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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/ipv4/ip_sockglue.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c1832
1 files changed, 1832 insertions, 0 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
new file mode 100644
index 000000000..c1fb7580e
--- /dev/null
+++ b/net/ipv4/ip_sockglue.c
@@ -0,0 +1,1832 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * The IP to API glue.
+ *
+ * Authors: see ip.c
+ *
+ * Fixes:
+ * Many : Split from ip.c , see ip.c for history.
+ * Martin Mares : TOS setting fixed.
+ * Alan Cox : Fixed a couple of oopses in Martin's
+ * TOS tweaks.
+ * Mike McLagan : Routing by source
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/icmp.h>
+#include <linux/inetdevice.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/tcp_states.h>
+#include <linux/udp.h>
+#include <linux/igmp.h>
+#include <linux/netfilter.h>
+#include <linux/route.h>
+#include <linux/mroute.h>
+#include <net/inet_ecn.h>
+#include <net/route.h>
+#include <net/xfrm.h>
+#include <net/compat.h>
+#include <net/checksum.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/transp_v6.h>
+#endif
+#include <net/ip_fib.h>
+
+#include <linux/errqueue.h>
+#include <linux/uaccess.h>
+
+#include <linux/bpfilter.h>
+
+/*
+ * SOL_IP control messages.
+ */
+
+static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
+{
+ struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
+
+ info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
+
+ put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
+}
+
+static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
+{
+ int ttl = ip_hdr(skb)->ttl;
+ put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
+}
+
+static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
+{
+ put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
+}
+
+static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
+{
+ if (IPCB(skb)->opt.optlen == 0)
+ return;
+
+ put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
+ ip_hdr(skb) + 1);
+}
+
+
+static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
+ struct sk_buff *skb)
+{
+ unsigned char optbuf[sizeof(struct ip_options) + 40];
+ struct ip_options *opt = (struct ip_options *)optbuf;
+
+ if (IPCB(skb)->opt.optlen == 0)
+ return;
+
+ if (ip_options_echo(net, opt, skb)) {
+ msg->msg_flags |= MSG_CTRUNC;
+ return;
+ }
+ ip_options_undo(opt);
+
+ put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
+}
+
+static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
+{
+ int val;
+
+ if (IPCB(skb)->frag_max_size == 0)
+ return;
+
+ val = IPCB(skb)->frag_max_size;
+ put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
+}
+
+static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
+ int tlen, int offset)
+{
+ __wsum csum = skb->csum;
+
+ if (skb->ip_summed != CHECKSUM_COMPLETE)
+ return;
+
+ if (offset != 0) {
+ int tend_off = skb_transport_offset(skb) + tlen;
+ csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
+ }
+
+ put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
+}
+
+static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
+{
+ char *secdata;
+ u32 seclen, secid;
+ int err;
+
+ err = security_socket_getpeersec_dgram(NULL, skb, &secid);
+ if (err)
+ return;
+
+ err = security_secid_to_secctx(secid, &secdata, &seclen);
+ if (err)
+ return;
+
+ put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
+ security_release_secctx(secdata, seclen);
+}
+
+static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
+{
+ __be16 _ports[2], *ports;
+ struct sockaddr_in sin;
+
+ /* All current transport protocols have the port numbers in the
+ * first four bytes of the transport header and this function is
+ * written with this assumption in mind.
+ */
+ ports = skb_header_pointer(skb, skb_transport_offset(skb),
+ sizeof(_ports), &_ports);
+ if (!ports)
+ return;
+
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
+ sin.sin_port = ports[1];
+ memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
+
+ put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
+}
+
+void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
+ struct sk_buff *skb, int tlen, int offset)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ unsigned int flags = inet->cmsg_flags;
+
+ /* Ordered by supposed usage frequency */
+ if (flags & IP_CMSG_PKTINFO) {
+ ip_cmsg_recv_pktinfo(msg, skb);
+
+ flags &= ~IP_CMSG_PKTINFO;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_TTL) {
+ ip_cmsg_recv_ttl(msg, skb);
+
+ flags &= ~IP_CMSG_TTL;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_TOS) {
+ ip_cmsg_recv_tos(msg, skb);
+
+ flags &= ~IP_CMSG_TOS;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_RECVOPTS) {
+ ip_cmsg_recv_opts(msg, skb);
+
+ flags &= ~IP_CMSG_RECVOPTS;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_RETOPTS) {
+ ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
+
+ flags &= ~IP_CMSG_RETOPTS;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_PASSSEC) {
+ ip_cmsg_recv_security(msg, skb);
+
+ flags &= ~IP_CMSG_PASSSEC;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_ORIGDSTADDR) {
+ ip_cmsg_recv_dstaddr(msg, skb);
+
+ flags &= ~IP_CMSG_ORIGDSTADDR;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_CHECKSUM)
+ ip_cmsg_recv_checksum(msg, skb, tlen, offset);
+
+ if (flags & IP_CMSG_RECVFRAGSIZE)
+ ip_cmsg_recv_fragsize(msg, skb);
+}
+EXPORT_SYMBOL(ip_cmsg_recv_offset);
+
+int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
+ bool allow_ipv6)
+{
+ int err, val;
+ struct cmsghdr *cmsg;
+ struct net *net = sock_net(sk);
+
+ for_each_cmsghdr(cmsg, msg) {
+ if (!CMSG_OK(msg, cmsg))
+ return -EINVAL;
+#if IS_ENABLED(CONFIG_IPV6)
+ if (allow_ipv6 &&
+ cmsg->cmsg_level == SOL_IPV6 &&
+ cmsg->cmsg_type == IPV6_PKTINFO) {
+ struct in6_pktinfo *src_info;
+
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
