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![Jakub Kicinski](/assets/img/avatar_default.png)
Merge in fixes directly in prep for the 5.17 merge window. No conflicts. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
909 lines
21 KiB
C
909 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* xfrm_output.c - Common IPsec encapsulation code.
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*
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* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/netfilter.h>
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#include <linux/skbuff.h>
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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/icmp.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ip6_route.h>
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#include <net/ipv6_stubs.h>
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#endif
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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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static int xfrm_skb_check_space(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev)
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- skb_headroom(skb);
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int ntail = dst->dev->needed_tailroom - skb_tailroom(skb);
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if (nhead <= 0) {
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if (ntail <= 0)
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return 0;
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nhead = 0;
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} else if (ntail < 0)
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ntail = 0;
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return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
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}
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/* Children define the path of the packet through the
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* Linux networking. Thus, destinations are stackable.
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*/
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static struct dst_entry *skb_dst_pop(struct sk_buff *skb)
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{
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struct dst_entry *child = dst_clone(xfrm_dst_child(skb_dst(skb)));
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skb_dst_drop(skb);
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return child;
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}
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/* Add encapsulation header.
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*
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* The IP header will be moved forward to make space for the encapsulation
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* header.
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*/
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static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct iphdr *iph = ip_hdr(skb);
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int ihl = iph->ihl * 4;
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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 + ihl;
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__skb_pull(skb, ihl);
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memmove(skb_network_header(skb), iph, ihl);
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return 0;
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}
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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static int mip6_rthdr_offset(struct sk_buff *skb, u8 **nexthdr, int type)
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{
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const unsigned char *nh = skb_network_header(skb);
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unsigned int offset = sizeof(struct ipv6hdr);
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unsigned int packet_len;
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int found_rhdr = 0;
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packet_len = skb_tail_pointer(skb) - nh;
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*nexthdr = &ipv6_hdr(skb)->nexthdr;
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while (offset <= packet_len) {
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struct ipv6_opt_hdr *exthdr;
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switch (**nexthdr) {
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case NEXTHDR_HOP:
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break;
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case NEXTHDR_ROUTING:
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if (type == IPPROTO_ROUTING && offset + 3 <= packet_len) {
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struct ipv6_rt_hdr *rt;
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rt = (struct ipv6_rt_hdr *)(nh + offset);
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if (rt->type != 0)
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return offset;
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}
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found_rhdr = 1;
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break;
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case NEXTHDR_DEST:
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/* HAO MUST NOT appear more than once.
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* XXX: It is better to try to find by the end of
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* XXX: packet if HAO exists.
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*/
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if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
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net_dbg_ratelimited("mip6: hao exists already, override\n");
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return offset;
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}
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if (found_rhdr)
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return offset;
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break;
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default:
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return offset;
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}
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if (offset + sizeof(struct ipv6_opt_hdr) > packet_len)
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return -EINVAL;
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exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
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offset);
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offset += ipv6_optlen(exthdr);
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if (offset > IPV6_MAXPLEN)
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return -EINVAL;
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*nexthdr = &exthdr->nexthdr;
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}
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return -EINVAL;
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}
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#endif
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#if IS_ENABLED(CONFIG_IPV6)
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static int xfrm6_hdr_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **prevhdr)
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{
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switch (x->type->proto) {
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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case IPPROTO_DSTOPTS:
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case IPPROTO_ROUTING:
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return mip6_rthdr_offset(skb, prevhdr, x->type->proto);
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#endif
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default:
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break;
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}
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return ip6_find_1stfragopt(skb, prevhdr);
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}
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#endif
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/* Add encapsulation header.
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*
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* The IP header and mutable extension headers will be moved forward to make
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* space for the encapsulation header.
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*/
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static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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struct ipv6hdr *iph;
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u8 *prevhdr;
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int hdr_len;
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iph = ipv6_hdr(skb);
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skb_set_inner_transport_header(skb, skb_transport_offset(skb));
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hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr);
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if (hdr_len < 0)
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return hdr_len;
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skb_set_mac_header(skb,
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(prevhdr - x->props.header_len) - skb->data);
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skb_set_network_header(skb, -x->props.header_len);
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skb->transport_header = skb->network_header + hdr_len;
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__skb_pull(skb, hdr_len);
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memmove(ipv6_hdr(skb), iph, hdr_len);
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return 0;
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#else
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WARN_ON_ONCE(1);
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return -EAFNOSUPPORT;
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#endif
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}
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/* Add route optimization header space.
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*
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* The IP header and mutable extension headers will be moved forward to make
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* space for the route optimization header.
