From c2d305e51038167dd9de8d476c72f667d84cad8b Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 29 Mar 2019 21:16:24 +0100 Subject: xfrm: remove input indirection from xfrm_mode No need for any indirection or abstraction here, both functions are pretty much the same and quite small, they also have no external dependencies. xfrm_prepare_input can then be made static. With allmodconfig build, size increase of vmlinux is 25 byte: Before: text data bss dec filename 15730207 6936924 4046908 26714039 vmlinux After: 15730208 6936948 4046908 26714064 vmlinux v2: Fix INET_XFRM_MODE_TRANSPORT name in is-enabled test (Sabrina Dubroca) change copied comment to refer to transport and network header, not skb->{h,nh}, which don't exist anymore. (Sabrina) make xfrm_prepare_input static (Eyal Birger) Signed-off-by: Florian Westphal Reviewed-by: Sabrina Dubroca Signed-off-by: Steffen Klassert --- include/net/xfrm.h | 11 ------ net/ipv4/xfrm4_mode_beet.c | 1 - net/ipv4/xfrm4_mode_transport.c | 23 ------------- net/ipv4/xfrm4_mode_tunnel.c | 1 - net/ipv6/xfrm6_mode_beet.c | 1 - net/ipv6/xfrm6_mode_transport.c | 25 -------------- net/ipv6/xfrm6_mode_tunnel.c | 1 - net/xfrm/xfrm_input.c | 75 +++++++++++++++++++++++++++++++++++++++-- 8 files changed, 72 insertions(+), 66 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 9a155063c25f..2c5fc9cc367d 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -436,16 +436,6 @@ struct xfrm_mode { */ int (*input2)(struct xfrm_state *x, struct sk_buff *skb); - /* - * This is the actual input entry point. - * - * For transport mode and equivalent this would be identical to - * input2 (which does not need to be set). While tunnel mode - * and equivalent would set this to the tunnel encapsulation function - * xfrm4_prepare_input that would in turn call input2. - */ - int (*input)(struct xfrm_state *x, struct sk_buff *skb); - /* * Add encapsulation header. * @@ -1606,7 +1596,6 @@ int xfrm_init_replay(struct xfrm_state *x); int xfrm_state_mtu(struct xfrm_state *x, int mtu); int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); int xfrm_init_state(struct xfrm_state *x); -int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); int xfrm_input_resume(struct sk_buff *skb, int nexthdr); int xfrm_trans_queue(struct sk_buff *skb, diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c index a2e3b52ae46c..264c4c9e2473 100644 --- a/net/ipv4/xfrm4_mode_beet.c +++ b/net/ipv4/xfrm4_mode_beet.c @@ -128,7 +128,6 @@ out: static struct xfrm_mode xfrm4_beet_mode = { .input2 = xfrm4_beet_input, - .input = xfrm_prepare_input, .output2 = xfrm4_beet_output, .output = xfrm4_prepare_output, .owner = THIS_MODULE, diff --git a/net/ipv4/xfrm4_mode_transport.c b/net/ipv4/xfrm4_mode_transport.c index 7c5443f797cf..c943d710f302 100644 --- a/net/ipv4/xfrm4_mode_transport.c +++ b/net/ipv4/xfrm4_mode_transport.c @@ -35,28 +35,6 @@ static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) return 0; } -/* Remove encapsulation header. - * - * The IP header will be moved over the top of the encapsulation header. - * - * On entry, skb->h shall point to where the IP header should be and skb->nh - * shall be set to where the IP header currently is. skb->data shall point - * to the start of the payload. - */ -static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) -{ - int ihl = skb->data - skb_transport_header(skb); - - if (skb->transport_header != skb->network_header) { - memmove(skb_transport_header(skb), - skb_network_header(skb), ihl); - skb->network_header = skb->transport_header; - } - ip_hdr(skb)->tot_len = htons(skb->len + ihl); - skb_reset_transport_header(skb); - return 0; -} - static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) @@ -87,7 +65,6 @@ static void xfrm4_transport_xmit(struct xfrm_state *x, struct sk_buff *skb) } static struct xfrm_mode xfrm4_transport_mode = { - .input = xfrm4_transport_input, .output = xfrm4_transport_output, .gso_segment = xfrm4_transport_gso_segment, .xmit = xfrm4_transport_xmit, diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c index cfc6b6d39755..678b91754b5e 100644 --- a/net/ipv4/xfrm4_mode_tunnel.c +++ b/net/ipv4/xfrm4_mode_tunnel.c @@ -123,7 +123,6 @@ static void xfrm4_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb) static struct xfrm_mode xfrm4_tunnel_mode = { .input2 = xfrm4_mode_tunnel_input, - .input = xfrm_prepare_input, .output2 = xfrm4_mode_tunnel_output, .output = xfrm4_prepare_output, .gso_segment = xfrm4_mode_tunnel_gso_segment, diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c index 0d440e3a13f8..eadacaddfcae 100644 --- a/net/ipv6/xfrm6_mode_beet.c +++ b/net/ipv6/xfrm6_mode_beet.c @@ -104,7 +104,6 @@ out: static struct xfrm_mode