static __le16 *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
{
struct dn_scp *scp = DN_SK(sk);
unsigned short acknum = scp->numdat_rcv & 0x0FFF;
unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
__le16 *ptr;
BUG_ON(hlen < 9);
scp->ackxmt_dat = acknum;
scp->ackxmt_oth = ackcrs;
acknum |= 0x8000;
ackcrs |= 0x8000;
/* If this is an "other data/ack" message, swap acknum and ackcrs */
if (other) {
unsigned short tmp = acknum;
acknum = ackcrs;
ackcrs = tmp;
}
/* Set "cross subchannel" bit in ackcrs */
ackcrs |= 0x2000;
ptr = (__le16 *)dn_mk_common_header(scp, skb, msgflag, hlen);
*ptr++ = dn_htons(acknum);
*ptr++ = dn_htons(ackcrs);
return ptr;
}
void dn_send_conn_conf(struct sock *sk, gfp_t gfp)
{
struct dn_scp *scp = DN_SK(sk);
struct sk_buff *skb = NULL;
struct nsp_conn_init_msg *msg;
__u8 len = (__u8)dn_ntohs(scp->conndata_out.opt_optl);
if ((skb = dn_alloc_skb(sk, 50 + len, gfp)) == NULL)
return;
msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
msg->msgflg = 0x28;
msg->dstaddr = scp->addrrem;
msg->srcaddr = scp->addrloc;
msg->services = scp->services_loc;
msg->info = scp->info_loc;
msg->segsize = dn_htons(scp->segsize_loc);
*skb_put(skb,1) = len;
if (len > 0)
memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
dn_nsp_send(skb);
scp->persist = dn_nsp_persist(sk);
scp->persist_fxn = dn_nsp_retrans_conn_conf;
}
/*
* Endnode hello message received
*/
int dn_neigh_endnode_hello(struct sk_buff *skb)
{
struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
struct neighbour *neigh;
struct dn_neigh *dn;
dn_address src;
src = dn_htons(dn_eth2dn(msg->id));
neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
dn = (struct dn_neigh *)neigh;
if (neigh) {
write_lock(&neigh->lock);
neigh->used = jiffies;
if (!(neigh->nud_state & NUD_PERMANENT)) {
neigh->updated = jiffies;
if (neigh->dev->type == ARPHRD_ETHER)
memcpy(neigh->ha, &skb->mac.ethernet->h_source, ETH_ALEN);
dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
dn->blksize = dn_ntohs(msg->blksize);
dn->priority = 0;
}
write_unlock(&neigh->lock);
neigh_release(neigh);
}
kfree_skb(skb);
return 0;
}
/*
* Ethernet router hello message received
*/
int dn_neigh_router_hello(struct sk_buff *skb)
{
struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
struct neighbour *neigh;
struct dn_neigh *dn;
struct dn_dev *dn_db;
dn_address src;
src = dn_htons(dn_eth2dn(msg->id));
neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
dn = (struct dn_neigh *)neigh;
if (neigh) {
write_lock(&neigh->lock);
neigh->used = jiffies;
dn_db = (struct dn_dev *)neigh->dev->dn_ptr;
if (!(neigh->nud_state & NUD_PERMANENT)) {
neigh->updated = jiffies;
if (neigh->dev->type == ARPHRD_ETHER)
memcpy(neigh->ha, &skb->mac.ethernet->h_source, ETH_ALEN);
dn->blksize = dn_ntohs(msg->blksize);
dn->priority = msg->priority;
dn->flags &= ~DN_NDFLAG_P3;
switch(msg->iinfo & DN_RT_INFO_TYPE) {
case DN_RT_INFO_L1RT:
dn->flags &=~DN_NDFLAG_R2;
dn->flags |= DN_NDFLAG_R1;
break;
case DN_RT_INFO_L2RT:
dn->flags |= DN_NDFLAG_R2;
}
}
if (!dn_db->router) {
dn_db->router = neigh_clone(neigh);
} else {
if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
}
write_unlock(&neigh->lock);
neigh_release(neigh);
}
kfree_skb(skb);
return 0;
}
/*
* Phase 3 output is the same is short output, execpt that
* it clears the area bits before transmission.
