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 int xfrm4_init_flags(struct xfrm_state *x) 17 { 18 if (ipv4_config.no_pmtu_disc) 19 x->props.flags |= XFRM_STATE_NOPMTUDISC; 20 return 0; 21 } 22 23 static void 24 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 25 { 26 const struct flowi4 *fl4 = &fl->u.ip4; 27 28 sel->daddr.a4 = fl4->daddr; 29 sel->saddr.a4 = fl4->saddr; 30 sel->dport = xfrm_flowi_dport(fl, &fl4->uli); 31 sel->dport_mask = htons(0xffff); 32 sel->sport = xfrm_flowi_sport(fl, &fl4->uli); 33 sel->sport_mask = htons(0xffff); 34 sel->family = AF_INET; 35 sel->prefixlen_d = 32; 36 sel->prefixlen_s = 32; 37 sel->proto = fl4->flowi4_proto; 38 sel->ifindex = fl4->flowi4_oif; 39 } 40 41 static void 42 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl, 43 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 44 { 45 x->id = tmpl->id; 46 if (x->id.daddr.a4 == 0) 47 x->id.daddr.a4 = daddr->a4; 48 x->props.saddr = tmpl->saddr; 49 if (x->props.saddr.a4 == 0) 50 x->props.saddr.a4 = saddr->a4; 51 x->props.mode = tmpl->mode; 52 x->props.reqid = tmpl->reqid; 53 x->props.family = AF_INET; 54 } 55 56 int xfrm4_extract_header(struct sk_buff *skb) 57 { 58 const struct iphdr *iph = ip_hdr(skb); 59 60 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 61 XFRM_MODE_SKB_CB(skb)->id = iph->id; 62 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; 63 XFRM_MODE_SKB_CB(skb)->tos = iph->tos; 64 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; 65 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); 66 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, 67 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 68 69 return 0; 70 } 71 72 static struct xfrm_state_afinfo xfrm4_state_afinfo = { 73 .family = AF_INET, 74 .proto = IPPROTO_IPIP, 75 .eth_proto = htons(ETH_P_IP), 76 .owner = THIS_MODULE, 77 .init_flags = xfrm4_init_flags, 78 .init_tempsel = __xfrm4_init_tempsel, 79 .init_temprop = xfrm4_init_temprop, 80 .output = xfrm4_output, 81 .output_finish = xfrm4_output_finish, 82 .extract_input = xfrm4_extract_input, 83 .extract_output = xfrm4_extract_output, 84 .transport_finish = xfrm4_transport_finish, 85 }; 86 87 void __init xfrm4_state_init(void) 88 { 89 xfrm_state_register_afinfo(&xfrm4_state_afinfo); 90 } 91 92 #if 0 93 void __exit xfrm4_state_fini(void) 94 { 95 xfrm_state_unregister_afinfo(&xfrm4_state_afinfo); 96 } 97 #endif /* 0 */ 98 99