s/contigous/contiguous/ in comment.

s/reqest/request/ in comment.

Introduce m_set_rcvif and m_reset_rcvif

The API is used to set (or reset) a received interface of a mbuf.
They are counterpart of m_get_rcvif, which will come in another
commit, hide internal of rcvif operation, and reduce the diff of
the upcoming change.

No functional change.

change nfs_boot_sendrecv to take sockaddr_in * instead of mbuf *

fixes m_serv (single mbuf leak) leak in kern/subr_tftproot.c

when calling nfs_boot_sendrecv pass NULL for pointers instead of 0

m_pullup() is called in rcvproc callback functions,
so nfs_boot_sendrecv() should keep track of the head of mbuf chain.
fixes kern/48746

branches: 1.52.14; 1.52.18; 1.52.34; 1.52.36;
Add support to honor MTU settings from DHCP during netboot.

Defines IP_MIN_MTU as 576.

Glanced over quickly by martin@ and joerg@.

branches: 1.51.2; 1.51.4;
Use a function to add extra data to the vendor area so that data added
remains constant for both DISCOVER and REQUEST messages.

Protect against short IP addresses in the DHCP message.

When using DHCP, request the parameters that we need. Fixes PR kern/38830.
Thanks to Tim McIntosh.

correct previous: use %zu for BOOTP_SIZE_(MIN,MAX).
Pointed out by David Holland

buildfix: use %d for BOOTP_SIZE_(MIN,MAX).
Makes i386 ALL kernel build again.

- Silence warning when running with debug enabled
- Remind the administrator about the required DHCP option when some are
missing, instead of silently failing, you stupid computer!

branches: 1.45.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

change nfs boot behaviour to automatically try next boot method if boot information are incomplete to succeed.
That way, it is possible combine static and dhcp boot:
For example, to boot diskless you can specify the nfs-server and the rootpath statically. All other information will be taken via dhcp.

Patch has been presented on port-xen, tech-kern and tech-net:
http://mail-index.netbsd.org/port-xen/2008/10/24/msg004488.html
http://mail-index.netbsd.org/tech-kern/2008/10/24/msg003255.html
http://mail-index.netbsd.org/tech-net/2008/10/24/msg000864.html

No comments, no objections.

branches: 1.43.2;
- ansify function definition
- de- __P
- u_int32_t -> uint32_t

No functional changes.

Convert socket options code to use a sockopt structure
instead of laying everything into an mbuf.

approved by core

When doing pointer arithmetic to compute limit cast bootp to pointer
type of correct signedness. Caught by lint.

branches: 1.40.2; 1.40.4;
Fix compilation with DEBUG_NFS_BOOT_DHCP and ssp.

branches: 1.39.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.38.2;
Merge the socket locking patch:

- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.

With much feedback from matt@ and plunky@.

branches: 1.37.6; 1.37.8;
Constify.

branches: 1.36.8; 1.36.12;
Constify: LLADDR() -> CLLADDR().

branches: 1.35.2; 1.35.6; 1.35.8;
Fix buid (broken by a fix introduced in the wrong file...)

Add the TFTPROOT kernel option for TFTP'ing root RAMdisk at root mount time.
This allows working around situations where a kernel with embedded RAMdisk
cannot be booted by the bootloader because the RAMdisk is too big.

branches: 1.33.2; 1.33.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.32.2; 1.32.4;
remove some __unused in function parameters.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.30.10; 1.30.12;
Don't use DEBUG, add a new DEBUG_NFS_BOOT_DHCP variable to provide more
information. Print more information about what fails.

branches: 1.29.4; 1.29.6; 1.29.8; 1.29.10;
merge ktrace-lwp.

branches: 1.28.4;
nuke trailing whitespace

branches: 1.27.4; 1.27.6;
Eliminate several uses of `curproc' from the socket-layer code and from NFS.

Add a new explicit `struct proc *p' argument to socreate(), sosend().
Use that argument instead of curproc. Follow-on changes to pass that
argument to socreate(), sosend(), and (*so->so_send)() calls.
These changes reviewed and independently recoded by Matt Thomas.

