From 2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:53:30 +0200 Subject: Adding upstream version 8.4.4. Signed-off-by: Daniel Baumann --- nhrpd/linux.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) create mode 100644 nhrpd/linux.c (limited to 'nhrpd/linux.c') diff --git a/nhrpd/linux.c b/nhrpd/linux.c new file mode 100644 index 0000000..75e9f37 --- /dev/null +++ b/nhrpd/linux.c @@ -0,0 +1,152 @@ +/* NHRP daemon Linux specific glue + * Copyright (c) 2014-2015 Timo Teräs + * + * This file is free software: you may copy, redistribute and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + */ + +#include "zebra.h" + +#include +#include + +#include "nhrp_protocol.h" +#include "os.h" + +#ifndef HAVE_STRLCPY +size_t strlcpy(char *__restrict dest, + const char *__restrict src, size_t destsize); +#endif + +static int nhrp_socket_fd = -1; + +int os_socket(void) +{ + if (nhrp_socket_fd < 0) + nhrp_socket_fd = + socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_NHRP)); + return nhrp_socket_fd; +} + +int os_sendmsg(const uint8_t *buf, size_t len, int ifindex, const uint8_t *addr, + size_t addrlen, uint16_t protocol) +{ + struct sockaddr_ll lladdr; + struct iovec iov = { + .iov_base = (void *)buf, .iov_len = len, + }; + struct msghdr msg = { + .msg_name = &lladdr, + .msg_namelen = sizeof(lladdr), + .msg_iov = &iov, + .msg_iovlen = 1, + }; + int status, fd; + + if (addrlen > sizeof(lladdr.sll_addr)) + return -1; + + memset(&lladdr, 0, sizeof(lladdr)); + lladdr.sll_family = AF_PACKET; + lladdr.sll_protocol = htons(protocol); + lladdr.sll_ifindex = ifindex; + lladdr.sll_halen = addrlen; + memcpy(lladdr.sll_addr, addr, addrlen); + + fd = os_socket(); + if (fd < 0) + return -1; + + status = sendmsg(fd, &msg, 0); + if (status < 0) + return -errno; + + return status; +} + +int os_recvmsg(uint8_t *buf, size_t *len, int *ifindex, uint8_t *addr, + size_t *addrlen) +{ + struct sockaddr_ll lladdr; + struct iovec iov = { + .iov_base = buf, .iov_len = *len, + }; + struct msghdr msg = { + .msg_name = &lladdr, + .msg_namelen = sizeof(lladdr), + .msg_iov = &iov, + .msg_iovlen = 1, + }; + int r; + + r = recvmsg(nhrp_socket_fd, &msg, MSG_DONTWAIT); + if (r < 0) + return r; + + *len = r; + *ifindex = lladdr.sll_ifindex; + + if (*addrlen <= (size_t)lladdr.sll_addr) { + if (memcmp(lladdr.sll_addr, "\x00\x00\x00\x00", 4) != 0) { + memcpy(addr, lladdr.sll_addr, lladdr.sll_halen); + *addrlen = lladdr.sll_halen; + } else { + *addrlen = 0; + } + } + + return 0; +} + +static int linux_configure_arp(const char *iface, int on) +{ + struct ifreq ifr; + + strlcpy(ifr.ifr_name, iface, IFNAMSIZ); + if (ioctl(nhrp_socket_fd, SIOCGIFFLAGS, &ifr)) + return -1; + + if (on) + ifr.ifr_flags &= ~IFF_NOARP; + else + ifr.ifr_flags |= IFF_NOARP; + + if (ioctl(nhrp_socket_fd, SIOCSIFFLAGS, &ifr)) + return -1; + + return 0; +} + +static int linux_icmp_redirect_off(const char *iface) +{ + char fname[PATH_MAX]; + int fd, ret = -1; + + snprintf(fname, sizeof(fname), + "/proc/sys/net/ipv4/conf/%s/send_redirects", iface); + fd = open(fname, O_WRONLY); + if (fd < 0) + return -1; + if (write(fd, "0\n", 2) == 2) + ret = 0; + close(fd); + + return ret; +} + +int os_configure_dmvpn(unsigned int ifindex, const char *ifname, int af) +{ + int ret = 0; + + switch (af) { + case AF_INET: + ret |= linux_icmp_redirect_off("all"); + ret |= linux_icmp_redirect_off(ifname); + break; + } + ret |= linux_configure_arp(ifname, 1); + + return ret; +} -- cgit v1.2.3