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*/
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static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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struct ipv6hdr *iph;
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u8 *prevhdr;
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int hdr_len;
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iph = ipv6_hdr(skb);
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hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr);
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if (hdr_len < 0)
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return hdr_len;
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skb_set_mac_header(skb,
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(prevhdr - x->props.header_len) - skb->data);
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skb_set_network_header(skb, -x->props.header_len);
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skb->transport_header = skb->network_header + hdr_len;
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__skb_pull(skb, hdr_len);
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memmove(ipv6_hdr(skb), iph, hdr_len);
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x->lastused = ktime_get_real_seconds();
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return 0;
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#else
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WARN_ON_ONCE(1);
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return -EAFNOSUPPORT;
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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,
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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 int xfrm6_beet_encap_add(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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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->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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#endif
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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 the mac
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* header will be set to the nextheader (protocol for IPv4) field of the
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* extension header directly preceding the encapsulation header, or in
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* its absence, that of the top IP header.
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* The value of the network header will always point to the top IP header
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* while skb->data will point to the payload.
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*/
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static int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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err = xfrm_inner_extract_output(x, skb);
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if (err)
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return err;
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IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
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skb->protocol = htons(ETH_P_IP);
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switch (x->outer_mode.encap) {
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case XFRM_MODE_BEET:
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return xfrm4_beet_encap_add(x, skb);
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case XFRM_MODE_TUNNEL:
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return xfrm4_tunnel_encap_add(x, skb);
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}
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WARN_ON_ONCE(1);
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return -EOPNOTSUPP;
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}
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static int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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int err;
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err = xfrm_inner_extract_output(x, skb);
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if (err)
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return err;
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skb->ignore_df = 1;
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skb->protocol = htons(ETH_P_IPV6);
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switch (x->outer_mode.encap) {
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case XFRM_MODE_BEET:
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return xfrm6_beet_encap_add(x, skb);
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case XFRM_MODE_TUNNEL:
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return xfrm6_tunnel_encap_add(x, skb);
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default:
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WARN_ON_ONCE(1);
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return -EOPNOTSUPP;
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}
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#endif
