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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [ipv6/] [datagram.c] - Blame information for rev 1765

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/*
 *      common UDP/RAW code
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *
 *      $Id: datagram.c,v 1.1.1.1 2004-04-15 01:14:46 phoenix Exp $
 *
 *      This program 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 of the License, or (at your option) any later version.
 */
 
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/route.h>
 
#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/transp_v6.h>
 
#include <linux/errqueue.h>
#include <asm/uaccess.h>
 
void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
                     u16 port, u32 info, u8 *payload)
{
        struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
        struct sock_exterr_skb *serr;
 
        if (!sk->net_pinfo.af_inet6.recverr)
                return;
 
        skb = skb_clone(skb, GFP_ATOMIC);
        if (!skb)
                return;
 
        serr = SKB_EXT_ERR(skb);
        serr->ee.ee_errno = err;
        serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
        serr->ee.ee_type = icmph->icmp6_type;
        serr->ee.ee_code = icmph->icmp6_code;
        serr->ee.ee_pad = 0;
        serr->ee.ee_info = info;
        serr->ee.ee_data = 0;
        serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
        serr->port = port;
 
        skb->h.raw = payload;
        __skb_pull(skb, payload - skb->data);
 
        if (sock_queue_err_skb(sk, skb))
                kfree_skb(skb);
}
 
void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
{
        struct sock_exterr_skb *serr;
        struct ipv6hdr *iph;
        struct sk_buff *skb;
 
        if (!sk->net_pinfo.af_inet6.recverr)
                return;
 
        skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
        if (!skb)
                return;
 
        iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
        skb->nh.ipv6h = iph;
        memcpy(&iph->daddr, fl->fl6_dst, 16);
 
        serr = SKB_EXT_ERR(skb);
        serr->ee.ee_errno = err;
        serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
        serr->ee.ee_type = 0;
        serr->ee.ee_code = 0;
        serr->ee.ee_pad = 0;
        serr->ee.ee_info = info;
        serr->ee.ee_data = 0;
        serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
        serr->port = fl->uli_u.ports.dport;
 
        skb->h.raw = skb->tail;
        __skb_pull(skb, skb->tail - skb->data);
 
        if (sock_queue_err_skb(sk, skb))
                kfree_skb(skb);
}
 
/*
 *      Handle MSG_ERRQUEUE
 */
int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
{
        struct sock_exterr_skb *serr;
        struct sk_buff *skb, *skb2;
        struct sockaddr_in6 *sin;
        struct {
                struct sock_extended_err ee;
                struct sockaddr_in6      offender;
        } errhdr;
        int err;
        int copied;
 
        err = -EAGAIN;
        skb = skb_dequeue(&sk->error_queue);
        if (skb == NULL)
                goto out;
 
        copied = skb->len;
        if (copied > len) {
                msg->msg_flags |= MSG_TRUNC;
                copied = len;
        }
        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
        if (err)
                goto out_free_skb;
 
        sock_recv_timestamp(msg, sk, skb);
 
        serr = SKB_EXT_ERR(skb);
 
        sin = (struct sockaddr_in6 *)msg->msg_name;
        if (sin) {
                sin->sin6_family = AF_INET6;
                sin->sin6_flowinfo = 0;
                sin->sin6_port = serr->port;
                sin->sin6_scope_id = 0;
                if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
                        memcpy(&sin->sin6_addr, skb->nh.raw + serr->addr_offset, 16);
                        if (sk->net_pinfo.af_inet6.sndflow)
                                sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
                        if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
                                struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
                                sin->sin6_scope_id = opt->iif;
                        }
                } else {
                        ipv6_addr_set(&sin->sin6_addr, 0, 0,
                                      htonl(0xffff),
                                      *(u32*)(skb->nh.raw + serr->addr_offset));
                }
        }
 
        memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
        sin = &errhdr.offender;
        sin->sin6_family = AF_UNSPEC;
        if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
                sin->sin6_family = AF_INET6;
                sin->sin6_flowinfo = 0;
                sin->sin6_scope_id = 0;
                if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
                        memcpy(&sin->sin6_addr, &skb->nh.ipv6h->saddr, 16);
                        if (sk->net_pinfo.af_inet6.rxopt.all)
                                datagram_recv_ctl(sk, msg, skb);
                        if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
                                struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
                                sin->sin6_scope_id = opt->iif;
                        }
                } else {
                        ipv6_addr_set(&sin->sin6_addr, 0, 0,
                                      htonl(0xffff),
                                      skb->nh.iph->saddr);
                        if (sk->protinfo.af_inet.cmsg_flags)
                                ip_cmsg_recv(msg, skb);
                }
        }
 
        put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
 
        /* Now we could try to dump offended packet options */
 
        msg->msg_flags |= MSG_ERRQUEUE;
        err = copied;
 