+ return -EINVAL;
+ src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
+ if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
+ return -EINVAL;
+ if (src_info->ipi6_ifindex)
+ ipc->oif = src_info->ipi6_ifindex;
+ ipc->addr = src_info->ipi6_addr.s6_addr32[3];
+ continue;
+ }
+#endif
+ if (cmsg->cmsg_level == SOL_SOCKET) {
+ err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
+ if (err)
+ return err;
+ continue;
+ }
+
+ if (cmsg->cmsg_level != SOL_IP)
+ continue;
+ switch (cmsg->cmsg_type) {
+ case IP_RETOPTS:
+ err = cmsg->cmsg_len - sizeof(struct cmsghdr);
+
+ /* Our caller is responsible for freeing ipc->opt */
+ err = ip_options_get(net, &ipc->opt,
+ KERNEL_SOCKPTR(CMSG_DATA(cmsg)),
+ err < 40 ? err : 40);
+ if (err)
+ return err;
+ break;
+ case IP_PKTINFO:
+ {
+ struct in_pktinfo *info;
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
+ return -EINVAL;
+ info = (struct in_pktinfo *)CMSG_DATA(cmsg);
+ if (info->ipi_ifindex)
+ ipc->oif = info->ipi_ifindex;
+ ipc->addr = info->ipi_spec_dst.s_addr;
+ break;
+ }
+ case IP_TTL:
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
+ return -EINVAL;
+ val = *(int *)CMSG_DATA(cmsg);
+ if (val < 1 || val > 255)
+ return -EINVAL;
+ ipc->ttl = val;
+ break;
+ case IP_TOS:
+ if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
+ val = *(int *)CMSG_DATA(cmsg);
+ else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
+ val = *(u8 *)CMSG_DATA(cmsg);
+ else
+ return -EINVAL;
+ if (val < 0 || val > 255)
+ return -EINVAL;
+ ipc->tos = val;
+ ipc->priority = rt_tos2priority(ipc->tos);
+ break;
+ case IP_PROTOCOL:
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
+ return -EINVAL;
+ val = *(int *)CMSG_DATA(cmsg);
+ if (val < 1 || val > 255)
+ return -EINVAL;
+ ipc->protocol = val;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static void ip_ra_destroy_rcu(struct rcu_head *head)
+{
+ struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
+
+ sock_put(ra->saved_sk);
+ kfree(ra);
+}
+
+int ip_ra_control(struct sock *sk, unsigned char on,
+ void (*destructor)(struct sock *))
+{
+ struct ip_ra_chain *ra, *new_ra;
+ struct ip_ra_chain __rcu **rap;
+ struct net *net = sock_net(sk);
+
+ if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
+ return -EINVAL;
+
+ new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
+ if (on && !new_ra)
+ return -ENOMEM;
+
+ mutex_lock(&net->ipv4.ra_mutex);
+ for (rap = &net->ipv4.ra_chain;
+ (ra = rcu_dereference_protected(*rap,
+ lockdep_is_held(&net->ipv4.ra_mutex))) != NULL;
+ rap = &ra->next) {
+ if (ra->sk == sk) {
+ if (on) {
+ mutex_unlock(&net->ipv4.ra_mutex);
+ kfree(new_ra);
+ return -EADDRINUSE;
+ }
+ /* dont let ip_call_ra_chain() use sk again */
+ ra->sk = NULL;
+ RCU_INIT_POINTER(*rap, ra->next);
+ mutex_unlock(&net->ipv4.ra_mutex);
+
+ if (ra->destructor)
+ ra->destructor(sk);
+ /*
+ * Delay sock_put(sk) and kfree(ra) after one rcu grace
+ * period. This guarantee ip_call_ra_chain() dont need
+ * to mess with socket refcounts.
+ */
+ ra->saved_sk = sk;
+ call_rcu(&ra->rcu, ip_ra_destroy_rcu);
+ return 0;
+ }
+ }
+ if (!new_ra) {
+ mutex_unlock(&net->ipv4.ra_mutex);
+ return -ENOBUFS;
+ }
+ new_ra->sk = sk;
+ new_ra->destructor = destructor;
+
+ RCU_INIT_POINTER(new_ra->next, ra);
+ rcu_assign_pointer(*rap, new_ra);
+ sock_hold(sk);
+ mutex_unlock(&net->ipv4.ra_mutex);
+
+ return 0;
+}
+
+static void ipv4_icmp_error_rfc4884(const struct sk_buff *skb,
+ struct sock_ee_data_rfc4884 *out)
+{
+ switch (icmp_hdr(skb)->type) {
+ case ICMP_DEST_UNREACH:
+ case ICMP_TIME_EXCEEDED:
+ case ICMP_PARAMETERPROB:
+ ip_icmp_error_rfc4884(skb, out, sizeof(struct icmphdr),
+ icmp_hdr(skb)->un.reserved[1] * 4);
+ }
+}
+
+void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
+ __be16 port, u32 info, u8 *payload)
+{
+ struct sock_exterr_skb *serr;
+
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ serr = SKB_EXT_ERR(skb);
+ serr->ee.ee_errno = err;
+ serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
+ serr->ee.ee_type = icmp_hdr(skb)->type;
+ serr->ee.ee_code = icmp_hdr(skb)->code;
+ serr->ee.ee_pad = 0;
+ serr->ee.ee_info = info;
+ serr->ee.ee_data = 0;
+ serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
+ skb_network_header(skb);
+ serr->port = port;
+
+ if (skb_pull(skb, payload - skb->data)) {
+ if (inet_sk(sk)->recverr_rfc4884)
+ ipv4_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
+
+ skb_reset_transport_header(skb);
+ if (sock_queue_err_skb(sk, skb) == 0)
+ return;
+ }
+ kfree_skb(skb);
+}
+
+void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct sock_exterr_skb *serr;
+ struct iphdr *iph;
+ struct sk_buff *skb;
+
+ if (!inet->recverr)
+ return;
+
+ skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ skb_put(skb, sizeof(struct iphdr));
+ skb_reset_network_header(skb);
+ iph = ip_hdr(skb);
+ iph->daddr = daddr;
+
+ serr = SKB_EXT_ERR(skb);
+ serr->ee.ee_errno = err;
+ serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
+ serr->ee.ee_type = 0;
+ serr->ee.ee_code = 0;
+ serr->ee.ee_pad = 0;
+ serr->ee.ee_info = info;
+ serr->ee.ee_data = 0;
+ serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
+ serr->port = port;
+
+ __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
+ skb_reset_transport_header(skb);
+
+ if (sock_queue_err_skb(sk, skb))
+ kfree_skb(skb);
+}
+
+/* For some errors we have valid addr_offset even with zero payload and
+ * zero port. Also, addr_offset should be supported if port is set.
+ */
+static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
+{
+ return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
+ serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
+}
+
+/* IPv4 supports cmsg on all imcp errors and some timestamps
+ *
+ * Timestamp code paths do not initialize the fields expected by cmsg:
+ * the PKTINFO fields in skb->cb[]. Fill those in here.
