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-rw-r--r--lib/sockopt.c695
1 files changed, 695 insertions, 0 deletions
diff --git a/lib/sockopt.c b/lib/sockopt.c
new file mode 100644
index 0000000..7a2b8a1
--- /dev/null
+++ b/lib/sockopt.c
@@ -0,0 +1,695 @@
+/* setsockopt functions
+ * Copyright (C) 1999 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "sockopt.h"
+#include "sockunion.h"
+#include "lib_errors.h"
+
+#if (defined(__FreeBSD__) \
+ && ((__FreeBSD_version >= 500022 && __FreeBSD_version < 700000) \
+ || (__FreeBSD_version < 500000 && __FreeBSD_version >= 440000))) \
+ || (defined(__NetBSD__) && defined(__NetBSD_Version__) \
+ && __NetBSD_Version__ >= 106010000) \
+ || defined(__OpenBSD__) || defined(__APPLE__) \
+ || defined(__DragonFly__) || defined(__sun)
+#define HAVE_BSD_STRUCT_IP_MREQ_HACK
+#endif
+
+void setsockopt_so_recvbuf(int sock, int size)
+{
+ int orig_req = size;
+
+ while (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size))
+ == -1)
+ size /= 2;
+
+ if (size != orig_req)
+ flog_err(EC_LIB_SOCKET,
+ "%s: fd %d: SO_RCVBUF set to %d (requested %d)",
+ __func__, sock, size, orig_req);
+}
+
+void setsockopt_so_sendbuf(const int sock, int size)
+{
+ int orig_req = size;
+
+ while (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size))
+ == -1)
+ size /= 2;
+
+ if (size != orig_req)
+ flog_err(EC_LIB_SOCKET,
+ "%s: fd %d: SO_SNDBUF set to %d (requested %d)",
+ __func__, sock, size, orig_req);
+}
+
+int getsockopt_so_sendbuf(const int sock)
+{
+ uint32_t optval;
+ socklen_t optlen = sizeof(optval);
+ int ret = getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&optval,
+ &optlen);
+ if (ret < 0) {
+ flog_err_sys(EC_LIB_SYSTEM_CALL,
+ "fd %d: can't getsockopt SO_SNDBUF: %d (%s)", sock,
+ errno, safe_strerror(errno));
+ return ret;
+ }
+ return optval;
+}
+
+int getsockopt_so_recvbuf(const int sock)
+{
+ uint32_t optval;
+ socklen_t optlen = sizeof(optval);
+ int ret = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&optval,
+ &optlen);
+ if (ret < 0) {
+ flog_err_sys(EC_LIB_SYSTEM_CALL,
+ "fd %d: can't getsockopt SO_RCVBUF: %d (%s)", sock,
+ errno, safe_strerror(errno));
+ return ret;
+ }
+ return optval;
+}
+
+static void *getsockopt_cmsg_data(struct msghdr *msgh, int level, int type)
+{
+ struct cmsghdr *cmsg;
+
+ for (cmsg = CMSG_FIRSTHDR(msgh); cmsg != NULL;
+ cmsg = CMSG_NXTHDR(msgh, cmsg))
+ if (cmsg->cmsg_level == level && cmsg->cmsg_type == type)
+ return CMSG_DATA(cmsg);
+
+ return NULL;
+}
+
+/* Set IPv6 packet info to the socket. */
+int setsockopt_ipv6_pktinfo(int sock, int val)
+{
+ int ret;
+
+#ifdef IPV6_RECVPKTINFO /*2292bis-01*/
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val,
+ sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET,
+ "can't setsockopt IPV6_RECVPKTINFO : %s",
+ safe_strerror(errno));
+#else /*RFC2292*/
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &val, sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET, "can't setsockopt IPV6_PKTINFO : %s",
+ safe_strerror(errno));
+#endif /* IANA_IPV6 */
+ return ret;
