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xfrm: expose local_rxpmtu via ipv6_stubs

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We cannot call this function from the core kernel unless we would force
CONFIG_IPV6=y.

Therefore expose this via ipv6_stubs so we can call it from net/xfrm
in the followup patch.

Since the call is expected to be unlikely, no extra code for the IPV6=y
case is added and we will always eat the indirection cost.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2020-05-04 10:06:06 +02:00 committed by Steffen Klassert
parent 171916cbd5
commit 3e50ddd8b8
4 changed files with 4 additions and 1 deletions
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1
include/net/ipv6_stubs.h
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@ -57,6 +57,7 @@ struct ipv6_stub {
const struct in6_addr *solicited_addr,
bool router, bool solicited, bool override, bool inc_opt);
#if IS_ENABLED(CONFIG_XFRM)
void (*xfrm6_local_rxpmtu)(struct sk_buff *skb, u32 mtu);
int (*xfrm6_udp_encap_rcv)(struct sock *sk, struct sk_buff *skb);
int (*xfrm6_rcv_encap)(struct sk_buff *skb, int nexthdr, __be32 spi,
int encap_type);

1
include/net/xfrm.h
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@ -1608,6 +1608,7 @@ int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
u8 **prevhdr);
#ifdef CONFIG_XFRM
void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu);
int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
int xfrm_user_policy(struct sock *sk, int optname,

1
net/ipv6/af_inet6.c
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@ -963,6 +963,7 @@ static const struct ipv6_stub ipv6_stub_impl = {
.udpv6_encap_enable = udpv6_encap_enable,
.ndisc_send_na = ndisc_send_na,
#if IS_ENABLED(CONFIG_XFRM)
.xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
.xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
.xfrm6_rcv_encap = xfrm6_rcv_encap,
#endif

2
net/ipv6/xfrm6_output.c
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@ -40,7 +40,7 @@ static int xfrm6_local_dontfrag(struct sk_buff *skb)
return 0;
}
static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
{
struct flowi6 fl6;
struct sock *sk = skb->sk;