+ */
+static bool ipv4_datagram_support_cmsg(const struct sock *sk,
+ struct sk_buff *skb,
+ int ee_origin)
+{
+ struct in_pktinfo *info;
+
+ if (ee_origin == SO_EE_ORIGIN_ICMP)
+ return true;
+
+ if (ee_origin == SO_EE_ORIGIN_LOCAL)
+ return false;
+
+ /* Support IP_PKTINFO on tstamp packets if requested, to correlate
+ * timestamp with egress dev. Not possible for packets without iif
+ * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
+ */
+ info = PKTINFO_SKB_CB(skb);
+ if (!(READ_ONCE(sk->sk_tsflags) & SOF_TIMESTAMPING_OPT_CMSG) ||
+ !info->ipi_ifindex)
+ return false;
+
+ info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
+ return true;
+}
+
+/*
+ * Handle MSG_ERRQUEUE
+ */
+int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
+{
+ struct sock_exterr_skb *serr;
+ struct sk_buff *skb;
+ DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
+ struct {
+ struct sock_extended_err ee;
+ struct sockaddr_in offender;
+ } errhdr;
+ int err;
+ int copied;
+
+ err = -EAGAIN;
+ skb = sock_dequeue_err_skb(sk);
+ if (!skb)
+ goto out;
+
+ copied = skb->len;
+ if (copied > len) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+ err = skb_copy_datagram_msg(skb, 0, msg, copied);
+ if (unlikely(err)) {
+ kfree_skb(skb);
+ return err;
+ }
+ sock_recv_timestamp(msg, sk, skb);
+
+ serr = SKB_EXT_ERR(skb);
+
+ if (sin && ipv4_datagram_support_addr(serr)) {
+ sin->sin_family = AF_INET;
+ sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
+ serr->addr_offset);
+ sin->sin_port = serr->port;
+ memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
+ *addr_len = sizeof(*sin);
+ }
+
+ memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
+ sin = &errhdr.offender;
+ memset(sin, 0, sizeof(*sin));
+
+ if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
+ sin->sin_family = AF_INET;
+ sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+ if (inet_sk(sk)->cmsg_flags)
+ ip_cmsg_recv(msg, skb);
+ }
+
+ put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
+
+ /* Now we could try to dump offended packet options */
+
+ msg->msg_flags |= MSG_ERRQUEUE;
+ err = copied;
+
+ consume_skb(skb);
+out:
+ return err;
+}
+
+void __ip_sock_set_tos(struct sock *sk, int val)
+{
+ if (sk->sk_type == SOCK_STREAM) {
+ val &= ~INET_ECN_MASK;
+ val |= inet_sk(sk)->tos & INET_ECN_MASK;
+ }
+ if (inet_sk(sk)->tos != val) {
+ inet_sk(sk)->tos = val;
+ WRITE_ONCE(sk->sk_priority, rt_tos2priority(val));
+ sk_dst_reset(sk);
+ }
+}
+
+void ip_sock_set_tos(struct sock *sk, int val)
+{
+ lock_sock(sk);
+ __ip_sock_set_tos(sk, val);
+ release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_tos);
+
+void ip_sock_set_freebind(struct sock *sk)
+{
+ lock_sock(sk);
+ inet_sk(sk)->freebind = true;
+ release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_freebind);
+
+void ip_sock_set_recverr(struct sock *sk)
+{
+ lock_sock(sk);
+ inet_sk(sk)->recverr = true;
+ release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_recverr);
+
+int ip_sock_set_mtu_discover(struct sock *sk, int val)
+{
+ if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
+ return -EINVAL;
+ lock_sock(sk);
+ inet_sk(sk)->pmtudisc = val;
+ release_sock(sk);
+ return 0;
+}
+EXPORT_SYMBOL(ip_sock_set_mtu_discover);
+
+void ip_sock_set_pktinfo(struct sock *sk)
+{
+ lock_sock(sk);
+ inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO;
+ release_sock(sk);
+}
+EXPORT_SYMBOL(ip_sock_set_pktinfo);
+
+/*
+ * Socket option code for IP. This is the end of the line after any
+ * TCP,UDP etc options on an IP socket.
+ */
+static bool setsockopt_needs_rtnl(int optname)
+{
+ switch (optname) {
+ case IP_ADD_MEMBERSHIP:
+ case IP_ADD_SOURCE_MEMBERSHIP:
+ case IP_BLOCK_SOURCE:
+ case IP_DROP_MEMBERSHIP:
+ case IP_DROP_SOURCE_MEMBERSHIP:
+ case IP_MSFILTER:
+ case IP_UNBLOCK_SOURCE:
+ case MCAST_BLOCK_SOURCE:
+ case MCAST_MSFILTER:
+ case MCAST_JOIN_GROUP:
+ case MCAST_JOIN_SOURCE_GROUP:
+ case MCAST_LEAVE_GROUP:
+ case MCAST_LEAVE_SOURCE_GROUP:
+ case MCAST_UNBLOCK_SOURCE:
+ return true;
+ }
+ return false;
+}
+
+static int set_mcast_msfilter(struct sock *sk, int ifindex,
+ int numsrc, int fmode,
+ struct sockaddr_storage *group,
+ struct sockaddr_storage *list)
+{
+ struct ip_msfilter *msf;
+ struct sockaddr_in *psin;
+ int err, i;
+
+ msf = kmalloc(IP_MSFILTER_SIZE(numsrc), GFP_KERNEL);
+ if (!msf)
+ return -ENOBUFS;
+
+ psin = (struct sockaddr_in *)group;
+ if (psin->sin_family != AF_INET)
+ goto Eaddrnotavail;
+ msf->imsf_multiaddr = psin->sin_addr.s_addr;
+ msf->imsf_interface = 0;
+ msf->imsf_fmode = fmode;
+ msf->imsf_numsrc = numsrc;
+ for (i = 0; i < numsrc; ++i) {
+ psin = (struct sockaddr_in *)&list[i];
+
+ if (psin->sin_family != AF_INET)
+ goto Eaddrnotavail;
+ msf->imsf_slist_flex[i] = psin->sin_addr.s_addr;
+ }
+ err = ip_mc_msfilter(sk, msf, ifindex);
+ kfree(msf);
+ return err;
+
+Eaddrnotavail:
+ kfree(msf);
+ return -EADDRNOTAVAIL;
+}
+
+static int copy_group_source_from_sockptr(struct group_source_req *greqs,
+ sockptr_t optval, int optlen)
+{
+ if (in_compat_syscall()) {
+ struct compat_group_source_req gr32;
+
+ if (optlen != sizeof(gr32))
+ return -EINVAL;
+ if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
+ return -EFAULT;
+ greqs->gsr_interface = gr32.gsr_interface;
+ greqs->gsr_group = gr32.gsr_group;
+ greqs->gsr_source = gr32.gsr_source;
+ } else {