+}
+
+/* Set multicast hops val to the socket. */
+int setsockopt_ipv6_multicast_hops(int sock, int val)
+{
+ int ret;
+
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val,
+ sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET, "can't setsockopt IPV6_MULTICAST_HOPS");
+ return ret;
+}
+
+/* Set multicast hops val to the socket. */
+int setsockopt_ipv6_unicast_hops(int sock, int val)
+{
+ int ret;
+
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &val,
+ sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET, "can't setsockopt IPV6_UNICAST_HOPS");
+ return ret;
+}
+
+int setsockopt_ipv6_hoplimit(int sock, int val)
+{
+ int ret;
+
+#ifdef IPV6_RECVHOPLIMIT /*2292bis-01*/
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &val,
+ sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET, "can't setsockopt IPV6_RECVHOPLIMIT");
+#else /*RFC2292*/
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &val, sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET, "can't setsockopt IPV6_HOPLIMIT");
+#endif
+ return ret;
+}
+
+/* Set multicast loop zero to the socket. */
+int setsockopt_ipv6_multicast_loop(int sock, int val)
+{
+ int ret;
+
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val,
+ sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET, "can't setsockopt IPV6_MULTICAST_LOOP");
+ return ret;
+}
+
+static int getsockopt_ipv6_ifindex(struct msghdr *msgh)
+{
+ struct in6_pktinfo *pktinfo;
+
+ pktinfo = getsockopt_cmsg_data(msgh, IPPROTO_IPV6, IPV6_PKTINFO);
+
+ return pktinfo->ipi6_ifindex;
+}
+
+int setsockopt_ipv6_tclass(int sock, int tclass)
+{
+ int ret = 0;
+
+#ifdef IPV6_TCLASS /* RFC3542 */
+ ret = setsockopt(sock, IPPROTO_IPV6, IPV6_TCLASS, &tclass,
+ sizeof(tclass));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET,
+ "Can't set IPV6_TCLASS option for fd %d to %#x: %s",
+ sock, tclass, safe_strerror(errno));
+#endif
+ return ret;
+}
+
+/*
+ * Process multicast socket options for IPv4 in an OS-dependent manner.
+ * Supported options are IP_{ADD,DROP}_MEMBERSHIP.
+ *
+ * Many operating systems have a limit on the number of groups that
+ * can be joined per socket (where each group and local address
+ * counts). This impacts OSPF, which joins groups on each interface
+ * using a single socket. The limit is typically 20, derived from the
+ * original BSD multicast implementation. Some systems have
+ * mechanisms for increasing this limit.
+ *
+ * In many 4.4BSD-derived systems, multicast group operations are not
+ * allowed on interfaces that are not UP. Thus, a previous attempt to
+ * leave the group may have failed, leaving it still joined, and we
+ * drop/join quietly to recover. This may not be necessary, but aims to
+ * defend against unknown behavior in that we will still return an error
+ * if the second join fails. It is not clear how other systems
+ * (e.g. Linux, Solaris) behave when leaving groups on down interfaces,
+ * but this behavior should not be harmful if they behave the same way,
+ * allow leaves, or implicitly leave all groups joined to down interfaces.
