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>
This commit is contained in:
Florian Westphal
Steffen Klassert
parent
b3284df1c8
commit
1de7083006
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@ -423,19 +423,6 @@ int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned sh
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int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
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struct xfrm_mode {
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/*
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* Add encapsulation header.
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*
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* On exit, the transport header will be set to the start of the
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* encapsulation header to be filled in by x->type->output and
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* the mac header will be set to the nextheader (protocol for
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* IPv4) field of the extension header directly preceding the
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* encapsulation header, or in its absence, that of the top IP
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* header. The value of the network header will always point
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* to the top IP header while skb->data will point to the payload.
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*/
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int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
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struct xfrm_state_afinfo *afinfo;
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struct module *owner;
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u8 encap;
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@ -17,71 +17,8 @@
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#include <net/ip.h>
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#include <net/xfrm.h>
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static void xfrm4_beet_make_header(struct sk_buff *skb)
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{
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struct iphdr *iph = ip_hdr(skb);
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iph->ihl = 5;
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iph->version = 4;
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iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
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iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
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iph->id = XFRM_MODE_SKB_CB(skb)->id;
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iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
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iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
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}
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/* Add encapsulation header.
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*
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* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
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*/
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static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ip_beet_phdr *ph;
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struct iphdr *top_iph;
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int hdrlen, optlen;
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hdrlen = 0;
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optlen = XFRM_MODE_SKB_CB(skb)->optlen;
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if (unlikely(optlen))
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hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
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skb_set_network_header(skb, -x->props.header_len -
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hdrlen + (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph)));
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if (x->sel.family != AF_INET6)
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skb->network_header += IPV4_BEET_PHMAXLEN;
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skb->mac_header = skb->network_header +
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offsetof(struct iphdr, protocol);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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xfrm4_beet_make_header(skb);
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ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
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top_iph = ip_hdr(skb);
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if (unlikely(optlen)) {
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BUG_ON(optlen < 0);
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ph->padlen = 4 - (optlen & 4);
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ph->hdrlen = optlen / 8;
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ph->nexthdr = top_iph->protocol;
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if (ph->padlen)
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memset(ph + 1, IPOPT_NOP, ph->padlen);
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top_iph->protocol = IPPROTO_BEETPH;
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top_iph->ihl = sizeof(struct iphdr) / 4;
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}
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top_iph->saddr = x->props.saddr.a4;
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top_iph->daddr = x->id.daddr.a4;
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return 0;
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}
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static struct xfrm_mode xfrm4_beet_mode = {
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.output2 = xfrm4_beet_output,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_BEET,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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@ -15,56 +15,7 @@
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#include <net/ip.h>
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#include <net/xfrm.h>
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/* Add encapsulation header.
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*
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* The top IP header will be constructed per RFC 2401.
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*/
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static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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struct iphdr *top_iph;
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int flags;
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skb_set_inner_network_header(skb, skb_network_offset(skb));
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skb_set_inner_transport_header(skb, skb_transport_offset(skb));
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skb_set_network_header(skb, -x->props.header_len);
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skb->mac_header = skb->network_header +
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offsetof(struct iphdr, protocol);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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top_iph = ip_hdr(skb);
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top_iph->ihl = 5;
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top_iph->version = 4;
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top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
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/* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */
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if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
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top_iph->tos = 0;
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else
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top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
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top_iph->tos = INET_ECN_encapsulate(top_iph->tos,
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XFRM_MODE_SKB_CB(skb)->tos);
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flags = x->props.flags;
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if (flags & XFRM_STATE_NOECN)
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IP_ECN_clear(top_iph);
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top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
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0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
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top_iph->ttl = ip4_dst_hoplimit(xfrm_dst_child(dst));
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top_iph->saddr = x->props.saddr.a4;
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top_iph->daddr = x->id.daddr.a4;
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ip_select_ident(dev_net(dst->dev), skb, NULL);
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return 0;
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}
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static struct xfrm_mode xfrm4_tunnel_mode = {
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.output2 = xfrm4_mode_tunnel_output,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_TUNNEL,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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@ -19,65 +19,7 @@
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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static void xfrm6_beet_make_header(struct sk_buff *skb)
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{
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struct ipv6hdr *iph = ipv6_hdr(skb);
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iph->version = 6;
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memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
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sizeof(iph->flow_lbl));
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iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
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ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
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iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
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}
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/* Add encapsulation header.