+ if (optlen != sizeof(*greqs))
+ return -EINVAL;
+ if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int do_mcast_group_source(struct sock *sk, int optname,
+ sockptr_t optval, int optlen)
+{
+ struct group_source_req greqs;
+ struct ip_mreq_source mreqs;
+ struct sockaddr_in *psin;
+ int omode, add, err;
+
+ err = copy_group_source_from_sockptr(&greqs, optval, optlen);
+ if (err)
+ return err;
+
+ if (greqs.gsr_group.ss_family != AF_INET ||
+ greqs.gsr_source.ss_family != AF_INET)
+ return -EADDRNOTAVAIL;
+
+ psin = (struct sockaddr_in *)&greqs.gsr_group;
+ mreqs.imr_multiaddr = psin->sin_addr.s_addr;
+ psin = (struct sockaddr_in *)&greqs.gsr_source;
+ mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
+ mreqs.imr_interface = 0; /* use index for mc_source */
+
+ if (optname == MCAST_BLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 1;
+ } else if (optname == MCAST_UNBLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 0;
+ } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
+ struct ip_mreqn mreq;
+
+ psin = (struct sockaddr_in *)&greqs.gsr_group;
+ mreq.imr_multiaddr = psin->sin_addr;
+ mreq.imr_address.s_addr = 0;
+ mreq.imr_ifindex = greqs.gsr_interface;
+ err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
+ if (err && err != -EADDRINUSE)
+ return err;
+ greqs.gsr_interface = mreq.imr_ifindex;
+ omode = MCAST_INCLUDE;
+ add = 1;
+ } else /* MCAST_LEAVE_SOURCE_GROUP */ {
+ omode = MCAST_INCLUDE;
+ add = 0;
+ }
+ return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface);
+}
+
+static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen)
+{
+ struct group_filter *gsf = NULL;
+ int err;
+
+ if (optlen < GROUP_FILTER_SIZE(0))
+ return -EINVAL;
+ if (optlen > READ_ONCE(sysctl_optmem_max))
+ return -ENOBUFS;
+
+ gsf = memdup_sockptr(optval, optlen);
+ if (IS_ERR(gsf))
+ return PTR_ERR(gsf);
+
+ /* numsrc >= (4G-140)/128 overflow in 32 bits */
+ err = -ENOBUFS;
+ if (gsf->gf_numsrc >= 0x1ffffff ||
+ gsf->gf_numsrc > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf))
+ goto out_free_gsf;
+
+ err = -EINVAL;
+ if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
+ goto out_free_gsf;
+
+ err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc,
+ gsf->gf_fmode, &gsf->gf_group,
+ gsf->gf_slist_flex);
+out_free_gsf:
+ kfree(gsf);
+ return err;
+}
+
+static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
+ int optlen)
+{
+ const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
+ struct compat_group_filter *gf32;
+ unsigned int n;
+ void *p;
+ int err;
+
+ if (optlen < size0)
+ return -EINVAL;
+ if (optlen > READ_ONCE(sysctl_optmem_max) - 4)
+ return -ENOBUFS;
+
+ p = kmalloc(optlen + 4, GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+ gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
+
+ err = -EFAULT;
+ if (copy_from_sockptr(gf32, optval, optlen))
+ goto out_free_gsf;
+
+ /* numsrc >= (4G-140)/128 overflow in 32 bits */
+ n = gf32->gf_numsrc;
+ err = -ENOBUFS;
+ if (n >= 0x1ffffff)
+ goto out_free_gsf;
+
+ err = -EINVAL;
+ if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
+ goto out_free_gsf;
+
+ /* numsrc >= (4G-140)/128 overflow in 32 bits */
+ err = -ENOBUFS;
+ if (n > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf))
+ goto out_free_gsf;
+ err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode,
+ &gf32->gf_group, gf32->gf_slist_flex);
+out_free_gsf:
+ kfree(p);
+ return err;
+}
+
+static int ip_mcast_join_leave(struct sock *sk, int optname,
+ sockptr_t optval, int optlen)
+{
+ struct ip_mreqn mreq = { };
+ struct sockaddr_in *psin;
+ struct group_req greq;
+
+ if (optlen < sizeof(struct group_req))
+ return -EINVAL;
+ if (copy_from_sockptr(&greq, optval, sizeof(greq)))
+ return -EFAULT;
+
+ psin = (struct sockaddr_in *)&greq.gr_group;
+ if (psin->sin_family != AF_INET)
+ return -EINVAL;
+ mreq.imr_multiaddr = psin->sin_addr;
+ mreq.imr_ifindex = greq.gr_interface;
+ if (optname == MCAST_JOIN_GROUP)
+ return ip_mc_join_group(sk, &mreq);
+ return ip_mc_leave_group(sk, &mreq);
+}
+
+static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
+ sockptr_t optval, int optlen)
+{
+ struct compat_group_req greq;
+ struct ip_mreqn mreq = { };
+ struct sockaddr_in *psin;
+
+ if (optlen < sizeof(struct compat_group_req))
+ return -EINVAL;
+ if (copy_from_sockptr(&greq, optval, sizeof(greq)))
+ return -EFAULT;
+
+ psin = (struct sockaddr_in *)&greq.gr_group;
+ if (psin->sin_family != AF_INET)
+ return -EINVAL;
+ mreq.imr_multiaddr = psin->sin_addr;
+ mreq.imr_ifindex = greq.gr_interface;
+
+ if (optname == MCAST_JOIN_GROUP)
+ return ip_mc_join_group(sk, &mreq);
+ return ip_mc_leave_group(sk, &mreq);
+}
+
+DEFINE_STATIC_KEY_FALSE(ip4_min_ttl);
+
+int do_ip_setsockopt(struct sock *sk, int level, int optname,
+ sockptr_t optval, unsigned int optlen)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct net *net = sock_net(sk);
+ int val = 0, err;
+ bool needs_rtnl = setsockopt_needs_rtnl(optname);
+
+ switch (optname) {
+ case IP_PKTINFO:
+ case IP_RECVTTL:
+ case IP_RECVOPTS:
+ case IP_RECVTOS:
+ case IP_RETOPTS:
+ case IP_TOS:
+ case IP_TTL:
+ case IP_HDRINCL:
+ case IP_MTU_DISCOVER:
+ case IP_RECVERR:
+ case IP_ROUTER_ALERT:
+ case IP_FREEBIND:
+ case IP_PASSSEC:
+ case IP_TRANSPARENT:
+ case IP_MINTTL:
+ case IP_NODEFRAG:
+ case IP_BIND_ADDRESS_NO_PORT:
+ case IP_UNICAST_IF:
+ case IP_MULTICAST_TTL:
+ case IP_MULTICAST_ALL:
+ case IP_MULTICAST_LOOP:
+ case IP_RECVORIGDSTADDR:
+ case IP_CHECKSUM:
+ case IP_RECVFRAGSIZE:
+ case IP_RECVERR_RFC4884:
+ case IP_LOCAL_PORT_RANGE:
+ if (optlen >= sizeof(int)) {
+ if (copy_from_sockptr(&val, optval, sizeof(val)))
+ return -EFAULT;
+ } else if (optlen >= sizeof(char)) {
+ unsigned char ucval;
+
+ if (copy_from_sockptr(&ucval, optval, sizeof(ucval)))
+ return -EFAULT;
+ val = (int) ucval;
+ }
+ }
+
+ /* If optlen==0, it is equivalent to val == 0 */
+
+ if (optname == IP_ROUTER_ALERT)
+ return ip_ra_control(sk, val ? 1 : 0, NULL);
+ if (ip_mroute_opt(optname))
+ return ip_mroute_setsockopt(sk, optname, optval, optlen);
+
+ err = 0;
+ if (needs_rtnl)
+ rtnl_lock();
+ sockopt_lock_sock(sk);
+
+ switch (optname) {
+ case IP_OPTIONS:
+ {
+ struct ip_options_rcu *old, *opt = NULL;
+
+ if (optlen > 40)
+ goto e_inval;
+ err = ip_options_get(sock_net(sk), &opt, optval, optlen);
+ if (err)
+ break;
+ old = rcu_dereference_protected(inet->inet_opt,
+ lockdep_sock_is_held(sk));
+ if (inet->is_icsk) {
+ struct inet_connection_sock *icsk = inet_csk(sk);
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == PF_INET ||
+ (!((1 << sk->sk_state) &
+ (TCPF_LISTEN | TCPF_CLOSE)) &&
+ inet->inet_daddr != LOOPBACK4_IPV6)) {
+#endif
+ if (old)
+ icsk->icsk_ext_hdr_len -= old->opt.optlen;
+ if (opt)
+ icsk->icsk_ext_hdr_len += opt->opt.optlen;
+ icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
+#if IS_ENABLED(CONFIG_IPV6)
+ }
+#endif
+ }
+ rcu_assign_pointer(inet->inet_opt, opt);
+ if (old)
+ kfree_rcu(old, rcu);
+ break;
+ }
+ case IP_PKTINFO:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_PKTINFO;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
+ break;
+ case IP_RECVTTL:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_TTL;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_TTL;
+ break;
+ case IP_RECVTOS:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_TOS;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_TOS;
+ break;
+ case IP_RECVOPTS:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_RECVOPTS;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
+ break;
+ case IP_RETOPTS:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_RETOPTS;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
+ break;
+ case IP_PASSSEC:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_PASSSEC;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
+ break;
+ case IP_RECVORIGDSTADDR:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
+ break;
+ case IP_CHECKSUM:
+ if (val) {
+ if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
+ inet_inc_convert_csum(sk);
+ inet->cmsg_flags |= IP_CMSG_CHECKSUM;
+ }
+ } else {
+ if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
+ inet_dec_convert_csum(sk);
+ inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
+ }
+ }
+ break;
+ case IP_RECVFRAGSIZE:
+ if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
+ goto e_inval;
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
+ break;
+ case IP_TOS: /* This sets both TOS and Precedence */
+ __ip_sock_set_tos(sk, val);
+ break;
+ case IP_TTL:
+ if (optlen < 1)
+ goto e_inval;
+ if (val != -1 && (val < 1 || val > 255))
+ goto e_inval;
+ inet->uc_ttl = val;
+ break;
+ case IP_HDRINCL:
+ if (sk->sk_type != SOCK_RAW) {
+ err = -ENOPROTOOPT;
+ break;
+ }
+ inet->hdrincl = val ? 1 : 0;
+ break;
+ case IP_NODEFRAG:
+ if (sk->sk_type != SOCK_RAW) {
+ err = -ENOPROTOOPT;
+ break;
+ }
+ inet->nodefrag = val ? 1 : 0;
+ break;
+ case IP_BIND_ADDRESS_NO_PORT:
+ inet->bind_address_no_port = val ? 1 : 0;
+ break;
+ case IP_MTU_DISCOVER:
+ if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
+ goto e_inval;
+ inet->pmtudisc = val;
+ break;
+ case IP_RECVERR:
+ inet->recverr = !!val;
+ if (!val)
+ skb_queue_purge(&sk->sk_error_queue);
+ break;
+ case IP_RECVERR_RFC4884:
+ if (val < 0 || val > 1)
+ goto e_inval;
+ inet->recverr_rfc4884 = !!val;
+ break;
+ case IP_MULTICAST_TTL:
+ if (sk->sk_type == SOCK_STREAM)
+ goto e_inval;
+ if (optlen < 1)
+ goto e_inval;
+ if (val == -1)
+ val = 1;
+ if (val < 0 || val > 255)
+ goto e_inval;
+ inet->mc_ttl = val;
+ break;
+ case IP_MULTICAST_LOOP:
+ if (optlen < 1)
+ goto e_inval;
+ inet->mc_loop = !!val;
+ break;
+ case IP_UNICAST_IF:
+ {
+ struct net_device *dev = NULL;
+ int ifindex;
+ int midx;
+
+ if (optlen != sizeof(int))
+ goto e_inval;
+
+ ifindex = (__force int)ntohl((__force __be32)val);
+ if (ifindex == 0) {
+ inet->uc_index = 0;
+ err = 0;
+ break;
+ }
+
+ dev = dev_get_by_index(sock_net(sk), ifindex);
+ err = -EADDRNOTAVAIL;
+ if (!dev)
+ break;
+
+ midx = l3mdev_master_ifindex(dev);
+ dev_put(dev);
+
+ err = -EINVAL;
+ if (sk->sk_bound_dev_if && midx != sk->sk_bound_dev_if)
+ break;
+
+ inet->uc_index = ifindex;
+ err = 0;
+ break;
+ }
+ case IP_MULTICAST_IF:
+ {
+ struct ip_mreqn mreq;
+ struct net_device *dev = NULL;
+ int midx;
+
+ if (sk->sk_type == SOCK_STREAM)
+ goto e_inval;
+ /*
+ * Check the arguments are allowable
+ */
+
+ if (optlen < sizeof(struct in_addr))
+ goto e_inval;
+
+ err = -EFAULT;
+ if (optlen >= sizeof(struct ip_mreqn)) {
+ if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
+ break;
+ } else {
+ memset(&mreq, 0, sizeof(mreq));
+ if (optlen >= sizeof(struct ip_mreq)) {
+ if (copy_from_sockptr(&mreq, optval,
