support for specifying an accept filter for a service (mostly as a usage
example, but it can be handy for other things). Manual pages to follow
in a day or so.
OK core@.
- 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@.
appended while the receiver is blocked, the sockbuf will be corrupted.
Dequeue control messages from the sockbuf and sync its state in one
pass. Only then process the control messages. From FreeBSD.
This is for netsmb which wants to poll sockets directly.
- When polling a socket, first check for pending I/O without acquring any
locks. If no I/O seems to be pending, acquire locks/spl and check again
doing selrecord() if necessary.
- Add a lot of missing selinit() and seldestroy() calls.
- Merge selwakeup() and selnotify() calls into a single selnotify().
- Add an additional 'events' argument to selnotify() call. It will
indicate which event (POLL_IN, POLL_OUT, etc) happen. If unknown,
zero may be used.
Note: please pass appropriate value of 'events' where possible.
Proposed on: <tech-kern>
tells a socket that it should both add a protocol header to tx'd
datagrams and remove the header from rx'd datagrams:
int onoff = 1, s = socket(...);
setsockopt(s, SOL_SOCKET, SO_NOHEADER, &onoff);
2) Add an implementation of (SOL_SOCKET, SO_NOHEADER) for raw IPv4
sockets.
3) Reorganize the protocols' pr_ctloutput implementations a bit.
Consistently return ENOPROTOOPT when an option is unsupported,
and EINVAL if a supported option's arguments are incorrect.
Reorganize the flow of code so that it's more clear how/when
options are passed down the stack until they are handled.
Shorten some pr_ctloutput staircases for readability.
4) Extract common mbuf code into subroutines, add new sockaddr
methods, and introduce a new subroutine, fsocreate(), for reuse
later; use it first in sys_socket():
struct mbuf *m_getsombuf(struct socket *so)
Create an mbuf and make its owner the socket `so'.
struct mbuf *m_intopt(struct socket *so, int val)
Create an mbuf, make its owner the socket `so', put the
int `val' into it, and set its length to sizeof(int).
int fsocreate(..., int *fd)
Create a socket, a la socreate(9), put the socket into the
given LWP's descriptor table, return the descriptor at `fd'
on success.
void *sockaddr_addr(struct sockaddr *sa, socklen_t *slenp)
const void *sockaddr_const_addr(const struct sockaddr *sa, socklen_t *slenp)
Extract a pointer to the address part of a sockaddr. Write
the length of the address part at `slenp', if `slenp' is
not NULL.
socklen_t sockaddr_getlen(const struct sockaddr *sa)
Return the length of a sockaddr. This just evaluates to
sa->sa_len. I only add this for consistency with code that
appears in a portable userland library that I am going to
import.
const struct sockaddr *sockaddr_any(const struct sockaddr *sa)
Return the "don't care" sockaddr in the same family as
`sa'. This is the address a client should sobind(9) if it
does not care the source address and, if applicable, the
port et cetera that it uses.
const void *sockaddr_anyaddr(const struct sockaddr *sa, socklen_t *slenp)
Return the "don't care" sockaddr in the same family as
`sa'. This is the address a client should sobind(9) if it
does not care the source address and, if applicable, the
port et cetera that it uses.
route_in6, struct route_iso), replacing all caches with a struct
route.
The principle benefit of this change is that all of the protocol
families can benefit from route cache-invalidation, which is
necessary for correct routing. Route-cache invalidation fixes an
ancient PR, kern/3508, at long last; it fixes various other PRs,
also.
Discussions with and ideas from Joerg Sonnenberger influenced this
work tremendously. Of course, all design oversights and bugs are
mine.
DETAILS
1 I added to each address family a pool of sockaddrs. I have
introduced routines for allocating, copying, and duplicating,
and freeing sockaddrs:
struct sockaddr *sockaddr_alloc(sa_family_t af, int flags);
struct sockaddr *sockaddr_copy(struct sockaddr *dst,
const struct sockaddr *src);
struct sockaddr *sockaddr_dup(const struct sockaddr *src, int flags);
void sockaddr_free(struct sockaddr *sa);
sockaddr_alloc() returns either a sockaddr from the pool belonging
to the specified family, or NULL if the pool is exhausted. The
returned sockaddr has the right size for that family; sa_family
and sa_len fields are initialized to the family and sockaddr
length---e.g., sa_family = AF_INET and sa_len = sizeof(struct
sockaddr_in). sockaddr_free() puts the given sockaddr back into
its family's pool.
sockaddr_dup() and sockaddr_copy() work analogously to strdup()
and strcpy(), respectively. sockaddr_copy() KASSERTs that the
family of the destination and source sockaddrs are alike.
The 'flags' argumet for sockaddr_alloc() and sockaddr_dup() is
passed directly to pool_get(9).
2 I added routines for initializing sockaddrs in each address
family, sockaddr_in_init(), sockaddr_in6_init(), sockaddr_iso_init(),
etc. They are fairly self-explanatory.
3 structs route_in6 and route_iso are no more. All protocol families
use struct route. I have changed the route cache, 'struct route',
so that it does not contain storage space for a sockaddr. Instead,
struct route points to a sockaddr coming from the pool the sockaddr
belongs to. I added a new method to struct route, rtcache_setdst(),
for setting the cache destination:
int rtcache_setdst(struct route *, const struct sockaddr *);
rtcache_setdst() returns 0 on success, or ENOMEM if no memory is
available to create the sockaddr storage.
It is now possible for rtcache_getdst() to return NULL if, say,
rtcache_setdst() failed. I check the return value for NULL
everywhere in the kernel.
4 Each routing domain (struct domain) has a list of live route
caches, dom_rtcache. rtflushall(sa_family_t af) looks up the
domain indicated by 'af', walks the domain's list of route caches
and invalidates each one.
allowed. It takes three int * arguments indicating domain, type, and
protocol. Replace previous KAUTH_REQ_NETWORK_SOCKET_RAWSOCK with it (but
keep it still).
Places that used to explicitly check for privileged context now don't
need it anymore, so I replaced these with XXX comment indiacting it for
future reference.
Documented and updated examples as well.
Brought up on tech-kern@ some ~2 months ago, didn't seem to be an
objection; brought up again recently and no objection either... this is
not too intrusive and I've been running with this for a while.
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