linux/net/sched/act_tunnel_key.c
Michal Koutný 241a94abcf net/sched: Add module aliases for cls_,sch_,act_ modules
No functional change intended, aliases will be used in followup commits.
Note for backporters: you may need to add aliases also for modules that
are already removed in mainline kernel but still in your version.

Patches were generated with the help of Coccinelle scripts like:

cat >scripts/coccinelle/misc/tcf_alias.cocci <<EOD
virtual patch
virtual report

@ haskernel @
@@

@ tcf_has_kind depends on report && haskernel @
identifier ops;
constant K;
@@

  static struct tcf_proto_ops ops = {
    .kind = K,
    ...
  };
+char module_alias = K;
EOD

/usr/bin/spatch -D report --cocci-file scripts/coccinelle/misc/tcf_alias.cocci \
        --dir . \
        -I ./arch/x86/include -I ./arch/x86/include/generated -I ./include \
        -I ./arch/x86/include/uapi -I ./arch/x86/include/generated/uapi \
        -I ./include/uapi -I ./include/generated/uapi \
        --include ./include/linux/compiler-version.h --include ./include/linux/kconfig.h \
        --jobs 8 --chunksize 1 2>/dev/null | \
        sed 's/char module_alias = "\([^"]*\)";/MODULE_ALIAS_NET_CLS("\1");/'

And analogously for:

  static struct tc_action_ops ops = {
    .kind = K,

  static struct Qdisc_ops ops = {
    .id = K,

(Someone familiar would be able to fit those into one .cocci file
without sed post processing.)

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240201130943.19536-3-mkoutny@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-02 10:57:55 -08:00

