diff options
Diffstat (limited to 'net/l2tp')
| -rw-r--r-- | net/l2tp/l2tp_core.c | 34 | ||||
| -rw-r--r-- | net/l2tp/l2tp_core.h | 46 | ||||
| -rw-r--r-- | net/l2tp/l2tp_debugfs.c | 8 | ||||
| -rw-r--r-- | net/l2tp/l2tp_eth.c | 25 | ||||
| -rw-r--r-- | net/l2tp/l2tp_ip.c | 2 | ||||
| -rw-r--r-- | net/l2tp/l2tp_ip6.c | 13 | ||||
| -rw-r--r-- | net/l2tp/l2tp_netlink.c | 26 | ||||
| -rw-r--r-- | net/l2tp/l2tp_ppp.c | 327 |
8 files changed, 175 insertions, 306 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 40261cb68e83..ac6a00bcec71 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -322,8 +322,7 @@ int l2tp_session_register(struct l2tp_session *session, if (tunnel->version == L2TP_HDR_VER_3) { pn = l2tp_pernet(tunnel->l2tp_net); - g_head = l2tp_session_id_hash_2(l2tp_pernet(tunnel->l2tp_net), - session->session_id); + g_head = l2tp_session_id_hash_2(pn, session->session_id); spin_lock_bh(&pn->l2tp_session_hlist_lock); @@ -620,7 +619,7 @@ discard: */ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, unsigned char *ptr, unsigned char *optr, u16 hdrflags, - int length, int (*payload_hook)(struct sk_buff *skb)) + int length) { struct l2tp_tunnel *tunnel = session->tunnel; int offset; @@ -741,13 +740,6 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, __skb_pull(skb, offset); - /* If caller wants to process the payload before we queue the - * packet, do so now. - */ - if (payload_hook) - if ((*payload_hook)(skb)) - goto discard; - /* Prepare skb for adding to the session's reorder_q. Hold * packets for max reorder_timeout or 1 second if not * reordering. @@ -783,7 +775,7 @@ EXPORT_SYMBOL(l2tp_recv_common); /* Drop skbs from the session's reorder_q */ -int l2tp_session_queue_purge(struct l2tp_session *session) +static int l2tp_session_queue_purge(struct l2tp_session *session) { struct sk_buff *skb = NULL; BUG_ON(!session); @@ -794,7 +786,6 @@ int l2tp_session_queue_purge(struct l2tp_session *session) } return 0; } -EXPORT_SYMBOL_GPL(l2tp_session_queue_purge); /* Internal UDP receive frame. Do the real work of receiving an L2TP data frame * here. The skb is not on a list when we get here. @@ -802,8 +793,7 @@ EXPORT_SYMBOL_GPL(l2tp_session_queue_purge); * Returns 1 if the packet was not a good data packet and could not be * forwarded. All such packets are passed up to userspace to deal with. */ -static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb, - int (*payload_hook)(struct sk_buff *skb)) +static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb) { struct l2tp_session *session = NULL; unsigned char *ptr, *optr; @@ -894,7 +884,7 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb, goto error; } - l2tp_recv_common(session, skb, ptr, optr, hdrflags, length, payload_hook); + l2tp_recv_common(session, skb, ptr, optr, hdrflags, length); l2tp_session_dec_refcount(session); return 0; @@ -923,7 +913,7 @@ int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) l2tp_dbg(tunnel, L2TP_MSG_DATA, "%s: received %d bytes\n", tunnel->name, skb->len); - if (l2tp_udp_recv_core(tunnel, skb, tunnel->recv_payload_hook)) + if (l2tp_udp_recv_core(tunnel, skb)) goto pass_up; return 0; @@ -1009,8 +999,8 @@ static int l2tp_build_l2tpv3_header(struct l2tp_session *session, void *buf) return bufp - optr; } -static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, - struct flowi *fl, size_t data_len) +static void l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, + struct flowi *fl, size_t data_len) { struct l2tp_tunnel *tunnel = session->tunnel; unsigned int len = skb->len; @@ -1052,8 +1042,6 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, atomic_long_inc(&tunnel->stats.tx_errors); atomic_long_inc(&session->stats.tx_errors); } - - return 0; } /* If caller requires the skb to