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net: Add extack argument to ip_fib_metrics_init

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Add extack argument to ip_fib_metrics_init and add messages for invalid
metrics.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-11-06 12:51:15 -08:00 committed by David S. Miller
parent d0522f1cd2
commit d7e774f356
4 changed files with 25 additions and 11 deletions
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3
include/net/ip.h
View File

@ -421,7 +421,8 @@ static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
}
struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
int fc_mx_len);
int fc_mx_len,
struct netlink_ext_ack *extack);
static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
{
if (fib_metrics != &dst_default_metrics &&

2
net/ipv4/fib_semantics.c
View File

@ -1076,7 +1076,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
if (!fi)
goto failure;
fi->fib_metrics = ip_fib_metrics_init(fi->fib_net, cfg->fc_mx,
cfg->fc_mx_len);
cfg->fc_mx_len, extack);
if (unlikely(IS_ERR(fi->fib_metrics))) {
err = PTR_ERR(fi->fib_metrics);
kfree(fi);

26
net/ipv4/metrics.c
View File

@ -6,7 +6,8 @@
#include <net/tcp.h>
static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
int fc_mx_len, u32 *metrics)
int fc_mx_len, u32 *metrics,
struct netlink_ext_ack *extack)
{
bool ecn_ca = false;
struct nlattr *nla;
@ -21,19 +22,26 @@ static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
if (!type)
continue;
if (type > RTAX_MAX)
if (type > RTAX_MAX) {
NL_SET_ERR_MSG(extack, "Invalid metric type");
return -EINVAL;
}
if (type == RTAX_CC_ALGO) {
char tmp[TCP_CA_NAME_MAX];
nla_strlcpy(tmp, nla, sizeof(tmp));
val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
if (val == TCP_CA_UNSPEC)
if (val == TCP_CA_UNSPEC) {
NL_SET_ERR_MSG(extack, "Unknown tcp congestion algorithm");
return -EINVAL;
}
} else {
if (nla_len(nla) != sizeof(u32))
if (nla_len(nla) != sizeof(u32)) {
NL_SET_ERR_MSG_ATTR(extack, nla,
"Invalid attribute in metrics");
return -EINVAL;
}
val = nla_get_u32(nla);
}
if (type == RTAX_ADVMSS && val > 65535 - 40)
@ -42,8 +50,10 @@ static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
val = 65535 - 15;
if (type == RTAX_HOPLIMIT && val > 255)
val = 255;
if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) {
NL_SET_ERR_MSG(extack, "Unknown flag set in feature mask in metrics attribute");
return -EINVAL;
}
metrics[type - 1] = val;
}
@ -54,7 +64,8 @@ static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
}
struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
int fc_mx_len)
int fc_mx_len,
struct netlink_ext_ack *extack)
{
struct dst_metrics *fib_metrics;
int err;
@ -66,7 +77,8 @@ struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
if (unlikely(!fib_metrics))
return ERR_PTR(-ENOMEM);
err = ip_metrics_convert(net, fc_mx, fc_mx_len, fib_metrics->metrics);
err = ip_metrics_convert(net, fc_mx, fc_mx_len, fib_metrics->metrics,
extack);
if (!err) {
refcount_set(&fib_metrics->refcnt, 1);
} else {

5
net/ipv6/route.c
View File

@ -2975,7 +2975,8 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
if (!rt)
goto out;
rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len);
rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
extack);
if (IS_ERR(rt->fib6_metrics)) {
err = PTR_ERR(rt->fib6_metrics);
/* Do not leave garbage there. */
@ -3708,7 +3709,7 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
if (!f6i)
return ERR_PTR(-ENOMEM);
f6i->fib6_metrics = ip_fib_metrics_init(net, NULL, 0);
f6i->fib6_metrics = ip_fib_metrics_init(net, NULL, 0, NULL);
f6i->dst_nocount = true;
f6i->dst_host = true;
f6i->fib6_protocol = RTPROT_KERNEL;