882 lines
23 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2016, Amir Vadai <amir@vadai.me>
* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/geneve.h>
#include <net/vxlan.h>
#include <net/erspan.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/dst.h>
#include <net/pkt_cls.h>
#include <net/tc_wrapper.h>
#include <linux/tc_act/tc_tunnel_key.h>
#include <net/tc_act/tc_tunnel_key.h>
static struct tc_action_ops act_tunnel_key_ops;
TC_INDIRECT_SCOPE int tunnel_key_act(struct sk_buff *skb,
const struct tc_action *a,
struct tcf_result *res)
{
struct tcf_tunnel_key *t = to_tunnel_key(a);
struct tcf_tunnel_key_params *params;
int action;
params = rcu_dereference_bh(t->params);
tcf_lastuse_update(&t->tcf_tm);
tcf_action_update_bstats(&t->common, skb);
action = READ_ONCE(t->tcf_action);
switch (params->tcft_action) {
case TCA_TUNNEL_KEY_ACT_RELEASE:
skb_dst_drop(skb);
break;
case TCA_TUNNEL_KEY_ACT_SET:
skb_dst_drop(skb);
skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
break;
default:
WARN_ONCE(1, "Bad tunnel_key action %d.\n",
params->tcft_action);
break;
}
return action;
}
static const struct nla_policy
enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
[TCA_TUNNEL_KEY_ENC_OPTS_UNSPEC] = {
.strict_start_type = TCA_TUNNEL_KEY_ENC_OPTS_VXLAN },
[TCA_TUNNEL_KEY_ENC_OPTS_GENEVE] = { .type = NLA_NESTED },
[TCA_TUNNEL_KEY_ENC_OPTS_VXLAN] = { .type = NLA_NESTED },
[TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN] = { .type = NLA_NESTED },
};
static const struct nla_policy
geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] = { .type = NLA_U16 },
[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] = { .type = NLA_U8 },
[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA] = { .type = NLA_BINARY,
.len = 128 },
};
static const struct nla_policy
vxlan_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX + 1] = {
[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP] = { .type = NLA_U32 },
};
static const struct nla_policy
erspan_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX + 1] = {
[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER] = { .type = NLA_U8 },
[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX] = { .type = NLA_U32 },
[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR] = { .type = NLA_U8 },
[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID] = { .type = NLA_U8 },
};
static int
tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
int err, data_len, opt_len;
u8 *data;
err = nla_parse_nested_deprecated(tb,
TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
nla, geneve_opt_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
return -EINVAL;
}
data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
if (data_len < 4) {
NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
return -ERANGE;
}
if (data_len % 4) {
NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
return -ERANGE;
}
opt_len = sizeof(struct geneve_opt) + data_len;
if (dst) {
struct geneve_opt *opt = dst;
WARN_ON(dst_len < opt_len);
opt->opt_class =
nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
opt->length = data_len / 4; /* length is in units of 4 bytes */
opt->r1 = 0;
opt->r2 = 0;
opt->r3 = 0;
memcpy(opt + 1, data, data_len);
}
return opt_len;
}
static int
tunnel_key_copy_vxlan_opt(const struct nlattr *nla, void *dst, int dst_len,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX + 1];
int err;
err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX, nla,
vxlan_opt_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]) {
NL_SET_ERR_MSG(extack, "Missing tunnel key vxlan option gbp");
return -EINVAL;
}
if (dst) {
struct vxlan_metadata *md = dst;
md->gbp = nla_get_u32(tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]);
md->gbp &= VXLAN_GBP_MASK;
}
return sizeof(struct vxlan_metadata);
}
static int
tunnel_key_copy_erspan_opt(const struct nlattr *nla, void *dst, int dst_len,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX + 1];
int err;
u8 ver;
err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX, nla,
erspan_opt_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER]) {
NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option ver");
return -EINVAL;
}
ver = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER]);
if (ver == 1) {
if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX]) {
NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option index");
return -EINVAL;
}
} else if (ver == 2) {
if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR] ||
!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID]) {
NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option dir or hwid");
return -EINVAL;
}
} else {
NL_SET_ERR_MSG(extack, "Tunnel key erspan option ver is incorrect");
return -EINVAL;
}
if (dst) {
struct erspan_metadata *md = dst;
md->version = ver;
if (ver == 1) {
nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX];
md->u.index = nla_get_be32(nla);
} else {
nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR];
md->u.md2.dir = nla_get_u8(nla);
nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID];
set_hwid(&md->u.md2, nla_get_u8(nla));
}
}
return sizeof(struct erspan_metadata);
}
