Andre Oppermann 9b932e9e04 Convert ipfw to use PFIL_HOOKS. This is change is transparent to userland ... and preserves the ipfw ABI. The ipfw core packet inspection and filtering functions have not been changed, only how ipfw is invoked is different. However there are many changes how ipfw is and its add-on's are handled: In general ipfw is now called through the PFIL_HOOKS and most associated magic, that was in ip_input() or ip_output() previously, is now done in ipfw_check_[in|out]() in the ipfw PFIL handler. IPDIVERT is entirely handled within the ipfw PFIL handlers. A packet to be diverted is checked if it is fragmented, if yes, ip_reass() gets in for reassembly. If not, or all fragments arrived and the packet is complete, divert_packet is called directly. For 'tee' no reassembly attempt is made and a copy of the packet is sent to the divert socket unmodified. The original packet continues its way through ip_input/output(). ipfw 'forward' is done via m_tag's. The ipfw PFIL handlers tag the packet with the new destination sockaddr_in. A check if the new destination is a local IP address is made and the m_flags are set appropriately. ip_input() and ip_output() have some more work to do here. For ip_input() the m_flags are checked and a packet for us is directly sent to the 'ours' section for further processing. Destination changes on the input path are only tagged and the 'srcrt' flag to ip_forward() is set to disable destination checks and ICMP replies at this stage. The tag is going to be handled on output. ip_output() again checks for m_flags and the 'ours' tag. If found, the packet will be dropped back to the IP netisr where it is going to be picked up by ip_input() again and the directly sent to the 'ours' section. When only the destination changes, the route's 'dst' is overwritten with the new destination from the forward m_tag. Then it jumps back at the route lookup again and skips the firewall check because it has been marked with M_SKIP_FIREWALL. ipfw 'forward' has to be compiled into the kernel with 'option IPFIREWALL_FORWARD' to enable it. DUMMYNET is entirely handled within the ipfw PFIL handlers. A packet for a dummynet pipe or queue is directly sent to dummynet_io(). Dummynet will then inject it back into ip_input/ip_output() after it has served its time. Dummynet packets are tagged and will continue from the next rule when they hit the ipfw PFIL handlers again after re-injection. BRIDGING and IPFW_ETHER are not changed yet and use ipfw_chk() directly as they did before. Later this will be changed to dedicated ETHER PFIL_HOOKS. More detailed changes to the code: conf/files Add netinet/ip_fw_pfil.c. conf/options Add IPFIREWALL_FORWARD option. modules/ipfw/Makefile Add ip_fw_pfil.c. net/bridge.c Disable PFIL_HOOKS if ipfw for bridging is active. Bridging ipfw is still directly invoked to handle layer2 headers and packets would get a double ipfw when run through PFIL_HOOKS as well. netinet/ip_divert.c Removed divert_clone() function. It is no longer used. netinet/ip_dummynet.[ch] Neither the route 'ro' nor the destination 'dst' need to be stored while in dummynet transit. Structure members and associated macros are removed. netinet/ip_fastfwd.c Removed all direct ipfw handling code and replace it with the new 'ipfw forward' handling code. netinet/ip_fw.h Removed 'ro' and 'dst' from struct ip_fw_args. netinet/ip_fw2.c (Re)moved some global variables and the module handling. netinet/ip_fw_pfil.c New file containing the ipfw PFIL handlers and module initialization. netinet/ip_input.c Removed all direct ipfw handling code and replace it with the new 'ipfw forward' handling code. ip_forward() does not longer require the 'next_hop' struct sockaddr_in argument. Disable early checks if 'srcrt' is set. netinet/ip_output.c Removed all direct ipfw handling code and replace it with the new 'ipfw forward' handling code. netinet/ip_var.h Add ip_reass() as general function. (Used from ipfw PFIL handlers for IPDIVERT.) netinet/raw_ip.c Directly check if ipfw and dummynet control pointers are active. netinet/tcp_input.c Rework the 'ipfw forward' to local code to work with the new way of forward tags. netinet/tcp_sack.c Remove include 'opt_ipfw.h' which is not needed here. sys/mbuf.h Remove m_claim_next() macro which was exclusively for ipfw 'forward' and is no longer needed. Approved by: re (scottl)		2004-08-17 22:05:54 +00:00
..
