Commit | Line | Data |
---|---|---|
4ab982ac | 1 | /* route.c 4.15 83/02/02 */ |
9d03c806 SL |
2 | |
3 | #include "../h/param.h" | |
ee787340 | 4 | #include "../h/systm.h" |
9d03c806 SL |
5 | #include "../h/mbuf.h" |
6 | #include "../h/protosw.h" | |
7 | #include "../h/socket.h" | |
ee787340 | 8 | #include "../h/ioctl.h" |
ee787340 | 9 | #include "../net/if.h" |
9d03c806 SL |
10 | #include "../net/af.h" |
11 | #include "../net/route.h" | |
c124e997 | 12 | #include <errno.h> |
9d03c806 | 13 | |
a13c006d | 14 | int rttrash; /* routes not in table but not freed */ |
9d03c806 SL |
15 | /* |
16 | * Packet routing routines. | |
17 | */ | |
f6311fb6 | 18 | rtalloc(ro) |
9d03c806 SL |
19 | register struct route *ro; |
20 | { | |
21 | register struct rtentry *rt, *rtmin; | |
22 | register struct mbuf *m; | |
9ccc7370 SL |
23 | register unsigned hash; |
24 | register int (*match)(); | |
9d03c806 SL |
25 | struct afhash h; |
26 | struct sockaddr *dst = &ro->ro_dst; | |
fc74f0c9 | 27 | int af = dst->sa_family; |
9d03c806 | 28 | |
f6311fb6 | 29 | if (ro->ro_rt && ro->ro_rt->rt_ifp) /* XXX */ |
9d03c806 | 30 | return; |
e65dcd4c SL |
31 | if (af >= AF_MAX) |
32 | return; | |
9d03c806 | 33 | (*afswitch[af].af_hash)(dst, &h); |
fc74f0c9 SL |
34 | rtmin = 0, hash = h.afh_hosthash; |
35 | for (m = rthost[hash % RTHASHSIZ]; m; m = m->m_next) { | |
9d03c806 | 36 | rt = mtod(m, struct rtentry *); |
fc74f0c9 SL |
37 | if (rt->rt_hash != hash) |
38 | continue; | |
90137845 SL |
39 | if ((rt->rt_flags & RTF_UP) == 0 || |
40 | (rt->rt_ifp->if_flags & IFF_UP) == 0) | |
41 | continue; | |
fc74f0c9 | 42 | if (bcmp((caddr_t)&rt->rt_dst, (caddr_t)dst, sizeof (*dst))) |
9d03c806 | 43 | continue; |
9d03c806 SL |
44 | if (rtmin == 0 || rt->rt_use < rtmin->rt_use) |
45 | rtmin = rt; | |
46 | } | |
fc74f0c9 SL |
47 | if (rtmin) |
48 | goto found; | |
49 | ||
50 | hash = h.afh_nethash; | |
51 | match = afswitch[af].af_netmatch; | |
52 | for (m = rtnet[hash % RTHASHSIZ]; m; m = m->m_next) { | |
53 | rt = mtod(m, struct rtentry *); | |
54 | if (rt->rt_hash != hash) | |
55 | continue; | |
90137845 SL |
56 | if ((rt->rt_flags & RTF_UP) == 0 || |
57 | (rt->rt_ifp->if_flags & IFF_UP) == 0) | |
58 | continue; | |
fc74f0c9 SL |
59 | if (rt->rt_dst.sa_family != af || !(*match)(&rt->rt_dst, dst)) |
60 | continue; | |
61 | if (rtmin == 0 || rt->rt_use < rtmin->rt_use) | |
62 | rtmin = rt; | |
9d03c806 | 63 | } |
fc74f0c9 SL |
64 | found: |
65 | ro->ro_rt = rtmin; | |
a9f3e174 SL |
66 | if (rtmin) |
67 | rtmin->rt_refcnt++; | |
9d03c806 SL |
68 | } |
69 | ||
f6311fb6 | 70 | rtfree(rt) |
c124e997 SL |
71 | register struct rtentry *rt; |
72 | { | |
f6311fb6 | 73 | |
c124e997 | 74 | if (rt == 0) |
a1edc12b | 75 | panic("rtfree"); |
c124e997 | 76 | rt->rt_refcnt--; |
a13c006d BJ |
77 | if (rt->rt_refcnt == 0 && (rt->rt_flags&RTF_UP) == 0) { |
78 | rttrash--; | |
79 | (void) m_free(dtom(rt)); | |
80 | } | |
c124e997 SL |
81 | } |
82 | ||
9d03c806 | 83 | /* |
c124e997 SL |
84 | * Carry out a request to change the routing table. Called by |
85 | * interfaces at boot time to make their ``local routes'' known | |
86 | * and for ioctl's. | |
9d03c806 | 87 | */ |
a13c006d | 88 | rtrequest(req, entry) |
9d03c806 | 89 | int req; |
a13c006d | 90 | register struct rtentry *entry; |
9d03c806 | 91 | { |
9d03c806 | 92 | register struct mbuf *m, **mprev; |
a13c006d | 93 | register struct rtentry *rt; |
9d03c806 | 94 | struct afhash h; |
a13c006d BJ |