*/
static int dn_phase3_output(struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
struct neighbour *neigh = dst->neighbour;
struct net_device *dev = neigh->dev;
int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
struct dn_short_packet *sp;
unsigned char *data;
struct dn_skb_cb *cb = DN_SKB_CB(skb);
if (skb_headroom(skb) < headroom) {
struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
if (skb2 == NULL) {
if (net_ratelimit())
printk(KERN_CRIT "dn_phase3_output: no memory\n");
kfree_skb(skb);
return -ENOBUFS;
}
kfree_skb(skb);
skb = skb2;
if (net_ratelimit())
printk(KERN_INFO "dn_phase3_output: Increasing headroom\n");
}
data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
*((unsigned short *)data) = dn_htons(skb->len - 2);
sp = (struct dn_short_packet *)(data + 2);
sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
sp->dstnode = cb->dst & dn_htons(0x03ff);
sp->srcnode = cb->src & dn_htons(0x03ff);
sp->forward = cb->hops & 0x3f;
skb->nh.raw = skb->data;
return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
}
static __le16 *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
{
struct dn_scp *scp = DN_SK(sk);
struct dn_skb_cb *cb = DN_SKB_CB(skb);
__le16 *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
if (unlikely(oth)) {
cb->segnum = scp->numoth;
seq_add(&scp->numoth, 1);
} else {
cb->segnum = scp->numdat;
seq_add(&scp->numdat, 1);
}
*(ptr++) = dn_htons(cb->segnum);
return ptr;
}
/*
* Simple routine to parse an ascii DECnet address
* into a network order address.
*/
static int parse_addr(dn_address *addr, char *str)
{
dn_address area, node;
while(*str && !ISNUM(*str)) str++;
if (*str == 0)
return -1;
area = (*str++ - '0');
if (ISNUM(*str)) {
area *= 10;
area += (*str++ - '0');
}
if (*str++ != '.')
return -1;
if (!ISNUM(*str))
return -1;
node = *str++ - '0';
if (ISNUM(*str)) {
node *= 10;
node += (*str++ - '0');
}
if (ISNUM(*str)) {
node *= 10;
node += (*str++ - '0');
}
if (ISNUM(*str)) {
node *= 10;
node += (*str++ - '0');
}
if ((node > 1023) || (area > 63))
return -1;
if (INVALID_END_CHAR(*str))
return -1;
*addr = dn_htons((area << 10) | node);
return 0;
}
static int dn_long_output(struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
struct neighbour *neigh = dst->neighbour;
struct net_device *dev = neigh->dev;
int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
unsigned char *data;
struct dn_long_packet *lp;
struct dn_skb_cb *cb = DN_SKB_CB(skb);
if (skb_headroom(skb) < headroom) {
struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
if (skb2 == NULL) {
if (net_ratelimit())
printk(KERN_CRIT "dn_long_output: no memory\n");
kfree_skb(skb);
return -ENOBUFS;
}
kfree_skb(skb);
skb = skb2;
if (net_ratelimit())
printk(KERN_INFO "dn_long_output: Increasing headroom\n");
}
data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
lp = (struct dn_long_packet *)(data+3);
*((unsigned short *)data) = dn_htons(skb->len - 2);
*(data + 2) = 1 | DN_RT_F_PF; /* Padding */
lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
lp->d_area = lp->d_subarea = 0;
dn_dn2eth(lp->d_id, dn_ntohs(cb->dst));
lp->s_area = lp->s_subarea = 0;
dn_dn2eth(lp->s_id, dn_ntohs(cb->src));
lp->nl2 = 0;
lp->visit_ct = cb->hops & 0x3f;
lp->s_class = 0;
lp->pt = 0;
skb->nh.raw = skb->data;
return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
}
static void dn_nsp_conn_conf(struct sock *sk, struct sk_buff *skb)
{
struct dn_skb_cb *cb = DN_SKB_CB(skb);
struct dn_scp *scp = DN_SK(sk);
unsigned char *ptr;
if (skb->len < 4)
goto out;
ptr = skb->data;
cb->services = *ptr++;
cb->info = *ptr++;
cb->segsize = dn_ntohs(*(__le16 *)ptr);
if ((scp->state == DN_CI) || (scp->state == DN_CD)) {
scp->persist = 0;
scp->addrrem = cb->src_port;
sk->sk_state = TCP_ESTABLISHED;
scp->state = DN_RUN;
scp->services_rem = cb->services;
scp->info_rem = cb->info;
scp->segsize_rem = cb->segsize;
if ((scp->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
scp->max_window = decnet_no_fc_max_cwnd;
if (skb->len > 0) {
u16 dlen = *skb->data;
if ((dlen <= 16) && (dlen <= skb->len)) {
scp->conndata_in.opt_optl = dn_htons(dlen);
skb_copy_from_linear_data_offset(skb, 1,
scp->conndata_in.opt_data, dlen);
}
}
dn_nsp_send_link(sk, DN_NOCHANGE, 0);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_state_change(sk);
}
out:
kfree_skb(skb);
}
static int dnet_pton1(const char *src, struct dn_naddr *dna) {
u_int16_t addr;
u_int16_t area = 0;
u_int16_t node = 0;
int pos;
pos = dnet_num(src, &area);
if ((pos == 0) || (area > 63) || (*(src + pos) != '.')) {
return 0;
}
pos = dnet_num(src + pos + 1, &node);
if ((pos == 0) || (node > 1023)) {
return 0;
}
dna->a_len = 2;
addr = dn_htons((area << 10) | node);
memcpy(dna->a_addr, &addr, sizeof(addr));
return 1;
}
static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
unsigned short reason, gfp_t gfp,
struct dst_entry *dst,
int ddl, unsigned char *dd, __le16 rem, __le16 loc)
{
struct sk_buff *skb = NULL;
int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
unsigned char *msg;
if ((dst == NULL) || (rem == 0)) {
if (net_ratelimit())
printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to [email protected] rem=%u dst=%p\n", dn_ntohs(rem), dst);
return;
}
if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
return;
msg = skb_put(skb, size);
*msg++ = msgflg;
*(__le16 *)msg = rem;
msg += 2;
*(__le16 *)msg = loc;
msg += 2;
*(__le16 *)msg = dn_htons(reason);
msg += 2;
if (msgflg == NSP_DISCINIT)
*msg++ = ddl;
if (ddl) {
memcpy(msg, dd, ddl);
}
/*
* This doesn't go via the dn_nsp_send() function since we need
* to be able to send disc packets out which have no socket
* associations.
