21ca7b57bd
previously always pointing to the default vnet context, to a dynamically changing thread-local one. The currvnet context should be set on entry to networking code via CURVNET_SET() macros, and reverted to previous state via CURVNET_RESTORE(). Recursions on curvnet are permitted, though strongly discuouraged. This change should have no functional impact on nooptions VIMAGE kernel builds, where CURVNET_* macros expand to whitespace. The curthread->td_vnet (aka curvnet) variable's purpose is to be an indicator of the vnet context in which the current network-related operation takes place, in case we cannot deduce the current vnet context from any other source, such as by looking at mbuf's m->m_pkthdr.rcvif->if_vnet, sockets's so->so_vnet etc. Moreover, so far curvnet has turned out to be an invaluable consistency checking aid: it helps to catch cases when sockets, ifnets or any other vnet-aware structures may have leaked from one vnet to another. The exact placement of the CURVNET_SET() / CURVNET_RESTORE() macros was a result of an empirical iterative process, whith an aim to reduce recursions on CURVNET_SET() to a minimum, while still reducing the scope of CURVNET_SET() to networking only operations - the alternative would be calling CURVNET_SET() on each system call entry. In general, curvnet has to be set in three typicall cases: when processing socket-related requests from userspace or from within the kernel; when processing inbound traffic flowing from device drivers to upper layers of the networking stack, and when executing timer-driven networking functions. This change also introduces a DDB subcommand to show the list of all vnet instances. Approved by: julian (mentor) |
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.. | ||
bpf_buffer.c | ||
bpf_buffer.h | ||
bpf_filter.c | ||
bpf_jitter.c | ||
bpf_jitter.h | ||
bpf_zerocopy.c | ||
bpf_zerocopy.h | ||
bpf.c | ||
bpf.h | ||
bpfdesc.h | ||
bridgestp.c | ||
bridgestp.h | ||
ethernet.h | ||
fddi.h | ||
firewire.h | ||
flowtable.c | ||
flowtable.h | ||
ieee8023ad_lacp.c | ||
ieee8023ad_lacp.h | ||
if_arc.h | ||
if_arcsubr.c | ||
if_arp.h | ||
if_atm.h | ||
if_atmsubr.c | ||
if_bridge.c | ||
if_bridgevar.h | ||
if_clone.c | ||
if_clone.h | ||
if_dead.c | ||
if_disc.c | ||
if_dl.h | ||
if_edsc.c | ||
if_ef.c | ||
if_enc.c | ||
if_enc.h | ||
if_ethersubr.c | ||
if_faith.c | ||
if_fddisubr.c | ||
if_fwsubr.c | ||
if_gif.c | ||
if_gif.h | ||
if_gre.c | ||
if_gre.h | ||
if_iso88025subr.c | ||
if_lagg.c | ||
if_lagg.h | ||
if_llatbl.c | ||
if_llatbl.h | ||
if_llc.h | ||
if_loop.c | ||
if_media.c | ||
if_media.h | ||
if_mib.c | ||
if_mib.h | ||
if_sppp.h | ||
if_spppfr.c | ||
if_spppsubr.c | ||
if_stf.c | ||
if_stf.h | ||
if_tap.c | ||
if_tap.h | ||
if_tapvar.h | ||
if_tun.c | ||
if_tun.h | ||
if_types.h | ||
if_var.h | ||
if_vlan_var.h | ||
if_vlan.c | ||
if.c | ||
if.h | ||
iso88025.h | ||
netisr.c | ||
netisr.h | ||
pfil.c | ||
pfil.h | ||
pfkeyv2.h | ||
ppp_defs.h | ||
radix_mpath.c | ||
radix_mpath.h | ||
radix.c | ||
radix.h | ||
raw_cb.c | ||
raw_cb.h | ||
raw_usrreq.c | ||
route.c | ||
route.h | ||
rtsock.c | ||
slcompress.c | ||
slcompress.h | ||
vnet.h | ||
zlib.c | ||
zlib.h |