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 static int xfrm4_init_flags(struct xfrm_state *x) 19 { 20 if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc) 21 x->props.flags |= XFRM_STATE_NOPMTUDISC; 22 return 0; 23 } 24 25 static void 26 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 27 { 28 const struct flowi4 *fl4 = &fl->u.ip4; 29 30 sel->daddr.a4 = fl4->daddr; 31 sel->saddr.a4 = fl4->saddr; 32 sel->dport = xfrm_flowi_dport(fl, &fl4->uli); 33 sel->dport_mask = htons(0xffff); 34 sel->sport = xfrm_flowi_sport(fl, &fl4->uli); 35 sel->sport_mask = htons(0xffff); 36 sel->family = AF_INET; 37 sel->prefixlen_d = 32; 38 sel->prefixlen_s = 32; 39 sel->proto = fl4->flowi4_proto; 40 sel->ifindex = fl4->flowi4_oif; 41 } 42 43 static void 44 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl, 45 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 46 { 47 x->id = tmpl->id; 48 if (x->id.daddr.a4 == 0) 49 x->id.daddr.a4 = daddr->a4; 50 x->props.saddr = tmpl->saddr; 51 if (x->props.saddr.a4 == 0) 52 x->props.saddr.a4 = saddr->a4; 53 x->props.mode = tmpl->mode; 54 x->props.reqid = tmpl->reqid; 55 x->props.family = AF_INET; 56 } 57 58 int xfrm4_extract_header(struct sk_buff *skb) 59 { 60 const struct iphdr *iph = ip_hdr(skb); 61 62 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 63 XFRM_MODE_SKB_CB(skb)->id = iph->id; 64 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; 65 XFRM_MODE_SKB_CB(skb)->tos = iph->tos; 66 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; 67 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); 68 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, 69 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 70 71 return 0; 72 } 73 74 static struct xfrm_state_afinfo xfrm4_state_afinfo = { 75 .family = AF_INET, 76 .proto = IPPROTO_IPIP, 77 .eth_proto = htons(ETH_P_IP), 78 .owner = THIS_MODULE, 79 .init_flags = xfrm4_init_flags, 80 .init_tempsel = __xfrm4_init_tempsel, 81 .init_temprop = xfrm4_init_temprop, 82 .output = xfrm4_output, 83 .output_finish = xfrm4_output_finish, 84 .extract_input = xfrm4_extract_input, 85 .extract_output = xfrm4_extract_output, 86 .transport_finish = xfrm4_transport_finish, 87 .local_error = xfrm4_local_error, 88 }; 89 90 void __init xfrm4_state_init(void) 91 { 92 xfrm_state_register_afinfo(&xfrm4_state_afinfo); 93 } 94