Changes to soreceive() and (*dom->dom_exernalize() from Matt Thomas:
pass soreceive()'s struct uio* uio->uio_procp to unp_externalize().
Eliminate curproc from unp_externalize. Also, now soreceive() uses
its uio->uio_procp value, pass that same value downward to
((pr->pru_usrreq)() calls for consistency, instead of (struct proc * )0.

Similar changes in sys/nfs to eliminate (most) uses of curproc,
either via the req-> r_procp field of a struct nfsreq *req argument,
or by passing down new explicit struct proc * arguments.

Reviewed by: Matt Thomas, posted to tech-kern.
NB: The (*pr->pru_usrreq)() change should be tested on more (all!) protocols.

remove duplicated snprintf(vci, ...)

kill sprintf, use snprintf

branches: 1.24.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Add MBUFTRACE kernel option.
Do a little mbuf rework while here. Change all uses of MGET*(*, M_WAIT, *)
to m_get*(M_WAIT, *). These are not performance critical and making them
call m_get saves considerable space. Add m_clget analogue of MCLGET and
make corresponding change for M_WAIT uses.
Modify netinet, gem, fxp, tulip, nfs to support MBUFTRACE.
Begin to change netstat to use sysctl.

increase IP TTL for BOOTP/DHCP request packets to avoid dumb
routers dropping the packet
(seems to be a problem with Cisco and its "helper-address" feature;
a Cabletron SSR I tested with didn't have this problem)

branches: 1.20.2;
In bootpcheck(), make sure we m_pullup() all the of bootp header that we
actually examine.
While here, toss out home-grown ofs() macro and use offsetof().

Add a NetBSD Vendor Class Identifier option as proposed on tech-net in
message <20020216172527.C23901@dr-evil.shagadelic.org>.

add RCSIDs

branches: 1.17.2; 1.17.6;
It is misleading that the kernel outputs "DHCP server:" followed by
the value of "next-server" from the DHCP (or BOOTP) reply. This is
not the DHCP server's IP address (except by chance), so instead of
"server" make it print "next-server".

branches: 1.16.2;
add a kernel configuration option to set the string passed in bp_file
in diskless BOOTP/DHCP configuration - good for booting different
userland versions depending on the kernel version

Allow nfs root over token ring. Closes PR6629.

branches: 1.14.2;
Don't need to include <sys/conf.h> here.

If server name field is overloaded for other purpose, or it just contains
NULL string, don't use it as server name.

branches: 1.12.2;
print diskless boot related IP addresses in dot notation

branches: 1.11.4;
restructure the diskless NFS boot code to keep track of the used
interface and the address allocated, to roll everything back if the
mount fails:
-put an interface pointer into "struct nfs_diskless" to have it
available for cleanup, don't pass it around anymore where the
"struct nfs_diskless" is already passed
-add a "cleanup" function which shuts the interface down
-in the protocol-specific parts, either return with "everything
ready" or "completely shut down"
-use common functions for interface initialization and shutdown
-add a function to delete all routes associate to an interface
(why is this necessary and not done by ~IFF_UP?)
g/c diskless swap stuff
general cleanup

Fix printf format problems on Alpha.

Fix copyright spacing.

bzero->memset, bcopy->memcpy, bcmp->memcmp

-catch zero and broadcast IP addresses sent by a DHCP server
-warn about them (and other invalid replies)
-print address of BOOTP/DHCP server for better problem tracking
-KNF

Sweep up some miscellaneous leftover lite2 integration shrapnel.

Consolidate NFS_BOOT_* options into opt_nfs_boot.h

Make NFS_BOOT_DHCP work as expected.

Use interface type to select "hardware type" in bootp header.

branches: 1.2.2;
Make this file deserve its name: add DHCP support, conditionalized
with NFS_BOOT_DHCP.
Don't increment xid between retries anymore, it is not required and
it increases the response time in case of a slow server.
Use common code with bootparam boot.

branches: 1.1.2;
Add support for nfs_mountroot using BOOTP based on the contributions
of Tor Egge (closes PR kern/2351).

s/reqest/request/ in comment.

