1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * xfrm4_state.c 4 * 5 * Changes: 6 * YOSHIFUJI Hideaki @USAGI 7 * Split up af-specific portion 8 * 9 */ 10 11 #include <net/ip.h> 12 #include <net/xfrm.h> 13 #include <linux/pfkeyv2.h> 14 #include <linux/ipsec.h> 15 #include <linux/netfilter_ipv4.h> 16 #include <linux/export.h> 17 18 int xfrm4_extract_header(struct sk_buff *skb) 19 { 20 const struct iphdr *iph = ip_hdr(skb); 21 22 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 23 XFRM_MODE_SKB_CB(skb)->id = iph->id; 24 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; 25 XFRM_MODE_SKB_CB(skb)->tos = iph->tos; 26 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; 27 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); 28 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, 29 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 30 31 return 0; 32 } 33 34 static struct xfrm_state_afinfo xfrm4_state_afinfo = { 35 .family = AF_INET, 36 .proto = IPPROTO_IPIP, 37 .output = xfrm4_output, 38 .output_finish = xfrm4_output_finish, 39 .extract_input = xfrm4_extract_input, 40 .extract_output = xfrm4_extract_output, 41 .transport_finish = xfrm4_transport_finish, 42 .local_error = xfrm4_local_error, 43 }; 44 45 void __init xfrm4_state_init(void) 46 { 47 xfrm_state_register_afinfo(&xfrm4_state_afinfo); 48 } 49