xfrm6_beet_mode = { .input2 = xfrm6_beet_input, - .input = xfrm_prepare_input, .output2 = xfrm6_beet_output, .output = xfrm6_prepare_output, .owner = THIS_MODULE, diff --git a/net/ipv6/xfrm6_mode_transport.c b/net/ipv6/xfrm6_mode_transport.c index 66ae79218bdf..4c306bb99284 100644 --- a/net/ipv6/xfrm6_mode_transport.c +++ b/net/ipv6/xfrm6_mode_transport.c @@ -40,29 +40,6 @@ static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb) return 0; } -/* Remove encapsulation header. - * - * The IP header will be moved over the top of the encapsulation header. - * - * On entry, skb->h shall point to where the IP header should be and skb->nh - * shall be set to where the IP header currently is. skb->data shall point - * to the start of the payload. - */ -static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) -{ - int ihl = skb->data - skb_transport_header(skb); - - if (skb->transport_header != skb->network_header) { - memmove(skb_transport_header(skb), - skb_network_header(skb), ihl); - skb->network_header = skb->transport_header; - } - ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - - sizeof(struct ipv6hdr)); - skb_reset_transport_header(skb); - return 0; -} - static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) @@ -92,9 +69,7 @@ static void xfrm6_transport_xmit(struct xfrm_state *x, struct sk_buff *skb) } } - static struct xfrm_mode xfrm6_transport_mode = { - .input = xfrm6_transport_input, .output = xfrm6_transport_output, .gso_segment = xfrm4_transport_gso_segment, .xmit = xfrm6_transport_xmit, diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c index 6cf12e961ea5..1e9677fd6559 100644 --- a/net/ipv6/xfrm6_mode_tunnel.c +++ b/net/ipv6/xfrm6_mode_tunnel.c @@ -122,7 +122,6 @@ static void xfrm6_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb) static struct xfrm_mode xfrm6_tunnel_mode = { .input2 = xfrm6_mode_tunnel_input, - .input = xfrm_prepare_input, .output2 = xfrm6_mode_tunnel_output, .output = xfrm6_prepare_output, .gso_segment = xfrm6_mode_tunnel_gso_segment, diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index ea5ac053c15d..0edf3fb73585 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -166,7 +166,7 @@ int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) } EXPORT_SYMBOL(xfrm_parse_spi); -int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) +static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) { struct xfrm_mode *inner_mode = x->inner_mode; int err; @@ -184,7 +184,76 @@ int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) skb->protocol = inner_mode->afinfo->eth_proto; return inner_mode->input2(x, skb); } -EXPORT_SYMBOL(xfrm_prepare_input); + +/* Remove encapsulation header. + * + * The IP header will be moved over the top of the encapsulation header. + * + * On entry, skb_transport_header() shall point to where the IP header + * should be and skb_network_header() shall be set to where the IP header + * currently is. skb->data shall point to the start of the payload. + */ +static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_INET_XFRM_MODE_TRANSPORT) + int ihl = skb->data - skb_transport_header(skb); + + if (skb->transport_header != skb->network_header) { + memmove(skb_transport_header(skb), + skb_network_header(skb), ihl); + skb->network_header = skb->transport_header; + } + ip_hdr(skb)->tot_len = htons(skb->len + ihl); + skb_reset_transport_header(skb); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_INET6_XFRM_MODE_TRANSPORT) + int ihl = skb->data - skb_transport_header(skb); + + if (skb->transport_header != skb->network_header) { + memmove(skb_transport_header(skb), + skb_network_header(skb), ihl); + skb->network_header = skb->transport_header; + } + ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - + sizeof(struct ipv6hdr)); + skb_reset_transport_header(skb); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int xfrm_inner_mode_input(struct xfrm_state *x, + const struct xfrm_mode *inner_mode, + struct sk_buff *skb) +{ + switch (inner_mode->encap) { + case XFRM_MODE_BEET: + case XFRM_MODE_TUNNEL: + return xfrm_prepare_input(x, skb); + case XFRM_MODE_TRANSPORT: + if (inner_mode->family == AF_INET) + return xfrm4_transport_input(x, skb); + if (inner_mode->family == AF_INET6) + return xfrm6_transport_input(x, skb); + break; + case XFRM_MODE_ROUTEOPTIMIZATION: + WARN_ON_ONCE(1); + break; + default: + WARN_ON_ONCE(1); + break; + } + + return -EOPNOTSUPP; +} int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) { @@ -410,7 +479,7 @@ resume: } } - if (inner_mode->input(x, skb)) { + if (xfrm_inner_mode_input(x, inner_mode, skb)) { XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); goto drop; } -- cgit v1.2.3-59-g8ed1b