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net: add extack arg to lwtunnel build state 

Pass extack arg down to lwtunnel_build_state and the build_state callbacks.
Add messages for failures in lwtunnel_build_state, and add the extarg to
nla_parse where possible in the build_state callbacks.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2017-05-27 16:19:28 -06:00 committed by David S. Miller
parent c255bd681d
commit 9ae2872748
12 changed files with 67 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/netlink.h
View File

@ -102,6 +102,16 @@ struct netlink_ext_ack {
(extack)->bad_attr = (attr); \
} while (0)
#define NL_SET_ERR_MSG_ATTR(extack, attr, msg) do { \
static const char __msg[] = (msg); \
struct netlink_ext_ack *__extack = (extack); \
\
if (__extack) { \
__extack->_msg = __msg; \
__extack->bad_attr = (attr); \
} \
} while (0)
extern void netlink_kernel_release(struct sock *sk);
extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);

9
include/net/lwtunnel.h
View File

@ -35,7 +35,8 @@ struct lwtunnel_state {
struct lwtunnel_encap_ops {
int (*build_state)(struct nlattr *encap,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts);
struct lwtunnel_state **ts,
struct netlink_ext_ack *extack);
void (*destroy_state)(struct lwtunnel_state *lws);
int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
int (*input)(struct sk_buff *skb);
@ -114,7 +115,8 @@ int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
int lwtunnel_build_state(u16 encap_type,
struct nlattr *encap,
unsigned int family, const void *cfg,
struct lwtunnel_state **lws);
struct lwtunnel_state **lws,
struct netlink_ext_ack *extack);
int lwtunnel_fill_encap(struct sk_buff *skb,
struct lwtunnel_state *lwtstate);
int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
@ -192,7 +194,8 @@ static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
static inline int lwtunnel_build_state(u16 encap_type,
struct nlattr *encap,
unsigned int family, const void *cfg,
struct lwtunnel_state **lws)
struct lwtunnel_state **lws,
struct netlink_ext_ack *extack)
{
return -EOPNOTSUPP;
}

5
net/core/lwt_bpf.c
View File

@ -240,7 +240,8 @@ static const struct nla_policy bpf_nl_policy[LWT_BPF_MAX + 1] = {
static int bpf_build_state(struct nlattr *nla,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts)
struct lwtunnel_state **ts,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[LWT_BPF_MAX + 1];
struct lwtunnel_state *newts;
@ -250,7 +251,7 @@ static int bpf_build_state(struct nlattr *nla,
if (family != AF_INET && family != AF_INET6)
return -EAFNOSUPPORT;
ret = nla_parse_nested(tb, LWT_BPF_MAX, nla, bpf_nl_policy, NULL);
ret = nla_parse_nested(tb, LWT_BPF_MAX, nla, bpf_nl_policy, extack);
if (ret < 0)
return ret;

20
net/core/lwtunnel.c
View File

@ -103,25 +103,39 @@ EXPORT_SYMBOL(lwtunnel_encap_del_ops);
int lwtunnel_build_state(u16 encap_type,
struct nlattr *encap, unsigned int family,
const void *cfg, struct lwtunnel_state **lws)
const void *cfg, struct lwtunnel_state **lws,
struct netlink_ext_ack *extack)
{
const struct lwtunnel_encap_ops *ops;
bool found = false;
int ret = -EINVAL;
if (encap_type == LWTUNNEL_ENCAP_NONE ||
encap_type > LWTUNNEL_ENCAP_MAX)
encap_type > LWTUNNEL_ENCAP_MAX) {
NL_SET_ERR_MSG_ATTR(extack, encap,
"Unknown LWT encapsulation type");
return ret;
}
ret = -EOPNOTSUPP;
rcu_read_lock();
ops = rcu_dereference(lwtun_encaps[encap_type]);
if (likely(ops && ops->build_state && try_module_get(ops->owner))) {
ret = ops->build_state(encap, family, cfg, lws);
found = true;
ret = ops->build_state(encap, family, cfg, lws, extack);
if (ret)
module_put(ops->owner);
}
rcu_read_unlock();
/* don't rely on -EOPNOTSUPP to detect match as build_state
* handlers could return it
*/
if (!found) {
NL_SET_ERR_MSG_ATTR(extack, encap,
"LWT encapsulation type not supported");
}
return ret;
}
EXPORT_SYMBOL(lwtunnel_build_state);

3
net/ipv4/fib_lookup.h
View File

@ -30,7 +30,8 @@ static inline void fib_alias_accessed(struct fib_alias *fa)
void fib_release_info(struct fib_info *);
struct fib_info *fib_create_info(struct fib_config *cfg,
struct netlink_ext_ack *extack);
int fib_nh_match(struct fib_config *cfg, struct fib_info *fi);
int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
struct netlink_ext_ack *extack);
int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event, u32 tb_id,
u8 type, __be32 dst, int dst_len, u8 tos, struct fib_info *fi,
unsigned int);