+ sizeof(struct ip_mreq)))
+ break;
+ } else if (optlen >= sizeof(struct in_addr)) {
+ if (copy_from_sockptr(&mreq.imr_address, optval,
+ sizeof(struct in_addr)))
+ break;
+ }
+ }
+
+ if (!mreq.imr_ifindex) {
+ if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
+ inet->mc_index = 0;
+ inet->mc_addr = 0;
+ err = 0;
+ break;
+ }
+ dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
+ if (dev)
+ mreq.imr_ifindex = dev->ifindex;
+ } else
+ dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
+
+
+ err = -EADDRNOTAVAIL;
+ if (!dev)
+ break;
+
+ midx = l3mdev_master_ifindex(dev);
+
+ dev_put(dev);
+
+ err = -EINVAL;
+ if (sk->sk_bound_dev_if &&
+ mreq.imr_ifindex != sk->sk_bound_dev_if &&
+ midx != sk->sk_bound_dev_if)
+ break;
+
+ inet->mc_index = mreq.imr_ifindex;
+ inet->mc_addr = mreq.imr_address.s_addr;
+ err = 0;
+ break;
+ }
+
+ case IP_ADD_MEMBERSHIP:
+ case IP_DROP_MEMBERSHIP:
+ {
+ struct ip_mreqn mreq;
+
+ err = -EPROTO;
+ if (inet_sk(sk)->is_icsk)
+ break;
+
+ if (optlen < sizeof(struct ip_mreq))
+ goto e_inval;
+ err = -EFAULT;
+ if (optlen >= sizeof(struct ip_mreqn)) {
+ if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
+ break;
+ } else {
+ memset(&mreq, 0, sizeof(mreq));
+ if (copy_from_sockptr(&mreq, optval,
+ sizeof(struct ip_mreq)))
+ break;
+ }
+
+ if (optname == IP_ADD_MEMBERSHIP)
+ err = ip_mc_join_group(sk, &mreq);
+ else
+ err = ip_mc_leave_group(sk, &mreq);
+ break;
+ }
+ case IP_MSFILTER:
+ {
+ struct ip_msfilter *msf;
+
+ if (optlen < IP_MSFILTER_SIZE(0))
+ goto e_inval;
+ if (optlen > READ_ONCE(sysctl_optmem_max)) {
+ err = -ENOBUFS;
+ break;
+ }
+ msf = memdup_sockptr(optval, optlen);
+ if (IS_ERR(msf)) {
+ err = PTR_ERR(msf);
+ break;
+ }
+ /* numsrc >= (1G-4) overflow in 32 bits */
+ if (msf->imsf_numsrc >= 0x3ffffffcU ||
+ msf->imsf_numsrc > READ_ONCE(net->ipv4.sysctl_igmp_max_msf)) {
+ kfree(msf);
+ err = -ENOBUFS;
+ break;
+ }
+ if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
+ kfree(msf);
+ err = -EINVAL;
+ break;
+ }
+ err = ip_mc_msfilter(sk, msf, 0);
+ kfree(msf);
+ break;
+ }
+ case IP_BLOCK_SOURCE:
+ case IP_UNBLOCK_SOURCE:
+ case IP_ADD_SOURCE_MEMBERSHIP:
+ case IP_DROP_SOURCE_MEMBERSHIP:
+ {
+ struct ip_mreq_source mreqs;
+ int omode, add;
+
+ if (optlen != sizeof(struct ip_mreq_source))
+ goto e_inval;
+ if (copy_from_sockptr(&mreqs, optval, sizeof(mreqs))) {
+ err = -EFAULT;
+ break;
+ }
+ if (optname == IP_BLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 1;
+ } else if (optname == IP_UNBLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 0;
+ } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
+ struct ip_mreqn mreq;
+
+ mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
+ mreq.imr_address.s_addr = mreqs.imr_interface;
+ mreq.imr_ifindex = 0;
+ err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
+ if (err && err != -EADDRINUSE)
+ break;
+ omode = MCAST_INCLUDE;
+ add = 1;
+ } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
+ omode = MCAST_INCLUDE;
+ add = 0;
+ }
+ err = ip_mc_source(add, omode, sk, &mreqs, 0);
+ break;
+ }
+ case MCAST_JOIN_GROUP:
+ case MCAST_LEAVE_GROUP:
+ if (in_compat_syscall())
+ err = compat_ip_mcast_join_leave(sk, optname, optval,
+ optlen);
+ else
+ err = ip_mcast_join_leave(sk, optname, optval, optlen);
+ break;
+ case MCAST_JOIN_SOURCE_GROUP:
+ case MCAST_LEAVE_SOURCE_GROUP:
+ case MCAST_BLOCK_SOURCE:
+ case MCAST_UNBLOCK_SOURCE:
+ err = do_mcast_group_source(sk, optname, optval, optlen);
+ break;
+ case MCAST_MSFILTER:
+ if (in_compat_syscall())
+ err = compat_ip_set_mcast_msfilter(sk, optval, optlen);
+ else
+ err = ip_set_mcast_msfilter(sk, optval, optlen);
+ break;
+ case IP_MULTICAST_ALL:
+ if (optlen < 1)
+ goto e_inval;
+ if (val != 0 && val != 1)
+ goto e_inval;
+ inet->mc_all = val;
+ break;
+
+ case IP_FREEBIND:
+ if (optlen < 1)
+ goto e_inval;
+ inet->freebind = !!val;
+ break;
+
+ case IP_IPSEC_POLICY:
+ case IP_XFRM_POLICY:
+ err = -EPERM;
+ if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ break;
+ err = xfrm_user_policy(sk, optname, optval, optlen);
+ break;
+
+ case IP_TRANSPARENT:
+ if (!!val && !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
+ !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
+ err = -EPERM;
+ break;
+ }
+ if (optlen < 1)
+ goto e_inval;
+ inet->transparent = !!val;
+ break;
+
+ case IP_MINTTL:
+ if (optlen < 1)
+ goto e_inval;
+ if (val < 0 || val > 255)
+ goto e_inval;
+
+ if (val)
+ static_branch_enable(&ip4_min_ttl);
+
+ /* tcp_v4_err() and tcp_v4_rcv() might read min_ttl
+ * while we are changint it.
+ */
+ WRITE_ONCE(inet->min_ttl, val);
+ break;
+
+ case IP_LOCAL_PORT_RANGE:
+ {
+ const __u16 lo = val;
+ const __u16 hi = val >> 16;
+
+ if (optlen != sizeof(__u32))
+ goto e_inval;
+ if (lo != 0 && hi != 0 && lo > hi)
+ goto e_inval;
+
+ inet->local_port_range.lo = lo;
+ inet->local_port_range.hi = hi;
+ break;
+ }
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+ sockopt_release_sock(sk);
+ if (needs_rtnl)
+ rtnl_unlock();
+ return err;
+
+e_inval:
+ sockopt_release_sock(sk);
+ if (needs_rtnl)
+ rtnl_unlock();
+ return -EINVAL;
+}
+
+/**
+ * ipv4_pktinfo_prepare - transfer some info from rtable to skb
+ * @sk: socket
+ * @skb: buffer
+ *
+ * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
+ * destination in skb->cb[] before dst drop.
