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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [sctp/] [ipv6.c] - Blame information for rev 1275

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/* SCTP kernel reference Implementation
 * Copyright (c) 2001 Nokia, Inc.
 * Copyright (c) 2001 La Monte H.P. Yarroll
 * Copyright (c) 2002-2003 International Business Machines, Corp.
 * Copyright (c) 2002-2003 Intel Corp.
 *
 * This file is part of the SCTP kernel reference Implementation
 *
 * SCTP over IPv6.
 *
 * The SCTP reference implementation is free software;
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * The SCTP reference implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 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.
 *
 * 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
 *
 * Written or modified by:
 *    Le Yanqun             <yanqun.le@nokia.com>
 *    Hui Huang             <hui.huang@nokia.com>
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Sridhar Samudrala     <sri@us.ibm.com>
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *    Ardelle Fan           <ardelle.fan@intel.com>
 *
 * Based on:
 *      linux/net/ipv6/tcp_ipv6.c
 *
 * Any bugs reported given to us we will try to fix... any fixes shared will
 * be incorporated into the next SCTP release.
 */
 
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/sched.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/ipsec.h>
 
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>
#include <linux/seq_file.h>
 
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/ndisc.h>
#include <net/ipv6.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/inet_common.h>
#include <net/inet_ecn.h>
#include <net/sctp/sctp.h>
 
#include <asm/uaccess.h>
 
extern struct notifier_block sctp_inetaddr_notifier;
 
/* FIXME: This macro needs to be moved to a common header file. */
#define NIP6(addr) \
        ntohs((addr)->s6_addr16[0]), \
        ntohs((addr)->s6_addr16[1]), \
        ntohs((addr)->s6_addr16[2]), \
        ntohs((addr)->s6_addr16[3]), \
        ntohs((addr)->s6_addr16[4]), \
        ntohs((addr)->s6_addr16[5]), \
        ntohs((addr)->s6_addr16[6]), \
        ntohs((addr)->s6_addr16[7])
 
/* ICMP error handler. */
void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                 int type, int code, int offset, __u32 info)
{
        struct inet6_dev *idev;
        struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
        struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
        struct sock *sk;
        struct sctp_endpoint *ep;
        struct sctp_association *asoc;
        struct sctp_transport *transport;
        struct ipv6_pinfo *np;
        char *saveip, *savesctp;
        int err;
 
        idev = in6_dev_get(skb->dev);
 
        /* Fix up skb to look at the embedded net header. */
        saveip = skb->nh.raw;
        savesctp  = skb->h.raw;
        skb->nh.ipv6h = iph;
        skb->h.raw = (char *)sh;
        sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
        /* Put back, the original pointers. */
        skb->nh.raw = saveip;
        skb->h.raw = savesctp;
        if (!sk) {
                ICMP6_INC_STATS_BH(Icmp6InErrors);
                goto out;
        }
 
        /* Warning:  The sock lock is held.  Remember to call
         * sctp_err_finish!
         */
 
        switch (type) {
        case ICMPV6_PKT_TOOBIG:
                sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
                goto out_unlock;
        default:
                break;
        }
 
        np = inet6_sk(sk);
        icmpv6_err_convert(type, code, &err);
        if (!sock_owned_by_user(sk) && np->recverr) {
                sk->sk_err = err;
                sk->sk_error_report(sk);
        } else {  /* Only an error on timeout */
                sk->sk_err_soft = err;
        }
 
out_unlock:
        sctp_err_finish(sk, ep, asoc);
out:
        if (likely(idev != NULL))
                in6_dev_put(idev);
}
 
/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
                        int ipfragok)
{
        struct sock *sk = skb->sk;
        struct ipv6_pinfo *np = inet6_sk(sk);
        struct flowi fl;
 
        memset(&fl, 0, sizeof(fl));
 
        fl.proto = sk->sk_protocol;
 