have a ppp header, the header must be @@ -1193,7 +1181,7 @@ end: /* When the tunnel is closed, all the attached sessions need to go too. */ -void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel) +static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel) { int hash; struct hlist_node *walk; @@ -1242,7 +1230,6 @@ again: } write_unlock_bh(&tunnel->hlist_lock); } -EXPORT_SYMBOL_GPL(l2tp_tunnel_closeall); /* Tunnel socket destroy hook for UDP encapsulation */ static void l2tp_udp_encap_destroy(struct sock *sk) @@ -1687,8 +1674,6 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn if (cfg) { session->pwtype = cfg->pw_type; session->debug = cfg->debug; - session->mtu = cfg->mtu; - session->mru = cfg->mru; session->send_seq = cfg->send_seq; session->recv_seq = cfg->recv_seq; session->lns_mode = cfg->lns_mode; @@ -1800,4 +1785,3 @@ MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); MODULE_DESCRIPTION("L2TP core"); MODULE_LICENSE("GPL"); MODULE_VERSION(L2TP_DRV_VERSION); - diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h index c199020f8a8a..5804065dfbfb 100644 --- a/net/l2tp/l2tp_core.h +++ b/net/l2tp/l2tp_core.h @@ -12,6 +12,9 @@ #ifndef _L2TP_CORE_H_ #define _L2TP_CORE_H_ +#include <net/dst.h> +#include <net/sock.h> + /* Just some random numbers */ #define L2TP_TUNNEL_MAGIC 0x42114DDA #define L2TP_SESSION_MAGIC 0x0C04EB7D @@ -45,10 +48,6 @@ struct l2tp_tunnel; */ struct l2tp_session_cfg { enum l2tp_pwtype pw_type; - unsigned int data_seq:2; /* data sequencing level - * 0 => none, 1 => IP only, - * 2 => all - */ unsigned int recv_seq:1; /* expect receive packets with * sequence numbers? */ unsigned int send_seq:1; /* send packets with sequence @@ -58,7 +57,6 @@ struct l2tp_session_cfg { * control of LNS. */ int debug; /* bitmask of debug message * categories */ - u16 vlan_id; /* VLAN pseudowire only */ u16 l2specific_type; /* Layer 2 specific type */ u8 cookie[8]; /* optional cookie */ int cookie_len; /* 0, 4 or 8 bytes */ @@ -66,8 +64,6 @@ struct l2tp_session_cfg { int peer_cookie_len; /* 0, 4 or 8 bytes */ int reorder_timeout; /* configured reorder timeout * (in jiffies) */ - int mtu; - int mru; char *ifname; }; @@ -99,10 +95,6 @@ struct l2tp_session { char name[32]; /* for logging */ char ifname[IFNAMSIZ]; - unsigned int data_seq:2; /* data sequencing level - * 0 => none, 1 => IP only, - * 2 => all - */ unsigned int recv_seq:1; /* expect receive packets with * sequence numbers? */ unsigned int send_seq:1; /* send packets with sequence @@ -115,8 +107,6 @@ struct l2tp_session { int reorder_timeout; /* configured reorder timeout * (in jiffies) */ int reorder_skip; /* set if skip to next nr */ - int mtu; - int mru; enum l2tp_pwtype pwtype; struct l2tp_stats stats; struct hlist_node global_hlist; /* Global hash list node */ @@ -180,18 +170,12 @@ struct l2tp_tunnel { struct net *l2tp_net; /* the net we belong to */ refcount_t ref_count; -#ifdef CONFIG_DEBUG_FS - void (*show)(struct seq_file *m, void *arg); -#endif - int (*recv_payload_hook)(struct sk_buff *skb); void (*old_sk_destruct)(struct sock *); struct sock *sock; /* Parent socket */ int fd; /* Parent fd, if tunnel socket * was created by userspace */ struct work_struct del_work; - - uint8_t priv[0]; /* private data */ }; struct l2tp_nl_cmd_ops { @@ -201,11 +185,6 @@ struct l2tp_nl_cmd_ops { int (*session_delete)(struct l2tp_session *session); }; -static inline void *l2tp_tunnel_priv(struct l2tp_tunnel *tunnel) -{ - return &tunnel->priv[0]; -} - static inline void *l2tp_session_priv(struct l2tp_session *session) { return &session->priv[0]; @@ -229,7 +208,6 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, int l2tp_tunnel_register(struct l2tp_tunnel *tunnel, struct net *net, struct l2tp_tunnel_cfg *cfg); -void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel); void l2tp_tunnel_delete(struct l2tp_tunnel *tunnel); struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, @@ -243,8 +221,7 @@ int l2tp_session_delete(struct l2tp_session *session); void l2tp_session_free(struct l2tp_session *session); void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, unsigned char *ptr, unsigned char *optr, u16 hdrflags, - int length, int (*payload_hook)(struct sk_buff *skb)); -int l2tp_session_queue_purge(struct l2tp_session *session); + int length); int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb); void l2tp_session_set_header_len(struct l2tp_session *session, int version); @@ -292,6 +269,21 @@ static inline int l2tp_get_l2specific_len(struct l2tp_session *session) } } +static inline u32 l2tp_tunnel_dst_mtu(const struct l2tp_tunnel *tunnel) +{ + struct dst_entry *dst; + u32 mtu; + + dst = sk_dst_get(tunnel->sock); + if (!dst) + return 0; + + mtu = dst_mtu(dst); + dst_release(dst); + + return mtu; +} + #define l2tp_printk(ptr, type, func, fmt, ...) \ do { \ if (((ptr)->debug) & (type)) \ diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c index e87686f7d63c..9821a1458555 100644 --- a/net/l2tp/l2tp_debugfs.c +++ b/net/l2tp/l2tp_debugfs.c @@ -177,9 +177,6 @@ static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v) atomic_long_read(&tunnel->stats.rx_packets), atomic_long_read(&tunnel->stats.rx_bytes), atomic_long_read(&tunnel->stats.rx_errors)); - - if (tunnel->show != NULL) - tunnel->show(m, tunnel); } static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v) @@ -194,12 +191,9 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v) if (session->send_seq || session->recv_seq) seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns); seq_printf(m, " refcnt %d\n", refcount_read(&session->ref_count)); - seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n", - session->mtu, session->mru, + seq_printf(m, " config 0/0/%c/%c/-/%s %08x %u\n", session->recv_seq ? 'R' : '-', session->send_seq ? 'S' : '-', - session->data_seq == 1 ? "IPSEQ" : - session->data_seq == 2 ? "DATASEQ" : "-", session->lns_mode ? "LNS" : "LAC", session->debug, jiffies_to_msecs(session->reorder_timeout)); diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c index 5c366ecfa1cb..3728986ec885 100644 --- a/net/l2tp/l2tp_eth.c +++ b/net/l2tp/l2tp_eth.c @@ -226,22 +226,19 @@ static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel, struct net_device *dev) { unsigned int overhead = 0; - struct dst_entry *dst; u32 l3_overhead = 0; + u32 mtu; /* if the encap is UDP, account for UDP header size */ if (tunnel->encap == L2TP_ENCAPTYPE_UDP) { overhead += sizeof(struct udphdr); dev->needed_headroom += sizeof(struct udphdr); } - if (session->mtu != 0) { - dev->mtu = session->mtu; - dev->needed_headroom += session->hdr_len; - return; - } + lock_sock(tunnel->sock); l3_overhead = kernel_sock_ip_overhead(tunnel->sock); release_sock(tunnel->sock); + if (l3_overhead == 0) { /* L3 Overhead couldn't be identified, this could be * because tunnel->sock was NULL or the socket's @@ -255,18 +252,12 @@ static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel, */ overhead += session->hdr_len + ETH_HLEN + l3_overhead; - /* If PMTU discovery was enabled, use discovered MTU on L2TP device */ - dst = sk_dst_get(tunnel->sock); - if (dst) { - /* dst_mtu will use PMTU if found, else fallback to intf MTU */ - u32 pmtu = dst_mtu(dst); + mtu = l2tp_tunnel_dst_mtu(tunnel) - overhead; + if (mtu < dev->min_mtu || mtu > dev->max_mtu) + dev->mtu = ETH_DATA_LEN - overhead; + else + dev->mtu = mtu; - if (pmtu != 0) - dev->mtu = pmtu; - dst_release(dst); - } - session->mtu = dev->mtu - overhead; - dev->mtu = session->mtu; dev->needed_headroom += session->hdr_len; } diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c index a9c05b2bc1b0..0bc39cc20a3f 100644 --- a/net/l2tp/l2tp_ip.c +++ b/net/l2tp/l2tp_ip.c @@ -165,7 +165,7 @@ static int l2tp_ip_recv(struct sk_buff *skb) print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length); } - l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook); + l2tp_recv_common(session, skb, ptr, optr, 0, skb->len); l2tp_session_dec_refcount(session); return 0; diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index 957369192ca1..42f828cf62fb 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -178,8 +178,7 @@ static int l2tp_ip6_recv(struct sk_buff *skb) print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length); } - l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, - tunnel->recv_payload_hook); + l2tp_recv_common(session, skb, ptr, optr, 0, skb->len); l2tp_session_dec_refcount(session); return 0; @@ -500,7 +499,6 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) struct ip6_flowlabel *flowlabel = NULL; struct dst_entry *dst = NULL; struct flowi6 fl6; - struct sockcm_cookie sockc_unused = {0}; struct ipcm6_cookie ipc6; int addr_len = msg->msg_namelen; int transhdrlen = 4; /* zero session-id */ @@ -525,9 +523,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) fl6.flowi6_mark = sk->sk_mark; fl6.flowi6_uid = sk->sk_uid; - ipc6.hlimit = -1; - ipc6.tclass = -1; - ipc6.dontfrag = -1; + ipcm6_init(&ipc6); if (lsa) { if (addr_len < SIN6_LEN_RFC2133) @@ -575,8 +571,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) opt->tot_len = sizeof(struct ipv6_txoptions); ipc6.opt = opt; - err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, - &sockc_unused); + err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); if (err < 0) { fl6_sock_release(flowlabel); return err; @@ -641,7 +636,7 @@ back_from_confirm: err = ip6_append_data(sk, ip_generic_getfrag, msg, ulen, transhdrlen, &ipc6, &fl6, (struct rt6_info *)dst, - msg->msg_flags, &sockc_unused); + msg->msg_flags); if (err) ip6_flush_pending_frames(sk); else if (!(msg->msg_flags & MSG_MORE)) diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c index 5b9900889e31..2e1e92651545 100644 --- a/net/l2tp/l2tp_netlink.c +++ b/net/l2tp/l2tp_netlink.c @@ -560,9 +560,6 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf } if (tunnel->version > 2) { - if (info->attrs[L2TP_ATTR_DATA_SEQ]) - cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); - if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) { cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT && @@ -594,9 +591,6 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf } if (info->attrs[L2TP_ATTR_IFNAME]) cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); - - if (info->attrs[L2TP_ATTR_VLAN_ID]) - cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); } if (info->attrs[L2TP_ATTR_DEBUG]) @@ -614,12 +608,6 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); - if (info->attrs[L2TP_ATTR_MTU]) - cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); - - if (info->attrs[L2TP_ATTR_MRU]) - cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); - #ifdef CONFIG_MODULES if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) { genl_unlock(); @@ -693,9 +681,6 @@ static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *inf if (info->attrs[L2TP_ATTR_DEBUG]) session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); - if (info->attrs[L2TP_ATTR_DATA_SEQ]) - session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); - if (info->attrs[L2TP_ATTR_RECV_SEQ]) session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); @@ -710,12 +695,6 @@ static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *inf if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); - if (info->attrs[L2TP_ATTR_MTU]) - session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); - - if (info->attrs[L2TP_ATTR_MRU]) - session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); - ret = l2tp_session_notify(&l2tp_nl_family, info, session, L2TP_CMD_SESSION_MODIFY); @@ -745,10 +724,7 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int fl nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id) || nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) || - nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) || - nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) || - (session->mru && - nla_put_u16(skb, L2TP_ATTR_MRU, session->mru))) + nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype)) goto nla_put_failure; if ((session->ifname[0] && diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index cf6cca260e7b..6e2c8e7595e0 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -93,7 +93,6 @@ #include <linux/nsproxy.h> #include <net/net_namespace.h> #include <net/netns/generic.h> -#include <net/dst.h> #include <net/ip.h> #include <net/udp.h> #include <net/xfrm.h> @@ -127,8 +126,6 @@ struct pppol2tp_session { * PPPoX socket */ struct sock *__sk; /* Copy of .sk, for cleanup */ struct rcu_head rcu; /* For asynchronous release */ - int flags; /* accessed by PPPIOCGFLAGS. - * Unused. */ }; static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); @@ -183,25 +180,6 @@ out: * Receive data handling *****************************************************************************/ -static int pppol2tp_recv_payload_hook(struct sk_buff *skb) -{ - /* Skip PPP header, if present. In testing, Microsoft L2TP clients - * don't send the PPP header (PPP header compression enabled), but - * other clients can include the header. So we cope with both cases - * here. The PPP header is always FF03 when using L2TP. - * - * Note that skb->data[] isn't dereferenced from a u16 ptr here since - * the field may be unaligned. - */ - if (!pskb_may_pull(skb, 2)) - return 1; - - if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI)) - skb_pull(skb, 2); - - return 0; -} - /* Receive message. This is the recvmsg for the PPPoL2TP socket. */ static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, @@ -248,6 +226,17 @@ static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int if (sk == NULL) goto no_sock; + /* If the first two bytes are 0xFF03, consider that it is the PPP's + * Address and Control fields and skip them. The L2TP module has always + * worked this way, although, in theory, the use of these fields should + * be negociated and handled at the PPP layer. These fields are + * constant: 0xFF is the All-Stations Address and 0x03 the Unnumbered + * Information command with Poll/Final bit set to zero (RFC 1662). + */ + if (pskb_may_pull(skb, 2) && skb->data[0] == PPP_ALLSTATIONS && + skb->data[1] == PPP_UI) + skb_pull(skb, 2); + if (sk->sk_state & PPPOX_BOUND) { struct pppox_sock *po; @@ -424,12 +413,6 @@ static void pppol2tp_put_sk(struct rcu_head *head) sock_put(ps->__sk); } -/* Called by l2tp_core when a session socket is being closed. - */ -static void pppol2tp_session_close(struct l2tp_session *session) -{ -} - /* Really kill the session socket. (Called from sock_put() if * refcnt == 0.) */ @@ -570,10 +553,8 @@ static void pppol2tp_show(struct seq_file *m, void *arg) static void pppol2tp_session_init(struct l2tp_session *session) { struct pppol2tp_session *ps; - struct dst_entry *dst; session->recv_skb = pppol2tp_recv; - session->session_close = pppol2tp_session_close; #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) session->show = pppol2tp_show; #endif @@ -581,18 +562,106 @@ static void pppol2tp_session_init(struct l2tp_session *session) ps = l2tp_session_priv(session); mutex_init(&ps->sk_lock); ps->owner = current->pid; +} - /* If PMTU discovery was enabled, use the MTU that was discovered */ - dst = sk_dst_get(session->tunnel->sock); - if (dst) { - u32 pmtu = dst_mtu(dst); +struct l2tp_connect_info { + u8 version; + int fd; + u32 tunnel_id; + u32 peer_tunnel_id; + u32 session_id; + u32 peer_session_id; +}; - if (pmtu) { - session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD; - session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD; - } - dst_release(dst); +static int pppol2tp_sockaddr_get_info(const void *sa, int sa_len, + struct l2tp_connect_info *info) +{ + switch (sa_len) { + case sizeof(struct sockaddr_pppol2tp): + { + const struct sockaddr_pppol2tp *sa_v2in4 = sa; + + if (sa_v2in4->sa_protocol != PX_PROTO_OL2TP) + return -EINVAL; + + info->version = 2; + info->fd = sa_v2in4->pppol2tp.fd; + info->tunnel_id = sa_v2in4->pppol2tp.s_tunnel; + info->peer_tunnel_id = sa_v2in4->pppol2tp.d_tunnel; + info->session_id = sa_v2in4->pppol2tp.s_session; + info->peer_session_id = sa_v2in4->pppol2tp.d_session; + + break; + } + case sizeof(struct sockaddr_pppol2tpv3): + { + const struct sockaddr_pppol2tpv3 *sa_v3in4 = sa; + + if (sa_v3in4->sa_protocol != PX_PROTO_OL2TP) + return -EINVAL; + + info->version = 3; + info->fd = sa_v3in4->pppol2tp.fd; + info->tunnel_id = sa_v3in4->pppol2tp.s_tunnel; + info->peer_tunnel_id = sa_v3in4->pppol2tp.d_tunnel; + info->session_id = sa_v3in4->pppol2tp.s_session; + info->peer_session_id = sa_v3in4->pppol2tp.d_session; + + break; } + case sizeof(struct sockaddr_pppol2tpin6): + { + const struct sockaddr_pppol2tpin6 *sa_v2in6 = sa; + + if (sa_v2in6->sa_protocol != PX_PROTO_OL2TP) + return -EINVAL; + + info->version = 2; + info->fd = sa_v2in6->pppol2tp.fd; + info->tunnel_id = sa_v2in6->pppol2tp.s_tunnel; + info->peer_tunnel_id = sa_v2in6->pppol2tp.d_tunnel; + info->session_id = sa_v2in6->pppol2tp.s_session; + info->peer_session_id = sa_v2in6->pppol2tp.d_session; + + break; + } + case sizeof(struct sockaddr_pppol2tpv3in6): + { + const struct sockaddr_pppol2tpv3in6 *sa_v3in6 = sa; + + if (sa_v3in6->sa_protocol != PX_PROTO_OL2TP) + return -EINVAL; + + info->version = 3; + info->fd = sa_v3in6->pppol2tp.fd; + info->tunnel_id = sa_v3in6->pppol2tp.s_tunnel; + info->peer_tunnel_id = sa_v3in6->pppol2tp.d_tunnel; + info->session_id = sa_v3in6->pppol2tp.s_session; + info->peer_session_id = sa_v3in6->pppol2tp.d_session; + + break; + } + default: + return -EINVAL; + } + + return 0; +} + +/* Rough estimation of the maximum payload size a tunnel can transmit without + * fragmenting at the lower IP layer. Assumes L2TPv2 with sequence + * numbers and no IP option. Not quite accurate, but the result is mostly + * unused anyway. + */ +static int pppol2tp_tunnel_mtu(const struct l2tp_tunnel *tunnel) +{ + int mtu; + + mtu = l2tp_tunnel_dst_mtu(tunnel); + if (mtu <= PPPOL2TP_HEADER_OVERHEAD) + return 1500 - PPPOL2TP_HEADER_OVERHEAD; + + return mtu - PPPOL2TP_HEADER_OVERHEAD; } /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket @@ -601,34 +670,23 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, int sockaddr_len, int flags) { struct sock *sk = sock->sk; - struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; struct pppox_sock *po = pppox_sk(sk); struct l2tp_session *session = NULL; + struct l2tp_connect_info info; struct l2tp_tunnel *tunnel; struct pppol2tp_session *ps; struct l2tp_session_cfg cfg = { 0, }; - int error = 0; - u32 tunnel_id, peer_tunnel_id; - u32 session_id, peer_session_id; bool drop_refcnt = false; bool drop_tunnel = false; bool new_session = false; bool new_tunnel = false; - int ver = 2; - int fd; - - lock_sock(sk); - - error = -EINVAL; + int