Introduce m_set_rcvif and m_reset_rcvif

The API is used to set (or reset) a received interface of a mbuf.
They are counterpart of m_get_rcvif, which will come in another
commit, hide internal of rcvif operation, and reduce the diff of
the upcoming change.

No functional change.

change nfs_boot_sendrecv to take sockaddr_in * instead of mbuf *

fixes m_serv (single mbuf leak) leak in kern/subr_tftproot.c

when calling nfs_boot_sendrecv pass NULL for pointers instead of 0

m_pullup() is called in rcvproc callback functions,
so nfs_boot_sendrecv() should keep track of the head of mbuf chain.
fixes kern/48746

branches: 1.52.14; 1.52.18; 1.52.34; 1.52.36;
Add support to honor MTU settings from DHCP during netboot.

Defines IP_MIN_MTU as 576.

Glanced over quickly by martin@ and joerg@.

branches: 1.51.2; 1.51.4;
Use a function to add extra data to the vendor area so that data added
remains constant for both DISCOVER and REQUEST messages.

Protect against short IP addresses in the DHCP message.

When using DHCP, request the parameters that we need. Fixes PR kern/38830.
Thanks to Tim McIntosh.

correct previous: use %zu for BOOTP_SIZE_(MIN,MAX).
Pointed out by David Holland

buildfix: use %d for BOOTP_SIZE_(MIN,MAX).
Makes i386 ALL kernel build again.

- Silence warning when running with debug enabled
- Remind the administrator about the required DHCP option when some are
missing, instead of silently failing, you stupid computer!

branches: 1.45.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

change nfs boot behaviour to automatically try next boot method if boot information are incomplete to succeed.
That way, it is possible combine static and dhcp boot:
For example, to boot diskless you can specify the nfs-server and the rootpath statically. All other information will be taken via dhcp.

Patch has been presented on port-xen, tech-kern and tech-net:
http://mail-index.netbsd.org/port-xen/2008/10/24/msg004488.html
http://mail-index.netbsd.org/tech-kern/2008/10/24/msg003255.html
http://mail-index.netbsd.org/tech-net/2008/10/24/msg000864.html

No comments, no objections.

branches: 1.43.2;
- ansify function definition
- de- __P
- u_int32_t -> uint32_t

No functional changes.

Convert socket options code to use a sockopt structure
instead of laying everything into an mbuf.

approved by core

When doing pointer arithmetic to compute limit cast bootp to pointer
type of correct signedness. Caught by lint.

branches: 1.40.2; 1.40.4;
Fix compilation with DEBUG_NFS_BOOT_DHCP and ssp.

branches: 1.39.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.38.2;
Merge the socket locking patch:

- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.

With much feedback from matt@ and plunky@.

branches: 1.37.6; 1.37.8;
Constify.

branches: 1.36.8; 1.36.12;
Constify: LLADDR() -> CLLADDR().

branches: 1.35.2; 1.35.6; 1.35.8;
Fix buid (broken by a fix introduced in the wrong file...)

Add the TFTPROOT kernel option for TFTP'ing root RAMdisk at root mount time.
This allows working around situations where a kernel with embedded RAMdisk
cannot be booted by the bootloader because the RAMdisk is too big.

branches: 1.33.2; 1.33.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.32.2; 1.32.4;
remove some __unused in function parameters.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.30.10; 1.30.12;
Don't use DEBUG, add a new DEBUG_NFS_BOOT_DHCP variable to provide more
information. Print more information about what fails.

branches: 1.29.4; 1.29.6; 1.29.8; 1.29.10;
merge ktrace-lwp.

branches: 1.28.4;
nuke trailing whitespace

branches: 1.27.4; 1.27.6;
Eliminate several uses of `curproc' from the socket-layer code and from NFS.

Add a new explicit `struct proc *p' argument to socreate(), sosend().
Use that argument instead of curproc. Follow-on changes to pass that
argument to socreate(), sosend(), and (*so->so_send)() calls.
These changes reviewed and independently recoded by Matt Thomas.

