Commit | Line | Data |
---|---|---|
a1edc12b | 1 | /* route.c 4.13 82/10/17 */ |
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; | |
fc74f0c9 | 23 | register int hash, (*match)(); |
9d03c806 SL |
24 | struct afhash h; |
25 | struct sockaddr *dst = &ro->ro_dst; | |
fc74f0c9 | 26 | int af = dst->sa_family; |
9d03c806 | 27 | |
f6311fb6 | 28 | if (ro->ro_rt && ro->ro_rt->rt_ifp) /* XXX */ |
9d03c806 | 29 | return; |
e65dcd4c SL |
30 | if (af >= AF_MAX) |
31 | return; | |
9d03c806 | 32 | (*afswitch[af].af_hash)(dst, &h); |
fc74f0c9 SL |
33 | rtmin = 0, hash = h.afh_hosthash; |
34 | for (m = rthost[hash % RTHASHSIZ]; m; m = m->m_next) { | |
9d03c806 | 35 | rt = mtod(m, struct rtentry *); |
fc74f0c9 SL |
36 | if (rt->rt_hash != hash) |
37 | continue; | |
90137845 SL |
38 | if ((rt->rt_flags & RTF_UP) == 0 || |
39 | (rt->rt_ifp->if_flags & IFF_UP) == 0) | |
40 | continue; | |
fc74f0c9 | 41 | if (bcmp((caddr_t)&rt->rt_dst, (caddr_t)dst, sizeof (*dst))) |
9d03c806 | 42 | continue; |
9d03c806 SL |
43 | if (rtmin == 0 || rt->rt_use < rtmin->rt_use) |
44 | rtmin = rt; | |
45 | } | |
fc74f0c9 SL |
46 | if (rtmin) |
47 | goto found; | |
48 | ||
49 | hash = h.afh_nethash; | |
50 | match = afswitch[af].af_netmatch; | |
51 | for (m = rtnet[hash % RTHASHSIZ]; m; m = m->m_next) { | |
52 | rt = mtod(m, struct rtentry *); | |
53 | if (rt->rt_hash != hash) | |
54 | continue; | |
90137845 SL |
55 | if ((rt->rt_flags & RTF_UP) == 0 || |
56 | (rt->rt_ifp->if_flags & IFF_UP) == 0) | |
57 | continue; | |
fc74f0c9 SL |
58 | if (rt->rt_dst.sa_family != af || !(*match)(&rt->rt_dst, dst)) |
59 | continue; | |
60 | if (rtmin == 0 || rt->rt_use < rtmin->rt_use) | |
61 | rtmin = rt; | |
9d03c806 | 62 | } |
fc74f0c9 SL |
63 | found: |
64 | ro->ro_rt = rtmin; | |
a9f3e174 SL |
65 | if (rtmin) |
66 | rtmin->rt_refcnt++; | |
9d03c806 SL |
67 | } |
68 | ||
f6311fb6 | 69 | rtfree(rt) |
c124e997 SL |
70 | register struct rtentry *rt; |
71 | { | |
f6311fb6 | 72 | |
c124e997 | 73 | if (rt == 0) |
a1edc12b | 74 | panic("rtfree"); |
c124e997 | 75 | rt->rt_refcnt--; |
a13c006d BJ |
76 | if (rt->rt_refcnt == 0 && (rt->rt_flags&RTF_UP) == 0) { |
77 | rttrash--; | |
78 | (void) m_free(dtom(rt)); | |
79 | } | |
c124e997 SL |
80 | } |
81 | ||
9d03c806 | 82 | /* |
c124e997 SL |
83 | * Carry out a request to change the routing table. Called by |
84 | * interfaces at boot time to make their ``local routes'' known | |
85 | * and for ioctl's. | |
9d03c806 | 86 | */ |
a13c006d | 87 | rtrequest(req, entry) |
9d03c806 | 88 | int req; |
a13c006d | 89 | register struct rtentry *entry; |
9d03c806 | 90 | { |
9d03c806 | 91 | register struct mbuf *m, **mprev; |
a13c006d | 92 | register struct rtentry *rt; |
9d03c806 | 93 | struct afhash h; |
a13c006d BJ |
94 | int af, s, error = 0, hash, (*match)(); |
95 | struct ifnet *ifp; | |
9d03c806 | 96 | |
a13c006d | 97 | af = entry->rt_dst.sa_family; |
e65dcd4c SL |
98 | if (af >= AF_MAX) |
99 | return (EAFNOSUPPORT); | |
a13c006d BJ |
100 | (*afswitch[af].af_hash)(&entry->rt_dst, &h); |
101 | if (entry->rt_flags & RTF_HOST) { | |
d7887ae9 BJ |
102 | hash = h.afh_hosthash; |