+ * This way, receiver doesn't make cache line misses to read rtable.
+ */
+void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
+{
+ struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
+ bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
+ ipv6_sk_rxinfo(sk);
+
+ if (prepare && skb_rtable(skb)) {
+ /* skb->cb is overloaded: prior to this point it is IP{6}CB
+ * which has interface index (iif) as the first member of the
+ * underlying inet{6}_skb_parm struct. This code then overlays
+ * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
+ * element so the iif is picked up from the prior IPCB. If iif
+ * is the loopback interface, then return the sending interface
+ * (e.g., process binds socket to eth0 for Tx which is
+ * redirected to loopback in the rtable/dst).
+ */
+ struct rtable *rt = skb_rtable(skb);
+ bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
+
+ if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
+ pktinfo->ipi_ifindex = inet_iif(skb);
+ else if (l3slave && rt && rt->rt_iif)
+ pktinfo->ipi_ifindex = rt->rt_iif;
+
+ pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
+ } else {
+ pktinfo->ipi_ifindex = 0;
+ pktinfo->ipi_spec_dst.s_addr = 0;
+ }
+ skb_dst_drop(skb);
+}
+
+int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
+ unsigned int optlen)
+{
+ int err;
+
+ if (level != SOL_IP)
+ return -ENOPROTOOPT;
+
+ err = do_ip_setsockopt(sk, level, optname, optval, optlen);
+#if IS_ENABLED(CONFIG_BPFILTER_UMH)
+ if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
+ optname < BPFILTER_IPT_SET_MAX)
+ err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
+#endif
+#ifdef CONFIG_NETFILTER
+ /* we need to exclude all possible ENOPROTOOPTs except default case */
+ if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
+ optname != IP_IPSEC_POLICY &&
+ optname != IP_XFRM_POLICY &&
+ !ip_mroute_opt(optname))
+ err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
+#endif
+ return err;
+}
+EXPORT_SYMBOL(ip_setsockopt);
+
+/*
+ * Get the options. Note for future reference. The GET of IP options gets
+ * the _received_ ones. The set sets the _sent_ ones.
+ */
+
+static bool getsockopt_needs_rtnl(int optname)
+{
+ switch (optname) {
+ case IP_MSFILTER:
+ case MCAST_MSFILTER:
+ return true;
+ }
+ return false;
+}
+
+static int ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval,
+ sockptr_t optlen, int len)
+{
+ const int size0 = offsetof(struct group_filter, gf_slist_flex);
+ struct group_filter gsf;
+ int num, gsf_size;
+ int err;
+
+ if (len < size0)
+ return -EINVAL;
+ if (copy_from_sockptr(&gsf, optval, size0))
+ return -EFAULT;
+
+ num = gsf.gf_numsrc;
+ err = ip_mc_gsfget(sk, &gsf, optval,
+ offsetof(struct group_filter, gf_slist_flex));
+ if (err)
+ return err;
+ if (gsf.gf_numsrc < num)
+ num = gsf.gf_numsrc;
+ gsf_size = GROUP_FILTER_SIZE(num);
+ if (copy_to_sockptr(optlen, &gsf_size, sizeof(int)) ||
+ copy_to_sockptr(optval, &gsf, size0))
+ return -EFAULT;
+ return 0;
+}
+
+static int compat_ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval,
+ sockptr_t optlen, int len)
+{
+ const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
+ struct compat_group_filter gf32;
+ struct group_filter gf;
+ int num;
+ int err;
+
+ if (len < size0)
+ return -EINVAL;
+ if (copy_from_sockptr(&gf32, optval, size0))
+ return -EFAULT;
+
+ gf.gf_interface = gf32.gf_interface;
+ gf.gf_fmode = gf32.gf_fmode;
+ num = gf.gf_numsrc = gf32.gf_numsrc;
+ gf.gf_group = gf32.gf_group;
+
+ err = ip_mc_gsfget(sk, &gf, optval,
+ offsetof(struct compat_group_filter, gf_slist_flex));
+ if (err)
+ return err;
+ if (gf.gf_numsrc < num)
+ num = gf.gf_numsrc;
+ len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
+ if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
+ copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
+ &gf.gf_fmode, sizeof(gf.gf_fmode)) ||
+ copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
+ &gf.gf_numsrc, sizeof(gf.gf_numsrc)))
+ return -EFAULT;
+ return 0;
+}
+
+int do_ip_getsockopt(struct sock *sk, int level, int optname,
+ sockptr_t optval, sockptr_t optlen)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ bool needs_rtnl = getsockopt_needs_rtnl(optname);
+ int val, err = 0;
+ int len;
+
+ if (level != SOL_IP)
+ return -EOPNOTSUPP;
+
+ if (ip_mroute_opt(optname))
+ return ip_mroute_getsockopt(sk, optname, optval, optlen);
+
+ if (copy_from_sockptr(&len, optlen, sizeof(int)))
+ return -EFAULT;
+ if (len < 0)
+ return -EINVAL;
+
+ if (needs_rtnl)
+ rtnl_lock();
+ sockopt_lock_sock(sk);
+
+ switch (optname) {
+ case IP_OPTIONS:
+ {
+ unsigned char optbuf[sizeof(struct ip_options)+40];
+ struct ip_options *opt = (struct ip_options *)optbuf;
+ struct ip_options_rcu *inet_opt;
+
+ inet_opt = rcu_dereference_protected(inet->inet_opt,
+ lockdep_sock_is_held(sk));
+ opt->optlen = 0;
+ if (inet_opt)
+ memcpy(optbuf, &inet_opt->opt,
+ sizeof(struct ip_options) +
+ inet_opt->opt.optlen);
+ sockopt_release_sock(sk);
+
+ if (opt->optlen == 0) {
+ len = 0;
+ return copy_to_sockptr(optlen, &len, sizeof(int));
+ }
+
+ ip_options_undo(opt);
+
+ len = min_t(unsigned int, len, opt->optlen);
+ if (copy_to_sockptr(optlen, &len, sizeof(int)))
+ return -EFAULT;
+ if (copy_to_sockptr(optval, opt->__data, len))
+ return -EFAULT;
+ return 0;
+ }
+ case IP_PKTINFO:
+ val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
+ break;
+ case IP_RECVTTL:
+ val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
+ break;
+ case IP_RECVTOS:
+ val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
+ break;
+ case IP_RECVOPTS:
+ val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
+ break;
+ case IP_RETOPTS:
+ val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
+ break;
+ case IP_PASSSEC:
+ val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
+ break;
+ case IP_RECVORIGDSTADDR:
+ val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
+ break;
+ case IP_CHECKSUM:
+ val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
+ break;
+ case IP_RECVFRAGSIZE:
+ val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
+ break;
+ case IP_TOS:
+ val = inet->tos;
+ break;
+ case IP_TTL:
+ {
+ struct net *net = sock_net(sk);
+ val = (inet->uc_ttl == -1 ?
