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ipv4: Encapsulate function arguments in a struct

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fib_dump_info() is used to prepare RTM_{NEW,DEL}ROUTE netlink messages
using the passed arguments. Currently, the function takes 11 arguments,
6 of which are attributes of the route being dumped (e.g., prefix, TOS).

The next patch will need the function to also dump to user space an
indication if the route is present in hardware or not. Instead of
passing yet another argument, change the function to take a struct
containing the different route attributes.

v2:
* Name last argument of fib_dump_info()
* Move 'struct fib_rt_info' to include/net/ip_fib.h so that it could
  later be passed to fib_alias_hw_flags_set()

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2020-01-14 13:23:10 +02:00 committed by David S. Miller
parent 6324d0fa03
commit 1e301fd04e
5 changed files with 45 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
include/net/ip_fib.h
View file

@ -204,6 +204,15 @@ __be32 fib_result_prefsrc(struct net *net, struct fib_result *res);
#define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev)
#define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif)
struct fib_rt_info {
struct fib_info *fi;
u32 tb_id;
__be32 dst;
int dst_len;
u8 tos;
u8 type;
};
struct fib_entry_notifier_info {
struct fib_notifier_info info; /* must be first */
u32 dst;

5
net/ipv4/fib_lookup.h
View file

@ -35,9 +35,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
struct netlink_ext_ack *extack);
bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi);
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);
int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
struct fib_rt_info *fri, unsigned int flags);
void rtmsg_fib(int event, __be32 key, struct fib_alias *fa, int dst_len,
u32 tb_id, const struct nl_info *info, unsigned int nlm_flags);

26
net/ipv4/fib_semantics.c
View file

@ -504,6 +504,7 @@ void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
int dst_len, u32 tb_id, const struct nl_info *info,
unsigned int nlm_flags)
{
struct fib_rt_info fri;
struct sk_buff *skb;
u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
int err = -ENOBUFS;
@ -512,9 +513,13 @@ void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
if (!skb)
goto errout;
err = fib_dump_info(skb, info->portid, seq, event, tb_id,
fa->fa_type, key, dst_len,
fa->fa_tos, fa->fa_info, nlm_flags);
fri.fi = fa->fa_info;
fri.tb_id = tb_id;
fri.dst = key;
fri.dst_len = dst_len;
fri.tos = fa->fa_tos;
fri.type = fa->fa_type;
err = fib_dump_info(skb, info->portid, seq, event, &fri, nlm_flags);
if (err < 0) {
/* -EMSGSIZE implies BUG in fib_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
@ -1725,10 +1730,11 @@ static int fib_add_multipath(struct sk_buff *skb, struct fib_info *fi)
#endif
int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
u32 tb_id, u8 type, __be32 dst, int dst_len, u8 tos,
struct fib_info *fi, unsigned int flags)
struct fib_rt_info *fri, unsigned int flags)
{
unsigned int nhs = fib_info_num_path(fi);
unsigned int nhs = fib_info_num_path(fri->fi);
struct fib_info *fi = fri->fi;
u32 tb_id = fri->tb_id;
struct nlmsghdr *nlh;
struct rtmsg *rtm;
@ -1738,22 +1744,22 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
rtm = nlmsg_data(nlh);
rtm->rtm_family = AF_INET;
rtm->rtm_dst_len = dst_len;
rtm->rtm_dst_len = fri->dst_len;
rtm->rtm_src_len = 0;
rtm->rtm_tos = tos;
rtm->rtm_tos = fri->tos;
if (tb_id < 256)
rtm->rtm_table = tb_id;
else
rtm->rtm_table = RT_TABLE_COMPAT;
if (nla_put_u32(skb, RTA_TABLE, tb_id))
goto nla_put_failure;
rtm->rtm_type = type;
rtm->rtm_type = fri->type;
rtm->rtm_flags = fi->fib_flags;
rtm->rtm_scope = fi->fib_scope;
rtm->rtm_protocol = fi->fib_protocol;
if (rtm->rtm_dst_len &&
nla_put_in_addr(skb, RTA_DST, dst))
nla_put_in_addr(skb, RTA_DST, fri->dst))
goto nla_put_failure;
if (fi->fib_priority &&
nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority))

14
net/ipv4/fib_trie.c
View file

@ -2194,14 +2194,18 @@ static int fn_trie_dump_leaf(struct key_vector *l, struct fib_table *tb,
if (filter->dump_routes) {
if (!s_fa) {
struct fib_rt_info fri;
fri.fi = fi;
fri.tb_id = tb->tb_id;
fri.dst = xkey;
fri.dst_len = KEYLENGTH - fa->fa_slen;
fri.tos = fa->fa_tos;
fri.type = fa->fa_type;
err = fib_dump_info(skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
RTM_NEWROUTE,
tb->tb_id, fa->fa_type,
xkey,
KEYLENGTH - fa->fa_slen,
fa->fa_tos, fi, flags);
RTM_NEWROUTE, &fri, flags);
if (err < 0)
goto stop;
}

12
net/ipv4/route.c
View file

@ -3223,16 +3223,22 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
skb_reset_mac_header(skb);
if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
struct fib_rt_info fri;
if (!res.fi) {
err = fib_props[res.type].error;
if (!err)
err = -EHOSTUNREACH;
goto errout_rcu;
}
fri.fi = res.fi;
fri.tb_id = table_id;
fri.dst = res.prefix;
fri.dst_len = res.prefixlen;
fri.tos = fl4.flowi4_tos;
fri.type = rt->rt_type;
err = fib_dump_info(skb, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWROUTE, table_id,
rt->rt_type, res.prefix, res.prefixlen,
fl4.flowi4_tos, res.fi, 0);
nlh->nlmsg_seq, RTM_NEWROUTE, &fri, 0);
} else {
err = rt_fill_info(net, dst, src, rt, table_id, &fl4, skb,
NETLINK_CB(in_skb).portid,