Commit | Line | Data |
---|---|---|
5e3649c6 | 1 | /* nsp_subr.c 1.3 82/10/09 */ |
01abe28d SL |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/mbuf.h" | |
6 | #include "../h/protosw.h" | |
7 | #include "../h/socket.h" | |
8 | #include "../h/socketvar.h" | |
5e3649c6 BJ |
9 | #include "../netdecnet/dn_systm.h" |
10 | #include "../netdecnet/nsp.h" | |
11 | #include "../netdecnet/nsp_var.h" | |
12 | #include <errno.h> | |
01abe28d SL |
13 | |
14 | extern int nspidebug; | |
15 | #define printd if(nspidebug)printf | |
16 | ||
17 | /* | |
18 | * NSP initialization | |
19 | */ | |
20 | nsp_init() | |
21 | { | |
22 | init queues | |
23 | what else? | |
24 | } | |
25 | ||
26 | /* | |
27 | * Nsp_chkaddr performs many functions common to the processing | |
28 | * of input packets. The arguments are: | |
29 | * m - the mbuf with the packet in it | |
30 | * srcnode - the srcnode from the transport header | |
31 | * type - the packet type, one of: | |
32 | * NSP_DATA, NSP_LS, NSP_INTR, NSP_DATACK, NSP_OTHACK | |
33 | * sp - pointer to a short to receive the segment number | |
34 | * | |
35 | * It performs the following functions: | |
36 | * 1. verify that the packet is of the correct minimum length | |
37 | * 2. find the associated NSP control block (by calling dn_addrtonspcb()) | |
38 | * 3. process any ack or nak and force retransmission or remove | |
39 | * acked data from the retransmit queue, as required | |
40 | * 4. update the mbuf to point past the segnum field | |
41 | * 5. return the segnum and nspcb pointer | |
42 | */ | |
43 | struct nspcb * | |
44 | nsp_chkaddr(m, srcnode, type, sp) | |
45 | struct mbuf *m; | |
46 | short srcnode; | |
47 | int type; | |
48 | u_short *sp; | |
49 | { | |
50 | register struct nspcb *np; | |
51 | struct nspd *n; | |
52 | u_short dstaddr; | |
53 | int ack, qual, num; | |
54 | ||
55 | /* make sure we are accessing valid data */ | |
56 | if (m->m_len < sizeof (struct nspd) - sizeof (d_short)) { | |
57 | m_freem(m); | |
58 | return (0); | |
59 | } | |
60 | n = mtod(m, struct nspd *); | |
61 | dstaddr = D_SHORT(n->nsp_dstaddr); | |
62 | np = dn_addrtonspcb(dstaddr); | |
63 | if (np == 0) { | |
64 | no such address, return "no link" message | |
65 | } | |
66 | if (np->n_node != srcnode) { | |
67 | printf("nsp_chkaddr: n_node %d, srcnode %d\n", np->n_node, | |
68 | scrnode); | |
69 | m_freem(m); | |
70 | return (0); | |
71 | } | |
72 | /* make sure remote addresses match (consistency check) */ | |
73 | if (np->n_rem != D_SHORT(n->nsp_srcaddr)) { | |
74 | printf("nsp_chkaddr: n_rem %d, srcaddr %d\n", np->n_rem, | |
75 | D_SHORT(n->nsp_srcaddr)); | |
76 | m_freem(m); | |
77 | return (0); | |
78 | } | |
79 | ack = D_SHORT(n->nsp_acknum); | |
80 | if (ack & NSPA_ACK) { | |
81 | qual = ack & NSPA_QUAL; | |
82 | num = ack & NSPA_NUM; | |
83 | printd(", qual 0x%x, num %d", qual, num); | |
84 | /* make sure there's room for a segnum */ | |
85 | if (m->m_len < sizeof (struct nspd)) { | |
86 | m_freem(m); | |
87 | return (0); | |
88 | } | |
89 | if (type == NSP_DATA) { | |
90 | if (SEQ_GTR(num, np->na_rcvdat) && | |
91 | SEQ_LEQ(num, np->nn_high)) { | |
92 | np->n_retrans = 0; | |
93 | np->nf_remdat -= SEQ_SUB(num, np->na_rcvdat); | |
94 | } | |
95 | if (qual == NSPA_NAK || SEQ_LEQ(np->nn_dat, num)) | |
96 | np->nn_dat = SEQ_ADD(num, 1); | |
97 | np->na_rcvdat = num; | |
98 | nsp_purgertq(np, type); | |
99 | } else if (n == np->nn_oth && (np->n_flags&NF_OTHSENT)) { | |
100 | if (qual == NSPA_NAK) { | |
101 | /* force retransmission of other data seg */ | |
102 | printf("nsp_chkaddr: NAK other\n"); | |
103 | } else { | |
104 | np->n_flags &= ~NF_OTHSENT; | |
105 | np->nn_oth = SEQ_ADD(np->nn_oth, 1); | |
106 | if (np->n_flags & NF_OTHINTR) { | |
107 | np->n_flags &= | |
108 | ~(NF_OTHINTR|NF_INTAVAIL); | |
109 | if (np->nb_xmt) | |
110 | m_freem(np->nb_xmt); | |
111 | } else | |
112 | np->nf_locdat = 0; | |
113 | nsp_purgertq(np, type); | |
114 | } | |
115 | } | |
116 | *sp = D_SHORT(n->nsp_segnum); | |
117 | num = sizeof (struct nspd); | |
118 | } else { | |
119 | *sp = (u_short)ack; | |
120 | num = sizeof (struct nspd) - sizeof (u_short); | |
121 | } | |
122 | m->m_len -= num; | |
123 | m->m_off += num; | |
124 | return (np); | |
125 | } |