Changes to soreceive() and (*dom->dom_exernalize() from Matt Thomas:
pass soreceive()'s struct uio* uio->uio_procp to unp_externalize().
Eliminate curproc from unp_externalize. Also, now soreceive() uses
its uio->uio_procp value, pass that same value downward to
((pr->pru_usrreq)() calls for consistency, instead of (struct proc * )0.

Similar changes in sys/nfs to eliminate (most) uses of curproc,
either via the req-> r_procp field of a struct nfsreq *req argument,
or by passing down new explicit struct proc * arguments.

Reviewed by: Matt Thomas, posted to tech-kern.
NB: The (*pr->pru_usrreq)() change should be tested on more (all!) protocols.

remove duplicated snprintf(vci, ...)

kill sprintf, use snprintf

branches: 1.24.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Add MBUFTRACE kernel option.
Do a little mbuf rework while here. Change all uses of MGET*(*, M_WAIT, *)
to m_get*(M_WAIT, *). These are not performance critical and making them
call m_get saves considerable space. Add m_clget analogue of MCLGET and
make corresponding change for M_WAIT uses.
Modify netinet, gem, fxp, tulip, nfs to support MBUFTRACE.
Begin to change netstat to use sysctl.

increase IP TTL for BOOTP/DHCP request packets to avoid dumb
routers dropping the packet
(seems to be a problem with Cisco and its "helper-address" feature;
a Cabletron SSR I tested with didn't have this problem)

branches: 1.20.2;
In bootpcheck(), make sure we m_pullup() all the of bootp header that we
actually examine.
While here, toss out home-grown ofs() macro and use offsetof().

Add a NetBSD Vendor Class Identifier option as proposed on tech-net in
message <20020216172527.C23901@dr-evil.shagadelic.org>.

add RCSIDs

branches: 1.17.2; 1.17.6;
It is misleading that the kernel outputs "DHCP server:" followed by
the value of "next-server" from the DHCP (or BOOTP) reply. This is
not the DHCP server's IP address (except by chance), so instead of
"server" make it print "next-server".

branches: 1.16.2;
add a kernel configuration option to set the string passed in bp_file
in diskless BOOTP/DHCP configuration - good for booting different
userland versions depending on the kernel version

Allow nfs root over token ring. Closes PR6629.

branches: 1.14.2;
Don't need to include <sys/conf.h> here.

If server name field is overloaded for other purpose, or it just contains
NULL string, don't use it as server name.

branches: 1.12.2;
print diskless boot related IP addresses in dot notation

branches: 1.11.4;
restructure the diskless NFS boot code to keep track of the used
interface and the address allocated, to roll everything back if the
mount fails:
-put an interface pointer into "struct nfs_diskless" to have it
available for cleanup, don't pass it around anymore where the
"struct nfs_diskless" is already passed
-add a "cleanup" function which shuts the interface down
-in the protocol-specific parts, either return with "everything
ready" or "completely shut down"
-use common functions for interface initialization and shutdown
-add a function to delete all routes associate to an interface
(why is this necessary and not done by ~IFF_UP?)
g/c diskless swap stuff
general cleanup

Fix printf format problems on Alpha.

Fix copyright spacing.

bzero->memset, bcopy->memcpy, bcmp->memcmp

-catch zero and broadcast IP addresses sent by a DHCP server
-warn about them (and other invalid replies)
-print address of BOOTP/DHCP server for better problem tracking
-KNF

Sweep up some miscellaneous leftover lite2 integration shrapnel.

Consolidate NFS_BOOT_* options into opt_nfs_boot.h

Make NFS_BOOT_DHCP work as expected.

Use interface type to select "hardware type" in bootp header.

branches: 1.2.2;
Make this file deserve its name: add DHCP support, conditionalized
with NFS_BOOT_DHCP.
Don't increment xid between retries anymore, it is not required and
it increases the response time in case of a slow server.
Use common code with bootparam boot.

branches: 1.1.2;
Add support for nfs_mountroot using BOOTP based on the contributions
of Tor Egge (closes PR kern/2351).