        /* Reset and regenerate socket error */
        spin_lock_irq(&sk->error_queue.lock);
        sk->err = 0;
        if ((skb2 = skb_peek(&sk->error_queue)) != NULL) {
                sk->err = SKB_EXT_ERR(skb2)->ee.ee_errno;
                spin_unlock_irq(&sk->error_queue.lock);
                sk->error_report(sk);
        } else {
                spin_unlock_irq(&sk->error_queue.lock);
        }
 
out_free_skb:
        kfree_skb(skb);
out:
        return err;
}
 
 
 
int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
{
        struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
        struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
 
        if (np->rxopt.bits.rxinfo) {
                struct in6_pktinfo src_info;
 
                src_info.ipi6_ifindex = opt->iif;
                ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
                put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
        }
 
        if (np->rxopt.bits.rxhlim) {
                int hlim = skb->nh.ipv6h->hop_limit;
                put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
        }
 
        if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
                u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
                put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
        }
        if (np->rxopt.bits.hopopts && opt->hop) {
                u8 *ptr = skb->nh.raw + opt->hop;
                put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
        }
        if (np->rxopt.bits.dstopts && opt->dst0) {
                u8 *ptr = skb->nh.raw + opt->dst0;
                put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
        }
        if (np->rxopt.bits.srcrt && opt->srcrt) {
                struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
                put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
        }
        if (np->rxopt.bits.authhdr && opt->auth) {
                u8 *ptr = skb->nh.raw + opt->auth;
                put_cmsg(msg, SOL_IPV6, IPV6_AUTHHDR, (ptr[1]+1)<<2, ptr);
        }
        if (np->rxopt.bits.dstopts && opt->dst1) {
                u8 *ptr = skb->nh.raw + opt->dst1;
                put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
        }
        return 0;
}
 
int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
                      struct ipv6_txoptions *opt,
                      int *hlimit)
{
        struct in6_pktinfo *src_info;
        struct cmsghdr *cmsg;
        struct ipv6_rt_hdr *rthdr;
        struct ipv6_opt_hdr *hdr;
        int len;
        int err = 0;
 
        for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 
                if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
                    (unsigned long)(((char*)cmsg - (char*)msg->msg_control)
                                    + cmsg->cmsg_len) > msg->msg_controllen) {
                        err = -EINVAL;
                        goto exit_f;
                }
 
                if (cmsg->cmsg_level != SOL_IPV6)
                        continue;
 
                switch (cmsg->cmsg_type) {
                case IPV6_PKTINFO:
                        if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
 
                        if (src_info->ipi6_ifindex) {
                                if (fl->oif && src_info->ipi6_ifindex != fl->oif)
                                        return -EINVAL;
                                fl->oif = src_info->ipi6_ifindex;
                        }
 
                        if (!ipv6_addr_any(&src_info->ipi6_addr)) {
                                if (!ipv6_chk_addr(&src_info->ipi6_addr, NULL)) {
                                        err = -EINVAL;
                                        goto exit_f;
                                }
 
                                fl->fl6_src = &src_info->ipi6_addr;
                        }
 
                        break;
 
                case IPV6_FLOWINFO:
                        if (cmsg->cmsg_len < CMSG_LEN(4)) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
                                if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
                                        err = -EINVAL;
                                        goto exit_f;
                                }
                        }
                        fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
                        break;
 
                case IPV6_HOPOPTS:
                        if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
                        len = ((hdr->hdrlen + 1) << 3);
                        if (cmsg->cmsg_len < CMSG_LEN(len)) {
                                err = -EINVAL;
                                goto exit_f;
                        }
                        if (!capable(CAP_NET_RAW)) {
                                err = -EPERM;
                                goto exit_f;
                        }
                        opt->opt_nflen += len;
                        opt->hopopt = hdr;
                        break;
 
                case IPV6_DSTOPTS:
                        if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
                        len = ((hdr->hdrlen + 1) << 3);
                        if (cmsg->cmsg_len < CMSG_LEN(len)) {
                                err = -EINVAL;
                                goto exit_f;
                        }
                        if (!capable(CAP_NET_RAW)) {
                                err = -EPERM;
                                goto exit_f;
                        }
                        if (opt->dst1opt) {
                                err = -EINVAL;
                                goto exit_f;
                        }
                        opt->opt_flen += len;
                        opt->dst1opt = hdr;
                        break;
 
