Commit | Line | Data |
---|---|---|
5afc289d MK |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
6 | * @(#)ip_output.c 6.8 (Berkeley) %G% | |
7 | */ | |
6e8b2eca | 8 | |
20666ad3 JB |
9 | #include "param.h" |
10 | #include "mbuf.h" | |
11 | #include "errno.h" | |
12 | #include "socket.h" | |
13 | #include "socketvar.h" | |
f4d55810 SL |
14 | |
15 | #include "../net/if.h" | |
16 | #include "../net/route.h" | |
17 | ||
20666ad3 JB |
18 | #include "in.h" |
19 | #include "in_systm.h" | |
dfce8240 | 20 | #include "in_var.h" |
20666ad3 JB |
21 | #include "ip.h" |
22 | #include "ip_var.h" | |
f4d55810 | 23 | |
b152d3c4 SL |
24 | #ifdef vax |
25 | #include "../vax/mtpr.h" | |
26 | #endif | |
ac904f92 | 27 | |
0e3f761f | 28 | ip_output(m, opt, ro, flags) |
2b4b57cd | 29 | struct mbuf *m; |
8a13b737 | 30 | struct mbuf *opt; |
ee787340 | 31 | struct route *ro; |
0e3f761f | 32 | int flags; |
ac904f92 | 33 | { |
2b4b57cd | 34 | register struct ip *ip = mtod(m, struct ip *); |
8a13b737 | 35 | register struct ifnet *ifp; |
8a2f82db | 36 | int len, hlen = sizeof (struct ip), off, error = 0; |
ee787340 | 37 | struct route iproute; |
a8671e7e | 38 | struct sockaddr_in *dst; |
ac904f92 | 39 | |
2d82c10d | 40 | if (opt) /* XXX */ |
89e6227e | 41 | (void) m_free(opt); /* XXX */ |
e8d11875 | 42 | /* |
2b4b57cd | 43 | * Fill in IP header. |
e8d11875 | 44 | */ |
0e3f761f SL |
45 | if ((flags & IP_FORWARDING) == 0) { |
46 | ip->ip_v = IPVERSION; | |
47 | ip->ip_off &= IP_DF; | |
48 | ip->ip_id = htons(ip_id++); | |
4adcd589 | 49 | ip->ip_hl = hlen >> 2; |
dfce8240 | 50 | } |
8a13b737 BJ |
51 | |
52 | /* | |
a13c006d | 53 | * Route packet. |
8a13b737 | 54 | */ |
ee787340 SL |
55 | if (ro == 0) { |
56 | ro = &iproute; | |
57 | bzero((caddr_t)ro, sizeof (*ro)); | |
58 | } | |
a8671e7e | 59 | dst = (struct sockaddr_in *)&ro->ro_dst; |
ee787340 | 60 | if (ro->ro_rt == 0) { |
a8671e7e SL |
61 | dst->sin_family = AF_INET; |
62 | dst->sin_addr = ip->ip_dst; | |
a13c006d | 63 | /* |
0e3f761f SL |
64 | * If routing to interface only, |
65 | * short circuit routing lookup. | |
a13c006d | 66 | */ |
0e3f761f | 67 | if (flags & IP_ROUTETOIF) { |
dfce8240 MK |
68 | struct in_ifaddr *ia; |
69 | ia = in_iaonnetof(in_netof(ip->ip_dst)); | |
70 | if (ia == 0) { | |
0e3f761f SL |
71 | error = ENETUNREACH; |
72 | goto bad; | |
73 | } | |
dfce8240 | 74 | ifp = ia->ia_ifp; |
a13c006d BJ |
75 | goto gotif; |
76 | } | |
f6311fb6 | 77 | rtalloc(ro); |
4adcd589 | 78 | } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) { |
ffb7b765 MK |
79 | /* |
80 | * The old route has gone away; try for a new one. | |
81 | */ | |
82 | rtfree(ro->ro_rt); | |
dfce8240 | 83 | ro->ro_rt = NULL; |
ffb7b765 | 84 | rtalloc(ro); |
8a13b737 | 85 | } |
0e3f761f SL |
86 | if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) { |
