diff options
author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-12-11 09:32:34 -0800 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:53:43 -0800 |
commit | 25ee3286dcbc830a833354bb1d15567956844813 (patch) | |
tree | bb5597d9e148f363bf0bbcd1a7269b5f677f0103 /net/xfrm/xfrm_policy.c | |
parent | 66cdb3ca27323a92712d289fc5edc7841d74a139 (diff) |
[IPSEC]: Merge common code into xfrm_bundle_create
Half of the code in xfrm4_bundle_create and xfrm6_bundle_create are
common. This patch extracts that logic and puts it into
xfrm_bundle_create. The rest of it are then accessed through afinfo.
As a result this fixes the problem with inter-family transforms where
we treat every xfrm dst in the bundle as if it belongs to the top
family.
This patch also fixes a long-standing error-path bug where we may free
the xfrm states twice.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm/xfrm_policy.c')
-rw-r--r-- | net/xfrm/xfrm_policy.c | 183 |
1 files changed, 159 insertions, 24 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 085c19d4d1b..b153f748205 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -24,6 +24,7 @@ #include <linux/netfilter.h> #include <linux/module.h> #include <linux/cache.h> +#include <net/dst.h> #include <net/xfrm.h> #include <net/ip.h> @@ -50,6 +51,7 @@ static DEFINE_SPINLOCK(xfrm_policy_gc_lock); static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); +static void xfrm_init_pmtu(struct dst_entry *dst); static inline int __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) @@ -85,7 +87,8 @@ int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, return 0; } -struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos) +static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, + int family) { xfrm_address_t *saddr = &x->props.saddr; xfrm_address_t *daddr = &x->id.daddr; @@ -97,7 +100,7 @@ struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos) if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) daddr = x->coaddr; - afinfo = xfrm_policy_get_afinfo(x->props.family); + afinfo = xfrm_policy_get_afinfo(family); if (unlikely(afinfo == NULL)) return ERR_PTR(-EAFNOSUPPORT); @@ -105,7 +108,6 @@ struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos) xfrm_policy_put_afinfo(afinfo); return dst; } -EXPORT_SYMBOL(xfrm_dst_lookup); static inline unsigned long make_jiffies(long secs) { @@ -1234,24 +1236,164 @@ xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short fa return x; } -/* Allocate chain of dst_entry's, attach known xfrm's, calculate - * all the metrics... Shortly, bundle a bundle. - */ +static inline int xfrm_get_tos(struct flowi *fl, int family) +{ + struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + int tos; -static int -xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, - struct flowi *fl, struct dst_entry **dst_p, - unsigned short family) + if (!afinfo) + return -EINVAL; + + tos = afinfo->get_tos(fl); + + xfrm_policy_put_afinfo(afinfo); + + return tos; +} + +static inline struct xfrm_dst *xfrm_alloc_dst(int family) { - int err; struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); - if (unlikely(afinfo == NULL)) + struct xfrm_dst *xdst; + + if (!afinfo) + return ERR_PTR(-EINVAL); + + xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); + + xfrm_policy_put_afinfo(afinfo); + + return xdst; +} + +static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) +{ + struct xfrm_policy_afinfo *afinfo = + xfrm_policy_get_afinfo(xdst->u.dst.ops->family); + int err; + + if (!afinfo) return -EINVAL; - err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); + + err = afinfo->fill_dst(xdst, dev); + xfrm_policy_put_afinfo(afinfo); + return err; } +/* Allocate chain of dst_entry's, attach known xfrm's, calculate + * all the metrics... Shortly, bundle a bundle. + */ + +static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, + struct xfrm_state **xfrm, int nx, + struct flowi *fl, + struct dst_entry *dst) +{ + unsigned long now = jiffies; + struct net_device *dev; + struct dst_entry *dst_prev = NULL; + struct dst_entry *dst0 = NULL; + int i = 0; + int err; + int header_len = 0; + int trailer_len = 0; + int tos; + int family = policy->selector.family; + + tos = xfrm_get_tos(fl, family); + err = tos; + if (tos < 0) + goto put_states; + + dst_hold(dst); + + for (; i < nx; i++) { + struct xfrm_dst *xdst = xfrm_alloc_dst(family); + struct dst_entry *dst1 = &xdst->u.dst; + + err = PTR_ERR(xdst); + if (IS_ERR(xdst)) { + dst_release(dst); + goto put_states; + } + + if (!dst_prev) + dst0 = dst1; + else { + dst_prev->child = dst_clone(dst1); + dst1->flags |= DST_NOHASH; + } + + xdst->route = dst; + memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); + + if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { + family = xfrm[i]->props.family; + dst = xfrm_dst_lookup(xfrm[i], tos, family); + err = PTR_ERR(dst); + if (IS_ERR(dst)) + goto put_states; + } else + dst_hold(dst); + + dst1->xfrm = xfrm[i]; + xdst->genid = xfrm[i]->genid; + + dst1->obsolete = -1; + dst1->flags |= DST_HOST; + dst1->lastuse = now; + + dst1->input = dst_discard; + dst1->output = xfrm[i]->outer_mode->afinfo->output; + + dst1->next = dst_prev; + dst_prev = dst1; + + header_len += xfrm[i]->props.header_len; + trailer_len += xfrm[i]->props.trailer_len; + } + + dst_prev->child = dst; + dst0->path = dst; + + err = -ENODEV; + dev = dst->dev; + if (!dev) + goto free_dst; + + /* Copy neighbout for reachability confirmation */ + dst0->neighbour = neigh_clone(dst->neighbour); + + xfrm_init_pmtu(dst_prev); + + for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { + struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; + + err = xfrm_fill_dst(xdst, dev); + if (err) + goto free_dst; + + dst_prev->header_len = header_len; + dst_prev->trailer_len = trailer_len; + header_len -= xdst->u.dst.xfrm->props.header_len; + trailer_len -= xdst->u.dst.xfrm->props.trailer_len; + } + +out: + return dst0; + +put_states: + for (; i < nx; i++) + xfrm_state_put(xfrm[i]); +free_dst: + if (dst0) + dst_free(dst0); + dst0 = ERR_PTR(err); + goto out; +} + static int inline xfrm_dst_alloc_copy(void **target, void *src, int size) { @@ -1454,15 +1596,10 @@ restart: return 0; } - dst = dst_orig; - err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); - - if (unlikely(err)) { - int i; - for (i=0; i<nx; i++) - xfrm_state_put(xfrm[i]); + dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); + err = PTR_ERR(dst); + if (IS_ERR(dst)) goto error; - } for (pi = 0; pi < npols; pi++) { read_lock_bh(&pols[pi]->lock); @@ -1886,7 +2023,7 @@ static int xfrm_flush_bundles(void) return 0; } -void xfrm_init_pmtu(struct dst_entry *dst) +static void xfrm_init_pmtu(struct dst_entry *dst) { do { struct xfrm_dst *xdst = (struct xfrm_dst *)dst; @@ -1907,8 +2044,6 @@ void xfrm_init_pmtu(struct dst_entry *dst) } while ((dst = dst->next)); } -EXPORT_SYMBOL(xfrm_init_pmtu); - /* Check that the bundle accepts the flow and its components are * still valid. */ |