error; - if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) && - sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) && - sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) && - sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6)) - goto end; + error = pppol2tp_sockaddr_get_info(uservaddr, sockaddr_len, &info); + if (error < 0) + return error; - if (sp->sa_protocol != PX_PROTO_OL2TP) - goto end; + lock_sock(sk); /* Check for already bound sockets */ error = -EBUSY; @@ -640,56 +698,12 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, if (sk->sk_user_data) goto end; /* socket is already attached */ - /* Get params from socket address. Handle L2TPv2 and L2TPv3. - * This is nasty because there are different sockaddr_pppol2tp - * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use - * the sockaddr size to determine which structure the caller - * is using. - */ - peer_tunnel_id = 0; - if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { - fd = sp->pppol2tp.fd; - tunnel_id = sp->pppol2tp.s_tunnel; - peer_tunnel_id = sp->pppol2tp.d_tunnel; - session_id = sp->pppol2tp.s_session; - peer_session_id = sp->pppol2tp.d_session; - } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { - struct sockaddr_pppol2tpv3 *sp3 = - (struct sockaddr_pppol2tpv3 *) sp; - ver = 3; - fd = sp3->pppol2tp.fd; - tunnel_id = sp3->pppol2tp.s_tunnel; - peer_tunnel_id = sp3->pppol2tp.d_tunnel; - session_id = sp3->pppol2tp.s_session; - peer_session_id = sp3->pppol2tp.d_session; - } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { - struct sockaddr_pppol2tpin6 *sp6 = - (struct sockaddr_pppol2tpin6 *) sp; - fd = sp6->pppol2tp.fd; - tunnel_id = sp6->pppol2tp.s_tunnel; - peer_tunnel_id = sp6->pppol2tp.d_tunnel; - session_id = sp6->pppol2tp.s_session; - peer_session_id = sp6->pppol2tp.d_session; - } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { - struct sockaddr_pppol2tpv3in6 *sp6 = - (struct sockaddr_pppol2tpv3in6 *) sp; - ver = 3; - fd = sp6->pppol2tp.fd; - tunnel_id = sp6->pppol2tp.s_tunnel; - peer_tunnel_id = sp6->pppol2tp.d_tunnel; - session_id = sp6->pppol2tp.s_session; - peer_session_id = sp6->pppol2tp.d_session; - } else { - error = -EINVAL; - goto end; /* bad socket address */ - } - /* Don't bind if tunnel_id is 0 */ error = -EINVAL; - if (tunnel_id == 0) + if (!info.tunnel_id) goto end; - tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id); + tunnel = l2tp_tunnel_get(sock_net(sk), info.tunnel_id); if (tunnel) drop_tunnel = true; @@ -697,7 +711,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, * peer_session_id is 0. Otherwise look up tunnel using supplied * tunnel id. */ - if ((session_id == 0) && (peer_session_id == 0)) { + if (!info.session_id && !info.peer_session_id) { if (tunnel == NULL) { struct l2tp_tunnel_cfg tcfg = { .encap = L2TP_ENCAPTYPE_UDP, @@ -707,12 +721,16 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, /* Prevent l2tp_tunnel_register() from trying to set up * a kernel socket. */ - if (fd < 0) { + if (info.fd < 0) { error = -EBADF; goto end; } - error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); + error = l2tp_tunnel_create(sock_net(sk), info.fd, + info.version, + info.tunnel_id, + info.peer_tunnel_id, &tcfg, + &tunnel); if (error < 0) goto end; @@ -737,13 +755,10 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, goto end; } - if (tunnel->recv_payload_hook == NULL) - tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; - if (tunnel->peer_tunnel_id == 0) - tunnel->peer_tunnel_id = peer_tunnel_id; + tunnel->peer_tunnel_id = info.peer_tunnel_id; - session = l2tp_session_get(sock_net(sk), tunnel, session_id); + session = l2tp_session_get(sock_net(sk), tunnel, info.session_id); if (session) { drop_refcnt = true; @@ -766,14 +781,11 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, goto