inet: generalize ipv4-only RFC3168 5.3 ecn fragmentation handling for future use by ipv6

This patch just moves some code arround to make the ip4_frag_ecn_table
and IPFRAG_ECN_* constants accessible from the other reassembly engines. I
also renamed ip4_frag_ecn_table to ip_frag_ecn_table.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jesper Dangaard Brouer <jbrouer@redhat.com>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 30 deletions

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index a6445b843ef4..938520668b2f 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -79,40 +79,11 @@ struct ipq {
         struct inet_peer *peer;
 };
 
-/* RFC 3168 support :
- * We want to check ECN values of all fragments, do detect invalid combinations.
- * In ipq->ecn, we store the OR value of each ip4_frag_ecn() fragment value.
- */
-#define IPFRAG_ECN_NOT_ECT      0x01 /* one frag had ECN_NOT_ECT */
-#define IPFRAG_ECN_ECT_1        0x02 /* one frag had ECN_ECT_1 */
-#define IPFRAG_ECN_ECT_0        0x04 /* one frag had ECN_ECT_0 */
-#define IPFRAG_ECN_CE           0x08 /* one frag had ECN_CE */
-
 static inline u8 ip4_frag_ecn(u8 tos)
 {
         return 1 << (tos & INET_ECN_MASK);
 }
 
-/* Given the OR values of all fragments, apply RFC 3168 5.3 requirements
- * Value : 0xff if frame should be dropped.
- *         0 or INET_ECN_CE value, to be ORed in to final iph->tos field
- */
-static const u8 ip4_frag_ecn_table[16] = {
-        /* at least one fragment had CE, and others ECT_0 or ECT_1 */
-        [IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0]                      = INET_ECN_CE,
-        [IPFRAG_ECN_CE | IPFRAG_ECN_ECT_1]                      = INET_ECN_CE,
-        [IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1]   = INET_ECN_CE,
-
-        /* invalid combinations : drop frame */
-        [IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE] = 0xff,
-        [IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_0] = 0xff,
-        [IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_1] = 0xff,
-        [IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1] = 0xff,
-        [IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0] = 0xff,
-        [IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_1] = 0xff,
-        [IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1] = 0xff,
-};
-
 static struct inet_frags ip4_frags;
 
 int ip_frag_nqueues(struct net *net)
@@ -551,7 +522,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 
         ipq_kill(qp);
 
-        ecn = ip4_frag_ecn_table[qp->ecn];
+        ecn = ip_frag_ecn_table[qp->ecn];
         if (unlikely(ecn == 0xff)) {
                 err = -EINVAL;
                 goto out_fail;