![Herbert Xu](/assets/img/avatar_default.png)
With inter-family transforms the inner mode differs from the outer mode. Attempting to handle both sides from the same function means that it needs to handle both IPv4 and IPv6 which creates duplication and confusion. This patch separates the two parts on the output path so that each function deals with one family only. In particular, the functions xfrm4_extract_output/xfrm6_extract_output moves the pertinent fields from the IPv4/IPv6 IP headers into a neutral format stored in skb->cb. This is then used by the outer mode output functions to write the outer IP header. In this way the output function no longer has to know about the inner address family. Since the extract functions are only called by tunnel modes (the only modes that can support inter-family transforms), I've also moved the xfrm*_tunnel_check_size calls into them. This allows the correct ICMP message to be sent as opposed to now where you might call icmp_send with an IPv6 packet and vice versa. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
208 lines
4.6 KiB
C
208 lines
4.6 KiB
C
/*
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* xfrm6_state.c: based on xfrm4_state.c
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*
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* Authors:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific portion
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*
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*/
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#include <net/xfrm.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <net/dsfield.h>
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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static struct xfrm_state_afinfo xfrm6_state_afinfo;
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static void
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__xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
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struct xfrm_tmpl *tmpl,
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xfrm_address_t *daddr, xfrm_address_t *saddr)
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{
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/* Initialize temporary selector matching only
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* to current session. */
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ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
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ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src);
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x->sel.dport = xfrm_flowi_dport(fl);
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x->sel.dport_mask = htons(0xffff);
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x->sel.sport = xfrm_flowi_sport(fl);
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x->sel.sport_mask = htons(0xffff);
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x->sel.prefixlen_d = 128;
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x->sel.prefixlen_s = 128;
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x->sel.proto = fl->proto;
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x->sel.ifindex = fl->oif;
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x->id = tmpl->id;
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if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
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memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
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memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
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if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
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memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
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x->props.mode = tmpl->mode;
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x->props.reqid = tmpl->reqid;
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x->props.family = AF_INET6;
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}
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static int
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__xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
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{
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int i;
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int j = 0;
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/* Rule 1: select IPsec transport except AH */
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for (i = 0; i < n; i++) {
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if (src[i]->props.mode == XFRM_MODE_TRANSPORT &&
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src[i]->id.proto != IPPROTO_AH) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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if (j == n)
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goto end;
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/* Rule 2: select MIPv6 RO or inbound trigger */
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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for (i = 0; i < n; i++) {
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if (src[i] &&
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(src[i]->props.mode == XFRM_MODE_ROUTEOPTIMIZATION ||
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src[i]->props.mode == XFRM_MODE_IN_TRIGGER)) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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if (j == n)
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goto end;
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#endif
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/* Rule 3: select IPsec transport AH */
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for (i = 0; i < n; i++) {
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if (src[i] &&
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src[i]->props.mode == XFRM_MODE_TRANSPORT &&
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src[i]->id.proto == IPPROTO_AH) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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if (j == n)
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goto end;
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/* Rule 4: select IPsec tunnel */
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for (i = 0; i < n; i++) {
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if (src[i] &&
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(src[i]->props.mode == XFRM_MODE_TUNNEL ||
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src[i]->props.mode == XFRM_MODE_BEET)) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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if (likely(j == n))
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goto end;
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/* Final rule */
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for (i = 0; i < n; i++) {
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if (src[i]) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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end:
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return 0;
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}
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static int
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__xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
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{
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int i;
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int j = 0;
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/* Rule 1: select IPsec transport */
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for (i = 0; i < n; i++) {
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if (src[i]->mode == XFRM_MODE_TRANSPORT) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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if (j == n)
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goto end;
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/* Rule 2: select MIPv6 RO or inbound trigger */
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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for (i = 0; i < n; i++) {
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if (src[i] &&
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(src[i]->mode == XFRM_MODE_ROUTEOPTIMIZATION ||
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src[i]->mode == XFRM_MODE_IN_TRIGGER)) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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if (j == n)
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goto end;
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#endif
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/* Rule 3: select IPsec tunnel */
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for (i = 0; i < n; i++) {
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if (src[i] &&
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(src[i]->mode == XFRM_MODE_TUNNEL ||
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src[i]->mode == XFRM_MODE_BEET)) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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if (likely(j == n))
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goto end;
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/* Final rule */
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for (i = 0; i < n; i++) {
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if (src[i]) {
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dst[j++] = src[i];
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src[i] = NULL;
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}
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}
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end:
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return 0;
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}
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int xfrm6_extract_header(struct sk_buff *skb)
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{
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struct ipv6hdr *iph = ipv6_hdr(skb);
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XFRM_MODE_SKB_CB(skb)->id = 0;
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XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
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XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
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XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
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XFRM_MODE_SKB_CB(skb)->protocol = iph->nexthdr;
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memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
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sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
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return 0;
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}
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static struct xfrm_state_afinfo xfrm6_state_afinfo = {
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.family = AF_INET6,
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.proto = IPPROTO_IPV6,
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.owner = THIS_MODULE,
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.init_tempsel = __xfrm6_init_tempsel,
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.tmpl_sort = __xfrm6_tmpl_sort,
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.state_sort = __xfrm6_state_sort,
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.output = xfrm6_output,
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.extract_output = xfrm6_extract_output,
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};
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void __init xfrm6_state_init(void)
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{
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xfrm_state_register_afinfo(&xfrm6_state_afinfo);
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}
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void xfrm6_state_fini(void)
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{
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xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
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}
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