                return 0;
 
        /*

diff --git a/net/ipv4/ipvs/ip_vs_proto_tcp.c b/net/ipv4/ipvs/ip_vs_proto_tcp.c
index e65577a..b65b1a3 100644 (file)
--- a/net/ipv4/ipvs/ip_vs_proto_tcp.c
+++ b/net/ipv4/ipvs/ip_vs_proto_tcp.c
@@ -20,6 +20,7 @@
 #include <linux/tcp.h>                  /* for tcphdr */
 #include <net/ip.h>
 #include <net/tcp.h>                    /* for csum_tcpudp_magic */
+#include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
 
 #include <net/ip_vs.h>
@@ -129,7 +130,7 @@ tcp_snat_handler(struct sk_buff **pskb,
        const unsigned int tcphoff = ip_hdrlen(*pskb);
 
        /* csum_check requires unshared skb */
-       if (!ip_vs_make_skb_writable(pskb, tcphoff+sizeof(*tcph)))
+       if (!skb_make_writable(*pskb, tcphoff+sizeof(*tcph)))
                return 0;
 
        if (unlikely(cp->app != NULL)) {
@@ -177,7 +178,7 @@ tcp_dnat_handler(struct sk_buff **pskb,
        const unsigned int tcphoff = ip_hdrlen(*pskb);
 
        /* csum_check requires unshared skb */
-       if (!ip_vs_make_skb_writable(pskb, tcphoff+sizeof(*tcph)))
+       if (!skb_make_writable(*pskb, tcphoff+sizeof(*tcph)))
                return 0;
 
        if (unlikely(cp->app != NULL)) {

diff --git a/net/ipv4/ipvs/ip_vs_proto_udp.c b/net/ipv4/ipvs/ip_vs_proto_udp.c
index 8ee5fe6..c70aa40 100644 (file)
--- a/net/ipv4/ipvs/ip_vs_proto_udp.c
+++ b/net/ipv4/ipvs/ip_vs_proto_udp.c
@@ -18,6 +18,7 @@
 #include <linux/in.h>
 #include <linux/ip.h>
 #include <linux/kernel.h>
+#include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/udp.h>
 
@@ -136,7 +137,7 @@ udp_snat_handler(struct sk_buff **pskb,
        const unsigned int udphoff = ip_hdrlen(*pskb);
 
        /* csum_check requires unshared skb */
-       if (!ip_vs_make_skb_writable(pskb, udphoff+sizeof(*udph)))
+       if (!skb_make_writable(*pskb, udphoff+sizeof(*udph)))
                return 0;
 
        if (unlikely(cp->app != NULL)) {
@@ -190,7 +191,7 @@ udp_dnat_handler(struct sk_buff **pskb,
        unsigned int udphoff = ip_hdrlen(*pskb);
 
        /* csum_check requires unshared skb */
-       if (!ip_vs_make_skb_writable(pskb, udphoff+sizeof(*udph)))
+       if (!skb_make_writable(*pskb, udphoff+sizeof(*udph)))
                return 0;
 
        if (unlikely(cp->app != NULL)) {

diff --git a/net/ipv4/ipvs/ip_vs_xmit.c b/net/ipv4/ipvs/ip_vs_xmit.c
index 666e080..afd90d4 100644 (file)
--- a/net/ipv4/ipvs/ip_vs_xmit.c
+++ b/net/ipv4/ipvs/ip_vs_xmit.c
@@ -253,7 +253,7 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
        }
 
        /* copy-on-write the packet before mangling it */
-       if (!ip_vs_make_skb_writable(&skb, sizeof(struct iphdr)))
+       if (!skb_make_writable(skb, sizeof(struct iphdr)))
                goto tx_error_put;
 
        if (skb_cow(skb, rt->u.dst.dev->hard_header_len))
@@ -529,7 +529,7 @@ ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
        }
 
        /* copy-on-write the packet before mangling it */
-       if (!ip_vs_make_skb_writable(&skb, offset))
+       if (!skb_make_writable(skb, offset))
                goto tx_error_put;
 
        if (skb_cow(skb, rt->u.dst.dev->hard_header_len))