From c246d942eabc3288f5d93930663411070093ac52 Mon Sep 17 00:00:00 2001 From: Karsten Graul Date: Fri, 16 Mar 2018 15:06:39 +0100 Subject: net/smc: restructure netinfo for CLC proposal msgs Introduce functions smc_clc_prfx_set to retrieve IP information for the CLC proposal msg and smc_clc_prfx_match to match the contents of a proposal message against the IP addresses of the net device. The new functions replace the functionality provided by smc_clc_netinfo_by_tcpsk, which is removed by this patch. The match functionality is extended to scan all ipv4 addresses of the net device for a match against the ipv4 subnet from the proposal msg. Signed-off-by: Karsten Graul Signed-off-by: Ursula Braun Signed-off-by: David S. Miller --- net/smc/smc_clc.c | 100 +++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 77 insertions(+), 23 deletions(-) (limited to 'net/smc/smc_clc.c') diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c index 874c5a75d6dd..dc3a2235978d 100644 --- a/net/smc/smc_clc.c +++ b/net/smc/smc_clc.c @@ -74,15 +74,35 @@ static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm) return true; } -/* determine subnet and mask of internal TCP socket */ -int smc_clc_netinfo_by_tcpsk(struct socket *clcsock, - __be32 *subnet, u8 *prefix_len) +/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ +static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, + struct smc_clc_msg_proposal_prefix *prop) +{ + struct in_device *in_dev = __in_dev_get_rcu(dst->dev); + + if (!in_dev) + return -ENODEV; + for_ifa(in_dev) { + if (!inet_ifa_match(ipv4, ifa)) + continue; + prop->prefix_len = inet_mask_len(ifa->ifa_mask); + prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; + /* prop->ipv6_prefixes_cnt = 0; already done by memset before */ + return 0; + } endfor_ifa(in_dev); + return -ENOENT; +} + +/* retrieve and set prefixes in CLC proposal msg */ +static int smc_clc_prfx_set(struct socket *clcsock, + struct smc_clc_msg_proposal_prefix *prop) { struct dst_entry *dst = sk_dst_get(clcsock->sk); - struct in_device *in_dev; - struct sockaddr_in addr; + struct sockaddr_storage addrs; + struct sockaddr_in *addr; int rc = -ENOENT; + memset(prop, 0, sizeof(*prop)); if (!dst) { rc = -ENOTCONN; goto out; @@ -91,22 +111,58 @@ int smc_clc_netinfo_by_tcpsk(struct socket *clcsock, rc = -ENODEV; goto out_rel; } - /* get address to which the internal TCP socket is bound */ - kernel_getsockname(clcsock, (struct sockaddr *)&addr); - /* analyze IPv4 specific data of net_device belonging to TCP socket */ + kernel_getsockname(clcsock, (struct sockaddr *)&addrs); + /* analyze IP specific data of net_device belonging to TCP socket */ rcu_read_lock(); - in_dev = __in_dev_get_rcu(dst->dev); + if (addrs.ss_family == PF_INET) { + /* IPv4 */ + addr = (struct sockaddr_in *)&addrs; + rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); + } + rcu_read_unlock(); +out_rel: + dst_release(dst); +out: + return rc; +} + +/* match ipv4 addrs of dev against addr in CLC proposal */ +static int smc_clc_prfx_match4_rcu(struct net_device *dev, + struct smc_clc_msg_proposal_prefix *prop) +{ + struct in_device *in_dev = __in_dev_get_rcu(dev); + + if (!in_dev) + return -ENODEV; for_ifa(in_dev) { - if (!inet_ifa_match(addr.sin_addr.s_addr, ifa)) - continue; - *prefix_len = inet_mask_len(ifa->ifa_mask); - *subnet = ifa->ifa_address & ifa->ifa_mask; - rc = 0; - break; + if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && + inet_ifa_match(prop->outgoing_subnet, ifa)) + return 0; } endfor_ifa(in_dev); - rcu_read_unlock(); + return -ENOENT; +} + +/* check if proposed prefixes match one of our device prefixes */ +int smc_clc_prfx_match(struct socket *clcsock, + struct smc_clc_msg_proposal_prefix *prop) +{ + struct dst_entry *dst = sk_dst_get(clcsock->sk); + int rc = -ENOENT; + + if (!dst) { + rc = -ENOTCONN; + goto out; + } + if (!dst->dev) { + rc = -ENODEV; + goto out_rel; + } + rcu_read_lock(); + if (!prop->ipv6_prefixes_cnt) + rc = smc_clc_prfx_match4_rcu(dst->dev, prop); + rcu_read_unlock(); out_rel: dst_release(dst); out: @@ -240,6 +296,11 @@ int smc_clc_send_proposal(struct smc_sock *smc, struct msghdr msg; int len, plen, rc; + /* retrieve ip prefixes for CLC proposal msg */ + rc = smc_clc_prfx_set(smc->clcsock, &pclc_prfx); + if (rc) + return SMC_CLC_DECL_CNFERR; /* configuration error */ + /* send SMC Proposal CLC message */ plen = sizeof(pclc) + sizeof(pclc_prfx) + sizeof(trl); memset(&pclc, 0, sizeof(pclc)); @@ -252,13 +313,6 @@ int smc_clc_send_proposal(struct smc_sock *smc, memcpy(&pclc.lcl.mac, &smcibdev->mac[ibport - 1], ETH_ALEN); pclc.iparea_offset = htons(0); - memset(&pclc_prfx, 0, sizeof(pclc_prfx)); - /* determine subnet and mask from internal TCP socket */ - rc = smc_clc_netinfo_by_tcpsk(smc->clcsock, &pclc_prfx.outgoing_subnet, - &pclc_prfx.prefix_len); - if (rc) - return SMC_CLC_DECL_CNFERR; /* configuration error */ - pclc_prfx.ipv6_prefixes_cnt = 0; memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); memset(&msg, 0, sizeof(msg)); vec[0].iov_base = &pclc; -- cgit v1.2.3