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WARN_ON_ONCE(1);
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return -EAFNOSUPPORT;
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}
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static int xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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switch (x->outer_mode.encap) {
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case XFRM_MODE_BEET:
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case XFRM_MODE_TUNNEL:
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if (x->outer_mode.family == AF_INET)
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return xfrm4_prepare_output(x, skb);
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if (x->outer_mode.family == AF_INET6)
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return xfrm6_prepare_output(x, skb);
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break;
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case XFRM_MODE_TRANSPORT:
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if (x->outer_mode.family == AF_INET)
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return xfrm4_transport_output(x, skb);
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if (x->outer_mode.family == AF_INET6)
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return xfrm6_transport_output(x, skb);
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break;
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case XFRM_MODE_ROUTEOPTIMIZATION:
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if (x->outer_mode.family == AF_INET6)
|
|
return xfrm6_ro_output(x, skb);
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NET_PKTGEN)
|
|
int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
return xfrm_outer_mode_output(x, skb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pktgen_xfrm_outer_mode_output);
|
|
#endif
|
|
|
|
static int xfrm_output_one(struct sk_buff *skb, int err)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct xfrm_state *x = dst->xfrm;
|
|
struct net *net = xs_net(x);
|
|
|
|
if (err <= 0)
|
|
goto resume;
|
|
|
|
do {
|
|
err = xfrm_skb_check_space(skb);
|
|
if (err) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
|
|
goto error_nolock;
|
|
}
|
|
|
|
skb->mark = xfrm_smark_get(skb->mark, x);
|
|
|
|
err = xfrm_outer_mode_output(x, skb);
|
|
if (err) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
|
|
goto error_nolock;
|
|
}
|
|
|
|
spin_lock_bh(&x->lock);
|
|
|
|
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID);
|
|
err = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
err = xfrm_state_check_expire(x);
|
|
if (err) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED);
|
|
goto error;
|
|
}
|
|
|
|
err = xfrm_replay_overflow(x, skb);
|
|
if (err) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
|
|
goto error;
|
|
}
|
|
|
|
x->curlft.bytes += skb->len;
|
|
x->curlft.packets++;
|
|
x->curlft.use_time = ktime_get_real_seconds();
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
skb_dst_force(skb);
|
|
if (!skb_dst(skb)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
|
|
err = -EHOSTUNREACH;
|
|
goto error_nolock;
|
|
}
|
|
|
|
if (xfrm_offload(skb)) {
|
|
x->type_offload->encap(x, skb);
|
|
} else {
|
|
/* Inner headers are invalid now. */
|
|
skb->encapsulation = 0;
|
|
|
|
err = x->type->output(x, skb);
|
|
if (err == -EINPROGRESS)
|
|
goto out;
|
|
}
|
|
|
|
resume:
|
|
if (err) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
|
|
goto error_nolock;
|
|
}
|
|
|
|
dst = skb_dst_pop(skb);
|
|
if (!dst) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
|
|
err = -EHOSTUNREACH;
|
|
goto error_nolock;
|
|
}
|
|
skb_dst_set(skb, dst);
|
|
x = dst->xfrm;
|
|
} while (x && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL));
|
|
|
|
return 0;
|
|
|
|
error:
|
|
spin_unlock_bh(&x->lock);
|
|
error_nolock:
|
|
kfree_skb(skb);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err)
|
|
{
|
|
struct net *net = xs_net(skb_dst(skb)->xfrm);
|
|
|
|
while (likely((err = xfrm_output_one(skb, err)) == 0)) {
|
|
nf_reset_ct(skb);
|
|
|
|
err = skb_dst(skb)->ops->local_out(net, sk, skb);
|
|
if (unlikely(err != 1))
|
|
goto out;
|
|
|
|
if (!skb_dst(skb)->xfrm)
|
|
return dst_output(net, sk, skb);
|
|
|
|
err = nf_hook(skb_dst(skb)->ops->family,
|
|
NF_INET_POST_ROUTING, net, sk, skb,
|
|
NULL, skb_dst(skb)->dev, xfrm_output2);
|
|
if (unlikely(err != 1))
|
|
goto out;
|
|
}
|
|
|
|
if (err == -EINPROGRESS)
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_output_resume);
|
|
|
|
static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return xfrm_output_resume(sk, skb, 1);
|
|
}
|
|
|
|
static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *segs, *nskb;
|
|
|
|
BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_GSO_CB_OFFSET);
|
|
BUILD_BUG_ON(sizeof(*IP6CB(skb)) > SKB_GSO_CB_OFFSET);
|
|
segs = skb_gso_segment(skb, 0);
|
|
kfree_skb(skb);
|
|
if (IS_ERR(segs))
|
|
return PTR_ERR(segs);
|
|
if (segs == NULL)
|
|
return -EINVAL;
|
|
|
|
skb_list_walk_safe(segs, segs, nskb) {
|
|
int err;
|
|
|
|
skb_mark_not_on_list(segs);
|
|
err = xfrm_output2(net, sk, segs);
|
|
|
|
if (unlikely(err)) {
|
|
kfree_skb_list(nskb);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* For partial checksum offload, the outer header checksum is calculated