        /* Fill in the dest address from the route entry passed with the skb
         * and the source address from the transport.
         */
        fl.fl6_dst = &transport->ipaddr.v6.sin6_addr;
        fl.fl6_src = &transport->saddr.v6.sin6_addr;
 
        fl.fl6_flowlabel = np->flow_label;
        IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
        if (ipv6_addr_type(fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
                fl.oif = transport->saddr.v6.sin6_scope_id;
        else
                fl.oif = sk->sk_bound_dev_if;
        fl.uli_u.ports.sport = sk->sport;
        fl.uli_u.ports.dport = transport->ipaddr.v6.sin6_port;
 
        if (np->opt && np->opt->srcrt) {
                struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
                fl.fl6_dst = rt0->addr;
        }
 
        SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
                          "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
                          "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
                          __FUNCTION__, skb, skb->len,
                          NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
 
        SCTP_INC_STATS(SctpOutSCTPPacks);
 
        return ip6_xmit(sk, skb, &fl, np->opt);
}
 
/* Returns the dst cache entry for the given source and destination ip
 * addresses.
 */
struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
                                  union sctp_addr *daddr,
                                  union sctp_addr *saddr)
{
        struct dst_entry *dst;
        struct flowi fl;
 
        memset(&fl, 0, sizeof(fl));
        fl.fl6_dst = &daddr->v6.sin6_addr;
        if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
                fl.oif = daddr->v6.sin6_scope_id;
 
 
        SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
                          __FUNCTION__, NIP6(fl.fl6_dst));
 
        if (saddr) {
                fl.fl6_src = &saddr->v6.sin6_addr;
                SCTP_DEBUG_PRINTK(
                        "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
                        NIP6(fl.fl6_src));
        }
 
        dst = ip6_route_output(NULL, &fl);
        if (dst) {
                struct rt6_info *rt;
                rt = (struct rt6_info *)dst;
                SCTP_DEBUG_PRINTK(
                        "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
                        "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
                        NIP6(&rt->rt6i_dst.addr), NIP6(&rt->rt6i_src.addr));
        } else {
                SCTP_DEBUG_PRINTK("NO ROUTE\n");
        }
 
        return dst;
}
 
/* Returns the number of consecutive initial bits that match in the 2 ipv6
 * addresses.
 */
static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
                                         union sctp_addr *s2)
{
        struct in6_addr *a1 = &s1->v6.sin6_addr;
        struct in6_addr *a2 = &s2->v6.sin6_addr;
        int i, j;
 
        for (i = 0; i < 4 ; i++) {
                __u32 a1xora2;
 
                a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
 
                if ((j = fls(ntohl(a1xora2))))
                        return (i * 32 + 32 - j);
        }
 
        return (i*32);
}
 
/* Fills in the source address(saddr) based on the destination address(daddr)
 * and asoc's bind address list.
 */
void sctp_v6_get_saddr(struct sctp_association *asoc, struct dst_entry *dst,
                       union sctp_addr *daddr, union sctp_addr *saddr)
{
        struct sctp_bind_addr *bp;
        rwlock_t *addr_lock;
        struct sctp_sockaddr_entry *laddr;
        struct list_head *pos;
        sctp_scope_t scope;
        union sctp_addr *baddr = NULL;
        __u8 matchlen = 0;
        __u8 bmatchlen;
 
        SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
                          "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
                          __FUNCTION__, asoc, dst, NIP6(&daddr->v6.sin6_addr));
 
        if (!asoc) {
                ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
                SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
                                  "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
                                  NIP6(&saddr->v6.sin6_addr));
                return;
        }
 
        scope = sctp_scope(daddr);
 
        bp = &asoc->base.bind_addr;
        addr_lock = &asoc->base.addr_lock;
 
