ip: introduce ip_is_fragment helper inline function

There are enough instances of this:

    iph->frag_off & htons(IP_MF | IP_OFFSET)

that a helper function is probably warranted.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

19 files changed, 27 insertions, 23 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index d117280b9cd8..ebb1d219b45c 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3438,7 +3438,7 @@ static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
         int layer4_xor = 0;
 
         if (skb->protocol == htons(ETH_P_IP)) {
-                if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
+                if (!ip_is_fragment(iph) &&
                     (iph->protocol == IPPROTO_TCP ||
                      iph->protocol == IPPROTO_UDP)) {
                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
diff --git a/drivers/net/ioc3-eth.c b/drivers/net/ioc3-eth.c
index 32f07f868d89..318a25a92310 100644
--- a/drivers/net/ioc3-eth.c
+++ b/drivers/net/ioc3-eth.c
@@ -532,7 +532,7 @@ static void ioc3_tcpudp_checksum(struct sk_buff *skb, uint32_t hwsum, int len)
                 return;
 
         ih = (struct iphdr *) ((char *)eh + ETH_HLEN);
-        if (ih->frag_off & htons(IP_MF | IP_OFFSET))
+        if (ip_is_fragment(ih))
                 return;
 
         proto = ih->protocol;
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index 3e89a842fc5e..3ed5f3505cea 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -2257,7 +2257,7 @@ myri10ge_get_frag_header(struct skb_frag_struct *frag, void **mac_hdr,
         *ip_hdr = iph;
         if (iph->protocol != IPPROTO_TCP)
                 return -1;
-        if (iph->frag_off & htons(IP_MF | IP_OFFSET))
+        if (ip_is_fragment(iph))
                 return -1;
         *hdr_flags |= LRO_TCP;
         *tcpudp_hdr = (u8 *) (*ip_hdr) + (iph->ihl << 2);
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index f4d80f9050ef..043850b8c304 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -4109,7 +4109,7 @@ static netdev_tx_t s2io_xmit(struct sk_buff *skb, struct net_device *dev)
                         struct tcphdr *th;
                         ip = ip_hdr(skb);
 
-                        if ((ip->frag_off & htons(IP_OFFSET|IP_MF)) == 0) {
+                        if (!ip_is_fragment(ip)) {
                                 th = (struct tcphdr *)(((unsigned char *)ip) +
                                                        ip->ihl*4);
 
diff --git a/drivers/net/sfc/filter.c b/drivers/net/sfc/filter.c
index 95a980fd63d5..f2fc2587c09d 100644
--- a/drivers/net/sfc/filter.c
+++ b/drivers/net/sfc/filter.c
@@ -652,7 +652,7 @@ int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
         /* RFS must validate the IP header length before calling us */
         EFX_BUG_ON_PARANOID(!pskb_may_pull(skb, nhoff + sizeof(*ip)));
         ip = (const struct iphdr *)(skb->data + nhoff);
-        if (ip->frag_off & htons(IP_MF | IP_OFFSET))
+        if (ip_is_fragment(ip))
                 return -EPROTONOSUPPORT;
         EFX_BUG_ON_PARANOID(!pskb_may_pull(skb, nhoff + 4 * ip->ihl + 4));
         ports = (const __be16 *)(skb->data + nhoff + 4 * ip->ihl);
diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
index 54ca74806bb6..1c92af392992 100644
--- a/drivers/net/vxge/vxge-main.c
+++ b/drivers/net/vxge/vxge-main.c
@@ -633,7 +633,7 @@ static u32 vxge_get_vpath_no(struct vxgedev *vdev, struct sk_buff *skb)
 
                 ip = ip_hdr(skb);
 