103 | mprev = &rthost[hash % RTHASHSIZ]; | |
104 | } else { | |
105 | hash = h.afh_nethash; | |
106 | mprev = &rtnet[hash % RTHASHSIZ]; | |
107 | } | |
108 | match = afswitch[af].af_netmatch; | |
c124e997 | 109 | s = splimp(); |
9d03c806 SL |
110 | for (; m = *mprev; mprev = &m->m_next) { |
111 | rt = mtod(m, struct rtentry *); | |
fc74f0c9 | 112 | if (rt->rt_hash != hash) |
9d03c806 | 113 | continue; |
a13c006d BJ |
114 | if (entry->rt_flags & RTF_HOST) { |
115 | #define equal(a1, a2) \ | |
116 | (bcmp((caddr_t)(a1), (caddr_t)(a2), sizeof (struct sockaddr)) == 0) | |
117 | if (!equal(&rt->rt_dst, &entry->rt_dst)) | |
9d03c806 SL |
118 | continue; |
119 | } else { | |
a13c006d BJ |
120 | if (rt->rt_dst.sa_family != entry->rt_dst.sa_family || |
121 | (*match)(&rt->rt_dst, &entry->rt_dst) == 0) | |
9d03c806 SL |
122 | continue; |
123 | } | |
a13c006d | 124 | if (equal(&rt->rt_gateway, &entry->rt_gateway)) |
d7887ae9 | 125 | break; |
c124e997 | 126 | } |
9d03c806 SL |
127 | switch (req) { |
128 | ||
129 | case SIOCDELRT: | |
d7887ae9 BJ |
130 | if (m == 0) { |
131 | error = ESRCH; | |
132 | goto bad; | |
133 | } | |
a13c006d | 134 | *mprev = m->m_next; |
d7887ae9 | 135 | if (rt->rt_refcnt > 0) { |
a13c006d BJ |
136 | rt->rt_flags &= ~RTF_UP; |
137 | rttrash++; | |
138 | m->m_next = 0; | |
139 | } else | |
140 | (void) m_free(m); | |
9d03c806 SL |
141 | break; |
142 | ||
143 | case SIOCADDRT: | |
a13c006d | 144 | if (m) { |
d7887ae9 BJ |
145 | error = EEXIST; |
146 | goto bad; | |
147 | } | |
a13c006d BJ |
148 | ifp = if_ifwithaddr(&entry->rt_gateway); |
149 | if (ifp == 0) { | |
150 | ifp = if_ifwithnet(&entry->rt_gateway); | |
151 | if (ifp == 0) { | |
152 | error = ENETUNREACH; | |
153 | goto bad; | |
154 | } | |
155 | } | |
f6311fb6 | 156 | m = m_get(M_DONTWAIT); |
c124e997 SL |
157 | if (m == 0) { |
158 | error = ENOBUFS; | |
d7887ae9 | 159 | goto bad; |
c124e997 | 160 | } |
a13c006d | 161 | *mprev = m; |
9d03c806 | 162 | m->m_off = MMINOFF; |
f6311fb6 | 163 | m->m_len = sizeof (struct rtentry); |
9d03c806 | 164 | rt = mtod(m, struct rtentry *); |
d7887ae9 | 165 | rt->rt_hash = hash; |
a13c006d BJ |
166 | rt->rt_dst = entry->rt_dst; |
167 | rt->rt_gateway = entry->rt_gateway; | |
168 | rt->rt_flags = | |
169 | RTF_UP | (entry->rt_flags & (RTF_HOST|RTF_GATEWAY)); | |
fc74f0c9 | 170 | rt->rt_refcnt = 0; |
a13c006d BJ |
171 | rt->rt_use = 0; |
172 | rt->rt_ifp = ifp; | |
9d03c806 SL |
173 | break; |
174 | } | |
c124e997 SL |
175 | bad: |
176 | splx(s); | |
177 | return (error); | |
9d03c806 | 178 | } |
f6311fb6 SL |
179 | |
180 | /* | |
181 | * Set up a routing table entry, normally | |
182 | * for an interface. | |
183 | */ | |
184 | rtinit(dst, gateway, flags) | |
185 | struct sockaddr *dst, *gateway; | |
186 | int flags; | |
187 | { | |
188 | struct rtentry route; | |
f6311fb6 | 189 | |
a13c006d | 190 | bzero((caddr_t)&route, sizeof (route)); |
f6311fb6 SL |
191 | route.rt_dst = *dst; |
192 | route.rt_gateway = *gateway; | |
193 | route.rt_flags = flags; | |
a1edc12b | 194 | (void) rtrequest((int)SIOCADDRT, &route); |
f6311fb6 | 195 | } |