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 sel->daddr.a4 = fl->fl4_dst; 27 sel->saddr.a4 = fl->fl4_src; 28 sel->dport = xfrm_flowi_dport(fl, &fl->u.ip4.uli); 29 sel->dport_mask = htons(0xffff); 30 sel->sport = xfrm_flowi_sport(fl, &fl->u.ip4.uli); 31 sel->sport_mask = htons(0xffff); 32 sel->family = AF_INET; 33 sel->prefixlen_d = 32; 34 sel->prefixlen_s = 32; 35 sel->proto = fl->flowi_proto; 36 sel->ifindex = fl->flowi_oif; 37 } 38 39 static void 40 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl, 41 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 42 { 43 x->id = tmpl->id; 44 if (x->id.daddr.a4 == 0) 45 x->id.daddr.a4 = daddr->a4; 46 x->props.saddr = tmpl->saddr; 47 if (x->props.saddr.a4 == 0) 48 x->props.saddr.a4 = saddr->a4; 49 x->props.mode = tmpl->mode; 50 x->props.reqid = tmpl->reqid; 51 x->props.family = AF_INET; 52 } 53 54 int xfrm4_extract_header(struct sk_buff *skb) 55 { 56 struct iphdr *iph = ip_hdr(skb); 57 58 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 59 XFRM_MODE_SKB_CB(skb)->id = iph->id; 60 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; 61 XFRM_MODE_SKB_CB(skb)->tos = iph->tos; 62 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; 63 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); 64 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, 65 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 66 67 return 0; 68 } 69 70 static struct xfrm_state_afinfo xfrm4_state_afinfo = { 71 .family = AF_INET, 72 .proto = IPPROTO_IPIP, 73 .eth_proto = htons(ETH_P_IP), 74 .owner = THIS_MODULE, 75 .init_flags = xfrm4_init_flags, 76 .init_tempsel = __xfrm4_init_tempsel, 77 .init_temprop = xfrm4_init_temprop, 78 .output = xfrm4_output, 79 .extract_input = xfrm4_extract_input, 80 .extract_output = xfrm4_extract_output, 81 .transport_finish = xfrm4_transport_finish, 82 }; 83 84 void __init xfrm4_state_init(void) 85 { 86 xfrm_state_register_afinfo(&xfrm4_state_afinfo); 87 } 88 89 #if 0 90 void __exit xfrm4_state_fini(void) 91 { 92 xfrm_state_unregister_afinfo(&xfrm4_state_afinfo); 93 } 94 #endif /* 0 */ 95 96