                case IPV6_AUTHHDR:
                        if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
                        len = ((hdr->hdrlen + 2) << 2);
                        if (cmsg->cmsg_len < CMSG_LEN(len)) {
                                err = -EINVAL;
                                goto exit_f;
                        }
                        if (len & ~7) {
                                err = -EINVAL;
                                goto exit_f;
                        }
                        opt->opt_flen += len;
                        opt->auth = hdr;
                        break;
 
                case IPV6_RTHDR:
                        if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
 
                        /*
                         *      TYPE 0
                         */
                        if (rthdr->type) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        len = ((rthdr->hdrlen + 1) << 3);
 
                        if (cmsg->cmsg_len < CMSG_LEN(len)) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        /* segments left must also match */
                        if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        opt->opt_nflen += len;
                        opt->srcrt = rthdr;
 
                        if (opt->dst1opt) {
                                int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
 
                                opt->opt_nflen += dsthdrlen;
                                opt->dst0opt = opt->dst1opt;
                                opt->dst1opt = NULL;
                                opt->opt_flen -= dsthdrlen;
                        }
 
                        break;
 
                case IPV6_HOPLIMIT:
                        if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
                                err = -EINVAL;
                                goto exit_f;
                        }
 
                        *hlimit = *(int *)CMSG_DATA(cmsg);
                        break;
 
                default:
                        if (net_ratelimit())
                                printk(KERN_DEBUG "invalid cmsg type: %d\n", cmsg->cmsg_type);
                        err = -EINVAL;
                        break;
                };
        }
 
