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ipsec-2024-10-22

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Merge tag 'ipsec-2024-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec

Steffen Klassert says:

====================
pull request (net): ipsec 2024-10-22

1) Fix routing behavior that relies on L4 information
   for xfrm encapsulated packets.
   From Eyal Birger.

2) Remove leftovers of pernet policy_inexact lists.
   From Florian Westphal.

3) Validate new SA's prefixlen when the selector family is
   not set from userspace.
   From Sabrina Dubroca.

4) Fix a kernel-infoleak when dumping an auth algorithm.
   From Petr Vaganov.

Please pull or let me know if there are problems.

ipsec-2024-10-22

* tag 'ipsec-2024-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec:
  xfrm: fix one more kernel-infoleak in algo dumping
  xfrm: validate new SA's prefixlen using SA family when sel.family is unset
  xfrm: policy: remove last remnants of pernet inexact list
  xfrm: respect ip protocols rules criteria when performing dst lookups
  xfrm: extract dst lookup parameters into a struct
====================

Link: https://patch.msgid.link/20241022092226.654370-1-steffen.klassert@secunet.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paolo Abeni 2024-10-24 11:11:32 +02:00
commit 1e424d08d3
7 changed files with 102 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/netns/xfrm.h
View File

@ -51,7 +51,6 @@ struct netns_xfrm {
struct hlist_head *policy_byidx;
unsigned int policy_idx_hmask;
unsigned int idx_generator;
struct hlist_head policy_inexact[XFRM_POLICY_MAX];
struct xfrm_policy_hash policy_bydst[XFRM_POLICY_MAX];
unsigned int policy_count[XFRM_POLICY_MAX * 2];
struct work_struct policy_hash_work;

28
include/net/xfrm.h
View File

@ -349,20 +349,25 @@ struct xfrm_if_cb {
void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
void xfrm_if_unregister_cb(void);
struct xfrm_dst_lookup_params {
struct net *net;
int tos;
int oif;
xfrm_address_t *saddr;
xfrm_address_t *daddr;
u32 mark;
__u8 ipproto;
union flowi_uli uli;
};
struct net_device;
struct xfrm_type;
struct xfrm_dst;
struct xfrm_policy_afinfo {
struct dst_ops *dst_ops;
struct dst_entry *(*dst_lookup)(struct net *net,
int tos, int oif,
const xfrm_address_t *saddr,
const xfrm_address_t *daddr,
u32 mark);
int (*get_saddr)(struct net *net, int oif,
xfrm_address_t *saddr,
xfrm_address_t *daddr,
u32 mark);
struct dst_entry *(*dst_lookup)(const struct xfrm_dst_lookup_params *params);
int (*get_saddr)(xfrm_address_t *saddr,
const struct xfrm_dst_lookup_params *params);
int (*fill_dst)(struct xfrm_dst *xdst,
struct net_device *dev,
const struct flowi *fl);
@ -1764,10 +1769,7 @@ static inline int xfrm_user_policy(struct sock *sk, int optname,
}
#endif
struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
const xfrm_address_t *saddr,
const xfrm_address_t *daddr,
int family, u32 mark);
struct dst_entry *__xfrm_dst_lookup(int family, const struct xfrm_dst_lookup_params *params);
struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);

