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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [net/] [ipv6/] [xfrm6_mode_tunnel.c] - Rev 8
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/* * xfrm6_mode_tunnel.c - Tunnel mode encapsulation for IPv6. * * Copyright (C) 2002 USAGI/WIDE Project * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au> */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/skbuff.h> #include <linux/stringify.h> #include <net/dsfield.h> #include <net/dst.h> #include <net/inet_ecn.h> #include <net/ipv6.h> #include <net/xfrm.h> static inline void ipip6_ecn_decapsulate(struct sk_buff *skb) { struct ipv6hdr *outer_iph = ipv6_hdr(skb); struct ipv6hdr *inner_iph = ipipv6_hdr(skb); if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph))) IP6_ECN_set_ce(inner_iph); } static inline void ip6ip_ecn_decapsulate(struct sk_buff *skb) { if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6_hdr(skb)))) IP_ECN_set_ce(ipip_hdr(skb)); } /* Add encapsulation header. * * The top IP header will be constructed per RFC 2401. */ static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb) { struct dst_entry *dst = skb->dst; struct xfrm_dst *xdst = (struct xfrm_dst*)dst; struct ipv6hdr *iph, *top_iph; int dsfield; iph = ipv6_hdr(skb); skb_set_network_header(skb, -x->props.header_len); skb->mac_header = skb->network_header + offsetof(struct ipv6hdr, nexthdr); skb->transport_header = skb->network_header + sizeof(*iph); top_iph = ipv6_hdr(skb); top_iph->version = 6; if (xdst->route->ops->family == AF_INET6) { top_iph->priority = iph->priority; top_iph->flow_lbl[0] = iph->flow_lbl[0]; top_iph->flow_lbl[1] = iph->flow_lbl[1]; top_iph->flow_lbl[2] = iph->flow_lbl[2]; top_iph->nexthdr = IPPROTO_IPV6; } else { top_iph->priority = 0; top_iph->flow_lbl[0] = 0; top_iph->flow_lbl[1] = 0; top_iph->flow_lbl[2] = 0; top_iph->nexthdr = IPPROTO_IPIP; } dsfield = ipv6_get_dsfield(top_iph); dsfield = INET_ECN_encapsulate(dsfield, dsfield); if (x->props.flags & XFRM_STATE_NOECN) dsfield &= ~INET_ECN_MASK; ipv6_change_dsfield(top_iph, 0, dsfield); top_iph->hop_limit = dst_metric(dst->child, RTAX_HOPLIMIT); ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr); ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr); skb->protocol = htons(ETH_P_IPV6); return 0; } static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) { int err = -EINVAL; const unsigned char *old_mac; const unsigned char *nh = skb_network_header(skb); if (nh[IP6CB(skb)->nhoff] != IPPROTO_IPV6 && nh[IP6CB(skb)->nhoff] != IPPROTO_IPIP) goto out; if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) goto out; if (skb_cloned(skb) && (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) goto out; nh = skb_network_header(skb); if (nh[IP6CB(skb)->nhoff] == IPPROTO_IPV6) { if (x->props.flags & XFRM_STATE_DECAP_DSCP) ipv6_copy_dscp(ipv6_hdr(skb), ipipv6_hdr(skb)); if (!(x->props.flags & XFRM_STATE_NOECN)) ipip6_ecn_decapsulate(skb); } else { if (!(x->props.flags & XFRM_STATE_NOECN)) ip6ip_ecn_decapsulate(skb); skb->protocol = htons(ETH_P_IP); } old_mac = skb_mac_header(skb); skb_set_mac_header(skb, -skb->mac_len); memmove(skb_mac_header(skb), old_mac, skb->mac_len); skb_reset_network_header(skb); err = 0; out: return err; } static struct xfrm_mode xfrm6_tunnel_mode = { .input = xfrm6_tunnel_input, .output = xfrm6_tunnel_output, .owner = THIS_MODULE, .encap = XFRM_MODE_TUNNEL, .flags = XFRM_MODE_FLAG_TUNNEL, }; static int __init xfrm6_tunnel_init(void) { return xfrm_register_mode(&xfrm6_tunnel_mode, AF_INET6); } static void __exit xfrm6_tunnel_exit(void) { int err; err = xfrm_unregister_mode(&xfrm6_tunnel_mode, AF_INET6); BUG_ON(err); } module_init(xfrm6_tunnel_init); module_exit(xfrm6_tunnel_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TUNNEL);