        /* Go through the bind address list and find the best source address
         * that matches the scope of the destination address.
         */
        sctp_read_lock(addr_lock);
        list_for_each(pos, &bp->address_list) {
                laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
                if ((laddr->a.sa.sa_family == AF_INET6) &&
                    (scope <= sctp_scope(&laddr->a))) {
                        bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
                        if (!baddr || (matchlen < bmatchlen)) {
                                baddr = &laddr->a;
                                matchlen = bmatchlen;
                        }
                }
        }
 
        if (baddr) {
                memcpy(saddr, baddr, sizeof(union sctp_addr));
                SCTP_DEBUG_PRINTK("saddr: "
                                  "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
                                  NIP6(&saddr->v6.sin6_addr));
        } else {
                printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
                       "address for the "
                       "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
                       __FUNCTION__, asoc, NIP6(&daddr->v6.sin6_addr));
        }
 
        sctp_read_unlock(addr_lock);
}
 
/* Make a copy of all potential local addresses. */
static void sctp_v6_copy_addrlist(struct list_head *addrlist,
                                  struct net_device *dev)
{
        struct inet6_dev *in6_dev;
        struct inet6_ifaddr *ifp;
        struct sctp_sockaddr_entry *addr;
 
        read_lock(&addrconf_lock);
        if ((in6_dev = __in6_dev_get(dev)) == NULL) {
                read_unlock(&addrconf_lock);
                return;
        }
 
        read_lock(&in6_dev->lock);
        for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
                /* Add the address to the local list.  */
                addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
                if (addr) {
                        addr->a.v6.sin6_family = AF_INET6;
                        addr->a.v6.sin6_port = 0;
                        addr->a.v6.sin6_addr = ifp->addr;
                        addr->a.v6.sin6_scope_id = dev->ifindex;
                        INIT_LIST_HEAD(&addr->list);
                        list_add_tail(&addr->list, addrlist);
                }
        }
 
        read_unlock(&in6_dev->lock);
        read_unlock(&addrconf_lock);
}
 
/* Initialize a sockaddr_storage from in incoming skb. */
static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
                             int is_saddr)
{
        void *from;
        __u16 *port;
        struct sctphdr *sh;
 
        port = &addr->v6.sin6_port;
        addr->v6.sin6_family = AF_INET6;
        addr->v6.sin6_flowinfo = 0; /* FIXME */
        addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
 
        sh = (struct sctphdr *) skb->h.raw;
        if (is_saddr) {
                *port  = ntohs(sh->source);
                from = &skb->nh.ipv6h->saddr;
        } else {
                *port = ntohs(sh->dest);
                from = &skb->nh.ipv6h->daddr;
        }
        ipv6_addr_copy(&addr->v6.sin6_addr, from);
}
 
/* Initialize an sctp_addr from a socket. */
static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
{
        addr->v6.sin6_family = AF_INET6;
        addr->v6.sin6_port = sk->num;
        addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
}
 
/* Initialize sk->sk_rcv_saddr from sctp_addr. */
static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
{
        if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
                inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
                inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
                inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
                inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
                        addr->v4.sin_addr.s_addr;
        } else {
                inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
        }
}
 
/* Initialize sk->sk_daddr from sctp_addr. */
static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
{
        if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
                inet6_sk(sk)->daddr.s6_addr32[0] = 0;
                inet6_sk(sk)->daddr.s6_addr32[1] = 0;
                inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
                inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
        } else {
                inet6_sk(sk)->daddr = addr->v6.sin6_addr;
        }
}
 
/* Initialize a sctp_addr from an address parameter. */
static void sctp_v6_from_addr_param(union sctp_addr *addr,
                                    union sctp_addr_param *param,
                                    __u16 port, int iif)
{
        addr->v6.sin6_family = AF_INET6;
        addr->v6.sin6_port = port;
        addr->v6.sin6_flowinfo = 0; /* BUG */
        ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
        addr->v6.sin6_scope_id = iif;
}
 
/* Initialize an address parameter from a sctp_addr and return the length
 * of the address parameter.
 */
static int sctp_v6_to_addr_param(const union sctp_addr *addr,
                                 union sctp_addr_param *param)
{
        int length = sizeof(sctp_ipv6addr_param_t);
 
        param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
        param->v6.param_hdr.length = ntohs(length);
        ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
 
        return length;
}
 
/* Initialize a sctp_addr from a dst_entry. */
static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
                              unsigned short port)
{
        struct rt6_info *rt = (struct rt6_info *)dst;
        addr->sa.sa_family = AF_INET6;
        addr->v6.sin6_port = port;
        ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
}
 