|
|
* by software and the inner header checksum is calculated by hardware.
|
|
* This requires hardware to know the inner packet type to calculate
|
|
* the inner header checksum. Save inner ip protocol here to avoid
|
|
* traversing the packet in the vendor's xmit code.
|
|
* For IPsec tunnel mode save the ip protocol from the IP header of the
|
|
* plain text packet. Otherwise If the encap type is IPIP, just save
|
|
* skb->inner_ipproto in any other case get the ip protocol from the IP
|
|
* header.
|
|
*/
|
|
static void xfrm_get_inner_ipproto(struct sk_buff *skb, struct xfrm_state *x)
|
|
{
|
|
struct xfrm_offload *xo = xfrm_offload(skb);
|
|
const struct ethhdr *eth;
|
|
|
|
if (!xo)
|
|
return;
|
|
|
|
if (x->outer_mode.encap == XFRM_MODE_TUNNEL) {
|
|
switch (x->outer_mode.family) {
|
|
case AF_INET:
|
|
xo->inner_ipproto = ip_hdr(skb)->protocol;
|
|
break;
|
|
case AF_INET6:
|
|
xo->inner_ipproto = ipv6_hdr(skb)->nexthdr;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* non-Tunnel Mode */
|
|
if (!skb->encapsulation)
|
|
return;
|
|
|
|
if (skb->inner_protocol_type == ENCAP_TYPE_IPPROTO) {
|
|
xo->inner_ipproto = skb->inner_ipproto;
|
|
return;
|
|
}
|
|
|
|
if (skb->inner_protocol_type != ENCAP_TYPE_ETHER)
|
|
return;
|
|
|
|
eth = (struct ethhdr *)skb_inner_mac_header(skb);
|
|
|
|
switch (ntohs(eth->h_proto)) {
|
|
case ETH_P_IPV6:
|
|
xo->inner_ipproto = inner_ipv6_hdr(skb)->nexthdr;
|
|
break;
|
|
case ETH_P_IP:
|
|
xo->inner_ipproto = inner_ip_hdr(skb)->protocol;
|
|
break;
|
|
}
|
|
}
|
|
|
|
int xfrm_output(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct net *net = dev_net(skb_dst(skb)->dev);
|
|
struct xfrm_state *x = skb_dst(skb)->xfrm;
|
|
int err;
|
|
|
|
switch (x->outer_mode.family) {
|
|
case AF_INET:
|
|
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
|
|
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
|
|
break;
|
|
case AF_INET6:
|
|
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
|
|
|
|
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
|
|
break;
|
|
}
|
|
|
|
secpath_reset(skb);
|
|
|
|
if (xfrm_dev_offload_ok(skb, x)) {
|
|
struct sec_path *sp;
|
|
|
|
sp = secpath_set(skb);
|
|
if (!sp) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
|
|
kfree_skb(skb);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sp->olen++;
|
|
sp->xvec[sp->len++] = x;
|
|
xfrm_state_hold(x);
|
|
|
|
xfrm_get_inner_ipproto(skb, x);
|
|
skb->encapsulation = 1;
|
|
|
|
if (skb_is_gso(skb)) {
|
|
if (skb->inner_protocol)
|
|
return xfrm_output_gso(net, sk, skb);
|
|
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_ESP;
|
|
goto out;
|
|
}
|
|
|
|
if (x->xso.dev && x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM)
|
|
goto out;
|
|
} else {
|
|
if (skb_is_gso(skb))
|
|
return xfrm_output_gso(net, sk, skb);
|
|
}
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
err = skb_checksum_help(skb);
|
|
if (err) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return xfrm_output2(net, sk, skb);
|
|
}
|
|
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;
|
|
|
|
if (x->outer_mode.encap == XFRM_MODE_BEET &&
|
|
ip_is_fragment(ip_hdr(skb))) {
|
|
net_warn_ratelimited("BEET mode doesn't support inner IPv4 fragments\n");
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int xfrm6_tunnel_check_size(struct sk_buff *skb)
|
|
{
|
|
int mtu, ret = 0;
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
|
|
if (skb->ignore_df)
|
|
goto out;
|
|
|
|
mtu = dst_mtu(dst);
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
|
|
if ((!skb_is_gso(skb) && skb->len > mtu) ||
|
|
(skb_is_gso(skb) &&
|
|
!skb_gso_validate_network_len(skb, ip6_skb_dst_mtu(skb)))) {
|
|
skb->dev = dst->dev;
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
|
|
if (xfrm6_local_dontfrag(skb->sk))
|
|
ipv6_stub->xfrm6_local_rxpmtu(skb, mtu);
|
|
else if (skb->sk)
|
|
xfrm_local_error(skb, mtu);
|
|
else
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
ret = -EMSGSIZE;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
int err;
|
|
|
|
err = xfrm6_tunnel_check_size(skb);
|
|
if (err)
|
|
return err;
|
|
|
|
XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
|
|
|
|
xfrm6_extract_header(skb);
|
|
return 0;
|
|
#else
|
|
WARN_ON_ONCE(1);
|
|
return -EAFNOSUPPORT;
|
|
#endif
|
|
}
|
|
|
|
static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
const struct xfrm_mode *inner_mode;
|
|
|
|
if (x->sel.family == AF_UNSPEC)
|
|
inner_mode = xfrm_ip2inner_mode(x,
|
|
xfrm_af2proto(skb_dst(skb)->ops->family));
|
|
else
|
|
inner_mode = &x->inner_mode;
|
|
|
|
if (inner_mode == NULL)
|
|
return -EAFNOSUPPORT;
|
|
|
|
switch (inner_mode->family) {
|
|
case AF_INET:
|
|
return xfrm4_extract_output(x, skb);
|
|
case AF_INET6:
|
|
return xfrm6_extract_output(x, skb);
|
|
}
|
|
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
void xfrm_local_error(struct sk_buff *skb, int mtu)
|
|
{
|
|
unsigned int proto;
|
|
struct xfrm_state_afinfo *afinfo;
|
|
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
proto = AF_INET;
|
|
else if (skb->protocol == htons(ETH_P_IPV6) &&
|
|
skb->sk->sk_family == AF_INET6)
|
|
proto = AF_INET6;
|
|
else
|
|
return;
|
|
|
|
afinfo = xfrm_state_get_afinfo(proto);
|
|
if (afinfo) {
|
|
afinfo->local_error(skb, mtu);
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_local_error);
|