+ */
+int setsockopt_ipv4_multicast(int sock, int optname, struct in_addr if_addr,
+ unsigned int mcast_addr, ifindex_t ifindex)
+{
+#ifdef HAVE_RFC3678
+ struct group_req gr;
+ struct sockaddr_in *si;
+ int ret;
+ memset(&gr, 0, sizeof(gr));
+ si = (struct sockaddr_in *)&gr.gr_group;
+ gr.gr_interface = ifindex;
+ si->sin_family = AF_INET;
+#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
+ si->sin_len = sizeof(struct sockaddr_in);
+#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
+ si->sin_addr.s_addr = mcast_addr;
+ ret = setsockopt(sock, IPPROTO_IP,
+ (optname == IP_ADD_MEMBERSHIP) ? MCAST_JOIN_GROUP
+ : MCAST_LEAVE_GROUP,
+ (void *)&gr, sizeof(gr));
+ if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP)
+ && (errno == EADDRINUSE)) {
+ setsockopt(sock, IPPROTO_IP, MCAST_LEAVE_GROUP, (void *)&gr,
+ sizeof(gr));
+ ret = setsockopt(sock, IPPROTO_IP, MCAST_JOIN_GROUP,
+ (void *)&gr, sizeof(gr));
+ }
+ return ret;
+
+#elif defined(HAVE_STRUCT_IP_MREQN_IMR_IFINDEX) && !defined(__FreeBSD__)
+ struct ip_mreqn mreqn;
+ int ret;
+
+ assert(optname == IP_ADD_MEMBERSHIP || optname == IP_DROP_MEMBERSHIP);
+ memset(&mreqn, 0, sizeof(mreqn));
+
+ mreqn.imr_multiaddr.s_addr = mcast_addr;
+ mreqn.imr_ifindex = ifindex;
+
+ ret = setsockopt(sock, IPPROTO_IP, optname, (void *)&mreqn,
+ sizeof(mreqn));
+ if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP)
+ && (errno == EADDRINUSE)) {
+ /* see above: handle possible problem when interface comes back
+ * up */
+ zlog_info(
+ "setsockopt_ipv4_multicast attempting to drop and re-add (fd %d, mcast %pI4, ifindex %u)",
+ sock, &mreqn.imr_multiaddr, ifindex);
+ setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP, (void *)&mreqn,
+ sizeof(mreqn));
+ ret = setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
+ (void *)&mreqn, sizeof(mreqn));
+ }
+ return ret;
+
+/* Example defines for another OS, boilerplate off other code in this
+ function, AND handle optname as per other sections for consistency !! */
+/* #elif defined(BOGON_NIX) && EXAMPLE_VERSION_CODE > -100000 */
+/* Add your favourite OS here! */
+
+#elif defined(HAVE_BSD_STRUCT_IP_MREQ_HACK) /* #if OS_TYPE */
+ /* standard BSD API */
+
+ struct ip_mreq mreq;
+ int ret;
+
+ assert(optname == IP_ADD_MEMBERSHIP || optname == IP_DROP_MEMBERSHIP);
+
+
+ memset(&mreq, 0, sizeof(mreq));
+ mreq.imr_multiaddr.s_addr = mcast_addr;
+#if !defined __OpenBSD__
+ mreq.imr_interface.s_addr = htonl(ifindex);
+#else
+ mreq.imr_interface.s_addr = if_addr.s_addr;
+#endif
+
+ ret = setsockopt(sock, IPPROTO_IP, optname, (void *)&mreq,
+ sizeof(mreq));
+ if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP)
+ && (errno == EADDRINUSE)) {
+ /* see above: handle possible problem when interface comes back
+ * up */
+ zlog_info(
+ "setsockopt_ipv4_multicast attempting to drop and re-add (fd %d, mcast %pI4, ifindex %u)",
+ sock, &mreq.imr_multiaddr, ifindex);
+ setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP, (void *)&mreq,
+ sizeof(mreq));
+ ret = setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
+ (void *)&mreq, sizeof(mreq));
+ }
+ return ret;
+
+#else
+#error "Unsupported multicast API"
+#endif /* #if OS_TYPE */
+}
+
+/*
+ * Set IP_MULTICAST_IF socket option in an OS-dependent manner.