38
net/ipv4/xfrm4_policy.c
View File

@ -17,47 +17,43 @@
#include <net/ip.h>
#include <net/l3mdev.h>
static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
int tos, int oif,
const xfrm_address_t *saddr,
const xfrm_address_t *daddr,
u32 mark)
static struct dst_entry *__xfrm4_dst_lookup(struct flowi4 *fl4,
const struct xfrm_dst_lookup_params *params)
{
struct rtable *rt;
memset(fl4, 0, sizeof(*fl4));
fl4->daddr = daddr->a4;
fl4->flowi4_tos = tos;
fl4->flowi4_l3mdev = l3mdev_master_ifindex_by_index(net, oif);
fl4->flowi4_mark = mark;
if (saddr)
fl4->saddr = saddr->a4;
fl4->daddr = params->daddr->a4;
fl4->flowi4_tos = params->tos;
fl4->flowi4_l3mdev = l3mdev_master_ifindex_by_index(params->net,
params->oif);
fl4->flowi4_mark = params->mark;
if (params->saddr)
fl4->saddr = params->saddr->a4;
fl4->flowi4_proto = params->ipproto;
fl4->uli = params->uli;
rt = __ip_route_output_key(net, fl4);
rt = __ip_route_output_key(params->net, fl4);
if (!IS_ERR(rt))
return &rt->dst;
return ERR_CAST(rt);
}
static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
const xfrm_address_t *saddr,
const xfrm_address_t *daddr,
u32 mark)
static struct dst_entry *xfrm4_dst_lookup(const struct xfrm_dst_lookup_params *params)
{
struct flowi4 fl4;
return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr, mark);
return __xfrm4_dst_lookup(&fl4, params);
}
static int xfrm4_get_saddr(struct net *net, int oif,
xfrm_address_t *saddr, xfrm_address_t *daddr,
u32 mark)
static int xfrm4_get_saddr(xfrm_address_t *saddr,
const struct xfrm_dst_lookup_params *params)
{
struct dst_entry *dst;
struct flowi4 fl4;
dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr, mark);
dst = __xfrm4_dst_lookup(&fl4, params);
if (IS_ERR(dst))
return -EHOSTUNREACH;

31
net/ipv6/xfrm6_policy.c
View File

@ -23,23 +23,24 @@
#include <net/ip6_route.h>
#include <net/l3mdev.h>
static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
const xfrm_address_t *saddr,
const xfrm_address_t *daddr,
u32 mark)
static struct dst_entry *xfrm6_dst_lookup(const struct xfrm_dst_lookup_params *params)
{
struct flowi6 fl6;
struct dst_entry *dst;
int err;
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_l3mdev = l3mdev_master_ifindex_by_index(net, oif);
fl6.flowi6_mark = mark;
memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
if (saddr)
memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
fl6.flowi6_l3mdev = l3mdev_master_ifindex_by_index(params->net,
params->oif);
fl6.flowi6_mark = params->mark;
memcpy(&fl6.daddr, params->daddr, sizeof(fl6.daddr));
if (params->saddr)
memcpy(&fl6.saddr, params->saddr, sizeof(fl6.saddr));
dst = ip6_route_output(net, NULL, &fl6);
fl6.flowi4_proto = params->ipproto;
fl6.uli = params->uli;
dst = ip6_route_output(params->net, NULL, &fl6);
err = dst->error;
if (dst->error) {
@ -50,15 +51,14 @@ static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
return dst;
}
static int xfrm6_get_saddr(struct net *net, int oif,
xfrm_address_t *saddr, xfrm_address_t *daddr,
u32 mark)
static int xfrm6_get_saddr(xfrm_address_t *saddr,
const struct xfrm_dst_lookup_params *params)
{
struct dst_entry *dst;
struct net_device *dev;
struct inet6_dev *idev;
dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark);
dst = xfrm6_dst_lookup(params);
if (IS_ERR(dst))
return -EHOSTUNREACH;
@ -68,7 +68,8 @@ static int xfrm6_get_saddr(struct net *net, int oif,
return -EHOSTUNREACH;
}
dev = idev->dev;
ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
ipv6_dev_get_saddr(dev_net(dev), dev, &params->daddr->in6, 0,
&saddr->in6);
dst_release(dst);
return 0;
}

11
net/xfrm/xfrm_device.c
View File

@ -269,6 +269,8 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
dev = dev_get_by_index(net, xuo->ifindex);
if (!dev) {
struct xfrm_dst_lookup_params params;
if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
saddr = &x->props.saddr;
daddr = &x->id.daddr;
@ -277,9 +279,12 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
daddr = &x->props.saddr;
}
dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
x->props.family,
xfrm_smark_get(0, x));
memset(&params, 0, sizeof(params));
params.net = net;
params.saddr = saddr;
params.daddr = daddr;
params.mark = xfrm_smark_get(0, x);
dst = __xfrm_dst_lookup(x->props.family, &params);
if (IS_ERR(dst))
return (is_packet_offload) ? -EINVAL : 0;

