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ipv6: Pass fib6_result to fib lookups
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Change fib6_lookup and fib6_table_lookup to take a fib6_result and set
f6i and nh rather than returning a fib6_info. For now both always
return 0.

A later patch set can make these more like the IPv4 counterparts and
return EINVAL, EACCESS, etc based on fib6_type.

Signed-off-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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@dsahern @davem330
dsahern authored and davem330 committed Apr 18, 2019
1 parent 8ff2e5b commit effda4d
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Showing 7 changed files with 46 additions and 53 deletions.
9 changes: 5 additions & 4 deletions include/net/ip6_fib.h
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Original file line number Diff line number Diff line change
Expand Up @@ -389,12 +389,13 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
/* called with rcu lock held; can return error pointer
* caller needs to select path
*/
struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
int flags);
int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
struct fib6_result *res, int flags);

/* called with rcu lock held; caller needs to select path */
struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
int oif, struct flowi6 *fl6, int strict);
int fib6_table_lookup(struct net *net, struct fib6_table *table,
int oif, struct flowi6 *fl6, struct fib6_result *res,
int strict);

void fib6_select_path(const struct net *net, struct fib6_result *res,
struct flowi6 *fl6, int oif, bool have_oif_match,
Expand Down
11 changes: 5 additions & 6 deletions include/net/ipv6_stubs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -29,12 +29,11 @@ struct ipv6_stub {
int (*ipv6_route_input)(struct sk_buff *skb);

struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
struct fib6_info *(*fib6_lookup)(struct net *net, int oif,
struct flowi6 *fl6, int flags);
struct fib6_info *(*fib6_table_lookup)(struct net *net,
struct fib6_table *table,
int oif, struct flowi6 *fl6,
int flags);
int (*fib6_lookup)(struct net *net, int oif, struct flowi6 *fl6,
struct fib6_result *res, int flags);
int (*fib6_table_lookup)(struct net *net, struct fib6_table *table,
int oif, struct flowi6 *fl6,
struct fib6_result *res, int flags);
void (*fib6_select_path)(const struct net *net, struct fib6_result *res,
struct flowi6 *fl6, int oif, bool oif_match,
const struct sk_buff *skb, int strict);
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10 changes: 5 additions & 5 deletions net/core/filter.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4684,7 +4684,7 @@ static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
struct inet6_dev *idev;
struct flowi6 fl6;
int strict = 0;
int oif;
int oif, err;
u32 mtu;

/* link local addresses are never forwarded */
Expand Down Expand Up @@ -4726,18 +4726,18 @@ static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
if (unlikely(!tb))
return BPF_FIB_LKUP_RET_NOT_FWDED;

res.f6i = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6,
strict);
err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res,
strict);
} else {
fl6.flowi6_mark = 0;
fl6.flowi6_secid = 0;
fl6.flowi6_tun_key.tun_id = 0;
fl6.flowi6_uid = sock_net_uid(net, NULL);

res.f6i = ipv6_stub->fib6_lookup(net, oif, &fl6, strict);
err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict);
}

if (unlikely(IS_ERR_OR_NULL(res.f6i) ||
if (unlikely(err || IS_ERR_OR_NULL(res.f6i) ||
res.f6i == net->ipv6.fib6_null_entry))
return BPF_FIB_LKUP_RET_NOT_FWDED;

Expand Down
13 changes: 7 additions & 6 deletions net/ipv6/addrconf_core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -144,18 +144,19 @@ static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id)
return NULL;
}

static struct fib6_info *
static int
eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table,
int oif, struct flowi6 *fl6, int flags)
int oif, struct flowi6 *fl6,
struct fib6_result *res, int flags)
{
return NULL;
return -EAFNOSUPPORT;
}

static struct fib6_info *
static int
eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
int flags)
struct fib6_result *res, int flags)
{
return NULL;
return -EAFNOSUPPORT;
}

static void
Expand Down
34 changes: 13 additions & 21 deletions net/ipv6/fib6_rules.c
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Original file line number Diff line number Diff line change
Expand Up @@ -61,36 +61,32 @@ unsigned int fib6_rules_seq_read(struct net *net)
}