+ */
+int setsockopt_ipv4_multicast_if(int sock, struct in_addr if_addr,
+ ifindex_t ifindex)
+{
+
+#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
+ struct ip_mreqn mreqn;
+ memset(&mreqn, 0, sizeof(mreqn));
+
+ mreqn.imr_ifindex = ifindex;
+ return setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, (void *)&mreqn,
+ sizeof(mreqn));
+
+/* Example defines for another OS, boilerplate off other code in this
+ function */
+/* #elif defined(BOGON_NIX) && EXAMPLE_VERSION_CODE > -100000 */
+/* Add your favourite OS here! */
+#elif defined(HAVE_BSD_STRUCT_IP_MREQ_HACK)
+ struct in_addr m;
+
+#if !defined __OpenBSD__
+ m.s_addr = htonl(ifindex);
+#else
+ m.s_addr = if_addr.s_addr;
+#endif
+
+ return setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, (void *)&m,
+ sizeof(m));
+#else
+#error "Unsupported multicast API"
+#endif
+}
+
+int setsockopt_ipv4_multicast_loop(int sock, uint8_t val)
+{
+ int ret;
+
+ ret = setsockopt(sock, IPPROTO_IP, IP_MULTICAST_LOOP, (void *)&val,
+ sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET, "can't setsockopt IP_MULTICAST_LOOP");
+
+ return ret;
+}
+
+static int setsockopt_ipv4_ifindex(int sock, ifindex_t val)
+{
+ int ret;
+
+#if defined(IP_PKTINFO)
+ ret = setsockopt(sock, IPPROTO_IP, IP_PKTINFO, &val, sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET,
+ "Can't set IP_PKTINFO option for fd %d to %d: %s",
+ sock, val, safe_strerror(errno));
+#elif defined(IP_RECVIF)
+ ret = setsockopt(sock, IPPROTO_IP, IP_RECVIF, &val, sizeof(val));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET,
+ "Can't set IP_RECVIF option for fd %d to %d: %s", sock,
+ val, safe_strerror(errno));
+#else
+#warning "Neither IP_PKTINFO nor IP_RECVIF is available."
+#warning "Will not be able to receive link info."
+#warning "Things might be seriously broken.."
+ /* XXX Does this ever happen? Should there be a zlog_warn message here?
+ */
+ ret = -1;
+#endif
+ return ret;
+}
+
+int setsockopt_ipv4_tos(int sock, int tos)
+{
+ int ret;
+
+ ret = setsockopt(sock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
+ if (ret < 0)
+ flog_err(EC_LIB_SOCKET,
+ "Can't set IP_TOS option for fd %d to %#x: %s", sock,
+ tos, safe_strerror(errno));
+ return ret;
+}
+
+
+int setsockopt_ifindex(int af, int sock, ifindex_t val)
+{
+ int ret = -1;
+
+ switch (af) {
+ case AF_INET:
+ ret = setsockopt_ipv4_ifindex(sock, val);
+ break;
+ case AF_INET6:
+ ret = setsockopt_ipv6_pktinfo(sock, val);
+ break;
+ default:
+ flog_err(EC_LIB_DEVELOPMENT,
+ "setsockopt_ifindex: unknown address family %d", af);
+ }
+ return ret;
+}
+
+/*
+ * Requires: msgh is not NULL and points to a valid struct msghdr, which
+ * may or may not have control data about the incoming interface.
+ *
+ * Returns the interface index (small integer >= 1) if it can be
+ * determined, or else 0.
+ */
+static ifindex_t getsockopt_ipv4_ifindex(struct msghdr *msgh)
+{
+ ifindex_t ifindex;
+
+#if defined(IP_PKTINFO)
+ /* Linux pktinfo based ifindex retrieval */
+ struct in_pktinfo *pktinfo;
+
+ pktinfo = (struct in_pktinfo *)getsockopt_cmsg_data(msgh, IPPROTO_IP,
+ IP_PKTINFO);
+
+ /* getsockopt_ifindex() will forward this, being 0 "not found" */
+ if (pktinfo == NULL)
+ return 0;
+
+ ifindex = pktinfo->ipi_ifindex;
+
+#elif defined(IP_RECVIF)
+
+/* retrieval based on IP_RECVIF */
+
+ /* BSD systems use a sockaddr_dl as the control message payload. */
+ struct sockaddr_dl *sdl;
+
+ /* BSD */
+ sdl = (struct sockaddr_dl *)getsockopt_cmsg_data(msgh, IPPROTO_IP,
+ IP_RECVIF);
+ if (sdl != NULL)
+ ifindex = sdl->sdl_index;
+ else
+ ifindex = 0;
+
+#else
+/*
+ * Neither IP_PKTINFO nor IP_RECVIF defined - warn at compile time.