exit_f:
        return err;
}

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [ipv6/] [datagram.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* common UDP/RAW code`
3			`* Linux INET6 implementation`
4			`*`
5			`* Authors:`
6			`* Pedro Roque <roque@di.fc.ul.pt>`
7			`*`
8			`* $Id: datagram.c,v 1.1.1.1 2004-04-15 01:14:46 phoenix Exp $`
9			`*`
10			`* This program is free software; you can redistribute it and/or`
11			`* modify it under the terms of the GNU General Public License`
12			`* as published by the Free Software Foundation; either version`
13			`* 2 of the License, or (at your option) any later version.`
14			`*/`
15
16			`#include <linux/errno.h>`
17			`#include <linux/types.h>`
18			`#include <linux/kernel.h>`
19			`#include <linux/sched.h>`
20			`#include <linux/interrupt.h>`
21			`#include <linux/socket.h>`
22			`#include <linux/sockios.h>`
23			`#include <linux/in6.h>`
24			`#include <linux/ipv6.h>`
25			`#include <linux/route.h>`
26
27			`#include <net/ipv6.h>`
28			`#include <net/ndisc.h>`
29			`#include <net/addrconf.h>`
30			`#include <net/transp_v6.h>`
31
32			`#include <linux/errqueue.h>`
33			`#include <asm/uaccess.h>`
34
35			`void ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,`
36			`u16 port, u32 info, u8 *payload)`
37			`{`
38			`struct icmp6hdr icmph = (struct icmp6hdr )skb->h.raw;`
39			`struct sock_exterr_skb *serr;`
40
41			`if (!sk->net_pinfo.af_inet6.recverr)`
42			`return;`
43
44			`skb = skb_clone(skb, GFP_ATOMIC);`
45			`if (!skb)`
46			`return;`
47
48			`serr = SKB_EXT_ERR(skb);`
49			`serr->ee.ee_errno = err;`
50			`serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;`
51			`serr->ee.ee_type = icmph->icmp6_type;`
52			`serr->ee.ee_code = icmph->icmp6_code;`
53			`serr->ee.ee_pad = 0;`
54			`serr->ee.ee_info = info;`
55			`serr->ee.ee_data = 0;`
56			`serr->addr_offset = (u8)&(((struct ipv6hdr)(icmph+1))->daddr) - skb->nh.raw;`
57			`serr->port = port;`
58
59			`skb->h.raw = payload;`
60			`__skb_pull(skb, payload - skb->data);`
61
62			`if (sock_queue_err_skb(sk, skb))`
63			`kfree_skb(skb);`
64			`}`
65
66			`void ipv6_local_error(struct sock sk, int err, struct flowi fl, u32 info)`
67			`{`
68			`struct sock_exterr_skb *serr;`
69			`struct ipv6hdr *iph;`
70			`struct sk_buff *skb;`
71
72			`if (!sk->net_pinfo.af_inet6.recverr)`
73			`return;`
74
75			`skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);`
76			`if (!skb)`
77			`return;`
78
79			`iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));`
80			`skb->nh.ipv6h = iph;`
81			`memcpy(&iph->daddr, fl->fl6_dst, 16);`
82
83			`serr = SKB_EXT_ERR(skb);`
84			`serr->ee.ee_errno = err;`
85			`serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;`
86			`serr->ee.ee_type = 0;`
87			`serr->ee.ee_code = 0;`
88			`serr->ee.ee_pad = 0;`
89			`serr->ee.ee_info = info;`
90			`serr->ee.ee_data = 0;`
91			`serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;`
92			`serr->port = fl->uli_u.ports.dport;`
93
94			`skb->h.raw = skb->tail;`
95			`__skb_pull(skb, skb->tail - skb->data);`
96
97			`if (sock_queue_err_skb(sk, skb))`
98			`kfree_skb(skb);`
99			`}`
100
101			`/*`
102			`* Handle MSG_ERRQUEUE`
103			`*/`
104			`int ipv6_recv_error(struct sock sk, struct msghdr msg, int len)`
105			`{`
106			`struct sock_exterr_skb *serr;`
107			`struct sk_buff skb, skb2;`
108			`struct sockaddr_in6 *sin;`
109			`struct {`
110			`struct sock_extended_err ee;`
111			`struct sockaddr_in6 offender;`
112			`} errhdr;`
113			`int err;`
114			`int copied;`
115
116			`err = -EAGAIN;`
117			`skb = skb_dequeue(&sk->error_queue);`
118			`if (skb == NULL)`
119			`goto out;`
120
121			`copied = skb->len;`
122			`if (copied > len) {`
123			`msg->msg_flags \|= MSG_TRUNC;`
124			`copied = len;`
125			`}`
126			`err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);`
127			`if (err)`
128			`goto out_free_skb;`
129
130			`sock_recv_timestamp(msg, sk, skb);`
131
132			`serr = SKB_EXT_ERR(skb);`
133
134			`sin = (struct sockaddr_in6 *)msg->msg_name;`
135			`if (sin) {`
136			`sin->sin6_family = AF_INET6;`
137			`sin->sin6_flowinfo = 0;`
138			`sin->sin6_port = serr->port;`
139			`sin->sin6_scope_id = 0;`
140			`if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {`
141			`memcpy(&sin->sin6_addr, skb->nh.raw + serr->addr_offset, 16);`
142			`if (sk->net_pinfo.af_inet6.sndflow)`