end; } } else { - /* Default MTU must allow space for UDP/L2TP/PPP headers */ - cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; - cfg.mru = cfg.mtu; cfg.pw_type = L2TP_PWTYPE_PPP; session = l2tp_session_create(sizeof(struct pppol2tp_session), - tunnel, session_id, - peer_session_id, &cfg); + tunnel, info.session_id, + info.peer_session_id, &cfg); if (IS_ERR(session)) { error = PTR_ERR(session); goto end; @@ -813,7 +825,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, po->chan.private = sk; po->chan.ops = &pppol2tp_chan_ops; - po->chan.mtu = session->mtu; + po->chan.mtu = pppol2tp_tunnel_mtu(tunnel); error = ppp_register_net_channel(sock_net(sk), &po->chan); if (error) { @@ -869,12 +881,6 @@ static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel, goto err; } - /* Default MTU values. */ - if (cfg->mtu == 0) - cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; - if (cfg->mru == 0) - cfg->mru = cfg->mtu; - /* Allocate and initialize a new session context. */ session = l2tp_session_create(sizeof(struct pppol2tp_session), tunnel, session_id, @@ -1038,11 +1044,9 @@ static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, static int pppol2tp_session_ioctl(struct l2tp_session *session, unsigned int cmd, unsigned long arg) { - struct ifreq ifr; int err = 0; struct sock *sk; int val = (int) arg; - struct pppol2tp_session *ps = l2tp_session_priv(session); struct l2tp_tunnel *tunnel = session->tunnel; struct pppol2tp_ioc_stats stats; @@ -1055,85 +1059,19 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session, return -EBADR; switch (cmd) { - case SIOCGIFMTU: - err = -ENXIO; - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - err = -EFAULT; - if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) - break; - ifr.ifr_mtu = session->mtu; - if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) - break; - - l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n", - session->name, session->mtu); - err = 0; - break; - - case SIOCSIFMTU: - err = -ENXIO; - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - err = -EFAULT; - if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) - break; - - session->mtu = ifr.ifr_mtu; - - l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n", - session->name, session->mtu); - err = 0; - break; - case PPPIOCGMRU: - err = -ENXIO; - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - err = -EFAULT; - if (put_user(session->mru, (int __user *) arg)) - break; - - l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n", - session->name, session->mru); - err = 0; - break; - - case PPPIOCSMRU: - err = -ENXIO; - if (!(sk->sk_state & PPPOX_CONNECTED)) - break; - - err = -EFAULT; - if (get_user(val, (int __user *) arg)) - break; - - session->mru = val; - l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n", - session->name, session->mru); - err = 0; - break; - case PPPIOCGFLAGS: err = -EFAULT; - if (put_user(ps->flags, (int __user *) arg)) + if (put_user(0, (int __user *)arg)) break; - - l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n", - session->name, ps->flags); err = 0; break; + case PPPIOCSMRU: case PPPIOCSFLAGS: err = -EFAULT; - if (get_user(val, (int __user *) arg)) + if (get_user(val, (int __user *)arg)) break; - ps->flags = val; - l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n", - session->name, ps->flags); err = 0; break; @@ -1722,8 +1660,7 @@ static void pppol2tp_seq_session_show(struct seq_file *m, void *v) tunnel->peer_tunnel_id, session->peer_session_id, state, user_data_ok); - seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", - session->mtu, session->mru, + seq_printf(m, " 0/0/%c/%c/%s %08x %u\n", session->recv_seq ? 'R' : '-', session->send_seq ? 'S' : '-', session->lns_mode ? "LNS" : "LAC", |