linux/net/ipv6/xfrm6_state.c
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   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
  23static 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
  43static void
  44xfrm6_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 */
  59static 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 */
  94static 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 defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 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
 116static 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 */
 131static 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 defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 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
 149static 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
 156int 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
 172static 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};
 187
 188int __init xfrm6_state_init(void)
 189{
 190        return xfrm_state_register_afinfo(&xfrm6_state_afinfo);
 191}
 192
 193void xfrm6_state_fini(void)
 194{
 195        xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
 196}
 197
 198
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