/* Compare addresses exactly.
 * v4-mapped-v6 is also in consideration.
 */
static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
                            const union sctp_addr *addr2)
{
        if (addr1->sa.sa_family != addr2->sa.sa_family) {
                if (addr1->sa.sa_family == AF_INET &&
                    addr2->sa.sa_family == AF_INET6 &&
                    IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
                        if (addr2->v6.sin6_port == addr1->v4.sin_port &&
                            addr2->v6.sin6_addr.s6_addr32[3] ==
                            addr1->v4.sin_addr.s_addr)
                                return 1;
                }
                if (addr2->sa.sa_family == AF_INET &&
                    addr1->sa.sa_family == AF_INET6 &&
                    IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
                        if (addr1->v6.sin6_port == addr2->v4.sin_port &&
                            addr1->v6.sin6_addr.s6_addr32[3] ==
                            addr2->v4.sin_addr.s_addr)
                                return 1;
                }
                return 0;
        }
        if (ipv6_addr_cmp(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
                return 0;
        /* If this is a linklocal address, compare the scope_id. */
        if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
                if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
                    (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
                        return 0;
                }
        }
 
        return 1;
}
 
/* Initialize addr struct to INADDR_ANY. */
static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
{
        memset(addr, 0x00, sizeof(union sctp_addr));
        addr->v6.sin6_family = AF_INET6;
        addr->v6.sin6_port = port;
}
 
/* Is this a wildcard address? */
static int sctp_v6_is_any(const union sctp_addr *addr)
{
        int type;
        type = ipv6_addr_type((struct in6_addr *)&addr->v6.sin6_addr);
        return IPV6_ADDR_ANY == type;
}
 
/* Should this be available for binding?   */
static int sctp_v6_available(union sctp_addr *addr, struct sctp_opt *sp)
{
        int type;
        struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
 
        type = ipv6_addr_type(in6);
        if (IPV6_ADDR_ANY == type)
                return 1;
        if (type == IPV6_ADDR_MAPPED) {
                if (sp && !sp->v4mapped)
                        return 0;
                if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
                        return 0;
                sctp_v6_map_v4(addr);
                return sctp_get_af_specific(AF_INET)->available(addr, sp);
        }
        if (!(type & IPV6_ADDR_UNICAST))
                return 0;
 
        return ipv6_chk_addr(in6, NULL);
}
 
/* This function checks if the address is a valid address to be used for
 * SCTP.
 *
 * Output:
 * Return 0 - If the address is a non-unicast or an illegal address.
 * Return 1 - If the address is a unicast.
 */
static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_opt *sp)
{
        int ret = ipv6_addr_type(&addr->v6.sin6_addr);
 
        /* Support v4-mapped-v6 address. */
        if (ret == IPV6_ADDR_MAPPED) {
                /* Note: This routine is used in input, so v4-mapped-v6
                 * are disallowed here when there is no sctp_opt.
                 */
                if (!sp || !sp->v4mapped)
                        return 0;
                if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
                        return 0;
                sctp_v6_map_v4(addr);
                return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
        }
 
        /* Is this a non-unicast address */
        if (!(ret & IPV6_ADDR_UNICAST))
                return 0;
 
        return 1;
}
 
/* What is the scope of 'addr'?  */
static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
{
        int v6scope;
        sctp_scope_t retval;
 
        /* The IPv6 scope is really a set of bit fields.
         * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
         */
 
        v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
        switch (v6scope) {
        case IFA_HOST:
                retval = SCTP_SCOPE_LOOPBACK;
                break;
        case IFA_LINK:
                retval = SCTP_SCOPE_LINK;
                break;
        case IFA_SITE:
                retval = SCTP_SCOPE_PRIVATE;
                break;
        default:
                retval = SCTP_SCOPE_GLOBAL;
                break;
        };
 