20
net/ipv4/fib_semantics.c
View File

@ -532,7 +532,7 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
ret = lwtunnel_build_state(nla_get_u16(
nla_entype),
nla, AF_INET, cfg,
&lwtstate);
&lwtstate, extack);
if (ret)
goto errout;
nexthop_nh->nh_lwtstate =
@ -614,7 +614,8 @@ static inline void fib_add_weight(struct fib_info *fi,
static int fib_encap_match(u16 encap_type,
struct nlattr *encap,
const struct fib_nh *nh,
const struct fib_config *cfg)
const struct fib_config *cfg,
struct netlink_ext_ack *extack)
{
struct lwtunnel_state *lwtstate;
int ret, result = 0;
@ -622,8 +623,8 @@ static int fib_encap_match(u16 encap_type,
if (encap_type == LWTUNNEL_ENCAP_NONE)
return 0;
ret = lwtunnel_build_state(encap_type, encap,
AF_INET, cfg, &lwtstate);
ret = lwtunnel_build_state(encap_type, encap, AF_INET,
cfg, &lwtstate, extack);
if (!ret) {
result = lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate);
lwtstate_free(lwtstate);
@ -632,7 +633,8 @@ static int fib_encap_match(u16 encap_type,
return result;
}
int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
struct netlink_ext_ack *extack)
{
#ifdef CONFIG_IP_ROUTE_MULTIPATH
struct rtnexthop *rtnh;
@ -644,9 +646,9 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
if (cfg->fc_oif || cfg->fc_gw) {
if (cfg->fc_encap) {
if (fib_encap_match(cfg->fc_encap_type,
cfg->fc_encap, fi->fib_nh, cfg))
return 1;
if (fib_encap_match(cfg->fc_encap_type, cfg->fc_encap,
fi->fib_nh, cfg, extack))
return 1;
}
if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) &&
(!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw))
@ -1148,7 +1150,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
}
err = lwtunnel_build_state(cfg->fc_encap_type,
cfg->fc_encap, AF_INET, cfg,
&lwtstate);
&lwtstate, extack);
if (err)
goto failure;

2
net/ipv4/fib_trie.c
View File

@ -1562,7 +1562,7 @@ int fib_table_delete(struct net *net, struct fib_table *tb,
fi->fib_prefsrc == cfg->fc_prefsrc) &&
(!cfg->fc_protocol ||
fi->fib_protocol == cfg->fc_protocol) &&
fib_nh_match(cfg, fi) == 0) {
fib_nh_match(cfg, fi, extack) == 0) {
fa_to_delete = fa;
break;
}

11
net/ipv4/ip_tunnel_core.c
View File

@ -228,14 +228,16 @@ static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
static int ip_tun_build_state(struct nlattr *attr,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts)
struct lwtunnel_state **ts,
struct netlink_ext_ack *extack)
{
struct ip_tunnel_info *tun_info;
struct lwtunnel_state *new_state;
struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
int err;
err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy, NULL);
err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy,
extack);
if (err < 0)
return err;
@ -325,7 +327,8 @@ static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
static int ip6_tun_build_state(struct nlattr *attr,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts)
struct lwtunnel_state **ts,
struct netlink_ext_ack *extack)
{
struct ip_tunnel_info *tun_info;
struct lwtunnel_state *new_state;
@ -333,7 +336,7 @@ static int ip6_tun_build_state(struct nlattr *attr,
int err;
err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy,
NULL);
extack);
if (err < 0)
return err;

5
net/ipv6/ila/ila_lwt.c
View File

@ -117,7 +117,8 @@ static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
static int ila_build_state(struct nlattr *nla,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts)
struct lwtunnel_state **ts,
struct netlink_ext_ack *extack)
{
struct ila_lwt *ilwt;
struct ila_params *p;
@ -146,7 +147,7 @@ static int ila_build_state(struct nlattr *nla,
return -EINVAL;
}
ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, NULL);
ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, extack);
if (ret < 0)
return ret;

2
net/ipv6/route.c
View File

@ -1939,7 +1939,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
err = lwtunnel_build_state(cfg->fc_encap_type,
cfg->fc_encap, AF_INET6, cfg,
&lwtstate);
&lwtstate, extack);
if (err)
goto out;
rt->dst.lwtstate = lwtstate_get(lwtstate);

5
net/ipv6/seg6_iptunnel.c
View File

@ -326,7 +326,8 @@ drop:
static int seg6_build_state(struct nlattr *nla,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts)
struct lwtunnel_state **ts,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[SEG6_IPTUNNEL_MAX + 1];
struct seg6_iptunnel_encap *tuninfo;
@ -336,7 +337,7 @@ static int seg6_build_state(struct nlattr *nla,
int err;
err = nla_parse_nested(tb, SEG6_IPTUNNEL_MAX, nla,
seg6_iptunnel_policy, NULL);
seg6_iptunnel_policy, extack);
if (err < 0)
return err;

5
net/mpls/mpls_iptunnel.c
View File

@ -159,7 +159,8 @@ drop:
static int mpls_build_state(struct nlattr *nla,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts)
struct lwtunnel_state **ts,
struct netlink_ext_ack *extack)
{
struct mpls_iptunnel_encap *tun_encap_info;
struct nlattr *tb[MPLS_IPTUNNEL_MAX + 1];
@ -168,7 +169,7 @@ static int mpls_build_state(struct nlattr *nla,
int ret;
ret = nla_parse_nested(tb, MPLS_IPTUNNEL_MAX, nla,
mpls_iptunnel_policy, NULL);
mpls_iptunnel_policy, extack);
if (ret < 0)
return ret;