-                if ((ip->frag_off & htons(IP_OFFSET|IP_MF)) == 0) {
+                if (!ip_is_fragment(ip)) {
                         th = (struct tcphdr *)(((unsigned char *)ip) +
                                         ip->ihl*4);
 
diff --git a/include/net/ip.h b/include/net/ip.h
index e9ea7c73f8c1..d603cd329c4e 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -250,6 +250,11 @@ int ip_decrease_ttl(struct iphdr *iph)
         return --iph->ttl;
 }
 
+static inline bool ip_is_fragment(const struct iphdr *iph)
+{
+        return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
+}
+
 static inline
 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
 {
diff --git a/net/core/dev.c b/net/core/dev.c
index 8efe85070131..6b6ef14b42f2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2532,7 +2532,7 @@ __u32 __skb_get_rxhash(struct sk_buff *skb)
                         goto done;
 
                 ip = (const struct iphdr *) (skb->data + nhoff);
-                if (ip->frag_off & htons(IP_MF | IP_OFFSET))
+                if (ip_is_fragment(ip))
                         ip_proto = 0;
                 else
                         ip_proto = ip->protocol;
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index c8f48efc5fd3..073a9b01c40c 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -165,7 +165,7 @@ int ip_call_ra_chain(struct sk_buff *skb)
                     (!sk->sk_bound_dev_if ||
                      sk->sk_bound_dev_if == dev->ifindex) &&
                     net_eq(sock_net(sk), dev_net(dev))) {
-                        if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
+                        if (ip_is_fragment(ip_hdr(skb))) {
                                 if (ip_defrag(skb, IP_DEFRAG_CALL_RA_CHAIN))
                                         return 1;
                         }
@@ -256,7 +256,7 @@ int ip_local_deliver(struct sk_buff *skb)
          *      Reassemble IP fragments.
          */
 
-        if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
+        if (ip_is_fragment(ip_hdr(skb))) {
                 if (ip_defrag(skb, IP_DEFRAG_LOCAL_DELIVER))
                         return 0;
         }
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index a8024eaa0e87..167da8ba416a 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -489,7 +489,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
 
                 if (first_len - hlen > mtu ||
                     ((first_len - hlen) & 7) ||
-                    (iph->frag_off & htons(IP_MF|IP_OFFSET)) ||
+                    ip_is_fragment(iph) ||
                     skb_cloned(skb))
                         goto slow_path;
 
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index ab7e5542c1cf..ae93dd5ef401 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -932,7 +932,7 @@ static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, str
                 goto drop;
 
         /* Fragments are not supported */
-        if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
+        if (ip_is_fragment(h)) {
                 if (net_ratelimit())
                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
                                "reply.\n");
diff --git a/net/ipv4/netfilter/nf_defrag_ipv4.c b/net/ipv4/netfilter/nf_defrag_ipv4.c
index f3a9b42b16c6..9bb1b8a37a22 100644
--- a/net/ipv4/netfilter/nf_defrag_ipv4.c
+++ b/net/ipv4/netfilter/nf_defrag_ipv4.c
@@ -82,7 +82,7 @@ static unsigned int ipv4_conntrack_defrag(unsigned int hooknum,
 #endif
 #endif
         /* Gather fragments. */
-        if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
+        if (ip_is_fragment(ip_hdr(skb))) {
                 enum ip_defrag_users user = nf_ct_defrag_user(hooknum, skb);
                 if (nf_ct_ipv4_gather_frags(skb, user))
                         return NF_STOLEN;
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
index 483b76d042da..a6e606e84820 100644
--- a/net/ipv4/netfilter/nf_nat_standalone.c
+++ b/net/ipv4/netfilter/nf_nat_standalone.c
@@ -88,7 +88,7 @@ nf_nat_fn(unsigned int hooknum,
 
         /* We never see fragments: conntrack defrags on pre-routing
            and local-out, and nf_nat_out protects post-routing. */
-        NF_CT_ASSERT(!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)));
+        NF_CT_ASSERT(!ip_is_fragment(ip_hdr(skb)));
 
         ct = nf_ct_get(skb, &ctinfo);
         /* Can't track?  It's not due to stress, or conntrack would
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 981e43eaf704..fc5368ad2b0d 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -117,7 +117,7 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
         memset(fl4, 0, sizeof(struct flowi4));
         fl4->flowi4_mark = skb->mark;
 