Introduce m_set_rcvif and m_reset_rcvif

The API is used to set (or reset) a received interface of a mbuf.
They are counterpart of m_get_rcvif, which will come in another
commit, hide internal of rcvif operation, and reduce the diff of
the upcoming change.

No functional change.

change nfs_boot_sendrecv to take sockaddr_in * instead of mbuf *

fixes m_serv (single mbuf leak) leak in kern/subr_tftproot.c

when calling nfs_boot_sendrecv pass NULL for pointers instead of 0

m_pullup() is called in rcvproc callback functions,
so nfs_boot_sendrecv() should keep track of the head of mbuf chain.
fixes kern/48746

branches: 1.52.14; 1.52.34; 1.52.36;
Add support to honor MTU settings from DHCP during netboot.

Defines IP_MIN_MTU as 576.

Glanced over quickly by martin@ and joerg@.

branches: 1.51.2; 1.51.4;
Use a function to add extra data to the vendor area so that data added
remains constant for both DISCOVER and REQUEST messages.

Protect against short IP addresses in the DHCP message.

When using DHCP, request the parameters that we need. Fixes PR kern/38830.
Thanks to Tim McIntosh.

correct previous: use %zu for BOOTP_SIZE_(MIN,MAX).
Pointed out by David Holland

buildfix: use %d for BOOTP_SIZE_(MIN,MAX).
Makes i386 ALL kernel build again.

- Silence warning when running with debug enabled
- Remind the administrator about the required DHCP option when some are
missing, instead of silently failing, you stupid computer!

branches: 1.45.4;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

change nfs boot behaviour to automatically try next boot method if boot information are incomplete to succeed.
That way, it is possible combine static and dhcp boot:
For example, to boot diskless you can specify the nfs-server and the rootpath statically. All other information will be taken via dhcp.

Patch has been presented on port-xen, tech-kern and tech-net:
http://mail-index.netbsd.org/port-xen/2008/10/24/msg004488.html
http://mail-index.netbsd.org/tech-kern/2008/10/24/msg003255.html
http://mail-index.netbsd.org/tech-net/2008/10/24/msg000864.html

No comments, no objections.

branches: 1.43.2;
- ansify function definition
- de- __P
- u_int32_t -> uint32_t

No functional changes.

Convert socket options code to use a sockopt structure
instead of laying everything into an mbuf.

approved by core

When doing pointer arithmetic to compute limit cast bootp to pointer
type of correct signedness. Caught by lint.

branches: 1.40.2; 1.40.4;
Fix compilation with DEBUG_NFS_BOOT_DHCP and ssp.

branches: 1.39.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.38.2;
Merge the socket locking patch:

- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.

With much feedback from matt@ and plunky@.

branches: 1.37.6; 1.37.8;
Constify.

branches: 1.36.8; 1.36.12;
Constify: LLADDR() -> CLLADDR().

branches: 1.35.2; 1.35.6; 1.35.8;
Fix buid (broken by a fix introduced in the wrong file...)

Add the TFTPROOT kernel option for TFTP'ing root RAMdisk at root mount time.
This allows working around situations where a kernel with embedded RAMdisk
cannot be booted by the bootloader because the RAMdisk is too big.

branches: 1.33.2; 1.33.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.32.2; 1.32.4;
remove some __unused in function parameters.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.30.10; 1.30.12;
Don't use DEBUG, add a new DEBUG_NFS_BOOT_DHCP variable to provide more
information. Print more information about what fails.

branches: 1.29.4; 1.29.6; 1.29.8; 1.29.10;
merge ktrace-lwp.

branches: 1.28.4;
nuke trailing whitespace

branches: 1.27.4; 1.27.6;
Eliminate several uses of `curproc' from the socket-layer code and from NFS.

Add a new explicit `struct proc *p' argument to socreate(), sosend().
Use that argument instead of curproc. Follow-on changes to pass that
argument to socreate(), sosend(), and (*so->so_send)() calls.
These changes reviewed and independently recoded by Matt Thomas.

