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xfrm: Add support for per cpu xfrm state handling.

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Currently all flows for a certain SA must be processed by the same
cpu to avoid packet reordering and lock contention of the xfrm
state lock.

To get rid of this limitation, the IETF standardized per cpu SAs
in RFC 9611. This patch implements the xfrm part of it.

We add the cpu as a lookup key for xfrm states and a config option
to generate acquire messages for each cpu.

With that, we can have on each cpu a SA with identical traffic selector
so that flows can be processed in parallel on all cpus.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Tested-by: Antony Antony <antony.antony@secunet.com>
Tested-by: Tobias Brunner <tobias@strongswan.org>
This commit is contained in:
Steffen Klassert 2024-10-23 12:53:42 +02:00
parent ab101c553b
commit 1ddf9916ac
6 changed files with 112 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/xfrm.h
View File

@ -188,6 +188,7 @@ struct xfrm_state {
refcount_t refcnt;
spinlock_t lock;
u32 pcpu_num;
struct xfrm_id id;
struct xfrm_selector sel;
struct xfrm_mark mark;
@ -1684,7 +1685,7 @@ struct xfrmk_spdinfo {
u32 spdhmcnt;
};
struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num);
int xfrm_state_delete(struct xfrm_state *x);
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
@ -1796,7 +1797,7 @@ int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
struct netlink_ext_ack *extack);
struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
u8 mode, u32 reqid, u32 if_id, u8 proto,
u8 mode, u32 reqid, u32 if_id, u32 pcpu_num, u8 proto,
const xfrm_address_t *daddr,
const xfrm_address_t *saddr, int create,
unsigned short family);

2
include/uapi/linux/xfrm.h
View File

@ -322,6 +322,7 @@ enum xfrm_attr_type_t {
XFRMA_MTIMER_THRESH, /* __u32 in seconds for input SA */
XFRMA_SA_DIR, /* __u8 */
XFRMA_NAT_KEEPALIVE_INTERVAL, /* __u32 in seconds for NAT keepalive */
XFRMA_SA_PCPU, /* __u32 */
__XFRMA_MAX
#define XFRMA_OUTPUT_MARK XFRMA_SET_MARK /* Compatibility */
@ -437,6 +438,7 @@ struct xfrm_userpolicy_info {
#define XFRM_POLICY_LOCALOK 1 /* Allow user to override global policy */
/* Automatically expand selector to include matching ICMP payloads. */
#define XFRM_POLICY_ICMP 2
#define XFRM_POLICY_CPU_ACQUIRE 4
__u8 share;
};

7
net/key/af_key.c
View File

@ -1354,7 +1354,7 @@ static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_
}
if (hdr->sadb_msg_seq) {
x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX);
if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
xfrm_state_put(x);
x = NULL;
@ -1362,7 +1362,8 @@ static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_
}
if (!x)
x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, UINT_MAX,
proto, xdaddr, xsaddr, 1, family);
if (x == NULL)
return -ENOENT;
@ -1417,7 +1418,7 @@ static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb
if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
return 0;
x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX);
if (x == NULL)
return 0;

6
net/xfrm/xfrm_compat.c
View File

@ -132,6 +132,7 @@ static const struct nla_policy compat_policy[XFRMA_MAX+1] = {
[XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
[XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
[XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
[XFRMA_SA_PCPU] = { .type = NLA_U32 },
};
static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb,
@ -282,9 +283,10 @@ static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src)
case XFRMA_MTIMER_THRESH:
case XFRMA_SA_DIR:
case XFRMA_NAT_KEEPALIVE_INTERVAL:
case XFRMA_SA_PCPU:
return xfrm_nla_cpy(dst, src, nla_len(src));
default:
BUILD_BUG_ON(XFRMA_MAX != XFRMA_NAT_KEEPALIVE_INTERVAL);
BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_PCPU);
pr_warn_once("unsupported nla_type %d\n", src->nla_type);
return -EOPNOTSUPP;
}
@ -439,7 +441,7 @@ static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla,
int err;
if (type > XFRMA_MAX) {
BUILD_BUG_ON(XFRMA_MAX != XFRMA_NAT_KEEPALIVE_INTERVAL);
BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_PCPU);
NL_SET_ERR_MSG(extack, "Bad attribute");
return -EOPNOTSUPP;
}