        return retval;
}
 
/* Create and initialize a new sk for the socket to be returned by accept(). */
struct sock *sctp_v6_create_accept_sk(struct sock *sk,
                                      struct sctp_association *asoc)
{
        struct sock *newsk;
        struct inet_opt *newinet;
        struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 
        newsk = sk_alloc(PF_INET6, GFP_KERNEL, sizeof(struct sock));
        if (!newsk)
                goto out;
 
        sock_init_data(NULL, newsk);
        sk_set_owner(newsk, THIS_MODULE);
 
        newsk->sk_type = SOCK_STREAM;
 
        newsk->sk_prot = sk->sk_prot;
        newsk->sk_no_check = sk->sk_no_check;
        newsk->sk_reuse = sk->sk_reuse;
 
        newsk->sk_destruct = inet_sock_destruct;
        newsk->sk_zapped = 0;
        newsk->sk_family = PF_INET6;
        newsk->sk_protocol = IPPROTO_SCTP;
        newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
        newsk->sk_shutdown = sk->sk_shutdown;
 
        newinet = inet_sk(newsk);
        newnp = inet6_sk(newsk);
 
        memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 
        /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
         * and getpeername().
         */
        newsk->sport = sk->sport;
        newsk->saddr = sk->saddr;
        newnp->rcv_saddr = np->rcv_saddr;
        newsk->dport = htons(asoc->peer.port);
        sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
 
        /* Init the ipv4 part of the socket since we can have sockets
         * using v6 API for ipv4.
         */
        newinet->ttl = sysctl_ip_default_ttl;
        newinet->mc_loop = 1;
        newinet->mc_ttl = 1;
        newinet->mc_index = 0;
        newinet->mc_list = NULL;
 
        if (ipv4_config.no_pmtu_disc)
                newinet->pmtudisc = IP_PMTUDISC_DONT;
        else
                newinet->pmtudisc = IP_PMTUDISC_WANT;
 
#ifdef INET_REFCNT_DEBUG
        atomic_inc(&inet6_sock_nr);
        atomic_inc(&inet_sock_nr);
#endif
 
        if (newsk->sk_prot->init(newsk)) {
                inet_sock_release(newsk);
                newsk = NULL;
        }
 
out:
        return newsk;
}
 
/* Map v4 address to mapped v6 address */
static void sctp_v6_addr_v4map(struct sctp_opt *sp, union sctp_addr *addr)
{
        if (sp->v4mapped && AF_INET == addr->sa.sa_family)
                sctp_v4_map_v6(addr);
}
 
/* Where did this skb come from?  */
static int sctp_v6_skb_iif(const struct sk_buff *skb)
{
        struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
        return opt->iif;
}
 
/* Was this packet marked by Explicit Congestion Notification? */
static int sctp_v6_is_ce(const struct sk_buff *skb)
{
        return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
}
 
/* Dump the v6 addr to the seq file. */
static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
{
        seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
                   NIP6(&addr->v6.sin6_addr));
}
 
/* Initialize a PF_INET6 socket msg_name. */
static void sctp_inet6_msgname(char *msgname, int *addr_len)
{
        struct sockaddr_in6 *sin6;
 
        sin6 = (struct sockaddr_in6 *)msgname;
        sin6->sin6_family = AF_INET6;
        sin6->sin6_flowinfo = 0;
        sin6->sin6_scope_id = 0; /*FIXME */
        *addr_len = sizeof(struct sockaddr_in6);
}
 
/* Initialize a PF_INET msgname from a ulpevent. */
static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
                                     char *msgname, int *addrlen)
{
        struct sockaddr_in6 *sin6, *sin6from;
 
        if (msgname) {
                union sctp_addr *addr;
                struct sctp_association *asoc;
 
                asoc = event->sndrcvinfo.sinfo_assoc_id;
                sctp_inet6_msgname(msgname, addrlen);
                sin6 = (struct sockaddr_in6 *)msgname;
                sin6->sin6_port = htons(asoc->peer.port);
                addr = &asoc->peer.primary_addr;
 
                /* Note: If we go to a common v6 format, this code
                 * will change.
                 */
 