143			`sin->sin6_flowinfo = (u32)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;`
144			`if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) {`
145			`struct inet6_skb_parm opt = (struct inet6_skb_parm ) skb->cb;`
146			`sin->sin6_scope_id = opt->iif;`
147			`}`
148			`} else {`
149			`ipv6_addr_set(&sin->sin6_addr, 0, 0,`
150			`htonl(0xffff),`
151			`(u32)(skb->nh.raw + serr->addr_offset));`
152			`}`
153			`}`
154
155			`memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));`
156			`sin = &errhdr.offender;`
157			`sin->sin6_family = AF_UNSPEC;`
158			`if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {`
159			`sin->sin6_family = AF_INET6;`
160			`sin->sin6_flowinfo = 0;`
161			`sin->sin6_scope_id = 0;`
162			`if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {`
163			`memcpy(&sin->sin6_addr, &skb->nh.ipv6h->saddr, 16);`
164			`if (sk->net_pinfo.af_inet6.rxopt.all)`
165			`datagram_recv_ctl(sk, msg, skb);`
166			`if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) {`
167			`struct inet6_skb_parm opt = (struct inet6_skb_parm ) skb->cb;`
168			`sin->sin6_scope_id = opt->iif;`
169			`}`
170			`} else {`
171			`ipv6_addr_set(&sin->sin6_addr, 0, 0,`
172			`htonl(0xffff),`
173			`skb->nh.iph->saddr);`
174			`if (sk->protinfo.af_inet.cmsg_flags)`
175			`ip_cmsg_recv(msg, skb);`
176			`}`
177			`}`
178
179			`put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);`
180
181			`/* Now we could try to dump offended packet options */`
182
183			`msg->msg_flags \|= MSG_ERRQUEUE;`
184			`err = copied;`
185
186			`/* Reset and regenerate socket error */`
187			`spin_lock_irq(&sk->error_queue.lock);`
188			`sk->err = 0;`
189			`if ((skb2 = skb_peek(&sk->error_queue)) != NULL) {`
190			`sk->err = SKB_EXT_ERR(skb2)->ee.ee_errno;`
191			`spin_unlock_irq(&sk->error_queue.lock);`
192			`sk->error_report(sk);`
193			`} else {`
194			`spin_unlock_irq(&sk->error_queue.lock);`
195			`}`
196
197			`out_free_skb:`
198			`kfree_skb(skb);`
199			`out:`
200			`return err;`
201			`}`
202
203
204
205			`int datagram_recv_ctl(struct sock sk, struct msghdr msg, struct sk_buff *skb)`
206			`{`
207			`struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;`
208			`struct inet6_skb_parm opt = (struct inet6_skb_parm ) skb->cb;`
209
210			`if (np->rxopt.bits.rxinfo) {`
211			`struct in6_pktinfo src_info;`
212
213			`src_info.ipi6_ifindex = opt->iif;`
214			`ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);`
215			`put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);`
216			`}`
217
218			`if (np->rxopt.bits.rxhlim) {`
219			`int hlim = skb->nh.ipv6h->hop_limit;`
220			`put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);`
221			`}`
222
223			`if (np->rxopt.bits.rxflow && ((u32)skb->nh.raw & IPV6_FLOWINFO_MASK)) {`
224			`u32 flowinfo = (u32)skb->nh.raw & IPV6_FLOWINFO_MASK;`
225			`put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);`
226			`}`
227			`if (np->rxopt.bits.hopopts && opt->hop) {`
228			`u8 *ptr = skb->nh.raw + opt->hop;`
229			`put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);`
230			`}`
231			`if (np->rxopt.bits.dstopts && opt->dst0) {`
232			`u8 *ptr = skb->nh.raw + opt->dst0;`
233			`put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);`
234			`}`
235			`if (np->rxopt.bits.srcrt && opt->srcrt) {`
236			`struct ipv6_rt_hdr rthdr = (struct ipv6_rt_hdr )(skb->nh.raw + opt->srcrt);`
237			`put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr);`
238			`}`
239			`if (np->rxopt.bits.authhdr && opt->auth) {`
240			`u8 *ptr = skb->nh.raw + opt->auth;`
241			`put_cmsg(msg, SOL_IPV6, IPV6_AUTHHDR, (ptr[1]+1)<<2, ptr);`
242			`}`
243			`if (np->rxopt.bits.dstopts && opt->dst1) {`
244			`u8 *ptr = skb->nh.raw + opt->dst1;`
245			`put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);`
246			`}`
247			`return 0;`
248			`}`
249
250			`int datagram_send_ctl(struct msghdr msg, struct flowi fl,`
251			`struct ipv6_txoptions *opt,`
252			`int *hlimit)`
253			`{`
254			`struct in6_pktinfo *src_info;`
255			`struct cmsghdr *cmsg;`
256			`struct ipv6_rt_hdr *rthdr;`
257			`struct ipv6_opt_hdr *hdr;`
258			`int len;`
259			`int err = 0;`
260
261			`for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {`
262
263			`if (cmsg->cmsg_len < sizeof(struct cmsghdr) \|\|`
264			`(unsigned long)(((char)cmsg - (char)msg->msg_control)`
