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![Hannes Frederic Sowa](/assets/img/avatar_default.png)
In xfrm4 and xfrm6 we need to take care about sockets of the other address family. This could happen because a 6in4 or 4in6 tunnel could get protected by ipsec. Because we don't want to have a run-time dependency on ipv6 when only using ipv4 xfrm we have to embed a pointer to the correct local_error function in xfrm_state_afinet and look it up when returning an error depending on the socket address family. Thanks to vi0ss for the great bug report: <https://bugzilla.kernel.org/show_bug.cgi?id=58691> v2: a) fix two more unsafe interpretations of skb->sk as ipv6 socket (xfrm6_local_dontfrag and __xfrm6_output) v3: a) add an EXPORT_SYMBOL_GPL(xfrm_local_error) to fix a link error when building ipv6 as a module (thanks to Steffen Klassert) Reported-by: <vi0oss@gmail.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
198 lines
4.6 KiB
C
198 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 <linux/netfilter_ipv6.h>
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#include <linux/export.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 void
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__xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
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{
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const struct flowi6 *fl6 = &fl->u.ip6;
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/* Initialize temporary selector matching only
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* to current session. */
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*(struct in6_addr *)&sel->daddr = fl6->daddr;
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*(struct in6_addr *)&sel->saddr = fl6->saddr;
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sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
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sel->dport_mask = htons(0xffff);
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sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
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sel->sport_mask = htons(0xffff);
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sel->family = AF_INET6;
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sel->prefixlen_d = 128;
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sel->prefixlen_s = 128;
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sel->proto = fl6->flowi6_proto;
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sel->ifindex = fl6->flowi6_oif;
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}
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static void
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xfrm6_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
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const xfrm_address_t *daddr, const xfrm_address_t *saddr)
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{
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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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/* distribution counting sort function for xfrm_state and xfrm_tmpl */
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static int
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__xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass)
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{
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int i;
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int class[XFRM_MAX_DEPTH];
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int count[maxclass];
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memset(count, 0, sizeof(count));
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for (i = 0; i < n; i++) {
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int c;
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class[i] = c = cmp(src[i]);
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count[c]++;
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}
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for (i = 2; i < maxclass; i++)
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count[i] += count[i - 1];
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for (i = 0; i < n; i++) {
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dst[count[class[i] - 1]++] = src[i];
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src[i] = NULL;
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}
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return 0;
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}
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/*
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* Rule for xfrm_state:
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*
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* rule 1: select IPsec transport except AH
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* rule 2: select MIPv6 RO or inbound trigger
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* rule 3: select IPsec transport AH
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* rule 4: select IPsec tunnel
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* rule 5: others
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*/
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static int __xfrm6_state_sort_cmp(void *p)
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{
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struct xfrm_state *v = p;
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switch (v->props.mode) {
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case XFRM_MODE_TRANSPORT:
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if (v->id.proto != IPPROTO_AH)
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return 1;
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else
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return 3;
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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case XFRM_MODE_ROUTEOPTIMIZATION:
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case XFRM_MODE_IN_TRIGGER:
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return 2;
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#endif
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case XFRM_MODE_TUNNEL:
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case XFRM_MODE_BEET:
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return 4;
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}
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return 5;
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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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return __xfrm6_sort((void **)dst, (void **)src, n,
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__xfrm6_state_sort_cmp, 6);
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}
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/*
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* Rule for xfrm_tmpl:
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*
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* rule 1: select IPsec transport
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* rule 2: select MIPv6 RO or inbound trigger
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* rule 3: select IPsec tunnel
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* rule 4: others
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*/
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static int __xfrm6_tmpl_sort_cmp(void *p)
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{
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struct xfrm_tmpl *v = p;
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switch (v->mode) {
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case XFRM_MODE_TRANSPORT:
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return 1;
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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case XFRM_MODE_ROUTEOPTIMIZATION:
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case XFRM_MODE_IN_TRIGGER:
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return 2;
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#endif
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case XFRM_MODE_TUNNEL:
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case XFRM_MODE_BEET:
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return 3;
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}
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return 4;
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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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return __xfrm6_sort((void **)dst, (void **)src, n,
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__xfrm6_tmpl_sort_cmp, 5);
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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)->ihl = sizeof(*iph);
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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)->optlen = 0;
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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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.eth_proto = htons(ETH_P_IPV6),
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.owner = THIS_MODULE,
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.init_tempsel = __xfrm6_init_tempsel,
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.init_temprop = xfrm6_init_temprop,
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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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.output_finish = xfrm6_output_finish,
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.extract_input = xfrm6_extract_input,
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.extract_output = xfrm6_extract_output,
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.transport_finish = xfrm6_transport_finish,
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.local_error = xfrm6_local_error,
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};
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int __init xfrm6_state_init(void)
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{
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return 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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