Commit a1b05140 authored by Masahide NAKAMURA's avatar Masahide NAKAMURA Committed by David S. Miller
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[XFRM] IPv6: Fix dst/routing check at transformation.



IPv6 specific thing is wrongly removed from transformation at net-2.6.25.
This patch recovers it with current design.

o Update "path" of xfrm_dst since IPv6 transformation should
  care about routing changes. It is required by MIPv6 and
  off-link destined IPsec.
o Rename nfheader_len which is for non-fragment transformation used by
  MIPv6 to rt6i_nfheader_len as IPv6 name space.
Signed-off-by: default avatarMasahide NAKAMURA <nakam@linux-ipv6.org>
Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bd515c3e
......@@ -101,7 +101,7 @@ struct rt6_info
atomic_t rt6i_ref;
/* more non-fragment space at head required */
unsigned short nfheader_len;
unsigned short rt6i_nfheader_len;
u8 rt6i_protocol;
......
......@@ -242,6 +242,9 @@ struct xfrm_policy_afinfo {
struct flowi *fl,
int reverse);
int (*get_tos)(struct flowi *fl);
int (*init_path)(struct xfrm_dst *path,
struct dst_entry *dst,
int nfheader_len);
int (*fill_dst)(struct xfrm_dst *xdst,
struct net_device *dev);
};
......
......@@ -84,6 +84,12 @@ static int xfrm4_get_tos(struct flowi *fl)
return fl->fl4_tos;
}
static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
int nfheader_len)
{
return 0;
}
static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
{
struct rtable *rt = (struct rtable *)xdst->route;
......@@ -251,6 +257,7 @@ static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
.find_bundle = __xfrm4_find_bundle,
.decode_session = _decode_session4,
.get_tos = xfrm4_get_tos,
.init_path = xfrm4_init_path,
.fill_dst = xfrm4_fill_dst,
};
......
......@@ -1126,7 +1126,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
sk->sk_sndmsg_page = NULL;
sk->sk_sndmsg_off = 0;
exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0) -
rt->nfheader_len;
rt->rt6i_nfheader_len;
length += exthdrlen;
transhdrlen += exthdrlen;
} else {
......@@ -1141,7 +1141,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
fragheaderlen = sizeof(struct ipv6hdr) + rt->nfheader_len +
fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
(opt ? opt->opt_nflen : 0);
maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr);
......
......@@ -98,6 +98,20 @@ static int xfrm6_get_tos(struct flowi *fl)
return 0;
}
static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
int nfheader_len)
{
if (dst->ops->family == AF_INET6) {
struct rt6_info *rt = (struct rt6_info*)dst;
if (rt->rt6i_node)
path->path_cookie = rt->rt6i_node->fn_sernum;
}
path->u.rt6.rt6i_nfheader_len = nfheader_len;
return 0;
}
static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
{
struct rt6_info *rt = (struct rt6_info*)xdst->route;
......@@ -115,6 +129,8 @@ static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
RTF_LOCAL);
xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
xdst->u.rt6.rt6i_node = rt->rt6i_node;
if (rt->rt6i_node)
xdst->route_cookie = rt->rt6i_node->fn_sernum;
xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
xdst->u.rt6.rt6i_src = rt->rt6i_src;
......@@ -266,6 +282,7 @@ static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
.find_bundle = __xfrm6_find_bundle,
.decode_session = _decode_session6,
.get_tos = xfrm6_get_tos,
.init_path = xfrm6_init_path,
.fill_dst = xfrm6_fill_dst,
};
......
......@@ -1266,6 +1266,23 @@ static inline struct xfrm_dst *xfrm_alloc_dst(int family)
return xdst;
}
static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
int nfheader_len)
{
struct xfrm_policy_afinfo *afinfo =
xfrm_policy_get_afinfo(dst->ops->family);
int err;
if (!afinfo)
return -EINVAL;
err = afinfo->init_path(path, dst, nfheader_len);
xfrm_policy_put_afinfo(afinfo);
return err;
}
static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
{
struct xfrm_policy_afinfo *afinfo =
......@@ -1298,6 +1315,7 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
int i = 0;
int err;
int header_len = 0;
int nfheader_len = 0;
int trailer_len = 0;
int tos;
int family = policy->selector.family;
......@@ -1352,6 +1370,8 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
dst_prev = dst1;
header_len += xfrm[i]->props.header_len;
if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
nfheader_len += xfrm[i]->props.header_len;
trailer_len += xfrm[i]->props.trailer_len;
}
......@@ -1366,6 +1386,7 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
/* Copy neighbout for reachability confirmation */
dst0->neighbour = neigh_clone(dst->neighbour);
xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
xfrm_init_pmtu(dst_prev);
for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
......
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