95 | int af, s, error = 0, hash, (*match)(); |
96 | struct ifnet *ifp; | |
9d03c806 | 97 | |
a13c006d | 98 | af = entry->rt_dst.sa_family; |
e65dcd4c SL |
99 | if (af >= AF_MAX) |
100 | return (EAFNOSUPPORT); | |
a13c006d BJ |
101 | (*afswitch[af].af_hash)(&entry->rt_dst, &h); |
102 | if (entry->rt_flags & RTF_HOST) { | |
d7887ae9 BJ |
103 | hash = h.afh_hosthash; |
104 | mprev = &rthost[hash % RTHASHSIZ]; | |
105 | } else { | |
106 | hash = h.afh_nethash; | |
107 | mprev = &rtnet[hash % RTHASHSIZ]; | |
108 | } | |
109 | match = afswitch[af].af_netmatch; | |
c124e997 | 110 | s = splimp(); |
9d03c806 SL |
111 | for (; m = *mprev; mprev = &m->m_next) { |
112 | rt = mtod(m, struct rtentry *); | |
fc74f0c9 | 113 | if (rt->rt_hash != hash) |
9d03c806 | 114 | continue; |
a13c006d BJ |
115 | if (entry->rt_flags & RTF_HOST) { |
116 | #define equal(a1, a2) \ | |
117 | (bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof (struct sockaddr)) == 0) | |
118 | if (!equal(&rt->rt_dst, &entry->rt_dst)) | |
9d03c806 SL |
119 | continue; |
120 | } else { | |
a13c006d BJ |
121 | if (rt->rt_dst.sa_family != entry->rt_dst.sa_family || |
122 | (*match)(&rt->rt_dst, &entry->rt_dst) == 0) | |
9d03c806 SL |
123 | continue; |
124 | } | |
a13c006d | 125 | if (equal(&rt->rt_gateway, &entry->rt_gateway)) |
d7887ae9 | 126 | break; |
c124e997 | 127 | } |
9d03c806 SL |
128 | switch (req) { |
129 | ||
130 | case SIOCDELRT: | |
d7887ae9 BJ |
131 | if (m == 0) { |
132 | error = ESRCH; | |
133 | goto bad; | |
134 | } | |
a13c006d | 135 | *mprev = m->m_next; |
d7887ae9 | 136 | if (rt->rt_refcnt > 0) { |
a13c006d BJ |
137 | rt->rt_flags &= ~RTF_UP; |
138 | rttrash++; | |
139 | m->m_next = 0; | |
140 | } else | |
141 | (void) m_free(m); | |
9d03c806 SL |
142 | break; |
143 | ||
144 | case SIOCADDRT: | |
a13c006d | 145 | if (m) { |
d7887ae9 BJ |
146 | error = EEXIST; |
147 | goto bad; | |
148 | } | |
a13c006d BJ |
149 | ifp = if_ifwithaddr(&entry->rt_gateway); |
150 | if (ifp == 0) { | |
151 | ifp = if_ifwithnet(&entry->rt_gateway); | |
152 | if (ifp == 0) { | |
153 | error = ENETUNREACH; | |
154 | goto bad; | |
155 | } | |
156 | } | |
cce93e4b | 157 | m = m_get(M_DONTWAIT, MT_RTABLE); |
c124e997 SL |
158 | if (m == 0) { |
159 | error = ENOBUFS; | |
d7887ae9 | 160 | goto bad; |
c124e997 | 161 | } |
a13c006d | 162 | *mprev = m; |
9d03c806 | 163 | m->m_off = MMINOFF; |
f6311fb6 | 164 | m->m_len = sizeof (struct rtentry); |
9d03c806 | 165 | rt = mtod(m, struct rtentry *); |
d7887ae9 | 166 | rt->rt_hash = hash; |
a13c006d BJ |
167 | rt->rt_dst = entry->rt_dst; |
168 | rt->rt_gateway = entry->rt_gateway; | |
169 | rt->rt_flags = | |
170 | RTF_UP | (entry->rt_flags & (RTF_HOST|RTF_GATEWAY)); | |
fc74f0c9 | 171 | rt->rt_refcnt = 0; |
a13c006d BJ |
172 | rt->rt_use = 0; |
173 | rt->rt_ifp = ifp; | |
9d03c806 SL |
174 | break; |
175 | } | |
c124e997 SL |
176 | bad: |
177 | splx(s); | |
178 | return (error); | |
9d03c806 | 179 | } |
f6311fb6 SL |
180 | |
181 | /* | |
182 | * Set up a routing table entry, normally | |
183 | * for an interface. | |
184 | */ | |
185 | rtinit(dst, gateway, flags) | |
186 | struct sockaddr *dst, *gateway; | |
187 | int flags; | |
188 | { | |
189 | struct rtentry route; | |
f6311fb6 | 190 | |
a13c006d | 191 | bzero((caddr_t)&route, sizeof (route)); |
f6311fb6 SL |
192 | route.rt_dst = *dst; |
193 | route.rt_gateway = *gateway; | |
194 | route.rt_flags = flags; | |
a1edc12b | 195 | (void) rtrequest((int)SIOCADDRT, &route); |
f6311fb6 | 196 | } |