+ * XXX Decide if this is a core service, or if daemons have to cope.
+ * Since Solaris 8 and OpenBSD seem not to provide it, it seems that
+ * daemons have to cope.
+ */
+#warning "getsockopt_ipv4_ifindex: Neither IP_PKTINFO nor IP_RECVIF defined."
+#warning "Some daemons may fail to operate correctly!"
+ ifindex = 0;
+
+#endif /* IP_PKTINFO */
+
+ return ifindex;
+}
+
+/* return ifindex, 0 if none found */
+ifindex_t getsockopt_ifindex(int af, struct msghdr *msgh)
+{
+ switch (af) {
+ case AF_INET:
+ return (getsockopt_ipv4_ifindex(msgh));
+ case AF_INET6:
+ return (getsockopt_ipv6_ifindex(msgh));
+ default:
+ flog_err(EC_LIB_DEVELOPMENT,
+ "getsockopt_ifindex: unknown address family %d", af);
+ return 0;
+ }
+}
+
+/* swab iph between order system uses for IP_HDRINCL and host order */
+void sockopt_iphdrincl_swab_htosys(struct ip *iph)
+{
+/* BSD and derived take iph in network order, except for
+ * ip_len and ip_off
+ */
+#ifndef HAVE_IP_HDRINCL_BSD_ORDER
+ iph->ip_len = htons(iph->ip_len);
+ iph->ip_off = htons(iph->ip_off);
+#endif /* HAVE_IP_HDRINCL_BSD_ORDER */
+
+ iph->ip_id = htons(iph->ip_id);
+}
+
+void sockopt_iphdrincl_swab_systoh(struct ip *iph)
+{
+#ifndef HAVE_IP_HDRINCL_BSD_ORDER
+ iph->ip_len = ntohs(iph->ip_len);
+ iph->ip_off = ntohs(iph->ip_off);
+#endif /* HAVE_IP_HDRINCL_BSD_ORDER */
+
+ iph->ip_id = ntohs(iph->ip_id);
+}
+
+int sockopt_tcp_rtt(int sock)
+{
+#ifdef TCP_INFO
+ struct tcp_info ti;
+ socklen_t len = sizeof(ti);
+
+ if (getsockopt(sock, IPPROTO_TCP, TCP_INFO, &ti, &len) != 0)
+ return 0;
+
+ return ti.tcpi_rtt / 1000;
+#else
+ return 0;
+#endif
+}
+
+int sockopt_tcp_signature_ext(int sock, union sockunion *su, uint16_t prefixlen,
+ const char *password)
+{
+#ifndef HAVE_DECL_TCP_MD5SIG
+ /*
+ * We have been asked to enable MD5 auth for an address, but our
+ * platform doesn't support that
+ */
+ return -2;
+#endif
+
+#ifndef TCP_MD5SIG_EXT
+ /*
+ * We have been asked to enable MD5 auth for a prefix, but our platform
+ * doesn't support that
+ */
+ if (prefixlen > 0)
+ return -2;
+#endif
+
+#if HAVE_DECL_TCP_MD5SIG
+ int ret;
+
+ int optname = TCP_MD5SIG;
+#ifndef GNU_LINUX
+ /*
+ * XXX Need to do PF_KEY operation here to add/remove an SA entry,
+ * and add/remove an SP entry for this peer's packet flows also.
+ */
+ int md5sig = password && *password ? 1 : 0;
+#else
+ int keylen = password ? strlen(password) : 0;
+ struct tcp_md5sig md5sig;
+ union sockunion *su2, *susock;
+
+ /* Figure out whether the socket and the sockunion are the same family..
+ * adding AF_INET to AF_INET6 needs to be v4 mapped, you'd think..
+ */
+ if (!(susock = sockunion_getsockname(sock)))
+ return -1;
+
+ if (susock->sa.sa_family == su->sa.sa_family)
+ su2 = su;
+ else {
+ /* oops.. */
+ su2 = susock;
+
+ if (su2->sa.sa_family == AF_INET) {
+ sockunion_free(susock);
+ return 0;
+ }
+
+ /* If this does not work, then all users of this sockopt will
+ * need to
+ * differentiate between IPv4 and IPv6, and keep separate
+ * sockets for
+ * each.
