1 /* 2 * xfrm6_state.c: based on xfrm4_state.c 3 * 4 * Authors: 5 * Mitsuru KANDA @USAGI 6 * Kazunori MIYAZAWA @USAGI 7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 8 * IPv6 support 9 * YOSHIFUJI Hideaki @USAGI 10 * Split up af-specific portion 11 * 12 */ 13 14 #include <net/xfrm.h> 15 #include <linux/pfkeyv2.h> 16 #include <linux/ipsec.h> 17 #include <linux/netfilter_ipv6.h> 18 #include <linux/export.h> 19 #include <net/dsfield.h> 20 #include <net/ipv6.h> 21 #include <net/addrconf.h> 22 23 static void 24 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 25 { 26 const struct flowi6 *fl6 = &fl->u.ip6; 27 28 /* Initialize temporary selector matching only 29 * to current session. */ 30 *(struct in6_addr *)&sel->daddr = fl6->daddr; 31 *(struct in6_addr *)&sel->saddr = fl6->saddr; 32 sel->dport = xfrm_flowi_dport(fl, &fl6->uli); 33 sel->dport_mask = htons(0xffff); 34 sel->sport = xfrm_flowi_sport(fl, &fl6->uli); 35 sel->sport_mask = htons(0xffff); 36 sel->family = AF_INET6; 37 sel->prefixlen_d = 128; 38 sel->prefixlen_s = 128; 39 sel->proto = fl6->flowi6_proto; 40 sel->ifindex = fl6->flowi6_oif; 41 } 42 43 static void 44 xfrm6_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 (ipv6_addr_any((struct in6_addr *)&x->id.daddr)) 49 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); 50 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); 51 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr)) 52 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); 53 x->props.mode = tmpl->mode; 54 x->props.reqid = tmpl->reqid; 55 x->props.family = AF_INET6; 56 } 57 58 /* distribution counting sort function for xfrm_state and xfrm_tmpl */ 59 static int 60 __xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass) 61 { 62 int i; 63 int class[XFRM_MAX_DEPTH]; 64 int count[maxclass]; 65 66 memset(count, 0, sizeof(count)); 67 68 for (i = 0; i < n; i++) { 69 int c; 70 class[i] = c = cmp(src[i]); 71 count[c]++; 72 } 73 74 for (i = 2; i < maxclass; i++) 75 count[i] += count[i - 1]; 76 77 for (i = 0; i < n; i++) { 78 dst[count[class[i] - 1]++] = src[i]; 79 src[i] = NULL; 80 } 81 82 return 0; 83 } 84 85 /* 86 * Rule for xfrm_state: 87 * 88 * rule 1: select IPsec transport except AH 89 * rule 2: select MIPv6 RO or inbound trigger 90 * rule 3: select IPsec transport AH 91 * rule 4: select IPsec tunnel 92 * rule 5: others 93 */ 94 static int __xfrm6_state_sort_cmp(void *p) 95 { 96 struct xfrm_state *v = p; 97 98 switch (v->props.mode) { 99 case XFRM_MODE_TRANSPORT: 100 if (v->id.proto != IPPROTO_AH) 101 return 1; 102 else 103 return 3; 104 #if IS_ENABLED(CONFIG_IPV6_MIP6) 105 case XFRM_MODE_ROUTEOPTIMIZATION: 106 case XFRM_MODE_IN_TRIGGER: 107 return 2; 108 #endif 109 case XFRM_MODE_TUNNEL: 110 case XFRM_MODE_BEET: 111 return 4; 112 } 113 return 5; 114 } 115 116 static int 117 __xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n) 118 { 119 return __xfrm6_sort((void **)dst, (void **)src, n, 120 __xfrm6_state_sort_cmp, 6); 121 } 122 123 /* 124 * Rule for xfrm_tmpl: 125 * 126 * rule 1: select IPsec transport 127 * rule 2: select MIPv6 RO or inbound trigger 128 * rule 3: select IPsec tunnel 129 * rule 4: others 130 */ 131 static int __xfrm6_tmpl_sort_cmp(void *p) 132 { 133 struct xfrm_tmpl *v = p; 134 switch (v->mode) { 135 case XFRM_MODE_TRANSPORT: 136 return 1; 137 #if IS_ENABLED(CONFIG_IPV6_MIP6) 138 case XFRM_MODE_ROUTEOPTIMIZATION: 139 case XFRM_MODE_IN_TRIGGER: 140 return 2; 141 #endif 142 case XFRM_MODE_TUNNEL: 143 case XFRM_MODE_BEET: 144 return 3; 145 } 146 return 4; 147 } 148 149 static int 150 __xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n) 151 { 152 return __xfrm6_sort((void **)dst, (void **)src, n, 153 __xfrm6_tmpl_sort_cmp, 5); 154 } 155 156 int xfrm6_extract_header(struct sk_buff *skb) 157 { 158 struct ipv6hdr *iph = ipv6_hdr(skb); 159 160 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 161 XFRM_MODE_SKB_CB(skb)->id = 0; 162 XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF); 163 XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph); 164 XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit; 165 XFRM_MODE_SKB_CB(skb)->optlen = 0; 166 memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl, 167 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 168 169 return 0; 170 } 171 172 static struct xfrm_state_afinfo xfrm6_state_afinfo = { 173 .family = AF_INET6, 174 .proto = IPPROTO_IPV6, 175 .eth_proto = htons(ETH_P_IPV6), 176 .owner = THIS_MODULE, 177 .init_tempsel = __xfrm6_init_tempsel, 178 .init_temprop = xfrm6_init_temprop, 179 .tmpl_sort = __xfrm6_tmpl_sort, 180 .state_sort = __xfrm6_state_sort, 181 .output = xfrm6_output, 182 .output_finish = xfrm6_output_finish, 183 .extract_input = xfrm6_extract_input, 184 .extract_output = xfrm6_extract_output, 185 .transport_finish = xfrm6_transport_finish, 186 .local_error = xfrm6_local_error, 187 }; 188 189 int __init xfrm6_state_init(void) 190 { 191 return xfrm_state_register_afinfo(&xfrm6_state_afinfo); 192 } 193 194 void xfrm6_state_fini(void) 195 { 196 xfrm_state_unregister_afinfo(&xfrm6_state_afinfo); 197 } 198 199