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 <net/dsfield.h> 19 #include <net/ipv6.h> 20 #include <net/addrconf.h> 21 22 static void 23 __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl, 24 struct xfrm_tmpl *tmpl, 25 xfrm_address_t *daddr, xfrm_address_t *saddr) 26 { 27 /* Initialize temporary selector matching only 28 * to current session. */ 29 ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst); 30 ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src); 31 x->sel.dport = xfrm_flowi_dport(fl); 32 x->sel.dport_mask = htons(0xffff); 33 x->sel.sport = xfrm_flowi_sport(fl); 34 x->sel.sport_mask = htons(0xffff); 35 x->sel.family = AF_INET6; 36 x->sel.prefixlen_d = 128; 37 x->sel.prefixlen_s = 128; 38 x->sel.proto = fl->proto; 39 x->sel.ifindex = fl->oif; 40 x->id = tmpl->id; 41 if (ipv6_addr_any((struct in6_addr*)&x->id.daddr)) 42 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); 43 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); 44 if (ipv6_addr_any((struct in6_addr*)&x->props.saddr)) 45 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); 46 x->props.mode = tmpl->mode; 47 x->props.reqid = tmpl->reqid; 48 x->props.family = AF_INET6; 49 } 50 51 /* distribution counting sort function for xfrm_state and xfrm_tmpl */ 52 static int 53 __xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass) 54 { 55 int i; 56 int class[XFRM_MAX_DEPTH]; 57 int count[maxclass]; 58 59 memset(count, 0, sizeof(count)); 60 61 for (i = 0; i < n; i++) { 62 int c; 63 class[i] = c = cmp(src[i]); 64 count[c]++; 65 } 66 67 for (i = 2; i < maxclass; i++) 68 count[i] += count[i - 1]; 69 70 for (i = 0; i < n; i++) { 71 dst[count[class[i] - 1]++] = src[i]; 72 src[i] = NULL; 73 } 74 75 return 0; 76 } 77 78 /* 79 * Rule for xfrm_state: 80 * 81 * rule 1: select IPsec transport except AH 82 * rule 2: select MIPv6 RO or inbound trigger 83 * rule 3: select IPsec transport AH 84 * rule 4: select IPsec tunnel 85 * rule 5: others 86 */ 87 static int __xfrm6_state_sort_cmp(void *p) 88 { 89 struct xfrm_state *v = p; 90 91 switch (v->props.mode) { 92 case XFRM_MODE_TRANSPORT: 93 if (v->id.proto != IPPROTO_AH) 94 return 1; 95 else 96 return 3; 97 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 98 case XFRM_MODE_ROUTEOPTIMIZATION: 99 case XFRM_MODE_IN_TRIGGER: 100 return 2; 101 #endif 102 case XFRM_MODE_TUNNEL: 103 case XFRM_MODE_BEET: 104 return 4; 105 } 106 return 5; 107 } 108 109 static int 110 __xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n) 111 { 112 return __xfrm6_sort((void **)dst, (void **)src, n, 113 __xfrm6_state_sort_cmp, 6); 114 } 115 116 /* 117 * Rule for xfrm_tmpl: 118 * 119 * rule 1: select IPsec transport 120 * rule 2: select MIPv6 RO or inbound trigger 121 * rule 3: select IPsec tunnel 122 * rule 4: others 123 */ 124 static int __xfrm6_tmpl_sort_cmp(void *p) 125 { 126 struct xfrm_tmpl *v = p; 127 switch (v->mode) { 128 case XFRM_MODE_TRANSPORT: 129 return 1; 130 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 131 case XFRM_MODE_ROUTEOPTIMIZATION: 132 case XFRM_MODE_IN_TRIGGER: 133 return 2; 134 #endif 135 case XFRM_MODE_TUNNEL: 136 case XFRM_MODE_BEET: 137 return 3; 138 } 139 return 4; 140 } 141 142 static int 143 __xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n) 144 { 145 return __xfrm6_sort((void **)dst, (void **)src, n, 146 __xfrm6_tmpl_sort_cmp, 5); 147 } 148 149 int xfrm6_extract_header(struct sk_buff *skb) 150 { 151 struct ipv6hdr *iph = ipv6_hdr(skb); 152 153 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); 154 XFRM_MODE_SKB_CB(skb)->id = 0; 155 XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF); 156 XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph); 157 XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit; 158 XFRM_MODE_SKB_CB(skb)->optlen = 0; 159 memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl, 160 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); 161 162 return 0; 163 } 164 165 static struct xfrm_state_afinfo xfrm6_state_afinfo = { 166 .family = AF_INET6, 167 .proto = IPPROTO_IPV6, 168 .eth_proto = htons(ETH_P_IPV6), 169 .owner = THIS_MODULE, 170 .init_tempsel = __xfrm6_init_tempsel, 171 .tmpl_sort = __xfrm6_tmpl_sort, 172 .state_sort = __xfrm6_state_sort, 173 .output = xfrm6_output, 174 .extract_input = xfrm6_extract_input, 175 .extract_output = xfrm6_extract_output, 176 .transport_finish = xfrm6_transport_finish, 177 }; 178 179 int __init xfrm6_state_init(void) 180 { 181 return xfrm_state_register_afinfo(&xfrm6_state_afinfo); 182 } 183 184 void xfrm6_state_fini(void) 185 { 186 xfrm_state_unregister_afinfo(&xfrm6_state_afinfo); 187 } 188 189