From 26c4f7da3e413da697a7beb22ad496390eda7da0 Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Tue, 10 Feb 2015 16:30:27 -0800 Subject: net: Fix remcsum in GRO path to not change packet Remote checksum offload processing is currently the same for both the GRO and non-GRO path. When the remote checksum offload option is encountered, the checksum field referred to is modified in the packet. So in the GRO case, the packet is modified in the GRO path and then the operation is skipped when the packet goes through the normal path based on skb->remcsum_offload. There is a problem in that the packet may be modified in the GRO path, but then forwarded off host still containing the remote checksum option. A remote host will again perform RCO but now the checksum verification will fail since GRO RCO already modified the checksum. To fix this, we ensure that GRO restores a packet to it's original state before returning. In this model, when GRO processes a remote checksum option it still changes the checksum per the algorithm but on return from lower layer processing the checksum is restored to its original value. In this patch we add define gro_remcsum structure which is passed to skb_gro_remcsum_process to save offset and delta for the checksum being changed. After lower layer processing, skb_gro_remcsum_cleanup is called to restore the checksum before returning from GRO. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- net/ipv4/fou.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c index 92ddea1e6457..7fa8d36e56d4 100644 --- a/net/ipv4/fou.c +++ b/net/ipv4/fou.c @@ -71,12 +71,6 @@ static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, size_t offset = ntohs(pd[1]); size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); - if (skb->remcsum_offload) { - /* Already processed in GRO path */ - skb->remcsum_offload = 0; - return guehdr; - } - if (!pskb_may_pull(skb, plen)) return NULL; guehdr = (struct guehdr *)&udp_hdr(skb)[1]; @@ -214,7 +208,8 @@ out_unlock: static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, struct guehdr *guehdr, void *data, - size_t hdrlen, u8 ipproto) + size_t hdrlen, u8 ipproto, + struct gro_remcsum *grc) { __be16 *pd = data; size_t start = ntohs(pd[0]); @@ -222,7 +217,7 @@ static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); if (skb->remcsum_offload) - return guehdr; + return NULL; if (!NAPI_GRO_CB(skb)->csum_valid) return NULL; @@ -234,7 +229,8 @@ static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, return NULL; } - skb_gro_remcsum_process(skb, (void *)guehdr + hdrlen, start, offset); + skb_gro_remcsum_process(skb, (void *)guehdr + hdrlen, + start, offset, grc); skb->remcsum_offload = 1; @@ -254,6 +250,9 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head, void *data; u16 doffset = 0; int flush = 1; + struct gro_remcsum grc; + + skb_gro_remcsum_init(&grc); off = skb_gro_offset(skb); len = off + sizeof(*guehdr); @@ -295,7 +294,7 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head, if (flags & GUE_PFLAG_REMCSUM) { guehdr = gue_gro_remcsum(skb, off, guehdr, data + doffset, hdrlen, - guehdr->proto_ctype); + guehdr->proto_ctype, &grc); if (!guehdr) goto out; @@ -345,6 +344,7 @@ out_unlock: rcu_read_unlock(); out: NAPI_GRO_CB(skb)->flush |= flush; + skb_gro_remcsum_cleanup(skb, &grc); return pp; } -- cgit v1.2.3-70-g09d2 From 6db93ea13b7937c0523ea1f977b322f1347a5633 Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Tue, 10 Feb 2015 16:30:29 -0800 Subject: udp: Set SKB_GSO_UDP_TUNNEL* in UDP GRO path Properly set GSO types and skb->encapsulation in the UDP tunnel GRO complete so that packets are properly represented for GSO. This sets SKB_GSO_UDP_TUNNEL or SKB_GSO_UDP_TUNNEL_CSUM depending on whether non-zero checksums were received, and sets SKB_GSO_TUNNEL_REMCSUM if the remote checksum option was processed. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- net/ipv4/udp_offload.c | 13 ++++++++++++- net/ipv6/udp_offload.c | 6 +++++- 2 files changed, 17 insertions(+), 2 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index d10f6f4ead27..4915d8284a86 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -402,6 +402,13 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff) } rcu_read_unlock(); + + if (skb->remcsum_offload) + skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM; + + skb->encapsulation = 1; + skb_set_inner_mac_header(skb, nhoff + sizeof(struct udphdr)); + return err; } @@ -410,9 +417,13 @@ static int udp4_gro_complete(struct sk_buff *skb, int nhoff) const struct iphdr *iph = ip_hdr(skb); struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); - if (uh->check) + if (uh->check) { + skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr, iph->daddr, 0); + } else { + skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; + } return udp_gro_complete(skb, nhoff); } diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c index a56276996b72..ab889bb16b3c 100644 --- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -161,9 +161,13 @@ static int udp6_gro_complete(struct sk_buff *skb, int nhoff) const struct ipv6hdr *ipv6h = ipv6_hdr(skb); struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); - if (uh->check) + if (uh->check) { + skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr, &ipv6h->daddr, 0); + } else { + skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; + } return udp_gro_complete(skb, nhoff); } -- cgit v1.2.3-70-g09d2 From 15e2396d4e3ce23188852b74d924107982c63b42 Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Tue, 10 Feb 2015 16:30:31 -0800 Subject: net: Infrastructure for CHECKSUM_PARTIAL with remote checsum offload This patch adds infrastructure so that remote checksum offload can set CHECKSUM_PARTIAL instead of calling csum_partial and writing the modfied checksum field. Add skb_remcsum_adjust_partial function to set an skb for using CHECKSUM_PARTIAL with remote checksum offload. Changed skb_remcsum_process and skb_gro_remcsum_process to take a boolean argument to indicate if checksum partial can be set or the checksum needs to be modified using the normal algorithm. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- drivers/net/vxlan.c | 4 ++-- include/linux/netdevice.h | 19 ++++++++++++++++++- include/linux/skbuff.h | 15 ++++++++++++++- net/core/dev.c | 1 + net/ipv4/fou.c | 4 ++-- 5 files changed, 37 insertions(+), 6 deletions(-) (limited to 'net/ipv4') diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 30310a63475a..4f04443cfd33 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -580,7 +580,7 @@ static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, } skb_gro_remcsum_process(skb, (void *)vh + hdrlen, - start, offset, grc); + start, offset, grc, true); skb->remcsum_offload = 1; @@ -1171,7 +1171,7 @@ static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh, vh = (struct vxlanhdr *)(udp_hdr(skb) + 1); - skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset); + skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset, true); return vh; } diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 43fd0a4dcd04..5897b4ea5a3f 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1923,6 +1923,9 @@ struct napi_gro_cb { /* Number of segments aggregated. */ u16 count; + /* Start offset for remote checksum offload */ + u16 gro_remcsum_start; + /* jiffies when first packet was created/queued */ unsigned long age; @@ -2244,6 +2247,12 @@ static inline void skb_gro_postpull_rcsum(struct sk_buff *skb, __sum16 __skb_gro_checksum_complete(struct sk_buff *skb); +static inline bool skb_at_gro_remcsum_start(struct sk_buff *skb) +{ + return (NAPI_GRO_CB(skb)->gro_remcsum_start - skb_headroom(skb) == + skb_gro_offset(skb)); +} + static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb, bool zero_okay, __sum16 check) @@ -2251,6 +2260,7 @@ static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb, return ((skb->ip_summed != CHECKSUM_PARTIAL || skb_checksum_start_offset(skb) < skb_gro_offset(skb)) && + !skb_at_gro_remcsum_start(skb) && NAPI_GRO_CB(skb)->csum_cnt == 0 && (!zero_okay || check)); } @@ -2337,12 +2347,19 @@ static inline void skb_gro_remcsum_init(struct gro_remcsum *grc) static inline void skb_gro_remcsum_process(struct sk_buff *skb, void *ptr, int start, int offset, - struct gro_remcsum *grc) + struct gro_remcsum *grc, + bool nopartial) { __wsum delta; BUG_ON(!NAPI_GRO_CB(skb)->csum_valid); + if (!nopartial) { + NAPI_GRO_CB(skb)->gro_remcsum_start = + ((unsigned char *)ptr + start) - skb->head; + return; + } + delta = remcsum_adjust(ptr, NAPI_GRO_CB(skb)->csum, start, offset); /* Adjust skb->csum since we changed the packet */ diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index da6028a50687..30007afe70b3 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -3104,16 +3104,29 @@ do { \ compute_pseudo(skb, proto)); \ } while (0) +static inline void skb_remcsum_adjust_partial(struct sk_buff *skb, void *ptr, + u16 start, u16 offset) +{ + skb->ip_summed = CHECKSUM_PARTIAL; + skb->csum_start = ((unsigned char *)ptr + start) - skb->head; + skb->csum_offset = offset - start; +} + /* Update skbuf and packet to reflect the remote checksum offload operation. * When called, ptr indicates the starting point for skb->csum when * ip_summed is CHECKSUM_COMPLETE. If we need create checksum complete * here, skb_postpull_rcsum is done so skb->csum start is ptr. */ static inline void skb_remcsum_process(struct sk_buff *skb, void *ptr, - int start, int offset) + int start, int offset, bool nopartial) { __wsum delta; + if (!nopartial) { + skb_remcsum_adjust_partial(skb, ptr, start, offset); + return; + } + if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) { __skb_checksum_complete(skb); skb_postpull_rcsum(skb, skb->data, ptr - (void *)skb->data); diff --git a/net/core/dev.c b/net/core/dev.c index d030575532a2..48c6ecb18f3c 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4024,6 +4024,7 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff NAPI_GRO_CB(skb)->flush = 0; NAPI_GRO_CB(skb)->free = 0; NAPI_GRO_CB(skb)->udp_mark = 0; + NAPI_GRO_CB(skb)->gro_remcsum_start = 0; /* Setup for GRO checksum validation */ switch (skb->ip_summed) { diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c index 7fa8d36e56d4..d320f575cc62 100644 --- a/net/ipv4/fou.c +++ b/net/ipv4/fou.c @@ -75,7 +75,7 @@ static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, return NULL; guehdr = (struct guehdr *)&udp_hdr(skb)[1]; - skb_remcsum_process(skb, (void *)guehdr + hdrlen, start, offset); + skb_remcsum_process(skb, (void *)guehdr + hdrlen, start, offset, true); return guehdr; } @@ -230,7 +230,7 @@ static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, } skb_gro_remcsum_process(skb, (void *)guehdr + hdrlen, - start, offset, grc); + start, offset, grc, true); skb->remcsum_offload = 1; -- cgit v1.2.3-70-g09d2 From fe881ef11cf0220f118816181930494d484c4883 Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Tue, 10 Feb 2015 16:30:33 -0800 Subject: gue: Use checksum partial with remote checksum offload Change remote checksum handling to set checksum partial as default behavior. Added an iflink parameter to configure not using checksum partial (calling csum_partial to update checksum). Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- include/uapi/linux/fou.h | 1 + net/ipv4/fou.c | 28 ++++++++++++++++++++++------ 2 files changed, 23 insertions(+), 6 deletions(-) (limited to 'net/ipv4') diff --git a/include/uapi/linux/fou.h b/include/uapi/linux/fou.h index 8df06894da23..c303588bb767 100644 --- a/include/uapi/linux/fou.h +++ b/include/uapi/linux/fou.h @@ -14,6 +14,7 @@ enum { FOU_ATTR_AF, /* u8 */ FOU_ATTR_IPPROTO, /* u8 */ FOU_ATTR_TYPE, /* u8 */ + FOU_ATTR_REMCSUM_NOPARTIAL, /* flag */ __FOU_ATTR_MAX, }; diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c index d320f575cc62..ff069f6597ac 100644 --- a/net/ipv4/fou.c +++ b/net/ipv4/fou.c @@ -22,14 +22,18 @@ static LIST_HEAD(fou_list); struct fou { struct socket *sock; u8 protocol; + u8 flags; u16 port; struct udp_offload udp_offloads; struct list_head list; }; +#define FOU_F_REMCSUM_NOPARTIAL BIT(0) + struct fou_cfg { u16 type; u8 protocol; + u8 flags; struct udp_port_cfg udp_config; }; @@ -64,7 +68,8 @@ static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) } static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, - void *data, size_t hdrlen, u8 ipproto) + void *data, size_t hdrlen, u8 ipproto, + bool nopartial) { __be16 *pd = data; size_t start = ntohs(pd[0]); @@ -75,7 +80,8 @@ static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr, return NULL; guehdr = (struct guehdr *)&udp_hdr(skb)[1]; - skb_remcsum_process(skb, (void *)guehdr + hdrlen, start, offset, true); + skb_remcsum_process(skb, (void *)guehdr + hdrlen, + start, offset, nopartial); return guehdr; } @@ -136,7 +142,9 @@ static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) if (flags & GUE_PFLAG_REMCSUM) { guehdr = gue_remcsum(skb, guehdr, data + doffset, - hdrlen, guehdr->proto_ctype); + hdrlen, guehdr->proto_ctype, + !!(fou->flags & + FOU_F_REMCSUM_NOPARTIAL)); if (!guehdr) goto drop; @@ -209,7 +217,7 @@ out_unlock: static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, struct guehdr *guehdr, void *data, size_t hdrlen, u8 ipproto, - struct gro_remcsum *grc) + struct gro_remcsum *grc, bool nopartial) { __be16 *pd = data; size_t start = ntohs(pd[0]); @@ -230,7 +238,7 @@ static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, } skb_gro_remcsum_process(skb, (void *)guehdr + hdrlen, - start, offset, grc, true); + start, offset, grc, nopartial); skb->remcsum_offload = 1; @@ -250,6 +258,7 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head, void *data; u16 doffset = 0; int flush = 1; + struct fou *fou = container_of(uoff, struct fou, udp_offloads); struct gro_remcsum grc; skb_gro_remcsum_init(&grc); @@ -294,7 +303,9 @@ static struct sk_buff **gue_gro_receive(struct sk_buff **head, if (flags & GUE_PFLAG_REMCSUM) { guehdr = gue_gro_remcsum(skb, off, guehdr, data + doffset, hdrlen, - guehdr->proto_ctype, &grc); + guehdr->proto_ctype, &grc, + !!(fou->flags & + FOU_F_REMCSUM_NOPARTIAL)); if (!guehdr) goto out; @@ -455,6 +466,7 @@ static int fou_create(struct net *net, struct fou_cfg *cfg, sk = sock->sk; + fou->flags = cfg->flags; fou->port = cfg->udp_config.local_udp_port; /* Initial for fou type */ @@ -541,6 +553,7 @@ static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = { [FOU_ATTR_AF] = { .type = NLA_U8, }, [FOU_ATTR_IPPROTO] = { .type = NLA_U8, }, [FOU_ATTR_TYPE] = { .type = NLA_U8, }, + [FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, }, }; static int parse_nl_config(struct genl_info *info, @@ -571,6 +584,9 @@ static int parse_nl_config(struct genl_info *info, if (info->attrs[FOU_ATTR_TYPE]) cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); + if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL]) + cfg->flags |= FOU_F_REMCSUM_NOPARTIAL; + return 0; } -- cgit v1.2.3-70-g09d2 From ba34e6d9d346fe4e05d7e417b9edf5140772d34c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 13 Feb 2015 04:47:12 -0800 Subject: tcp: make sure skb is not shared before using skb_get() IPv6 can keep a copy of SYN message using skb_get() in tcp_v6_conn_request() so that caller wont free the skb when calling kfree_skb() later. Therefore TCP fast open has to clone the skb it is queuing in child->sk_receive_queue, as all skbs consumed from receive_queue are freed using __kfree_skb() (ie assuming skb->users == 1) Signed-off-by: Eric Dumazet Signed-off-by: Yuchung Cheng Fixes: 5b7ed0892f2af ("tcp: move fastopen functions to tcp_fastopen.c") Signed-off-by: David S. Miller --- net/ipv4/tcp_fastopen.