53
net/xfrm/xfrm_policy.c
View File

@ -270,10 +270,8 @@ static const struct xfrm_if_cb *xfrm_if_get_cb(void)
return rcu_dereference(xfrm_if_cb);
}
struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
const xfrm_address_t *saddr,
const xfrm_address_t *daddr,
int family, u32 mark)
struct dst_entry *__xfrm_dst_lookup(int family,
const struct xfrm_dst_lookup_params *params)
{
const struct xfrm_policy_afinfo *afinfo;
struct dst_entry *dst;
@ -282,7 +280,7 @@ struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
if (unlikely(afinfo == NULL))
return ERR_PTR(-EAFNOSUPPORT);
dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr, mark);
dst = afinfo->dst_lookup(params);
rcu_read_unlock();
@ -296,6 +294,7 @@ static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
xfrm_address_t *prev_daddr,
int family, u32 mark)
{
struct xfrm_dst_lookup_params params;
struct net *net = xs_net(x);
xfrm_address_t *saddr = &x->props.saddr;
xfrm_address_t *daddr = &x->id.daddr;
@ -310,7 +309,29 @@ static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
daddr = x->coaddr;
}
dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family, mark);
params.net = net;
params.saddr = saddr;
params.daddr = daddr;
params.tos = tos;
params.oif = oif;
params.mark = mark;
params.ipproto = x->id.proto;
if (x->encap) {
switch (x->encap->encap_type) {
case UDP_ENCAP_ESPINUDP:
params.ipproto = IPPROTO_UDP;
params.uli.ports.sport = x->encap->encap_sport;
params.uli.ports.dport = x->encap->encap_dport;
break;
case TCP_ENCAP_ESPINTCP:
params.ipproto = IPPROTO_TCP;
params.uli.ports.sport = x->encap->encap_sport;
params.uli.ports.dport = x->encap->encap_dport;
break;
}
}
dst = __xfrm_dst_lookup(family, &params);
if (!IS_ERR(dst)) {
if (prev_saddr != saddr)
@ -2432,15 +2453,15 @@ int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
}
static int
xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
xfrm_address_t *remote, unsigned short family, u32 mark)
xfrm_get_saddr(unsigned short family, xfrm_address_t *saddr,
const struct xfrm_dst_lookup_params *params)
{
int err;
const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
if (unlikely(afinfo == NULL))
return -EINVAL;
err = afinfo->get_saddr(net, oif, local, remote, mark);
err = afinfo->get_saddr(saddr, params);
rcu_read_unlock();
return err;
}
@ -2469,9 +2490,14 @@ xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
remote = &tmpl->id.daddr;
local = &tmpl->saddr;
if (xfrm_addr_any(local, tmpl->encap_family)) {
error = xfrm_get_saddr(net, fl->flowi_oif,
&tmp, remote,
tmpl->encap_family, 0);
struct xfrm_dst_lookup_params params;
memset(&params, 0, sizeof(params));
params.net = net;
params.oif = fl->flowi_oif;
params.daddr = remote;
error = xfrm_get_saddr(tmpl->encap_family, &tmp,
&params);
if (error)
goto fail;
local = &tmp;
@ -4180,7 +4206,6 @@ static int __net_init xfrm_policy_init(struct net *net)
net->xfrm.policy_count[dir] = 0;
net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
htab = &net->xfrm.policy_bydst[dir];
htab->table = xfrm_hash_alloc(sz);
@ -4234,8 +4259,6 @@ static void xfrm_policy_fini(struct net *net)
for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
struct xfrm_policy_hash *htab;
WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
htab = &net->xfrm.policy_bydst[dir];
sz = (htab->hmask + 1) * sizeof(struct hlist_head);
WARN_ON(!hlist_empty(htab->table));

10
net/xfrm/xfrm_user.c
View File

@ -201,6 +201,7 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
{
int err;
u8 sa_dir = attrs[XFRMA_SA_DIR] ? nla_get_u8(attrs[XFRMA_SA_DIR]) : 0;
u16 family = p->sel.family;
err = -EINVAL;
switch (p->family) {
@ -221,7 +222,10 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
goto out;
}
switch (p->sel.family) {
if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
family = p->family;
switch (family) {
case AF_UNSPEC:
break;
@ -1098,7 +1102,9 @@ static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
if (!nla)
return -EMSGSIZE;
ap = nla_data(nla);
memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
strscpy_pad(ap->alg_name, auth->alg_name, sizeof(ap->alg_name));
ap->alg_key_len = auth->alg_key_len;
ap->alg_trunc_len = auth->alg_trunc_len;
if (redact_secret && auth->alg_key_len)
memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
else