static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
int dst_len, struct netlink_ext_ack *extack)
{
int err, rem, opt_len, len = nla_len(nla), opts_len = 0, type = 0;
const struct nlattr *attr, *head = nla_data(nla);
err = nla_validate_deprecated(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
enc_opts_policy, extack);
if (err)
return err;
nla_for_each_attr(attr, head, len, rem) {
switch (nla_type(attr)) {
case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
if (type && type != TUNNEL_GENEVE_OPT) {
NL_SET_ERR_MSG(extack, "Duplicate type for geneve options");
return -EINVAL;
}
opt_len = tunnel_key_copy_geneve_opt(attr, dst,
dst_len, extack);
if (opt_len < 0)
return opt_len;
opts_len += opt_len;
if (opts_len > IP_TUNNEL_OPTS_MAX) {
NL_SET_ERR_MSG(extack, "Tunnel options exceeds max size");
return -EINVAL;
}
if (dst) {
dst_len -= opt_len;
dst += opt_len;
}
type = TUNNEL_GENEVE_OPT;
break;
case TCA_TUNNEL_KEY_ENC_OPTS_VXLAN:
if (type) {
NL_SET_ERR_MSG(extack, "Duplicate type for vxlan options");
return -EINVAL;
}
opt_len = tunnel_key_copy_vxlan_opt(attr, dst,
dst_len, extack);
if (opt_len < 0)
return opt_len;
opts_len += opt_len;
type = TUNNEL_VXLAN_OPT;
break;
case TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN:
if (type) {
NL_SET_ERR_MSG(extack, "Duplicate type for erspan options");
return -EINVAL;
}
opt_len = tunnel_key_copy_erspan_opt(attr, dst,
dst_len, extack);
if (opt_len < 0)
return opt_len;
opts_len += opt_len;
type = TUNNEL_ERSPAN_OPT;
break;
}
}
if (!opts_len) {
NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
return -EINVAL;
}
if (rem > 0) {
NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
return -EINVAL;
}
return opts_len;
}
static int tunnel_key_get_opts_len(struct nlattr *nla,
struct netlink_ext_ack *extack)
{
return tunnel_key_copy_opts(nla, NULL, 0, extack);
}
static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
int opts_len, struct netlink_ext_ack *extack)
{
info->options_len = opts_len;
switch (nla_type(nla_data(nla))) {
case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
#if IS_ENABLED(CONFIG_INET)
info->key.tun_flags |= TUNNEL_GENEVE_OPT;
return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
opts_len, extack);
#else
return -EAFNOSUPPORT;
#endif
case TCA_TUNNEL_KEY_ENC_OPTS_VXLAN:
#if IS_ENABLED(CONFIG_INET)
info->key.tun_flags |= TUNNEL_VXLAN_OPT;
return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
opts_len, extack);
#else
return -EAFNOSUPPORT;
#endif
case TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN:
#if IS_ENABLED(CONFIG_INET)
info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
opts_len, extack);
#else
return -EAFNOSUPPORT;
#endif
default:
NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
return -EINVAL;
}
}
static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
[TCA_TUNNEL_KEY_PARMS] = { .len = sizeof(struct tc_tunnel_key) },
[TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
[TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
[TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
[TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 },
[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
[TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
[TCA_TUNNEL_KEY_ENC_OPTS] = { .type = NLA_NESTED },
[TCA_TUNNEL_KEY_ENC_TOS] = { .type = NLA_U8 },
[TCA_TUNNEL_KEY_ENC_TTL] = { .type = NLA_U8 },
};
static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
{
if (!p)
return;
if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
dst_release(&p->tcft_enc_metadata->dst);
kfree_rcu(p, rcu);
}
static int tunnel_key_init(struct net *net, struct nlattr *nla,
struct nlattr *est, struct tc_action **a,
struct tcf_proto *tp, u32 act_flags,
struct netlink_ext_ack *extack)
{
struct tc_action_net *tn = net_generic(net, act_tunnel_key_ops.net_id);
bool bind = act_flags & TCA_ACT_FLAGS_BIND;
struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
struct tcf_tunnel_key_params *params_new;
struct metadata_dst *metadata = NULL;
struct tcf_chain *goto_ch = NULL;
struct tc_tunnel_key *parm;
struct tcf_tunnel_key *t;
bool exists = false;
__be16 dst_port = 0;
__be64 key_id = 0;
int opts_len = 0;
__be16 flags = 0;
u8 tos, ttl;
int ret = 0;
u32 index;
int err;
if (!nla) {
NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
return -EINVAL;
}
err = nla_parse_nested_deprecated(tb, TCA_TUNNEL_KEY_MAX, nla,
tunnel_key_policy, extack);
if (err < 0) {
NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
return err;
}
if (!tb[TCA_TUNNEL_KEY_PARMS]) {
NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
return -EINVAL;
}
parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
index = parm->index;
err = tcf_idr_check_alloc(tn, &index, a, bind);
if (err < 0)
return err;
exists = err;
if (exists && bind)
return ACT_P_BOUND;
switch (parm->t_action) {
case TCA_TUNNEL_KEY_ACT_RELEASE:
break;
case TCA_TUNNEL_KEY_ACT_SET:
if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
__be32 key32;
key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
key_id = key32_to_tunnel_id(key32);
flags = TUNNEL_KEY;
}
flags |= TUNNEL_CSUM;
if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
flags &= ~TUNNEL_CSUM;