*/
skb->dst = dst_clone(dst);
dst_output(skb);
}
static void dn_nsp_disc_init(struct sock *sk, struct sk_buff *skb)
{
struct dn_scp *scp = DN_SK(sk);
struct dn_skb_cb *cb = DN_SKB_CB(skb);
unsigned short reason;
if (skb->len < 2)
goto out;
reason = dn_ntohs(*(__le16 *)skb->data);
skb_pull(skb, 2);
scp->discdata_in.opt_status = dn_htons(reason);
scp->discdata_in.opt_optl = 0;
memset(scp->discdata_in.opt_data, 0, 16);
if (skb->len > 0) {
u16 dlen = *skb->data;
if ((dlen <= 16) && (dlen <= skb->len)) {
scp->discdata_in.opt_optl = dn_htons(dlen);
skb_copy_from_linear_data_offset(skb, 1, scp->discdata_in.opt_data, dlen);
}
}
scp->addrrem = cb->src_port;
sk->sk_state = TCP_CLOSE;
switch(scp->state) {
case DN_CI:
case DN_CD:
scp->state = DN_RJ;
sk->sk_err = ECONNREFUSED;
break;
case DN_RUN:
sk->sk_shutdown |= SHUTDOWN_MASK;
scp->state = DN_DN;
break;
case DN_DI:
scp->state = DN_DIC;
break;
}
if (!sock_flag(sk, SOCK_DEAD)) {
if (sk->sk_socket->state != SS_UNCONNECTED)
sk->sk_socket->state = SS_DISCONNECTING;
sk->sk_state_change(sk);
}
/*
* It appears that its possible for remote machines to send disc
* init messages with no port identifier if we are in the CI and
* possibly also the CD state. Obviously we shouldn't reply with
* a message if we don't know what the end point is.
*/
if (scp->addrrem) {
dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
}
scp->persist_fxn = dn_destroy_timer;
scp->persist = dn_nsp_persist(sk);
out:
kfree_skb(skb);
}
void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
{
struct dn_scp *scp = DN_SK(sk);
struct nsp_conn_init_msg *msg;
unsigned char aux;
unsigned char menuver;
struct dn_skb_cb *cb;
unsigned char type = 1;
gfp_t allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
if (!skb)
return;
cb = DN_SKB_CB(skb);
msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
msg->msgflg = msgflg;
msg->dstaddr = 0x0000; /* Remote Node will assign it*/
msg->srcaddr = scp->addrloc;
msg->services = scp->services_loc; /* Requested flow control */
msg->info = scp->info_loc; /* Version Number */
msg->segsize = dn_htons(scp->segsize_loc); /* Max segment size */
if (scp->peer.sdn_objnum)
type = 0;
skb_put(skb, dn_sockaddr2username(&scp->peer,
skb_tail_pointer(skb), type));
skb_put(skb, dn_sockaddr2username(&scp->addr,
skb_tail_pointer(skb), 2));
menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
if (scp->peer.sdn_flags & SDF_PROXY)
menuver |= DN_MENUVER_PRX;
if (scp->peer.sdn_flags & SDF_UICPROXY)
menuver |= DN_MENUVER_UIC;
*skb_put(skb, 1) = menuver; /* Menu Version */
aux = scp->accessdata.acc_userl;
*skb_put(skb, 1) = aux;
if (aux > 0)
memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
aux = scp->accessdata.acc_passl;
*skb_put(skb, 1) = aux;
if (aux > 0)
memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
aux = scp->accessdata.acc_accl;
*skb_put(skb, 1) = aux;
if (aux > 0)
memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
aux = (__u8)dn_ntohs(scp->conndata_out.opt_optl);
*skb_put(skb, 1) = aux;
if (aux > 0)
memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux);
scp->persist = dn_nsp_persist(sk);
scp->persist_fxn = dn_nsp_retrans_conninit;
cb->rt_flags = DN_RT_F_RQR;
dn_nsp_send(skb);
}