+ READ_ONCE(net->ipv4.sysctl_ip_default_ttl) :
+ inet->uc_ttl);
+ break;
+ }
+ case IP_HDRINCL:
+ val = inet->hdrincl;
+ break;
+ case IP_NODEFRAG:
+ val = inet->nodefrag;
+ break;
+ case IP_BIND_ADDRESS_NO_PORT:
+ val = inet->bind_address_no_port;
+ break;
+ case IP_MTU_DISCOVER:
+ val = inet->pmtudisc;
+ break;
+ case IP_MTU:
+ {
+ struct dst_entry *dst;
+ val = 0;
+ dst = sk_dst_get(sk);
+ if (dst) {
+ val = dst_mtu(dst);
+ dst_release(dst);
+ }
+ if (!val) {
+ sockopt_release_sock(sk);
+ return -ENOTCONN;
+ }
+ break;
+ }
+ case IP_RECVERR:
+ val = inet->recverr;
+ break;
+ case IP_RECVERR_RFC4884:
+ val = inet->recverr_rfc4884;
+ break;
+ case IP_MULTICAST_TTL:
+ val = inet->mc_ttl;
+ break;
+ case IP_MULTICAST_LOOP:
+ val = inet->mc_loop;
+ break;
+ case IP_UNICAST_IF:
+ val = (__force int)htonl((__u32) inet->uc_index);
+ break;
+ case IP_MULTICAST_IF:
+ {
+ struct in_addr addr;
+ len = min_t(unsigned int, len, sizeof(struct in_addr));
+ addr.s_addr = inet->mc_addr;
+ sockopt_release_sock(sk);
+
+ if (copy_to_sockptr(optlen, &len, sizeof(int)))
+ return -EFAULT;
+ if (copy_to_sockptr(optval, &addr, len))
+ return -EFAULT;
+ return 0;
+ }
+ case IP_MSFILTER:
+ {
+ struct ip_msfilter msf;
+
+ if (len < IP_MSFILTER_SIZE(0)) {
+ err = -EINVAL;
+ goto out;
+ }
+ if (copy_from_sockptr(&msf, optval, IP_MSFILTER_SIZE(0))) {
+ err = -EFAULT;
+ goto out;
+ }
+ err = ip_mc_msfget(sk, &msf, optval, optlen);
+ goto out;
+ }
+ case MCAST_MSFILTER:
+ if (in_compat_syscall())
+ err = compat_ip_get_mcast_msfilter(sk, optval, optlen,
+ len);
+ else
+ err = ip_get_mcast_msfilter(sk, optval, optlen, len);
+ goto out;
+ case IP_MULTICAST_ALL:
+ val = inet->mc_all;
+ break;
+ case IP_PKTOPTIONS:
+ {
+ struct msghdr msg;
+
+ sockopt_release_sock(sk);
+
+ if (sk->sk_type != SOCK_STREAM)
+ return -ENOPROTOOPT;
+
+ if (optval.is_kernel) {
+ msg.msg_control_is_user = false;
+ msg.msg_control = optval.kernel;
+ } else {
+ msg.msg_control_is_user = true;
+ msg.msg_control_user = optval.user;
+ }
+ msg.msg_controllen = len;
+ msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0;
+
+ if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
+ struct in_pktinfo info;
+
+ info.ipi_addr.s_addr = inet->inet_rcv_saddr;
+ info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
+ info.ipi_ifindex = inet->mc_index;
+ put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
+ }
+ if (inet->cmsg_flags & IP_CMSG_TTL) {
+ int hlim = inet->mc_ttl;
+ put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
+ }
+ if (inet->cmsg_flags & IP_CMSG_TOS) {
+ int tos = inet->rcv_tos;
+ put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
+ }
+ len -= msg.msg_controllen;
+ return copy_to_sockptr(optlen, &len, sizeof(int));
+ }
+ case IP_FREEBIND:
+ val = inet->freebind;
+ break;
+ case IP_TRANSPARENT:
+ val = inet->transparent;
+ break;
+ case IP_MINTTL:
+ val = inet->min_ttl;
+ break;
+ case IP_LOCAL_PORT_RANGE:
+ val = inet->local_port_range.hi << 16 | inet->local_port_range.lo;
+ break;
+ case IP_PROTOCOL:
+ val = inet_sk(sk)->inet_num;
+ break;
+ default:
+ sockopt_release_sock(sk);
+ return -ENOPROTOOPT;
+ }
+ sockopt_release_sock(sk);
+
+ if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
+ unsigned char ucval = (unsigned char)val;
+ len = 1;
+ if (copy_to_sockptr(optlen, &len, sizeof(int)))
+ return -EFAULT;
+ if (copy_to_sockptr(optval, &ucval, 1))
+ return -EFAULT;
+ } else {
+ len = min_t(unsigned int, sizeof(int), len);
+ if (copy_to_sockptr(optlen, &len, sizeof(int)))
+ return -EFAULT;
+ if (copy_to_sockptr(optval, &val, len))
+ return -EFAULT;
+ }
+ return 0;
+
+out:
+ sockopt_release_sock(sk);
+ if (needs_rtnl)
+ rtnl_unlock();
+ return err;
+}
+
+int ip_getsockopt(struct sock *sk, int level,
+ int optname, char __user *optval, int __user *optlen)
+{
+ int err;
+
+ err = do_ip_getsockopt(sk, level, optname,
+ USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
+
+#if IS_ENABLED(CONFIG_BPFILTER_UMH)
+ if (optname >= BPFILTER_IPT_SO_GET_INFO &&
+ optname < BPFILTER_IPT_GET_MAX)
+ err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
+#endif
+#ifdef CONFIG_NETFILTER
+ /* we need to exclude all possible ENOPROTOOPTs except default case */
+ if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
+ !ip_mroute_opt(optname)) {
+ int len;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+
+ err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
+ if (err >= 0)
+ err = put_user(len, optlen);
+ return err;
+ }
+#endif
+ return err;
+}
+EXPORT_SYMBOL(ip_getsockopt);