Date: Tue, 4 May 2021 21:43:09 GMT From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: d0666c87184f - stable/13 - Add rib_walk_from() wrapper for selective rib tree traversal. Message-ID: <202105042143.144Lh9ZZ072660@gitrepo.freebsd.org>
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The branch stable/13 has been updated by melifaro: URL: https://cgit.FreeBSD.org/src/commit/?id=d0666c87184f977442fec32a820cac63b5334bbd commit d0666c87184f977442fec32a820cac63b5334bbd Author: Alexander V. Chernikov <melifaro@FreeBSD.org> AuthorDate: 2021-04-25 11:59:40 +0000 Commit: Alexander V. Chernikov <melifaro@FreeBSD.org> CommitDate: 2021-05-04 21:30:35 +0000 Add rib_walk_from() wrapper for selective rib tree traversal. Provide wrapper for the rnh_walktree_from() rib callback. As currently `struct rib_head` is considered internal to the routing subsystem, this wrapper is necessary to maintain isolation from the external code. Differential Revision: https://reviews.freebsd.org/D29971 MFC after: 1 week (cherry picked from commit f9668e42b44f22c9ab213eb9a4792d5acfcf6903) --- sys/net/route/route_ctl.h | 6 ++++++ sys/net/route/route_helpers.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/sys/net/route/route_ctl.h b/sys/net/route/route_ctl.h index 46dba759f8df..4fe45cc8a970 100644 --- a/sys/net/route/route_ctl.h +++ b/sys/net/route/route_ctl.h @@ -62,6 +62,10 @@ int rib_add_redirect(u_int fibnum, struct sockaddr *dst, struct sockaddr *gateway, struct sockaddr *author, struct ifnet *ifp, int flags, int expire_sec); +/* common flags for the functions below */ +#define RIB_FLAG_WLOCK 0x01 /* Need exclusive rnh lock */ +#define RIB_FLAG_LOCKED 0x02 /* Do not explicitly acquire rnh lock */ + enum rib_walk_hook { RIB_WALK_HOOK_PRE, /* Hook is called before iteration */ RIB_WALK_HOOK_POST, /* Hook is called after iteration */ @@ -77,6 +81,8 @@ void rib_walk_ext_internal(struct rib_head *rnh, bool wlock, rib_walktree_f_t *wa_f, rib_walk_hook_f_t *hook_f, void *arg); void rib_walk_ext_locked(struct rib_head *rnh, rib_walktree_f_t *wa_f, rib_walk_hook_f_t *hook_f, void *arg); +void rib_walk_from(uint32_t fibnum, int family, uint32_t flags, struct sockaddr *prefix, + struct sockaddr *mask, rib_walktree_f_t *wa_f, void *arg); void rib_walk_del(u_int fibnum, int family, rib_filter_f_t *filter_f, void *arg, bool report); diff --git a/sys/net/route/route_helpers.c b/sys/net/route/route_helpers.c index 782e160ca51b..5d29197cc4fb 100644 --- a/sys/net/route/route_helpers.c +++ b/sys/net/route/route_helpers.c @@ -128,6 +128,38 @@ rib_walk(uint32_t fibnum, int family, bool wlock, rib_walktree_f_t *wa_f, rib_walk_ext(fibnum, family, wlock, wa_f, NULL, arg); } +/* + * Calls @wa_f with @arg for each entry in the table matching @prefix/@mask. + * + * The following flags are supported: + * RIB_FLAG_WLOCK: acquire exclusive lock + * RIB_FLAG_LOCKED: Assumes the table is already locked & skip locking + * + * By default, table is traversed under read lock. + */ +void +rib_walk_from(uint32_t fibnum, int family, uint32_t flags, struct sockaddr *prefix, + struct sockaddr *mask, rib_walktree_f_t *wa_f, void *arg) +{ + RIB_RLOCK_TRACKER; + struct rib_head *rnh = rt_tables_get_rnh(fibnum, family); + + if (rnh == NULL) + return; + + if (flags & RIB_FLAG_WLOCK) + RIB_WLOCK(rnh); + else if (!(flags & RIB_FLAG_LOCKED)) + RIB_RLOCK(rnh); + + rnh->rnh_walktree_from(&rnh->head, prefix, mask, (walktree_f_t *)wa_f, arg); + + if (flags & RIB_FLAG_WLOCK) + RIB_WUNLOCK(rnh); + else if (!(flags & RIB_FLAG_LOCKED)) + RIB_RUNLOCK(rnh); +} + /* * Iterates over all existing fibs in system calling * @hook_f function before/after traversing each fib.
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