xfrm: remove output2 indirection from xfrm_mode

similar to previous patch: no external module dependencies,
so we can avoid the indirection by placing this in the core.

This change removes the last indirection from xfrm_mode and the
xfrm4|6_mode_{beet,tunnel}.c modules contain (almost) no code anymore.

Before:
   text    data     bss     dec     hex filename
   3957     136       0    4093     ffd net/xfrm/xfrm_output.o
    587      44       0     631     277 net/ipv4/xfrm4_mode_beet.o
    649      32       0     681     2a9 net/ipv4/xfrm4_mode_tunnel.o
    625      44       0     669     29d net/ipv6/xfrm6_mode_beet.o
    599      32       0     631     277 net/ipv6/xfrm6_mode_tunnel.o
After:
   text    data     bss     dec     hex filename
   5359     184       0    5543    15a7 net/xfrm/xfrm_output.o
    171      24       0     195      c3 net/ipv4/xfrm4_mode_beet.o
    171      24       0     195      c3 net/ipv4/xfrm4_mode_tunnel.o
    172      24       0     196      c4 net/ipv6/xfrm6_mode_beet.o
    172      24       0     196      c4 net/ipv6/xfrm6_mode_tunnel.o

v2: fold the *encap_add functions into xfrm*_prepare_output
    preserve (move) output2 comment (Sabrina)
    use x->outer_mode->encap, not inner
    fix a build breakage on ppc (kbuild robot)

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

2 files changed, 0 insertions, 112 deletions

diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c
index 500960172933..ba84b278e627 100644
--- a/net/ipv4/xfrm4_mode_beet.c
+++ b/net/ipv4/xfrm4_mode_beet.c
@@ -17,71 +17,8 @@
 #include <net/ip.h>
 #include <net/xfrm.h>
 
-static void xfrm4_beet_make_header(struct sk_buff *skb)
-{
-	struct iphdr *iph = ip_hdr(skb);
-
-	iph->ihl = 5;
-	iph->version = 4;
-
-	iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
-	iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
-
-	iph->id = XFRM_MODE_SKB_CB(skb)->id;
-	iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
-	iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
-}
-
-/* Add encapsulation header.
- *
- * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
- */
-static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
-{
-	struct ip_beet_phdr *ph;
-	struct iphdr *top_iph;
-	int hdrlen, optlen;
-
-	hdrlen = 0;
-	optlen = XFRM_MODE_SKB_CB(skb)->optlen;
-	if (unlikely(optlen))
-		hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
-
-	skb_set_network_header(skb, -x->props.header_len -
-				    hdrlen + (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph)));
-	if (x->sel.family != AF_INET6)
-		skb->network_header += IPV4_BEET_PHMAXLEN;
-	skb->mac_header = skb->network_header +
-			  offsetof(struct iphdr, protocol);
-	skb->transport_header = skb->network_header + sizeof(*top_iph);
-
-	xfrm4_beet_make_header(skb);
-
-	ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
-
-	top_iph = ip_hdr(skb);
-
-	if (unlikely(optlen)) {
-		BUG_ON(optlen < 0);
-
-		ph->padlen = 4 - (optlen & 4);
-		ph->hdrlen = optlen / 8;
-		ph->nexthdr = top_iph->protocol;
-		if (ph->padlen)
-			memset(ph + 1, IPOPT_NOP, ph->padlen);
-
-		top_iph->protocol = IPPROTO_BEETPH;
-		top_iph->ihl = sizeof(struct iphdr) / 4;
-	}
-
-	top_iph->saddr = x->props.saddr.a4;
-	top_iph->daddr = x->id.daddr.a4;
-
-	return 0;
-}
 
 static struct xfrm_mode xfrm4_beet_mode = {
-	.output2 = xfrm4_beet_output,
 	.owner = THIS_MODULE,
 	.encap = XFRM_MODE_BEET,
 	.flags = XFRM_MODE_FLAG_TUNNEL,
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index 31645319aaeb..b2b132c800fc 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -15,56 +15,7 @@
 #include <net/ip.h>
 #include <net/xfrm.h>
 
-/* Add encapsulation header.
- *
- * The top IP header will be constructed per RFC 2401.
- */
-static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
-{
-	struct dst_entry *dst = skb_dst(skb);
-	struct iphdr *top_iph;
-	int flags;
-
-	skb_set_inner_network_header(skb, skb_network_offset(skb));
-	skb_set_inner_transport_header(skb, skb_transport_offset(skb));
-
-	skb_set_network_header(skb, -x->props.header_len);
-	skb->mac_header = skb->network_header +
-			  offsetof(struct iphdr, protocol);
-	skb->transport_header = skb->network_header + sizeof(*top_iph);
-	top_iph = ip_hdr(skb);
-
-	top_iph->ihl = 5;
-	top_iph->version = 4;
-
-	top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
-
-	/* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */
-	if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
-		top_iph->tos = 0;
-	else
-		top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
-	top_iph->tos = INET_ECN_encapsulate(top_iph->tos,
-					    XFRM_MODE_SKB_CB(skb)->tos);
-
-	flags = x->props.flags;
-	if (flags & XFRM_STATE_NOECN)
-		IP_ECN_clear(top_iph);
-
-	top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
-		0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
-
-	top_iph->ttl = ip4_dst_hoplimit(xfrm_dst_child(dst));
-
-	top_iph->saddr = x->props.saddr.a4;
-	top_iph->daddr = x->id.daddr.a4;
-	ip_select_ident(dev_net(dst->dev), skb, NULL);
-
-	return 0;
-}
-
 static struct xfrm_mode xfrm4_tunnel_mode = {
-	.output2 = xfrm4_mode_tunnel_output,
 	.owner = THIS_MODULE,
 	.encap = XFRM_MODE_TUNNEL,
 	.flags = XFRM_MODE_FLAG_TUNNEL,