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net: fib: move metrics parsing to a helper

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fib_create_info() is already quite large, so before adding more
code to the metrics section move that to a helper, similar to
ip6_convert_metrics.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2015-08-31 15:58:44 +02:00 committed by David S. Miller
parent 87583ebb9f
commit 6cf9dfd3bd
1 changed files with 41 additions and 30 deletions
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71
net/ipv4/fib_semantics.c
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@ -876,6 +876,44 @@ static bool fib_valid_prefsrc(struct fib_config *cfg, __be32 fib_prefsrc)
return true;
}
static int
fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg)
{
struct nlattr *nla;
int remaining;
if (!cfg->fc_mx)
return 0;
nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
int type = nla_type(nla);
u32 val;
if (!type)
continue;
if (type > RTAX_MAX)
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(tmp);
if (val == TCP_CA_UNSPEC)
return -EINVAL;
} else {
val = nla_get_u32(nla);
}
if (type == RTAX_ADVMSS && val > 65535 - 40)
val = 65535 - 40;
if (type == RTAX_MTU && val > 65535 - 15)
val = 65535 - 15;
fi->fib_metrics[type - 1] = val;
}
return 0;
}
struct fib_info *fib_create_info(struct fib_config *cfg)
{
int err;
@ -948,36 +986,9 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
goto failure;
} endfor_nexthops(fi)
if (cfg->fc_mx) {
struct nlattr *nla;
int remaining;
nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
int type = nla_type(nla);
if (type) {
u32 val;
if (type > RTAX_MAX)
goto err_inval;
if (type == RTAX_CC_ALGO) {
char tmp[TCP_CA_NAME_MAX];
nla_strlcpy(tmp, nla, sizeof(tmp));
val = tcp_ca_get_key_by_name(tmp);
if (val == TCP_CA_UNSPEC)
goto err_inval;
} else {
val = nla_get_u32(nla);
}
if (type == RTAX_ADVMSS && val > 65535 - 40)
val = 65535 - 40;
if (type == RTAX_MTU && val > 65535 - 15)
val = 65535 - 15;
fi->fib_metrics[type - 1] = val;
}
}
}
err = fib_convert_metrics(fi, cfg);
if (err)
goto failure;
if (cfg->fc_mp) {
#ifdef CONFIG_IP_ROUTE_MULTIPATH