                /* Map ipv4 address into v4-mapped-on-v6 address.  */
                if (sctp_sk(asoc->base.sk)->v4mapped &&
                    AF_INET == addr->sa.sa_family) {
                        sctp_v4_map_v6((union sctp_addr *)sin6);
                        sin6->sin6_addr.s6_addr32[3] =
                                addr->v4.sin_addr.s_addr;
                        return;
                }
 
                sin6from = &asoc->peer.primary_addr.v6;
                ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
                if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
                        sin6->sin6_scope_id = sin6from->sin6_scope_id;
        }
}
 
/* Initialize a msg_name from an inbound skb. */
static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
                                   int *addr_len)
{
        struct sctphdr *sh;
        struct sockaddr_in6 *sin6;
 
        if (msgname) {
                sctp_inet6_msgname(msgname, addr_len);
                sin6 = (struct sockaddr_in6 *)msgname;
                sh = (struct sctphdr *)skb->h.raw;
                sin6->sin6_port = sh->source;
 
                /* Map ipv4 address into v4-mapped-on-v6 address. */
                if (sctp_sk(skb->sk)->v4mapped &&
                    skb->nh.iph->version == 4) {
                        sctp_v4_map_v6((union sctp_addr *)sin6);
                        sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
                        return;
                }
 
                /* Otherwise, just copy the v6 address. */
                ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
                if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
                        struct sctp_ulpevent *ev = sctp_skb2event(skb);
                        sin6->sin6_scope_id = ev->iif;
                }
        }
}
 
/* Do we support this AF? */
static int sctp_inet6_af_supported(sa_family_t family, struct sctp_opt *sp)
{
        switch (family) {
        case AF_INET6:
                return 1;
        /* v4-mapped-v6 addresses */
        case AF_INET:
                if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
                        return 1;
        default:
                return 0;
        }
}
 
/* Address matching with wildcards allowed.  This extra level
 * of indirection lets us choose whether a PF_INET6 should
 * disallow any v4 addresses if we so choose.
 */
static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
                               const union sctp_addr *addr2,
                               struct sctp_opt *opt)
{
        struct sctp_af *af1, *af2;
 
        af1 = sctp_get_af_specific(addr1->sa.sa_family);
        af2 = sctp_get_af_specific(addr2->sa.sa_family);
 
        if (!af1 || !af2)
                return 0;
        /* Today, wildcard AF_INET/AF_INET6. */
        if (sctp_is_any(addr1) || sctp_is_any(addr2))
                return 1;
 
        if (addr1->sa.sa_family != addr2->sa.sa_family)
                return 0;
 
        return af1->cmp_addr(addr1, addr2);
}
 
/* Verify that the provided sockaddr looks bindable.   Common verification,
 * has already been taken care of.
 */
static int sctp_inet6_bind_verify(struct sctp_opt *opt, union sctp_addr *addr)
{
        struct sctp_af *af;
 
        /* ASSERT: address family has already been verified. */
        if (addr->sa.sa_family != AF_INET6)
                af = sctp_get_af_specific(addr->sa.sa_family);
        else {
                struct sock *sk;
                int type = ipv6_addr_type(&addr->v6.sin6_addr);
                sk = sctp_opt2sk(opt);
                if (type & IPV6_ADDR_LINKLOCAL) {
                        /* Note: Behavior similar to af_inet6.c:
                         *  1) Overrides previous bound_dev_if
                         *  2) Destructive even if bind isn't successful.
                         */
 
                        if (addr->v6.sin6_scope_id)
                                sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
                        if (!sk->sk_bound_dev_if)
                                return 0;
                }
                af = opt->pf->af;
        }
        return af->available(addr, opt);
}
 
/* Verify that the provided sockaddr looks bindable.   Common verification,
 * has already been taken care of.
 */
static int sctp_inet6_send_verify(struct sctp_opt *opt, union sctp_addr *addr)
{
        struct sctp_af *af = NULL;
 
