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Make substructures for IPv4 and IPv6 specific context information

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The context structure contains a batch of fields specific to IPv4 and to
IPv6 connectivity.  Split those out into a sub-structure.

This allows the conf_ip4() and conf_ip6() functions, which take the
entire context but touch very little of it, to be given more specific
parameters, making it clearer what it affects without stepping through the
code.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2022-07-22 15:31:18 +10:00 • committed by Stefano Brivio
parent 5e12d23acb
commit 16f5586bb8
12 changed files with 232 additions and 212 deletions

22
dhcp.c
View file

@ -332,20 +332,20 @@ int dhcp(const struct ctx *c, const struct pool *p)
m->chaddr[0], m->chaddr[1], m->chaddr[2],
m->chaddr[3], m->chaddr[4], m->chaddr[5]);
m->yiaddr = c->addr4;
memcpy(opts[1].s, &c->mask4, sizeof(c->mask4));
memcpy(opts[3].s, &c->gw4, sizeof(c->gw4));
memcpy(opts[54].s, &c->gw4, sizeof(c->gw4));
m->yiaddr = c->ip4.addr;
memcpy(opts[1].s, &c->ip4.mask, sizeof(c->ip4.mask));
memcpy(opts[3].s, &c->ip4.gw, sizeof(c->ip4.gw));
memcpy(opts[54].s, &c->ip4.gw, sizeof(c->ip4.gw));
/* If the gateway is not on the assigned subnet, send an option 121
* (Classless Static Routing) adding a dummy route to it.
*/
if ((c->addr4 & c->mask4) != (c->gw4 & c->mask4)) {
if ((c->ip4.addr & c->ip4.mask) != (c->ip4.gw & c->ip4.mask)) {
/* a.b.c.d/32:0.0.0.0, 0:a.b.c.d */
opts[121].slen = 14;
opts[121].s[0] = 32;
memcpy(opts[121].s + 1, &c->gw4, sizeof(c->gw4));
memcpy(opts[121].s + 10, &c->gw4, sizeof(c->gw4));
memcpy(opts[121].s + 1, &c->ip4.gw, sizeof(c->ip4.gw));
memcpy(opts[121].s + 10, &c->ip4.gw, sizeof(c->ip4.gw));
}
if (c->mtu != -1) {
@ -354,8 +354,8 @@ int dhcp(const struct ctx *c, const struct pool *p)
opts[26].s[1] = c->mtu % 256;
}
for (i = 0, opts[6].slen = 0; !c->no_dhcp_dns && c->dns4[i]; i++) {
((uint32_t *)opts[6].s)[i] = c->dns4[i];
for (i = 0, opts[6].slen = 0; !c->no_dhcp_dns && c->ip4.dns[i]; i++) {
((uint32_t *)opts[6].s)[i] = c->ip4.dns[i];
opts[6].slen += sizeof(uint32_t);
}
@ -368,8 +368,8 @@ int dhcp(const struct ctx *c, const struct pool *p)
uh->dest = htons(68);
iph->tot_len = htons(len += sizeof(*iph));
iph->daddr = c->addr4;
iph->saddr = c->gw4;
iph->daddr = c->ip4.addr;
iph->saddr = c->ip4.gw;
iph->check = 0;
iph->check = csum_unaligned(iph, (intptr_t)(iph->ihl * 4), 0);