if (nla_get_flag(tb[TCA_TUNNEL_KEY_NO_FRAG]))
flags |= TUNNEL_DONT_FRAGMENT;
if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
extack);
if (opts_len < 0) {
ret = opts_len;
goto err_out;
}
}
tos = 0;
if (tb[TCA_TUNNEL_KEY_ENC_TOS])
tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
ttl = 0;
if (tb[TCA_TUNNEL_KEY_ENC_TTL])
ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
__be32 saddr;
__be32 daddr;
saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
dst_port, flags,
key_id, opts_len);
} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
struct in6_addr saddr;
struct in6_addr daddr;
saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
0, flags,
key_id, opts_len);
} else {
NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
ret = -EINVAL;
goto err_out;
}
if (!metadata) {
NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
ret = -ENOMEM;
goto err_out;
}
#ifdef CONFIG_DST_CACHE
ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
if (ret)
goto release_tun_meta;
#endif
if (opts_len) {
ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
&metadata->u.tun_info,
opts_len, extack);
if (ret < 0)
goto release_tun_meta;
}
metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
break;
default:
NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
ret = -EINVAL;
goto err_out;
}
if (!exists) {
ret = tcf_idr_create_from_flags(tn, index, est, a,
&act_tunnel_key_ops, bind,
act_flags);
if (ret) {
NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
goto release_tun_meta;
}
ret = ACT_P_CREATED;
} else if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) {
NL_SET_ERR_MSG(extack, "TC IDR already exists");
ret = -EEXIST;
goto release_tun_meta;
}
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
if (err < 0) {
ret = err;
exists = true;
goto release_tun_meta;
}
t = to_tunnel_key(*a);
params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
if (unlikely(!params_new)) {
NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
ret = -ENOMEM;
exists = true;
goto put_chain;
}
params_new->tcft_action = parm->t_action;
params_new->tcft_enc_metadata = metadata;
spin_lock_bh(&t->tcf_lock);
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
params_new = rcu_replace_pointer(t->params, params_new,
lockdep_is_held(&t->tcf_lock));
spin_unlock_bh(&t->tcf_lock);
tunnel_key_release_params(params_new);
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
return ret;
put_chain:
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
release_tun_meta:
if (metadata)
dst_release(&metadata->dst);
err_out:
if (exists)
tcf_idr_release(*a, bind);
else
tcf_idr_cleanup(tn, index);
return ret;
}
static void tunnel_key_release(struct tc_action *a)
{
struct tcf_tunnel_key *t = to_tunnel_key(a);
struct tcf_tunnel_key_params *params;
params = rcu_dereference_protected(t->params, 1);
tunnel_key_release_params(params);
}
static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
const struct ip_tunnel_info *info)
{
int len = info->options_len;
u8 *src = (u8 *)(info + 1);
struct nlattr *start;
start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
if (!start)
return -EMSGSIZE;
while (len > 0) {
struct geneve_opt *opt = (struct geneve_opt *)src;
if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
opt->opt_class) ||
nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
opt->type) ||
nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
opt->length * 4, opt + 1)) {
nla_nest_cancel(skb, start);
return -EMSGSIZE;
}
len -= sizeof(struct geneve_opt) + opt->length * 4;
src += sizeof(struct geneve_opt) + opt->length * 4;
}
nla_nest_end(skb, start);
return 0;
}
static int tunnel_key_vxlan_opts_dump(struct sk_buff *skb,
const struct ip_tunnel_info *info)
{
struct vxlan_metadata *md = (struct vxlan_metadata *)(info + 1);
struct nlattr *start;
start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_VXLAN);
if (!start)
return -EMSGSIZE;
if (nla_put_u32(skb, TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP, md->gbp)) {
nla_nest_cancel(skb, start);
return -EMSGSIZE;
}
nla_nest_end(skb, start);
return 0;
}
static int tunnel_key_erspan_opts_dump(struct sk_buff *skb,
const struct ip_tunnel_info *info)
{
struct erspan_metadata *md = (struct erspan_metadata *)(info + 1);
struct nlattr *start;
start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN);
if (!start)
return -EMSGSIZE;
if (nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER, md->version))
goto err;
if (md->version == 1 &&
nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX, md->u.index))
goto err;
if (md->version == 2 &&
(nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR,
md->u.md2.dir) ||
nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID,
get_hwid(&md->u.md2))))
goto err;
nla_nest_end(skb, start);
return 0;
err:
nla_nest_cancel(skb, start);
return -EMSGSIZE;
}
static int tunnel_key_opts_dump(struct sk_buff *skb,
const struct ip_tunnel_info *info)
{
struct nlattr *start;
int err = -EINVAL;
if (!info->options_len)
return 0;
start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS);
if (!start)
return -EMSGSIZE;
if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
err = tunnel_key_geneve_opts_dump(skb, info);
if (err)
