From 25ee3286dcbc830a833354bb1d15567956844813 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Tue, 11 Dec 2007 09:32:34 -0800 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- include/net/xfrm.h | 11 +-- net/ipv4/xfrm4_policy.c | 134 ++++++----------------------- net/ipv6/xfrm6_policy.c | 136 +++++------------------------ net/xfrm/xfrm_policy.c | 183 ++++++++++++++++++++++++++++++++++------ 4 files changed, 211 insertions(+), 253 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index d427343f527..c9345fe3f8d 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -227,6 +227,7 @@ struct km_event u32 event; }; +struct net_device; struct xfrm_type; struct xfrm_dst; struct xfrm_policy_afinfo { @@ -237,13 +238,11 @@ struct xfrm_policy_afinfo { xfrm_address_t *daddr); int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); - int (*bundle_create)(struct xfrm_policy *policy, - struct xfrm_state **xfrm, - int nx, - struct flowi *fl, - struct dst_entry **dst_p); void (*decode_session)(struct sk_buff *skb, struct flowi *fl); + int (*get_tos)(struct flowi *fl); + int (*fill_dst)(struct xfrm_dst *xdst, + struct net_device *dev); }; extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); @@ -1094,7 +1093,6 @@ static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) } #endif -extern struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos); struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); @@ -1113,7 +1111,6 @@ extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, struct flowi *fl, int family, int strict); -extern void xfrm_init_pmtu(struct dst_entry *dst); #ifdef CONFIG_XFRM_MIGRATE extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c index cebc8473196..1d7524375b4 100644 --- a/net/ipv4/xfrm4_policy.c +++ b/net/ipv4/xfrm4_policy.c @@ -79,122 +79,39 @@ __xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy) return dst; } -/* Allocate chain of dst_entry's, attach known xfrm's, calculate - * all the metrics... Shortly, bundle a bundle. - */ - -static int -__xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, - struct flowi *fl, struct dst_entry **dst_p) +static int xfrm4_get_tos(struct flowi *fl) { - struct dst_entry *dst, *dst_prev; - struct rtable *rt0 = (struct rtable*)(*dst_p); - struct rtable *rt = rt0; - int tos = fl->fl4_tos; - int i; - int err; - int header_len = 0; - int trailer_len = 0; - - dst = dst_prev = NULL; - dst_hold(&rt->u.dst); - - for (i = 0; i < nx; i++) { - struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops); - struct xfrm_dst *xdst; - - if (unlikely(dst1 == NULL)) { - err = -ENOBUFS; - dst_release(&rt->u.dst); - goto error; - } + return fl->fl4_tos; +} - if (!dst) - dst = dst1; - else { - dst_prev->child = dst1; - dst1->flags |= DST_NOHASH; - dst_clone(dst1); - } +static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) +{ + struct rtable *rt = (struct rtable *)xdst->route; - xdst = (struct xfrm_dst *)dst1; - xdst->route = &rt->u.dst; - xdst->genid = xfrm[i]->genid; + xdst->u.rt.fl = rt->fl; - dst1->next = dst_prev; - dst_prev = dst1; + xdst->u.dst.dev = dev; + dev_hold(dev); - header_len += xfrm[i]->props.header_len; - trailer_len += xfrm[i]->props.trailer_len; + xdst->u.rt.idev = in_dev_get(dev); + if (!xdst->u.rt.idev) + return -ENODEV; - if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { - dst1 = xfrm_dst_lookup(xfrm[i], tos); - err = PTR_ERR(dst1); - if (IS_ERR(dst1)) - goto error; + xdst->u.rt.peer = rt->peer; + if (rt->peer) + atomic_inc(&rt->peer->refcnt); - rt = (struct rtable *)dst1; - } else - dst_hold(&rt->u.dst); - } + /* Sheit... I remember I did this right. Apparently, + * it was magically lost, so this code needs audit */ + xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | + RTCF_LOCAL); + xdst->u.rt.rt_type = rt->rt_type; + xdst->u.rt.rt_src = rt->rt_src; + xdst->u.rt.rt_dst = rt->rt_dst; + xdst->u.rt.rt_gateway = rt->rt_gateway; + xdst->u.rt.rt_spec_dst = rt->rt_spec_dst; - dst_prev->child = &rt->u.dst; - dst->path = &rt->u.dst; - - /* Copy neighbout for reachability confirmation */ - dst->neighbour = neigh_clone(rt->u.dst.neighbour); - - *dst_p = dst; - dst = dst_prev; - - dst_prev = *dst_p; - i = 0; - err = -ENODEV; - for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) { - struct xfrm_dst *x = (struct xfrm_dst*)dst_prev; - x->u.rt.fl = *fl; - - dst_prev->xfrm = xfrm[i++]; - dst_prev->dev = rt->u.dst.dev; - if (!rt->u.dst.dev) - goto error; - dev_hold(rt->u.dst.dev); - - x->u.rt.idev = in_dev_get(rt->u.dst.dev); - if (!x->u.rt.idev) - goto error; - - dst_prev->obsolete = -1; - dst_prev->flags |= DST_HOST; - dst_prev->lastuse = jiffies; - dst_prev->header_len = header_len; - dst_prev->trailer_len = trailer_len; - memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics)); - - dst_prev->input = dst_discard; - dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output; - if (rt0->peer) - atomic_inc(&rt0->peer->refcnt); - x->u.rt.peer = rt0->peer; - /* Sheit... I remember I did this right. Apparently, - * it was magically lost, so this code needs audit */ - x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL); - x->u.rt.rt_type = rt0->rt_type; - x->u.rt.rt_src = rt0->rt_src; - x->u.rt.rt_dst = rt0->rt_dst; - x->u.rt.rt_gateway = rt0->rt_gateway; - x->u.rt.rt_spec_dst = rt0->rt_spec_dst; - header_len -= x->u.dst.xfrm->props.header_len; - trailer_len -= x->u.dst.xfrm->props.trailer_len; - } - - xfrm_init_pmtu(dst); return 0; - -error: - if (dst) - dst_free(dst); - return err; } static void @@ -330,8 +247,9 @@ static struct xfrm_policy_afinfo xfrm4_policy_afinfo = { .dst_lookup = xfrm4_dst_lookup, .get_saddr = xfrm4_get_saddr, .find_bundle = __xfrm4_find_bundle, - .bundle_create = __xfrm4_bundle_create, .decode_session = _decode_session4, + .get_tos = xfrm4_get_tos, + .fill_dst = xfrm4_fill_dst, }; static void __init xfrm4_policy_init(void) diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c index 8e78530865a..63932c5fd3c 100644 --- a/net/ipv6/xfrm6_policy.c +++ b/net/ipv6/xfrm6_policy.c @@ -93,126 +93,33 @@ __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy) return dst; } -/* Allocate chain of dst_entry's, attach known xfrm's, calculate - * all the metrics... Shortly, bundle a bundle. - */ - -static int -__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, - struct flowi *fl, struct dst_entry **dst_p) +static int xfrm6_get_tos(struct flowi *fl) { - struct dst_entry *dst, *dst_prev; - struct rt6_info *rt0 = (struct rt6_info*)(*dst_p); - struct rt6_info *rt = rt0; - int i; - int err; - int header_len = 0; - int trailer_len = 0; - - dst = dst_prev = NULL; - dst_hold(&rt->u.dst); - - for (i = 0; i < nx; i++) { - struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops); - struct xfrm_dst *xdst; + return 0; +} - if (unlikely(dst1 == NULL)) { - err = -ENOBUFS; - dst_release(&rt->u.dst); - goto error; - } +static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) +{ + struct rt6_info *rt = (struct rt6_info*)xdst->route; - if (!dst) - dst = dst1; - else { - dst_prev->child = dst1; - dst1->flags |= DST_NOHASH; - dst_clone(dst1); - } + xdst->u.dst.dev = dev; + dev_hold(dev); - xdst = (struct xfrm_dst *)dst1; - xdst->route = &rt->u.dst; - xdst->genid = xfrm[i]->genid; - if (rt->rt6i_node) - xdst->route_cookie = rt->rt6i_node->fn_sernum; - - dst1->next = dst_prev; - dst_prev = dst1; - - if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) - ((struct rt6_info *)dst)->nfheader_len += - xfrm[i]->props.header_len; - header_len += xfrm[i]->props.header_len; - trailer_len += xfrm[i]->props.trailer_len; - - if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { - dst1 = xfrm_dst_lookup(xfrm[i], 0); - err = PTR_ERR(dst1); - if (IS_ERR(dst1)) - goto error; - - rt = (struct rt6_info *)dst1; - } else - dst_hold(&rt->u.dst); - } + xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev); + if (!xdst->u.rt6.rt6i_idev) + return -ENODEV; - dst_prev->child = &rt->u.dst; - dst->path = &rt->u.dst; - - /* Copy neighbour for reachability confirmation */ - dst->neighbour = neigh_clone(rt->u.dst.neighbour); - - if (rt->rt6i_node) - ((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum; - - *dst_p = dst; - dst = dst_prev; - - dst_prev = *dst_p; - i = 0; - err = -ENODEV; - for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) { - struct xfrm_dst *x = (struct xfrm_dst*)dst_prev; - - dst_prev->xfrm = xfrm[i++]; - dst_prev->dev = rt->u.dst.dev; - if (!rt->u.dst.dev) - goto error; - dev_hold(rt->u.dst.dev); - - x->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev); - if (!x->u.rt6.rt6i_idev) - goto error; - - dst_prev->obsolete = -1; - dst_prev->flags |= DST_HOST; - dst_prev->lastuse = jiffies; - dst_prev->header_len = header_len; - dst_prev->trailer_len = trailer_len; - memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics)); - - dst_prev->input = dst_discard; - dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output; - /* Sheit... I remember I did this right. Apparently, - * it was magically lost, so this code needs audit */ - x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTF_ANYCAST|RTF_LOCAL); - x->u.rt6.rt6i_metric = rt0->rt6i_metric; - x->u.rt6.rt6i_node = rt0->rt6i_node; - x->u.rt6.rt6i_gateway = rt0->rt6i_gateway; - memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway)); - x->u.rt6.rt6i_dst = rt0->rt6i_dst; - x->u.rt6.rt6i_src = rt0->rt6i_src; - header_len -= x->u.dst.xfrm->props.header_len; - trailer_len -= x->u.dst.xfrm->props.trailer_len; - } + /* Sheit... I remember I did this right. Apparently, + * it was magically lost, so this code needs audit */ + xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | + RTF_LOCAL); + xdst->u.rt6.rt6i_metric = rt->rt6i_metric; + xdst->u.rt6.rt6i_node = rt->rt6i_node; + xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; + xdst->u.rt6.rt6i_dst = rt->rt6i_dst; + xdst->u.rt6.rt6i_src = rt->rt6i_src; - xfrm_init_pmtu(dst); return 0; - -error: - if (dst) - dst_free(dst); - return err; } static inline void @@ -355,8 +262,9 @@ static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { .dst_lookup = xfrm6_dst_lookup, .get_saddr = xfrm6_get_saddr, .find_bundle = __xfrm6_find_bundle, - .bundle_create = __xfrm6_bundle_create, .decode_session = _decode_session6, + .get_tos = xfrm6_get_tos, + .fill_dst = xfrm6_fill_dst, }; static void __init xfrm6_policy_init(void) 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 #include #include +#include #include #include @@ -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; ilock); @@ -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. */ -- 2.20.1