From: Julian Anastasov Date: Tue, 29 Apr 2008 10:21:23 +0000 (-0700) Subject: ipvs: fix oops in backup for fwmark conn templates X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2ad17defd596ca7e8ba782d5fc6950ee0e99513c;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git ipvs: fix oops in backup for fwmark conn templates Fixes bug http://bugzilla.kernel.org/show_bug.cgi?id=10556 where conn templates with protocol=IPPROTO_IP can oops backup box. Result from ip_vs_proto_get() should be checked because protocol value can be invalid or unsupported in backup. But for valid message we should not fail for templates which use IPPROTO_IP. Also, add checks to validate message limits and connection state. Show state NONE for templates using IPPROTO_IP. Signed-off-by: Julian Anastasov Signed-off-by: David S. Miller --- diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h index 56f3c94ae620..9a51ebad3f1f 100644 --- a/include/net/ip_vs.h +++ b/include/net/ip_vs.h @@ -405,7 +405,8 @@ struct sk_buff; struct ip_vs_protocol { struct ip_vs_protocol *next; char *name; - __u16 protocol; + u16 protocol; + u16 num_states; int dont_defrag; atomic_t appcnt; /* counter of proto app incs */ int *timeout_table; /* protocol timeout table */ diff --git a/net/ipv4/ipvs/ip_vs_proto.c b/net/ipv4/ipvs/ip_vs_proto.c index dde28a250d92..4b1c16cbb16b 100644 --- a/net/ipv4/ipvs/ip_vs_proto.c +++ b/net/ipv4/ipvs/ip_vs_proto.c @@ -148,7 +148,7 @@ const char * ip_vs_state_name(__u16 proto, int state) struct ip_vs_protocol *pp = ip_vs_proto_get(proto); if (pp == NULL || pp->state_name == NULL) - return "ERR!"; + return (IPPROTO_IP == proto) ? "NONE" : "ERR!"; return pp->state_name(state); } diff --git a/net/ipv4/ipvs/ip_vs_proto_ah.c b/net/ipv4/ipvs/ip_vs_proto_ah.c index a842676e1c69..4bf835e1d86d 100644 --- a/net/ipv4/ipvs/ip_vs_proto_ah.c +++ b/net/ipv4/ipvs/ip_vs_proto_ah.c @@ -160,6 +160,7 @@ static void ah_exit(struct ip_vs_protocol *pp) struct ip_vs_protocol ip_vs_protocol_ah = { .name = "AH", .protocol = IPPROTO_AH, + .num_states = 1, .dont_defrag = 1, .init = ah_init, .exit = ah_exit, diff --git a/net/ipv4/ipvs/ip_vs_proto_esp.c b/net/ipv4/ipvs/ip_vs_proto_esp.c index aef0d3ee8e44..db6a6b7b1a0b 100644 --- a/net/ipv4/ipvs/ip_vs_proto_esp.c +++ b/net/ipv4/ipvs/ip_vs_proto_esp.c @@ -159,6 +159,7 @@ static void esp_exit(struct ip_vs_protocol *pp) struct ip_vs_protocol ip_vs_protocol_esp = { .name = "ESP", .protocol = IPPROTO_ESP, + .num_states = 1, .dont_defrag = 1, .init = esp_init, .exit = esp_exit, diff --git a/net/ipv4/ipvs/ip_vs_proto_tcp.c b/net/ipv4/ipvs/ip_vs_proto_tcp.c index 620e40ff79a9..b83dc14b0a4d 100644 --- a/net/ipv4/ipvs/ip_vs_proto_tcp.c +++ b/net/ipv4/ipvs/ip_vs_proto_tcp.c @@ -594,6 +594,7 @@ static void ip_vs_tcp_exit(struct ip_vs_protocol *pp) struct ip_vs_protocol ip_vs_protocol_tcp = { .name = "TCP", .protocol = IPPROTO_TCP, + .num_states = IP_VS_TCP_S_LAST, .dont_defrag = 0, .appcnt = ATOMIC_INIT(0), .init = ip_vs_tcp_init, diff --git a/net/ipv4/ipvs/ip_vs_proto_udp.c b/net/ipv4/ipvs/ip_vs_proto_udp.c index 1caa2908373f..75771cb3cd6f 100644 --- a/net/ipv4/ipvs/ip_vs_proto_udp.c +++ b/net/ipv4/ipvs/ip_vs_proto_udp.c @@ -409,6 +409,7 @@ static void udp_exit(struct ip_vs_protocol *pp) struct ip_vs_protocol ip_vs_protocol_udp = { .name = "UDP", .protocol = IPPROTO_UDP, + .num_states = IP_VS_UDP_S_LAST, .dont_defrag = 0, .init = udp_init, .exit = udp_exit, diff --git a/net/ipv4/ipvs/ip_vs_sync.c b/net/ipv4/ipvs/ip_vs_sync.c index 69c56663cc9a..eff54efe0351 100644 --- a/net/ipv4/ipvs/ip_vs_sync.c +++ b/net/ipv4/ipvs/ip_vs_sync.c @@ -288,11 +288,16 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen) char *p; int i; + if (buflen < sizeof(struct ip_vs_sync_mesg)) { + IP_VS_ERR_RL("sync message header too short\n"); + return; + } + /* Convert size back to host byte order */ m->size = ntohs(m->size); if (buflen != m->size) { - IP_VS_ERR("bogus message\n"); + IP_VS_ERR_RL("bogus sync message size\n"); return; } @@ -307,9 +312,48 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen) for (i=0; inr_conns; i++) { unsigned flags, state; - s = (struct ip_vs_sync_conn *)p; + if (p + SIMPLE_CONN_SIZE > buffer+buflen) { + IP_VS_ERR_RL("bogus conn in sync message\n"); + return; + } + s = (struct ip_vs_sync_conn *) p; flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC; + flags &= ~IP_VS_CONN_F_HASHED; + if (flags & IP_VS_CONN_F_SEQ_MASK) { + opt = (struct ip_vs_sync_conn_options *)&s[1]; + p += FULL_CONN_SIZE; + if (p > buffer+buflen) { + IP_VS_ERR_RL("bogus conn options in sync message\n"); + return; + } + } else { + opt = NULL; + p += SIMPLE_CONN_SIZE; + } + state = ntohs(s->state); + if (!(flags & IP_VS_CONN_F_TEMPLATE)) { + pp = ip_vs_proto_get(s->protocol); + if (!pp) { + IP_VS_ERR_RL("Unsupported protocol %u in sync msg\n", + s->protocol); + continue; + } + if (state >= pp->num_states) { + IP_VS_DBG(2, "Invalid %s state %u in sync msg\n", + pp->name, state); + continue; + } + } else { + /* protocol in templates is not used for state/timeout */ + pp = NULL; + if (state > 0) { + IP_VS_DBG(2, "Invalid template state %u in sync msg\n", + state); + state = 0; + } + } + if (!(flags & IP_VS_CONN_F_TEMPLATE)) cp = ip_vs_conn_in_get(s->protocol, s->caddr, s->cport, @@ -345,14 +389,9 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen) IP_VS_ERR("ip_vs_conn_new failed\n"); return; } - cp->state = state; } else if (!cp->dest) { dest = ip_vs_try_bind_dest(cp); - if (!dest) { - /* it is an unbound entry created by - * synchronization */ - cp->flags = flags | IP_VS_CONN_F_HASHED; - } else + if (dest) atomic_dec(&dest->refcnt); } else if ((cp->dest) && (cp->protocol == IPPROTO_TCP) && (cp->state != state)) { @@ -371,23 +410,22 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen) } } - if (flags & IP_VS_CONN_F_SEQ_MASK) { - opt = (struct ip_vs_sync_conn_options *)&s[1]; + if (opt) memcpy(&cp->in_seq, opt, sizeof(*opt)); - p += FULL_CONN_SIZE; - } else - p += SIMPLE_CONN_SIZE; - atomic_set(&cp->in_pkts, sysctl_ip_vs_sync_threshold[0]); cp->state = state; - pp = ip_vs_proto_get(s->protocol); - cp->timeout = pp->timeout_table[cp->state]; + cp->old_state = cp->state; + /* + * We can not recover the right timeout for templates + * in all cases, we can not find the right fwmark + * virtual service. If needed, we can do it for + * non-fwmark persistent services. + */ + if (!(flags & IP_VS_CONN_F_TEMPLATE) && pp->timeout_table) + cp->timeout = pp->timeout_table[state]; + else + cp->timeout = (3*60*HZ); ip_vs_conn_put(cp); - - if (p > buffer+buflen) { - IP_VS_ERR("bogus message\n"); - return; - } } }