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 #include <linux/export.h> 16 17 static int xfrm4_init_flags(struct xfrm_state *x) 18 { 19 if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc) 20 x->props.flags |= XFRM_STATE_NOPMTUDISC; 21 return 0; 22 } 23 24 static void 25 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 26 { 27 const struct flowi4 *fl4 = &fl->u.ip4; 28 29 sel->daddr.a4 = fl4->daddr; 30 sel->saddr.a4 = fl4->saddr; 31 sel->dport = xfrm_flowi_dport(fl, &fl4->uli); 32 sel->dport_mask = htons(0xffff); 33 sel->sport = xfrm_flowi_sport(fl, &fl4->uli); 34 sel->sport_mask = htons(0xffff); 35 sel->family = AF_INET; 36 sel->prefixlen_d = 32; 37 sel->prefixlen_s = 32; 38 sel->proto = fl4->flowi4_proto; 39 sel->ifindex = fl4->flowi4_oif; 40 } 41 42 static void 43 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl, 44 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 45 { 46 x->id = tmpl->id; 47 if (x->id.daddr.a4 == 0) 48 x->id.daddr.a4 = daddr->a4; 49 x->props.saddr = tmpl->saddr; 50 if (x->props.saddr.a4 == 0) 51 x->props.saddr.a4 = saddr->a4; 52 x->props.mode = tmpl->mode; 53 x->props.reqid = tmpl->reqid; 54 x->props.family = AF_INET; 55 } 56 57 int xfrm4_extract_header(struct sk_buff *skb) 58 { 59 const struct iphdr *iph = ip_hdr(skb); 60 61 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 62 XFRM_MODE_SKB_CB(skb)->id = iph->id; 63 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; 64 XFRM_MODE_SKB_CB(skb)->tos = iph->tos; 65 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; 66 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); 67 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, 68 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 69 70 return 0; 71 } 72 73 static struct xfrm_state_afinfo xfrm4_state_afinfo = { 74 .family = AF_INET, 75 .proto = IPPROTO_IPIP, 76 .eth_proto = htons(ETH_P_IP), 77 .owner = THIS_MODULE, 78 .init_flags = xfrm4_init_flags, 79 .init_tempsel = __xfrm4_init_tempsel, 80 .init_temprop = xfrm4_init_temprop, 81 .output = xfrm4_output, 82 .output_finish = xfrm4_output_finish, 83 .extract_input = xfrm4_extract_input, 84 .extract_output = xfrm4_extract_output, 85 .transport_finish = xfrm4_transport_finish, 86 .local_error = xfrm4_local_error, 87 }; 88 89 void __init xfrm4_state_init(void) 90 { 91 xfrm_state_register_afinfo(&xfrm4_state_afinfo); 92 } 93