diff options
Diffstat (limited to 'net/sctp/bind_addr.c')
| -rw-r--r-- | net/sctp/bind_addr.c | 160 |
1 files changed, 109 insertions, 51 deletions
diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c index ceefda025e2..871cdf9567e 100644 --- a/net/sctp/bind_addr.c +++ b/net/sctp/bind_addr.c @@ -21,28 +21,22 @@ * See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License - * along with GNU CC; see the file COPYING. If not, write to - * the Free Software Foundation, 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. + * along with GNU CC; see the file COPYING. If not, see + * <http://www.gnu.org/licenses/>. * * Please send any bug reports or fixes you make to the * email address(es): - * lksctp developers <lksctp-developers@lists.sourceforge.net> - * - * Or submit a bug report through the following website: - * http://www.sf.net/projects/lksctp + * lksctp developers <linux-sctp@vger.kernel.org> * * Written or modified by: * La Monte H.P. Yarroll <piggy@acm.org> * Karl Knutson <karl@athena.chicago.il.us> * Jon Grimm <jgrimm@us.ibm.com> * Daisy Chang <daisyc@us.ibm.com> - * - * Any bugs reported given to us we will try to fix... any fixes shared will - * be incorporated into the next SCTP release. */ #include <linux/types.h> +#include <linux/slab.h> #include <linux/in.h> #include <net/sock.h> #include <net/ipv6.h> @@ -51,8 +45,8 @@ #include <net/sctp/sm.h> /* Forward declarations for internal helpers. */ -static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *, - sctp_scope_t scope, gfp_t gfp, +static int sctp_copy_one_addr(struct net *, struct sctp_bind_addr *, + union sctp_addr *, sctp_scope_t scope, gfp_t gfp, int flags); static void sctp_bind_addr_clean(struct sctp_bind_addr *); @@ -61,22 +55,20 @@ static void sctp_bind_addr_clean(struct sctp_bind_addr *); /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses * in 'src' which have a broader scope than 'scope'. */ -int sctp_bind_addr_copy(struct sctp_bind_addr *dest, +int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, const struct sctp_bind_addr *src, sctp_scope_t scope, gfp_t gfp, int flags) { struct sctp_sockaddr_entry *addr; - struct list_head *pos; int error = 0; /* All addresses share the same port. */ dest->port = src->port; /* Extract the addresses which are relevant for this scope. */ - list_for_each(pos, &src->address_list) { - addr = list_entry(pos, struct sctp_sockaddr_entry, list); - error = sctp_copy_one_addr(dest, &addr->a, scope, + list_for_each_entry(addr, &src->address_list, list) { + error = sctp_copy_one_addr(net, dest, &addr->a, scope, gfp, flags); if (error < 0) goto out; @@ -87,10 +79,8 @@ int sctp_bind_addr_copy(struct sctp_bind_addr *dest, * the assumption that we must be sitting behind a NAT. */ if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) { - list_for_each(pos, &src->address_list) { - addr = list_entry(pos, struct sctp_sockaddr_entry, - list); - error = sctp_copy_one_addr(dest, &addr->a, + list_for_each_entry(addr, &src->address_list, list) { + error = sctp_copy_one_addr(net, dest, &addr->a, SCTP_SCOPE_LINK, gfp, flags); if (error < 0) @@ -115,14 +105,12 @@ int sctp_bind_addr_dup(struct sctp_bind_addr *dest, gfp_t gfp) { struct sctp_sockaddr_entry *addr; - struct list_head *pos; int error = 0; /* All addresses share the same port. */ dest->port = src->port; - list_for_each(pos, &src->address_list) { - addr = list_entry(pos, struct sctp_sockaddr_entry, list); + list_for_each_entry(addr, &src->address_list, list) { error = sctp_add_bind_addr(dest, &addr->a, 1, gfp); if (error < 0) break; @@ -136,8 +124,6 @@ int sctp_bind_addr_dup(struct sctp_bind_addr *dest, */ void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) { - bp->malloced = 0; - INIT_LIST_HEAD(&bp->address_list); bp->port = port; } @@ -145,14 +131,12 @@ void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) /* Dispose of the address list. */ static void sctp_bind_addr_clean(struct sctp_bind_addr *bp) { - struct sctp_sockaddr_entry *addr; - struct list_head *pos, *temp; + struct sctp_sockaddr_entry *addr, *temp; /* Empty the bind address list. */ - list_for_each_safe(pos, temp, &bp->address_list) { - addr = list_entry(pos, struct sctp_sockaddr_entry, list); - list_del(pos); - kfree(addr); + list_for_each_entry_safe(addr, temp, &bp->address_list, list) { + list_del_rcu(&addr->list); + kfree_rcu(addr, rcu); SCTP_DBG_OBJCNT_DEC(addr); } } @@ -162,11 +146,6 @@ void sctp_bind_addr_free(struct sctp_bind_addr *bp) { /* Empty the bind address list. */ sctp_bind_addr_clean(bp); - - if (bp->malloced) { - kfree(bp); - SCTP_DBG_OBJCNT_DEC(bind_addr); - } } /* Add an address to the bind address list in the SCTP_bind_addr structure. */ @@ -176,7 +155,7 @@ int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, struct sctp_sockaddr_entry *addr; /* Add the address to the bind address list. */ - addr = t_new(struct sctp_sockaddr_entry, gfp); + addr = kzalloc(sizeof(*addr), gfp); if (!addr) return -ENOMEM; @@ -192,7 +171,6 @@ int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, addr->valid = 1; INIT_LIST_HEAD(&addr->list); - INIT_RCU_HEAD(&addr->rcu); /* We always hold a socket lock when calling this function, * and that acts as a writer synchronizing lock. @@ -225,7 +203,7 @@ int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr) } if (found) { - call_rcu(&addr->rcu, sctp_local_addr_free); + kfree_rcu(addr, rcu); SCTP_DBG_OBJCNT_DEC(addr); return 0; } @@ -273,8 +251,7 @@ union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, addrparms = retval; - list_for_each(pos, &bp->address_list) { - addr = list_entry(pos, struct sctp_sockaddr_entry, list); + list_for_each_entry(addr, &bp->address_list, list) { af = sctp_get_af_specific(addr->a.v4.sin_family); len = af->to_addr_param(&addr->a, &rawaddr); memcpy(addrparms.v, &rawaddr, len); @@ -355,6 +332,43 @@ int sctp_bind_addr_match(struct sctp_bind_addr *bp, return match; } +/* Does the address 'addr' conflict with any addresses in + * the bp. + */ +int sctp_bind_addr_conflict(struct sctp_bind_addr *bp, + const union sctp_addr *addr, + struct sctp_sock *bp_sp, + struct sctp_sock *addr_sp) +{ + struct sctp_sockaddr_entry *laddr; + int conflict = 0; + struct sctp_sock *sp; + + /* Pick the IPv6 socket as the basis of comparison + * since it's usually a superset of the IPv4. + * If there is no IPv6 socket, then default to bind_addr. + */ + if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6) + sp = bp_sp; + else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6) + sp = addr_sp; + else + sp = bp_sp; + + rcu_read_lock(); + list_for_each_entry_rcu(laddr, &bp->address_list, list) { + if (!laddr->valid) + continue; + + conflict = sp->pf->cmp_addr(&laddr->a, addr, sp); + if (conflict) + break; + } + rcu_read_unlock(); + + return conflict; +} + /* Get the state of the entry in the bind_addr_list */ int sctp_bind_addr_state(const struct sctp_bind_addr *bp, const union sctp_addr *addr) @@ -402,7 +416,7 @@ union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, list_for_each_entry(laddr, &bp->address_list, list) { addr_buf = (union sctp_addr *)addrs; for (i = 0; i < addrcnt; i++) { - addr = (union sctp_addr *)addr_buf; + addr = addr_buf; af = sctp_get_af_specific(addr->v4.sin_family); if (!af) break; @@ -420,16 +434,16 @@ union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, } /* Copy out addresses from the global local address list. */ -static int sctp_copy_one_addr(struct sctp_bind_addr *dest, +static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest, union sctp_addr *addr, sctp_scope_t scope, gfp_t gfp, int flags) { int error = 0; - if (sctp_is_any(addr)) { - error = sctp_copy_local_addr_list(dest, scope, gfp, flags); - } else if (sctp_in_scope(addr, scope)) { + if (sctp_is_any(NULL, addr)) { + error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags); + } else if (sctp_in_scope(net, addr, scope)) { /* Now that the address is in scope, check to see if * the address type is supported by local sock as * well as the remote peer. @@ -447,16 +461,26 @@ static int sctp_copy_one_addr(struct sctp_bind_addr *dest, } /* Is this a wildcard address? */ -int sctp_is_any(const union sctp_addr *addr) +int sctp_is_any(struct sock *sk, const union sctp_addr *addr) { - struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family); + unsigned short fam = 0; + struct sctp_af *af; + + /* Try to get the right address family */ + if (addr->sa.sa_family != AF_UNSPEC) + fam = addr->sa.sa_family; + else if (sk) + fam = sk->sk_family; + + af = sctp_get_af_specific(fam); if (!af) return 0; + return af->is_any(addr); } /* Is 'addr' valid for 'scope'? */ -int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope) +int sctp_in_scope(struct net *net, const union sctp_addr *addr, sctp_scope_t scope) { sctp_scope_t addr_scope = sctp_scope(addr); @@ -470,10 +494,44 @@ int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope) * of requested destination address, sender and receiver * SHOULD include all of its addresses with level greater * than or equal to L. + * + * Address scoping can be selectively controlled via sysctl + * option */ - if (addr_scope <= scope) + switch (net->sctp.scope_policy) { + case SCTP_SCOPE_POLICY_DISABLE: return 1; + case SCTP_SCOPE_POLICY_ENABLE: + if (addr_scope <= scope) + return 1; + break; + case SCTP_SCOPE_POLICY_PRIVATE: + if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope) + return 1; + break; + case SCTP_SCOPE_POLICY_LINK: + if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope) + return 1; + break; + default: + break; + } + + return 0; +} +int sctp_is_ep_boundall(struct sock *sk) +{ + struct sctp_bind_addr *bp; + struct sctp_sockaddr_entry *addr; + + bp = &sctp_sk(sk)->ep->base.bind_addr; + if (sctp_list_single_entry(&bp->address_list)) { + addr = list_entry(bp->address_list.next, + struct sctp_sockaddr_entry, list); + if (sctp_is_any(sk, &addr->a)) + return 1; + } return 0; } |