atm	This is the netgraph node framework for the user side call control	2004-08-12 14:22:00 +00:00
bluetooth	Introduce ng_hci_inquiry_response structure and use it in the hccontrol(8)	2004-08-10 00:38:50 +00:00
netgraph.h	When making a peer of unknown type framework tries to load module	2004-07-27 20:30:56 +00:00
ng_async.c	Consistently use __inline instead of __inline__ as the former is an empty macro	2004-07-04 16:11:03 +00:00
ng_async.h
ng_atmllc.c
ng_atmllc.h
ng_base.c	When making a peer of unknown type framework tries to load module	2004-07-27 20:30:56 +00:00
ng_bpf.c	Avoid calling bpf_filter() with len == 0, which causes a change in semantics	2004-06-23 02:37:10 +00:00
ng_bpf.h
ng_bridge.c	Convert ipfw to use PFIL_HOOKS. This is change is transparent to userland	2004-08-17 22:05:54 +00:00
ng_bridge.h
ng_cisco.c
ng_cisco.h
ng_device.c	In ng_device_newhook():	2004-07-20 13:16:17 +00:00
ng_device.h	Remove 3rd clause from the licence.	2004-06-29 15:46:12 +00:00
ng_echo.c
ng_echo.h
ng_eiface.c	Introduce a new mutex, ng_eiface_mtx, to protect the global unit list	2004-07-14 20:26:29 +00:00
ng_eiface.h
ng_etf.c	Having moved metadata usage to mbuf tags, remove code that supports	2004-06-26 22:24:16 +00:00
ng_etf.h
ng_ether.c	Avoid casts as lvalues.	2004-07-28 06:59:55 +00:00
ng_ether.h
ng_fec.c	Avoid casts as lvalues.	2004-07-28 06:59:55 +00:00
ng_fec.h
ng_frame_relay.c	Mark 'makeup' in ng_frame_relay as const, as its values are immutable.	2004-07-12 04:35:42 +00:00
ng_frame_relay.h
ng_gif_demux.c	Consistently use __inline instead of __inline__ as the former is an empty macro	2004-07-04 16:11:03 +00:00
ng_gif_demux.h
ng_gif.c	Avoid casts as lvalues.	2004-07-28 06:59:55 +00:00
ng_gif.h
ng_hole.c
ng_hole.h
ng_hub.c	Having moved metadata usage to mbuf tags, remove code that supports	2004-06-26 22:24:16 +00:00
ng_hub.h
ng_iface.c	Introduce a new mutex, ng_iface_mtx, to protect the global unit list	2004-07-14 20:24:21 +00:00
ng_iface.h
ng_ip_input.c
ng_ip_input.h
ng_ksocket.c	Convert Netgraph to use mbuf tags to pass its meta information around.	2004-06-25 19:22:05 +00:00
ng_ksocket.h	oops from Gleb..	2004-06-25 22:59:59 +00:00
ng_l2tp.c	Implement minimalistic L2TP sessions statistics and correct man page	2004-08-03 06:52:55 +00:00
ng_l2tp.h	Implement minimalistic L2TP sessions statistics and correct man page	2004-08-03 06:52:55 +00:00
ng_lmi.c	Convert Netgraph to use mbuf tags to pass its meta information around.	2004-06-25 19:22:05 +00:00
ng_lmi.h
ng_message.h
ng_mppc.c
ng_mppc.h
ng_one2many.c	Having moved metadata usage to mbuf tags, remove code that supports	2004-06-26 22:24:16 +00:00
ng_one2many.h
ng_parse.c	Avoid casts as lvalues.	2004-07-28 06:59:55 +00:00
ng_parse.h
ng_ppp.c	Do not change link[n].conf.latency for internal usage but have	2004-08-03 06:34:55 +00:00
ng_ppp.h
ng_pppoe.c	Another stupid error from my side. PPPOE_NONSTANDARD was first defined	2004-08-01 20:39:33 +00:00
ng_pppoe.h	When node is server serve both standard RFC2516 and non-standard 3Com	2004-07-27 19:47:13 +00:00
ng_pptpgre.c
ng_pptpgre.h
ng_rfc1490.c	Make the frameworkl responsible for not passing the nodes a NULL mbuf pointer.	2004-06-25 21:11:14 +00:00
ng_rfc1490.h
ng_sample.c	Address node in a less complex way.	2004-07-29 08:05:02 +00:00
ng_sample.h
ng_socket.c	Fix a stupid error in my previous commit, which broke operation	2004-07-31 21:32:55 +00:00
ng_socket.h
ng_socketvar.h
ng_source.c	Slight cosmetic changes.	2004-07-20 17:15:38 +00:00
ng_source.h
ng_split.c
ng_split.h
ng_sppp.c	Consistently use __inline instead of __inline__ as the former is an empty macro	2004-07-04 16:11:03 +00:00
ng_sppp.h
ng_tee.c	Having moved metadata usage to mbuf tags, remove code that supports	2004-06-26 22:24:16 +00:00
ng_tee.h
ng_tty.c	Add a mutex ng_tty_mtx to protect the global variable ngt_unit. Note	2004-07-14 20:31:05 +00:00
ng_tty.h
ng_UI.c	Make the frameworkl responsible for not passing the nodes a NULL mbuf pointer.	2004-06-25 21:11:14 +00:00
ng_UI.h
ng_vjc.c
ng_vjc.h
ng_vlan.c
ng_vlan.h
NOTES