/* called with rcu lock held; no reference taken on fib6_info */
struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
int flags)
int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
struct fib6_result *res, int flags)
{
struct fib6_info *f6i;
int err;

if (net->ipv6.fib6_has_custom_rules) {
struct fib_lookup_arg arg = {
.lookup_ptr = fib6_table_lookup,
.lookup_data = &oif,
.result = res,
.flags = FIB_LOOKUP_NOREF,
};

l3mdev_update_flow(net, flowi6_to_flowi(fl6));

err = fib_rules_lookup(net->ipv6.fib6_rules_ops,
flowi6_to_flowi(fl6), flags, &arg);
if (err)
return ERR_PTR(err);

f6i = arg.result ? : net->ipv6.fib6_null_entry;
} else {
f6i = fib6_table_lookup(net, net->ipv6.fib6_local_tbl,
oif, fl6, flags);
if (!f6i || f6i == net->ipv6.fib6_null_entry)
f6i = fib6_table_lookup(net, net->ipv6.fib6_main_tbl,
oif, fl6, flags);
err = fib6_table_lookup(net, net->ipv6.fib6_local_tbl, oif,
fl6, res, flags);
if (err || res->f6i == net->ipv6.fib6_null_entry)
err = fib6_table_lookup(net, net->ipv6.fib6_main_tbl,
oif, fl6, res, flags);
}

return f6i;
return err;
}

struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
Expand Down Expand Up @@ -157,10 +153,10 @@ static int fib6_rule_saddr(struct net *net, struct fib_rule *rule, int flags,
static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp,
int flags, struct fib_lookup_arg *arg)
{
struct fib6_result *res = arg->result;
struct flowi6 *flp6 = &flp->u.ip6;
struct net *net = rule->fr_net;
struct fib6_table *table;
struct fib6_info *f6i;
int err = -EAGAIN, *oif;
u32 tb_id;

Expand All @@ -182,14 +178,10 @@ static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp,
return -EAGAIN;

oif = (int *)arg->lookup_data;
f6i = fib6_table_lookup(net, table, *oif, flp6, flags);
if (f6i != net->ipv6.fib6_null_entry) {
err = fib6_table_lookup(net, table, *oif, flp6, res, flags);
if (!err && res->f6i != net->ipv6.fib6_null_entry)
err = fib6_rule_saddr(net, rule, flags, flp6,
fib6_info_nh_dev(f6i));

if (likely(!err))
arg->result = f6i;
}
res->nh->fib_nh_dev);

return err;
}
Expand Down
7 changes: 4 additions & 3 deletions net/ipv6/ip6_fib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -354,10 +354,11 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
}

/* called with rcu lock held; no reference taken on fib6_info */
struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
int flags)
int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
struct fib6_result *res, int flags)
{
return fib6_table_lookup(net, net->ipv6.fib6_main_tbl, oif, fl6, flags);
return fib6_table_lookup(net, net->ipv6.fib6_main_tbl, oif, fl6,
res, flags);
}

static void __net_init fib6_tables_init(struct net *net)
Expand Down
15 changes: 7 additions & 8 deletions net/ipv6/route.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1839,11 +1839,10 @@ void rt6_age_exceptions(struct fib6_info *rt,
}

/* must be called with rcu lock held */
struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
int oif, struct flowi6 *fl6, int strict)
int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
struct flowi6 *fl6, struct fib6_result *res, int strict)
{
struct fib6_node *fn, *saved_fn;
struct fib6_result res;

fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
saved_fn = fn;
Expand All @@ -1852,8 +1851,8 @@ struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
oif = 0;

redo_rt6_select:
rt6_select(net, fn, oif, &res, strict);
if (res.f6i == net->ipv6.fib6_null_entry) {
rt6_select(net, fn, oif, res, strict);
if (res->f6i == net->ipv6.fib6_null_entry) {
fn = fib6_backtrack(fn, &fl6->saddr);
if (fn)
goto redo_rt6_select;
Expand All @@ -1865,9 +1864,9 @@ struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
}
}

trace_fib6_table_lookup(net, &res, table, fl6);
trace_fib6_table_lookup(net, res, table, fl6);

return res.f6i;
return 0;
}

struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
Expand All @@ -1885,7 +1884,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,

rcu_read_lock();

res.f6i = fib6_table_lookup(net, table, oif, fl6, strict);
fib6_table_lookup(net, table, oif, fl6, &res, strict);
if (res.f6i == net->ipv6.fib6_null_entry) {
rt = net->ipv6.ip6_null_entry;
rcu_read_unlock();
Expand Down

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