goto err_out;
} else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
err = tunnel_key_vxlan_opts_dump(skb, info);
if (err)
goto err_out;
} else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
err = tunnel_key_erspan_opts_dump(skb, info);
if (err)
goto err_out;
} else {
err_out:
nla_nest_cancel(skb, start);
return err;
}
nla_nest_end(skb, start);
return 0;
}
static int tunnel_key_dump_addresses(struct sk_buff *skb,
const struct ip_tunnel_info *info)
{
unsigned short family = ip_tunnel_info_af(info);
if (family == AF_INET) {
__be32 saddr = info->key.u.ipv4.src;
__be32 daddr = info->key.u.ipv4.dst;
if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
return 0;
}
if (family == AF_INET6) {
const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
if (!nla_put_in6_addr(skb,
TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
!nla_put_in6_addr(skb,
TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
return 0;
}
return -EINVAL;
}
static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
int bind, int ref)
{
unsigned char *b = skb_tail_pointer(skb);
struct tcf_tunnel_key *t = to_tunnel_key(a);
struct tcf_tunnel_key_params *params;
struct tc_tunnel_key opt = {
.index = t->tcf_index,
.refcnt = refcount_read(&t->tcf_refcnt) - ref,
.bindcnt = atomic_read(&t->tcf_bindcnt) - bind,
};
struct tcf_t tm;
spin_lock_bh(&t->tcf_lock);
params = rcu_dereference_protected(t->params,
lockdep_is_held(&t->tcf_lock));
opt.action = t->tcf_action;
opt.t_action = params->tcft_action;
if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
goto nla_put_failure;
if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
struct ip_tunnel_info *info =
&params->tcft_enc_metadata->u.tun_info;
struct ip_tunnel_key *key = &info->key;
__be32 key_id = tunnel_id_to_key32(key->tun_id);
if (((key->tun_flags & TUNNEL_KEY) &&
nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
tunnel_key_dump_addresses(skb,
&params->tcft_enc_metadata->u.tun_info) ||
(key->tp_dst &&
nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
key->tp_dst)) ||
nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
!(key->tun_flags & TUNNEL_CSUM)) ||
((key->tun_flags & TUNNEL_DONT_FRAGMENT) &&
nla_put_flag(skb, TCA_TUNNEL_KEY_NO_FRAG)) ||
tunnel_key_opts_dump(skb, info))
goto nla_put_failure;
if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
goto nla_put_failure;
if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
goto nla_put_failure;
}
tcf_tm_dump(&tm, &t->tcf_tm);
if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
&tm, TCA_TUNNEL_KEY_PAD))
goto nla_put_failure;
spin_unlock_bh(&t->tcf_lock);
return skb->len;
nla_put_failure:
spin_unlock_bh(&t->tcf_lock);
nlmsg_trim(skb, b);
return -1;
}
static void tcf_tunnel_encap_put_tunnel(void *priv)
{
struct ip_tunnel_info *tunnel = priv;
kfree(tunnel);
}
static int tcf_tunnel_encap_get_tunnel(struct flow_action_entry *entry,
const struct tc_action *act)
{
entry->tunnel = tcf_tunnel_info_copy(act);
if (!entry->tunnel)
return -ENOMEM;
entry->destructor = tcf_tunnel_encap_put_tunnel;
entry->destructor_priv = entry->tunnel;
return 0;
}
static int tcf_tunnel_key_offload_act_setup(struct tc_action *act,
void *entry_data,
u32 *index_inc,
bool bind,
struct netlink_ext_ack *extack)
{
int err;
if (bind) {
struct flow_action_entry *entry = entry_data;
if (is_tcf_tunnel_set(act)) {
entry->id = FLOW_ACTION_TUNNEL_ENCAP;
err = tcf_tunnel_encap_get_tunnel(entry, act);
if (err)
return err;
} else if (is_tcf_tunnel_release(act)) {
entry->id = FLOW_ACTION_TUNNEL_DECAP;
} else {
NL_SET_ERR_MSG_MOD(extack, "Unsupported tunnel key mode offload");
return -EOPNOTSUPP;
}
*index_inc = 1;
} else {
struct flow_offload_action *fl_action = entry_data;
if (is_tcf_tunnel_set(act))
fl_action->id = FLOW_ACTION_TUNNEL_ENCAP;
else if (is_tcf_tunnel_release(act))
fl_action->id = FLOW_ACTION_TUNNEL_DECAP;
else
return -EOPNOTSUPP;
}
return 0;
}
static struct tc_action_ops act_tunnel_key_ops = {
.kind = "tunnel_key",
.id = TCA_ID_TUNNEL_KEY,
.owner = THIS_MODULE,
.act = tunnel_key_act,
.dump = tunnel_key_dump,
.init = tunnel_key_init,
.cleanup = tunnel_key_release,
.offload_act_setup = tcf_tunnel_key_offload_act_setup,
.size = sizeof(struct tcf_tunnel_key),
};
MODULE_ALIAS_NET_ACT("tunnel_key");
static __net_init int tunnel_key_init_net(struct net *net)
{
struct tc_action_net *tn = net_generic(net, act_tunnel_key_ops.net_id);
return tc_action_net_init(net, tn, &act_tunnel_key_ops);
}
static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
{
tc_action_net_exit(net_list, act_tunnel_key_ops.net_id);
}
static struct pernet_operations tunnel_key_net_ops = {
.init = tunnel_key_init_net,
.exit_batch = tunnel_key_exit_net,
.id = &act_tunnel_key_ops.net_id,
.size = sizeof(struct tc_action_net),
};
static int __init tunnel_key_init_module(void)
{
return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
}
static void __exit tunnel_key_cleanup_module(void)
{
tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
}
module_init(tunnel_key_init_module);
module_exit(tunnel_key_cleanup_module);
MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
MODULE_DESCRIPTION("ip tunnel manipulation actions");
MODULE_LICENSE("GPL v2");