1 /* 2 * xfrm4_state.c 3 * 4 * Changes: 5 * YOSHIFUJI Hideaki @USAGI 6 * Split up af-specific portion 7 * 8 */ 9 10 #include <net/ip.h> 11 #include <net/xfrm.h> 12 #include <linux/pfkeyv2.h> 13 #include <linux/ipsec.h> 14 #include <linux/netfilter_ipv4.h> 15 16 static struct xfrm_state_afinfo xfrm4_state_afinfo; 17 18 static int xfrm4_init_flags(struct xfrm_state *x) 19 { 20 if (ipv4_config.no_pmtu_disc) 21 x->props.flags |= XFRM_STATE_NOPMTUDISC; 22 return 0; 23 } 24 25 static void 26 __xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl, 27 struct xfrm_tmpl *tmpl, 28 xfrm_address_t *daddr, xfrm_address_t *saddr) 29 { 30 x->sel.daddr.a4 = fl->fl4_dst; 31 x->sel.saddr.a4 = fl->fl4_src; 32 x->sel.dport = xfrm_flowi_dport(fl); 33 x->sel.dport_mask = htons(0xffff); 34 x->sel.sport = xfrm_flowi_sport(fl); 35 x->sel.sport_mask = htons(0xffff); 36 x->sel.prefixlen_d = 32; 37 x->sel.prefixlen_s = 32; 38 x->sel.proto = fl->proto; 39 x->sel.ifindex = fl->oif; 40 x->id = tmpl->id; 41 if (x->id.daddr.a4 == 0) 42 x->id.daddr.a4 = daddr->a4; 43 x->props.saddr = tmpl->saddr; 44 if (x->props.saddr.a4 == 0) 45 x->props.saddr.a4 = saddr->a4; 46 x->props.mode = tmpl->mode; 47 x->props.reqid = tmpl->reqid; 48 x->props.family = AF_INET; 49 } 50 51 int xfrm4_extract_header(struct sk_buff *skb) 52 { 53 struct iphdr *iph = ip_hdr(skb); 54 55 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 56 XFRM_MODE_SKB_CB(skb)->id = iph->id; 57 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; 58 XFRM_MODE_SKB_CB(skb)->tos = iph->tos; 59 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; 60 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); 61 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, 62 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 63 64 return 0; 65 } 66 67 static struct xfrm_state_afinfo xfrm4_state_afinfo = { 68 .family = AF_INET, 69 .proto = IPPROTO_IPIP, 70 .eth_proto = htons(ETH_P_IP), 71 .owner = THIS_MODULE, 72 .init_flags = xfrm4_init_flags, 73 .init_tempsel = __xfrm4_init_tempsel, 74 .output = xfrm4_output, 75 .extract_input = xfrm4_extract_input, 76 .extract_output = xfrm4_extract_output, 77 .transport_finish = xfrm4_transport_finish, 78 }; 79 80 void __init xfrm4_state_init(void) 81 { 82 xfrm_state_register_afinfo(&xfrm4_state_afinfo); 83 } 84 85 #if 0 86 void __exit xfrm4_state_fini(void) 87 { 88 xfrm_state_unregister_afinfo(&xfrm4_state_afinfo); 89 } 90 #endif /* 0 */ 91 92