87 | error = ENETUNREACH; | |
88 | goto bad; | |
89 | } | |
a13c006d | 90 | ro->ro_rt->rt_use++; |
ebef8376 | 91 | if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST)) |
a8671e7e | 92 | dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway; |
a13c006d | 93 | gotif: |
5afc289d MK |
94 | #ifndef notdef |
95 | /* | |
96 | * If source address not specified yet, use address | |
97 | * of outgoing interface. | |
98 | */ | |
99 | if (ip->ip_src.s_addr == INADDR_ANY) { | |
100 | register struct in_ifaddr *ia; | |
101 | ||
102 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
103 | if (ia->ia_ifp == ifp) { | |
104 | ip->ip_src = IA_SIN(ia)->sin_addr; | |
105 | break; | |
106 | } | |
107 | } | |
108 | #endif | |
a13c006d | 109 | /* |
af099287 SL |
110 | * Look for broadcast address and |
111 | * and verify user is allowed to send | |
19f96414 | 112 | * such a packet. |
a13c006d | 113 | */ |
dfce8240 | 114 | if (in_broadcast(dst->sin_addr)) { |
19f96414 SL |
115 | if ((ifp->if_flags & IFF_BROADCAST) == 0) { |
116 | error = EADDRNOTAVAIL; | |
117 | goto bad; | |
118 | } | |
0e3f761f | 119 | if ((flags & IP_ALLOWBROADCAST) == 0) { |
a13c006d | 120 | error = EACCES; |
ee787340 | 121 | goto bad; |
8a2f82db | 122 | } |
19f96414 SL |
123 | /* don't allow broadcast messages to be fragmented */ |
124 | if (ip->ip_len > ifp->if_mtu) { | |
125 | error = EMSGSIZE; | |
126 | goto bad; | |
127 | } | |
ee787340 | 128 | } |
ac904f92 | 129 | |
2b4b57cd BJ |
130 | /* |
131 | * If small enough for interface, can just send directly. | |
132 | */ | |
8a13b737 BJ |
133 | if (ip->ip_len <= ifp->if_mtu) { |
134 | ip->ip_len = htons((u_short)ip->ip_len); | |
135 | ip->ip_off = htons((u_short)ip->ip_off); | |
136 | ip->ip_sum = 0; | |
137 | ip->ip_sum = in_cksum(m, hlen); | |
a8671e7e | 138 | error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst); |
a13c006d | 139 | goto done; |
cdad2eb1 | 140 | } |
2b4b57cd BJ |
141 | |
142 | /* | |
143 | * Too large for interface; fragment if possible. | |
144 | * Must be able to put at least 8 bytes per fragment. | |
145 | */ | |
8a2f82db SL |
146 | if (ip->ip_off & IP_DF) { |
147 | error = EMSGSIZE; | |
2b4b57cd | 148 | goto bad; |
8a2f82db | 149 | } |
8a13b737 | 150 | len = (ifp->if_mtu - hlen) &~ 7; |
8a2f82db SL |
151 | if (len < 8) { |
152 | error = EMSGSIZE; | |
2b4b57cd | 153 | goto bad; |
8a2f82db | 154 | } |
2b4b57cd BJ |
155 | |
156 | /* | |
157 | * Discard IP header from logical mbuf for m_copy's sake. | |
158 | * Loop through length of segment, make a copy of each | |
159 | * part and output. | |
160 | */ | |
161 | m->m_len -= sizeof (struct ip); | |
162 | m->m_off += sizeof (struct ip); | |
0b49870f | 163 | for (off = 0; off < ip->ip_len-hlen; off += len) { |
22bd8cdc | 164 | struct mbuf *mh = m_get(M_DONTWAIT, MT_HEADER); |
2b4b57cd BJ |