58
net/xfrm/xfrm_state.c
View File

@ -679,6 +679,7 @@ struct xfrm_state *xfrm_state_alloc(struct net *net)
x->lft.hard_packet_limit = XFRM_INF;
x->replay_maxage = 0;
x->replay_maxdiff = 0;
x->pcpu_num = UINT_MAX;
spin_lock_init(&x->lock);
}
return x;
@ -1155,6 +1156,12 @@ static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
struct xfrm_state **best, int *acq_in_progress,
int *error)
{
/* We need the cpu id just as a lookup key,
* we don't require it to be stable.
*/
unsigned int pcpu_id = get_cpu();
put_cpu();
/* Resolution logic:
* 1. There is a valid state with matching selector. Done.
* 2. Valid state with inappropriate selector. Skip.
@ -1174,13 +1181,18 @@ static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
&fl->u.__fl_common))
return;
if (x->pcpu_num != UINT_MAX && x->pcpu_num != pcpu_id)
return;
if (!*best ||
((*best)->pcpu_num == UINT_MAX && x->pcpu_num == pcpu_id) ||
(*best)->km.dying > x->km.dying ||
((*best)->km.dying == x->km.dying &&
(*best)->curlft.add_time < x->curlft.add_time))
*best = x;
} else if (x->km.state == XFRM_STATE_ACQ) {
*acq_in_progress = 1;
if (!*best || x->pcpu_num == pcpu_id)
*acq_in_progress = 1;
} else if (x->km.state == XFRM_STATE_ERROR ||
x->km.state == XFRM_STATE_EXPIRED) {
if ((!x->sel.family ||
@ -1209,6 +1221,13 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
unsigned short encap_family = tmpl->encap_family;
unsigned int sequence;
struct km_event c;
unsigned int pcpu_id;
/* We need the cpu id just as a lookup key,
* we don't require it to be stable.
*/
pcpu_id = get_cpu();
put_cpu();
to_put = NULL;
@ -1282,7 +1301,10 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
}
found:
x = best;
if (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) ||
(best && (best->pcpu_num == pcpu_id)))
x = best;
if (!x && !error && !acquire_in_progress) {
if (tmpl->id.spi &&
(x0 = __xfrm_state_lookup_all(net, mark, daddr,
@ -1314,6 +1336,8 @@ found:
xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
memcpy(&x->mark, &pol->mark, sizeof(x->mark));
x->if_id = if_id;
if ((pol->flags & XFRM_POLICY_CPU_ACQUIRE) && best)
x->pcpu_num = pcpu_id;
error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
if (error) {
@ -1392,6 +1416,11 @@ found:
x = NULL;
error = -ESRCH;
}
/* Use the already installed 'fallback' while the CPU-specific
* SA acquire is handled*/
if (best)
x = best;
}
out:
if (x) {
@ -1524,12 +1553,14 @@ static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
unsigned int h;
u32 mark = xnew->mark.v & xnew->mark.m;
u32 if_id = xnew->if_id;
u32 cpu_id = xnew->pcpu_num;
h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
if (x->props.family == family &&
x->props.reqid == reqid &&
x->if_id == if_id &&
x->pcpu_num == cpu_id &&
(mark & x->mark.m) == x->mark.v &&
xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
@ -1552,7 +1583,7 @@ EXPORT_SYMBOL(xfrm_state_insert);
static struct xfrm_state *__find_acq_core(struct net *net,
const struct xfrm_mark *m,
unsigned short family, u8 mode,
u32 reqid, u32 if_id, u8 proto,
u32 reqid, u32 if_id, u32 pcpu_num, u8 proto,