-        if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
+        if (!ip_is_fragment(iph)) {
                 switch (iph->protocol) {
                 case IPPROTO_UDP:
                 case IPPROTO_UDPLITE:
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index e33d48cae9fd..4f77bb16d22a 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -852,7 +852,7 @@ static int ip_vs_out_icmp(struct sk_buff *skb, int *related,
         *related = 1;
 
         /* reassemble IP fragments */
-        if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
+        if (ip_is_fragment(ip_hdr(skb))) {
                 if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum)))
                         return NF_STOLEN;
         }
@@ -1156,8 +1156,7 @@ ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af)
                 ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
         } else
 #endif
-                if (unlikely(ip_hdr(skb)->frag_off & htons(IP_MF|IP_OFFSET) &&
-                             !pp->dont_defrag)) {
+                if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) {
                         if (ip_vs_gather_frags(skb,
                                                ip_vs_defrag_user(hooknum)))
                                 return NF_STOLEN;
@@ -1310,7 +1309,7 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
         *related = 1;
 
         /* reassemble IP fragments */
-        if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
+        if (ip_is_fragment(ip_hdr(skb))) {
                 if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum)))
                         return NF_STOLEN;
         }
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 8ec01391d988..34533a5d1b3a 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -121,7 +121,7 @@ static u32 flow_get_proto_src(struct sk_buff *skb)
                 if (!pskb_network_may_pull(skb, sizeof(*iph)))
                         break;
                 iph = ip_hdr(skb);
-                if (iph->frag_off & htons(IP_MF | IP_OFFSET))
+                if (ip_is_fragment(iph))
                         break;
                 poff = proto_ports_offset(iph->protocol);
                 if (poff >= 0 &&
@@ -163,7 +163,7 @@ static u32 flow_get_proto_dst(struct sk_buff *skb)
                 if (!pskb_network_may_pull(skb, sizeof(*iph)))
                         break;
                 iph = ip_hdr(skb);
-                if (iph->frag_off & htons(IP_MF | IP_OFFSET))
+                if (ip_is_fragment(iph))
                         break;
                 poff = proto_ports_offset(iph->protocol);
                 if (poff >= 0 &&
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index 402c44b241a3..ed691b148384 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -167,7 +167,7 @@ restart:
         dst = &nhptr->daddr;
         protocol = nhptr->protocol;
         xprt = ((u8 *)nhptr) + (nhptr->ihl<<2);
-        if (nhptr->frag_off & htons(IP_MF | IP_OFFSET))
+        if (ip_is_fragment(nhptr))
                 return -1;
 #endif
 
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 06afbaeb4c88..3422b25df9e4 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -181,7 +181,7 @@ static bool choke_match_flow(struct sk_buff *skb1,
                     ip1->saddr != ip2->saddr || ip1->daddr != ip2->daddr)
                         return false;
 
-                if ((ip1->frag_off | ip2->frag_off) & htons(IP_MF | IP_OFFSET))
+                if (ip_is_fragment(ip1) | ip_is_fragment(ip2))
                         ip_proto = 0;
                 off1 += ip1->ihl * 4;
                 off2 += ip2->ihl * 4;
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index b6ea6afa55b0..4536ee64383e 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -157,7 +157,7 @@ static unsigned int sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb)
                 iph = ip_hdr(skb);
                 h = (__force u32)iph->daddr;
                 h2 = (__force u32)iph->saddr ^ iph->protocol;
-                if (iph->frag_off & htons(IP_MF | IP_OFFSET))
+                if (ip_is_fragment(iph))
                         break;
                 poff = proto_ports_offset(iph->protocol);
                 if (poff >= 0 &&