265			`+ cmsg->cmsg_len) > msg->msg_controllen) {`
266			`err = -EINVAL;`
267			`goto exit_f;`
268			`}`
269
270			`if (cmsg->cmsg_level != SOL_IPV6)`
271			`continue;`
272
273			`switch (cmsg->cmsg_type) {`
274			`case IPV6_PKTINFO:`
275			`if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {`
276			`err = -EINVAL;`
277			`goto exit_f;`
278			`}`
279
280			`src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);`
281
282			`if (src_info->ipi6_ifindex) {`
283			`if (fl->oif && src_info->ipi6_ifindex != fl->oif)`
284			`return -EINVAL;`
285			`fl->oif = src_info->ipi6_ifindex;`
286			`}`
287
288			`if (!ipv6_addr_any(&src_info->ipi6_addr)) {`
289			`if (!ipv6_chk_addr(&src_info->ipi6_addr, NULL)) {`
290			`err = -EINVAL;`
291			`goto exit_f;`
292			`}`
293
294			`fl->fl6_src = &src_info->ipi6_addr;`
295			`}`
296
297			`break;`
298
299			`case IPV6_FLOWINFO:`
300			`if (cmsg->cmsg_len < CMSG_LEN(4)) {`
301			`err = -EINVAL;`
302			`goto exit_f;`
303			`}`
304
305			`if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {`
306			`if ((fl->fl6_flowlabel^(u32 )CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {`
307			`err = -EINVAL;`
308			`goto exit_f;`
309			`}`
310			`}`
311			`fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & (u32 )CMSG_DATA(cmsg);`
312			`break;`
313
314			`case IPV6_HOPOPTS:`
315			`if (opt->hopopt \|\| cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {`
316			`err = -EINVAL;`
317			`goto exit_f;`
318			`}`
319
320			`hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);`
321			`len = ((hdr->hdrlen + 1) << 3);`
322			`if (cmsg->cmsg_len < CMSG_LEN(len)) {`
323			`err = -EINVAL;`
324			`goto exit_f;`
325			`}`
326			`if (!capable(CAP_NET_RAW)) {`
327			`err = -EPERM;`
328			`goto exit_f;`
329			`}`
330			`opt->opt_nflen += len;`
331			`opt->hopopt = hdr;`
332			`break;`
333
334			`case IPV6_DSTOPTS:`
335			`if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {`
336			`err = -EINVAL;`
337			`goto exit_f;`
338			`}`
339
340			`hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);`
341			`len = ((hdr->hdrlen + 1) << 3);`
342			`if (cmsg->cmsg_len < CMSG_LEN(len)) {`
343			`err = -EINVAL;`
344			`goto exit_f;`
345			`}`
346			`if (!capable(CAP_NET_RAW)) {`
347			`err = -EPERM;`
348			`goto exit_f;`
349			`}`
350			`if (opt->dst1opt) {`
351			`err = -EINVAL;`
352			`goto exit_f;`
353			`}`
354			`opt->opt_flen += len;`
355			`opt->dst1opt = hdr;`
356			`break;`
357
358			`case IPV6_AUTHHDR:`
359			`if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {`
360			`err = -EINVAL;`
361			`goto exit_f;`
362			`}`
363
364			`hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);`
365			`len = ((hdr->hdrlen + 2) << 2);`
366			`if (cmsg->cmsg_len < CMSG_LEN(len)) {`
367			`err = -EINVAL;`
368			`goto exit_f;`
369			`}`
370			`if (len & ~7) {`
371			`err = -EINVAL;`
372			`goto exit_f;`
373			`}`
374			`opt->opt_flen += len;`
375			`opt->auth = hdr;`
376			`break;`
377
378			`case IPV6_RTHDR:`
379			`if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {`
380			`err = -EINVAL;`
381			`goto exit_f;`
382			`}`
383
384			`rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);`
385
386			`/*`
387			`* TYPE 0`
388			`*/`
389			`if (rthdr->type) {`
390			`err = -EINVAL;`
391			`goto exit_f;`
392			`}`
393
394			`len = ((rthdr->hdrlen + 1) << 3);`
395
396			`if (cmsg->cmsg_len < CMSG_LEN(len)) {`
397			`err = -EINVAL;`
398			`goto exit_f;`
399			`}`
400
401			`/* segments left must also match */`
402			`if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {`
403			`err = -EINVAL;`
404			`goto exit_f;`
405			`}`
406
407			`opt->opt_nflen += len;`
408			`opt->srcrt = rthdr;`
409
410			`if (opt->dst1opt) {`
411			`int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);`
412
413			`opt->opt_nflen += dsthdrlen;`
414			`opt->dst0opt = opt->dst1opt;`
415			`opt->dst1opt = NULL;`
416			`opt->opt_flen -= dsthdrlen;`
417			`}`
418
419			`break;`
420
421			`case IPV6_HOPLIMIT:`
422			`if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {`
423			`err = -EINVAL;`
424			`goto exit_f;`
425			`}`
426
427			`hlimit = (int *)CMSG_DATA(cmsg);`
428			`break;`
429
430			`default:`
431			`if (net_ratelimit())`
432			`printk(KERN_DEBUG "invalid cmsg type: %d\n", cmsg->cmsg_type);`
433			`err = -EINVAL;`
434			`break;`
435			`};`
436			`}`
437
438			`exit_f:`
439			`return err;`
440			`}`