From 6d64be3da282908bb17b0803b9edad8852ffea56 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 4 May 2020 10:06:03 +0200 Subject: xfrm: avoid extract_output indirection for ipv4 We can use a direct call for ipv4, so move the needed functions to net/xfrm/xfrm_output.c and call them directly. For ipv6 the indirection can be avoided as well but it will need a bit more work -- to ease review it will be done in another patch. Signed-off-by: Florian Westphal Signed-off-by: Steffen Klassert --- include/net/xfrm.h | 1 - net/ipv4/xfrm4_output.c | 40 ---------------------------------------- net/ipv4/xfrm4_state.c | 1 - net/xfrm/xfrm_output.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 46 insertions(+), 42 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 2577666c34c8..397007324abd 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -1580,7 +1580,6 @@ static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) return xfrm_input(skb, nexthdr, spi, 0); } -int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c index 89ba7c87de5d..21c8fa0a31ed 100644 --- a/net/ipv4/xfrm4_output.c +++ b/net/ipv4/xfrm4_output.c @@ -14,46 +14,6 @@ #include #include -static int xfrm4_tunnel_check_size(struct sk_buff *skb) -{ - int mtu, ret = 0; - - if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE) - goto out; - - if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df) - goto out; - - mtu = dst_mtu(skb_dst(skb)); - if ((!skb_is_gso(skb) && skb->len > mtu) || - (skb_is_gso(skb) && - !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) { - skb->protocol = htons(ETH_P_IP); - - if (skb->sk) - xfrm_local_error(skb, mtu); - else - icmp_send(skb, ICMP_DEST_UNREACH, - ICMP_FRAG_NEEDED, htonl(mtu)); - ret = -EMSGSIZE; - } -out: - return ret; -} - -int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb) -{ - int err; - - err = xfrm4_tunnel_check_size(skb); - if (err) - return err; - - XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol; - - return xfrm4_extract_header(skb); -} - int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb) { memset(IPCB(skb), 0, sizeof(*IPCB(skb))); diff --git a/net/ipv4/xfrm4_state.c b/net/ipv4/xfrm4_state.c index f8ed3c3bb928..d7c200779e4f 100644 --- a/net/ipv4/xfrm4_state.c +++ b/net/ipv4/xfrm4_state.c @@ -37,7 +37,6 @@ static struct xfrm_state_afinfo xfrm4_state_afinfo = { .output = xfrm4_output, .output_finish = xfrm4_output_finish, .extract_input = xfrm4_extract_input, - .extract_output = xfrm4_extract_output, .transport_finish = xfrm4_transport_finish, .local_error = xfrm4_local_error, }; diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c index 2fd3d990d992..a7b3af7f7a1e 100644 --- a/net/xfrm/xfrm_output.c +++ b/net/xfrm/xfrm_output.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -609,6 +610,47 @@ out: } EXPORT_SYMBOL_GPL(xfrm_output); +static int xfrm4_tunnel_check_size(struct sk_buff *skb) +{ + int mtu, ret = 0; + + if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE) + goto out; + + if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df) + goto out; + + mtu = dst_mtu(skb_dst(skb)); + if ((!skb_is_gso(skb) && skb->len > mtu) || + (skb_is_gso(skb) && + !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) { + skb->protocol = htons(ETH_P_IP); + + if (skb->sk) + xfrm_local_error(skb, mtu); + else + icmp_send(skb, ICMP_DEST_UNREACH, + ICMP_FRAG_NEEDED, htonl(mtu)); + ret = -EMSGSIZE; + } +out: + return ret; +} + +static int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb) +{ + int err; + + err = xfrm4_tunnel_check_size(skb); + if (err) + return err; + + XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol; + + xfrm4_extract_header(skb); + return 0; +} + static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) { const struct xfrm_state_afinfo *afinfo; @@ -624,6 +666,10 @@ static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) if (inner_mode == NULL) return -EAFNOSUPPORT; + switch (inner_mode->family) { + case AF_INET: + return xfrm4_extract_output(x, skb); + } rcu_read_lock(); afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family); if (likely(afinfo)) -- cgit v1.2.3