        /* ASSERT: address family has already been verified. */
        if (addr->sa.sa_family != AF_INET6)
                af = sctp_get_af_specific(addr->sa.sa_family);
        else {
                struct sock *sk;
                int type = ipv6_addr_type(&addr->v6.sin6_addr);
                sk = sctp_opt2sk(opt);
                if (type & IPV6_ADDR_LINKLOCAL) {
                        /* Note: Behavior similar to af_inet6.c:
                         *  1) Overrides previous bound_dev_if
                         *  2) Destructive even if bind isn't successful.
                         */
 
                        if (addr->v6.sin6_scope_id)
                                sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
                        if (!sk->sk_bound_dev_if)
                                return 0;
                }
                af = opt->pf->af;
        }
 
        return af != NULL;
}
 
/* Fill in Supported Address Type information for INIT and INIT-ACK
 * chunks.   Note: In the future, we may want to look at sock options
 * to determine whether a PF_INET6 socket really wants to have IPV4
 * addresses.
 * Returns number of addresses supported.
 */
static int sctp_inet6_supported_addrs(const struct sctp_opt *opt,
                                      __u16 *types)
{
        types[0] = SCTP_PARAM_IPV4_ADDRESS;
        types[1] = SCTP_PARAM_IPV6_ADDRESS;
        return 2;
}
 
static struct proto_ops inet6_seqpacket_ops = {
        .family     = PF_INET6,
        .release    = inet6_release,
        .bind       = inet6_bind,
        .connect    = inet_dgram_connect,
        .socketpair = sock_no_socketpair,
        .accept     = inet_accept,
        .getname    = inet6_getname,
        .poll       = sctp_poll,
        .ioctl      = inet6_ioctl,
        .listen     = sctp_inet_listen,
        .shutdown   = inet_shutdown,
        .setsockopt = inet_setsockopt,
        .getsockopt = inet_getsockopt,
        .sendmsg    = inet_sendmsg,
        .recvmsg    = inet_recvmsg,
        .mmap       = sock_no_mmap,
};
 
static struct inet_protosw sctpv6_seqpacket_protosw = {
        .type          = SOCK_SEQPACKET,
        .protocol      = IPPROTO_SCTP,
        .prot          = &sctp_prot,
        .ops           = &inet6_seqpacket_ops,
        .capability    = -1,
        .no_check      = 0,
        .flags         = SCTP_PROTOSW_FLAG
};
static struct inet_protosw sctpv6_stream_protosw = {
        .type          = SOCK_STREAM,
        .protocol      = IPPROTO_SCTP,
        .prot          = &sctp_prot,
        .ops           = &inet6_seqpacket_ops,
        .capability    = -1,
        .no_check      = 0,
        .flags         = SCTP_PROTOSW_FLAG,
};
 
static struct inet6_protocol sctpv6_protocol = {
        .handler      = sctp_rcv,
        .err_handler  = sctp_v6_err,
        .next         = NULL,
        .protocol     = IPPROTO_SCTP,
        .copy         = 0,
        .data         = NULL,
        .name         = "SCTPv6",
};
 
static struct sctp_af sctp_ipv6_specific = {
        .sctp_xmit       = sctp_v6_xmit,
        .setsockopt      = ipv6_setsockopt,
        .getsockopt      = ipv6_getsockopt,
        .get_dst         = sctp_v6_get_dst,
        .get_saddr       = sctp_v6_get_saddr,
        .copy_addrlist   = sctp_v6_copy_addrlist,
        .from_skb        = sctp_v6_from_skb,
        .from_sk         = sctp_v6_from_sk,
        .to_sk_saddr     = sctp_v6_to_sk_saddr,
        .to_sk_daddr     = sctp_v6_to_sk_daddr,
        .from_addr_param = sctp_v6_from_addr_param,
        .to_addr_param   = sctp_v6_to_addr_param,
        .dst_saddr       = sctp_v6_dst_saddr,
        .cmp_addr        = sctp_v6_cmp_addr,
        .scope           = sctp_v6_scope,
        .addr_valid      = sctp_v6_addr_valid,
        .inaddr_any      = sctp_v6_inaddr_any,
        .is_any          = sctp_v6_is_any,
        .available       = sctp_v6_available,
        .skb_iif         = sctp_v6_skb_iif,
        .is_ce           = sctp_v6_is_ce,
        .seq_dump_addr   = sctp_v6_seq_dump_addr,
        .net_header_len  = sizeof(struct ipv6hdr),
        .sockaddr_len    = sizeof(struct sockaddr_in6),
        .sa_family       = AF_INET6,
};
 