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c index 53db2c309572..ea82fd492c1b 100644 --- a/net/ipv4/tcp_fastopen.c +++ b/net/ipv4/tcp_fastopen.c @@ -134,6 +134,7 @@ static bool tcp_fastopen_create_child(struct sock *sk, struct tcp_sock *tp; struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; struct sock *child; + u32 end_seq; req->num_retrans = 0; req->num_timeout = 0; @@ -185,20 +186,35 @@ static bool tcp_fastopen_create_child(struct sock *sk, /* Queue the data carried in the SYN packet. We need to first * bump skb's refcnt because the caller will attempt to free it. + * Note that IPv6 might also have used skb_get() trick + * in tcp_v6_conn_request() to keep this SYN around (treq->pktopts) + * So we need to eventually get a clone of the packet, + * before inserting it in sk_receive_queue. * * XXX (TFO) - we honor a zero-payload TFO request for now, * (any reason not to?) but no need to queue the skb since * there is no data. How about SYN+FIN? */ - if (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq + 1) { - skb = skb_get(skb); - skb_dst_drop(skb); - __skb_pull(skb, tcp_hdr(skb)->doff * 4); - skb_set_owner_r(skb, child); - __skb_queue_tail(&child->sk_receive_queue, skb); - tp->syn_data_acked = 1; + end_seq = TCP_SKB_CB(skb)->end_seq; + if (end_seq != TCP_SKB_CB(skb)->seq + 1) { + struct sk_buff *skb2; + + if (unlikely(skb_shared(skb))) + skb2 = skb_clone(skb, GFP_ATOMIC); + else + skb2 = skb_get(skb); + + if (likely(skb2)) { + skb_dst_drop(skb2); + __skb_pull(skb2, tcp_hdrlen(skb)); + skb_set_owner_r(skb2, child); + __skb_queue_tail(&child->sk_receive_queue, skb2); + tp->syn_data_acked = 1; + } else { + end_seq = TCP_SKB_CB(skb)->seq + 1; + } } - tcp_rsk(req)->rcv_nxt = tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq; + tcp_rsk(req)->rcv_nxt = tp->rcv_nxt = end_seq; sk->sk_data_ready(sk); bh_unlock_sock(child); sock_put(child); -- cgit v1.2.3-70-g09d2 From ca9f1fd263e14765a4c213e46940876ad78fce28 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Sat, 14 Feb 2015 13:47:54 -0500 Subject: net: spelling fixes Spelling errors caught by codespell. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/core/filter.c | 2 +- net/core/pktgen.c | 2 +- net/ipv4/devinet.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) (limited to 'net/ipv4') diff --git a/net/core/filter.c b/net/core/filter.c index ec9baea10c16..f6bdc2b1ba01 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -531,7 +531,7 @@ do_pass: *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); break; - /* Unkown instruction. */ + /* Unknown instruction. */ default: goto err; } diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 9fa25b0ea145..b4899f5b7388 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -97,7 +97,7 @@ * New xmit() return, do_div and misc clean up by Stephen Hemminger * 040923 * - * Randy Dunlap fixed u64 printk compiler waring + * Randy Dunlap fixed u64 printk compiler warning * * Remove FCS from BW calculation. Lennert Buytenhek * New time handling. Lennert Buytenhek 041213 diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index f0b4a31d7bd6..3a8985c94581 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -1186,7 +1186,7 @@ __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) no_in_dev: /* Not loopback addresses on loopback should be preferred - in this case. It is importnat that lo is the first interface + in this case. It is important that lo is the first interface in dev_base list. */ for_each_netdev_rcu(net, dev) { -- cgit v1.2.3-70-g09d2