Without this check, it is not possible to create two rules that are identical except for their UID ranges. For example:
root@net-test:/# ip rule add prio 1000 lookup 300 root@net-test:/# ip rule add prio 1000 uidrange 100-200 lookup 300 RTNETLINK answers: File exists root@net-test:/# ip rule add prio 1000 uidrange 100-199 lookup 100 root@net-test:/# ip rule add prio 1000 uidrange 200-299 lookup 200 root@net-test:/# ip rule add prio 1000 uidrange 300-399 lookup 100 RTNETLINK answers: File exists Tested: https://android-review.googlesource.com/#/c/299980/ Signed-off-by: Lorenzo Colitti <lore...@google.com> --- net/core/fib_rules.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c index 5de436a..b6791d9 100644 --- a/net/core/fib_rules.c +++ b/net/core/fib_rules.c @@ -343,6 +343,10 @@ static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh, if (r->l3mdev != rule->l3mdev) continue; + if (!uid_eq(r->uid_range.start, rule->uid_range.start) || + !uid_eq(r->uid_range.end, rule->uid_range.end)) + continue; + if (!ops->compare(r, frh, tb)) continue; return 1; -- 2.8.0.rc3.226.g39d4020
