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kernel-netlink: Add global option to configure MSS-clamping on installed routes

This commit is contained in:
Tobias Brunner 2014-08-04 15:57:46 +02:00
parent c1adf7e0c4
commit 47a0e289d9
2 changed files with 29 additions and 6 deletions
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3
conf/plugins/kernel-netlink.opt
View File

@ -7,6 +7,9 @@ charon.plugins.kernel-netlink.fwmark =
inverts the meaning (i.e. the rule only applies to packets that don't match
the mark).
charon.plugins.kernel-netlink.mss = 0
MSS to set on installed routes, 0 to disable.
charon.plugins.kernel-netlink.mtu = 0
MTU to set on installed routes, 0 to disable.

32
src/libhydra/plugins/kernel_netlink/kernel_netlink_net.c
View File

@ -483,6 +483,11 @@ struct private_kernel_netlink_net_t {
* MTU to set on installed routes
*/
u_int32_t mtu;
/**
* MSS to set on installed routes
*/
u_int32_t mss;
};
/**
@ -2113,14 +2118,27 @@ static status_t manage_srcroute(private_kernel_netlink_net_t *this,
chunk.len = sizeof(ifindex);
netlink_add_attribute(hdr, RTA_OIF, chunk, sizeof(request));
if (this->mtu)
if (this->mtu || this->mss)
{
chunk = chunk_alloca(RTA_LENGTH(sizeof(struct rtattr) +
sizeof(u_int32_t)));
chunk = chunk_alloca(RTA_LENGTH((sizeof(struct rtattr) +
sizeof(u_int32_t)) * 2));
chunk.len = 0;
rta = (struct rtattr*)chunk.ptr;
rta->rta_type = RTAX_MTU;
rta->rta_len = chunk.len;
memcpy(RTA_DATA(rta), &this->mtu, sizeof(u_int32_t));
if (this->mtu)
{
rta->rta_type = RTAX_MTU;
rta->rta_len = RTA_LENGTH(sizeof(u_int32_t));
memcpy(RTA_DATA(rta), &this->mtu, sizeof(u_int32_t));
chunk.len = rta->rta_len;
}
if (this->mss)
{
rta = (struct rtattr*)(chunk.ptr + RTA_ALIGN(chunk.len));
rta->rta_type = RTAX_ADVMSS;
rta->rta_len = RTA_LENGTH(sizeof(u_int32_t));
memcpy(RTA_DATA(rta), &this->mss, sizeof(u_int32_t));
chunk.len = RTA_ALIGN(chunk.len) + rta->rta_len;
}
netlink_add_attribute(hdr, RTA_METRICS, chunk, sizeof(request));
}
@ -2485,6 +2503,8 @@ kernel_netlink_net_t *kernel_netlink_net_create()
"%s.plugins.kernel-netlink.roam_events", TRUE, lib->ns),
.mtu = lib->settings->get_int(lib->settings,
"%s.plugins.kernel-netlink.mtu", 0, lib->ns),
.mss = lib->settings->get_int(lib->settings,
"%s.plugins.kernel-netlink.mss", 0, lib->ns),
);
timerclear(&this->last_route_reinstall);
timerclear(&this->next_roam);