const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
int create)
@ -1569,6 +1600,7 @@ static struct xfrm_state *__find_acq_core(struct net *net,
x->id.spi != 0 ||
x->id.proto != proto ||
(mark & x->mark.m) != x->mark.v ||
x->pcpu_num != pcpu_num ||
!xfrm_addr_equal(&x->id.daddr, daddr, family) ||
!xfrm_addr_equal(&x->props.saddr, saddr, family))
continue;
@ -1602,6 +1634,7 @@ static struct xfrm_state *__find_acq_core(struct net *net,
break;
}
x->pcpu_num = pcpu_num;
x->km.state = XFRM_STATE_ACQ;
x->id.proto = proto;
x->props.family = family;
@ -1630,7 +1663,7 @@ static struct xfrm_state *__find_acq_core(struct net *net,
return x;
}
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num);
int xfrm_state_add(struct xfrm_state *x)
{
@ -1656,7 +1689,7 @@ int xfrm_state_add(struct xfrm_state *x)
}
if (use_spi && x->km.seq) {
x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq, x->pcpu_num);
if (x1 && ((x1->id.proto != x->id.proto) ||
!xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
to_put = x1;
@ -1666,7 +1699,7 @@ int xfrm_state_add(struct xfrm_state *x)
if (use_spi && !x1)
x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
x->props.reqid, x->if_id, x->id.proto,
x->props.reqid, x->if_id, x->pcpu_num, x->id.proto,
&x->id.daddr, &x->props.saddr, 0);
__xfrm_state_bump_genids(x);
@ -1791,6 +1824,7 @@ static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
x->props.flags = orig->props.flags;
x->props.extra_flags = orig->props.extra_flags;
x->pcpu_num = orig->pcpu_num;
x->if_id = orig->if_id;
x->tfcpad = orig->tfcpad;
x->replay_maxdiff = orig->replay_maxdiff;
@ -2066,13 +2100,14 @@ EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
struct xfrm_state *
xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
u32 if_id, u8 proto, const xfrm_address_t *daddr,
u32 if_id, u32 pcpu_num, u8 proto, const xfrm_address_t *daddr,
const xfrm_address_t *saddr, int create, unsigned short family)
{
struct xfrm_state *x;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
x = __find_acq_core(net, mark, family, mode, reqid, if_id, pcpu_num,
proto, daddr, saddr, create);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
@ -2207,7 +2242,7 @@ xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
/* Silly enough, but I'm lazy to build resolution list */
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num)
{
unsigned int h = xfrm_seq_hash(net, seq);
struct xfrm_state *x;
@ -2215,6 +2250,7 @@ static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 s
hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
if (x->km.seq == seq &&
(mark & x->mark.m) == x->mark.v &&
x->pcpu_num == pcpu_num &&
x->km.state == XFRM_STATE_ACQ) {
xfrm_state_hold(x);
return x;
@ -2224,12 +2260,12 @@ static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 s
return NULL;
}
struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num)
{
struct xfrm_state *x;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x = __xfrm_find_acq_byseq(net, mark, seq);
x = __xfrm_find_acq_byseq(net, mark, seq, pcpu_num);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}