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*
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* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
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*/
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static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *top_iph;
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struct ip_beet_phdr *ph;
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int optlen, hdr_len;
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hdr_len = 0;
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optlen = XFRM_MODE_SKB_CB(skb)->optlen;
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if (unlikely(optlen))
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hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4);
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skb_set_network_header(skb, -x->props.header_len - hdr_len);
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if (x->sel.family != AF_INET6)
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skb->network_header += IPV4_BEET_PHMAXLEN;
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skb->mac_header = skb->network_header +
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offsetof(struct ipv6hdr, nexthdr);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len);
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xfrm6_beet_make_header(skb);
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top_iph = ipv6_hdr(skb);
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if (unlikely(optlen)) {
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BUG_ON(optlen < 0);
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ph->padlen = 4 - (optlen & 4);
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ph->hdrlen = optlen / 8;
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ph->nexthdr = top_iph->nexthdr;
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if (ph->padlen)
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memset(ph + 1, IPOPT_NOP, ph->padlen);
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top_iph->nexthdr = IPPROTO_BEETPH;
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}
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top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
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top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
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return 0;
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}
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static struct xfrm_mode xfrm6_beet_mode = {
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.output2 = xfrm6_beet_output,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_BEET,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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@ -22,43 +22,7 @@
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*
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* The top IP header will be constructed per RFC 2401.
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*/
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static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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struct ipv6hdr *top_iph;
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int dsfield;
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skb_set_inner_network_header(skb, skb_network_offset(skb));
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skb_set_inner_transport_header(skb, skb_transport_offset(skb));
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skb_set_network_header(skb, -x->props.header_len);
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skb->mac_header = skb->network_header +
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offsetof(struct ipv6hdr, nexthdr);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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top_iph = ipv6_hdr(skb);
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top_iph->version = 6;
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memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
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sizeof(top_iph->flow_lbl));
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top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
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if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
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dsfield = 0;
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else
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dsfield = XFRM_MODE_SKB_CB(skb)->tos;
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dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
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if (x->props.flags & XFRM_STATE_NOECN)
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dsfield &= ~INET_ECN_MASK;
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ipv6_change_dsfield(top_iph, 0, dsfield);
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top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst));
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top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
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top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
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return 0;
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}
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static struct xfrm_mode xfrm6_tunnel_mode = {
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.output2 = xfrm6_mode_tunnel_output,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_TUNNEL,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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@ -17,8 +17,11 @@
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <net/dst.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include "xfrm_inout.h"
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static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb);
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static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
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@ -141,6 +144,190 @@ static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
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#endif
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}
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/* Add encapsulation header.
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*
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* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
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*/
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static int xfrm4_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ip_beet_phdr *ph;
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struct iphdr *top_iph;
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int hdrlen, optlen;
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hdrlen = 0;
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optlen = XFRM_MODE_SKB_CB(skb)->optlen;
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if (unlikely(optlen))
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hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
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skb_set_network_header(skb, -x->props.header_len - hdrlen +
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(XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph)));
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if (x->sel.family != AF_INET6)
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skb->network_header += IPV4_BEET_PHMAXLEN;
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skb->mac_header = skb->network_header +
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offsetof(struct iphdr, protocol);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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xfrm4_beet_make_header(skb);
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ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
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top_iph = ip_hdr(skb);
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if (unlikely(optlen)) {
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if (WARN_ON(optlen < 0))
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return -EINVAL;
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ph->padlen = 4 - (optlen & 4);
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ph->hdrlen = optlen / 8;
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ph->nexthdr = top_iph->protocol;
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if (ph->padlen)
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memset(ph + 1, IPOPT_NOP, ph->padlen);
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top_iph->protocol = IPPROTO_BEETPH;
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top_iph->ihl = sizeof(struct iphdr) / 4;
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}
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top_iph->saddr = x->props.saddr.a4;
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top_iph->daddr = x->id.daddr.a4;
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return 0;
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}
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/* Add encapsulation header.
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*
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* The top IP header will be constructed per RFC 2401.