165 | struct ip *mhip; |
166 | ||
8a2f82db SL |
167 | if (mh == 0) { |
168 | error = ENOBUFS; | |
2b4b57cd | 169 | goto bad; |
8a2f82db | 170 | } |
2b4b57cd BJ |
171 | mh->m_off = MMAXOFF - hlen; |
172 | mhip = mtod(mh, struct ip *); | |
173 | *mhip = *ip; | |
4ad99bae | 174 | if (hlen > sizeof (struct ip)) { |
2b4b57cd BJ |
175 | int olen = ip_optcopy(ip, mhip, off); |
176 | mh->m_len = sizeof (struct ip) + olen; | |
177 | } else | |
178 | mh->m_len = sizeof (struct ip); | |
e8f40dc9 | 179 | mhip->ip_off = off >> 3; |
4adcd589 MK |
180 | if (ip->ip_off & IP_MF) |
181 | mhip->ip_off |= IP_MF; | |
0b49870f BJ |
182 | if (off + len >= ip->ip_len-hlen) |
183 | len = mhip->ip_len = ip->ip_len - hlen - off; | |
2b4b57cd BJ |
184 | else { |
185 | mhip->ip_len = len; | |
186 | mhip->ip_off |= IP_MF; | |
98444525 | 187 | } |
e8f40dc9 | 188 | mhip->ip_len += sizeof (struct ip); |
e8f40dc9 | 189 | mhip->ip_len = htons((u_short)mhip->ip_len); |
2b4b57cd BJ |
190 | mh->m_next = m_copy(m, off, len); |
191 | if (mh->m_next == 0) { | |
2752c877 | 192 | (void) m_free(mh); |
8a2f82db | 193 | error = ENOBUFS; /* ??? */ |
2b4b57cd | 194 | goto bad; |
98444525 | 195 | } |
0b49870f | 196 | mhip->ip_off = htons((u_short)mhip->ip_off); |
0b49870f BJ |
197 | mhip->ip_sum = 0; |
198 | mhip->ip_sum = in_cksum(mh, hlen); | |
a8671e7e | 199 | if (error = (*ifp->if_output)(ifp, mh, (struct sockaddr *)dst)) |
8a2f82db | 200 | break; |
2b4b57cd BJ |
201 | } |
202 | bad: | |
203 | m_freem(m); | |
a13c006d | 204 | done: |
0e3f761f | 205 | if (ro == &iproute && (flags & IP_ROUTETOIF) == 0 && ro->ro_rt) |
a13c006d | 206 | RTFREE(ro->ro_rt); |
8a2f82db | 207 | return (error); |
2b4b57cd BJ |
208 | } |
209 | ||
210 | /* | |
211 | * Copy options from ip to jp. | |
4ad99bae | 212 | * If off is 0 all options are copied |
2b4b57cd BJ |
213 | * otherwise copy selectively. |
214 | */ | |
215 | ip_optcopy(ip, jp, off) | |
216 | struct ip *ip, *jp; | |
217 | int off; | |
218 | { | |
219 | register u_char *cp, *dp; | |
220 | int opt, optlen, cnt; | |
221 | ||
222 | cp = (u_char *)(ip + 1); | |
223 | dp = (u_char *)(jp + 1); | |
224 | cnt = (ip->ip_hl << 2) - sizeof (struct ip); | |
225 | for (; cnt > 0; cnt -= optlen, cp += optlen) { | |
226 | opt = cp[0]; | |
227 | if (opt == IPOPT_EOL) | |
228 | break; | |
229 | if (opt == IPOPT_NOP) | |
230 | optlen = 1; | |
231 | else | |
232 | optlen = cp[1]; | |
233 | if (optlen > cnt) /* XXX */ | |
234 | optlen = cnt; /* XXX */ | |
235 | if (off == 0 || IPOPT_COPIED(opt)) { | |
4ad99bae | 236 | bcopy((caddr_t)cp, (caddr_t)dp, (unsigned)optlen); |
2b4b57cd | 237 | dp += optlen; |
ac904f92 | 238 | } |
e8d11875 | 239 | } |
2b4b57cd BJ |
240 | for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) |
241 | *dp++ = IPOPT_EOL; | |
242 | return (optlen); | |
ac904f92 | 243 | } |