56
net/xfrm/xfrm_user.c
View File

@ -460,6 +460,12 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
}
}
if (!sa_dir && attrs[XFRMA_SA_PCPU]) {
NL_SET_ERR_MSG(extack, "SA_PCPU only supported with SA_DIR");
err = -EINVAL;
goto out;
}
out:
return err;
}
@ -841,6 +847,12 @@ static struct xfrm_state *xfrm_state_construct(struct net *net,
x->nat_keepalive_interval =
nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]);
if (attrs[XFRMA_SA_PCPU]) {
x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
if (x->pcpu_num >= num_possible_cpus())
goto error;
}
err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack);
if (err)
goto error;
@ -1296,6 +1308,11 @@ static int copy_to_user_state_extra(struct xfrm_state *x,
if (ret)
goto out;
}
if (x->pcpu_num != UINT_MAX) {
ret = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
if (ret)
goto out;
}
if (x->dir)
ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
@ -1700,6 +1717,7 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
u32 mark;
struct xfrm_mark m;
u32 if_id = 0;
u32 pcpu_num = UINT_MAX;
p = nlmsg_data(nlh);
err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
@ -1716,8 +1734,16 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
if (attrs[XFRMA_IF_ID])
if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
if (attrs[XFRMA_SA_PCPU]) {
pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
if (pcpu_num >= num_possible_cpus()) {
err = -EINVAL;
goto out_noput;
}
}
if (p->info.seq) {
x = xfrm_find_acq_byseq(net, mark, p->info.seq);
x = xfrm_find_acq_byseq(net, mark, p->info.seq, pcpu_num);
if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
xfrm_state_put(x);
x = NULL;
@ -1726,7 +1752,7 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
if (!x)
x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
if_id, p->info.id.proto, daddr,
if_id, pcpu_num, p->info.id.proto, daddr,
&p->info.saddr, 1,
family);
err = -ENOENT;
@ -2526,7 +2552,8 @@ static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
+ nla_total_size(sizeof(struct xfrm_mark))
+ nla_total_size(4) /* XFRM_AE_RTHR */
+ nla_total_size(4) /* XFRM_AE_ETHR */
+ nla_total_size(sizeof(x->dir)); /* XFRMA_SA_DIR */
+ nla_total_size(sizeof(x->dir)) /* XFRMA_SA_DIR */
+ nla_total_size(4); /* XFRMA_SA_PCPU */
}
static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
@ -2582,6 +2609,8 @@ static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct
err = xfrm_if_id_put(skb, x->if_id);
if (err)
goto out_cancel;
if (x->pcpu_num != UINT_MAX)
err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
if (x->dir) {
err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
@ -2852,6 +2881,13 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
xfrm_mark_get(attrs, &mark);
if (attrs[XFRMA_SA_PCPU]) {
x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
err = -EINVAL;
if (x->pcpu_num >= num_possible_cpus())
goto free_state;
}
err = verify_newpolicy_info(&ua->policy, extack);
if (err)
goto free_state;
@ -3182,6 +3218,7 @@ const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
[XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
[XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
[XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
[XFRMA_SA_PCPU] = { .type = NLA_U32 },
};
EXPORT_SYMBOL_GPL(xfrma_policy);
@ -3348,7 +3385,8 @@ static inline unsigned int xfrm_expire_msgsize(void)
{
return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) +
nla_total_size(sizeof(struct xfrm_mark)) +
nla_total_size(sizeof_field(struct xfrm_state, dir));
nla_total_size(sizeof_field(struct xfrm_state, dir)) +
nla_total_size(4); /* XFRMA_SA_PCPU */
}
static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
@ -3374,6 +3412,11 @@ static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct
err = xfrm_if_id_put(skb, x->if_id);
if (err)
return err;
if (x->pcpu_num != UINT_MAX) {
err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
if (err)
return err;
}
if (x->dir) {
err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
@ -3481,6 +3524,8 @@ static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
}
if (x->if_id)
l += nla_total_size(sizeof(x->if_id));
if (x->pcpu_num)
l += nla_total_size(sizeof(x->pcpu_num));
/* Must count x->lastused as it may become non-zero behind our back. */
l += nla_total_size_64bit(sizeof(u64));
@ -3587,6 +3632,7 @@ static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
+ nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
+ nla_total_size(sizeof(struct xfrm_mark))
+ nla_total_size(xfrm_user_sec_ctx_size(x->security))
+ nla_total_size(4) /* XFRMA_SA_PCPU */
+ userpolicy_type_attrsize();
}
@ -3623,6 +3669,8 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
err = xfrm_if_id_put(skb, xp->if_id);
if (!err && xp->xdo.dev)
err = copy_user_offload(&xp->xdo, skb);
if (!err && x->pcpu_num != UINT_MAX)
err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
if (err) {
nlmsg_cancel(skb, nlh);
return err;