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*/
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static int xfrm4_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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struct iphdr *top_iph;
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int flags;
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skb_set_inner_network_header(skb, skb_network_offset(skb));
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skb_set_inner_transport_header(skb, skb_transport_offset(skb));
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skb_set_network_header(skb, -x->props.header_len);
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skb->mac_header = skb->network_header +
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offsetof(struct iphdr, protocol);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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top_iph = ip_hdr(skb);
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top_iph->ihl = 5;
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top_iph->version = 4;
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top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
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/* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */
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if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
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top_iph->tos = 0;
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else
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top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
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top_iph->tos = INET_ECN_encapsulate(top_iph->tos,
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XFRM_MODE_SKB_CB(skb)->tos);
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flags = x->props.flags;
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if (flags & XFRM_STATE_NOECN)
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IP_ECN_clear(top_iph);
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top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
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0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
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top_iph->ttl = ip4_dst_hoplimit(xfrm_dst_child(dst));
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top_iph->saddr = x->props.saddr.a4;
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top_iph->daddr = x->id.daddr.a4;
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ip_select_ident(dev_net(dst->dev), skb, NULL);
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return 0;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static int xfrm6_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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struct ipv6hdr *top_iph;
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int dsfield;
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skb_set_inner_network_header(skb, skb_network_offset(skb));
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skb_set_inner_transport_header(skb, skb_transport_offset(skb));
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skb_set_network_header(skb, -x->props.header_len);
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skb->mac_header = skb->network_header +
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offsetof(struct ipv6hdr, nexthdr);
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skb->transport_header = skb->network_header + sizeof(*top_iph);
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top_iph = ipv6_hdr(skb);
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top_iph->version = 6;
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|
||||
memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
|
||||
sizeof(top_iph->flow_lbl));
|
||||
top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
|
||||
|
||||
if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
|
||||
dsfield = 0;
|
||||
else
|
||||
dsfield = XFRM_MODE_SKB_CB(skb)->tos;
|
||||
dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
|
||||
if (x->props.flags & XFRM_STATE_NOECN)
|
||||
dsfield &= ~INET_ECN_MASK;
|
||||
ipv6_change_dsfield(top_iph, 0, dsfield);
|
||||
top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst));
|
||||
top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
|
||||
top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xfrm6_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb)
|
||||
{
|
||||
struct ipv6hdr *top_iph;
|
||||
struct ip_beet_phdr *ph;
|
||||
int optlen, hdr_len;
|
||||
|
||||
hdr_len = 0;
|
||||
optlen = XFRM_MODE_SKB_CB(skb)->optlen;
|
||||
if (unlikely(optlen))
|
||||
hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4);
|
||||
|
||||
skb_set_network_header(skb, -x->props.header_len - hdr_len);
|
||||
if (x->sel.family != AF_INET6)
|
||||
skb->network_header += IPV4_BEET_PHMAXLEN;
|
||||
skb->mac_header = skb->network_header +
|
||||
offsetof(struct ipv6hdr, nexthdr);
|
||||
skb->transport_header = skb->network_header + sizeof(*top_iph);
|
||||
ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len);
|
||||
|
||||
xfrm6_beet_make_header(skb);
|
||||
|
||||
top_iph = ipv6_hdr(skb);
|
||||
if (unlikely(optlen)) {
|
||||
if (WARN_ON(optlen < 0))
|
||||
return -EINVAL;
|
||||
|
||||
ph->padlen = 4 - (optlen & 4);
|
||||
ph->hdrlen = optlen / 8;
|
||||
ph->nexthdr = top_iph->nexthdr;
|
||||
if (ph->padlen)
|
||||
memset(ph + 1, IPOPT_NOP, ph->padlen);
|
||||
|
||||
top_iph->nexthdr = IPPROTO_BEETPH;
|
||||
}
|
||||
|
||||
top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
|
||||
top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Add encapsulation header.
|
||||
*
|
||||
* On exit, the transport header will be set to the start of the
|
||||
* encapsulation header to be filled in by x->type->output and the mac
|
||||
* header will be set to the nextheader (protocol for IPv4) field of the
|
||||
* extension header directly preceding the encapsulation header, or in
|
||||
* its absence, that of the top IP header.
|
||||
* The value of the network header will always point to the top IP header
|
||||
* while skb->data will point to the payload.
|
||||
*/
|
||||
static int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
|
||||
{
|
||||
int err;
|
||||
|
|
@ -152,7 +339,15 @@ static int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
|
|||
IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
|
||||
skb->protocol = htons(ETH_P_IP);
|
||||
|
||||
return x->outer_mode->output2(x, skb);
|
||||
switch (x->outer_mode->encap) {
|
||||
case XFRM_MODE_BEET:
|
||||
return xfrm4_beet_encap_add(x, skb);
|
||||
case XFRM_MODE_TUNNEL:
|
||||
return xfrm4_tunnel_encap_add(x, skb);
|
||||
}
|
||||
|
||||
WARN_ON_ONCE(1);
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
|
||||
|
|
@ -167,11 +362,18 @@ static int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
|
|||
skb->ignore_df = 1;
|
||||
skb->protocol = htons(ETH_P_IPV6);
|
||||
|
||||
return x->outer_mode->output2(x, skb);
|
||||
#else
|
||||
WARN_ON_ONCE(1);
|
||||
return -EOPNOTSUPP;
|
||||
switch (x->outer_mode->encap) {
|
||||
case XFRM_MODE_BEET:
|
||||
return xfrm6_beet_encap_add(x, skb);
|
||||
case XFRM_MODE_TUNNEL:
|
||||
return xfrm6_tunnel_encap_add(x, skb);
|
||||
default:
|
||||
WARN_ON_ONCE(1);
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
#endif
|
||||
WARN_ON_ONCE(1);
|
||||
return -EAFNOSUPPORT;
|
||||
}
|
||||
|
||||
static int xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb)
|
||||
|
|
|
|||
Loading…
Reference in New Issue