Changes to soreceive() and (*dom->dom_exernalize() from Matt Thomas:
pass soreceive()'s struct uio* uio->uio_procp to unp_externalize().
Eliminate curproc from unp_externalize. Also, now soreceive() uses
its uio->uio_procp value, pass that same value downward to
((pr->pru_usrreq)() calls for consistency, instead of (struct proc * )0.

Similar changes in sys/nfs to eliminate (most) uses of curproc,
either via the req-> r_procp field of a struct nfsreq *req argument,
or by passing down new explicit struct proc * arguments.

Reviewed by: Matt Thomas, posted to tech-kern.
NB: The (*pr->pru_usrreq)() change should be tested on more (all!) protocols.

remove duplicated snprintf(vci, ...)

kill sprintf, use snprintf

branches: 1.24.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Add MBUFTRACE kernel option.
Do a little mbuf rework while here. Change all uses of MGET*(*, M_WAIT, *)
to m_get*(M_WAIT, *). These are not performance critical and making them
call m_get saves considerable space. Add m_clget analogue of MCLGET and
make corresponding change for M_WAIT uses.
Modify netinet, gem, fxp, tulip, nfs to support MBUFTRACE.
Begin to change netstat to use sysctl.

increase IP TTL for BOOTP/DHCP request packets to avoid dumb
routers dropping the packet
(seems to be a problem with Cisco and its "helper-address" feature;
a Cabletron SSR I tested with didn't have this problem)

branches: 1.20.2;
In bootpcheck(), make sure we m_pullup() all the of bootp header that we
actually examine.
While here, toss out home-grown ofs() macro and use offsetof().

Add a NetBSD Vendor Class Identifier option as proposed on tech-net in
message <20020216172527.C23901@dr-evil.shagadelic.org>.

add RCSIDs

branches: 1.17.2; 1.17.6;
It is misleading that the kernel outputs "DHCP server:" followed by
the value of "next-server" from the DHCP (or BOOTP) reply. This is
not the DHCP server's IP address (except by chance), so instead of
"server" make it print "next-server".

branches: 1.16.2;
add a kernel configuration option to set the string passed in bp_file
in diskless BOOTP/DHCP configuration - good for booting different
userland versions depending on the kernel version

Allow nfs root over token ring. Closes PR6629.

branches: 1.14.2;
Don't need to include <sys/conf.h> here.

If server name field is overloaded for other purpose, or it just contains
NULL string, don't use it as server name.

branches: 1.12.2;
print diskless boot related IP addresses in dot notation

branches: 1.11.4;
restructure the diskless NFS boot code to keep track of the used
interface and the address allocated, to roll everything back if the
mount fails:
-put an interface pointer into "struct nfs_diskless" to have it
available for cleanup, don't pass it around anymore where the
"struct nfs_diskless" is already passed
-add a "cleanup" function which shuts the interface down
-in the protocol-specific parts, either return with "everything
ready" or "completely shut down"
-use common functions for interface initialization and shutdown
-add a function to delete all routes associate to an interface
(why is this necessary and not done by ~IFF_UP?)
g/c diskless swap stuff
general cleanup

Fix printf format problems on Alpha.

Fix copyright spacing.

bzero->memset, bcopy->memcpy, bcmp->memcmp

-catch zero and broadcast IP addresses sent by a DHCP server
-warn about them (and other invalid replies)
-print address of BOOTP/DHCP server for better problem tracking
-KNF

Sweep up some miscellaneous leftover lite2 integration shrapnel.

Consolidate NFS_BOOT_* options into opt_nfs_boot.h

Make NFS_BOOT_DHCP work as expected.

Use interface type to select "hardware type" in bootp header.

branches: 1.2.2;
Make this file deserve its name: add DHCP support, conditionalized
with NFS_BOOT_DHCP.
Don't increment xid between retries anymore, it is not required and
it increases the response time in case of a slow server.
Use common code with bootparam boot.

branches: 1.1.2;
Add support for nfs_mountroot using BOOTP based on the contributions
of Tor Egge (closes PR kern/2351).