static struct sctp_pf sctp_pf_inet6_specific = {
        .event_msgname = sctp_inet6_event_msgname,
        .skb_msgname   = sctp_inet6_skb_msgname,
        .af_supported  = sctp_inet6_af_supported,
        .cmp_addr      = sctp_inet6_cmp_addr,
        .bind_verify   = sctp_inet6_bind_verify,
        .send_verify   = sctp_inet6_send_verify,
        .supported_addrs = sctp_inet6_supported_addrs,
        .create_accept_sk = sctp_v6_create_accept_sk,
        .addr_v4map    = sctp_v6_addr_v4map,
        .af            = &sctp_ipv6_specific,
};
 
/* Initialize IPv6 support and register with inet6 stack.  */
int sctp_v6_init(void)
{
        /* Register inet6 protocol. */
        inet6_add_protocol(&sctpv6_protocol);
 
        /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
        inet6_register_protosw(&sctpv6_seqpacket_protosw);
        inet6_register_protosw(&sctpv6_stream_protosw);
 
        /* Register the SCTP specific PF_INET6 functions. */
        sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
 
        /* Register the SCTP specific AF_INET6 functions. */
        sctp_register_af(&sctp_ipv6_specific);
 
        /* Register notifier for inet6 address additions/deletions. */
        register_inet6addr_notifier(&sctp_inetaddr_notifier);
 
        return 0;
}
 
/* IPv6 specific exit support. */
void sctp_v6_exit(void)
{
        list_del(&sctp_ipv6_specific.list);
        inet6_del_protocol(&sctpv6_protocol);
        inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
        inet6_unregister_protosw(&sctpv6_stream_protosw);
        unregister_inet6addr_notifier(&sctp_inetaddr_notifier);
}
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [sctp/] [ipv6.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/* SCTP kernel reference Implementation`
2			`* Copyright (c) 2001 Nokia, Inc.`
3			`* Copyright (c) 2001 La Monte H.P. Yarroll`
4			`* Copyright (c) 2002-2003 International Business Machines, Corp.`
5			`* Copyright (c) 2002-2003 Intel Corp.`
6			`*`
7			`* This file is part of the SCTP kernel reference Implementation`
8			`*`
9			`* SCTP over IPv6.`
10			`*`
11			`* The SCTP reference implementation is free software;`
12			`* you can redistribute it and/or modify it under the terms of`
13			`* the GNU General Public License as published by`
14			`* the Free Software Foundation; either version 2, or (at your option)`
15			`* any later version.`
16			`*`
17			`* The SCTP reference implementation is distributed in the hope that it`
18			`* will be useful, but WITHOUT ANY WARRANTY; without even the implied`
19			`* ************************`
20			`* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.`
21			`* See the GNU General Public License for more details.`
22			`*`
23			`* You should have received a copy of the GNU General Public License`
24			`* along with GNU CC; see the file COPYING. If not, write to`
25			`* the Free Software Foundation, 59 Temple Place - Suite 330,`
26			`* Boston, MA 02111-1307, USA.`
27			`*`
28			`* Please send any bug reports or fixes you make to the`
29			`* email address(es):`
30			`* lksctp developers <lksctp-developers@lists.sourceforge.net>`
31			`*`
32			`* Or submit a bug report through the following website:`
33			`* http://www.sf.net/projects/lksctp`
34			`*`
35			`* Written or modified by:`
36			`* Le Yanqun <yanqun.le@nokia.com>`
37			`* Hui Huang <hui.huang@nokia.com>`
38			`* La Monte H.P. Yarroll <piggy@acm.org>`
39			`* Sridhar Samudrala <sri@us.ibm.com>`
40			`* Jon Grimm <jgrimm@us.ibm.com>`