[PATCH 13/33] netfilter: conntrack: remove invert_tuple callback

[Pablo Neira Ayuso]

From: Florian Westphal <f...@strlen.de>

Only used by icmp(v6).  Prefer a direct call and remove this
function from the l4proto struct.

Signed-off-by: Florian Westphal <f...@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 include/net/netfilter/nf_conntrack_l4proto.h | 11 +++++------
 net/netfilter/nf_conntrack_core.c            |  8 ++++++--
 net/netfilter/nf_conntrack_proto_icmp.c      |  5 ++---
 net/netfilter/nf_conntrack_proto_icmpv6.c    |  5 ++---
 4 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/include/net/netfilter/nf_conntrack_l4proto.h 
b/include/net/netfilter/nf_conntrack_l4proto.h
index 0d4b0398aeb9..6cec8337e684 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -27,12 +27,6 @@ struct nf_conntrack_l4proto {
        /* protoinfo nlattr size, closes a hole */
        u16 nlattr_size;
 
-       /* Invert the per-proto part of the tuple: ie. turn xmit into reply.
-        * Only used by icmp, most protocols use a generic version.
-        */
-       bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
-                            const struct nf_conntrack_tuple *orig);
-
        /* Returns verdict for packet, or -1 for invalid. */
        int (*packet)(struct nf_conn *ct,
                      struct sk_buff *skb,
@@ -95,6 +89,11 @@ bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
                         struct net *net,
                         struct nf_conntrack_tuple *tuple);
 
+bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
+                                   const struct nf_conntrack_tuple *orig);
+bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
+                                     const struct nf_conntrack_tuple *orig);
+
 int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
                              struct sk_buff *skb,
                              unsigned int dataoff,
diff --git a/net/netfilter/nf_conntrack_core.c 
b/net/netfilter/nf_conntrack_core.c
index b71e271f2b44..d56cb0fc82b6 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -423,8 +423,12 @@ nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
 
        inverse->dst.protonum = orig->dst.protonum;
 
-       if (unlikely(l4proto->invert_tuple))
-               return l4proto->invert_tuple(inverse, orig);
+       switch (orig->dst.protonum) {
+       case IPPROTO_ICMP:
+               return nf_conntrack_invert_icmp_tuple(inverse, orig);
+       case IPPROTO_ICMPV6:
+               return nf_conntrack_invert_icmpv6_tuple(inverse, orig);
+       }
 
        inverse->src.u.all = orig->dst.u.all;
        inverse->dst.u.all = orig->src.u.all;
diff --git a/net/netfilter/nf_conntrack_proto_icmp.c 
b/net/netfilter/nf_conntrack_proto_icmp.c
index 805c1fe5b837..d28c1d7633b2 100644
--- a/net/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/netfilter/nf_conntrack_proto_icmp.c
@@ -54,8 +54,8 @@ static const u_int8_t invmap[] = {
        [ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
 };
 
-static bool icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
-                             const struct nf_conntrack_tuple *orig)
+bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
+                                   const struct nf_conntrack_tuple *orig)
 {
        if (orig->dst.u.icmp.type >= sizeof(invmap) ||
            !invmap[orig->dst.u.icmp.type])
@@ -347,7 +347,6 @@ static struct nf_proto_net *icmp_get_net_proto(struct net 
*net)
 const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp =
 {
        .l4proto                = IPPROTO_ICMP,
-       .invert_tuple           = icmp_invert_tuple,
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
        .tuple_to_nlattr        = icmp_tuple_to_nlattr,
        .nlattr_tuple_size      = icmp_nlattr_tuple_size,
diff --git a/net/netfilter/nf_conntrack_proto_icmpv6.c 
b/net/netfilter/nf_conntrack_proto_icmpv6.c
index 20cd55e55e41..2910dcdea134 100644
--- a/net/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/netfilter/nf_conntrack_proto_icmpv6.c
@@ -67,8 +67,8 @@ static const u_int8_t noct_valid_new[] = {
        [ICMPV6_MLD2_REPORT - 130] = 1
 };
 
-static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
-                               const struct nf_conntrack_tuple *orig)
+bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
+                                     const struct nf_conntrack_tuple *orig)
 {
        int type = orig->dst.u.icmp.type - 128;
        if (type < 0 || type >= sizeof(invmap) || !invmap[type])
@@ -358,7 +358,6 @@ static struct nf_proto_net *icmpv6_get_net_proto(struct net 
*net)
 const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 =
 {
        .l4proto                = IPPROTO_ICMPV6,
-       .invert_tuple           = icmpv6_invert_tuple,
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
        .tuple_to_nlattr        = icmpv6_tuple_to_nlattr,
        .nlattr_tuple_size      = icmpv6_nlattr_tuple_size,
-- 
2.11.0