+ *
+ * Sadly, it doesn't seem to work at present. It's unknown
+ * whether
+ * this is a bug or not.
+ */
+ if (su2->sa.sa_family == AF_INET6
+ && su->sa.sa_family == AF_INET) {
+ su2->sin6.sin6_family = AF_INET6;
+ /* V4Map the address */
+ memset(&su2->sin6.sin6_addr, 0,
+ sizeof(struct in6_addr));
+ su2->sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
+ memcpy(&su2->sin6.sin6_addr.s6_addr32[3],
+ &su->sin.sin_addr, 4);
+ }
+ }
+
+ memset(&md5sig, 0, sizeof(md5sig));
+ memcpy(&md5sig.tcpm_addr, su2, sizeof(*su2));
+
+ md5sig.tcpm_keylen = keylen;
+ if (keylen)
+ memcpy(md5sig.tcpm_key, password, keylen);
+ sockunion_free(susock);
+
+ /*
+ * Handle support for MD5 signatures on prefixes, if available and
+ * requested. Technically the #ifdef check below is not needed because
+ * if prefixlen > 0 and we don't have support for this feature we would
+ * have already returned by now, but leaving it there to be explicit.
+ */
+#ifdef TCP_MD5SIG_EXT
+ if (prefixlen > 0) {
+ md5sig.tcpm_prefixlen = prefixlen;
+ md5sig.tcpm_flags = TCP_MD5SIG_FLAG_PREFIX;
+ optname = TCP_MD5SIG_EXT;
+ }
+#endif /* TCP_MD5SIG_EXT */
+
+#endif /* GNU_LINUX */
+
+ ret = setsockopt(sock, IPPROTO_TCP, optname, &md5sig, sizeof(md5sig));
+ if (ret < 0) {
+ if (ENOENT == errno)
+ ret = 0;
+ else
+ flog_err_sys(
+ EC_LIB_SYSTEM_CALL,
+ "sockopt_tcp_signature: setsockopt(%d): %s",
+ sock, safe_strerror(errno));
+ }
+ return ret;
+#endif /* HAVE_TCP_MD5SIG */
+
+ /*
+ * Making compiler happy. If we get to this point we probably
+ * have done something really really wrong.
+ */
+ return -2;
+}
+
+int sockopt_tcp_signature(int sock, union sockunion *su, const char *password)
+{
+ return sockopt_tcp_signature_ext(sock, su, 0, password);
+}
+
+/* set TCP mss value to socket */
+int sockopt_tcp_mss_set(int sock, int tcp_maxseg)
+{
+ int ret = 0;
+ socklen_t tcp_maxseg_len = sizeof(tcp_maxseg);
+
+ ret = setsockopt(sock, IPPROTO_TCP, TCP_MAXSEG, &tcp_maxseg,
+ tcp_maxseg_len);
+ if (ret != 0) {
+ flog_err_sys(EC_LIB_SYSTEM_CALL,
+ "%s failed: setsockopt(%d): %s", __func__, sock,
+ safe_strerror(errno));
+ }
+
+ return ret;
+}
+
+/* get TCP mss value synced by socket */
+int sockopt_tcp_mss_get(int sock)
+{
+ int ret = 0;
+ int tcp_maxseg = 0;
+ socklen_t tcp_maxseg_len = sizeof(tcp_maxseg);
+
+ ret = getsockopt(sock, IPPROTO_TCP, TCP_MAXSEG, &tcp_maxseg,
+ &tcp_maxseg_len);
+ if (ret != 0) {
+ flog_err_sys(EC_LIB_SYSTEM_CALL,
+ "%s failed: getsockopt(%d): %s", __func__, sock,
+ safe_strerror(errno));
+ return 0;
+ }
+
+ return tcp_maxseg;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 12:07:14 +0000