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#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include "linux_ppp.h"
#include "triton.h"
#include "events.h"
#include "ppp.h"
#include "ipdb.h"
#include "log.h"
// from /usr/include/linux/ipv6.h
struct in6_ifreq {
struct in6_addr ifr6_addr;
__u32 ifr6_prefixlen;
int ifr6_ifindex;
};
static void devconf(struct ppp_t *ppp, const char *attr, const char *val)
{
int fd;
char fname[PATH_MAX];
sprintf(fname, "/proc/sys/net/ipv6/conf/%s/%s", ppp->ifname, attr);
fd = open(fname, O_WRONLY);
if (!fd) {
log_ppp_error("ppp: failed to open '%s': %s\n", fname, strerror(errno));
return;
}
write(fd, val, strlen(val));
close(fd);
}
static void build_addr(struct ipv6db_addr_t *a, uint64_t intf_id, struct in6_addr *addr)
{
memcpy(addr, &a->addr, sizeof(*addr));
if (a->prefix_len <= 64)
*(uint64_t *)(addr->s6_addr + 8) = intf_id;
else
*(uint64_t *)(addr->s6_addr + 8) |= intf_id & ((1 << (128 - a->prefix_len)) - 1);
}
void ppp_ifup(struct ppp_t *ppp)
{
struct ipv6db_addr_t *a;
struct ifreq ifr;
struct in6_ifreq ifr6;
struct npioctl np;
struct sockaddr_in addr;
triton_event_fire(EV_SES_ACCT_START, ppp);
if (ppp->stop_time)
return;
triton_event_fire(EV_SES_PRE_UP, ppp);
if (ppp->stop_time)
return;
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, ppp->ifname);
if (ppp->ses.ipv4) {
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = ppp->ses.ipv4->addr;
memcpy(&ifr.ifr_addr,&addr,sizeof(addr));
if (ioctl(sock_fd, SIOCSIFADDR, &ifr))
log_ppp_error("ppp: failed to set IPv4 address: %s\n", strerror(errno));
addr.sin_addr.s_addr = ppp->ses.ipv4->peer_addr;
memcpy(&ifr.ifr_dstaddr,&addr,sizeof(addr));
if (ioctl(sock_fd, SIOCSIFDSTADDR, &ifr))
log_ppp_error("ppp: failed to set peer IPv4 address: %s\n", strerror(errno));
}
if (ppp->ses.ipv6) {
devconf(ppp, "accept_ra", "0");
devconf(ppp, "autoconf", "0");
devconf(ppp, "forwarding", "1");
memset(&ifr6, 0, sizeof(ifr6));
ifr6.ifr6_addr.s6_addr32[0] = htons(0xfe80);
*(uint64_t *)(ifr6.ifr6_addr.s6_addr + 8) = ppp->ses.ipv6->intf_id;
ifr6.ifr6_prefixlen = 64;
ifr6.ifr6_ifindex = ppp->ifindex;
if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6))
log_ppp_error("ppp: faild to set LL IPv6 address: %s\n", strerror(errno));
list_for_each_entry(a, &ppp->ses.ipv6->addr_list, entry) {
if (a->prefix_len == 128)
continue;
build_addr(a, ppp->ses.ipv6->intf_id, &ifr6.ifr6_addr);
ifr6.ifr6_prefixlen = a->prefix_len;
if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6))
log_ppp_error("ppp: failed to add IPv6 address: %s\n", strerror(errno));
}
}
if (ioctl(sock_fd, SIOCGIFFLAGS, &ifr))
log_ppp_error("ppp: failed to get interface flags: %s\n", strerror(errno));
ifr.ifr_flags |= IFF_UP | IFF_POINTOPOINT;
if (ioctl(sock_fd, SIOCSIFFLAGS, &ifr))
log_ppp_error("ppp: failed to set interface flags: %s\n", strerror(errno));
if (ppp->ses.ipv4) {
np.protocol = PPP_IP;
np.mode = NPMODE_PASS;
if (ioctl(ppp->unit_fd, PPPIOCSNPMODE, &np))
log_ppp_error("ppp: failed to set NP (IPv4) mode: %s\n", strerror(errno));
}
if (ppp->ses.ipv6) {
np.protocol = PPP_IPV6;
np.mode = NPMODE_PASS;
if (ioctl(ppp->unit_fd, PPPIOCSNPMODE, &np))
log_ppp_error("ppp: failed to set NP (IPv6) mode: %s\n", strerror(errno));
}
ppp->ses.ctrl->started(ppp);
triton_event_fire(EV_SES_STARTED, ppp);
}
void __export ppp_ifdown(struct ppp_t *ppp)
{
struct ifreq ifr;
struct sockaddr_in addr;
struct in6_ifreq ifr6;
struct ipv6db_addr_t *a;
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, ppp->ifname);
ioctl(sock_fd, SIOCSIFFLAGS, &ifr);
if (ppp->ses.ipv4) {
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
memcpy(&ifr.ifr_addr,&addr,sizeof(addr));
ioctl(sock_fd, SIOCSIFADDR, &ifr);
}
if (ppp->ses.ipv6) {
memset(&ifr6, 0, sizeof(ifr6));
ifr6.ifr6_addr.s6_addr32[0] = htons(0xfe80);
*(uint64_t *)(ifr6.ifr6_addr.s6_addr + 8) = ppp->ses.ipv6->intf_id;
ifr6.ifr6_prefixlen = 64;
ifr6.ifr6_ifindex = ppp->ifindex;
ioctl(sock6_fd, SIOCDIFADDR, &ifr6);
list_for_each_entry(a, &ppp->ses.ipv6->addr_list, entry) {
if (a->prefix_len == 128)
continue;
build_addr(a, ppp->ses.ipv6->intf_id, &ifr6.ifr6_addr);
ifr6.ifr6_prefixlen = a->prefix_len;
ioctl(sock6_fd, SIOCDIFADDR, &ifr6);
}
}
}
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